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ffmpeg/libavformat/avidec.c
Michael Niedermayer f3e823c2aa
avformat/avidec: Prevent entity expansion attacks 
Fixes: Timeout
Fixes no testcase, this is the same idea as similar attacks against XML parsers

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-08-28 22:06:31 +02:00

2015 lines
70 KiB
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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);
active_aspect.num = avio_rl16(pb);
active.num = avio_rl32(pb);
active.den = avio_rl32(pb);
avio_rl32(pb); // nbFieldsPerFrame
if (active_aspect.num && active_aspect.den &&
active.num && active.den) {
st->sample_aspect_ratio = av_div_q(active_aspect, active);
av_log(s, AV_LOG_TRACE, "vprp %d/%d %d/%d\n",
active_aspect.num, active_aspect.den,
active.num, active.den);
}
size -= 9 * 4;
}
avio_skip(pb, size);
break;
case MKTAG('s', 't', 'r', 'n'):
case MKTAG('i', 's', 'b', 'j'):
case MKTAG('i', 'n', 'a', 'm'):
case MKTAG('i', 'a', 'r', 't'):
case MKTAG('i', 'c', 'o', 'p'):
case MKTAG('i', 'c', 'm', 't'):
case MKTAG('i', 'g', 'n', 'r'):
case MKTAG('i', 'p', 'o', 'd'):
case MKTAG('i', 's', 'o', 'f'):
if (s->nb_streams) {
ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
if (ret < 0)
return ret;
break;
}
default:
if (size > 1000000) {
av_log(s, AV_LOG_ERROR,
"Something went wrong during header parsing, "
"tag %s has size %u, "
"I will ignore it and try to continue anyway.\n",
av_fourcc2str(tag), size);
if (s->error_recognition & AV_EF_EXPLODE)
return AVERROR_INVALIDDATA;
avi->movi_list = avio_tell(pb) - 4;
avi->movi_end = avi->fsize;
goto end_of_header;
}
/* Do not fail for very large idx1 tags */
case MKTAG('i', 'd', 'x', '1'):
/* skip tag */
size += (size & 1);
avio_skip(pb, size);
break;
}
}
end_of_header:
/* check stream number */
if (stream_index != s->nb_streams - 1)
return AVERROR_INVALIDDATA;
if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL))
avi_load_index(s);
calculate_bitrate(s);
avi->index_loaded |= 1;
if ((ret = guess_ni_flag(s)) < 0)
return ret;
avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS);
dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0);
if (dict_entry && !strcmp(dict_entry->value, "PotEncoder"))
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO
|| st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO)
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
if (ffstream(st)->nb_index_entries)
break;
}
// DV-in-AVI cannot be non-interleaved, if set this must be
// a mis-detection.
if (avi->dv_demux)
avi->non_interleaved = 0;
if (i == s->nb_streams && avi->non_interleaved) {
av_log(s, AV_LOG_WARNING,
"Non-interleaved AVI without index, switching to interleaved\n");
avi->non_interleaved = 0;
}
if (avi->non_interleaved) {
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
clean_index(s);
}
ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
return 0;
}
static int read_gab2_sub(AVFormatContext *s, AVStream *st, AVPacket *pkt)
{
if (pkt->size >= 7 &&
pkt->size < INT_MAX - AVPROBE_PADDING_SIZE &&
!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
uint8_t desc[256];
int score = AVPROBE_SCORE_EXTENSION, ret;
AVIStream *ast = st->priv_data;
const AVInputFormat *sub_demuxer;
AVRational time_base;
int size;
AVProbeData pd;
unsigned int desc_len;
AVIOContext *pb = avio_alloc_context(pkt->data + 7,
pkt->size - 7,
0, NULL, NULL, NULL, NULL);
if (!pb)
goto error;
desc_len = avio_rl32(pb);
if (desc_len > pb->buf_end - pb->buf_ptr)
goto error;
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
avio_skip(pb, desc_len - ret);
if (*desc)
av_dict_set(&st->metadata, "title", desc, 0);
avio_rl16(pb); /* flags? */
avio_rl32(pb); /* data size */
size = pb->buf_end - pb->buf_ptr;
pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE),
.buf_size = size };
if (!pd.buf)
goto error;
memcpy(pd.buf, pb->buf_ptr, size);
sub_demuxer = av_probe_input_format2(&pd, 1, &score);
av_freep(&pd.buf);
if (!sub_demuxer)
goto error;
if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass"))
goto error;
if (!(ast->sub_pkt = av_packet_alloc()))
goto error;
if (!(ast->sub_ctx = avformat_alloc_context()))
goto error;
ast->sub_ctx->pb = pb;
if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0)
goto error;
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
if (ast->sub_ctx->nb_streams != 1)
goto error;
ff_read_packet(ast->sub_ctx, ast->sub_pkt);
avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar);
time_base = ast->sub_ctx->streams[0]->time_base;
avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
}
ast->sub_buffer = pkt->buf;
pkt->buf = NULL;
av_packet_unref(pkt);
return 1;
error:
av_packet_free(&ast->sub_pkt);
av_freep(&ast->sub_ctx);
avio_context_free(&pb);
}
return 0;
}
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
AVPacket *pkt)
{
AVIStream *ast, *next_ast = next_st->priv_data;
int64_t ts, next_ts, ts_min = INT64_MAX;
AVStream *st, *sub_st = NULL;
int i;
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
AV_TIME_BASE_Q);
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
ast = st->priv_data;
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt && ast->sub_pkt->data) {
ts = av_rescale_q(ast->sub_pkt->dts, st->time_base, AV_TIME_BASE_Q);
if (ts <= next_ts && ts < ts_min) {
ts_min = ts;
sub_st = st;
}
}
}
if (sub_st) {
ast = sub_st->priv_data;
av_packet_move_ref(pkt, ast->sub_pkt);
pkt->stream_index = sub_st->index;
if (ff_read_packet(ast->sub_ctx, ast->sub_pkt) < 0)
ast->sub_pkt->data = NULL;
}
return sub_st;
}
static int get_stream_idx(const unsigned *d)
{
if (d[0] >= '0' && d[0] <= '9' &&
d[1] >= '0' && d[1] <= '9') {
return (d[0] - '0') * 10 + (d[1] - '0');
} else {
return 100; // invalid stream ID
}
}
/**
*
* @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet
*/
static int avi_sync(AVFormatContext *s, int exit_early)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int n;
unsigned int d[8];
unsigned int size;
int64_t i, sync;
start_sync:
memset(d, -1, sizeof(d));
for (i = sync = avio_tell(pb); !avio_feof(pb); i++) {
int j;
for (j = 0; j < 7; j++)
d[j] = d[j + 1];
d[7] = avio_r8(pb);
size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
n = get_stream_idx(d + 2);
ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
if (i*(avi->io_fsize>0) + (uint64_t)size > avi->fsize || d[0] > 127)
continue;
// parse ix##
if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
// parse JUNK
(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1') ||
(d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) {
avio_skip(pb, size);
goto start_sync;
}
// parse stray LIST
if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
avio_skip(pb, 4);
goto start_sync;
}
n = get_stream_idx(d);
if (!((i - avi->last_pkt_pos) & 1) &&
get_stream_idx(d + 1) < s->nb_streams)
continue;
// detect ##ix chunk and skip
if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
avio_skip(pb, size);
goto start_sync;
}
if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) {
avio_skip(pb, 16 * 3 + 8);
goto start_sync;
}
if (avi->dv_demux && n != 0)
continue;
// parse ##dc/##wb
if (n < s->nb_streams) {
AVStream *st;
AVIStream *ast;
st = s->streams[n];
ast = st->priv_data;
if (!ast) {
av_log(s, AV_LOG_WARNING, "Skipping foreign stream %d packet\n", n);
continue;
}
if (s->nb_streams >= 2) {
AVStream *st1 = s->streams[1];
AVIStream *ast1 = st1->priv_data;
// workaround for broken small-file-bug402.avi
if (ast1 && d[2] == 'w' && d[3] == 'b'
&& n == 0
&& st ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
&& st1->codecpar->codec_type == AVMEDIA_TYPE_AUDIO
&& ast->prefix == 'd'*256+'c'
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
) {
n = 1;
st = st1;
ast = ast1;
av_log(s, AV_LOG_WARNING,
"Invalid stream + prefix combination, assuming audio.\n");
}
}
if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
int k = avio_r8(pb);
int last = (k + avio_r8(pb) - 1) & 0xFF;
avio_rl16(pb); // flags
// b + (g << 8) + (r << 16);
for (; k <= last; k++)
ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8;
ast->has_pal = 1;
goto start_sync;
} else if (((ast->prefix_count < 5 || sync + 9 > i) &&
d[2] < 128 && d[3] < 128) ||
d[2] * 256 + d[3] == ast->prefix /* ||
(d[2] == 'd' && d[3] == 'c') ||
(d[2] == 'w' && d[3] == 'b') */) {
if (exit_early)
return 0;
if (d[2] * 256 + d[3] == ast->prefix)
ast->prefix_count++;
else {
ast->prefix = d[2] * 256 + d[3];
ast->prefix_count = 0;
}
if (!avi->dv_demux &&
((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
// FIXME: needs a little reordering
(st->discard >= AVDISCARD_NONKEY &&
!(pkt->flags & AV_PKT_FLAG_KEY)) */
|| st->discard >= AVDISCARD_ALL)) {
ast->frame_offset += get_duration(ast, size);
avio_skip(pb, size);
goto start_sync;
}
avi->stream_index = n;
ast->packet_size = size + 8;
ast->remaining = size;
if (size) {
FFStream *const sti = ffstream(st);
uint64_t pos = avio_tell(pb) - 8;
if (!sti->index_entries || !sti->nb_index_entries ||
sti->index_entries[sti->nb_index_entries - 1].pos < pos) {
av_add_index_entry(st, pos, ast->frame_offset, size,
0, AVINDEX_KEYFRAME);
}
}
return 0;
}
}
}
if (pb->error)
return pb->error;
return AVERROR_EOF;
}
static int ni_prepare_read(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
int best_stream_index = 0;
AVStream *best_st = NULL;
FFStream *best_sti;
AVIStream *best_ast;
int64_t best_ts = INT64_MAX;
int i;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
FFStream *const sti = ffstream(st);
AVIStream *ast = st->priv_data;
int64_t ts = ast->frame_offset;
int64_t last_ts;
if (!sti->nb_index_entries)
continue;
last_ts = sti->index_entries[sti->nb_index_entries - 1].timestamp;
if (!ast->remaining && ts > last_ts)
continue;
ts = av_rescale_q(ts, st->time_base,
(AVRational) { FFMAX(1, ast->sample_size),
AV_TIME_BASE });
av_log(s, AV_LOG_TRACE, "%"PRId64" %d/%d %"PRId64"\n", ts,
st->time_base.num, st->time_base.den, ast->frame_offset);
if (ts < best_ts) {
best_ts = ts;
best_st = st;
best_stream_index = i;
}
}
if (!best_st)
return AVERROR_EOF;
best_sti = ffstream(best_st);
best_ast = best_st->priv_data;
best_ts = best_ast->frame_offset;
if (best_ast->remaining) {
i = av_index_search_timestamp(best_st,
best_ts,
AVSEEK_FLAG_ANY |
AVSEEK_FLAG_BACKWARD);
} else {
i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
if (i >= 0)
best_ast->frame_offset = best_sti->index_entries[i].timestamp;
}
if (i >= 0) {
int64_t pos = best_sti->index_entries[i].pos;
pos += best_ast->packet_size - best_ast->remaining;
if (avio_seek(s->pb, pos + 8, SEEK_SET) < 0)
return AVERROR_EOF;
av_assert0(best_ast->remaining <= best_ast->packet_size);
avi->stream_index = best_stream_index;
if (!best_ast->remaining)
best_ast->packet_size =
best_ast->remaining = best_sti->index_entries[i].size;
}
else
return AVERROR_EOF;
return 0;
}
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int err;
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
if (size >= 0)
return size;
else
goto resync;
}
if (avi->non_interleaved) {
err = ni_prepare_read(s);
if (err < 0)
return err;
}
resync:
if (avi->stream_index >= 0) {
AVStream *st = s->streams[avi->stream_index];
FFStream *const sti = ffstream(st);
AVIStream *ast = st->priv_data;
int dv_demux = CONFIG_DV_DEMUXER && avi->dv_demux;
int size, err;
if (get_subtitle_pkt(s, st, pkt))
return 0;
// minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
if (ast->sample_size <= 1)
size = INT_MAX;
else if (ast->sample_size < 32)
// arbitrary multiplier to avoid tiny packets for raw PCM data
size = 1024 * ast->sample_size;
else
size = ast->sample_size;
if (size > ast->remaining)
size = ast->remaining;
avi->last_pkt_pos = avio_tell(pb);
err = av_get_packet(pb, pkt, size);
if (err < 0)
return err;
size = err;
if (ast->has_pal && pkt->size < (unsigned)INT_MAX / 2 && !dv_demux) {
uint8_t *pal;
pal = av_packet_new_side_data(pkt,
AV_PKT_DATA_PALETTE,
AVPALETTE_SIZE);
if (!pal) {
av_log(s, AV_LOG_ERROR,
"Failed to allocate data for palette\n");
} else {
memcpy(pal, ast->pal, AVPALETTE_SIZE);
ast->has_pal = 0;
}
}
if (CONFIG_DV_DEMUXER && dv_demux) {
size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
pkt->data, pkt->size, pkt->pos);
pkt->flags |= AV_PKT_FLAG_KEY;
if (size < 0)
av_packet_unref(pkt);
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE &&
!st->codecpar->codec_tag && read_gab2_sub(s, st, pkt)) {
ast->frame_offset++;
avi->stream_index = -1;
ast->remaining = 0;
goto resync;
} else {
/* XXX: How to handle B-frames in AVI? */
pkt->dts = ast->frame_offset;
// pkt->dts += ast->start;
if (ast->sample_size)
pkt->dts /= ast->sample_size;
pkt->stream_index = avi->stream_index;
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && sti->index_entries) {
AVIndexEntry *e;
int index;
index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY);
e = &sti->index_entries[index];
if (index >= 0 && e->timestamp == ast->frame_offset) {
if (index == sti->nb_index_entries-1) {
int key=1;
uint32_t state=-1;
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) {
const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256);
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &state);
if (state == 0x1B6 && ptr < end) {
key = !(*ptr & 0xC0);
break;
}
}
}
if (!key)
e->flags &= ~AVINDEX_KEYFRAME;
}
if (e->flags & AVINDEX_KEYFRAME)
pkt->flags |= AV_PKT_FLAG_KEY;
}
} else {
pkt->flags |= AV_PKT_FLAG_KEY;
}
ast->frame_offset += get_duration(ast, pkt->size);
}
ast->remaining -= err;
if (!ast->remaining) {
avi->stream_index = -1;
ast->packet_size = 0;
}
if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) {
av_packet_unref(pkt);
goto resync;
}
ast->seek_pos= 0;
if (!avi->non_interleaved && sti->nb_index_entries > 1 && avi->index_loaded > 1) {
int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q);
if (avi->dts_max < dts) {
avi->dts_max = dts;
} else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) {
avi->non_interleaved= 1;
av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n");
}
}
return 0;
}
if ((err = avi_sync(s, 0)) < 0)
return err;
goto resync;
}
/* XXX: We make the implicit supposition that the positions are sorted
* for each stream. */
static int avi_read_idx1(AVFormatContext *s, int size)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
int nb_index_entries, i;
AVStream *st;
AVIStream *ast;
int64_t pos;
unsigned int index, tag, flags, len, first_packet = 1;
int64_t last_pos = -1;
unsigned last_idx = -1;
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
int anykey = 0;
nb_index_entries = size / 16;
if (nb_index_entries <= 0)
return AVERROR_INVALIDDATA;
idx1_pos = avio_tell(pb);
avio_seek(pb, avi->movi_list + 4, SEEK_SET);
if (avi_sync(s, 1) == 0)
first_packet_pos = avio_tell(pb) - 8;
avi->stream_index = -1;
avio_seek(pb, idx1_pos, SEEK_SET);
if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) {
first_packet_pos = 0;
data_offset = avi->movi_list;
}
/* Read the entries and sort them in each stream component. */
for (i = 0; i < nb_index_entries; i++) {
if (avio_feof(pb))
return -1;
tag = avio_rl32(pb);
flags = avio_rl32(pb);
pos = avio_rl32(pb);
len = avio_rl32(pb);
av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" len=%d/",
i, tag, flags, pos, len);
index = ((tag & 0xff) - '0') * 10;
index += (tag >> 8 & 0xff) - '0';
if (index >= s->nb_streams)
continue;
st = s->streams[index];
ast = st->priv_data;
/* Skip 'xxpc' palette change entries in the index until a logic
* to process these is properly implemented. */
if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c')
continue;
if (first_packet && first_packet_pos) {
if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos)
data_offset = first_packet_pos - pos;
first_packet = 0;
}
pos += data_offset;
av_log(s, AV_LOG_TRACE, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
// even if we have only a single stream, we should
// switch to non-interleaved to get correct timestamps
if (last_pos == pos)
avi->non_interleaved = 1;
if (last_idx != pos && len) {
av_add_index_entry(st, pos, ast->cum_len, len, 0,
(flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
last_idx= pos;
}
ast->cum_len += get_duration(ast, len);
last_pos = pos;
anykey |= flags&AVIIF_INDEX;
}
if (!anykey) {
for (index = 0; index < s->nb_streams; index++) {
FFStream *const sti = ffstream(s->streams[index]);
if (sti->nb_index_entries)
sti->index_entries[0].flags |= AVINDEX_KEYFRAME;
}
}
return 0;
}
/* Scan the index and consider any file with streams more than
* 2 seconds or 64MB apart non-interleaved. */
static int check_stream_max_drift(AVFormatContext *s)
{
int64_t min_pos, pos;
int i;
int *idx = av_calloc(s->nb_streams, sizeof(*idx));
if (!idx)
return AVERROR(ENOMEM);
for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) {
int64_t max_dts = INT64_MIN / 2;
int64_t min_dts = INT64_MAX / 2;
int64_t max_buffer = 0;
min_pos = INT64_MAX;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
AVIStream *ast = st->priv_data;
FFStream *const sti = ffstream(st);
int n = sti->nb_index_entries;
while (idx[i] < n && sti->index_entries[idx[i]].pos < pos)
idx[i]++;
if (idx[i] < n) {
int64_t dts;
dts = av_rescale_q(sti->index_entries[idx[i]].timestamp /
FFMAX(ast->sample_size, 1),
st->time_base, AV_TIME_BASE_Q);
min_dts = FFMIN(min_dts, dts);
min_pos = FFMIN(min_pos, sti->index_entries[idx[i]].pos);
}
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
FFStream *const sti = ffstream(st);
AVIStream *ast = st->priv_data;
if (idx[i] && min_dts != INT64_MAX / 2) {
int64_t dts, delta_dts;
dts = av_rescale_q(sti->index_entries[idx[i] - 1].timestamp /
FFMAX(ast->sample_size, 1),
st->time_base, AV_TIME_BASE_Q);
delta_dts = av_sat_sub64(dts, min_dts);
max_dts = FFMAX(max_dts, dts);
max_buffer = FFMAX(max_buffer,
av_rescale(delta_dts,
st->codecpar->bit_rate,
AV_TIME_BASE));
}
}
if (av_sat_sub64(max_dts, min_dts) > 2 * AV_TIME_BASE ||
max_buffer > 1024 * 1024 * 8 * 8) {
av_free(idx);
return 1;
}
}
av_free(idx);
return 0;
}
static int guess_ni_flag(AVFormatContext *s)
{
int i;
int64_t last_start = 0;
int64_t first_end = INT64_MAX;
int64_t oldpos = avio_tell(s->pb);
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
FFStream *const sti = ffstream(st);
int n = sti->nb_index_entries;
unsigned int size;
if (n <= 0)
continue;
if (n >= 2) {
int64_t pos = sti->index_entries[0].pos;
unsigned tag[2];
avio_seek(s->pb, pos, SEEK_SET);
tag[0] = avio_r8(s->pb);
tag[1] = avio_r8(s->pb);
avio_rl16(s->pb);
size = avio_rl32(s->pb);
if (get_stream_idx(tag) == i && pos + size > sti->index_entries[1].pos)
last_start = INT64_MAX;
if (get_stream_idx(tag) == i && size == sti->index_entries[0].size + 8)
last_start = INT64_MAX;
}
if (sti->index_entries[0].pos > last_start)
last_start = sti->index_entries[0].pos;
if (sti->index_entries[n - 1].pos < first_end)
first_end = sti->index_entries[n - 1].pos;
}
avio_seek(s->pb, oldpos, SEEK_SET);
if (last_start > first_end)
return 1;
return check_stream_max_drift(s);
}
static int avi_load_index(AVFormatContext *s)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
uint32_t tag, size;
int64_t pos = avio_tell(pb);
int64_t next;
int ret = -1;
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
goto the_end; // maybe truncated file
av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end);
for (;;) {
tag = avio_rl32(pb);
size = avio_rl32(pb);
if (avio_feof(pb))
break;
next = avio_tell(pb);
if (next < 0 || next > INT64_MAX - size - (size & 1))
break;
next += size + (size & 1LL);
if (tag == MKTAG('i', 'd', 'x', '1') &&
avi_read_idx1(s, size) >= 0) {
avi->index_loaded=2;
ret = 0;
}else if (tag == MKTAG('L', 'I', 'S', 'T')) {
uint32_t tag1 = avio_rl32(pb);
if (tag1 == MKTAG('I', 'N', 'F', 'O'))
ff_read_riff_info(s, size - 4);
}else if (!ret)
break;
if (avio_seek(pb, next, SEEK_SET) < 0)
break; // something is wrong here
}
the_end:
avio_seek(pb, pos, SEEK_SET);
return ret;
}
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
{
AVIStream *ast2 = st2->priv_data;
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
av_packet_unref(ast2->sub_pkt);
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
ff_read_packet(ast2->sub_ctx, ast2->sub_pkt);
}
static int avi_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
AVIContext *avi = s->priv_data;
AVStream *st;
FFStream *sti;
int i, index;
int64_t pos, pos_min;
AVIStream *ast;
/* Does not matter which stream is requested dv in avi has the
* stream information in the first video stream.
*/
if (avi->dv_demux)
stream_index = 0;
if (!avi->index_loaded) {
/* we only load the index on demand */
avi_load_index(s);
avi->index_loaded |= 1;
}
av_assert0(stream_index >= 0);
st = s->streams[stream_index];
sti = ffstream(st);
ast = st->priv_data;
index = av_index_search_timestamp(st,
timestamp * FFMAX(ast->sample_size, 1),
flags);
if (index < 0) {
if (sti->nb_index_entries > 0)
av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n",
timestamp * FFMAX(ast->sample_size, 1),
sti->index_entries[0].timestamp,
sti->index_entries[sti->nb_index_entries - 1].timestamp);
return AVERROR_INVALIDDATA;
}
/* find the position */
pos = sti->index_entries[index].pos;
timestamp = sti->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n",
timestamp, index, sti->index_entries[index].timestamp);
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
/* One and only one real stream for DV in AVI, and it has video */
/* offsets. Calling with other stream indexes should have failed */
/* the av_index_search_timestamp call above. */
if (avio_seek(s->pb, pos, SEEK_SET) < 0)
return -1;
/* Feed the DV video stream version of the timestamp to the */
/* DV demux so it can synthesize correct timestamps. */
ff_dv_offset_reset(avi->dv_demux, timestamp);
avi->stream_index = -1;
return 0;
}
pos_min = pos;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st2 = s->streams[i];
FFStream *const sti2 = ffstream(st2);
AVIStream *ast2 = st2->priv_data;
ast2->packet_size =
ast2->remaining = 0;
if (ast2->sub_ctx) {
seek_subtitle(st, st2, timestamp);
continue;
}
if (sti2->nb_index_entries <= 0)
continue;
// av_assert1(st2->codecpar->block_align);
index = av_index_search_timestamp(st2,
av_rescale_q(timestamp,
st->time_base,
st2->time_base) *
FFMAX(ast2->sample_size, 1),
flags |
AVSEEK_FLAG_BACKWARD |
(st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
if (index < 0)
index = 0;
ast2->seek_pos = sti2->index_entries[index].pos;
pos_min = FFMIN(pos_min,ast2->seek_pos);
}
for (i = 0; i < s->nb_streams; i++) {
AVStream *st2 = s->streams[i];
FFStream *const sti2 = ffstream(st2);
AVIStream *ast2 = st2->priv_data;
if (ast2->sub_ctx || sti2->nb_index_entries <= 0)
continue;
index = av_index_search_timestamp(
st2,
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
flags | AVSEEK_FLAG_BACKWARD | (st2->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0));
if (index < 0)
index = 0;
while (!avi->non_interleaved && index > 0 && sti2->index_entries[index-1].pos >= pos_min)
index--;
ast2->frame_offset = sti2->index_entries[index].timestamp;
}
/* do the seek */
if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) {
av_log(s, AV_LOG_ERROR, "Seek failed\n");
return -1;
}
avi->stream_index = -1;
avi->dts_max = INT_MIN;
return 0;
}
static int avi_read_close(AVFormatContext *s)
{
int i;
AVIContext *avi = s->priv_data;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
AVIStream *ast = st->priv_data;
if (ast) {
if (ast->sub_ctx) {
av_freep(&ast->sub_ctx->pb);
avformat_close_input(&ast->sub_ctx);
}
av_buffer_unref(&ast->sub_buffer);
av_packet_free(&ast->sub_pkt);
}
}
av_freep(&avi->dv_demux);
return 0;
}
static int avi_probe(const AVProbeData *p)
{
int i;
/* check file header */
for (i = 0; avi_headers[i][0]; i++)
if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) &&
AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4))
return AVPROBE_SCORE_MAX;
return 0;
}
const AVInputFormat ff_avi_demuxer = {
.name = "avi",
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
.priv_data_size = sizeof(AVIContext),
.flags_internal = FF_FMT_INIT_CLEANUP,
.extensions = "avi",
.read_probe = avi_probe,
.read_header = avi_read_header,
.read_packet = avi_read_packet,
.read_close = avi_read_close,
.read_seek = avi_read_seek,
.priv_class = &demuxer_class,
};
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