/*

  * WAV demuxer

  * Copyright (c) 2001, 2002 Fabrice Bellard

  *

  * Sony Wave64 demuxer

  * RF64 demuxer

  * Copyright (c) 2009 Daniel Verkamp
  *

  * 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 <stdint.h>
 

 #include "libavutil/avassert.h"
 #include "libavutil/dict.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/log.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/opt.h"

 #include "avformat.h"

 #include "avio.h"

 #include "avio_internal.h"

 #include "internal.h"
 #include "metadata.h"

 #include "pcm.h"

 #include "riff.h"

 #include "w64.h"

 #include "spdif.h"

 typedef struct WAVDemuxContext {

     const AVClass *class;

     int64_t data_end;

     int w64;

     int64_t smv_data_ofs;
     int smv_block_size;
     int smv_frames_per_jpeg;
     int smv_block;
     int smv_last_stream;
     int smv_eof;
     int audio_eof;

     int ignore_length;

     int spdif;

     int smv_cur_pt;
     int smv_given_first;

     int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended

     int rifx; // RIFX: integer byte order for parameters is big endian

 } WAVDemuxContext;

 static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
 {

     if (CONFIG_SPDIF_DEMUXER && s->streams[0]->codecpar->codec_tag == 1) {

         enum AVCodecID codec;

         int len = 1<<16;

         int ret = ffio_ensure_seekback(s->pb, len);

         if (ret >= 0) {
             uint8_t *buf = av_malloc(len);
             if (!buf) {
                 ret = AVERROR(ENOMEM);
             } else {
                 int64_t pos = avio_tell(s->pb);
                 len = ret = avio_read(s->pb, buf, len);
                 if (len >= 0) {
                     ret = ff_spdif_probe(buf, len, &codec);
                     if (ret > AVPROBE_SCORE_EXTENSION) {
                         s->streams[0]->codecpar->codec_id = codec;
                         wav->spdif = 1;
                     }
                 }
                 avio_seek(s->pb, pos, SEEK_SET);
                 av_free(buf);
             }

         }
 
         if (ret < 0)
             av_log(s, AV_LOG_WARNING, "Cannot check for SPDIF\n");

     }
 }
 

 #if CONFIG_WAV_DEMUXER

 static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)

 {

     *tag = avio_rl32(pb);

     if (!big_endian) {
         return avio_rl32(pb);
     } else {
         return avio_rb32(pb);
     }

 }
 

 /* RIFF chunks are always at even offsets relative to where they start. */
 static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)

 {

     offset += offset < INT64_MAX && offset + wav->unaligned & 1;

 
     return avio_seek(s, offset, whence);

 }
 

 /* return the size of the found tag */

 static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)

 {
     unsigned int tag;

     int64_t size;

     for (;;) {

         if (avio_feof(pb))

             return AVERROR_EOF;

         size = next_tag(pb, &tag, wav->rifx);

         if (tag == tag1)
             break;

         wav_seek_tag(wav, pb, size, SEEK_CUR);

     }
     return size;
 }
 

 static int wav_probe(AVProbeData *p)
 {
     /* check file header */
     if (p->buf_size <= 32)
         return 0;

     if (!memcmp(p->buf + 8, "WAVE", 4)) {

         if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))

             /* Since the ACT demuxer has a standard WAV header at the top of
              * its own, the returned score is decreased to avoid a probe
              * conflict between ACT and WAV. */

             return AVPROBE_SCORE_MAX - 1;

         else if (!memcmp(p->buf,      "RF64", 4) &&
                  !memcmp(p->buf + 12, "ds64", 4))
             return AVPROBE_SCORE_MAX;
     }

     return 0;

 }
 

 static void handle_stream_probing(AVStream *st)
 {

     if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {

         st->request_probe = AVPROBE_SCORE_EXTENSION;

         st->probe_packets = FFMIN(st->probe_packets, 32);

     }
 }
 

 static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
 {
     AVIOContext *pb = s->pb;

     WAVDemuxContext *wav = s->priv_data;

     int ret;
 
     /* parse fmt header */

     *st = avformat_new_stream(s, NULL);

     if (!*st)
         return AVERROR(ENOMEM);
 

     ret = ff_get_wav_header(s, pb, (*st)->codecpar, size, wav->rifx);

     if (ret < 0)
         return ret;

     handle_stream_probing(*st);
 

     (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;

     avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);

 
     return 0;
 }
 

 static int wav_parse_xma2_tag(AVFormatContext *s, int64_t size, AVStream **st)
 {
     AVIOContext *pb = s->pb;

     int version, num_streams, i, channels = 0;

     if (size < 36)

         return AVERROR_INVALIDDATA;
 
     *st = avformat_new_stream(s, NULL);
     if (!*st)
         return AVERROR(ENOMEM);
 

     (*st)->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     (*st)->codecpar->codec_id   = AV_CODEC_ID_XMA2;
     (*st)->need_parsing         = AVSTREAM_PARSE_FULL_RAW;

     version = avio_r8(pb);
     if (version != 3 && version != 4)
         return AVERROR_INVALIDDATA;

     num_streams = avio_r8(pb);

     if (size != (32 + ((version==3)?0:8) + 4*num_streams))

         return AVERROR_INVALIDDATA;
     avio_skip(pb, 10);

     (*st)->codecpar->sample_rate = avio_rb32(pb);

     if (version == 4)
         avio_skip(pb, 8);
     avio_skip(pb, 4);

     (*st)->duration = avio_rb32(pb);
     avio_skip(pb, 8);
 
     for (i = 0; i < num_streams; i++) {
         channels += avio_r8(pb);
         avio_skip(pb, 3);
     }

     (*st)->codecpar->channels = channels;

     if ((*st)->codecpar->channels <= 0 || (*st)->codecpar->sample_rate <= 0)

         return AVERROR_INVALIDDATA;
 

     avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);

 
     avio_seek(pb, -size, SEEK_CUR);
     av_freep(&(*st)->codecpar->extradata);
     if (ff_get_extradata(s, (*st)->codecpar, pb, size) < 0)

         return AVERROR(ENOMEM);
 
     return 0;
 }
 

 static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
                                         int length)

 {
     char temp[257];
     int ret;
 

     av_assert0(length <= sizeof(temp));

     if ((ret = avio_read(s->pb, temp, length)) < 0)
         return ret;
 
     temp[length] = 0;
 
     if (strlen(temp))

         return av_dict_set(&s->metadata, key, temp, 0);

 
     return 0;
 }
 
 static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
 {
     char temp[131], *coding_history;
     int ret, x;
     uint64_t time_reference;
     int64_t umid_parts[8], umid_mask = 0;
 
     if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
         (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
         (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
         (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
         (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
         return ret;
 
     time_reference = avio_rl64(s->pb);

     snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);

     if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)

         return ret;
 
     /* check if version is >= 1, in which case an UMID may be present */
     if (avio_rl16(s->pb) >= 1) {
         for (x = 0; x < 8; x++)
             umid_mask |= umid_parts[x] = avio_rb64(s->pb);
 
         if (umid_mask) {
             /* the string formatting below is per SMPTE 330M-2004 Annex C */

             if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
                 umid_parts[6] == 0 && umid_parts[7] == 0) {

                 /* basic UMID */

                 snprintf(temp, sizeof(temp),
                          "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
                          umid_parts[0], umid_parts[1],
                          umid_parts[2], umid_parts[3]);

             } else {
                 /* extended UMID */

                 snprintf(temp, sizeof(temp),
                          "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64

                          "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,

                          umid_parts[0], umid_parts[1],
                          umid_parts[2], umid_parts[3],
                          umid_parts[4], umid_parts[5],
                          umid_parts[6], umid_parts[7]);

             }
 

             if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)

                 return ret;
         }
 
         avio_skip(s->pb, 190);
     } else
         avio_skip(s->pb, 254);
 
     if (size > 602) {
         /* CodingHistory present */
         size -= 602;
 

         if (!(coding_history = av_malloc(size + 1)))

             return AVERROR(ENOMEM);
 
         if ((ret = avio_read(s->pb, coding_history, size)) < 0)
             return ret;
 
         coding_history[size] = 0;

         if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,

                                AV_DICT_DONT_STRDUP_VAL)) < 0)

             return ret;
     }
 
     return 0;
 }
 

 static const AVMetadataConv wav_metadata_conv[] = {

     { "description",      "comment"       },
     { "originator",       "encoded_by"    },
     { "origination_date", "date"          },
     { "origination_time", "creation_time" },
     { 0 },

 };
 

 /* wav input */

 static int wav_read_header(AVFormatContext *s)

 {

     int64_t size, av_uninit(data_size);

     int64_t sample_count = 0;

     int rf64 = 0;

     uint32_t tag;

     AVIOContext *pb      = s->pb;
     AVStream *st         = NULL;

     WAVDemuxContext *wav = s->priv_data;

     int ret, got_fmt = 0, got_xma2 = 0;

     int64_t next_tag_ofs, data_ofs = -1;

     wav->unaligned = avio_tell(s->pb) & 1;
 

     wav->smv_data_ofs = -1;
 

     /* read chunk ID */

     tag = avio_rl32(pb);

     switch (tag) {
     case MKTAG('R', 'I', 'F', 'F'):
         break;
     case MKTAG('R', 'I', 'F', 'X'):
         wav->rifx = 1;
         break;
     case MKTAG('R', 'F', '6', '4'):
         rf64 = 1;
         break;
     default:

         av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
                av_fourcc2str(tag));

         return AVERROR_INVALIDDATA;

     }
 
     /* read chunk size */
     avio_rl32(pb);
 
     /* read format */
     if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
         av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");

         return AVERROR_INVALIDDATA;

     }

     if (rf64) {

         if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))

             return AVERROR_INVALIDDATA;

         size = avio_rl32(pb);

         if (size < 24)

             return AVERROR_INVALIDDATA;

         avio_rl64(pb); /* RIFF size */

 
         data_size    = avio_rl64(pb);

         sample_count = avio_rl64(pb);

         if (data_size < 0 || sample_count < 0) {
             av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "

                    "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",

                    data_size, sample_count);
             return AVERROR_INVALIDDATA;
         }

         avio_skip(pb, size - 24); /* skip rest of ds64 chunk */

     }
 

     for (;;) {

         AVStream *vst;

         size         = next_tag(pb, &tag, wav->rifx);

         next_tag_ofs = avio_tell(pb) + size;

         if (avio_feof(pb))

             break;
 

         switch (tag) {
         case MKTAG('f', 'm', 't', ' '):

             /* only parse the first 'fmt ' tag found */

             if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {

                 return ret;
             } else if (got_fmt)
                 av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
 
             got_fmt = 1;

             break;

         case MKTAG('X', 'M', 'A', '2'):
             /* only parse the first 'XMA2' tag found */
             if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
                 return ret;
             } else if (got_xma2)
                 av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
 
             got_xma2 = 1;
             break;

         case MKTAG('d', 'a', 't', 'a'):

             if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {

                 av_log(s, AV_LOG_ERROR,
                        "found no 'fmt ' tag before the 'data' tag\n");

                 return AVERROR_INVALIDDATA;
             }
 

             if (rf64) {
                 next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;

             } else if (size != 0xFFFFFFFF) {

                 data_size    = size;

                 next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;

             } else {
                 av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
                        "file may be invalid\n");
                 data_size    = 0;
                 next_tag_ofs = wav->data_end = INT64_MAX;

             }
 

             data_ofs = avio_tell(pb);
 

             /* don't look for footer metadata if we can't seek or if we don't
              * know where the data tag ends
              */

             if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!rf64 && !size))

                 goto break_loop;

             break;

         case MKTAG('f', 'a', 'c', 't'):

             if (!sample_count)

                 sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));

             break;

         case MKTAG('b', 'e', 'x', 't'):

             if ((ret = wav_parse_bext_tag(s, size)) < 0)
                 return ret;
             break;

         case MKTAG('S','M','V','0'):

             if (!got_fmt) {
                 av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
                 return AVERROR_INVALIDDATA;
             }

             // SMV file, a wav file with video appended.
             if (size != MKTAG('0','2','0','0')) {
                 av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
                 goto break_loop;
             }
             av_log(s, AV_LOG_DEBUG, "Found SMV data\n");

             wav->smv_given_first = 0;

             vst = avformat_new_stream(s, NULL);

             if (!vst)
                 return AVERROR(ENOMEM);
             avio_r8(pb);

             vst->id = 1;

             vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
             vst->codecpar->codec_id = AV_CODEC_ID_SMVJPEG;
             vst->codecpar->width  = avio_rl24(pb);
             vst->codecpar->height = avio_rl24(pb);
             if (ff_alloc_extradata(vst->codecpar, 4)) {

                 av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
                 return AVERROR(ENOMEM);
             }

             size = avio_rl24(pb);
             wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
             avio_rl24(pb);
             wav->smv_block_size = avio_rl24(pb);

             avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));

             vst->duration = avio_rl24(pb);
             avio_rl24(pb);
             avio_rl24(pb);
             wav->smv_frames_per_jpeg = avio_rl24(pb);

             if (wav->smv_frames_per_jpeg > 65536) {
                 av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
                 return AVERROR_INVALIDDATA;
             }

             AV_WL32(vst->codecpar->extradata, wav->smv_frames_per_jpeg);

             wav->smv_cur_pt = 0;

             goto break_loop;

         case MKTAG('L', 'I', 'S', 'T'):

             if (size < 4) {

                 av_log(s, AV_LOG_ERROR, "too short LIST tag\n");

                 return AVERROR_INVALIDDATA;
             }

             switch (avio_rl32(pb)) {

             case MKTAG('I', 'N', 'F', 'O'):

                 ff_read_riff_info(s, size - 4);

             }
             break;

         }

 
         /* seek to next tag unless we know that we'll run into EOF */
         if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||

             wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {

             break;
         }

     }

 break_loop:

     if (!got_fmt && !got_xma2) {
         av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (data_ofs < 0) {
         av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
         return AVERROR_INVALIDDATA;
     }
 
     avio_seek(pb, data_ofs, SEEK_SET);

     if (data_size > (INT64_MAX>>3)) {
         av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
         data_size = 0;
     }
 

     if (   st->codecpar->bit_rate > 0 && data_size > 0
         && st->codecpar->sample_rate > 0
         && sample_count > 0 && st->codecpar->channels > 1
         && sample_count % st->codecpar->channels == 0) {
         if (fabs(8.0 * data_size * st->codecpar->channels * st->codecpar->sample_rate /
             sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
             sample_count /= st->codecpar->channels;

     }
 

     if (   data_size > 0 && sample_count && st->codecpar->channels
         && (data_size << 3) / sample_count / st->codecpar->channels > st->codecpar->bits_per_coded_sample  + 1) {

         av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
         sample_count = 0;
     }
 

     /* G.729 hack (for Ticket4577)
      * FIXME: Come up with cleaner, more general solution */

     if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {

         av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
         sample_count = 0;
     }
 

     if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
         if (   st->codecpar->channels

             && data_size

             && av_get_bits_per_sample(st->codecpar->codec_id)

             && wav->data_end <= avio_size(pb))
             sample_count = (data_size << 3)
                                   /

                 (st->codecpar->channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));

     if (sample_count)
         st->duration = sample_count;

     if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S32LE &&
         st->codecpar->block_align == st->codecpar->channels * 4 &&
         st->codecpar->bits_per_coded_sample == 32 &&
         st->codecpar->extradata_size == 2 &&
         AV_RL16(st->codecpar->extradata) == 1) {
         st->codecpar->codec_id = AV_CODEC_ID_PCM_F16LE;
         st->codecpar->bits_per_coded_sample = 16;
     } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
                st->codecpar->block_align == st->codecpar->channels * 4 &&
                st->codecpar->bits_per_coded_sample == 24) {
         st->codecpar->codec_id = AV_CODEC_ID_PCM_F24LE;

     } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
                st->codecpar->codec_id == AV_CODEC_ID_XMA2) {
         st->codecpar->block_align = 2048;

     }
 

     ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);

     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);

     set_spdif(s, wav);
 

     return 0;
 }
 

 /**
  * Find chunk with w64 GUID by skipping over other chunks.

  * @return the size of the found chunk
  */

 static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])

 {
     uint8_t guid[16];
     int64_t size;
 

     while (!avio_feof(pb)) {

         avio_read(pb, guid, 16);
         size = avio_rl64(pb);

         if (size <= 24)

             return AVERROR_INVALIDDATA;

         if (!memcmp(guid, guid1, 16))
             return size;

         avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);

     }

     return AVERROR_EOF;

 }
 

 #define MAX_SIZE 4096
 

 static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)

 {

     int ret, size;
     int64_t left;

     AVStream *st;

     WAVDemuxContext *wav = s->priv_data;

     if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
         return ff_spdif_read_packet(s, pkt);
 

     if (wav->smv_data_ofs > 0) {
         int64_t audio_dts, video_dts;
 smv_retry:

         audio_dts = (int32_t)s->streams[0]->cur_dts;
         video_dts = (int32_t)s->streams[1]->cur_dts;

         if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {

             /*We always return a video frame first to get the pixel format first*/

             wav->smv_last_stream = wav->smv_given_first ?
                 av_compare_ts(video_dts, s->streams[1]->time_base,
                               audio_dts, s->streams[0]->time_base) > 0 : 0;

             wav->smv_given_first = 1;

         }
         wav->smv_last_stream = !wav->smv_last_stream;
         wav->smv_last_stream |= wav->audio_eof;
         wav->smv_last_stream &= !wav->smv_eof;
         if (wav->smv_last_stream) {
             uint64_t old_pos = avio_tell(s->pb);
             uint64_t new_pos = wav->smv_data_ofs +
                 wav->smv_block * wav->smv_block_size;
             if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
                 ret = AVERROR_EOF;
                 goto smv_out;
             }
             size = avio_rl24(s->pb);
             ret  = av_get_packet(s->pb, pkt, size);
             if (ret < 0)
                 goto smv_out;
             pkt->pos -= 3;

             pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
             wav->smv_cur_pt++;
             if (wav->smv_frames_per_jpeg > 0)
                 wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
             if (!wav->smv_cur_pt)
                 wav->smv_block++;
 

             pkt->stream_index = 1;
 smv_out:
             avio_seek(s->pb, old_pos, SEEK_SET);
             if (ret == AVERROR_EOF) {
                 wav->smv_eof = 1;
                 goto smv_retry;
             }
             return ret;
         }
     }
 

     st = s->streams[0];
 

     left = wav->data_end - avio_tell(s->pb);

     if (wav->ignore_length)

         left = INT_MAX;

     if (left <= 0) {

         if (CONFIG_W64_DEMUXER && wav->w64)

             left = find_guid(s->pb, ff_w64_guid_data) - 24;

         else

             left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));

         if (left < 0) {
             wav->audio_eof = 1;
             if (wav->smv_data_ofs > 0 && !wav->smv_eof)
                 goto smv_retry;

             return AVERROR_EOF;

         }

         wav->data_end = avio_tell(s->pb) + left;

     }
 

     size = MAX_SIZE;

     if (st->codecpar->block_align > 1) {
         if (size < st->codecpar->block_align)
             size = st->codecpar->block_align;
         size = (size / st->codecpar->block_align) * st->codecpar->block_align;

     }

     size = FFMIN(size, left);
     ret  = av_get_packet(s->pb, pkt, size);

     if (ret < 0)
         return ret;

     pkt->stream_index = 0;
 
     return ret;
 }
 

 static int wav_read_seek(AVFormatContext *s,

                          int stream_index, int64_t timestamp, int flags)

 {

     WAVDemuxContext *wav = s->priv_data;

     AVStream *st;

     wav->smv_eof = 0;
     wav->audio_eof = 0;
     if (wav->smv_data_ofs > 0) {
         int64_t smv_timestamp = timestamp;
         if (stream_index == 0)
             smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
         else
             timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);

         if (wav->smv_frames_per_jpeg > 0) {
             wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
             wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
         }

     }

 
     st = s->streams[0];

     switch (st->codecpar->codec_id) {

     case AV_CODEC_ID_MP2:
     case AV_CODEC_ID_MP3:
     case AV_CODEC_ID_AC3:
     case AV_CODEC_ID_DTS:

     case AV_CODEC_ID_XMA2:

         /* use generic seeking with dynamically generated indexes */
         return -1;
     default:
         break;
     }

     return ff_pcm_read_seek(s, stream_index, timestamp, flags);

 }
 

 #define OFFSET(x) offsetof(WAVDemuxContext, x)

 #define DEC AV_OPT_FLAG_DECODING_PARAM
 static const AVOption demux_options[] = {

     { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },

     { NULL },
 };
 
 static const AVClass wav_demuxer_class = {
     .class_name = "WAV demuxer",
     .item_name  = av_default_item_name,
     .option     = demux_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };

 AVInputFormat ff_wav_demuxer = {

     .name           = "wav",

     .long_name      = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),

     .priv_data_size = sizeof(WAVDemuxContext),

     .read_probe     = wav_probe,
     .read_header    = wav_read_header,
     .read_packet    = wav_read_packet,
     .read_seek      = wav_read_seek,

     .flags          = AVFMT_GENERIC_INDEX,

     .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags,  0 },

     .priv_class     = &wav_demuxer_class,

 };

 #endif /* CONFIG_WAV_DEMUXER */

 #if CONFIG_W64_DEMUXER

 static int w64_probe(AVProbeData *p)
 {
     if (p->buf_size <= 40)
         return 0;

     if (!memcmp(p->buf,      ff_w64_guid_riff, 16) &&
         !memcmp(p->buf + 24, ff_w64_guid_wave, 16))

         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }
 

 static int w64_read_header(AVFormatContext *s)

 {

     int64_t size, data_ofs = 0;

     AVIOContext *pb      = s->pb;
     WAVDemuxContext *wav = s->priv_data;

     AVStream *st;
     uint8_t guid[16];

     int ret;

     avio_read(pb, guid, 16);

     if (memcmp(guid, ff_w64_guid_riff, 16))

         return AVERROR_INVALIDDATA;

     /* riff + wave + fmt + sizes */
     if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)

         return AVERROR_INVALIDDATA;

     avio_read(pb, guid, 16);

     if (memcmp(guid, ff_w64_guid_wave, 16)) {

         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");

         return AVERROR_INVALIDDATA;

     }
 

     wav->w64 = 1;

     st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);
 

     while (!avio_feof(pb)) {

         if (avio_read(pb, guid, 16) != 16)
             break;
         size = avio_rl64(pb);
         if (size <= 24 || INT64_MAX - size < avio_tell(pb))
             return AVERROR_INVALIDDATA;

         if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
             /* subtract chunk header size - normal wav file doesn't count it */

             ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);

             if (ret < 0)
                 return ret;
             avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);

             avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

         } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
             int64_t samples;
 
             samples = avio_rl64(pb);
             if (samples > 0)
                 st->duration = samples;

         } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
             wav->data_end = avio_tell(pb) + size - 24;

             data_ofs = avio_tell(pb);

             if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))

                 break;
 
             avio_skip(pb, size - 24);
         } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
             int64_t start, end, cur;
             uint32_t count, chunk_size, i;
 
             start = avio_tell(pb);

             end = start + FFALIGN(size, INT64_C(8)) - 24;

             count = avio_rl32(pb);
 
             for (i = 0; i < count; i++) {
                 char chunk_key[5], *value;
 

                 if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)

                     break;
 
                 chunk_key[4] = 0;
                 avio_read(pb, chunk_key, 4);
                 chunk_size = avio_rl32(pb);

                 if (chunk_size == UINT32_MAX)
                     return AVERROR_INVALIDDATA;

 
                 value = av_mallocz(chunk_size + 1);
                 if (!value)
                     return AVERROR(ENOMEM);
 
                 ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
                 avio_skip(pb, chunk_size - ret);
 
                 av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
             }
 
             avio_skip(pb, end - avio_tell(pb));
         } else {
             av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));

             avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);

         }

     }

 
     if (!data_ofs)
         return AVERROR_EOF;
 
     ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
 
     handle_stream_probing(st);
     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
 
     avio_seek(pb, data_ofs, SEEK_SET);

     set_spdif(s, wav);
 

     return 0;
 }
 

 AVInputFormat ff_w64_demuxer = {

     .name           = "w64",

     .long_name      = NULL_IF_CONFIG_SMALL("Sony Wave64"),

     .priv_data_size = sizeof(WAVDemuxContext),

     .read_probe     = w64_probe,
     .read_header    = w64_read_header,
     .read_packet    = wav_read_packet,
     .read_seek      = wav_read_seek,

     .flags          = AVFMT_GENERIC_INDEX,

     .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },

 };

 #endif /* CONFIG_W64_DEMUXER */