libavformat/iff.c - third_party/ffmpeg - Git at Google

 /*
  * 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 "libavcodec/bytestream.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/dict.h"
 #include "avformat.h"
 #include "internal.h"

 #define ID_8SVX       MKTAG('8','S','V','X')
 #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_CAMG       MKTAG('C','A','M','G')
 #define ID_CMAP       MKTAG('C','M','A','P')
 #define ID_ACBM       MKTAG('A','C','B','M')

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

 #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 9

 typedef enum {
     COMP_NONE,
     COMP_FIB,
     COMP_EXP
 } svx8_compression_type;

 typedef enum {
     BITMAP_RAW,
     BITMAP_BYTERUN1
 } bitmap_compression_type;

 typedef struct {
     uint64_t  body_pos;
     uint32_t  body_size;
     uint32_t  sent_bytes;
     svx8_compression_type   svx8_compression;
     bitmap_compression_type 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
 } 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) < 0) {
         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_PBM || AV_RL32(d+8) == ID_ILBM || AV_RL32(d+8) == ID_ACBM) )
         return AVPROBE_SCORE_MAX;
     return 0;
 }

 static int iff_read_header(AVFormatContext *s,
                            AVFormatParameters *ap)
 {
     IffDemuxContext *iff = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st;
     uint8_t *buf;
     uint32_t chunk_id, data_size;
     uint32_t screenmode = 0;
     unsigned transparency = 0;
     unsigned masking = 0; // no mask

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

     st->codec->channels = 1;
     avio_skip(pb, 8);
     // codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
     st->codec->codec_tag = avio_rl32(pb);

     while(!url_feof(pb)) {
         uint64_t orig_pos;
         int res;
         const char *metadata_tag = NULL;
         chunk_id = avio_rl32(pb);
         data_size = avio_rb32(pb);
         orig_pos = avio_tell(pb);

         switch(chunk_id) {
         case ID_VHDR:
             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

             if (data_size < 14)
                 return AVERROR_INVALIDDATA;
             avio_skip(pb, 12);
             st->codec->sample_rate = avio_rb16(pb);
             if (data_size >= 16) {
                 avio_skip(pb, 1);
                 iff->svx8_compression = avio_r8(pb);
             }
             break;

         case ID_ABIT:
         case ID_BODY:
             iff->body_pos = avio_tell(pb);
             iff->body_size = data_size;
             break;

         case ID_CHAN:
             if (data_size < 4)
                 return AVERROR_INVALIDDATA;
             st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
             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 %d\n",
                         data_size);
                  return AVERROR_INVALIDDATA;
             }
             st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
             st->codec->extradata      = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);
             if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
                 return AVERROR(EIO);
             break;

         case ID_BMHD:
             iff->bitmap_compression = -1;
             st->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
             if (data_size <= 8)
                 return AVERROR_INVALIDDATA;
             st->codec->width                 = avio_rb16(pb);
             st->codec->height                = avio_rb16(pb);
             avio_skip(pb, 4); // x, y offset
             st->codec->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_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;
         }

         if (metadata_tag) {
             if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
                 av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
                 return res;
             }
         }
         avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
     }

     avio_seek(pb, iff->body_pos, SEEK_SET);

     switch(st->codec->codec_type) {
     case AVMEDIA_TYPE_AUDIO:
         avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);

         switch (iff->svx8_compression) {
         case COMP_NONE:
             st->codec->codec_id = CODEC_ID_PCM_S8_PLANAR;
             break;
         case COMP_FIB:
             st->codec->codec_id = CODEC_ID_8SVX_FIB;
             break;
         case COMP_EXP:
             st->codec->codec_id = CODEC_ID_8SVX_EXP;
             break;
         default:
             av_log(s, AV_LOG_ERROR,
                    "Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
             return -1;
         }

         st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
         st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
         break;

     case AVMEDIA_TYPE_VIDEO:
         iff->bpp          = st->codec->bits_per_coded_sample;
         if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
             iff->ham      = iff->bpp > 6 ? 6 : 4;
             st->codec->bits_per_coded_sample = 24;
         }
         iff->flags        = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
         iff->masking      = masking;
         iff->transparency = transparency;

         if (!st->codec->extradata) {
             st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
             st->codec->extradata      = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);
         }
         buf = st->codec->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);

         switch (iff->bitmap_compression) {
         case BITMAP_RAW:
             st->codec->codec_id = CODEC_ID_IFF_ILBM;
             break;
         case BITMAP_BYTERUN1:
             st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
             break;
         default:
             av_log(s, AV_LOG_ERROR,
                    "Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
             return AVERROR_INVALIDDATA;
         }
         break;
     default:
         return -1;
     }

     return 0;
 }

 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;

     if(iff->sent_bytes >= iff->body_size)
         return AVERROR_EOF;

     if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
         ret = av_get_packet(pb, pkt, iff->body_size);
     } else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
         uint8_t *buf;

         if (av_new_packet(pkt, iff->body_size + 2) < 0) {
             return AVERROR(ENOMEM);
         }

         buf = pkt->data;
         bytestream_put_be16(&buf, 2);
         ret = avio_read(pb, buf, iff->body_size);
     } else {
         av_abort();
     }

     if(iff->sent_bytes == 0)
         pkt->flags |= AV_PKT_FLAG_KEY;
     iff->sent_bytes = iff->body_size;

     pkt->stream_index = 0;
     return ret;
 }

 AVInputFormat ff_iff_demuxer = {
     .name           = "IFF",
     .long_name      = NULL_IF_CONFIG_SMALL("IFF format"),
     .priv_data_size = sizeof(IffDemuxContext),
     .read_probe     = iff_probe,
     .read_header    = iff_read_header,
     .read_packet    = iff_read_packet,
 };
	/*
	* 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 "libavcodec/bytestream.h"
	#include "libavutil/intreadwrite.h"
	#include "libavutil/dict.h"
	#include "avformat.h"
	#include "internal.h"

	#define ID_8SVX MKTAG('8','S','V','X')
	#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_CAMG MKTAG('C','A','M','G')
	#define ID_CMAP MKTAG('C','M','A','P')
	#define ID_ACBM MKTAG('A','C','B','M')

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

	#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 9

	typedef enum {
	COMP_NONE,
	COMP_FIB,
	COMP_EXP
	} svx8_compression_type;

	typedef enum {
	BITMAP_RAW,
	BITMAP_BYTERUN1
	} bitmap_compression_type;

	typedef struct {
	uint64_t body_pos;
	uint32_t body_size;
	uint32_t sent_bytes;
	svx8_compression_type svx8_compression;
	bitmap_compression_type 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
	} 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) < 0) {
	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_PBM \|\| AV_RL32(d+8) == ID_ILBM \|\| AV_RL32(d+8) == ID_ACBM) )
	return AVPROBE_SCORE_MAX;
	return 0;
	}

	static int iff_read_header(AVFormatContext *s,
	AVFormatParameters *ap)
	{
	IffDemuxContext *iff = s->priv_data;
	AVIOContext *pb = s->pb;
	AVStream *st;
	uint8_t *buf;
	uint32_t chunk_id, data_size;
	uint32_t screenmode = 0;
	unsigned transparency = 0;
	unsigned masking = 0; // no mask

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

	st->codec->channels = 1;
	avio_skip(pb, 8);
	// codec_tag used by ByteRun1 decoder to distinguish progressive (PBM) and interlaced (ILBM) content
	st->codec->codec_tag = avio_rl32(pb);

	while(!url_feof(pb)) {
	uint64_t orig_pos;
	int res;
	const char *metadata_tag = NULL;
	chunk_id = avio_rl32(pb);
	data_size = avio_rb32(pb);
	orig_pos = avio_tell(pb);

	switch(chunk_id) {
	case ID_VHDR:
	st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

	if (data_size < 14)
	return AVERROR_INVALIDDATA;
	avio_skip(pb, 12);
	st->codec->sample_rate = avio_rb16(pb);
	if (data_size >= 16) {
	avio_skip(pb, 1);
	iff->svx8_compression = avio_r8(pb);
	}
	break;

	case ID_ABIT:
	case ID_BODY:
	iff->body_pos = avio_tell(pb);
	iff->body_size = data_size;
	break;

	case ID_CHAN:
	if (data_size < 4)
	return AVERROR_INVALIDDATA;
	st->codec->channels = (avio_rb32(pb) < 6) ? 1 : 2;
	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 %d\n",
	data_size);
	return AVERROR_INVALIDDATA;
	}
	st->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
	st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
	if (!st->codec->extradata)
	return AVERROR(ENOMEM);
	if (avio_read(pb, st->codec->extradata + IFF_EXTRA_VIDEO_SIZE, data_size) < 0)
	return AVERROR(EIO);
	break;

	case ID_BMHD:
	iff->bitmap_compression = -1;
	st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
	if (data_size <= 8)
	return AVERROR_INVALIDDATA;
	st->codec->width = avio_rb16(pb);
	st->codec->height = avio_rb16(pb);
	avio_skip(pb, 4); // x, y offset
	st->codec->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_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;
	}

	if (metadata_tag) {
	if ((res = get_metadata(s, metadata_tag, data_size)) < 0) {
	av_log(s, AV_LOG_ERROR, "cannot allocate metadata tag %s!", metadata_tag);
	return res;
	}
	}
	avio_skip(pb, data_size - (avio_tell(pb) - orig_pos) + (data_size & 1));
	}

	avio_seek(pb, iff->body_pos, SEEK_SET);

	switch(st->codec->codec_type) {
	case AVMEDIA_TYPE_AUDIO:
	avpriv_set_pts_info(st, 32, 1, st->codec->sample_rate);

	switch (iff->svx8_compression) {
	case COMP_NONE:
	st->codec->codec_id = CODEC_ID_PCM_S8_PLANAR;
	break;
	case COMP_FIB:
	st->codec->codec_id = CODEC_ID_8SVX_FIB;
	break;
	case COMP_EXP:
	st->codec->codec_id = CODEC_ID_8SVX_EXP;
	break;
	default:
	av_log(s, AV_LOG_ERROR,
	"Unknown SVX8 compression method '%d'\n", iff->svx8_compression);
	return -1;
	}

	st->codec->bits_per_coded_sample = iff->svx8_compression == COMP_NONE ? 8 : 4;
	st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * st->codec->bits_per_coded_sample;
	st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
	break;

	case AVMEDIA_TYPE_VIDEO:
	iff->bpp = st->codec->bits_per_coded_sample;
	if ((screenmode & 0x800 /* Hold And Modify */) && iff->bpp <= 8) {
	iff->ham = iff->bpp > 6 ? 6 : 4;
	st->codec->bits_per_coded_sample = 24;
	}
	iff->flags = (screenmode & 0x80 /* Extra HalfBrite */) && iff->bpp <= 8;
	iff->masking = masking;
	iff->transparency = transparency;

	if (!st->codec->extradata) {
	st->codec->extradata_size = IFF_EXTRA_VIDEO_SIZE;
	st->codec->extradata = av_malloc(IFF_EXTRA_VIDEO_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
	if (!st->codec->extradata)
	return AVERROR(ENOMEM);
	}
	buf = st->codec->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);

	switch (iff->bitmap_compression) {
	case BITMAP_RAW:
	st->codec->codec_id = CODEC_ID_IFF_ILBM;
	break;
	case BITMAP_BYTERUN1:
	st->codec->codec_id = CODEC_ID_IFF_BYTERUN1;
	break;
	default:
	av_log(s, AV_LOG_ERROR,
	"Unknown bitmap compression method '%d'\n", iff->bitmap_compression);
	return AVERROR_INVALIDDATA;
	}
	break;
	default:
	return -1;
	}

	return 0;
	}

	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;

	if(iff->sent_bytes >= iff->body_size)
	return AVERROR_EOF;

	if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
	ret = av_get_packet(pb, pkt, iff->body_size);
	} else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
	uint8_t *buf;

	if (av_new_packet(pkt, iff->body_size + 2) < 0) {
	return AVERROR(ENOMEM);
	}

	buf = pkt->data;
	bytestream_put_be16(&buf, 2);
	ret = avio_read(pb, buf, iff->body_size);
	} else {
	av_abort();
	}

	if(iff->sent_bytes == 0)
	pkt->flags \|= AV_PKT_FLAG_KEY;
	iff->sent_bytes = iff->body_size;

	pkt->stream_index = 0;
	return ret;
	}

	AVInputFormat ff_iff_demuxer = {
	.name = "IFF",
	.long_name = NULL_IF_CONFIG_SMALL("IFF format"),
	.priv_data_size = sizeof(IffDemuxContext),
	.read_probe = iff_probe,
	.read_header = iff_read_header,
	.read_packet = iff_read_packet,
	};