yading@11: /*
yading@11:  * Copyright (c) 2008 Jaikrishnan Menon <realityman@gmx.net>
yading@11:  * Copyright (c) 2010 Peter Ross <pross@xvid.org>
yading@11:  * Copyright (c) 2010 Sebastian Vater <cdgs.basty@googlemail.com>
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * IFF file demuxer
yading@11:  * by Jaikrishnan Menon
yading@11:  * for more information on the .iff file format, visit:
yading@11:  * http://wiki.multimedia.cx/index.php?title=IFF
yading@11:  */
yading@11: 
yading@11: #include "libavutil/avassert.h"
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "libavcodec/bytestream.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: #define ID_8SVX       MKTAG('8','S','V','X')
yading@11: #define ID_16SV       MKTAG('1','6','S','V')
yading@11: #define ID_MAUD       MKTAG('M','A','U','D')
yading@11: #define ID_MHDR       MKTAG('M','H','D','R')
yading@11: #define ID_MDAT       MKTAG('M','D','A','T')
yading@11: #define ID_VHDR       MKTAG('V','H','D','R')
yading@11: #define ID_ATAK       MKTAG('A','T','A','K')
yading@11: #define ID_RLSE       MKTAG('R','L','S','E')
yading@11: #define ID_CHAN       MKTAG('C','H','A','N')
yading@11: #define ID_PBM        MKTAG('P','B','M',' ')
yading@11: #define ID_ILBM       MKTAG('I','L','B','M')
yading@11: #define ID_BMHD       MKTAG('B','M','H','D')
yading@11: #define ID_DGBL       MKTAG('D','G','B','L')
yading@11: #define ID_CAMG       MKTAG('C','A','M','G')
yading@11: #define ID_CMAP       MKTAG('C','M','A','P')
yading@11: #define ID_ACBM       MKTAG('A','C','B','M')
yading@11: #define ID_DEEP       MKTAG('D','E','E','P')
yading@11: #define ID_RGB8       MKTAG('R','G','B','8')
yading@11: #define ID_RGBN       MKTAG('R','G','B','N')
yading@11: 
yading@11: #define ID_FORM       MKTAG('F','O','R','M')
yading@11: #define ID_ANNO       MKTAG('A','N','N','O')
yading@11: #define ID_AUTH       MKTAG('A','U','T','H')
yading@11: #define ID_CHRS       MKTAG('C','H','R','S')
yading@11: #define ID_COPYRIGHT  MKTAG('(','c',')',' ')
yading@11: #define ID_CSET       MKTAG('C','S','E','T')
yading@11: #define ID_FVER       MKTAG('F','V','E','R')
yading@11: #define ID_NAME       MKTAG('N','A','M','E')
yading@11: #define ID_TEXT       MKTAG('T','E','X','T')
yading@11: #define ID_ABIT       MKTAG('A','B','I','T')
yading@11: #define ID_BODY       MKTAG('B','O','D','Y')
yading@11: #define ID_DBOD       MKTAG('D','B','O','D')
yading@11: #define ID_DPEL       MKTAG('D','P','E','L')
yading@11: #define ID_DLOC       MKTAG('D','L','O','C')
yading@11: #define ID_TVDC       MKTAG('T','V','D','C')
yading@11: 
yading@11: #define LEFT    2
yading@11: #define RIGHT   4
yading@11: #define STEREO  6
yading@11: 
yading@11: /**
yading@11:  * This number of bytes if added at the beginning of each AVPacket
yading@11:  * which contain additional information about video properties
yading@11:  * which has to be shared between demuxer and decoder.
yading@11:  * This number may change between frames, e.g. the demuxer might
yading@11:  * set it to smallest possible size of 2 to indicate that there's
yading@11:  * no extradata changing in this frame.
yading@11:  */
yading@11: #define IFF_EXTRA_VIDEO_SIZE 41
yading@11: 
yading@11: typedef enum {
yading@11:     COMP_NONE,
yading@11:     COMP_FIB,
yading@11:     COMP_EXP
yading@11: } svx8_compression_type;
yading@11: 
yading@11: typedef struct {
yading@11:     int64_t  body_pos;
yading@11:     int64_t  body_end;
yading@11:     uint32_t  body_size;
yading@11:     svx8_compression_type   svx8_compression;
yading@11:     unsigned  maud_bits;
yading@11:     unsigned  maud_compression;
yading@11:     unsigned  bitmap_compression;  ///< delta compression method used
yading@11:     unsigned  bpp;          ///< bits per plane to decode (differs from bits_per_coded_sample if HAM)
yading@11:     unsigned  ham;          ///< 0 if non-HAM or number of hold bits (6 for bpp > 6, 4 otherwise)
yading@11:     unsigned  flags;        ///< 1 for EHB, 0 is no extra half darkening
yading@11:     unsigned  transparency; ///< transparency color index in palette
yading@11:     unsigned  masking;      ///< masking method used
yading@11:     uint8_t   tvdc[32];     ///< TVDC lookup table
yading@11: } IffDemuxContext;
yading@11: 
yading@11: /* Metadata string read */
yading@11: static int get_metadata(AVFormatContext *s,
yading@11:                         const char *const tag,
yading@11:                         const unsigned data_size)
yading@11: {
yading@11:     uint8_t *buf = ((data_size + 1) == 0) ? NULL : av_malloc(data_size + 1);
yading@11: 
yading@11:     if (!buf)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     if (avio_read(s->pb, buf, data_size) < 0) {
yading@11:         av_free(buf);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     buf[data_size] = 0;
yading@11:     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int iff_probe(AVProbeData *p)
yading@11: {
yading@11:     const uint8_t *d = p->buf;
yading@11: 
yading@11:     if (  AV_RL32(d)   == ID_FORM &&
yading@11:          (AV_RL32(d+8) == ID_8SVX ||
yading@11:           AV_RL32(d+8) == ID_16SV ||
yading@11:           AV_RL32(d+8) == ID_MAUD ||
yading@11:           AV_RL32(d+8) == ID_PBM  ||
yading@11:           AV_RL32(d+8) == ID_ACBM ||
yading@11:           AV_RL32(d+8) == ID_DEEP ||
yading@11:           AV_RL32(d+8) == ID_ILBM ||
yading@11:           AV_RL32(d+8) == ID_RGB8 ||
yading@11:           AV_RL32(d+8) == ID_RGBN) )
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static const uint8_t deep_rgb24[] = {0, 0, 0, 3, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
yading@11: static const uint8_t deep_rgba[]  = {0, 0, 0, 4, 0, 1, 0, 8, 0, 2, 0, 8, 0, 3, 0, 8};
yading@11: static const uint8_t deep_bgra[]  = {0, 0, 0, 4, 0, 3, 0, 8, 0, 2, 0, 8, 0, 1, 0, 8};
yading@11: static const uint8_t deep_argb[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 1, 0, 8, 0, 2, 0, 8};
yading@11: static const uint8_t deep_abgr[]  = {0, 0, 0, 4, 0,17, 0, 8, 0, 3, 0, 8, 0, 2, 0, 8};
yading@11: 
yading@11: static int iff_read_header(AVFormatContext *s)
yading@11: {
yading@11:     IffDemuxContext *iff = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st;
yading@11:     uint8_t *buf;
yading@11:     uint32_t chunk_id, data_size;
yading@11:     uint32_t screenmode = 0, num, den;
yading@11:     unsigned transparency = 0;
yading@11:     unsigned masking = 0; // no mask
yading@11:     uint8_t fmt[16];
yading@11:     int fmt_size;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     st->codec->channels = 1;
yading@11:     st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:     avio_skip(pb, 8);
yading@11:     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
yading@11:     st->codec->codec_tag = avio_rl32(pb);
yading@11:     iff->bitmap_compression = -1;
yading@11:     iff->svx8_compression = -1;
yading@11:     iff->maud_bits = -1;
yading@11:     iff->maud_compression = -1;
yading@11: 
yading@11:     while(!url_feof(pb)) {
yading@11:         uint64_t orig_pos;
yading@11:         int res;
yading@11:         const char *metadata_tag = NULL;
yading@11:         chunk_id = avio_rl32(pb);
yading@11:         data_size = avio_rb32(pb);
yading@11:         orig_pos = avio_tell(pb);
yading@11: 
yading@11:         switch(chunk_id) {
yading@11:         case ID_VHDR:
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11: 
yading@11:             if (data_size < 14)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             avio_skip(pb, 12);
yading@11:             st->codec->sample_rate = avio_rb16(pb);
yading@11:             if (data_size >= 16) {
yading@11:                 avio_skip(pb, 1);
yading@11:                 iff->svx8_compression = avio_r8(pb);
yading@11:             }
yading@11:             break;
yading@11: 
yading@11:         case ID_MHDR:
yading@11:             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11: 
yading@11:             if (data_size < 32)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             avio_skip(pb, 4);
yading@11:             iff->maud_bits = avio_rb16(pb);
yading@11:             avio_skip(pb, 2);
yading@11:             num = avio_rb32(pb);
yading@11:             den = avio_rb16(pb);
yading@11:             if (!den)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             avio_skip(pb, 2);
yading@11:             st->codec->sample_rate = num / den;
yading@11:             st->codec->channels = avio_rb16(pb);
yading@11:             iff->maud_compression = avio_rb16(pb);
yading@11:             if (st->codec->channels == 1)
yading@11:                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:             else if (st->codec->channels == 2)
yading@11:                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:             break;
yading@11: 
yading@11:         case ID_ABIT:
yading@11:         case ID_BODY:
yading@11:         case ID_DBOD:
yading@11:         case ID_MDAT:
yading@11:             iff->body_pos = avio_tell(pb);
yading@11:             iff->body_end = iff->body_pos + data_size;
yading@11:             iff->body_size = data_size;
yading@11:             break;
yading@11: 
yading@11:         case ID_CHAN:
yading@11:             if (data_size < 4)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             if (avio_rb32(pb) < 6) {
yading@11:                 st->codec->channels       = 1;
yading@11:                 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:             } else {
yading@11:                 st->codec->channels       = 2;
yading@11:                 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:             }
yading@11:             break;
yading@11: 
yading@11:         case ID_CAMG:
yading@11:             if (data_size < 4)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             screenmode                = avio_rb32(pb);
yading@11:             break;
yading@11: 
yading@11:         case ID_CMAP:
yading@11:             if (data_size < 3 || data_size > 768 || data_size % 3) {
yading@11:                  av_log(s, AV_LOG_ERROR, "Invalid CMAP chunk size %d\n",
yading@11:                         data_size);
yading@11:                  return AVERROR_INVALIDDATA;
yading@11:             }
yading@11:             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
yading@11:             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:             if (!st->codec->extradata)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
yading@11:                 return AVERROR(EIO);
yading@11:             break;
yading@11: 
yading@11:         case ID_BMHD:
yading@11:             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
yading@11:             if (data_size <= 8)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             st->codec->width                 = avio_rb16(pb);
yading@11:             st->codec->height                = avio_rb16(pb);
yading@11:             avio_skip(pb, 4); // x, y offset
yading@11:             st->codec->bits_per_coded_sample = avio_r8(pb);
yading@11:             if (data_size >= 10)
yading@11:                 masking                      = avio_r8(pb);
yading@11:             if (data_size >= 11)
yading@11:                 iff->bitmap_compression      = avio_r8(pb);
yading@11:             if (data_size >= 14) {
yading@11:                 avio_skip(pb, 1); // padding
yading@11:                 transparency                 = avio_rb16(pb);
yading@11:             }
yading@11:             if (data_size >= 16) {
yading@11:                 st->sample_aspect_ratio.num  = avio_r8(pb);
yading@11:                 st->sample_aspect_ratio.den  = avio_r8(pb);
yading@11:             }
yading@11:             break;
yading@11: 
yading@11:         case ID_DPEL:
yading@11:             if (data_size < 4 || (data_size & 3))
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             if ((fmt_size = avio_read(pb, fmt, sizeof(fmt))) < 0)
yading@11:                 return fmt_size;
yading@11:             if (fmt_size == sizeof(deep_rgb24) && !memcmp(fmt, deep_rgb24, sizeof(deep_rgb24)))
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_RGB24;
yading@11:             else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_RGBA;
yading@11:             else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_BGRA;
yading@11:             else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_ARGB;
yading@11:             else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
yading@11:                 st->codec->pix_fmt = AV_PIX_FMT_ABGR;
yading@11:             else {
yading@11:                 avpriv_request_sample(s, "color format %.16s", fmt);
yading@11:                 return AVERROR_PATCHWELCOME;
yading@11:             }
yading@11:             break;
yading@11: 
yading@11:         case ID_DGBL:
yading@11:             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
yading@11:             if (data_size < 8)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             st->codec->width                 = avio_rb16(pb);
yading@11:             st->codec->height                = avio_rb16(pb);
yading@11:             iff->bitmap_compression          = avio_rb16(pb);
yading@11:             st->sample_aspect_ratio.num      = avio_r8(pb);
yading@11:             st->sample_aspect_ratio.den      = avio_r8(pb);
yading@11:             st->codec->bits_per_coded_sample = 24;
yading@11:             break;
yading@11: 
yading@11:         case ID_DLOC:
yading@11:             if (data_size < 4)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             st->codec->width  = avio_rb16(pb);
yading@11:             st->codec->height = avio_rb16(pb);
yading@11:             break;
yading@11: 
yading@11:         case ID_TVDC:
yading@11:             if (data_size < sizeof(iff->tvdc))
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             res = avio_read(pb, iff->tvdc, sizeof(iff->tvdc));
yading@11:             if (res < 0)
yading@11:                 return res;
yading@11:             break;
yading@11: 
yading@11:         case ID_ANNO:
yading@11:         case ID_TEXT:      metadata_tag = "comment";   break;
yading@11:         case ID_AUTH:      metadata_tag = "artist";    break;
yading@11:         case ID_COPYRIGHT: metadata_tag = "copyright"; break;
yading@11:         case ID_NAME:      metadata_tag = "title";     break;
yading@11:         }
yading@11: 
yading@11:         if (metadata_tag) {
yading@11:             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!\n", metadata_tag);
yading@11:                 return res;
yading@11:             }
yading@11:         }
yading@11:         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
yading@11:     }
yading@11: 
yading@11:     avio_seek(pb, iff->body_pos, SEEK_SET);
yading@11: 
yading@11:     switch(st->codec->codec_type) {
yading@11:     case AVMEDIA_TYPE_AUDIO:
yading@11:         avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);
yading@11: 
yading@11:         if (st->codec->codec_tag == ID_16SV)
yading@11:             st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
yading@11:         else if (st->codec->codec_tag == ID_MAUD) {
yading@11:             if (iff->maud_bits == 8 && !iff->maud_compression) {
yading@11:                 st->codec->codec_id = AV_CODEC_ID_PCM_U8;
yading@11:             } else if (iff->maud_bits == 16 && !iff->maud_compression) {
yading@11:                 st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
yading@11:             } else if (iff->maud_bits ==  8 && iff->maud_compression == 2) {
yading@11:                 st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
yading@11:             } else if (iff->maud_bits ==  8 && iff->maud_compression == 3) {
yading@11:                 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
yading@11:             } else {
yading@11:                 avpriv_request_sample(s, "compression %d and bit depth %d", iff->maud_compression, iff->maud_bits);
yading@11:                 return AVERROR_PATCHWELCOME;
yading@11:             }
yading@11: 
yading@11:             st->codec->bits_per_coded_sample =
yading@11:                 av_get_bits_per_sample(st->codec->codec_id);
yading@11: 
yading@11:             st->codec->block_align =
yading@11:                 st->codec->bits_per_coded_sample * st->codec->channels / 8;
yading@11:         } else {
yading@11:         switch (iff->svx8_compression) {
yading@11:         case COMP_NONE:
yading@11:             st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
yading@11:             break;
yading@11:         case COMP_FIB:
yading@11:             st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
yading@11:             break;
yading@11:         case COMP_EXP:
yading@11:             st->codec->codec_id = AV_CODEC_ID_8SVX_EXP;
yading@11:             break;
yading@11:         default:
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
yading@11:             return -1;
yading@11:         }
yading@11:         }
yading@11: 
yading@11:         st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
yading@11:         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
yading@11:         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
yading@11:         break;
yading@11: 
yading@11:     case AVMEDIA_TYPE_VIDEO:
yading@11:         iff->bpp          = st->codec->bits_per_coded_sample;
yading@11:         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
yading@11:             iff->ham      = iff->bpp > 6 ? 6 : 4;
yading@11:             st->codec->bits_per_coded_sample = 24;
yading@11:         }
yading@11:         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
yading@11:         iff->masking      = masking;
yading@11:         iff->transparency = transparency;
yading@11: 
yading@11:         if (!st->codec->extradata) {
yading@11:             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
yading@11:             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:             if (!st->codec->extradata)
yading@11:                 return AVERROR(ENOMEM);
yading@11:         }
yading@11:         av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
yading@11:         buf = st->codec->extradata;
yading@11:         bytestream_put_be16(&buf, IFF_EXTRA_VIDEO_SIZE);
yading@11:         bytestream_put_byte(&buf, iff->bitmap_compression);
yading@11:         bytestream_put_byte(&buf, iff->bpp);
yading@11:         bytestream_put_byte(&buf, iff->ham);
yading@11:         bytestream_put_byte(&buf, iff->flags);
yading@11:         bytestream_put_be16(&buf, iff->transparency);
yading@11:         bytestream_put_byte(&buf, iff->masking);
yading@11:         bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
yading@11:         st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
yading@11:         break;
yading@11:     default:
yading@11:         return -1;
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int iff_read_packet(AVFormatContext *s,
yading@11:                            AVPacket *pkt)
yading@11: {
yading@11:     IffDemuxContext *iff = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream *st = s->streams[0];
yading@11:     int ret;
yading@11:     int64_t pos = avio_tell(pb);
yading@11: 
yading@11:     if (pos >= iff->body_end)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
yading@11:         if (st->codec->codec_tag == ID_MAUD) {
yading@11:             ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
yading@11:         } else {
yading@11:             ret = av_get_packet(pb, pkt, iff->body_size);
yading@11:         }
yading@11:     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
yading@11:         uint8_t *buf;
yading@11: 
yading@11:         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
yading@11:             return AVERROR(ENOMEM);
yading@11:         }
yading@11: 
yading@11:         buf = pkt->data;
yading@11:         bytestream_put_be16(&buf, 2);
yading@11:         ret = avio_read(pb, buf, iff->body_size);
yading@11:     } else {
yading@11:         av_assert0(0);
yading@11:     }
yading@11: 
yading@11:     if (pos == iff->body_pos)
yading@11:         pkt->flags |= AV_PKT_FLAG_KEY;
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     pkt->stream_index = 0;
yading@11:     return ret;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_iff_demuxer = {
yading@11:     .name           = "iff",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("IFF (Interchange File Format)"),
yading@11:     .priv_data_size = sizeof(IffDemuxContext),
yading@11:     .read_probe     = iff_probe,
yading@11:     .read_header    = iff_read_header,
yading@11:     .read_packet    = iff_read_packet,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };