/*

  * MOV, 3GP, MP4 muxer

  * Copyright (c) 2003 Thomas Raivio
  * Copyright (c) 2004 Gildas Bazin <gbazin at videolan dot org>

  * Copyright (c) 2009 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 #include "movenc.h"

 #include "avformat.h"

 #include "avio_internal.h"

 #include "riff.h"

 #include "avio.h"

 #include "isom.h"

 #include "avc.h"

 #include "libavcodec/get_bits.h"

 #include "libavcodec/put_bits.h"

 #include "libavcodec/vc1.h"

 #include "internal.h"
 #include "libavutil/avstring.h"

 #include "libavutil/intfloat.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/opt.h"

 #include "libavutil/dict.h"

 #include "rtpenc.h"

 #include "mov_chan.h"

 #undef NDEBUG
 #include <assert.h>
 

 static const AVOption options[] = {

     { "movflags", "MOV muxer flags", offsetof(MOVMuxContext, flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },

     { "rtphint", "Add RTP hint tracks", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_RTP_HINT}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },

     { "moov_size", "maximum moov size so it can be placed at the begin", offsetof(MOVMuxContext, reserved_moov_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, 0 },

     { "empty_moov", "Make the initial moov atom empty (not supported by QuickTime)", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_EMPTY_MOOV}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "frag_keyframe", "Fragment at video keyframes", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FRAG_KEYFRAME}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "separate_moof", "Write separate moof/mdat atoms for each track", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_SEPARATE_MOOF}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "frag_custom", "Flush fragments on caller requests", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FRAG_CUSTOM}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },
     { "isml", "Create a live smooth streaming feed (for pushing to a publishing point)", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_ISML}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },

     { "faststart", "Run a second pass to put the moov at the beginning of the file", 0, AV_OPT_TYPE_CONST, {.i64 = FF_MOV_FLAG_FASTSTART}, INT_MIN, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "movflags" },

     FF_RTP_FLAG_OPTS(MOVMuxContext, rtp_flags),

     { "skip_iods", "Skip writing iods atom.", offsetof(MOVMuxContext, iods_skip), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM},

     { "iods_audio_profile", "iods audio profile atom.", offsetof(MOVMuxContext, iods_audio_profile), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
     { "iods_video_profile", "iods video profile atom.", offsetof(MOVMuxContext, iods_video_profile), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 255, AV_OPT_FLAG_ENCODING_PARAM},
     { "frag_duration", "Maximum fragment duration", offsetof(MOVMuxContext, max_fragment_duration), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
     { "min_frag_duration", "Minimum fragment duration", offsetof(MOVMuxContext, min_fragment_duration), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
     { "frag_size", "Maximum fragment size", offsetof(MOVMuxContext, max_fragment_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},
     { "ism_lookahead", "Number of lookahead entries for ISM files", offsetof(MOVMuxContext, ism_lookahead), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM},

     { "use_editlist", "use edit list", offsetof(MOVMuxContext, use_editlist), AV_OPT_TYPE_INT, {.i64 = -1}, -1, 1, AV_OPT_FLAG_ENCODING_PARAM},

     { NULL },
 };
 

 #define MOV_CLASS(flavor)\
 static const AVClass flavor ## _muxer_class = {\
     .class_name = #flavor " muxer",\
     .item_name  = av_default_item_name,\
     .option     = options,\
     .version    = LIBAVUTIL_VERSION_INT,\

 };
 

 //FIXME support 64 bit variant with wide placeholders

 static int64_t update_size(AVIOContext *pb, int64_t pos)

 {

     int64_t curpos = avio_tell(pb);

     avio_seek(pb, pos, SEEK_SET);

     avio_wb32(pb, curpos - pos); /* rewrite size */

     avio_seek(pb, curpos, SEEK_SET);

 
     return curpos - pos;

 }
 

 static int supports_edts(MOVMuxContext *mov)
 {
     // EDTS with fragments is tricky as we dont know the duration when its written
     return (mov->use_editlist<0 && !(mov->flags & FF_MOV_FLAG_FRAGMENT)) || mov->use_editlist>0;
 }
 

 static int is_co64_required(const MOVTrack *track)
 {
     int i;
 
     for (i = 0; i < track->entry; i++) {
         if (!track->cluster[i].chunkNum)
             continue;
         if (track->cluster[i].pos + track->data_offset > UINT32_MAX)
             return 1;
     }
     return 0;
 }
 

 /* Chunk offset atom */

 static int mov_write_stco_tag(AVIOContext *pb, MOVTrack *track)

 {
     int i;

     int mode64 = is_co64_required(track); // use 32 bit size variant if possible

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     if (mode64)

         ffio_wfourcc(pb, "co64");

     else

         ffio_wfourcc(pb, "stco");

     avio_wb32(pb, 0); /* version & flags */

     avio_wb32(pb, track->chunkCount); /* entry count */

     for (i=0; i<track->entry; i++) {

         if(!track->cluster[i].chunkNum)
             continue;

         if(mode64 == 1)

             avio_wb64(pb, track->cluster[i].pos + track->data_offset);

         else

             avio_wb32(pb, track->cluster[i].pos + track->data_offset);

     }

     return update_size(pb, pos);

 }
 

 /* Sample size atom */

 static int mov_write_stsz_tag(AVIOContext *pb, MOVTrack *track)

 {

     int equalChunks = 1;

     int i, j, entries = 0, tst = -1, oldtst = -1;

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "stsz");

     avio_wb32(pb, 0); /* version & flags */

     for (i=0; i<track->entry; i++) {

         tst = track->cluster[i].size/track->cluster[i].entries;

         if(oldtst != -1 && tst != oldtst) {
             equalChunks = 0;

         }
         oldtst = tst;

         entries += track->cluster[i].entries;

     }

     if (equalChunks && track->entry) {
         int sSize = track->entry ? track->cluster[0].size/track->cluster[0].entries : 0;

         sSize = FFMAX(1, sSize); // adpcm mono case could make sSize == 0

         avio_wb32(pb, sSize); // sample size
         avio_wb32(pb, entries); // sample count

     }

     else {

         avio_wb32(pb, 0); // sample size
         avio_wb32(pb, entries); // sample count

         for (i=0; i<track->entry; i++) {

             for (j=0; j<track->cluster[i].entries; j++) {

                 avio_wb32(pb, track->cluster[i].size /

                          track->cluster[i].entries);

             }

         }
     }

     return update_size(pb, pos);

 }
 

 /* Sample to chunk atom */

 static int mov_write_stsc_tag(AVIOContext *pb, MOVTrack *track)

 {

     int index = 0, oldval = -1, i;

     int64_t entryPos, curpos;

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "stsc");

     avio_wb32(pb, 0); // version & flags

     entryPos = avio_tell(pb);

     avio_wb32(pb, track->chunkCount); // entry count

     for (i=0; i<track->entry; i++) {

         if (oldval != track->cluster[i].samples_in_chunk && track->cluster[i].chunkNum)

         {

             avio_wb32(pb, track->cluster[i].chunkNum); // first chunk

             avio_wb32(pb, track->cluster[i].samples_in_chunk); // samples per chunk

             avio_wb32(pb, 0x1); // sample description index

             oldval = track->cluster[i].samples_in_chunk;

             index++;

         }
     }

     curpos = avio_tell(pb);

     avio_seek(pb, entryPos, SEEK_SET);

     avio_wb32(pb, index); // rewrite size

     avio_seek(pb, curpos, SEEK_SET);

     return update_size(pb, pos);

 }
 

 /* Sync sample atom */

 static int mov_write_stss_tag(AVIOContext *pb, MOVTrack *track, uint32_t flag)

 {

     int64_t curpos, entryPos;

     int i, index = 0;

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); // size

     ffio_wfourcc(pb, flag == MOV_SYNC_SAMPLE ? "stss" : "stps");

     avio_wb32(pb, 0); // version & flags

     entryPos = avio_tell(pb);

     avio_wb32(pb, track->entry); // entry count

     for (i=0; i<track->entry; i++) {

         if (track->cluster[i].flags & flag) {

             avio_wb32(pb, i+1);

             index++;
         }
     }

     curpos = avio_tell(pb);

     avio_seek(pb, entryPos, SEEK_SET);

     avio_wb32(pb, index); // rewrite size

     avio_seek(pb, curpos, SEEK_SET);

     return update_size(pb, pos);

 }
 

 static int mov_write_amr_tag(AVIOContext *pb, MOVTrack *track)

 {

     avio_wb32(pb, 0x11); /* size */

     if (track->mode == MODE_MOV) ffio_wfourcc(pb, "samr");
     else                         ffio_wfourcc(pb, "damr");
     ffio_wfourcc(pb, "FFMP");

     avio_w8(pb, 0); /* decoder version */

     avio_wb16(pb, 0x81FF); /* Mode set (all modes for AMR_NB) */
     avio_w8(pb, 0x00); /* Mode change period (no restriction) */
     avio_w8(pb, 0x01); /* Frames per sample */

     return 0x11;
 }
 

 static int mov_write_ac3_tag(AVIOContext *pb, MOVTrack *track)

 {
     GetBitContext gbc;
     PutBitContext pbc;
     uint8_t buf[3];
     int fscod, bsid, bsmod, acmod, lfeon, frmsizecod;
 

     if (track->vos_len < 7)

         return -1;
 

     avio_wb32(pb, 11);

     ffio_wfourcc(pb, "dac3");

     init_get_bits(&gbc, track->vos_data + 4, (track->vos_len - 4) * 8);

     fscod      = get_bits(&gbc, 2);
     frmsizecod = get_bits(&gbc, 6);
     bsid       = get_bits(&gbc, 5);
     bsmod      = get_bits(&gbc, 3);
     acmod      = get_bits(&gbc, 3);
     if (acmod == 2) {
         skip_bits(&gbc, 2); // dsurmod
     } else {
         if ((acmod & 1) && acmod != 1)
             skip_bits(&gbc, 2); // cmixlev
         if (acmod & 4)
             skip_bits(&gbc, 2); // surmixlev
     }
     lfeon = get_bits1(&gbc);
 
     init_put_bits(&pbc, buf, sizeof(buf));
     put_bits(&pbc, 2, fscod);
     put_bits(&pbc, 5, bsid);
     put_bits(&pbc, 3, bsmod);
     put_bits(&pbc, 3, acmod);
     put_bits(&pbc, 1, lfeon);
     put_bits(&pbc, 5, frmsizecod>>1); // bit_rate_code
     put_bits(&pbc, 5, 0); // reserved
 
     flush_put_bits(&pbc);

     avio_write(pb, buf, sizeof(buf));

 
     return 11;
 }
 

 /**
  * This function writes extradata "as is".

  * Extradata must be formatted like a valid atom (with size and tag).

  */

 static int mov_write_extradata_tag(AVIOContext *pb, MOVTrack *track)

 {

     avio_write(pb, track->enc->extradata, track->enc->extradata_size);

     return track->enc->extradata_size;
 }
 

 static int mov_write_enda_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 10);

     ffio_wfourcc(pb, "enda");

     avio_wb16(pb, 1); /* little endian */

     return 10;
 }
 

 static int mov_write_enda_tag_be(AVIOContext *pb)
 {
   avio_wb32(pb, 10);
   ffio_wfourcc(pb, "enda");
   avio_wb16(pb, 0); /* big endian */
   return 10;
 }
 

 static void put_descr(AVIOContext *pb, int tag, unsigned int size)

 {

     int i = 3;

     avio_w8(pb, tag);

     for(; i>0; i--)

         avio_w8(pb, (size>>(7*i)) | 0x80);
     avio_w8(pb, size & 0x7F);

 }
 

 static unsigned compute_avg_bitrate(MOVTrack *track)
 {
     uint64_t size = 0;
     int i;

     if (!track->track_duration)
         return 0;

     for (i = 0; i < track->entry; i++)
         size += track->cluster[i].size;

     return size * 8 * track->timescale / track->track_duration;

 }
 

 static int mov_write_esds_tag(AVIOContext *pb, MOVTrack *track) // Basic

 {

     int64_t pos = avio_tell(pb);

     int decoder_specific_info_len = track->vos_len ? 5 + track->vos_len : 0;

     unsigned avg_bitrate;

     avio_wb32(pb, 0); // size

     ffio_wfourcc(pb, "esds");

     avio_wb32(pb, 0); // Version

 
     // ES descriptor

     put_descr(pb, 0x03, 3 + 5+13 + decoder_specific_info_len + 5+1);
     avio_wb16(pb, track->track_id);

     avio_w8(pb, 0x00); // flags (= no flags)

 
     // DecoderConfig descriptor

     put_descr(pb, 0x04, 13 + decoder_specific_info_len);

 
     // Object type indication

     if ((track->enc->codec_id == AV_CODEC_ID_MP2 ||
          track->enc->codec_id == AV_CODEC_ID_MP3) &&

         track->enc->sample_rate > 24000)

         avio_w8(pb, 0x6B); // 11172-3

     else

         avio_w8(pb, ff_codec_get_tag(ff_mp4_obj_type, track->enc->codec_id));

 
     // the following fields is made of 6 bits to identify the streamtype (4 for video, 5 for audio)
     // plus 1 bit to indicate upstream and 1 bit set to 1 (reserved)

     if(track->enc->codec_type == AVMEDIA_TYPE_AUDIO)

         avio_w8(pb, 0x15); // flags (= Audiostream)

     else

         avio_w8(pb, 0x11); // flags (= Visualstream)

     avio_w8(pb,  track->enc->rc_buffer_size>>(3+16));      // Buffersize DB (24 bits)
     avio_wb16(pb, (track->enc->rc_buffer_size>>3)&0xFFFF); // Buffersize DB

     avg_bitrate = compute_avg_bitrate(track);
     // maxbitrate (FIXME should be max rate in any 1 sec window)
     avio_wb32(pb, FFMAX3(track->enc->bit_rate, track->enc->rc_max_rate, avg_bitrate));
     avio_wb32(pb, avg_bitrate);

     if (track->vos_len) {

         // DecoderSpecific info descriptor

         put_descr(pb, 0x05, track->vos_len);
         avio_write(pb, track->vos_data, track->vos_len);

     }
 
     // SL descriptor

     put_descr(pb, 0x06, 1);

     avio_w8(pb, 0x02);

     return update_size(pb, pos);

 }
 

 static int mov_pcm_le_gt16(enum AVCodecID codec_id)

 {

     return codec_id == AV_CODEC_ID_PCM_S24LE ||
            codec_id == AV_CODEC_ID_PCM_S32LE ||
            codec_id == AV_CODEC_ID_PCM_F32LE ||
            codec_id == AV_CODEC_ID_PCM_F64LE;

 }
 

 static int mov_pcm_be_gt16(enum AVCodecID codec_id)
 {
     return codec_id == AV_CODEC_ID_PCM_S24BE ||
            codec_id == AV_CODEC_ID_PCM_S32BE ||
            codec_id == AV_CODEC_ID_PCM_F32BE ||
            codec_id == AV_CODEC_ID_PCM_F64BE;
 }
 

 static int mov_write_ms_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0);
     avio_wl32(pb, track->tag); // store it byteswapped

     track->enc->codec_tag = av_bswap16(track->tag >> 16);

     ff_put_wav_header(pb, track->enc);

     return update_size(pb, pos);

 }
 

 static int mov_write_wfex_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);
     avio_wb32(pb, 0);
     ffio_wfourcc(pb, "wfex");
     ff_put_wav_header(pb, track->enc);
     return update_size(pb, pos);
 }
 

 static int mov_write_chan_tag(AVIOContext *pb, MOVTrack *track)
 {
     uint32_t layout_tag, bitmap;
     int64_t pos = avio_tell(pb);
 
     layout_tag = ff_mov_get_channel_layout_tag(track->enc->codec_id,
                                                track->enc->channel_layout,
                                                &bitmap);
     if (!layout_tag) {
         av_log(track->enc, AV_LOG_WARNING, "not writing 'chan' tag due to "
                "lack of channel information\n");
         return 0;
     }
 
     avio_wb32(pb, 0);           // Size
     ffio_wfourcc(pb, "chan");   // Type
     avio_w8(pb, 0);             // Version
     avio_wb24(pb, 0);           // Flags
     avio_wb32(pb, layout_tag);  // mChannelLayoutTag
     avio_wb32(pb, bitmap);      // mChannelBitmap
     avio_wb32(pb, 0);           // mNumberChannelDescriptions
 

     return update_size(pb, pos);

 }
 

 static int mov_write_wave_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0);     /* size */

     ffio_wfourcc(pb, "wave");

     if (track->enc->codec_id != AV_CODEC_ID_QDM2) {

     avio_wb32(pb, 12);    /* size */

     ffio_wfourcc(pb, "frma");

     avio_wl32(pb, track->tag);

     }

     if (track->enc->codec_id == AV_CODEC_ID_AAC) {

         /* useless atom needed by mplayer, ipod, not needed by quicktime */

         avio_wb32(pb, 12); /* size */

         ffio_wfourcc(pb, "mp4a");

         avio_wb32(pb, 0);

         mov_write_esds_tag(pb, track);

     } else if (mov_pcm_le_gt16(track->enc->codec_id))  {
       mov_write_enda_tag(pb);
     } else if (mov_pcm_be_gt16(track->enc->codec_id))  {
       mov_write_enda_tag_be(pb);

     } else if (track->enc->codec_id == AV_CODEC_ID_AMR_NB) {

         mov_write_amr_tag(pb, track);

     } else if (track->enc->codec_id == AV_CODEC_ID_AC3) {

         mov_write_ac3_tag(pb, track);

     } else if (track->enc->codec_id == AV_CODEC_ID_ALAC ||
                track->enc->codec_id == AV_CODEC_ID_QDM2) {

         mov_write_extradata_tag(pb, track);

     } else if (track->enc->codec_id == AV_CODEC_ID_ADPCM_MS ||
                track->enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {

         mov_write_ms_tag(pb, track);

     }

     avio_wb32(pb, 8);     /* size */
     avio_wb32(pb, 0);     /* null tag */

     return update_size(pb, pos);

 }
 

 static int mov_write_dvc1_structs(MOVTrack *track, uint8_t *buf)
 {
     uint8_t *unescaped;
     const uint8_t *start, *next, *end = track->vos_data + track->vos_len;
     int unescaped_size, seq_found = 0;
     int level = 0, interlace = 0;
     int packet_seq   = track->vc1_info.packet_seq;
     int packet_entry = track->vc1_info.packet_entry;
     int slices       = track->vc1_info.slices;
     PutBitContext pbc;
 
     if (track->start_dts == AV_NOPTS_VALUE) {
         /* No packets written yet, vc1_info isn't authoritative yet. */
         /* Assume inline sequence and entry headers. This will be
          * overwritten at the end if the file is seekable. */
         packet_seq = packet_entry = 1;
     }
 
     unescaped = av_mallocz(track->vos_len + FF_INPUT_BUFFER_PADDING_SIZE);
     if (!unescaped)
         return AVERROR(ENOMEM);
     start = find_next_marker(track->vos_data, end);
     for (next = start; next < end; start = next) {
         GetBitContext gb;
         int size;
         next = find_next_marker(start + 4, end);
         size = next - start - 4;
         if (size <= 0)
             continue;
         unescaped_size = vc1_unescape_buffer(start + 4, size, unescaped);
         init_get_bits(&gb, unescaped, 8 * unescaped_size);
         if (AV_RB32(start) == VC1_CODE_SEQHDR) {
             int profile = get_bits(&gb, 2);
             if (profile != PROFILE_ADVANCED) {
                 av_free(unescaped);
                 return AVERROR(ENOSYS);
             }
             seq_found = 1;
             level = get_bits(&gb, 3);
             /* chromaformat, frmrtq_postproc, bitrtq_postproc, postprocflag,
              * width, height */
             skip_bits_long(&gb, 2 + 3 + 5 + 1 + 2*12);
             skip_bits(&gb, 1); /* broadcast */
             interlace = get_bits1(&gb);
             skip_bits(&gb, 4); /* tfcntrflag, finterpflag, reserved, psf */
         }
     }
     if (!seq_found) {
         av_free(unescaped);
         return AVERROR(ENOSYS);
     }
 
     init_put_bits(&pbc, buf, 7);
     /* VC1DecSpecStruc */
     put_bits(&pbc, 4, 12); /* profile - advanced */
     put_bits(&pbc, 3, level);
     put_bits(&pbc, 1, 0); /* reserved */
     /* VC1AdvDecSpecStruc */
     put_bits(&pbc, 3, level);
     put_bits(&pbc, 1, 0); /* cbr */
     put_bits(&pbc, 6, 0); /* reserved */
     put_bits(&pbc, 1, !interlace); /* no interlace */
     put_bits(&pbc, 1, !packet_seq); /* no multiple seq */
     put_bits(&pbc, 1, !packet_entry); /* no multiple entry */
     put_bits(&pbc, 1, !slices); /* no slice code */
     put_bits(&pbc, 1, 0); /* no bframe */
     put_bits(&pbc, 1, 0); /* reserved */
     put_bits32(&pbc, track->enc->time_base.den); /* framerate */
     flush_put_bits(&pbc);
 
     av_free(unescaped);
 
     return 0;
 }
 
 static int mov_write_dvc1_tag(AVIOContext *pb, MOVTrack *track)
 {
     uint8_t buf[7] = { 0 };
     int ret;
 
     if ((ret = mov_write_dvc1_structs(track, buf)) < 0)
         return ret;
 
     avio_wb32(pb, track->vos_len + 8 + sizeof(buf));
     ffio_wfourcc(pb, "dvc1");
     track->vc1_info.struct_offset = avio_tell(pb);
     avio_write(pb, buf, sizeof(buf));
     avio_write(pb, track->vos_data, track->vos_len);
 
     return 0;
 }
 

 static int mov_write_glbl_tag(AVIOContext *pb, MOVTrack *track)

 {

     avio_wb32(pb, track->vos_len + 8);

     ffio_wfourcc(pb, "glbl");

     avio_write(pb, track->vos_data, track->vos_len);
     return 8 + track->vos_len;

 }
 

 /**
  * Compute flags for 'lpcm' tag.
  * See CoreAudioTypes and AudioStreamBasicDescription at Apple.
  */

 static int mov_get_lpcm_flags(enum AVCodecID codec_id)

 {
     switch (codec_id) {

     case AV_CODEC_ID_PCM_F32BE:
     case AV_CODEC_ID_PCM_F64BE:

         return 11;

     case AV_CODEC_ID_PCM_F32LE:
     case AV_CODEC_ID_PCM_F64LE:

         return 9;

     case AV_CODEC_ID_PCM_U8:

         return 10;

     case AV_CODEC_ID_PCM_S16BE:
     case AV_CODEC_ID_PCM_S24BE:
     case AV_CODEC_ID_PCM_S32BE:

         return 14;

     case AV_CODEC_ID_PCM_S8:
     case AV_CODEC_ID_PCM_S16LE:
     case AV_CODEC_ID_PCM_S24LE:
     case AV_CODEC_ID_PCM_S32LE:

         return 12;
     default:
         return 0;
     }
 }
 

 static int get_cluster_duration(MOVTrack *track, int cluster_idx)
 {
     int64_t next_dts;
 
     if (cluster_idx >= track->entry)
         return 0;
 
     if (cluster_idx + 1 == track->entry)
         next_dts = track->track_duration + track->start_dts;
     else
         next_dts = track->cluster[cluster_idx + 1].dts;
 
     return next_dts - track->cluster[cluster_idx].dts;
 }
 

 static int get_samples_per_packet(MOVTrack *track)
 {
     int i, first_duration;
 

 // return track->enc->frame_size;
 

     /* use 1 for raw PCM */
     if (!track->audio_vbr)
         return 1;
 
     /* check to see if duration is constant for all clusters */
     if (!track->entry)
         return 0;
     first_duration = get_cluster_duration(track, 0);
     for (i = 1; i < track->entry; i++) {
         if (get_cluster_duration(track, i) != first_duration)
             return 0;
     }
     return first_duration;
 }
 

 static int mov_write_audio_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     int version = 0;
     uint32_t tag = track->tag;
 
     if (track->mode == MODE_MOV) {

         if (track->timescale > UINT16_MAX) {
             if (mov_get_lpcm_flags(track->enc->codec_id))
                 tag = AV_RL32("lpcm");
             version = 2;
         } else if (track->audio_vbr || mov_pcm_le_gt16(track->enc->codec_id) ||

                    mov_pcm_be_gt16(track->enc->codec_id) ||

                    track->enc->codec_id == AV_CODEC_ID_ADPCM_MS ||
                    track->enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV ||
                    track->enc->codec_id == AV_CODEC_ID_QDM2) {

             version = 1;
         }

     }

     avio_wb32(pb, 0); /* size */
     avio_wl32(pb, tag); // store it byteswapped
     avio_wb32(pb, 0); /* Reserved */
     avio_wb16(pb, 0); /* Reserved */
     avio_wb16(pb, 1); /* Data-reference index, XXX  == 1 */

     /* SoundDescription */

     avio_wb16(pb, version); /* Version */
     avio_wb16(pb, 0); /* Revision level */
     avio_wb32(pb, 0); /* Reserved */

     if (version == 2) {

         avio_wb16(pb, 3);
         avio_wb16(pb, 16);
         avio_wb16(pb, 0xfffe);
         avio_wb16(pb, 0);
         avio_wb32(pb, 0x00010000);
         avio_wb32(pb, 72);

         avio_wb64(pb, av_double2int(track->enc->sample_rate));

         avio_wb32(pb, track->enc->channels);
         avio_wb32(pb, 0x7F000000);
         avio_wb32(pb, av_get_bits_per_sample(track->enc->codec_id));
         avio_wb32(pb, mov_get_lpcm_flags(track->enc->codec_id));

         avio_wb32(pb, track->sample_size);

         avio_wb32(pb, get_samples_per_packet(track));

     } else {

         if (track->mode == MODE_MOV) {
             avio_wb16(pb, track->enc->channels);

             if (track->enc->codec_id == AV_CODEC_ID_PCM_U8 ||
                 track->enc->codec_id == AV_CODEC_ID_PCM_S8)

                 avio_wb16(pb, 8); /* bits per sample */
             else
                 avio_wb16(pb, 16);
             avio_wb16(pb, track->audio_vbr ? -2 : 0); /* compression ID */
         } else { /* reserved for mp4/3gp */
             avio_wb16(pb, 2);
             avio_wb16(pb, 16);
             avio_wb16(pb, 0);
         }

         avio_wb16(pb, 0); /* packet size (= 0) */

         avio_wb16(pb, track->enc->sample_rate <= UINT16_MAX ?
                       track->enc->sample_rate : 0);

         avio_wb16(pb, 0); /* Reserved */

     }

     if(version == 1) { /* SoundDescription V1 extended info */

         if (mov_pcm_le_gt16(track->enc->codec_id) ||
             mov_pcm_be_gt16(track->enc->codec_id))
             avio_wb32(pb, 1); /*  must be 1 for  uncompressed formats */
         else
             avio_wb32(pb, track->enc->frame_size); /* Samples per packet */

         avio_wb32(pb, track->sample_size / track->enc->channels); /* Bytes per packet */
         avio_wb32(pb, track->sample_size); /* Bytes per frame */

         avio_wb32(pb, 2); /* Bytes per sample */
     }
 

     if(track->mode == MODE_MOV &&

        (track->enc->codec_id == AV_CODEC_ID_AAC ||
         track->enc->codec_id == AV_CODEC_ID_AC3 ||
         track->enc->codec_id == AV_CODEC_ID_AMR_NB ||
         track->enc->codec_id == AV_CODEC_ID_ALAC ||
         track->enc->codec_id == AV_CODEC_ID_ADPCM_MS ||

         track->enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV ||
         track->enc->codec_id == AV_CODEC_ID_QDM2 ||

         (mov_pcm_le_gt16(track->enc->codec_id) && version==1) ||
         (mov_pcm_be_gt16(track->enc->codec_id) && version==1)))

         mov_write_wave_tag(pb, track);

     else if(track->tag == MKTAG('m','p','4','a'))

         mov_write_esds_tag(pb, track);

     else if(track->enc->codec_id == AV_CODEC_ID_AMR_NB)

         mov_write_amr_tag(pb, track);

     else if(track->enc->codec_id == AV_CODEC_ID_AC3)

         mov_write_ac3_tag(pb, track);

     else if(track->enc->codec_id == AV_CODEC_ID_ALAC)

         mov_write_extradata_tag(pb, track);

     else if (track->enc->codec_id == AV_CODEC_ID_WMAPRO)

         mov_write_wfex_tag(pb, track);

     else if (track->vos_len > 0)

         mov_write_glbl_tag(pb, track);

     if (track->mode == MODE_MOV && track->enc->codec_type == AVMEDIA_TYPE_AUDIO)
         mov_write_chan_tag(pb, track);
 

     return update_size(pb, pos);

 }
 

 static int mov_write_d263_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 0xf); /* size */

     ffio_wfourcc(pb, "d263");
     ffio_wfourcc(pb, "FFMP");

     avio_w8(pb, 0); /* decoder version */

     /* FIXME use AVCodecContext level/profile, when encoder will set values */

     avio_w8(pb, 0xa); /* level */
     avio_w8(pb, 0); /* profile */

     return 0xf;
 }
 

 static int mov_write_avcc_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0);

     ffio_wfourcc(pb, "avcC");

     ff_isom_write_avcc(pb, track->vos_data, track->vos_len);
     return update_size(pb, pos);

 }
 

 /* also used by all avid codecs (dv, imx, meridien) and their variants */

 static int mov_write_avid_tag(AVIOContext *pb, MOVTrack *track)

 {
     int i;

     avio_wb32(pb, 24); /* size */

     ffio_wfourcc(pb, "ACLR");
     ffio_wfourcc(pb, "ACLR");
     ffio_wfourcc(pb, "0001");

     avio_wb32(pb, 2); /* yuv range: full 1 / normal 2 */

     avio_wb32(pb, 0); /* unknown */

     avio_wb32(pb, 24); /* size */

     ffio_wfourcc(pb, "APRG");
     ffio_wfourcc(pb, "APRG");
     ffio_wfourcc(pb, "0001");

     avio_wb32(pb, 1); /* unknown */
     avio_wb32(pb, 0); /* unknown */

     avio_wb32(pb, 120); /* size */

     ffio_wfourcc(pb, "ARES");
     ffio_wfourcc(pb, "ARES");
     ffio_wfourcc(pb, "0001");

     avio_wb32(pb, AV_RB32(track->vos_data + 0x28)); /* dnxhd cid, some id ? */

     avio_wb32(pb, track->enc->width);

     /* values below are based on samples created with quicktime and avid codecs */

     if (track->vos_data[5] & 2) { // interlaced

         avio_wb32(pb, track->enc->height/2);
         avio_wb32(pb, 2); /* unknown */
         avio_wb32(pb, 0); /* unknown */
         avio_wb32(pb, 4); /* unknown */

     } else {

         avio_wb32(pb, track->enc->height);
         avio_wb32(pb, 1); /* unknown */
         avio_wb32(pb, 0); /* unknown */

         if (track->enc->height == 1080)

             avio_wb32(pb, 5); /* unknown */

         else

             avio_wb32(pb, 6); /* unknown */

     }
     /* padding */
     for (i = 0; i < 10; i++)

         avio_wb64(pb, 0);

 
     /* extra padding for stsd needed */

     avio_wb32(pb, 0);

     return 0;
 }
 

 static int mp4_get_codec_tag(AVFormatContext *s, MOVTrack *track)

 {

     int tag = track->enc->codec_tag;

     if (!ff_codec_get_tag(ff_mp4_obj_type, track->enc->codec_id))

         return 0;
 

     if      (track->enc->codec_id == AV_CODEC_ID_H264)      tag = MKTAG('a','v','c','1');
     else if (track->enc->codec_id == AV_CODEC_ID_AC3)       tag = MKTAG('a','c','-','3');
     else if (track->enc->codec_id == AV_CODEC_ID_DIRAC)     tag = MKTAG('d','r','a','c');
     else if (track->enc->codec_id == AV_CODEC_ID_MOV_TEXT)  tag = MKTAG('t','x','3','g');
     else if (track->enc->codec_id == AV_CODEC_ID_VC1)       tag = MKTAG('v','c','-','1');

     else if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) tag = MKTAG('m','p','4','v');
     else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO) tag = MKTAG('m','p','4','a');

 
     return tag;
 }
 

 static const AVCodecTag codec_ipod_tags[] = {

     { AV_CODEC_ID_H264,   MKTAG('a','v','c','1') },
     { AV_CODEC_ID_MPEG4,  MKTAG('m','p','4','v') },
     { AV_CODEC_ID_AAC,    MKTAG('m','p','4','a') },
     { AV_CODEC_ID_ALAC,   MKTAG('a','l','a','c') },
     { AV_CODEC_ID_AC3,    MKTAG('a','c','-','3') },
     { AV_CODEC_ID_MOV_TEXT, MKTAG('t','x','3','g') },
     { AV_CODEC_ID_MOV_TEXT, MKTAG('t','e','x','t') },
     { AV_CODEC_ID_NONE, 0 },

 };
 

 static int ipod_get_codec_tag(AVFormatContext *s, MOVTrack *track)
 {
     int tag = track->enc->codec_tag;
 

     // keep original tag for subs, ipod supports both formats

     if (!(track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE &&

         (tag == MKTAG('t','x','3','g') ||

          tag == MKTAG('t','e','x','t'))))

         tag = ff_codec_get_tag(codec_ipod_tags, track->enc->codec_id);

     if (!av_match_ext(s->filename, "m4a") && !av_match_ext(s->filename, "m4v"))

         av_log(s, AV_LOG_WARNING, "Warning, extension is not .m4a nor .m4v "
                "Quicktime/Ipod might not play the file\n");

 
     return tag;
 }
 
 static int mov_get_dv_codec_tag(AVFormatContext *s, MOVTrack *track)
 {
     int tag;
 

     if (track->enc->width == 720) { /* SD */
         if (track->enc->height == 480) { /* NTSC */

             if  (track->enc->pix_fmt == AV_PIX_FMT_YUV422P) tag = MKTAG('d','v','5','n');

             else                                         tag = MKTAG('d','v','c',' ');

        }else if (track->enc->pix_fmt == AV_PIX_FMT_YUV422P) tag = MKTAG('d','v','5','p');

         else if (track->enc->pix_fmt == AV_PIX_FMT_YUV420P) tag = MKTAG('d','v','c','p');

         else                                             tag = MKTAG('d','v','p','p');

     } else if (track->enc->height == 720) { /* HD 720 line */

         if  (track->enc->time_base.den == 50)            tag = MKTAG('d','v','h','q');
         else                                             tag = MKTAG('d','v','h','p');

     } else if (track->enc->height == 1080) { /* HD 1080 line */

         if  (track->enc->time_base.den == 25)            tag = MKTAG('d','v','h','5');
         else                                             tag = MKTAG('d','v','h','6');

     } else {

         av_log(s, AV_LOG_ERROR, "unsupported height for dv codec\n");
         return 0;
     }

 
     return tag;
 }
 

 static const struct {

     enum AVPixelFormat pix_fmt;

     uint32_t tag;
     unsigned bps;
 } mov_pix_fmt_tags[] = {

     { AV_PIX_FMT_YUYV422, MKTAG('y','u','v','2'),  0 },

     { AV_PIX_FMT_YUYV422, MKTAG('y','u','v','s'),  0 },
     { AV_PIX_FMT_UYVY422, MKTAG('2','v','u','y'),  0 },
     { AV_PIX_FMT_RGB555BE,MKTAG('r','a','w',' '), 16 },
     { AV_PIX_FMT_RGB555LE,MKTAG('L','5','5','5'), 16 },
     { AV_PIX_FMT_RGB565LE,MKTAG('L','5','6','5'), 16 },
     { AV_PIX_FMT_RGB565BE,MKTAG('B','5','6','5'), 16 },
     { AV_PIX_FMT_GRAY16BE,MKTAG('b','1','6','g'), 16 },
     { AV_PIX_FMT_RGB24,   MKTAG('r','a','w',' '), 24 },
     { AV_PIX_FMT_BGR24,   MKTAG('2','4','B','G'), 24 },
     { AV_PIX_FMT_ARGB,    MKTAG('r','a','w',' '), 32 },
     { AV_PIX_FMT_BGRA,    MKTAG('B','G','R','A'), 32 },
     { AV_PIX_FMT_RGBA,    MKTAG('R','G','B','A'), 32 },
     { AV_PIX_FMT_ABGR,    MKTAG('A','B','G','R'), 32 },
     { AV_PIX_FMT_RGB48BE, MKTAG('b','4','8','r'), 48 },

 };
 

 static int mov_get_rawvideo_codec_tag(AVFormatContext *s, MOVTrack *track)
 {
     int tag = track->enc->codec_tag;

     int i;
 
     for (i = 0; i < FF_ARRAY_ELEMS(mov_pix_fmt_tags); i++) {

         if (track->enc->pix_fmt == mov_pix_fmt_tags[i].pix_fmt) {

             tag = mov_pix_fmt_tags[i].tag;
             track->enc->bits_per_coded_sample = mov_pix_fmt_tags[i].bps;

             if (track->enc->codec_tag == mov_pix_fmt_tags[i].tag)
                 break;

         }
     }

 
     return tag;
 }
 
 static int mov_get_codec_tag(AVFormatContext *s, MOVTrack *track)
 {
     int tag = track->enc->codec_tag;
 
     if (!tag || (track->enc->strict_std_compliance >= FF_COMPLIANCE_NORMAL &&

                  (track->enc->codec_id == AV_CODEC_ID_DVVIDEO ||
                   track->enc->codec_id == AV_CODEC_ID_RAWVIDEO ||
                   track->enc->codec_id == AV_CODEC_ID_H263 ||

                   av_get_bits_per_sample(track->enc->codec_id)))) { // pcm audio

         if (track->enc->codec_id == AV_CODEC_ID_DVVIDEO)

             tag = mov_get_dv_codec_tag(s, track);

         else if (track->enc->codec_id == AV_CODEC_ID_RAWVIDEO)

             tag = mov_get_rawvideo_codec_tag(s, track);

         else if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) {

             tag = ff_codec_get_tag(ff_codec_movvideo_tags, track->enc->codec_id);

             if (!tag) { // if no mac fcc found, try with Microsoft tags

                 tag = ff_codec_get_tag(ff_codec_bmp_tags, track->enc->codec_id);

                 if (tag)

                     av_log(s, AV_LOG_WARNING, "Using MS style video codec tag, "

                            "the file may be unplayable!\n");
             }

         } else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO) {

             tag = ff_codec_get_tag(ff_codec_movaudio_tags, track->enc->codec_id);

             if (!tag) { // if no mac fcc found, try with Microsoft tags

                 int ms_tag = ff_codec_get_tag(ff_codec_wav_tags, track->enc->codec_id);

                 if (ms_tag) {
                     tag = MKTAG('m', 's', ((ms_tag >> 8) & 0xff), (ms_tag & 0xff));

                     av_log(s, AV_LOG_WARNING, "Using MS style audio codec tag, "

                            "the file may be unplayable!\n");

                 }

             }

         } else if (track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE)

             tag = ff_codec_get_tag(ff_codec_movsubtitle_tags, track->enc->codec_id);

     }

     return tag;
 }
 

 static const AVCodecTag codec_3gp_tags[] = {

     { AV_CODEC_ID_H263,   MKTAG('s','2','6','3') },
     { AV_CODEC_ID_H264,   MKTAG('a','v','c','1') },
     { AV_CODEC_ID_MPEG4,  MKTAG('m','p','4','v') },
     { AV_CODEC_ID_AAC,    MKTAG('m','p','4','a') },
     { AV_CODEC_ID_AMR_NB, MKTAG('s','a','m','r') },
     { AV_CODEC_ID_AMR_WB, MKTAG('s','a','w','b') },
     { AV_CODEC_ID_MOV_TEXT, MKTAG('t','x','3','g') },
     { AV_CODEC_ID_NONE, 0 },

 };
 

 static const AVCodecTag codec_f4v_tags[] = { // XXX: add GIF/PNG/JPEG?
     { AV_CODEC_ID_MP3,    MKTAG('.','m','p','3') },
     { AV_CODEC_ID_AAC,    MKTAG('m','p','4','a') },
     { AV_CODEC_ID_H264,   MKTAG('a','v','c','1') },
     { AV_CODEC_ID_VP6F,   MKTAG('V','P','6','F') },
     { AV_CODEC_ID_NONE, 0 },
 };
 

 static int mov_find_codec_tag(AVFormatContext *s, MOVTrack *track)
 {

     int tag;

     if (track->mode == MODE_MP4 || track->mode == MODE_PSP)
         tag = mp4_get_codec_tag(s, track);
     else if (track->mode == MODE_ISM) {

         tag = mp4_get_codec_tag(s, track);

         if (!tag && track->enc->codec_id == AV_CODEC_ID_WMAPRO)

             tag = MKTAG('w', 'm', 'a', ' ');
     } else if (track->mode == MODE_IPOD)

         tag = ipod_get_codec_tag(s, track);
     else if (track->mode & MODE_3GP)

         tag = ff_codec_get_tag(codec_3gp_tags, track->enc->codec_id);

     else if (track->mode & MODE_F4V)
         tag = ff_codec_get_tag(codec_f4v_tags, track->enc->codec_id);

     else
         tag = mov_get_codec_tag(s, track);
 
     return tag;
 }
 

 /** Write uuid atom.
  * Needed to make file play in iPods running newest firmware
  * goes after avcC atom in moov.trak.mdia.minf.stbl.stsd.avc1
  */

 static int mov_write_uuid_tag_ipod(AVIOContext *pb)

 {

     avio_wb32(pb, 28);

     ffio_wfourcc(pb, "uuid");

     avio_wb32(pb, 0x6b6840f2);
     avio_wb32(pb, 0x5f244fc5);
     avio_wb32(pb, 0xba39a51b);
     avio_wb32(pb, 0xcf0323f3);
     avio_wb32(pb, 0x0);

     return 28;
 }
 

 static const uint16_t fiel_data[] = {
     0x0000, 0x0100, 0x0201, 0x0206, 0x0209, 0x020e
 };
 
 static int mov_write_fiel_tag(AVIOContext *pb, MOVTrack *track)
 {
     unsigned mov_field_order = 0;
     if (track->enc->field_order < FF_ARRAY_ELEMS(fiel_data))
         mov_field_order = fiel_data[track->enc->field_order];
     else
         return 0;
     avio_wb32(pb, 10);
     ffio_wfourcc(pb, "fiel");
     avio_wb16(pb, mov_field_order);
     return 10;
 }
 

 static int mov_write_subtitle_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0);    /* size */
     avio_wl32(pb, track->tag); // store it byteswapped
     avio_wb32(pb, 0);    /* Reserved */
     avio_wb16(pb, 0);    /* Reserved */
     avio_wb16(pb, 1);    /* Data-reference index */

 
     if (track->enc->extradata_size)

         avio_write(pb, track->enc->extradata, track->enc->extradata_size);

     return update_size(pb, pos);

 }
 

 static int mov_write_pasp_tag(AVIOContext *pb, MOVTrack *track)

 {
     AVRational sar;
     av_reduce(&sar.num, &sar.den, track->enc->sample_aspect_ratio.num,
               track->enc->sample_aspect_ratio.den, INT_MAX);
 

     avio_wb32(pb, 16);

     ffio_wfourcc(pb, "pasp");

     avio_wb32(pb, sar.num);
     avio_wb32(pb, sar.den);

     return 16;
 }
 

 static int mov_write_video_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     char compressor_name[32] = { 0 };

     avio_wb32(pb, 0); /* size */
     avio_wl32(pb, track->tag); // store it byteswapped
     avio_wb32(pb, 0); /* Reserved */
     avio_wb16(pb, 0); /* Reserved */
     avio_wb16(pb, 1); /* Data-reference index */

     avio_wb16(pb, 0); /* Codec stream version */
     avio_wb16(pb, 0); /* Codec stream revision (=0) */

     if (track->mode == MODE_MOV) {

         ffio_wfourcc(pb, "FFMP"); /* Vendor */

         if(track->enc->codec_id == AV_CODEC_ID_RAWVIDEO) {

             avio_wb32(pb, 0); /* Temporal Quality */
             avio_wb32(pb, 0x400); /* Spatial Quality = lossless*/

         } else {

             avio_wb32(pb, 0x200); /* Temporal Quality = normal */
             avio_wb32(pb, 0x200); /* Spatial Quality = normal */

         }

     } else {

         avio_wb32(pb, 0); /* Reserved */
         avio_wb32(pb, 0); /* Reserved */
         avio_wb32(pb, 0); /* Reserved */

     }

     avio_wb16(pb, track->enc->width); /* Video width */
     avio_wb16(pb, track->height); /* Video height */
     avio_wb32(pb, 0x00480000); /* Horizontal resolution 72dpi */
     avio_wb32(pb, 0x00480000); /* Vertical resolution 72dpi */
     avio_wb32(pb, 0); /* Data size (= 0) */
     avio_wb16(pb, 1); /* Frame count (= 1) */

     /* FIXME not sure, ISO 14496-1 draft where it shall be set to 0 */
     if (track->mode == MODE_MOV && track->enc->codec && track->enc->codec->name)

         av_strlcpy(compressor_name,track->enc->codec->name,32);

     avio_w8(pb, strlen(compressor_name));
     avio_write(pb, compressor_name, 31);

     if (track->mode == MODE_MOV && track->enc->bits_per_coded_sample)

         avio_wb16(pb, track->enc->bits_per_coded_sample);

     else

         avio_wb16(pb, 0x18); /* Reserved */
     avio_wb16(pb, 0xffff); /* Reserved */

     if(track->tag == MKTAG('m','p','4','v'))

         mov_write_esds_tag(pb, track);

     else if(track->enc->codec_id == AV_CODEC_ID_H263)

         mov_write_d263_tag(pb);

     else if(track->enc->codec_id == AV_CODEC_ID_AVUI ||
             track->enc->codec_id == AV_CODEC_ID_SVQ3) {

         mov_write_extradata_tag(pb, track);

         avio_wb32(pb, 0);

     } else if(track->enc->codec_id == AV_CODEC_ID_DNXHD)

         mov_write_avid_tag(pb, track);

     else if(track->enc->codec_id == AV_CODEC_ID_H264) {

         mov_write_avcc_tag(pb, track);

         if(track->mode == MODE_IPOD)
             mov_write_uuid_tag_ipod(pb);

     } else if (track->enc->codec_id == AV_CODEC_ID_VC1 && track->vos_len > 0)

         mov_write_dvc1_tag(pb, track);

     else if (track->vos_len > 0)

         mov_write_glbl_tag(pb, track);

     if (track->enc->codec_id != AV_CODEC_ID_H264 &&
         track->enc->codec_id != AV_CODEC_ID_MPEG4 &&
         track->enc->codec_id != AV_CODEC_ID_DNXHD)
         if (track->enc->field_order != AV_FIELD_UNKNOWN)
             mov_write_fiel_tag(pb, track);

     if (track->enc->sample_aspect_ratio.den && track->enc->sample_aspect_ratio.num &&

         track->enc->sample_aspect_ratio.den != track->enc->sample_aspect_ratio.num) {
         mov_write_pasp_tag(pb, track);
     }
 

     return update_size(pb, pos);

 }
 

 static int mov_write_tmcd_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);

     int frame_duration = av_rescale(track->timescale, track->enc->time_base.num, track->enc->time_base.den);

     int nb_frames = 1.0/av_q2d(track->enc->time_base) + 0.5;

     if (nb_frames > 255) {
         av_log(NULL, AV_LOG_ERROR, "fps %d is too large\n", nb_frames);
         return AVERROR(EINVAL);
     }
 

     avio_wb32(pb, 0); /* size */
     ffio_wfourcc(pb, "tmcd");               /* Data format */
     avio_wb32(pb, 0);                       /* Reserved */
     avio_wb32(pb, 1);                       /* Data reference index */
     avio_wb32(pb, 0);                       /* Flags */
     avio_wb32(pb, track->timecode_flags);   /* Flags (timecode) */
     avio_wb32(pb, track->timescale);        /* Timescale */
     avio_wb32(pb, frame_duration);          /* Frame duration */
     avio_w8(pb, nb_frames);                 /* Number of frames */
     avio_wb24(pb, 0);                       /* Reserved */
     /* TODO: source reference string */
     return update_size(pb, pos);
 }
 

 static int mov_write_rtp_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "rtp ");

     avio_wb32(pb, 0); /* Reserved */
     avio_wb16(pb, 0); /* Reserved */
     avio_wb16(pb, 1); /* Data-reference index */

     avio_wb16(pb, 1); /* Hint track version */
     avio_wb16(pb, 1); /* Highest compatible version */
     avio_wb32(pb, track->max_packet_size); /* Max packet size */

     avio_wb32(pb, 12); /* size */

     ffio_wfourcc(pb, "tims");

     avio_wb32(pb, track->timescale);

     return update_size(pb, pos);

 }
 

 static int mov_write_stsd_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "stsd");

     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, 1); /* entry count */

     if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO)

         mov_write_video_tag(pb, track);

     else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO)

         mov_write_audio_tag(pb, track);

     else if (track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE)

         mov_write_subtitle_tag(pb, track);

     else if (track->enc->codec_tag == MKTAG('r','t','p',' '))
         mov_write_rtp_tag(pb, track);

     else if (track->enc->codec_tag == MKTAG('t','m','c','d'))
         mov_write_tmcd_tag(pb, track);

     return update_size(pb, pos);

 }
 

 static int mov_write_ctts_tag(AVIOContext *pb, MOVTrack *track)

 {

     MOVStts *ctts_entries;

     uint32_t entries = 0;
     uint32_t atom_size;
     int i;
 
     ctts_entries = av_malloc((track->entry + 1) * sizeof(*ctts_entries)); /* worst case */
     ctts_entries[0].count = 1;

     ctts_entries[0].duration = track->cluster[0].cts;

     for (i=1; i<track->entry; i++) {

         if (track->cluster[i].cts == ctts_entries[entries].duration) {

             ctts_entries[entries].count++; /* compress */
         } else {
             entries++;

             ctts_entries[entries].duration = track->cluster[i].cts;

             ctts_entries[entries].count = 1;
         }
     }
     entries++; /* last one */
     atom_size = 16 + (entries * 8);

     avio_wb32(pb, atom_size); /* size */

     ffio_wfourcc(pb, "ctts");

     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, entries); /* entry count */

     for (i=0; i<entries; i++) {

         avio_wb32(pb, ctts_entries[i].count);
         avio_wb32(pb, ctts_entries[i].duration);

     }
     av_free(ctts_entries);
     return atom_size;
 }
 

 /* Time to sample atom */

 static int mov_write_stts_tag(AVIOContext *pb, MOVTrack *track)

 {

     MOVStts *stts_entries;

     uint32_t entries = -1;
     uint32_t atom_size;
     int i;
 

     if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO && !track->audio_vbr) {

         stts_entries = av_malloc(sizeof(*stts_entries)); /* one entry */

         stts_entries[0].count = track->sample_count;

         stts_entries[0].duration = 1;
         entries = 1;
     } else {

         stts_entries = track->entry ?
                        av_malloc(track->entry * sizeof(*stts_entries)) : /* worst case */
                        NULL;

         for (i=0; i<track->entry; i++) {

             int duration = get_cluster_duration(track, i);

             if (i && duration == stts_entries[entries].duration) {
                 stts_entries[entries].count++; /* compress */
             } else {
                 entries++;
                 stts_entries[entries].duration = duration;
                 stts_entries[entries].count = 1;
             }
         }
         entries++; /* last one */
     }
     atom_size = 16 + (entries * 8);

     avio_wb32(pb, atom_size); /* size */

     ffio_wfourcc(pb, "stts");

     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, entries); /* entry count */

     for (i=0; i<entries; i++) {

         avio_wb32(pb, stts_entries[i].count);
         avio_wb32(pb, stts_entries[i].duration);

     }
     av_free(stts_entries);
     return atom_size;

 }
 

 static int mov_write_dref_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 28); /* size */

     ffio_wfourcc(pb, "dref");

     avio_wb32(pb, 0); /* version & flags */
     avio_wb32(pb, 1); /* entry count */

     avio_wb32(pb, 0xc); /* size */

     //FIXME add the alis and rsrc atom

     ffio_wfourcc(pb, "url ");

     avio_wb32(pb, 1); /* version & flags */

 
     return 28;
 }
 

 static int mov_write_stbl_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "stbl");

     mov_write_stsd_tag(pb, track);
     mov_write_stts_tag(pb, track);

     if ((track->enc->codec_type == AVMEDIA_TYPE_VIDEO ||
          track->enc->codec_tag == MKTAG('r','t','p',' ')) &&

         track->has_keyframes && track->has_keyframes < track->entry)

         mov_write_stss_tag(pb, track, MOV_SYNC_SAMPLE);
     if (track->mode == MODE_MOV && track->flags & MOV_TRACK_STPS)
         mov_write_stss_tag(pb, track, MOV_PARTIAL_SYNC_SAMPLE);

     if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO &&

         track->flags & MOV_TRACK_CTTS)

         mov_write_ctts_tag(pb, track);

     mov_write_stsc_tag(pb, track);
     mov_write_stsz_tag(pb, track);
     mov_write_stco_tag(pb, track);

     return update_size(pb, pos);

 }
 

 static int mov_write_dinf_tag(AVIOContext *pb)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "dinf");

     mov_write_dref_tag(pb);

     return update_size(pb, pos);

 }
 

 static int mov_write_nmhd_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 12);

     ffio_wfourcc(pb, "nmhd");

     avio_wb32(pb, 0);

     return 12;
 }
 

 static int mov_write_tcmi_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);
     const char *font = "Lucida Grande";
     avio_wb32(pb, 0);                   /* size */
     ffio_wfourcc(pb, "tcmi");           /* timecode media information atom */
     avio_wb32(pb, 0);                   /* version & flags */
     avio_wb16(pb, 0);                   /* text font */
     avio_wb16(pb, 0);                   /* text face */
     avio_wb16(pb, 12);                  /* text size */
     avio_wb16(pb, 0);                   /* (unknown, not in the QT specs...) */
     avio_wb16(pb, 0x0000);              /* text color (red) */
     avio_wb16(pb, 0x0000);              /* text color (green) */
     avio_wb16(pb, 0x0000);              /* text color (blue) */
     avio_wb16(pb, 0xffff);              /* background color (red) */
     avio_wb16(pb, 0xffff);              /* background color (green) */
     avio_wb16(pb, 0xffff);              /* background color (blue) */
     avio_w8(pb, strlen(font));          /* font len (part of the pascal string) */
     avio_write(pb, font, strlen(font)); /* font name */
     return update_size(pb, pos);
 }
 
 static int mov_write_gmhd_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);
     avio_wb32(pb, 0);      /* size */

     ffio_wfourcc(pb, "gmhd");

     avio_wb32(pb, 0x18);   /* gmin size */

     ffio_wfourcc(pb, "gmin");/* generic media info */

     avio_wb32(pb, 0);      /* version & flags */
     avio_wb16(pb, 0x40);   /* graphics mode = */
     avio_wb16(pb, 0x8000); /* opColor (r?) */
     avio_wb16(pb, 0x8000); /* opColor (g?) */
     avio_wb16(pb, 0x8000); /* opColor (b?) */
     avio_wb16(pb, 0);      /* balance */
     avio_wb16(pb, 0);      /* reserved */

 
     /*
      * This special text atom is required for
      * Apple Quicktime chapters. The contents
      * don't appear to be documented, so the
      * bytes are copied verbatim.
      */

     if (track->tag != MKTAG('c','6','0','8')) {

     avio_wb32(pb, 0x2C);   /* size */
     ffio_wfourcc(pb, "text");
     avio_wb16(pb, 0x01);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x01);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x00);
     avio_wb32(pb, 0x00004000);
     avio_wb16(pb, 0x0000);

     }

     if (track->enc->codec_tag == MKTAG('t','m','c','d')) {
         int64_t tmcd_pos = avio_tell(pb);
         avio_wb32(pb, 0); /* size */
         ffio_wfourcc(pb, "tmcd");
         mov_write_tcmi_tag(pb, track);
         update_size(pb, tmcd_pos);
     }
     return update_size(pb, pos);

 }
 

 static int mov_write_smhd_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 16); /* size */

     ffio_wfourcc(pb, "smhd");

     avio_wb32(pb, 0); /* version & flags */
     avio_wb16(pb, 0); /* reserved (balance, normally = 0) */
     avio_wb16(pb, 0); /* reserved */

     return 16;
 }
 

 static int mov_write_vmhd_tag(AVIOContext *pb)

 {

     avio_wb32(pb, 0x14); /* size (always 0x14) */

     ffio_wfourcc(pb, "vmhd");

     avio_wb32(pb, 0x01); /* version & flags */
     avio_wb64(pb, 0); /* reserved (graphics mode = copy) */

     return 0x14;
 }
 

 static int mov_write_hdlr_tag(AVIOContext *pb, MOVTrack *track)

 {

     const char *hdlr, *descr = NULL, *hdlr_type = NULL;

     int64_t pos = avio_tell(pb);

     if (!track) { /* no media --> data handler */

         hdlr = "dhlr";
         hdlr_type = "url ";
         descr = "DataHandler";

     } else {

         hdlr = (track->mode == MODE_MOV) ? "mhlr" : "\0\0\0\0";

         if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) {

             hdlr_type = "vide";
             descr = "VideoHandler";

         } else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO) {

             hdlr_type = "soun";
             descr = "SoundHandler";

         } else if (track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE) {

             if (track->tag == MKTAG('c','6','0','8')) {
                 hdlr_type = "clcp";
                 descr = "ClosedCaptionHandler";
             } else {

             if (track->tag == MKTAG('t','x','3','g')) hdlr_type = "sbtl";

             else                                      hdlr_type = "text";

             descr = "SubtitleHandler";

             }

         } else if (track->enc->codec_tag == MKTAG('t','m','c','d')) {
             hdlr_type = "tmcd";
             descr = "TimeCodeHandler";

         } else if (track->enc->codec_tag == MKTAG('r','t','p',' ')) {
             hdlr_type = "hint";
             descr = "HintHandler";

         } else {
             hdlr = "dhlr";
             hdlr_type = "url ";
             descr = "DataHandler";

         }

     }

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "hdlr");

     avio_wb32(pb, 0); /* Version & flags */
     avio_write(pb, hdlr, 4); /* handler */

     ffio_wfourcc(pb, hdlr_type); /* handler type */

     avio_wb32(pb ,0); /* reserved */
     avio_wb32(pb ,0); /* reserved */
     avio_wb32(pb ,0); /* reserved */

     if (!track || track->mode == MODE_MOV)

         avio_w8(pb, strlen(descr)); /* pascal string */
     avio_write(pb, descr, strlen(descr)); /* handler description */

     if (track && track->mode != MODE_MOV)

         avio_w8(pb, 0); /* c string */

     return update_size(pb, pos);

 }
 

 static int mov_write_hmhd_tag(AVIOContext *pb)

 {
     /* This atom must be present, but leaving the values at zero
      * seems harmless. */

     avio_wb32(pb, 28); /* size */

     ffio_wfourcc(pb, "hmhd");

     avio_wb32(pb, 0); /* version, flags */
     avio_wb16(pb, 0); /* maxPDUsize */
     avio_wb16(pb, 0); /* avgPDUsize */
     avio_wb32(pb, 0); /* maxbitrate */
     avio_wb32(pb, 0); /* avgbitrate */
     avio_wb32(pb, 0); /* reserved */

     return 28;
 }
 

 static int mov_write_minf_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "minf");

     if(track->enc->codec_type == AVMEDIA_TYPE_VIDEO)

         mov_write_vmhd_tag(pb);

     else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO)

         mov_write_smhd_tag(pb);

     else if (track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE) {

         if (track->tag == MKTAG('t','e','x','t') || track->tag == MKTAG('c','6','0','8')) {
             mov_write_gmhd_tag(pb, track);
         } else {
             mov_write_nmhd_tag(pb);
         }

     } else if (track->tag == MKTAG('t','m','c','d')) {
         mov_write_gmhd_tag(pb, track);

     } else if (track->tag == MKTAG('r','t','p',' ')) {
         mov_write_hmhd_tag(pb);

     }

     if (track->mode == MODE_MOV) /* FIXME: Why do it for MODE_MOV only ? */
         mov_write_hdlr_tag(pb, NULL);
     mov_write_dinf_tag(pb);
     mov_write_stbl_tag(pb, track);

     return update_size(pb, pos);

 }
 

 static int mov_write_mdhd_tag(AVIOContext *pb, MOVTrack *track)

 {

     int version = track->track_duration < INT32_MAX ? 0 : 1;

     if (track->mode == MODE_ISM)
         version = 1;
 

     (version == 1) ? avio_wb32(pb, 44) : avio_wb32(pb, 32); /* size */

     ffio_wfourcc(pb, "mdhd");

     avio_w8(pb, version);
     avio_wb24(pb, 0); /* flags */

     if (version == 1) {

         avio_wb64(pb, track->time);
         avio_wb64(pb, track->time);

     } else {

         avio_wb32(pb, track->time); /* creation time */
         avio_wb32(pb, track->time); /* modification time */

     }

     avio_wb32(pb, track->timescale); /* time scale (sample rate for audio) */

     if (!track->entry)
         (version == 1) ? avio_wb64(pb, UINT64_C(0xffffffffffffffff)) : avio_wb32(pb, 0xffffffff);
     else
         (version == 1) ? avio_wb64(pb, track->track_duration) : avio_wb32(pb, track->track_duration); /* duration */

     avio_wb16(pb, track->language); /* language */
     avio_wb16(pb, 0); /* reserved (quality) */

 
     if(version!=0 && track->mode == MODE_MOV){
         av_log(NULL, AV_LOG_ERROR,
             "FATAL error, file duration too long for timebase, this file will not be\n"

             "playable with quicktime. Choose a different timebase or a different\n"

             "container format\n");
     }
 

     return 32;
 }
 

 static int mov_write_mdia_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "mdia");

     mov_write_mdhd_tag(pb, track);
     mov_write_hdlr_tag(pb, track);
     mov_write_minf_tag(pb, track);

     return update_size(pb, pos);

 }
 

 /* transformation matrix
      |a  b  u|
      |c  d  v|
      |tx ty w| */
 static void write_matrix(AVIOContext *pb, int16_t a, int16_t b, int16_t c,
                          int16_t d, int16_t tx, int16_t ty)
 {
     avio_wb32(pb, a << 16);  /* 16.16 format */
     avio_wb32(pb, b << 16);  /* 16.16 format */
     avio_wb32(pb, 0);        /* u in 2.30 format */
     avio_wb32(pb, c << 16);  /* 16.16 format */
     avio_wb32(pb, d << 16);  /* 16.16 format */
     avio_wb32(pb, 0);        /* v in 2.30 format */
     avio_wb32(pb, tx << 16); /* 16.16 format */
     avio_wb32(pb, ty << 16); /* 16.16 format */
     avio_wb32(pb, 1 << 30);  /* w in 2.30 format */
 }
 

 static int mov_write_tkhd_tag(AVIOContext *pb, MOVTrack *track, AVStream *st)

 {

     int64_t duration = av_rescale_rnd(track->track_duration, MOV_TIMESCALE,

                                       track->timescale, AV_ROUND_UP);

     int version = duration < INT32_MAX ? 0 : 1;

     int rotation = 0;

     if (track->mode == MODE_ISM)
         version = 1;
 

     (version == 1) ? avio_wb32(pb, 104) : avio_wb32(pb, 92); /* size */

     ffio_wfourcc(pb, "tkhd");

     avio_w8(pb, version);
     avio_wb24(pb, 0xf); /* flags (track enabled) */

     if (version == 1) {

         avio_wb64(pb, track->time);
         avio_wb64(pb, track->time);

     } else {

         avio_wb32(pb, track->time); /* creation time */
         avio_wb32(pb, track->time); /* modification time */

     }

     avio_wb32(pb, track->track_id); /* track-id */

     avio_wb32(pb, 0); /* reserved */

     if (!track->entry)
         (version == 1) ? avio_wb64(pb, UINT64_C(0xffffffffffffffff)) : avio_wb32(pb, 0xffffffff);
     else
         (version == 1) ? avio_wb64(pb, duration) : avio_wb32(pb, duration);

     avio_wb32(pb, 0); /* reserved */
     avio_wb32(pb, 0); /* reserved */

     avio_wb16(pb, 0); /* layer */

     avio_wb16(pb, st ? st->codec->codec_type : 0); /* alternate group) */

     /* Volume, only for audio */

     if(track->enc->codec_type == AVMEDIA_TYPE_AUDIO)

         avio_wb16(pb, 0x0100);

     else

         avio_wb16(pb, 0);
     avio_wb16(pb, 0); /* reserved */

 
     /* Matrix structure */

     if (st && st->metadata) {
         AVDictionaryEntry *rot = av_dict_get(st->metadata, "rotate", NULL, 0);
         rotation = (rot && rot->value) ? atoi(rot->value) : 0;
     }
     if (rotation == 90) {
         write_matrix(pb,  0,  1, -1,  0, track->enc->height, 0);
     } else if (rotation == 180) {
         write_matrix(pb, -1,  0,  0, -1, track->enc->width, track->enc->height);
     } else if (rotation == 270) {
         write_matrix(pb,  0, -1,  1,  0, 0, track->enc->width);
     } else {
         write_matrix(pb,  1,  0,  0,  1, 0, 0);
     }

     /* Track width and height, for visual only */

     if(st && (track->enc->codec_type == AVMEDIA_TYPE_VIDEO ||
               track->enc->codec_type == AVMEDIA_TYPE_SUBTITLE)) {

         if(track->mode == MODE_MOV) {
             avio_wb32(pb, track->enc->width << 16);

             avio_wb32(pb, track->height << 16);

         } else {

             double sample_aspect_ratio = av_q2d(st->sample_aspect_ratio);
             if(!sample_aspect_ratio || track->height != track->enc->height)
                 sample_aspect_ratio = 1;
             avio_wb32(pb, sample_aspect_ratio * track->enc->width*0x10000);
             avio_wb32(pb, track->height*0x10000);

         }

     }
     else {

         avio_wb32(pb, 0);
         avio_wb32(pb, 0);

     }
     return 0x5c;
 }
 

 static int mov_write_tapt_tag(AVIOContext *pb, MOVTrack *track)

 {
     int32_t width = av_rescale(track->enc->sample_aspect_ratio.num, track->enc->width,
                                track->enc->sample_aspect_ratio.den);
 

     int64_t pos = avio_tell(pb);

 
     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "tapt");

 
     avio_wb32(pb, 20);

     ffio_wfourcc(pb, "clef");

     avio_wb32(pb, 0);

     avio_wb32(pb, width << 16);
     avio_wb32(pb, track->enc->height << 16);
 
     avio_wb32(pb, 20);
     ffio_wfourcc(pb, "prof");
     avio_wb32(pb, 0);

     avio_wb32(pb, width << 16);
     avio_wb32(pb, track->enc->height << 16);
 
     avio_wb32(pb, 20);

     ffio_wfourcc(pb, "enof");

     avio_wb32(pb, 0);
     avio_wb32(pb, track->enc->width << 16);
     avio_wb32(pb, track->enc->height << 16);
 

     return update_size(pb, pos);

 }

 // This box seems important for the psp playback ... without it the movie seems to hang

 static int mov_write_edts_tag(AVIOContext *pb, MOVTrack *track)

 {

     int64_t duration = av_rescale_rnd(track->track_duration, MOV_TIMESCALE,

                                       track->timescale, AV_ROUND_UP);
     int version = duration < INT32_MAX ? 0 : 1;
     int entry_size, entry_count, size;
     int64_t delay, start_ct = track->cluster[0].cts;
     delay = av_rescale_rnd(track->cluster[0].dts + start_ct, MOV_TIMESCALE,
                            track->timescale, AV_ROUND_DOWN);
     version |= delay < INT32_MAX ? 0 : 1;
 
     entry_size = (version == 1) ? 20 : 12;
     entry_count = 1 + (delay > 0);
     size = 24 + entry_count * entry_size;
 
     /* write the atom data */
     avio_wb32(pb, size);

     ffio_wfourcc(pb, "edts");

     avio_wb32(pb, size - 8);

     ffio_wfourcc(pb, "elst");

     avio_w8(pb, version);
     avio_wb24(pb, 0); /* flags */

     avio_wb32(pb, entry_count);
     if (delay > 0) { /* add an empty edit to delay presentation */
         if (version == 1) {
             avio_wb64(pb, delay);
             avio_wb64(pb, -1);
         } else {
             avio_wb32(pb, delay);
             avio_wb32(pb, -1);
         }
         avio_wb32(pb, 0x00010000);

     } else {

         av_assert0(av_rescale_rnd(track->cluster[0].dts, MOV_TIMESCALE, track->timescale, AV_ROUND_DOWN) <= 0);
         start_ct  = -FFMIN(track->cluster[0].dts, 0); //FFMIN needed due to rounding

         duration += delay;

     }

     /* duration */
     if (version == 1) {
         avio_wb64(pb, duration);
         avio_wb64(pb, start_ct);
     } else {
         avio_wb32(pb, duration);
         avio_wb32(pb, start_ct);
     }

     avio_wb32(pb, 0x00010000);

     return size;

 }
 

 static int mov_write_tref_tag(AVIOContext *pb, MOVTrack *track)

 {

     avio_wb32(pb, 20);   // size

     ffio_wfourcc(pb, "tref");

     avio_wb32(pb, 12);   // size (subatom)
     avio_wl32(pb, track->tref_tag);
     avio_wb32(pb, track->tref_id);

     return 20;
 }
 

 // goes at the end of each track!  ... Critical for PSP playback ("Incompatible data" without it)

 static int mov_write_uuid_tag_psp(AVIOContext *pb, MOVTrack *mov)

 {

     avio_wb32(pb, 0x34); /* size ... reports as 28 in mp4box! */

     ffio_wfourcc(pb, "uuid");
     ffio_wfourcc(pb, "USMT");

     avio_wb32(pb, 0x21d24fce);
     avio_wb32(pb, 0xbb88695c);
     avio_wb32(pb, 0xfac9c740);
     avio_wb32(pb, 0x1c);     // another size here!

     ffio_wfourcc(pb, "MTDT");

     avio_wb32(pb, 0x00010012);
     avio_wb32(pb, 0x0a);
     avio_wb32(pb, 0x55c40000);
     avio_wb32(pb, 0x1);
     avio_wb32(pb, 0x0);

     return 0x34;
 }
 

 static int mov_write_udta_sdp(AVIOContext *pb, MOVTrack *track)

 {

 
     AVFormatContext *ctx = track->rtp_ctx;

     char buf[1000] = "";
     int len;
 

     ff_sdp_write_media(buf, sizeof(buf), ctx->streams[0], track->src_track,
                        NULL, NULL, 0, 0, ctx);
     av_strlcatf(buf, sizeof(buf), "a=control:streamid=%d\r\n", track->track_id);

     len = strlen(buf);
 

     avio_wb32(pb, len + 24);

     ffio_wfourcc(pb, "udta");

     avio_wb32(pb, len + 16);

     ffio_wfourcc(pb, "hnti");

     avio_wb32(pb, len + 8);

     ffio_wfourcc(pb, "sdp ");

     avio_write(pb, buf, len);

     return len + 24;
 }
 

 static int mov_write_trak_tag(AVIOContext *pb, MOVMuxContext *mov,
                               MOVTrack *track, AVStream *st)

 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "trak");

     mov_write_tkhd_tag(pb, track, st);

     if (supports_edts(mov))

         mov_write_edts_tag(pb, track);  // PSP Movies and several other cases require edts box

     if (track->tref_tag)
         mov_write_tref_tag(pb, track);

     mov_write_mdia_tag(pb, track);

     if (track->mode == MODE_PSP)

         mov_write_uuid_tag_psp(pb,track);  // PSP Movies require this uuid box

     if (track->tag == MKTAG('r','t','p',' '))

         mov_write_udta_sdp(pb, track);

     if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO && track->mode == MODE_MOV) {
         double sample_aspect_ratio = av_q2d(st->sample_aspect_ratio);

         if (st->sample_aspect_ratio.num && 1.0 != sample_aspect_ratio)

             mov_write_tapt_tag(pb, track);
     };

     return update_size(pb, pos);

 }
 

 static int mov_write_iods_tag(AVIOContext *pb, MOVMuxContext *mov)

 {

     int i, has_audio = 0, has_video = 0;
     int64_t pos = avio_tell(pb);
     int audio_profile = mov->iods_audio_profile;
     int video_profile = mov->iods_video_profile;
     for (i = 0; i < mov->nb_streams; i++) {
         if(mov->tracks[i].entry > 0) {
             has_audio |= mov->tracks[i].enc->codec_type == AVMEDIA_TYPE_AUDIO;
             has_video |= mov->tracks[i].enc->codec_type == AVMEDIA_TYPE_VIDEO;
         }
     }
     if (audio_profile < 0)
         audio_profile = 0xFF - has_audio;
     if (video_profile < 0)
         video_profile = 0xFF - has_video;
     avio_wb32(pb, 0x0); /* size */

     ffio_wfourcc(pb, "iods");

     avio_wb32(pb, 0);    /* version & flags */

     put_descr(pb, 0x10, 7);

     avio_wb16(pb, 0x004f);
     avio_w8(pb, 0xff);
     avio_w8(pb, 0xff);
     avio_w8(pb, audio_profile);
     avio_w8(pb, video_profile);
     avio_w8(pb, 0xff);

     return update_size(pb, pos);

 }
 

 static int mov_write_trex_tag(AVIOContext *pb, MOVTrack *track)
 {
     avio_wb32(pb, 0x20); /* size */
     ffio_wfourcc(pb, "trex");
     avio_wb32(pb, 0);   /* version & flags */

     avio_wb32(pb, track->track_id); /* track ID */

     avio_wb32(pb, 1);   /* default sample description index */
     avio_wb32(pb, 0);   /* default sample duration */
     avio_wb32(pb, 0);   /* default sample size */
     avio_wb32(pb, 0);   /* default sample flags */
     return 0;
 }
 
 static int mov_write_mvex_tag(AVIOContext *pb, MOVMuxContext *mov)
 {
     int64_t pos = avio_tell(pb);
     int i;
     avio_wb32(pb, 0x0); /* size */
     ffio_wfourcc(pb, "mvex");
     for (i = 0; i < mov->nb_streams; i++)
         mov_write_trex_tag(pb, &mov->tracks[i]);

     return update_size(pb, pos);

 }
 

 static int mov_write_mvhd_tag(AVIOContext *pb, MOVMuxContext *mov)

 {

     int max_track_id = 1, i;
     int64_t max_track_len_temp, max_track_len = 0;

     int version;

     for (i=0; i<mov->nb_streams; i++) {

         if(mov->tracks[i].entry > 0) {

             max_track_len_temp = av_rescale_rnd(mov->tracks[i].track_duration,
                                                 MOV_TIMESCALE,
                                                 mov->tracks[i].timescale,
                                                 AV_ROUND_UP);
             if (max_track_len < max_track_len_temp)
                 max_track_len = max_track_len_temp;
             if (max_track_id < mov->tracks[i].track_id)
                 max_track_id = mov->tracks[i].track_id;

         }
     }

     version = max_track_len < UINT32_MAX ? 0 : 1;

     (version == 1) ? avio_wb32(pb, 120) : avio_wb32(pb, 108); /* size */

     ffio_wfourcc(pb, "mvhd");

     avio_w8(pb, version);
     avio_wb24(pb, 0); /* flags */

     if (version == 1) {

         avio_wb64(pb, mov->time);
         avio_wb64(pb, mov->time);

     } else {

         avio_wb32(pb, mov->time); /* creation time */
         avio_wb32(pb, mov->time); /* modification time */

     }

     avio_wb32(pb, MOV_TIMESCALE);

     (version == 1) ? avio_wb64(pb, max_track_len) : avio_wb32(pb, max_track_len); /* duration of longest track */

     avio_wb32(pb, 0x00010000); /* reserved (preferred rate) 1.0 = normal */
     avio_wb16(pb, 0x0100); /* reserved (preferred volume) 1.0 = normal */
     avio_wb16(pb, 0); /* reserved */
     avio_wb32(pb, 0); /* reserved */
     avio_wb32(pb, 0); /* reserved */

 
     /* Matrix structure */

     write_matrix(pb, 1, 0, 0, 1, 0, 0);

 
     avio_wb32(pb, 0); /* reserved (preview time) */
     avio_wb32(pb, 0); /* reserved (preview duration) */
     avio_wb32(pb, 0); /* reserved (poster time) */
     avio_wb32(pb, 0); /* reserved (selection time) */
     avio_wb32(pb, 0); /* reserved (selection duration) */
     avio_wb32(pb, 0); /* reserved (current time) */

     avio_wb32(pb, max_track_id + 1); /* Next track id */

     return 0x6c;
 }
 

 static int mov_write_itunes_hdlr_tag(AVIOContext *pb, MOVMuxContext *mov,

                                      AVFormatContext *s)
 {

     avio_wb32(pb, 33); /* size */

     ffio_wfourcc(pb, "hdlr");

     avio_wb32(pb, 0);
     avio_wb32(pb, 0);

     ffio_wfourcc(pb, "mdir");
     ffio_wfourcc(pb, "appl");

     avio_wb32(pb, 0);
     avio_wb32(pb, 0);
     avio_w8(pb, 0);

     return 33;

 }
 
 /* helper function to write a data tag with the specified string as data */

 static int mov_write_string_data_tag(AVIOContext *pb, const char *data, int lang, int long_style)

 {

     if(long_style){

         int size = 16 + strlen(data);

         avio_wb32(pb, size); /* size */

         ffio_wfourcc(pb, "data");

         avio_wb32(pb, 1);
         avio_wb32(pb, 0);
         avio_write(pb, data, strlen(data));

         return size;

     }else{

         if (!lang)
             lang = ff_mov_iso639_to_lang("und", 1);

         avio_wb16(pb, strlen(data)); /* string length */
         avio_wb16(pb, lang);
         avio_write(pb, data, strlen(data));

         return strlen(data) + 4;

     }
 }
 

 static int mov_write_string_tag(AVIOContext *pb, const char *name, const char *value, int lang, int long_style){

     int size = 0;

     if (value && value[0]) {

         int64_t pos = avio_tell(pb);

         avio_wb32(pb, 0); /* size */

         ffio_wfourcc(pb, name);

         mov_write_string_data_tag(pb, value, lang, long_style);

         size = update_size(pb, pos);

     }
     return size;
 }
 

 static int mov_write_string_metadata(AVFormatContext *s, AVIOContext *pb,

                                      const char *name, const char *tag,
                                      int long_style)

 {

     int l, lang = 0, len, len2;

     AVDictionaryEntry *t, *t2 = NULL;

     char tag2[16];

     if (!(t = av_dict_get(s->metadata, tag, NULL, 0)))

         return 0;

     len = strlen(t->key);
     snprintf(tag2, sizeof(tag2), "%s-", tag);

     while ((t2 = av_dict_get(s->metadata, tag2, t2, AV_DICT_IGNORE_SUFFIX))) {

         len2 = strlen(t2->key);
         if (len2 == len+4 && !strcmp(t->value, t2->value)

             && (l=ff_mov_iso639_to_lang(&t2->key[len2-3], 1)) >= 0) {

             lang = l;
             break;
         }
     }
     return mov_write_string_tag(pb, name, t->value, lang, long_style);

 }
 

 /* iTunes bpm number */
 static int mov_write_tmpo_tag(AVIOContext *pb, AVFormatContext *s)
 {
     AVDictionaryEntry *t = av_dict_get(s->metadata, "tmpo", NULL, 0);
     int size = 0, tmpo = t ? atoi(t->value) : 0;
     if (tmpo) {
         size = 26;
         avio_wb32(pb, size);
         ffio_wfourcc(pb, "tmpo");
         avio_wb32(pb, size-8); /* size */
         ffio_wfourcc(pb, "data");
         avio_wb32(pb, 0x15);  //type specifier
         avio_wb32(pb, 0);
         avio_wb16(pb, tmpo);        // data
     }
     return size;
 }
 

 /* iTunes track number */

 static int mov_write_trkn_tag(AVIOContext *pb, MOVMuxContext *mov,

                               AVFormatContext *s)
 {

     AVDictionaryEntry *t = av_dict_get(s->metadata, "track", NULL, 0);

     int size = 0, track = t ? atoi(t->value) : 0;
     if (track) {

         avio_wb32(pb, 32); /* size */

         ffio_wfourcc(pb, "trkn");

             avio_wb32(pb, 24); /* size */

             ffio_wfourcc(pb, "data");

             avio_wb32(pb, 0);        // 8 bytes empty
             avio_wb32(pb, 0);
             avio_wb16(pb, 0);        // empty
             avio_wb16(pb, track);    // track number
             avio_wb16(pb, 0);        // total track number
             avio_wb16(pb, 0);        // empty

         size = 32;

     }
     return size;
 }
 

 static int mov_write_int8_metadata(AVFormatContext *s, AVIOContext *pb,
                                    const char *name, const char *tag,
                                    int len)
 {
     AVDictionaryEntry *t = NULL;
     uint8_t num;
 
     if (!(t = av_dict_get(s->metadata, tag, NULL, 0)))
         return 0;

     num = atoi(t->value);

 
     avio_wb32(pb, len+8);
     ffio_wfourcc(pb, name);
     if (len==4) avio_wb32(pb, num);
     else        avio_w8 (pb, num);
     return len+8;
 }
 

 /* iTunes meta data list */

 static int mov_write_ilst_tag(AVIOContext *pb, MOVMuxContext *mov,

                               AVFormatContext *s)
 {

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "ilst");

     mov_write_string_metadata(s, pb, "\251nam", "title"    , 1);

     mov_write_string_metadata(s, pb, "\251ART", "artist"   , 1);

     mov_write_string_metadata(s, pb, "aART", "album_artist", 1);

     mov_write_string_metadata(s, pb, "\251wrt", "composer" , 1);

     mov_write_string_metadata(s, pb, "\251alb", "album"    , 1);

     mov_write_string_metadata(s, pb, "\251day", "date"     , 1);

     if (!mov_write_string_metadata(s, pb, "\251too", "encoding_tool", 1))
         mov_write_string_tag(pb, "\251too", LIBAVFORMAT_IDENT, 0, 1);

     mov_write_string_metadata(s, pb, "\251cmt", "comment"  , 1);
     mov_write_string_metadata(s, pb, "\251gen", "genre"    , 1);
     mov_write_string_metadata(s, pb, "\251cpy", "copyright", 1);

     mov_write_string_metadata(s, pb, "\251grp", "grouping" , 1);
     mov_write_string_metadata(s, pb, "\251lyr", "lyrics"   , 1);

     mov_write_string_metadata(s, pb, "desc",    "description",1);
     mov_write_string_metadata(s, pb, "ldes",    "synopsis" , 1);
     mov_write_string_metadata(s, pb, "tvsh",    "show"     , 1);
     mov_write_string_metadata(s, pb, "tven",    "episode_id",1);
     mov_write_string_metadata(s, pb, "tvnn",    "network"  , 1);

     mov_write_int8_metadata  (s, pb, "tves",    "episode_sort",4);
     mov_write_int8_metadata  (s, pb, "tvsn",    "season_number",4);
     mov_write_int8_metadata  (s, pb, "stik",    "media_type",1);
     mov_write_int8_metadata  (s, pb, "hdvd",    "hd_video",  1);
     mov_write_int8_metadata  (s, pb, "pgap",    "gapless_playback",1);

     mov_write_trkn_tag(pb, mov, s);

     mov_write_tmpo_tag(pb, s);

     return update_size(pb, pos);

 }
 
 /* iTunes meta data tag */

 static int mov_write_meta_tag(AVIOContext *pb, MOVMuxContext *mov,

                               AVFormatContext *s)
 {
     int size = 0;

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "meta");

     avio_wb32(pb, 0);

     mov_write_itunes_hdlr_tag(pb, mov, s);
     mov_write_ilst_tag(pb, mov, s);

     size = update_size(pb, pos);

     return size;
 }

 static int utf8len(const uint8_t *b)
 {
     int len=0;
     int val;
     while(*b){
         GET_UTF8(val, *b++, return -1;)
         len++;
     }
     return len;
 }
 

 static int ascii_to_wc(AVIOContext *pb, const uint8_t *b)

 {
     int val;
     while(*b){
         GET_UTF8(val, *b++, return -1;)

         avio_wb16(pb, val);

     }

     avio_wb16(pb, 0x00);

     return 0;
 }
 
 static uint16_t language_code(const char *str)
 {
     return (((str[0]-0x60) & 0x1F) << 10) + (((str[1]-0x60) & 0x1F) << 5) + ((str[2]-0x60) & 0x1F);
 }
 

 static int mov_write_3gp_udta_tag(AVIOContext *pb, AVFormatContext *s,

                                   const char *tag, const char *str)
 {

     int64_t pos = avio_tell(pb);

     AVDictionaryEntry *t = av_dict_get(s->metadata, str, NULL, 0);

     if (!t || !utf8len(t->value))

         return 0;

     avio_wb32(pb, 0);   /* size */

     ffio_wfourcc(pb, tag); /* type */

     avio_wb32(pb, 0);   /* version + flags */

     if (!strcmp(tag, "yrrc"))

         avio_wb16(pb, atoi(t->value));

     else {

         avio_wb16(pb, language_code("eng")); /* language */
         avio_write(pb, t->value, strlen(t->value)+1); /* UTF8 string value */

         if (!strcmp(tag, "albm") &&

             (t = av_dict_get(s->metadata, "track", NULL, 0)))

             avio_w8(pb, atoi(t->value));

     }

     return update_size(pb, pos);

 }
 

 static int mov_write_chpl_tag(AVIOContext *pb, AVFormatContext *s)

 {

     int64_t pos = avio_tell(pb);

     int i, nb_chapters = FFMIN(s->nb_chapters, 255);
 

     avio_wb32(pb, 0);            // size

     ffio_wfourcc(pb, "chpl");

     avio_wb32(pb, 0x01000000);   // version + flags
     avio_wb32(pb, 0);            // unknown
     avio_w8(pb, nb_chapters);

 
     for (i = 0; i < nb_chapters; i++) {
         AVChapter *c = s->chapters[i];

         AVDictionaryEntry *t;

         avio_wb64(pb, av_rescale_q(c->start, c->time_base, (AVRational){1,10000000}));

         if ((t = av_dict_get(c->metadata, "title", NULL, 0))) {

             int len = FFMIN(strlen(t->value), 255);

             avio_w8(pb, len);
             avio_write(pb, t->value, len);

         } else

             avio_w8(pb, 0);

     }

     return update_size(pb, pos);

 }
 

 static int mov_write_udta_tag(AVIOContext *pb, MOVMuxContext *mov,

                               AVFormatContext *s)
 {

     AVIOContext *pb_buf;

     int i, ret, size;
     uint8_t *buf;

     for (i = 0; i < s->nb_streams; i++)
         if (mov->tracks[i].enc->flags & CODEC_FLAG_BITEXACT) {

             return 0;

         }
 

     ret = avio_open_dyn_buf(&pb_buf);

     if(ret < 0)
         return ret;

     if (mov->mode & MODE_3GP) {
         mov_write_3gp_udta_tag(pb_buf, s, "perf", "artist");
         mov_write_3gp_udta_tag(pb_buf, s, "titl", "title");
         mov_write_3gp_udta_tag(pb_buf, s, "auth", "author");
         mov_write_3gp_udta_tag(pb_buf, s, "gnre", "genre");
         mov_write_3gp_udta_tag(pb_buf, s, "dscp", "comment");
         mov_write_3gp_udta_tag(pb_buf, s, "albm", "album");
         mov_write_3gp_udta_tag(pb_buf, s, "cprt", "copyright");
         mov_write_3gp_udta_tag(pb_buf, s, "yrrc", "date");
     } else if (mov->mode == MODE_MOV) { // the title field breaks gtkpod with mp4 and my suspicion is that stuff is not valid in mp4
         mov_write_string_metadata(s, pb_buf, "\251ART", "artist"     , 0);
         mov_write_string_metadata(s, pb_buf, "\251nam", "title"      , 0);
         mov_write_string_metadata(s, pb_buf, "\251aut", "author"     , 0);
         mov_write_string_metadata(s, pb_buf, "\251alb", "album"      , 0);
         mov_write_string_metadata(s, pb_buf, "\251day", "date"       , 0);
         mov_write_string_metadata(s, pb_buf, "\251swr", "encoder"    , 0);

         // currently ignored by mov.c

         mov_write_string_metadata(s, pb_buf, "\251des", "comment"    , 0);

         // add support for libquicktime, this atom is also actually read by mov.c
         mov_write_string_metadata(s, pb_buf, "\251cmt", "comment"    , 0);

         mov_write_string_metadata(s, pb_buf, "\251gen", "genre"      , 0);
         mov_write_string_metadata(s, pb_buf, "\251cpy", "copyright"  , 0);
     } else {
         /* iTunes meta data */
         mov_write_meta_tag(pb_buf, mov, s);
     }

     if (s->nb_chapters)
         mov_write_chpl_tag(pb_buf, s);

     if ((size = avio_close_dyn_buf(pb_buf, &buf)) > 0) {

         avio_wb32(pb, size+8);

         ffio_wfourcc(pb, "udta");

         avio_write(pb, buf, size);

     }

     av_free(buf);

 
     return 0;

 }
 

 static void mov_write_psp_udta_tag(AVIOContext *pb,

                                   const char *str, const char *lang, int type)
 {
     int len = utf8len(str)+1;
     if(len<=0)

         return;

     avio_wb16(pb, len*2+10);            /* size */
     avio_wb32(pb, type);                /* type */
     avio_wb16(pb, language_code(lang)); /* language */
     avio_wb16(pb, 0x01);                /* ? */

     ascii_to_wc(pb, str);
 }
 

 static int mov_write_uuidusmt_tag(AVIOContext *pb, AVFormatContext *s)

 {

     AVDictionaryEntry *title = av_dict_get(s->metadata, "title", NULL, 0);

     int64_t pos, pos2;

     if (title) {

         pos = avio_tell(pb);

         avio_wb32(pb, 0); /* size placeholder*/

         ffio_wfourcc(pb, "uuid");
         ffio_wfourcc(pb, "USMT");

         avio_wb32(pb, 0x21d24fce); /* 96 bit UUID */
         avio_wb32(pb, 0xbb88695c);
         avio_wb32(pb, 0xfac9c740);

         pos2 = avio_tell(pb);

         avio_wb32(pb, 0); /* size placeholder*/

         ffio_wfourcc(pb, "MTDT");

         avio_wb16(pb, 4);

         // ?

         avio_wb16(pb, 0x0C);                 /* size */
         avio_wb32(pb, 0x0B);                 /* type */
         avio_wb16(pb, language_code("und")); /* language */
         avio_wb16(pb, 0x0);                  /* ? */
         avio_wb16(pb, 0x021C);               /* data */

         mov_write_psp_udta_tag(pb, LIBAVCODEC_IDENT,      "eng", 0x04);

         mov_write_psp_udta_tag(pb, title->value,          "eng", 0x01);

         mov_write_psp_udta_tag(pb, "2006/04/01 11:11:11", "und", 0x03);
 

         update_size(pb, pos2);
         return update_size(pb, pos);

     }
 

     return 0;

 }
 

 static void build_chunks(MOVTrack *trk)
 {
     int i;
     MOVIentry *chunk= &trk->cluster[0];

     uint64_t chunkSize = chunk->size;

     chunk->chunkNum= 1;

     if (trk->chunkCount)
         return;

     trk->chunkCount= 1;
     for(i=1; i<trk->entry; i++){

         if(chunk->pos + chunkSize == trk->cluster[i].pos &&

             chunkSize + trk->cluster[i].size < (1<<20)){

             chunkSize             += trk->cluster[i].size;

             chunk->samples_in_chunk += trk->cluster[i].entries;

         }else{
             trk->cluster[i].chunkNum = chunk->chunkNum+1;
             chunk=&trk->cluster[i];

             chunkSize = chunk->size;

             trk->chunkCount++;
         }
     }
 }
 

 static int mov_write_moov_tag(AVIOContext *pb, MOVMuxContext *mov,

                               AVFormatContext *s)

 {

     int i;

     int64_t pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size placeholder*/

     ffio_wfourcc(pb, "moov");

     for (i=0; i<mov->nb_streams; i++) {

         if (mov->tracks[i].entry <= 0 && !(mov->flags & FF_MOV_FLAG_FRAGMENT))
             continue;

 
         mov->tracks[i].time = mov->time;

         mov->tracks[i].track_id = i+1;

         if (mov->tracks[i].entry)
             build_chunks(&mov->tracks[i]);

     }
 

     if (mov->chapter_track)
         for (i=0; i<s->nb_streams; i++) {
             mov->tracks[i].tref_tag = MKTAG('c','h','a','p');

             mov->tracks[i].tref_id = mov->tracks[mov->chapter_track].track_id;

         }

     for (i = 0; i < mov->nb_streams; i++) {
         if (mov->tracks[i].tag == MKTAG('r','t','p',' ')) {
             mov->tracks[i].tref_tag = MKTAG('h','i','n','t');
             mov->tracks[i].tref_id =

                 mov->tracks[mov->tracks[i].src_track].track_id;

         }
     }

     for (i = 0; i < mov->nb_streams; i++) {
         if (mov->tracks[i].tag == MKTAG('t','m','c','d')) {
             int src_trk = mov->tracks[i].src_track;
             mov->tracks[src_trk].tref_tag = mov->tracks[i].tag;
             mov->tracks[src_trk].tref_id  = mov->tracks[i].track_id;
             mov->tracks[i].track_duration = mov->tracks[src_trk].track_duration;
         }
     }

     mov_write_mvhd_tag(pb, mov);

     if (mov->mode != MODE_MOV && !mov->iods_skip)
         mov_write_iods_tag(pb, mov);

     for (i=0; i<mov->nb_streams; i++) {

         if (mov->tracks[i].entry > 0 || mov->flags & FF_MOV_FLAG_FRAGMENT) {

             mov_write_trak_tag(pb, mov, &(mov->tracks[i]), i < s->nb_streams ? s->streams[i] : NULL);

         }
     }

     if (mov->flags & FF_MOV_FLAG_FRAGMENT)
         mov_write_mvex_tag(pb, mov); /* QuickTime requires trak to precede this */

     if (mov->mode == MODE_PSP)
         mov_write_uuidusmt_tag(pb, s);

     else

         mov_write_udta_tag(pb, mov, s);

     return update_size(pb, pos);

 }
 

 static void param_write_int(AVIOContext *pb, const char *name, int value)
 {
     avio_printf(pb, "<param name=\"%s\" value=\"%d\" valuetype=\"data\"/>\n", name, value);
 }
 
 static void param_write_string(AVIOContext *pb, const char *name, const char *value)
 {
     avio_printf(pb, "<param name=\"%s\" value=\"%s\" valuetype=\"data\"/>\n", name, value);
 }
 
 static void param_write_hex(AVIOContext *pb, const char *name, const uint8_t *value, int len)
 {
     char buf[150];
     len = FFMIN(sizeof(buf)/2 - 1, len);
     ff_data_to_hex(buf, value, len, 0);
     buf[2*len] = '\0';
     avio_printf(pb, "<param name=\"%s\" value=\"%s\" valuetype=\"data\"/>\n", name, buf);
 }
 
 static int mov_write_isml_manifest(AVIOContext *pb, MOVMuxContext *mov)
 {
     int64_t pos = avio_tell(pb);
     int i;
     const uint8_t uuid[] = {
         0xa5, 0xd4, 0x0b, 0x30, 0xe8, 0x14, 0x11, 0xdd,
         0xba, 0x2f, 0x08, 0x00, 0x20, 0x0c, 0x9a, 0x66
     };
 
     avio_wb32(pb, 0);
     ffio_wfourcc(pb, "uuid");
     avio_write(pb, uuid, sizeof(uuid));
     avio_wb32(pb, 0);
 
     avio_printf(pb, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n");
     avio_printf(pb, "<smil xmlns=\"http://www.w3.org/2001/SMIL20/Language\">\n");
     avio_printf(pb, "<head>\n");
     avio_printf(pb, "<meta name=\"creator\" content=\"%s\" />\n",
                     LIBAVFORMAT_IDENT);
     avio_printf(pb, "</head>\n");
     avio_printf(pb, "<body>\n");
     avio_printf(pb, "<switch>\n");
     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         const char *type;

         /* track->track_id is initialized in write_moov, and thus isn't known

          * here yet */
         int track_id = i + 1;
 
         if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) {
             type = "video";
         } else if (track->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
             type = "audio";
         } else {
             continue;
         }
         avio_printf(pb, "<%s systemBitrate=\"%d\">\n", type,
                                                        track->enc->bit_rate);
         param_write_int(pb, "systemBitrate", track->enc->bit_rate);
         param_write_int(pb, "trackID", track_id);
         if (track->enc->codec_type == AVMEDIA_TYPE_VIDEO) {

             if (track->enc->codec_id == AV_CODEC_ID_H264) {

                 uint8_t *ptr;
                 int size = track->enc->extradata_size;
                 if (!ff_avc_write_annexb_extradata(track->enc->extradata, &ptr,
                                                    &size)) {
                     param_write_hex(pb, "CodecPrivateData",
                                     ptr ? ptr : track->enc->extradata,
                                     size);
                     av_free(ptr);
                 }

                 param_write_string(pb, "FourCC", "H264");

             } else if (track->enc->codec_id == AV_CODEC_ID_VC1) {

                 param_write_string(pb, "FourCC", "WVC1");

                 param_write_hex(pb, "CodecPrivateData", track->enc->extradata,
                                 track->enc->extradata_size);

             }
             param_write_int(pb, "MaxWidth", track->enc->width);
             param_write_int(pb, "MaxHeight", track->enc->height);
             param_write_int(pb, "DisplayWidth", track->enc->width);
             param_write_int(pb, "DisplayHeight", track->enc->height);
         } else {

             if (track->enc->codec_id == AV_CODEC_ID_AAC) {

                 param_write_string(pb, "FourCC", "AACL");

             } else if (track->enc->codec_id == AV_CODEC_ID_WMAPRO) {

                 param_write_string(pb, "FourCC", "WMAP");
             }
             param_write_hex(pb, "CodecPrivateData", track->enc->extradata,
                             track->enc->extradata_size);
             param_write_int(pb, "AudioTag", ff_codec_get_tag(ff_codec_wav_tags,
                                                 track->enc->codec_id));
             param_write_int(pb, "Channels", track->enc->channels);
             param_write_int(pb, "SamplingRate", track->enc->sample_rate);
             param_write_int(pb, "BitsPerSample", 16);
             param_write_int(pb, "PacketSize", track->enc->block_align ?
                                               track->enc->block_align : 4);
         }
         avio_printf(pb, "</%s>\n", type);
     }
     avio_printf(pb, "</switch>\n");
     avio_printf(pb, "</body>\n");
     avio_printf(pb, "</smil>\n");
 

     return update_size(pb, pos);

 }
 

 static int mov_write_mfhd_tag(AVIOContext *pb, MOVMuxContext *mov)
 {

     avio_wb32(pb, 16);

     ffio_wfourcc(pb, "mfhd");
     avio_wb32(pb, 0);

     avio_wb32(pb, mov->fragments);
     return 0;
 }
 
 static int mov_write_tfhd_tag(AVIOContext *pb, MOVTrack *track,
                               int64_t moof_offset)
 {
     int64_t pos = avio_tell(pb);

     uint32_t flags = MOV_TFHD_DEFAULT_SIZE | MOV_TFHD_DEFAULT_DURATION |
                      MOV_TFHD_BASE_DATA_OFFSET;

     if (!track->entry) {

         flags |= MOV_TFHD_DURATION_IS_EMPTY;

     } else {

         flags |= MOV_TFHD_DEFAULT_FLAGS;

     }

     /* Don't set a default sample size, the silverlight player refuses
      * to play files with that set. Don't set a default sample duration,
      * WMP freaks out if it is set. */

     if (track->mode == MODE_ISM)

         flags &= ~(MOV_TFHD_DEFAULT_SIZE | MOV_TFHD_DEFAULT_DURATION);

     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "tfhd");
     avio_w8(pb, 0); /* version */
     avio_wb24(pb, flags);
 

     avio_wb32(pb, track->track_id); /* track-id */

     if (flags & MOV_TFHD_BASE_DATA_OFFSET)

         avio_wb64(pb, moof_offset);

     if (flags & MOV_TFHD_DEFAULT_DURATION) {

         track->default_duration = get_cluster_duration(track, 0);

         avio_wb32(pb, track->default_duration);
     }

     if (flags & MOV_TFHD_DEFAULT_SIZE) {

         track->default_size = track->entry ? track->cluster[0].size : 1;
         avio_wb32(pb, track->default_size);
     } else
         track->default_size = -1;
 

     if (flags & MOV_TFHD_DEFAULT_FLAGS) {

         track->default_sample_flags =
             track->enc->codec_type == AVMEDIA_TYPE_VIDEO ?

             (MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES | MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC) :
             MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO;

         avio_wb32(pb, track->default_sample_flags);
     }
 

     return update_size(pb, pos);

 }
 

 static uint32_t get_sample_flags(MOVTrack *track, MOVIentry *entry)

 {

     return entry->flags & MOV_SYNC_SAMPLE ? MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO :
            (MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES | MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC);

 }
 
 static int mov_write_trun_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);

     uint32_t flags = MOV_TRUN_DATA_OFFSET;

     int i;

 
     for (i = 0; i < track->entry; i++) {

         if (get_cluster_duration(track, i) != track->default_duration)

             flags |= MOV_TRUN_SAMPLE_DURATION;

         if (track->cluster[i].size != track->default_size)

             flags |= MOV_TRUN_SAMPLE_SIZE;

         if (i > 0 && get_sample_flags(track, &track->cluster[i]) != track->default_sample_flags)

             flags |= MOV_TRUN_SAMPLE_FLAGS;

     }

     if (!(flags & MOV_TRUN_SAMPLE_FLAGS))
         flags |= MOV_TRUN_FIRST_SAMPLE_FLAGS;

     if (track->flags & MOV_TRACK_CTTS)

         flags |= MOV_TRUN_SAMPLE_CTS;

 
     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "trun");
     avio_w8(pb, 0); /* version */
     avio_wb24(pb, flags);
 
     avio_wb32(pb, track->entry); /* sample count */
     track->moof_size_offset = avio_tell(pb);
     avio_wb32(pb, 0); /* data offset */

     if (flags & MOV_TRUN_FIRST_SAMPLE_FLAGS)

         avio_wb32(pb, get_sample_flags(track, &track->cluster[0]));
 
     for (i = 0; i < track->entry; i++) {

         if (flags & MOV_TRUN_SAMPLE_DURATION)

             avio_wb32(pb, get_cluster_duration(track, i));

         if (flags & MOV_TRUN_SAMPLE_SIZE)

             avio_wb32(pb, track->cluster[i].size);

         if (flags & MOV_TRUN_SAMPLE_FLAGS)

             avio_wb32(pb, get_sample_flags(track, &track->cluster[i]));

         if (flags & MOV_TRUN_SAMPLE_CTS)

             avio_wb32(pb, track->cluster[i].cts);
     }
 

     return update_size(pb, pos);

 }
 

 static int mov_write_tfxd_tag(AVIOContext *pb, MOVTrack *track)
 {

     int64_t pos = avio_tell(pb);

     const uint8_t uuid[] = {
         0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
         0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2
     };
 
     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "uuid");
     avio_write(pb, uuid, sizeof(uuid));
     avio_w8(pb, 1);
     avio_wb24(pb, 0);
     avio_wb64(pb, track->frag_start);

     avio_wb64(pb, track->start_dts + track->track_duration -

                   track->cluster[0].dts);
 

     return update_size(pb, pos);

 }
 
 static int mov_write_tfrf_tag(AVIOContext *pb, MOVMuxContext *mov,
                               MOVTrack *track, int entry)
 {
     int n = track->nb_frag_info - 1 - entry, i;
     int size = 8 + 16 + 4 + 1 + 16*n;
     const uint8_t uuid[] = {
         0xd4, 0x80, 0x7e, 0xf2, 0xca, 0x39, 0x46, 0x95,
         0x8e, 0x54, 0x26, 0xcb, 0x9e, 0x46, 0xa7, 0x9f
     };
 
     if (entry < 0)
         return 0;
 
     avio_seek(pb, track->frag_info[entry].tfrf_offset, SEEK_SET);
     avio_wb32(pb, size);
     ffio_wfourcc(pb, "uuid");
     avio_write(pb, uuid, sizeof(uuid));
     avio_w8(pb, 1);
     avio_wb24(pb, 0);
     avio_w8(pb, n);
     for (i = 0; i < n; i++) {
         int index = entry + 1 + i;
         avio_wb64(pb, track->frag_info[index].time);
         avio_wb64(pb, track->frag_info[index].duration);
     }
     if (n < mov->ism_lookahead) {
         int free_size = 16*(mov->ism_lookahead - n);
         avio_wb32(pb, free_size);
         ffio_wfourcc(pb, "free");
         for (i = 0; i < free_size - 8; i++)
             avio_w8(pb, 0);
     }
 
     return 0;
 }
 
 static int mov_write_tfrf_tags(AVIOContext *pb, MOVMuxContext *mov,
                                MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);
     int i;
     for (i = 0; i < mov->ism_lookahead; i++) {
         /* Update the tfrf tag for the last ism_lookahead fragments,
          * nb_frag_info - 1 is the next fragment to be written. */
         mov_write_tfrf_tag(pb, mov, track, track->nb_frag_info - 2 - i);
     }
     avio_seek(pb, pos, SEEK_SET);
     return 0;
 }
 
 static int mov_write_traf_tag(AVIOContext *pb, MOVMuxContext *mov,
                               MOVTrack *track, int64_t moof_offset)

 {
     int64_t pos = avio_tell(pb);
     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "traf");
 
     mov_write_tfhd_tag(pb, track, moof_offset);
     mov_write_trun_tag(pb, track);

     if (mov->mode == MODE_ISM) {
         mov_write_tfxd_tag(pb, track);
 
         if (mov->ism_lookahead) {
             int i, size = 16 + 4 + 1 + 16*mov->ism_lookahead;
 
             track->tfrf_offset = avio_tell(pb);
             avio_wb32(pb, 8 + size);
             ffio_wfourcc(pb, "free");
             for (i = 0; i < size; i++)
                 avio_w8(pb, 0);
         }
     }

     return update_size(pb, pos);

 }
 
 static int mov_write_moof_tag(AVIOContext *pb, MOVMuxContext *mov, int tracks)
 {
     int64_t pos = avio_tell(pb), end;
     int i, moof_size;
 
     avio_wb32(pb, 0); /* size placeholder */

     ffio_wfourcc(pb, "moof");
 
     mov_write_mfhd_tag(pb, mov);

     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         if (tracks >= 0 && i != tracks)
             continue;
         if (!track->entry)
             continue;

         mov_write_traf_tag(pb, mov, track, pos);

     }
 
     end = avio_tell(pb);
     moof_size = end - pos;
     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         if (tracks >= 0 && i != tracks)
             continue;
         if (!track->entry)
             continue;
         avio_seek(pb, mov->tracks[i].moof_size_offset, SEEK_SET);
         avio_wb32(pb, moof_size + 8 + mov->tracks[i].data_offset);

     }

     avio_seek(pb, end, SEEK_SET);
 

     return update_size(pb, pos);

 }
 
 static int mov_write_tfra_tag(AVIOContext *pb, MOVTrack *track)
 {
     int64_t pos = avio_tell(pb);
     int i;
 
     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "tfra");
     avio_w8(pb, 1); /* version */
     avio_wb24(pb, 0);
 

     avio_wb32(pb, track->track_id);

     avio_wb32(pb, 0); /* length of traf/trun/sample num */
     avio_wb32(pb, track->nb_frag_info);
     for (i = 0; i < track->nb_frag_info; i++) {
         avio_wb64(pb, track->frag_info[i].time);
         avio_wb64(pb, track->frag_info[i].offset);
         avio_w8(pb, 1); /* traf number */
         avio_w8(pb, 1); /* trun number */
         avio_w8(pb, 1); /* sample number */
     }
 

     return update_size(pb, pos);

 }
 
 static int mov_write_mfra_tag(AVIOContext *pb, MOVMuxContext *mov)
 {
     int64_t pos = avio_tell(pb);
     int i;
 
     avio_wb32(pb, 0); /* size placeholder */
     ffio_wfourcc(pb, "mfra");

     /* An empty mfra atom is enough to indicate to the publishing point that
      * the stream has ended. */
     if (mov->flags & FF_MOV_FLAG_ISML)

         return update_size(pb, pos);

 
     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         if (track->nb_frag_info)
             mov_write_tfra_tag(pb, track);
     }
 
     avio_wb32(pb, 16);
     ffio_wfourcc(pb, "mfro");
     avio_wb32(pb, 0); /* version + flags */
     avio_wb32(pb, avio_tell(pb) + 4 - pos);

     return update_size(pb, pos);

 }
 

 static int mov_write_mdat_tag(AVIOContext *pb, MOVMuxContext *mov)

 {

     avio_wb32(pb, 8);    // placeholder for extended size field (64 bit)

     ffio_wfourcc(pb, mov->mode == MODE_MOV ? "wide" : "free");

     mov->mdat_pos = avio_tell(pb);

     avio_wb32(pb, 0); /* size placeholder*/

     ffio_wfourcc(pb, "mdat");

     return 0;
 }
 
 /* TODO: This needs to be more general */

 static int mov_write_ftyp_tag(AVIOContext *pb, AVFormatContext *s)

 {

     MOVMuxContext *mov = s->priv_data;

     int64_t pos = avio_tell(pb);

     int has_h264 = 0, has_video = 0;

     int minor = 0x200;

     int i;

     for (i = 0; i < s->nb_streams; i++) {
         AVStream *st = s->streams[i];

         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)

             has_video = 1;

         if (st->codec->codec_id == AV_CODEC_ID_H264)

             has_h264 = 1;
     }
 

     avio_wb32(pb, 0); /* size */

     ffio_wfourcc(pb, "ftyp");

     if (mov->mode == MODE_3GP) {

         ffio_wfourcc(pb, has_h264 ? "3gp6"  : "3gp4");

         minor =     has_h264 ?   0x100 :   0x200;
     } else if (mov->mode & MODE_3G2) {

         ffio_wfourcc(pb, has_h264 ? "3g2b"  : "3g2a");

         minor =     has_h264 ? 0x20000 : 0x10000;
     }else if (mov->mode == MODE_PSP)

         ffio_wfourcc(pb, "MSNV");

     else if (mov->mode == MODE_MP4)

         ffio_wfourcc(pb, "isom");

     else if (mov->mode == MODE_IPOD)

         ffio_wfourcc(pb, has_video ? "M4V ":"M4A ");

     else if (mov->mode == MODE_ISM)
         ffio_wfourcc(pb, "isml");

     else if (mov->mode == MODE_F4V)
         ffio_wfourcc(pb, "f4v ");

     else

         ffio_wfourcc(pb, "qt  ");

     avio_wb32(pb, minor);

     if(mov->mode == MODE_MOV)

         ffio_wfourcc(pb, "qt  ");

     else if (mov->mode == MODE_ISM) {
         ffio_wfourcc(pb, "piff");
         ffio_wfourcc(pb, "iso2");
     } else {

         ffio_wfourcc(pb, "isom");
         ffio_wfourcc(pb, "iso2");

         if(has_h264)

             ffio_wfourcc(pb, "avc1");

     }

     if (mov->mode == MODE_3GP)

         ffio_wfourcc(pb, has_h264 ? "3gp6":"3gp4");

     else if (mov->mode & MODE_3G2)

         ffio_wfourcc(pb, has_h264 ? "3g2b":"3g2a");

     else if (mov->mode == MODE_PSP)

         ffio_wfourcc(pb, "MSNV");

     else if (mov->mode == MODE_MP4)

         ffio_wfourcc(pb, "mp41");

     return update_size(pb, pos);

 }
 

 static void mov_write_uuidprof_tag(AVIOContext *pb, AVFormatContext *s)

 {

     AVCodecContext *video_codec = s->streams[0]->codec;
     AVCodecContext *audio_codec = s->streams[1]->codec;
     int audio_rate = audio_codec->sample_rate;
     int frame_rate = ((video_codec->time_base.den) * (0x10000))/ (video_codec->time_base.num);
     int audio_kbitrate = audio_codec->bit_rate / 1000;
     int video_kbitrate = FFMIN(video_codec->bit_rate / 1000, 800 - audio_kbitrate);

     avio_wb32(pb, 0x94); /* size */

     ffio_wfourcc(pb, "uuid");
     ffio_wfourcc(pb, "PROF");

     avio_wb32(pb, 0x21d24fce); /* 96 bit UUID */
     avio_wb32(pb, 0xbb88695c);
     avio_wb32(pb, 0xfac9c740);

     avio_wb32(pb, 0x0);  /* ? */
     avio_wb32(pb, 0x3);  /* 3 sections ? */

     avio_wb32(pb, 0x14); /* size */

     ffio_wfourcc(pb, "FPRF");

     avio_wb32(pb, 0x0);  /* ? */
     avio_wb32(pb, 0x0);  /* ? */
     avio_wb32(pb, 0x0);  /* ? */

     avio_wb32(pb, 0x2c);  /* size */

     ffio_wfourcc(pb, "APRF");/* audio */

     avio_wb32(pb, 0x0);
     avio_wb32(pb, 0x2);   /* TrackID */

     ffio_wfourcc(pb, "mp4a");

     avio_wb32(pb, 0x20f);
     avio_wb32(pb, 0x0);
     avio_wb32(pb, audio_kbitrate);
     avio_wb32(pb, audio_kbitrate);

     avio_wb32(pb, audio_rate);
     avio_wb32(pb, audio_codec->channels);

 
     avio_wb32(pb, 0x34);  /* size */

     ffio_wfourcc(pb, "VPRF");   /* video */

     avio_wb32(pb, 0x0);
     avio_wb32(pb, 0x1);    /* TrackID */

     if (video_codec->codec_id == AV_CODEC_ID_H264) {

         ffio_wfourcc(pb, "avc1");

         avio_wb16(pb, 0x014D);
         avio_wb16(pb, 0x0015);

     } else {

         ffio_wfourcc(pb, "mp4v");

         avio_wb16(pb, 0x0000);
         avio_wb16(pb, 0x0103);

     }

     avio_wb32(pb, 0x0);
     avio_wb32(pb, video_kbitrate);
     avio_wb32(pb, video_kbitrate);

     avio_wb32(pb, frame_rate);
     avio_wb32(pb, frame_rate);
     avio_wb16(pb, video_codec->width);
     avio_wb16(pb, video_codec->height);

     avio_wb32(pb, 0x010001); /* ? */

 }
 

 static int mov_parse_mpeg2_frame(AVPacket *pkt, uint32_t *flags)
 {
     uint32_t c = -1;
     int i, closed_gop = 0;
 
     for (i = 0; i < pkt->size - 4; i++) {
         c = (c<<8) + pkt->data[i];
         if (c == 0x1b8) { // gop
             closed_gop = pkt->data[i+4]>>6 & 0x01;
         } else if (c == 0x100) { // pic
             int temp_ref = (pkt->data[i+1]<<2) | (pkt->data[i+2]>>6);
             if (!temp_ref || closed_gop) // I picture is not reordered
                 *flags = MOV_SYNC_SAMPLE;
             else
                 *flags = MOV_PARTIAL_SYNC_SAMPLE;
             break;
         }
     }
     return 0;
 }
 

 static void mov_parse_vc1_frame(AVPacket *pkt, MOVTrack *trk, int fragment)
 {
     const uint8_t *start, *next, *end = pkt->data + pkt->size;
     int seq = 0, entry = 0;
     int key = pkt->flags & AV_PKT_FLAG_KEY;
     start = find_next_marker(pkt->data, end);
     for (next = start; next < end; start = next) {
         next = find_next_marker(start + 4, end);
         switch (AV_RB32(start)) {
         case VC1_CODE_SEQHDR:
             seq = 1;
             break;
         case VC1_CODE_ENTRYPOINT:
             entry = 1;
             break;
         case VC1_CODE_SLICE:
             trk->vc1_info.slices = 1;
             break;
         }
     }
     if (!trk->entry && !fragment) {
         /* First packet in first fragment */
         trk->vc1_info.first_packet_seq   = seq;
         trk->vc1_info.first_packet_entry = entry;
     } else if ((seq && !trk->vc1_info.packet_seq) ||
                (entry && !trk->vc1_info.packet_entry)) {
         int i;
         for (i = 0; i < trk->entry; i++)
             trk->cluster[i].flags &= ~MOV_SYNC_SAMPLE;
         trk->has_keyframes = 0;
         if (seq)
             trk->vc1_info.packet_seq = 1;
         if (entry)
             trk->vc1_info.packet_entry = 1;
         if (!fragment) {
             /* First fragment */
             if ((!seq   || trk->vc1_info.first_packet_seq) &&
                 (!entry || trk->vc1_info.first_packet_entry)) {
                 /* First packet had the same headers as this one, readd the
                  * sync sample flag. */
                 trk->cluster[0].flags |= MOV_SYNC_SAMPLE;
                 trk->has_keyframes = 1;
             }
         }
     }
     if (trk->vc1_info.packet_seq && trk->vc1_info.packet_entry)
         key = seq && entry;
     else if (trk->vc1_info.packet_seq)
         key = seq;
     else if (trk->vc1_info.packet_entry)
         key = entry;
     if (key) {
         trk->cluster[trk->entry].flags |= MOV_SYNC_SAMPLE;
         trk->has_keyframes++;
     }
 }
 

 static int get_moov_size(AVFormatContext *s)
 {
     int ret;
     uint8_t *buf;
     AVIOContext *moov_buf;
     MOVMuxContext *mov = s->priv_data;
 
     if ((ret = avio_open_dyn_buf(&moov_buf)) < 0)
         return ret;
     mov_write_moov_tag(moov_buf, mov, s);
     ret = avio_close_dyn_buf(moov_buf, &buf);
     av_free(buf);
     return ret;
 }
 

 static int mov_flush_fragment(AVFormatContext *s)
 {

     MOVMuxContext *mov = s->priv_data;

     int i, first_track = -1;
     int64_t mdat_size = 0;

     if (!(mov->flags & FF_MOV_FLAG_FRAGMENT))
         return 0;
 
     if (!(mov->flags & FF_MOV_FLAG_EMPTY_MOOV) && mov->fragments == 0) {
         int64_t pos = avio_tell(s->pb);

         uint8_t *buf;

         int buf_size, moov_size;

 
         for (i = 0; i < mov->nb_streams; i++)
             if (!mov->tracks[i].entry)
                 break;
         /* Don't write the initial moov unless all tracks have data */
         if (i < mov->nb_streams)
             return 0;

         moov_size = get_moov_size(s);

         for (i = 0; i < mov->nb_streams; i++)

             mov->tracks[i].data_offset = pos + moov_size + 8;

         mov_write_moov_tag(s->pb, mov, s);

 
         buf_size = avio_close_dyn_buf(mov->mdat_buf, &buf);
         mov->mdat_buf = NULL;
         avio_wb32(s->pb, buf_size + 8);
         ffio_wfourcc(s->pb, "mdat");
         avio_write(s->pb, buf, buf_size);
         av_free(buf);
 

         mov->fragments++;
         mov->mdat_size = 0;
         for (i = 0; i < mov->nb_streams; i++) {
             if (mov->tracks[i].entry)
                 mov->tracks[i].frag_start += mov->tracks[i].start_dts +

                                              mov->tracks[i].track_duration -

                                              mov->tracks[i].cluster[0].dts;
             mov->tracks[i].entry = 0;

         }

         avio_flush(s->pb);

         return 0;

     }

 
     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         if (mov->flags & FF_MOV_FLAG_SEPARATE_MOOF)
             track->data_offset = 0;
         else
             track->data_offset = mdat_size;
         if (!track->mdat_buf)
             continue;
         mdat_size += avio_tell(track->mdat_buf);
         if (first_track < 0)
             first_track = i;

     }

 
     if (!mdat_size)
         return 0;
 
     for (i = 0; i < mov->nb_streams; i++) {
         MOVTrack *track = &mov->tracks[i];
         int buf_size, write_moof = 1, moof_tracks = -1;
         uint8_t *buf;
         int64_t duration = 0;
 
         if (track->entry)

             duration = track->start_dts + track->track_duration -

                        track->cluster[0].dts;
         if (mov->flags & FF_MOV_FLAG_SEPARATE_MOOF) {
             if (!track->mdat_buf)
                 continue;
             mdat_size = avio_tell(track->mdat_buf);
             moof_tracks = i;
         } else {
             write_moof = i == first_track;
         }
 
         if (write_moof) {
             MOVFragmentInfo *info;

             avio_flush(s->pb);

             track->nb_frag_info++;
             track->frag_info = av_realloc(track->frag_info,
                                           sizeof(*track->frag_info) *
                                           track->nb_frag_info);
             info = &track->frag_info[track->nb_frag_info - 1];
             info->offset   = avio_tell(s->pb);
             info->time     = mov->tracks[i].frag_start;

             info->duration = duration;
             mov_write_tfrf_tags(s->pb, mov, track);

 
             mov_write_moof_tag(s->pb, mov, moof_tracks);

             info->tfrf_offset = track->tfrf_offset;

             mov->fragments++;
 
             avio_wb32(s->pb, mdat_size + 8);
             ffio_wfourcc(s->pb, "mdat");
         }
 
         if (track->entry)
             track->frag_start += duration;
         track->entry = 0;
         if (!track->mdat_buf)
             continue;
         buf_size = avio_close_dyn_buf(track->mdat_buf, &buf);
         track->mdat_buf = NULL;
 
         avio_write(s->pb, buf, buf_size);
         av_free(buf);
     }
 
     mov->mdat_size = 0;

     avio_flush(s->pb);

     return 0;
 }
 

 int ff_mov_write_packet(AVFormatContext *s, AVPacket *pkt)