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avidec.c
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avidec.c
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/*
* AVI demuxer
* Copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config_components.h"
#include <inttypes.h>
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "avformat.h"
#include "avi.h"
#include "demux.h"
#include "dv.h"
#include "internal.h"
#include "isom.h"
#include "riff.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/exif.h"
#include "libavcodec/startcode.h"
typedef struct AVIStream {
int64_t frame_offset; /* current frame (video) or byte (audio) counter
* (used to compute the pts) */
int remaining;
int packet_size;
uint32_t handler;
uint32_t scale;
uint32_t rate;
int sample_size; /* size of one sample (or packet)
* (in the rate/scale sense) in bytes */
int64_t cum_len; /* temporary storage (used during seek) */
int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
int prefix_count;
uint32_t pal[256];
int has_pal;
int dshow_block_align; /* block align variable used to emulate bugs in
* the MS dshow demuxer */
AVFormatContext *sub_ctx;
AVPacket *sub_pkt;
AVBufferRef *sub_buffer;
int64_t seek_pos;
} AVIStream;
typedef struct AVIContext {
const AVClass *class;
int64_t riff_end;
int64_t movi_end;
int64_t fsize;
int64_t io_fsize;
int64_t movi_list;
int64_t last_pkt_pos;
int index_loaded;
int is_odml;
int non_interleaved;
int stream_index;
DVDemuxContext *dv_demux;
int odml_depth;
int64_t odml_read;
int64_t odml_max_pos;
int use_odml;
#define MAX_ODML_DEPTH 1000
int64_t dts_max;
} AVIContext;
static const AVOption options[] = {
{ "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM},
{ NULL },
};
static const AVClass demuxer_class = {
.class_name = "avi",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
.category = AV_CLASS_CATEGORY_DEMUXER,
};
static const char avi_headers[][8] = {
{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
{ 0 }
};
static const AVMetadataConv avi_metadata_conv[] = {
{ "strn", "title" },
{ "isbj", "subject" },
{ "inam", "title" },
{ "iart", "artist" },
{ "icop", "copyright" },
{ "icmt", "comment" },
{ "ignr", "genre" },
{ "iprd", "product" },
{ "isft", "software" },
{ 0 },
};
static int avi_load_index(AVFormatContext *s);
static int guess_ni_flag(AVFormatContext *s);
#define print_tag(s, str, tag, size) \
av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \
avio_tell(pb), str, av_fourcc2str(tag), size) \
static inline int get_duration(AVIStream *ast, int len)
{
if (ast->sample_size)
return len;
else if (ast->dshow_block_align)
return (len + (int64_t)ast->dshow_block_align - 1) / ast->dshow_block_align;
else
return 1;
}
static int get_riff(AVFormatContext *s, AVIOContext *pb)
{
AVIContext *avi = s->priv_data;
char header[8] = {0};
int i;
/* check RIFF header */
avio_read(pb, header, 4);
avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
avi->riff_end += avio_tell(pb); /* RIFF chunk end */
avio_read(pb, header + 4, 4);
for (i = 0; avi_headers[i][0]; i++)
if (!memcmp(header, avi_headers[i], 8))
break;
if (!avi_headers[i][0])
return AVERROR_INVALIDDATA;
if (header[7] == 0x19)
av_log(s, AV_LOG_INFO,
"This file has been generated by a totally broken muxer.\n");
return 0;
}
static int read_odml_index(AVFormatContext *s, int64_t frame_num)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int longs_per_entry = avio_rl16(pb);
int index_sub_type = avio_r8(pb);
int index_type = avio_r8(pb);
int entries_in_use = avio_rl32(pb);
int chunk_id = avio_rl32(pb);
int64_t base = avio_rl64(pb);
int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
((chunk_id >> 8 & 0xFF) - '0');
AVStream *st;
AVIStream *ast;
int i;
int64_t last_pos = -1;
int64_t filesize = avi->fsize;
av_log(s, AV_LOG_TRACE,
"longs_per_entry:%d index_type:%d entries_in_use:%d "
"chunk_id:%X base:%16"PRIX64" frame_num:%"PRId64"\n",
longs_per_entry,
index_type,
entries_in_use,
chunk_id,
base,
frame_num);
if (stream_id >= s->nb_streams || stream_id < 0)
return AVERROR_INVALIDDATA;
st = s->streams[stream_id];
ast = st->priv_data;
if (index_sub_type || entries_in_use < 0)
return AVERROR_INVALIDDATA;
avio_rl32(pb);
if (index_type && longs_per_entry != 2)
return AVERROR_INVALIDDATA;
if (index_type > 1)
return AVERROR_INVALIDDATA;
if (filesize > 0 && base >= filesize) {
av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
if (base >> 32 == (base & 0xFFFFFFFF) &&
(base & 0xFFFFFFFF) < filesize &&
filesize <= 0xFFFFFFFF)
base &= 0xFFFFFFFF;
else
return AVERROR_INVALIDDATA;
}
for (i = 0; i < entries_in_use; i++) {
avi->odml_max_pos = FFMAX(avi->odml_max_pos, avio_tell(pb));
// If we read more than there are bytes then we must have been reading something twice
if (avi->odml_read > avi->odml_max_pos)
return AVERROR_INVALIDDATA;
if (index_type) {
int64_t pos = avio_rl32(pb) + base - 8;
int len = avio_rl32(pb);
int key = len >= 0;
len &= 0x7FFFFFFF;
avi->odml_read += 8;
av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
if (last_pos == pos || pos == base - 8)
avi->non_interleaved = 1;
if (last_pos != pos && len)
av_add_index_entry(st, pos, ast->cum_len, len, 0,
key ? AVINDEX_KEYFRAME : 0);
ast->cum_len += get_duration(ast, len);
last_pos = pos;
} else {
int64_t offset, pos;
int duration;
int ret;
avi->odml_read += 16;
offset = avio_rl64(pb);
avio_rl32(pb); /* size */
duration = avio_rl32(pb);
if (avio_feof(pb) || offset > INT64_MAX - 8)
return AVERROR_INVALIDDATA;
pos = avio_tell(pb);
if (avi->odml_depth > MAX_ODML_DEPTH) {
av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
return AVERROR_INVALIDDATA;
}
if (avio_seek(pb, offset + 8, SEEK_SET) < 0)
return -1;
avi->odml_depth++;
ret = read_odml_index(s, frame_num);
avi->odml_depth--;
frame_num += duration;
if (avio_seek(pb, pos, SEEK_SET) < 0) {
av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index\n");
return -1;
}
if (ret < 0)
return ret;
}
}
avi->index_loaded = 2;
return 0;
}
static void clean_index(AVFormatContext *s)
{
int i;
int64_t j;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
FFStream *const sti = ffstream(st);
AVIStream *ast = st->priv_data;
int n = sti->nb_index_entries;
int max = ast->sample_size;
int64_t pos, size, ts;
if (n != 1 || ast->sample_size == 0)
continue;
while (max < 1024)
max += max;
pos = sti->index_entries[0].pos;
size = sti->index_entries[0].size;
ts = sti->index_entries[0].timestamp;
for (j = 0; j < size; j += max)
av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
AVINDEX_KEYFRAME);
}
}
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
uint32_t size)
{
AVIOContext *pb = s->pb;
char key[5] = { 0 };
char *value;
size += (size & 1);
if (size == UINT_MAX)
return AVERROR(EINVAL);
value = av_malloc(size + 1);
if (!value)
return AVERROR(ENOMEM);
if (avio_read(pb, value, size) != size) {
av_freep(&value);
return AVERROR_INVALIDDATA;
}
value[size] = 0;
AV_WL32(key, tag);
return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
AV_DICT_DONT_STRDUP_VAL);
}
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
{
char month[4], time[9], buffer[64];
int i, day, year;
/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
month, &day, time, &year) == 4) {
for (i = 0; i < 12; i++)
if (!av_strcasecmp(month, months[i])) {
snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
year, i + 1, day, time);
av_dict_set(metadata, "creation_time", buffer, 0);
}
} else if (date[4] == '/' && date[7] == '/') {
date[4] = date[7] = '-';
av_dict_set(metadata, "creation_time", date, 0);
}
}
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
{
while (avio_tell(s->pb) < end && !avio_feof(s->pb)) {
uint32_t tag = avio_rl32(s->pb);
uint32_t size = avio_rl32(s->pb);
switch (tag) {
case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
{
uint64_t tag_end = avio_tell(s->pb) + size;
while (avio_tell(s->pb) < tag_end && !avio_feof(s->pb)) {
uint16_t tag = avio_rl16(s->pb);
uint16_t size = avio_rl16(s->pb);
const char *name = NULL;
char buffer[64] = { 0 };
uint64_t remaining = tag_end - avio_tell(s->pb);
size = FFMIN(size, remaining);
size -= avio_read(s->pb, buffer,
FFMIN(size, sizeof(buffer) - 1));
switch (tag) {
case 0x03:
name = "maker";
break;
case 0x04:
name = "model";
break;
case 0x13:
name = "creation_time";
if (buffer[4] == ':' && buffer[7] == ':')
buffer[4] = buffer[7] = '-';
break;
}
if (name)
av_dict_set(&s->metadata, name, buffer, 0);
avio_skip(s->pb, size);
}
break;
}
default:
avio_skip(s->pb, size);
break;
}
}
}
static int avi_extract_stream_metadata(AVFormatContext *s, AVStream *st)
{
GetByteContext gb;
uint8_t *data = st->codecpar->extradata;
int data_size = st->codecpar->extradata_size;
int tag, offset;
if (!data || data_size < 8) {
return AVERROR_INVALIDDATA;
}
bytestream2_init(&gb, data, data_size);
tag = bytestream2_get_le32(&gb);
switch (tag) {
case MKTAG('A', 'V', 'I', 'F'):
// skip 4 byte padding
bytestream2_skip(&gb, 4);
offset = bytestream2_tell(&gb);
// decode EXIF tags from IFD, AVI is always little-endian
return avpriv_exif_decode_ifd(s, data + offset, data_size - offset,
1, 0, &st->metadata);
break;
case MKTAG('C', 'A', 'S', 'I'):
avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag);
break;
case MKTAG('Z', 'o', 'r', 'a'):
avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag);
break;
default:
break;
}
return 0;
}
static int calculate_bitrate(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
int i, j;
int64_t lensum = 0;
int64_t maxpos = 0;
for (i = 0; i<s->nb_streams; i++) {
int64_t len = 0;
FFStream *const sti = ffstream(s->streams[i]);
if (!sti->nb_index_entries)
continue;
for (j = 0; j < sti->nb_index_entries; j++)
len += sti->index_entries[j].size;
maxpos = FFMAX(maxpos, sti->index_entries[j-1].pos);
lensum += len;
}
if (maxpos < av_rescale(avi->io_fsize, 9, 10)) // index does not cover the whole file
return 0;
if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch
return 0;
for (i = 0; i<s->nb_streams; i++) {
int64_t len = 0;
AVStream *st = s->streams[i];
FFStream *const sti = ffstream(st);
int64_t duration;
int64_t bitrate;
for (j = 0; j < sti->nb_index_entries; j++)
len += sti->index_entries[j].size;
if (sti->nb_index_entries < 2 || st->codecpar->bit_rate > 0)
continue;
duration = sti->index_entries[j-1].timestamp - sti->index_entries[0].timestamp;
bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num);
if (bitrate > 0) {
st->codecpar->bit_rate = bitrate;
}
}
return 1;
}
static int avi_read_header(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
unsigned int tag, tag1, handler;
int codec_type, stream_index, frame_period;
unsigned int size;
int i;
AVStream *st;
AVIStream *ast = NULL;
int avih_width = 0, avih_height = 0;
int amv_file_format = 0;
uint64_t list_end = 0;
int64_t pos;
int ret;
AVDictionaryEntry *dict_entry;
avi->stream_index = -1;
ret = get_riff(s, pb);
if (ret < 0)
return ret;
av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml);
avi->io_fsize = avi->fsize = avio_size(pb);
if (avi->fsize <= 0 || avi->fsize < avi->riff_end)
avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
/* first list tag */
stream_index = -1;
codec_type = -1;
frame_period = 0;
for (;;) {
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
tag = avio_rl32(pb);
size = avio_rl32(pb);
print_tag(s, "tag", tag, size);
switch (tag) {
case MKTAG('L', 'I', 'S', 'T'):
list_end = avio_tell(pb) + size;
/* Ignored, except at start of video packets. */
tag1 = avio_rl32(pb);
print_tag(s, "list", tag1, 0);
if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
avi->movi_list = avio_tell(pb) - 4;
if (size)
avi->movi_end = avi->movi_list + size + (size & 1);
else
avi->movi_end = avi->fsize;
av_log(s, AV_LOG_TRACE, "movi end=%"PRIx64"\n", avi->movi_end);
goto end_of_header;
} else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
ff_read_riff_info(s, size - 4);
else if (tag1 == MKTAG('n', 'c', 'd', 't'))
avi_read_nikon(s, list_end);
break;
case MKTAG('I', 'D', 'I', 'T'):
{
unsigned char date[64] = { 0 };
size += (size & 1);
size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
avio_skip(pb, size);
avi_metadata_creation_time(&s->metadata, date);
break;
}
case MKTAG('d', 'm', 'l', 'h'):
avi->is_odml = 1;
avio_skip(pb, size + (size & 1));
break;
case MKTAG('a', 'm', 'v', 'h'):
amv_file_format = 1;
case MKTAG('a', 'v', 'i', 'h'):
/* AVI header */
/* using frame_period is bad idea */
frame_period = avio_rl32(pb);
avio_rl32(pb); /* max. bytes per second */
avio_rl32(pb);
avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
avio_skip(pb, 2 * 4);
avio_rl32(pb);
avio_rl32(pb);
avih_width = avio_rl32(pb);
avih_height = avio_rl32(pb);
avio_skip(pb, size - 10 * 4);
break;
case MKTAG('s', 't', 'r', 'h'):
/* stream header */
tag1 = avio_rl32(pb);
handler = avio_rl32(pb); /* codec tag */
if (tag1 == MKTAG('p', 'a', 'd', 's')) {
avio_skip(pb, size - 8);
break;
} else {
stream_index++;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
st->id = stream_index;
ast = av_mallocz(sizeof(AVIStream));
if (!ast)
return AVERROR(ENOMEM);
st->priv_data = ast;
}
if (amv_file_format)
tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
: MKTAG('v', 'i', 'd', 's');
print_tag(s, "strh", tag1, -1);
if (tag1 == MKTAG('i', 'a', 'v', 's') ||
tag1 == MKTAG('i', 'v', 'a', 's')) {
int64_t dv_dur;
/* After some consideration -- I don't think we
* have to support anything but DV in type1 AVIs. */
if (s->nb_streams != 1)
return AVERROR_INVALIDDATA;
if (handler != MKTAG('d', 'v', 's', 'd') &&
handler != MKTAG('d', 'v', 'h', 'd') &&
handler != MKTAG('d', 'v', 's', 'l'))
return AVERROR_INVALIDDATA;
if (!CONFIG_DV_DEMUXER)
return AVERROR_DEMUXER_NOT_FOUND;
ast = s->streams[0]->priv_data;
st->priv_data = NULL;
ff_remove_stream(s, st);
avi->dv_demux = avpriv_dv_init_demux(s);
if (!avi->dv_demux) {
av_free(ast);
return AVERROR(ENOMEM);
}
s->streams[0]->priv_data = ast;
avio_skip(pb, 3 * 4);
ast->scale = avio_rl32(pb);
ast->rate = avio_rl32(pb);
avio_skip(pb, 4); /* start time */
dv_dur = avio_rl32(pb);
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
dv_dur *= AV_TIME_BASE;
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
}
/* else, leave duration alone; timing estimation in utils.c
* will make a guess based on bitrate. */
stream_index = s->nb_streams - 1;
avio_skip(pb, size - 9 * 4);
break;
}
av_assert0(stream_index < s->nb_streams);
ast->handler = handler;
avio_rl32(pb); /* flags */
avio_rl16(pb); /* priority */
avio_rl16(pb); /* language */
avio_rl32(pb); /* initial frame */
ast->scale = avio_rl32(pb);
ast->rate = avio_rl32(pb);
if (!(ast->scale && ast->rate)) {
av_log(s, AV_LOG_WARNING,
"scale/rate is %"PRIu32"/%"PRIu32" which is invalid. "
"(This file has been generated by broken software.)\n",
ast->scale,
ast->rate);
if (frame_period) {
ast->rate = 1000000;
ast->scale = frame_period;
} else {
ast->rate = 25;
ast->scale = 1;
}
}
avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
ast->cum_len = avio_rl32(pb); /* start */
st->nb_frames = avio_rl32(pb);
st->start_time = 0;
avio_rl32(pb); /* buffer size */
avio_rl32(pb); /* quality */
if (ast->cum_len > 3600LL * ast->rate / ast->scale) {
av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n");
ast->cum_len = 0;
}
ast->sample_size = avio_rl32(pb);
ast->cum_len *= FFMAX(1, ast->sample_size);
av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n",
ast->rate, ast->scale, ast->sample_size);
switch (tag1) {
case MKTAG('v', 'i', 'd', 's'):
codec_type = AVMEDIA_TYPE_VIDEO;
ast->sample_size = 0;
st->avg_frame_rate = av_inv_q(st->time_base);
break;
case MKTAG('a', 'u', 'd', 's'):
codec_type = AVMEDIA_TYPE_AUDIO;
break;
case MKTAG('t', 'x', 't', 's'):
codec_type = AVMEDIA_TYPE_SUBTITLE;
break;
case MKTAG('d', 'a', 't', 's'):
codec_type = AVMEDIA_TYPE_DATA;
break;
default:
av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1);
}
if (ast->sample_size < 0) {
if (s->error_recognition & AV_EF_EXPLODE) {
av_log(s, AV_LOG_ERROR,
"Invalid sample_size %d at stream %d\n",
ast->sample_size,
stream_index);
return AVERROR_INVALIDDATA;
}
av_log(s, AV_LOG_WARNING,
"Invalid sample_size %d at stream %d "
"setting it to 0\n",
ast->sample_size,
stream_index);
ast->sample_size = 0;
}
if (ast->sample_size == 0) {
st->duration = st->nb_frames;
if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) {
av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n");
st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end);
}
}
ast->frame_offset = ast->cum_len;
avio_skip(pb, size - 12 * 4);
break;
case MKTAG('s', 't', 'r', 'f'):
/* stream header */
if (!size && (codec_type == AVMEDIA_TYPE_AUDIO ||
codec_type == AVMEDIA_TYPE_VIDEO))
break;
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
avio_skip(pb, size);
} else {
uint64_t cur_pos = avio_tell(pb);
FFStream *sti;
unsigned esize;
if (cur_pos < list_end)
size = FFMIN(size, list_end - cur_pos);
st = s->streams[stream_index];
sti = ffstream(st);
if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) {
avio_skip(pb, size);
break;
}
switch (codec_type) {
case AVMEDIA_TYPE_VIDEO:
if (amv_file_format) {
st->codecpar->width = avih_width;
st->codecpar->height = avih_height;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_AMV;
avio_skip(pb, size);
break;
}
tag1 = ff_get_bmp_header(pb, st, &esize);
if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
tag1 == MKTAG('D', 'X', 'S', 'A')) {
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_tag = tag1;
st->codecpar->codec_id = AV_CODEC_ID_XSUB;
break;
}
if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) {
if (esize == size-1 && (esize&1)) {
st->codecpar->extradata_size = esize - 10 * 4;
} else
st->codecpar->extradata_size = size - 10 * 4;
if (st->codecpar->extradata) {
av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n");
}
ret = ff_get_extradata(s, st->codecpar, pb,
st->codecpar->extradata_size);
if (ret < 0)
return ret;
}
// FIXME: check if the encoder really did this correctly
if (st->codecpar->extradata_size & 1)
avio_r8(pb);
/* Extract palette from extradata if bpp <= 8.
* This code assumes that extradata contains only palette.
* This is true for all paletted codecs implemented in
* FFmpeg. */
if (st->codecpar->extradata_size &&
(st->codecpar->bits_per_coded_sample <= 8)) {
int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2;
const uint8_t *pal_src;
pal_size = FFMIN(pal_size, st->codecpar->extradata_size);
pal_src = st->codecpar->extradata +
st->codecpar->extradata_size - pal_size;
/* Exclude the "BottomUp" field from the palette */
if (pal_src - st->codecpar->extradata >= 9 &&
!memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9))
pal_src -= 9;
for (i = 0; i < pal_size / 4; i++)
ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i);
ast->has_pal = 1;
}
print_tag(s, "video", tag1, 0);
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_tag = tag1;
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
tag1);
/* If codec is not found yet, try with the mov tags. */
if (!st->codecpar->codec_id) {
st->codecpar->codec_id =
ff_codec_get_id(ff_codec_movvideo_tags, tag1);
if (st->codecpar->codec_id)
av_log(s, AV_LOG_WARNING,
"mov tag found in avi (fourcc %s)\n",
av_fourcc2str(tag1));
}
if (!st->codecpar->codec_id)
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
/* This is needed to get the pict type which is necessary
* for generating correct pts. */
sti->need_parsing = AVSTREAM_PARSE_HEADERS;
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 &&
ast->handler == MKTAG('X', 'V', 'I', 'D'))
st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D');
if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H'))
sti->need_parsing = AVSTREAM_PARSE_FULL;
if (st->codecpar->codec_id == AV_CODEC_ID_RV40)
sti->need_parsing = AVSTREAM_PARSE_NONE;
if (st->codecpar->codec_id == AV_CODEC_ID_HEVC &&
st->codecpar->codec_tag == MKTAG('H', '2', '6', '5'))
sti->need_parsing = AVSTREAM_PARSE_FULL;
if (st->codecpar->codec_id == AV_CODEC_ID_AVRN &&
st->codecpar->codec_tag == MKTAG('A', 'V', 'R', 'n') &&
(st->codecpar->extradata_size < 31 ||
memcmp(&st->codecpar->extradata[28], "1:1", 3)))
st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 &&
st->codecpar->extradata_size < 1U << 30) {
st->codecpar->extradata_size += 9;
if ((ret = av_reallocp(&st->codecpar->extradata,
st->codecpar->extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE)) < 0) {
st->codecpar->extradata_size = 0;
return ret;
} else
memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9,
"BottomUp", 9);
}
if (st->codecpar->height == INT_MIN)
return AVERROR_INVALIDDATA;
st->codecpar->height = FFABS(st->codecpar->height);
// avio_skip(pb, size - 5 * 4);
break;
case AVMEDIA_TYPE_AUDIO:
ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
if (ret < 0)
return ret;
ast->dshow_block_align = st->codecpar->block_align;
if (ast->sample_size && st->codecpar->block_align &&
ast->sample_size != st->codecpar->block_align) {
av_log(s,
AV_LOG_WARNING,
"sample size (%d) != block align (%d)\n",
ast->sample_size,
st->codecpar->block_align);
ast->sample_size = st->codecpar->block_align;
}
/* 2-aligned
* (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
if (size & 1)
avio_skip(pb, 1);
/* Force parsing as several audio frames can be in
* one packet and timestamps refer to packet start. */
sti->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
/* ADTS header is in extradata, AAC without header must be
* stored as exact frames. Parser not needed and it will
* fail. */
if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
st->codecpar->extradata_size)
sti->need_parsing = AVSTREAM_PARSE_NONE;
// The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS
if (st->codecpar->codec_id == AV_CODEC_ID_FLAC)
sti->need_parsing = AVSTREAM_PARSE_NONE;
/* AVI files with Xan DPCM audio (wrongly) declare PCM
* audio in the header but have Axan as stream_code_tag. */
if (ast->handler == AV_RL32("Axan")) {
st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM;
st->codecpar->codec_tag = 0;
ast->dshow_block_align = 0;
}
if (amv_file_format) {
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
ast->dshow_block_align = 0;
}
if ((st->codecpar->codec_id == AV_CODEC_ID_AAC ||
st->codecpar->codec_id == AV_CODEC_ID_FLAC ||
st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) {
av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align);
ast->dshow_block_align = 0;
}
if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 ||
st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 ||
st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) {
av_log(s, AV_LOG_DEBUG, "overriding sample_size\n");
ast->sample_size = 0;
}
break;
case AVMEDIA_TYPE_SUBTITLE:
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
sti->request_probe = 1;
avio_skip(pb, size);
break;
default:
st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
st->codecpar->codec_id = AV_CODEC_ID_NONE;
st->codecpar->codec_tag = 0;
avio_skip(pb, size);
break;
}
}
break;
case MKTAG('s', 't', 'r', 'd'):
if (stream_index >= (unsigned)s->nb_streams
|| s->streams[stream_index]->codecpar->extradata_size
|| s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) {
avio_skip(pb, size);
} else {
uint64_t cur_pos = avio_tell(pb);
if (cur_pos < list_end)
size = FFMIN(size, list_end - cur_pos);
st = s->streams[stream_index];
if (size<(1<<30)) {
if (st->codecpar->extradata) {
av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n");
}
if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)
return ret;
}
if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly
avio_r8(pb);
ret = avi_extract_stream_metadata(s, st);
if (ret < 0) {
av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n");
}
}
break;
case MKTAG('i', 'n', 'd', 'x'):
pos = avio_tell(pb);
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) &&
avi->use_odml &&
read_odml_index(s, 0) < 0 &&
(s->error_recognition & AV_EF_EXPLODE))
return AVERROR_INVALIDDATA;
avio_seek(pb, pos + size, SEEK_SET);
break;
case MKTAG('v', 'p', 'r', 'p'):
if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
AVRational active, active_aspect;
st = s->streams[stream_index];
avio_rl32(pb);
avio_rl32(pb);
avio_rl32(pb);
avio_rl32(pb);
avio_rl32(pb);
active_aspect.den = avio_rl16(pb);