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ffmpeg/libavformat/iff.c

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/*
* 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_ANIM MKTAG('A','N','I','M')
#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
} 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_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_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) {
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) {
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->codec->channels = avio_rb16(pb);
if (size < 2 + st->codec->channels * 4)
return AVERROR_INVALIDDATA;
st->codec->channel_layout = 0;
if (st->codec->channels > FF_ARRAY_ELEMS(dsd_layout)) {
avpriv_request_sample(s, "channel layout");
break;
}
for (i = 0; i < st->codec->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->codec->channels &&
!memcmp(d->dsd_layout, dsd_layout, st->codec->channels * sizeof(uint32_t))) {
st->codec->channel_layout = d->layout;
break;
}
}
break;
case MKTAG('C','M','P','R'):
if (size < 4)
return AVERROR_INVALIDDATA;
tag = avio_rl32(pb);
st->codec->codec_id = ff_codec_get_id(dsd_codec_tags, tag);
if (!st->codec->codec_id) {
av_log(s, AV_LOG_ERROR, "'%c%c%c%c' compression is not supported\n",
tag&0xFF, (tag>>8)&0xFF, (tag>>16)&0xFF, (tag>>24)&0xFF);
return AVERROR_PATCHWELCOME;
}
break;
case MKTAG('F','S',' ',' '):
if (size < 4)
return AVERROR_INVALIDDATA;
st->codec->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) {
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->codec->channel_layout = dsd_loudspeaker_config[config];
if (!st->codec->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 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->codec->channels = 1;
st->codec->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->codec->codec_tag = avio_rl32(pb);
if (st->codec->codec_tag == ID_ANIM) {
avio_skip(pb, 8);
st->codec->codec_tag = avio_rl32(pb);
}
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->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_MHDR:
st->codec->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->codec->sample_rate = num / den;
st->codec->channels = avio_rb16(pb);
iff->maud_compression = avio_rb16(pb);
if (st->codec->channels == 1)
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
else if (st->codec->channels == 2)
st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
break;
case ID_ABIT:
case ID_BODY:
case ID_DBOD:
case ID_DSD:
case ID_MDAT:
iff->body_pos = avio_tell(pb);
iff->body_end = iff->body_pos + data_size;
iff->body_size = data_size;
break;
case ID_CHAN:
if (data_size < 4)
return AVERROR_INVALIDDATA;
if (avio_rb32(pb) < 6) {
st->codec->channels = 1;
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
} else {
st->codec->channels = 2;
st->codec->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->codec->extradata_size = data_size + IFF_EXTRA_VIDEO_SIZE;
st->codec->extradata = av_malloc(data_size + IFF_EXTRA_VIDEO_SIZE + AV_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:
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_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->codec->pix_fmt = AV_PIX_FMT_RGB24;
else if (fmt_size == sizeof(deep_rgba) && !memcmp(fmt, deep_rgba, sizeof(deep_rgba)))
st->codec->pix_fmt = AV_PIX_FMT_RGBA;
else if (fmt_size == sizeof(deep_bgra) && !memcmp(fmt, deep_bgra, sizeof(deep_bgra)))
st->codec->pix_fmt = AV_PIX_FMT_BGRA;
else if (fmt_size == sizeof(deep_argb) && !memcmp(fmt, deep_argb, sizeof(deep_argb)))
st->codec->pix_fmt = AV_PIX_FMT_ARGB;
else if (fmt_size == sizeof(deep_abgr) && !memcmp(fmt, deep_abgr, sizeof(deep_abgr)))
st->codec->pix_fmt = AV_PIX_FMT_ABGR;
else {
avpriv_request_sample(s, "color format %.16s", fmt);
return AVERROR_PATCHWELCOME;
}
break;
case ID_DGBL:
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);
iff->bitmap_compression = avio_rb16(pb);
st->sample_aspect_ratio.num = avio_r8(pb);
st->sample_aspect_ratio.den = avio_r8(pb);
st->codec->bits_per_coded_sample = 24;
break;
case ID_DLOC:
if (data_size < 4)
return AVERROR_INVALIDDATA;
st->codec->width = avio_rb16(pb);
st->codec->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->codec->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));
}
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);
if (st->codec->codec_tag == ID_16SV)
st->codec->codec_id = AV_CODEC_ID_PCM_S16BE_PLANAR;
else if (st->codec->codec_tag == ID_MAUD) {
if (iff->maud_bits == 8 && !iff->maud_compression) {
st->codec->codec_id = AV_CODEC_ID_PCM_U8;
} else if (iff->maud_bits == 16 && !iff->maud_compression) {
st->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
} else if (iff->maud_bits == 8 && iff->maud_compression == 2) {
st->codec->codec_id = AV_CODEC_ID_PCM_ALAW;
} else if (iff->maud_bits == 8 && iff->maud_compression == 3) {
st->codec->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->codec->codec_tag != ID_DSD) {
switch (iff->svx8_compression) {
case COMP_NONE:
st->codec->codec_id = AV_CODEC_ID_PCM_S8_PLANAR;
break;
case COMP_FIB:
st->codec->codec_id = AV_CODEC_ID_8SVX_FIB;
break;
case COMP_EXP:
st->codec->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->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
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 + AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
}
av_assert0(st->codec->extradata_size >= IFF_EXTRA_VIDEO_SIZE);
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);
bytestream_put_buffer(&buf, iff->tvdc, sizeof(iff->tvdc));
st->codec->codec_id = AV_CODEC_ID_IFF_ILBM;
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;
int64_t pos = avio_tell(pb);
if (pos >= iff->body_end)
return AVERROR_EOF;
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
if (st->codec->codec_tag == ID_DSD || st->codec->codec_tag == ID_MAUD) {
ret = av_get_packet(pb, pkt, FFMIN(iff->body_end - pos, 1024 * st->codec->block_align));
} else {
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);
if (ret<0) {
av_free_packet(pkt);
} else if (ret < iff->body_size)
av_shrink_packet(pkt, ret + 2);
} else {
av_assert0(0);
}
if (pos == iff->body_pos)
pkt->flags |= AV_PKT_FLAG_KEY;
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,
};
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