/*
  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>

  * Copyright (c) 2010 Peter Ross <pross@xvid.org>

  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.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
  */
 
 /**

  * @file

  * IFF file demuxer

  * by Jaikrishnan Menon
  * for more information on the .iff file format, visit:
  * http://wiki.multimedia.cx/index.php?title=IFF
  */
 

 #include <inttypes.h>
 

 #include "libavutil/avassert.h"

 #include "libavutil/channel_layout.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/dict.h"

 #include "libavcodec/bytestream.h"

 #include "avformat.h"

 #include "id3v2.h"

 #include "internal.h"

 
 #define ID_8SVX       MKTAG('8','S','V','X')

 #define ID_16SV       MKTAG('1','6','S','V')

 #define ID_MAUD       MKTAG('M','A','U','D')
 #define ID_MHDR       MKTAG('M','H','D','R')
 #define ID_MDAT       MKTAG('M','D','A','T')

 #define ID_VHDR       MKTAG('V','H','D','R')
 #define ID_ATAK       MKTAG('A','T','A','K')
 #define ID_RLSE       MKTAG('R','L','S','E')
 #define ID_CHAN       MKTAG('C','H','A','N')

 #define ID_PBM        MKTAG('P','B','M',' ')
 #define ID_ILBM       MKTAG('I','L','B','M')
 #define ID_BMHD       MKTAG('B','M','H','D')

 #define ID_DGBL       MKTAG('D','G','B','L')

 #define ID_CAMG       MKTAG('C','A','M','G')

 #define ID_CMAP       MKTAG('C','M','A','P')

 #define ID_ACBM       MKTAG('A','C','B','M')

 #define ID_DEEP       MKTAG('D','E','E','P')

 #define ID_RGB8       MKTAG('R','G','B','8')
 #define ID_RGBN       MKTAG('R','G','B','N')

 #define ID_DSD        MKTAG('D','S','D',' ')

 #define ID_DST        MKTAG('D','S','T',' ')
 #define ID_DSTC       MKTAG('D','S','T','C')
 #define ID_DSTF       MKTAG('D','S','T','F')
 #define ID_FRTE       MKTAG('F','R','T','E')

 #define ID_ANIM       MKTAG('A','N','I','M')

 #define ID_ANHD       MKTAG('A','N','H','D')
 #define ID_DLTA       MKTAG('D','L','T','A')

 #define ID_DPAN       MKTAG('D','P','A','N')

 
 #define ID_FORM       MKTAG('F','O','R','M')

 #define ID_FRM8       MKTAG('F','R','M','8')

 #define ID_ANNO       MKTAG('A','N','N','O')
 #define ID_AUTH       MKTAG('A','U','T','H')
 #define ID_CHRS       MKTAG('C','H','R','S')
 #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
 #define ID_CSET       MKTAG('C','S','E','T')
 #define ID_FVER       MKTAG('F','V','E','R')
 #define ID_NAME       MKTAG('N','A','M','E')
 #define ID_TEXT       MKTAG('T','E','X','T')

 #define ID_ABIT       MKTAG('A','B','I','T')

 #define ID_BODY       MKTAG('B','O','D','Y')

 #define ID_DBOD       MKTAG('D','B','O','D')
 #define ID_DPEL       MKTAG('D','P','E','L')

 #define ID_DLOC       MKTAG('D','L','O','C')

 #define ID_TVDC       MKTAG('T','V','D','C')

 
 #define LEFT    2
 #define RIGHT   4
 #define STEREO  6
 

 /**
  * This number of bytes if added at the beginning of each AVPacket
  * which contain additional information about video properties
  * which has to be shared between demuxer and decoder.
  * This number may change between frames, e.g. the demuxer might
  * set it to smallest possible size of 2 to indicate that there's
  * no extradata changing in this frame.
  */

 #define IFF_EXTRA_VIDEO_SIZE 41

 typedef enum {
     COMP_NONE,
     COMP_FIB,
     COMP_EXP
 } svx8_compression_type;
 

 typedef struct IffDemuxContext {

     int      is_64bit;  ///< chunk size is 64-bit

     int64_t  body_pos;
     int64_t  body_end;

     uint32_t  body_size;

     svx8_compression_type   svx8_compression;

     unsigned  maud_bits;
     unsigned  maud_compression;

     unsigned  bitmap_compression;  ///< delta compression method used

     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
     unsigned  transparency; ///< transparency color index in palette
     unsigned  masking;      ///< masking method used

     uint8_t   tvdc[32];     ///< TVDC lookup table

     int64_t   pts;

 } IffDemuxContext;
 

 /* Metadata string read */
 static int get_metadata(AVFormatContext *s,
                         const char *const tag,
                         const unsigned data_size)
 {
     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
 
     if (!buf)
         return AVERROR(ENOMEM);
 

     if (avio_read(s->pb, buf, data_size) != data_size) {

         av_free(buf);
         return AVERROR(EIO);
     }
     buf[data_size] = 0;

     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);

     return 0;
 }
 

 static int iff_probe(AVProbeData *p)
 {
     const uint8_t *d = p->buf;
 

     if ( (AV_RL32(d)   == ID_FORM &&

          (AV_RL32(d+8) == ID_8SVX ||

           AV_RL32(d+8) == ID_16SV ||

           AV_RL32(d+8) == ID_MAUD ||

           AV_RL32(d+8) == ID_PBM  ||
           AV_RL32(d+8) == ID_ACBM ||
           AV_RL32(d+8) == ID_DEEP ||

           AV_RL32(d+8) == ID_ILBM ||
           AV_RL32(d+8) == ID_RGB8 ||

           AV_RL32(d+8) == ID_ANIM ||

           AV_RL32(d+8) == ID_RGBN)) ||
          (AV_RL32(d) == ID_FRM8 && AV_RL32(d+12) == ID_DSD))

         return AVPROBE_SCORE_MAX;
     return 0;
 }
 

 static const AVCodecTag dsd_codec_tags[] = {
     { AV_CODEC_ID_DSD_MSBF, ID_DSD },

     { AV_CODEC_ID_DST,      ID_DST },

     { AV_CODEC_ID_NONE, 0 },
 };
 
 
 #define DSD_SLFT MKTAG('S','L','F','T')
 #define DSD_SRGT MKTAG('S','R','G','T')
 #define DSD_MLFT MKTAG('M','L','F','T')
 #define DSD_MRGT MKTAG('M','R','G','T')
 #define DSD_C    MKTAG('C',' ',' ',' ')
 #define DSD_LS   MKTAG('L','S',' ',' ')
 #define DSD_RS   MKTAG('R','S',' ',' ')
 #define DSD_LFE  MKTAG('L','F','E',' ')
 
 static const uint32_t dsd_stereo[]  = { DSD_SLFT, DSD_SRGT };
 static const uint32_t dsd_5point0[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LS, DSD_RS };
 static const uint32_t dsd_5point1[] = { DSD_MLFT, DSD_MRGT, DSD_C, DSD_LFE, DSD_LS, DSD_RS };
 
 typedef struct {
     uint64_t layout;
     const uint32_t * dsd_layout;
 } DSDLayoutDesc;
 
 static const DSDLayoutDesc dsd_channel_layout[] = {
     { AV_CH_LAYOUT_STEREO,  dsd_stereo },
     { AV_CH_LAYOUT_5POINT0, dsd_5point0 },
     { AV_CH_LAYOUT_5POINT1, dsd_5point1 },
 };
 
 static const uint64_t dsd_loudspeaker_config[] = {
     AV_CH_LAYOUT_STEREO,
     0, 0,
     AV_CH_LAYOUT_5POINT0, AV_CH_LAYOUT_5POINT1,
 };
 
 static const char * dsd_source_comment[] = {
     "dsd_source_comment",
     "analogue_source_comment",
     "pcm_source_comment",
 };
 
 static const char * dsd_history_comment[] = {
     "general_remark",
     "operator_name",
     "creating_machine",
     "timezone",
     "file_revision"
 };
 
 static int parse_dsd_diin(AVFormatContext *s, AVStream *st, uint64_t eof)
 {
     AVIOContext *pb = s->pb;
 

     while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {

         uint32_t tag      = avio_rl32(pb);
         uint64_t size     = avio_rb64(pb);
         uint64_t orig_pos = avio_tell(pb);
         const char * metadata_tag = NULL;
 
         switch(tag) {
         case MKTAG('D','I','A','R'): metadata_tag = "artist"; break;
         case MKTAG('D','I','T','I'): metadata_tag = "title";  break;
         }
 
         if (metadata_tag && size > 4) {
             unsigned int tag_size = avio_rb32(pb);
             int ret = get_metadata(s, metadata_tag, FFMIN(tag_size, size - 4));
             if (ret < 0) {
                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
                 return ret;
             }
         }
 
         avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
     }
 
     return 0;
 }
 
 static int parse_dsd_prop(AVFormatContext *s, AVStream *st, uint64_t eof)
 {
     AVIOContext *pb = s->pb;
     char abss[24];
     int hour, min, sec, i, ret, config;
     int dsd_layout[6];
     ID3v2ExtraMeta *id3v2_extra_meta;
 

     while (avio_tell(pb) + 12 <= eof && !avio_feof(pb)) {

         uint32_t tag      = avio_rl32(pb);
         uint64_t size     = avio_rb64(pb);
         uint64_t orig_pos = avio_tell(pb);
 
         switch(tag) {
         case MKTAG('A','B','S','S'):
             if (size < 8)
                 return AVERROR_INVALIDDATA;
             hour = avio_rb16(pb);
             min  = avio_r8(pb);
             sec  = avio_r8(pb);
             snprintf(abss, sizeof(abss), "%02dh:%02dm:%02ds:%d", hour, min, sec, avio_rb32(pb));
             av_dict_set(&st->metadata, "absolute_start_time", abss, 0);
             break;
 
         case MKTAG('C','H','N','L'):
             if (size < 2)
                 return AVERROR_INVALIDDATA;

             st->codecpar->channels       = avio_rb16(pb);
             if (size < 2 + st->codecpar->channels * 4)

                 return AVERROR_INVALIDDATA;

             st->codecpar->channel_layout = 0;
             if (st->codecpar->channels > FF_ARRAY_ELEMS(dsd_layout)) {

                 avpriv_request_sample(s, "channel layout");
                 break;
             }

             for (i = 0; i < st->codecpar->channels; i++)

                 dsd_layout[i] = avio_rl32(pb);
             for (i = 0; i < FF_ARRAY_ELEMS(dsd_channel_layout); i++) {
                 const DSDLayoutDesc * d = &dsd_channel_layout[i];

                 if (av_get_channel_layout_nb_channels(d->layout) == st->codecpar->channels &&
                     !memcmp(d->dsd_layout, dsd_layout, st->codecpar->channels * sizeof(uint32_t))) {
                     st->codecpar->channel_layout = d->layout;

                     break;
                 }
             }
             break;
 
         case MKTAG('C','M','P','R'):
             if (size < 4)
                 return AVERROR_INVALIDDATA;

             st->codecpar->codec_tag = tag = avio_rl32(pb);

             st->codecpar->codec_id = ff_codec_get_id(dsd_codec_tags, tag);
             if (!st->codecpar->codec_id) {

                 av_log(s, AV_LOG_ERROR, "'%s' compression is not supported\n",
                        av_fourcc2str(tag));

                 return AVERROR_PATCHWELCOME;
             }

             break;
 
         case MKTAG('F','S',' ',' '):
             if (size < 4)
                 return AVERROR_INVALIDDATA;

             st->codecpar->sample_rate = avio_rb32(pb) / 8;

             break;
 
         case MKTAG('I','D','3',' '):
             id3v2_extra_meta = NULL;
             ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
             if (id3v2_extra_meta) {

                 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0 ||
                     (ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0) {

                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
                     return ret;
                 }
                 ff_id3v2_free_extra_meta(&id3v2_extra_meta);
             }
 
             if (size < avio_tell(pb) - orig_pos) {
                 av_log(s, AV_LOG_ERROR, "id3 exceeds chunk size\n");
                 return AVERROR_INVALIDDATA;
             }
             break;
 
         case MKTAG('L','S','C','O'):
             if (size < 2)
                 return AVERROR_INVALIDDATA;
             config = avio_rb16(pb);
             if (config != 0xFFFF) {
                 if (config < FF_ARRAY_ELEMS(dsd_loudspeaker_config))

                     st->codecpar->channel_layout = dsd_loudspeaker_config[config];
                 if (!st->codecpar->channel_layout)

                     avpriv_request_sample(s, "loudspeaker configuration %d", config);
             }
             break;
         }
 
         avio_skip(pb, size - (avio_tell(pb) - orig_pos) + (size & 1));
     }
 
     return 0;
 }
 

 static int read_dst_frame(AVFormatContext *s, AVPacket *pkt)
 {
     IffDemuxContext *iff = s->priv_data;
     AVIOContext *pb = s->pb;
     uint32_t chunk_id;
     uint64_t chunk_pos, data_pos, data_size;
     int ret = AVERROR_EOF;
 
     while (!avio_feof(pb)) {
         chunk_pos = avio_tell(pb);
         if (chunk_pos >= iff->body_end)
             return AVERROR_EOF;
 
         chunk_id = avio_rl32(pb);
         data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);
         data_pos = avio_tell(pb);
 
         if (data_size < 1)
             return AVERROR_INVALIDDATA;
 
         switch (chunk_id) {
         case ID_DSTF:
             if (!pkt) {
                 iff->body_pos  = avio_tell(pb) - (iff->is_64bit ? 12 : 8);
                 iff->body_size = iff->body_end - iff->body_pos;
                 return 0;
             }
             ret = av_get_packet(pb, pkt, data_size);
             if (ret < 0)
                 return ret;
             if (data_size & 1)
                 avio_skip(pb, 1);
             pkt->flags |= AV_PKT_FLAG_KEY;
             pkt->stream_index = 0;
             pkt->duration = 588 * s->streams[0]->codecpar->sample_rate / 44100;
             pkt->pos = chunk_pos;
 
             chunk_pos = avio_tell(pb);
             if (chunk_pos >= iff->body_end)
                 return 0;
 
             avio_seek(pb, chunk_pos, SEEK_SET);
             return 0;
 
         case ID_FRTE:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             s->streams[0]->duration = avio_rb32(pb) * 588LL * s->streams[0]->codecpar->sample_rate / 44100;
             break;
         }
 
         avio_skip(pb, data_size - (avio_tell(pb) - data_pos) + (data_size & 1));
     }
 
     return ret;
 }
 

 static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
 static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};

 static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
 static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
 static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};

 static int iff_read_header(AVFormatContext *s)

 {
     IffDemuxContext *iff = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st;

     uint8_t *buf;

     uint32_t chunk_id;
     uint64_t data_size;

     uint32_t screenmode = 0, num, den;

     unsigned transparency = 0;
     unsigned masking = 0; // no mask

     uint8_t fmt[16];
     int fmt_size;

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     st->codecpar->channels = 1;
     st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

     iff->is_64bit = avio_rl32(pb) == ID_FRM8;
     avio_skip(pb, iff->is_64bit ? 8 : 4);

     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content

     st->codecpar->codec_tag = avio_rl32(pb);

     if (st->codecpar->codec_tag == ID_ANIM) {

         avio_skip(pb, 12);

     }

     iff->bitmap_compression = -1;
     iff->svx8_compression = -1;
     iff->maud_bits = -1;
     iff->maud_compression = -1;

     while(!avio_feof(pb)) {

         uint64_t orig_pos;

         int res;
         const char *metadata_tag = NULL;

         int version, nb_comments, i;

         chunk_id = avio_rl32(pb);

         data_size = iff->is_64bit ? avio_rb64(pb) : avio_rb32(pb);

         orig_pos = avio_tell(pb);

 
         switch(chunk_id) {
         case ID_VHDR:

             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

 
             if (data_size < 14)
                 return AVERROR_INVALIDDATA;

             avio_skip(pb, 12);

             st->codecpar->sample_rate = avio_rb16(pb);

             if (data_size >= 16) {

                 avio_skip(pb, 1);

                 iff->svx8_compression = avio_r8(pb);

             }

             break;
 

         case ID_MHDR:

             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

 
             if (data_size < 32)
                 return AVERROR_INVALIDDATA;
             avio_skip(pb, 4);
             iff->maud_bits = avio_rb16(pb);
             avio_skip(pb, 2);
             num = avio_rb32(pb);
             den = avio_rb16(pb);
             if (!den)
                 return AVERROR_INVALIDDATA;
             avio_skip(pb, 2);

             st->codecpar->sample_rate = num / den;
             st->codecpar->channels = avio_rb16(pb);

             iff->maud_compression = avio_rb16(pb);

             if (st->codecpar->channels == 1)
                 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
             else if (st->codecpar->channels == 2)
                 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;

             break;
 

         case ID_ABIT:

         case ID_BODY:

         case ID_DBOD:

         case ID_DSD:

         case ID_DST:

         case ID_MDAT:

             iff->body_pos = avio_tell(pb);

             iff->body_end = iff->body_pos + data_size;

             iff->body_size = data_size;

             if (chunk_id == ID_DST) {
                 int ret = read_dst_frame(s, NULL);
                 if (ret < 0)
                     return ret;
             }

             break;
 
         case ID_CHAN:

             if (data_size < 4)
                 return AVERROR_INVALIDDATA;

             if (avio_rb32(pb) < 6) {

                 st->codecpar->channels       = 1;
                 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;

             } else {

                 st->codecpar->channels       = 2;
                 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;

             }

             break;
 

         case ID_CAMG:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             screenmode                = avio_rb32(pb);
             break;
 

         case ID_CMAP:

             if (data_size < 3 || data_size > 768 || data_size % 3) {

                  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %"PRIu64"\n",

                         data_size);
                  return AVERROR_INVALIDDATA;
             }

             st->codecpar->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
             st->codecpar->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);

             if (!st->codecpar->extradata)

                 return AVERROR(ENOMEM);

             if (avio_read(pb, st->codecpar->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)

                 return AVERROR(EIO);
             break;
 
         case ID_BMHD:

             st->codecpar->codec_type            = AVMEDIA_TYPE_VIDEO;

             if (data_size <= 8)
                 return AVERROR_INVALIDDATA;

             st->codecpar->width                 = avio_rb16(pb);
             st->codecpar->height                = avio_rb16(pb);

             avio_skip(pb, 4); // x, y offset

             st->codecpar->bits_per_coded_sample = avio_r8(pb);

             if (data_size >= 10)
                 masking                      = avio_r8(pb);
             if (data_size >= 11)

                 iff->bitmap_compression      = avio_r8(pb);

             if (data_size >= 14) {
                 avio_skip(pb, 1); // padding
                 transparency                 = avio_rb16(pb);

             }
             if (data_size >= 16) {

                 st->sample_aspect_ratio.num  = avio_r8(pb);
                 st->sample_aspect_ratio.den  = avio_r8(pb);

             }

             break;
 

         case ID_ANHD:
             break;
 

         case ID_DPAN:
             avio_skip(pb, 2);
             st->duration = avio_rb16(pb);
             break;
 

         case ID_DPEL:
             if (data_size < 4 || (data_size & 3))
                 return AVERROR_INVALIDDATA;
             if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
                 return fmt_size;
             if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))

                 st->codecpar->format = AV_PIX_FMT_RGB24;

             else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))

                 st->codecpar->format = AV_PIX_FMT_RGBA;

             else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))

                 st->codecpar->format = AV_PIX_FMT_BGRA;

             else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))

                 st->codecpar->format = AV_PIX_FMT_ARGB;

             else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))

                 st->codecpar->format = AV_PIX_FMT_ABGR;

             else {

                 avpriv_request_sample(s, "color format %.16s", fmt);

                 return AVERROR_PATCHWELCOME;
             }
             break;
 
         case ID_DGBL:

             st->codecpar->codec_type         = AVMEDIA_TYPE_VIDEO;

             if (data_size < 8)
                 return AVERROR_INVALIDDATA;

             st->codecpar->width              = avio_rb16(pb);
             st->codecpar->height             = avio_rb16(pb);

             iff->bitmap_compression          = avio_rb16(pb);
             st->sample_aspect_ratio.num      = avio_r8(pb);
             st->sample_aspect_ratio.den      = avio_r8(pb);

             st->codecpar->bits_per_coded_sample = 24;

             break;
 

         case ID_DLOC:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;

             st->codecpar->width  = avio_rb16(pb);
             st->codecpar->height = avio_rb16(pb);

             break;
 

         case ID_TVDC:
             if (data_size < sizeof(iff->tvdc))
                 return AVERROR_INVALIDDATA;
             res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
             if (res < 0)
                 return res;
             break;
 

         case ID_ANNO:

         case ID_TEXT:      metadata_tag = "comment";   break;
         case ID_AUTH:      metadata_tag = "artist";    break;
         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
         case ID_NAME:      metadata_tag = "title";     break;

 
         /* DSD tags */
 
         case MKTAG('F','V','E','R'):
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             version = avio_rb32(pb);
             av_log(s, AV_LOG_DEBUG, "DSIFF v%d.%d.%d.%d\n",version >> 24, (version >> 16) & 0xFF, (version >> 8) & 0xFF, version & 0xFF);

             st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

             break;
 
         case MKTAG('D','I','I','N'):
             res = parse_dsd_diin(s, st, orig_pos + data_size);
             if (res < 0)
                 return res;
             break;
 
         case MKTAG('P','R','O','P'):
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             if (avio_rl32(pb) != MKTAG('S','N','D',' ')) {
                 avpriv_request_sample(s, "unknown property type");
                 break;
             }
             res = parse_dsd_prop(s, st, orig_pos + data_size);
             if (res < 0)
                 return res;
             break;
 
         case MKTAG('C','O','M','T'):
             if (data_size < 2)
                 return AVERROR_INVALIDDATA;
             nb_comments = avio_rb16(pb);
             for (i = 0; i < nb_comments; i++) {
                 int year, mon, day, hour, min, type, ref;
                 char tmp[24];
                 const char *tag;
                 int metadata_size;
 
                 year = avio_rb16(pb);
                 mon  = avio_r8(pb);
                 day  = avio_r8(pb);
                 hour = avio_r8(pb);
                 min  = avio_r8(pb);
                 snprintf(tmp, sizeof(tmp), "%04d-%02d-%02d %02d:%02d", year, mon, day, hour, min);
                 av_dict_set(&st->metadata, "comment_time", tmp, 0);
 
                 type = avio_rb16(pb);
                 ref  = avio_rb16(pb);
                 switch (type) {
                 case 1:
                     if (!i)
                         tag = "channel_comment";
                     else {
                         snprintf(tmp, sizeof(tmp), "channel%d_comment", ref);
                         tag = tmp;
                     }
                     break;
                 case 2:

                     tag = ref < FF_ARRAY_ELEMS(dsd_source_comment) ? dsd_source_comment[ref] : "source_comment";

                     break;
                 case 3:
                     tag = ref < FF_ARRAY_ELEMS(dsd_history_comment) ? dsd_history_comment[ref] : "file_history";
                     break;
                 default:
                     tag = "comment";
                 }
 
                 metadata_size  = avio_rb32(pb);
                 if ((res = get_metadata(s, tag, metadata_size)) < 0) {
                     av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", tag);
                     return res;
                 }
 
                 if (metadata_size & 1)
                     avio_skip(pb, 1);
             }
             break;

         }

         if (metadata_tag) {
             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {

                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);

                 return res;
             }
         }

         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));

     }
 

     if (st->codecpar->codec_tag == ID_ANIM)
         avio_seek(pb, 12, SEEK_SET);
     else
         avio_seek(pb, iff->body_pos, SEEK_SET);

     switch(st->codecpar->codec_type) {

     case AVMEDIA_TYPE_AUDIO:

         avpriv_set_pts_info(st, 32, 1, st->codecpar->sample_rate);

         if (st->codecpar->codec_tag == ID_16SV)
             st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
         else if (st->codecpar->codec_tag == ID_MAUD) {

             if (iff->maud_bits == 8 && !iff->maud_compression) {

                 st->codecpar->codec_id = AV_CODEC_ID_PCM_U8;

             } else if (iff->maud_bits == 16 && !iff->maud_compression) {

                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;

             } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {

                 st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW;

             } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {

                 st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW;

             } else {

                 avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);

                 return AVERROR_PATCHWELCOME;
             }

         } else if (st->codecpar->codec_tag != ID_DSD &&
                    st->codecpar->codec_tag != ID_DST) {

             switch (iff->svx8_compression) {
             case COMP_NONE:

                 st->codecpar->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;

                 break;
             case COMP_FIB:

                 st->codecpar->codec_id = AV_CODEC_ID_8SVX_FIB;

                 break;
             case COMP_EXP:

                 st->codecpar->codec_id = AV_CODEC_ID_8SVX_EXP;

                 break;
             default:
                 av_log(s, AV_LOG_ERROR,
                        "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
                 return -1;
             }

         }

         st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id);

         st->codecpar->bit_rate = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample;

         st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;

         if (st->codecpar->codec_tag == ID_DSD && st->codecpar->block_align <= 0)
             return AVERROR_INVALIDDATA;

         break;

     case AVMEDIA_TYPE_VIDEO:

         iff->bpp          = st->codecpar->bits_per_coded_sample;

         if (st->codecpar->codec_tag == ID_ANIM)
             avpriv_set_pts_info(st, 32, 1, 60);

         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
             iff->ham      = iff->bpp > 6 ? 6 : 4;

             st->codecpar->bits_per_coded_sample = 24;

         }
         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
         iff->masking      = masking;
         iff->transparency = transparency;
 

         if (!st->codecpar->extradata) {
             st->codecpar->extradata_size = IFF_EXTRA_VIDEO_SIZE;
             st->codecpar->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codecpar->extradata)

                 return AVERROR(ENOMEM);
         }

         av_assert0(st->codecpar->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
         buf = st->codecpar->extradata;

         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);

         bytestream_put_byte(&buf, iff->bitmap_compression);

         bytestream_put_byte(&buf, iff->bpp);
         bytestream_put_byte(&buf, iff->ham);
         bytestream_put_byte(&buf, iff->flags);
         bytestream_put_be16(&buf, iff->transparency);
         bytestream_put_byte(&buf, iff->masking);

         bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));

         st->codecpar->codec_id = AV_CODEC_ID_IFF_ILBM;

         break;
     default:
         return -1;
     }

 
     return 0;
 }
 

 static unsigned get_anim_duration(uint8_t *buf, int size)
 {
     GetByteContext gb;
 
     bytestream2_init(&gb, buf, size);
     bytestream2_skip(&gb, 4);
     while (bytestream2_get_bytes_left(&gb) > 8) {
         unsigned chunk = bytestream2_get_le32(&gb);
         unsigned size = bytestream2_get_be32(&gb);
 
         if (chunk == ID_ANHD) {
             if (size < 40)
                 break;
             bytestream2_skip(&gb, 14);
             return bytestream2_get_be32(&gb);
         } else {
             bytestream2_skip(&gb, size + size & 1);
         }
     }
     return 10;
 }
 

 static int iff_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     IffDemuxContext *iff = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream *st = s->streams[0];

     int ret;

     int64_t pos = avio_tell(pb);

     if (avio_feof(pb))
         return AVERROR_EOF;
     if (st->codecpar->codec_tag != ID_ANIM && pos >= iff->body_end)

         return AVERROR_EOF;

     if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
         if (st->codecpar->codec_tag == ID_DSD || st->codecpar->codec_tag == ID_MAUD) {
             ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codecpar->block_align));

         } else if (st->codecpar->codec_tag == ID_DST) {
             return read_dst_frame(s, pkt);

         } else {

             if (iff->body_size > INT_MAX)
                 return AVERROR_INVALIDDATA;

             ret = av_get_packet(pb, pkt, iff->body_size);
         }

     } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
                st->codecpar->codec_tag  == ID_ANIM) {
         uint64_t data_size, orig_pos;

         uint32_t chunk_id, chunk_id2;

         while (!avio_feof(pb)) {
             if (avio_feof(pb))
                 return AVERROR_EOF;
 

             orig_pos  = avio_tell(pb);

             chunk_id  = avio_rl32(pb);
             data_size = avio_rb32(pb);

             chunk_id2 = avio_rl32(pb);

             if (chunk_id  == ID_FORM &&
                 chunk_id2 == ID_ILBM) {
                 avio_skip(pb, -4);

                 break;

             } else if (chunk_id == ID_FORM &&
                        chunk_id2 == ID_ANIM) {
                 continue;
             } else {

                 avio_skip(pb, data_size);

             }

         }
         ret = av_get_packet(pb, pkt, data_size);
         pkt->pos = orig_pos;
         pkt->duration = get_anim_duration(pkt->data, pkt->size);
         if (pos == 12)
             pkt->flags |= AV_PKT_FLAG_KEY;
     } else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
                st->codecpar->codec_tag  != ID_ANIM) {
         ret = av_get_packet(pb, pkt, iff->body_size);
         pkt->pos = pos;
         if (pos == iff->body_pos)
             pkt->flags |= AV_PKT_FLAG_KEY;

     } else {

         av_assert0(0);

     }

     if (ret < 0)
         return ret;

     pkt->stream_index = 0;
     return ret;
 }
 

 AVInputFormat ff_iff_demuxer = {

     .name           = "iff",

     .long_name      = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),

     .priv_data_size = sizeof(IffDemuxContext),
     .read_probe     = iff_probe,
     .read_header    = iff_read_header,
     .read_packet    = iff_read_packet,

     .flags          = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,

 };