0,0 → 1,1934 |
/* |
* 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 <inttypes.h> |
|
#include "libavutil/avassert.h" |
#include "libavutil/avstring.h" |
#include "libavutil/bswap.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 "dv.h" |
#include "internal.h" |
#include "isom.h" |
#include "riff.h" |
#include "libavcodec/bytestream.h" |
#include "libavcodec/exif.h" |
#include "libavcodec/internal.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; |
uint8_t *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; |
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_INT, {.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" }, |
{ 0 }, |
}; |
|
static int avi_load_index(AVFormatContext *s); |
static int guess_ni_flag(AVFormatContext *s); |
|
#define print_tag(str, tag, size) \ |
av_log(NULL, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%c%c%c%c size=0x%x\n", \ |
avio_tell(pb), str, tag & 0xff, \ |
(tag >> 8) & 0xff, \ |
(tag >> 16) & 0xff, \ |
(tag >> 24) & 0xff, \ |
size) |
|
static inline int get_duration(AVIStream *ast, int len) |
{ |
if (ast->sample_size) |
return len; |
else if (ast->dshow_block_align) |
return (len + 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_braindead_odml_indx(AVFormatContext *s, int frame_num) |
{ |
AVIContext *avi = s->priv_data; |
AVIOContext *pb = s->pb; |
int longs_pre_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_pre_entry:%d index_type:%d entries_in_use:%d " |
"chunk_id:%X base:%16"PRIX64" frame_num:%d\n", |
longs_pre_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) |
return AVERROR_INVALIDDATA; |
|
avio_rl32(pb); |
|
if (index_type && longs_pre_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++) { |
if (index_type) { |
int64_t pos = avio_rl32(pb) + base - 8; |
int len = avio_rl32(pb); |
int key = len >= 0; |
len &= 0x7FFFFFFF; |
|
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; |
offset = avio_rl64(pb); |
avio_rl32(pb); /* size */ |
duration = avio_rl32(pb); |
|
if (avio_feof(pb)) |
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++; |
read_braindead_odml_indx(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; |
} |
|
} |
} |
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]; |
AVIStream *ast = st->priv_data; |
int n = st->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 = st->index_entries[0].pos; |
size = st->index_entries[0].size; |
ts = st->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) |
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) { |
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) { |
uint16_t tag = avio_rl16(s->pb); |
uint16_t size = avio_rl16(s->pb); |
const char *name = NULL; |
char buffer[64] = { 0 }; |
size = FFMIN(size, tag_end - avio_tell(s->pb)); |
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(AVStream *st) |
{ |
GetByteContext gb; |
uint8_t *data = st->codec->extradata; |
int data_size = st->codec->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); |
bytestream2_init(&gb, data + offset, data_size - offset); |
|
// decode EXIF tags from IFD, AVI is always little-endian |
return avpriv_exif_decode_ifd(st->codec, &gb, 1, 0, &st->metadata); |
break; |
case MKTAG('C', 'A', 'S', 'I'): |
avpriv_request_sample(st->codec, "RIFF stream data tag type CASI (%u)", tag); |
break; |
case MKTAG('Z', 'o', 'r', 'a'): |
avpriv_request_sample(st->codec, "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; |
AVStream *st = s->streams[i]; |
|
if (!st->nb_index_entries) |
continue; |
|
for (j = 0; j < st->nb_index_entries; j++) |
len += st->index_entries[j].size; |
maxpos = FFMAX(maxpos, st->index_entries[j-1].pos); |
lensum += len; |
} |
if (maxpos < 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]; |
int64_t duration; |
int64_t bitrate; |
|
for (j = 0; j < st->nb_index_entries; j++) |
len += st->index_entries[j].size; |
|
if (st->nb_index_entries < 2 || st->codec->bit_rate > 0) |
continue; |
duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp; |
bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); |
if (bitrate <= INT_MAX && bitrate > 0) { |
st->codec->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; |
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)) |
goto fail; |
tag = avio_rl32(pb); |
size = avio_rl32(pb); |
|
print_tag("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("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(NULL, 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) |
goto fail; |
|
st->id = stream_index; |
ast = av_mallocz(sizeof(AVIStream)); |
if (!ast) |
goto fail; |
st->priv_data = ast; |
} |
if (amv_file_format) |
tag1 = stream_index ? MKTAG('a', 'u', 'd', 's') |
: MKTAG('v', 'i', 'd', 's'); |
|
print_tag("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) |
goto fail; |
|
if (handler != MKTAG('d', 'v', 's', 'd') && |
handler != MKTAG('d', 'v', 'h', 'd') && |
handler != MKTAG('d', 'v', 's', 'l')) |
goto fail; |
|
ast = s->streams[0]->priv_data; |
av_freep(&s->streams[0]->codec->extradata); |
av_freep(&s->streams[0]->codec); |
if (s->streams[0]->info) |
av_freep(&s->streams[0]->info->duration_error); |
av_freep(&s->streams[0]->info); |
av_freep(&s->streams[0]); |
s->nb_streams = 0; |
if (CONFIG_DV_DEMUXER) { |
avi->dv_demux = avpriv_dv_init_demux(s); |
if (!avi->dv_demux) |
goto fail; |
} else |
goto fail; |
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*ast->scale/ast->rate > 3600) { |
av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); |
ast->cum_len = 0; |
} |
ast->sample_size = avio_rl32(pb); /* sample ssize */ |
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); |
goto fail; |
} |
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) |
break; |
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { |
avio_skip(pb, size); |
} else { |
uint64_t cur_pos = avio_tell(pb); |
unsigned esize; |
if (cur_pos < list_end) |
size = FFMIN(size, list_end - cur_pos); |
st = s->streams[stream_index]; |
if (st->codec->codec_type != AVMEDIA_TYPE_UNKNOWN) { |
avio_skip(pb, size); |
break; |
} |
switch (codec_type) { |
case AVMEDIA_TYPE_VIDEO: |
if (amv_file_format) { |
st->codec->width = avih_width; |
st->codec->height = avih_height; |
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
st->codec->codec_tag = tag1; |
st->codec->codec_id = AV_CODEC_ID_XSUB; |
break; |
} |
|
if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) { |
if (esize == size-1 && (esize&1)) { |
st->codec->extradata_size = esize - 10 * 4; |
} else |
st->codec->extradata_size = size - 10 * 4; |
if (ff_get_extradata(st->codec, pb, st->codec->extradata_size) < 0) |
return AVERROR(ENOMEM); |
} |
|
// FIXME: check if the encoder really did this correctly |
if (st->codec->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->codec->extradata_size && |
(st->codec->bits_per_coded_sample <= 8)) { |
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; |
const uint8_t *pal_src; |
|
pal_size = FFMIN(pal_size, st->codec->extradata_size); |
pal_src = st->codec->extradata + |
st->codec->extradata_size - pal_size; |
/* Exclude the "BottomUp" field from the palette */ |
if (pal_src - st->codec->extradata >= 9 && |
!memcmp(st->codec->extradata + st->codec->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("video", tag1, 0); |
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
st->codec->codec_tag = tag1; |
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, |
tag1); |
/* If codec is not found yet, try with the mov tags. */ |
if (!st->codec->codec_id) { |
char tag_buf[32]; |
av_get_codec_tag_string(tag_buf, sizeof(tag_buf), tag1); |
st->codec->codec_id = |
ff_codec_get_id(ff_codec_movvideo_tags, tag1); |
if (st->codec->codec_id) |
av_log(s, AV_LOG_WARNING, |
"mov tag found in avi (fourcc %s)\n", |
tag_buf); |
} |
/* This is needed to get the pict type which is necessary |
* for generating correct pts. */ |
st->need_parsing = AVSTREAM_PARSE_HEADERS; |
|
if (st->codec->codec_id == AV_CODEC_ID_MPEG4 && |
ast->handler == MKTAG('X', 'V', 'I', 'D')) |
st->codec->codec_tag = MKTAG('X', 'V', 'I', 'D'); |
|
if (st->codec->codec_tag == MKTAG('V', 'S', 'S', 'H')) |
st->need_parsing = AVSTREAM_PARSE_FULL; |
|
if (st->codec->codec_tag == 0 && st->codec->height > 0 && |
st->codec->extradata_size < 1U << 30) { |
st->codec->extradata_size += 9; |
if ((ret = av_reallocp(&st->codec->extradata, |
st->codec->extradata_size + |
AV_INPUT_BUFFER_PADDING_SIZE)) < 0) { |
st->codec->extradata_size = 0; |
return ret; |
} else |
memcpy(st->codec->extradata + st->codec->extradata_size - 9, |
"BottomUp", 9); |
} |
st->codec->height = FFABS(st->codec->height); |
|
// avio_skip(pb, size - 5 * 4); |
break; |
case AVMEDIA_TYPE_AUDIO: |
ret = ff_get_wav_header(s, pb, st->codec, size, 0); |
if (ret < 0) |
return ret; |
ast->dshow_block_align = st->codec->block_align; |
if (ast->sample_size && st->codec->block_align && |
ast->sample_size != st->codec->block_align) { |
av_log(s, |
AV_LOG_WARNING, |
"sample size (%d) != block align (%d)\n", |
ast->sample_size, |
st->codec->block_align); |
ast->sample_size = st->codec->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. */ |
st->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->codec->codec_id == AV_CODEC_ID_AAC && |
st->codec->extradata_size) |
st->need_parsing = AVSTREAM_PARSE_NONE; |
// The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS |
if (st->codec->codec_id == AV_CODEC_ID_FLAC) |
st->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->codec->codec_id = AV_CODEC_ID_XAN_DPCM; |
st->codec->codec_tag = 0; |
ast->dshow_block_align = 0; |
} |
if (amv_file_format) { |
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; |
ast->dshow_block_align = 0; |
} |
if ((st->codec->codec_id == AV_CODEC_ID_AAC || |
st->codec->codec_id == AV_CODEC_ID_FLAC || |
st->codec->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->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 || |
st->codec->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 || |
st->codec->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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
st->request_probe= 1; |
avio_skip(pb, size); |
break; |
default: |
st->codec->codec_type = AVMEDIA_TYPE_DATA; |
st->codec->codec_id = AV_CODEC_ID_NONE; |
st->codec->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]->codec->extradata_size |
|| s->streams[stream_index]->codec->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 (ff_get_extradata(st->codec, pb, size) < 0) |
return AVERROR(ENOMEM); |
} |
|
if (st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly |
avio_r8(pb); |
|
ret = avi_extract_stream_metadata(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'): |
i = avio_tell(pb); |
if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && |
avi->use_odml && |
read_braindead_odml_indx(s, 0) < 0 && |
(s->error_recognition & AV_EF_EXPLODE)) |
goto fail; |
avio_seek(pb, i + 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'): |
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, " |
"I will ignore it and try to continue anyway.\n"); |
if (s->error_recognition & AV_EF_EXPLODE) |
goto fail; |
avi->movi_list = avio_tell(pb) - 4; |
avi->movi_end = avi->fsize; |
goto end_of_header; |
} |
/* skip tag */ |
size += (size & 1); |
avio_skip(pb, size); |
break; |
} |
} |
|
end_of_header: |
/* check stream number */ |
if (stream_index != s->nb_streams - 1) { |
|
fail: |
return AVERROR_INVALIDDATA; |
} |
|
if (!avi->index_loaded && pb->seekable) |
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->codec->codec_id == AV_CODEC_ID_MPEG1VIDEO |
|| st->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO) |
st->need_parsing = AVSTREAM_PARSE_FULL; |
} |
|
for (i = 0; i < s->nb_streams; i++) { |
AVStream *st = s->streams[i]; |
if (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; |
AVInputFormat *sub_demuxer; |
AVRational time_base; |
int size; |
AVIOContext *pb = avio_alloc_context(pkt->data + 7, |
pkt->size - 7, |
0, NULL, NULL, NULL, NULL); |
AVProbeData pd; |
unsigned int 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 (!(ast->sub_ctx = avformat_alloc_context())) |
goto error; |
|
ast->sub_ctx->pb = pb; |
|
if (ff_copy_whitelists(ast->sub_ctx, s) < 0) |
goto error; |
|
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { |
ff_read_packet(ast->sub_ctx, &ast->sub_pkt); |
*st->codec = *ast->sub_ctx->streams[0]->codec; |
ast->sub_ctx->streams[0]->codec->extradata = NULL; |
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->data; |
memset(pkt, 0, sizeof(*pkt)); |
return 1; |
|
error: |
av_freep(&ast->sub_ctx); |
av_freep(&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.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; |
*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')) { |
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 (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 ( d[2] == 'w' && d[3] == 'b' |
&& n == 0 |
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO |
&& st1->codec->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 (!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)) { |
if (!exit_early) { |
ast->frame_offset += get_duration(ast, size); |
avio_skip(pb, size); |
goto start_sync; |
} |
} |
|
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; |
} |
|
avi->stream_index = n; |
ast->packet_size = size + 8; |
ast->remaining = size; |
|
if (size) { |
uint64_t pos = avio_tell(pb) - 8; |
if (!st->index_entries || !st->nb_index_entries || |
st->index_entries[st->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 avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
AVIContext *avi = s->priv_data; |
AVIOContext *pb = s->pb; |
int err; |
#if FF_API_DESTRUCT_PACKET |
void *dstr; |
#endif |
|
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) { |
int best_stream_index = 0; |
AVStream *best_st = NULL; |
AVIStream *best_ast; |
int64_t best_ts = INT64_MAX; |
int i; |
|
for (i = 0; i < s->nb_streams; i++) { |
AVStream *st = s->streams[i]; |
AVIStream *ast = st->priv_data; |
int64_t ts = ast->frame_offset; |
int64_t last_ts; |
|
if (!st->nb_index_entries) |
continue; |
|
last_ts = st->index_entries[st->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_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_st->index_entries[i].timestamp; |
} |
|
if (i >= 0) { |
int64_t pos = best_st->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_st->index_entries[i].size; |
} |
else |
return AVERROR_EOF; |
} |
|
resync: |
if (avi->stream_index >= 0) { |
AVStream *st = s->streams[avi->stream_index]; |
AVIStream *ast = st->priv_data; |
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) { |
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 && avi->dv_demux) { |
AVBufferRef *avbuf = pkt->buf; |
#if FF_API_DESTRUCT_PACKET |
FF_DISABLE_DEPRECATION_WARNINGS |
dstr = pkt->destruct; |
FF_ENABLE_DEPRECATION_WARNINGS |
#endif |
size = avpriv_dv_produce_packet(avi->dv_demux, pkt, |
pkt->data, pkt->size, pkt->pos); |
#if FF_API_DESTRUCT_PACKET |
FF_DISABLE_DEPRECATION_WARNINGS |
pkt->destruct = dstr; |
FF_ENABLE_DEPRECATION_WARNINGS |
#endif |
pkt->buf = avbuf; |
pkt->flags |= AV_PKT_FLAG_KEY; |
if (size < 0) |
av_free_packet(pkt); |
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE && |
!st->codec->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; |
av_log(s, AV_LOG_TRACE, |
"dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d " |
"base:%d st:%d size:%d\n", |
pkt->dts, |
ast->frame_offset, |
ast->scale, |
ast->rate, |
ast->sample_size, |
AV_TIME_BASE, |
avi->stream_index, |
size); |
pkt->stream_index = avi->stream_index; |
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) { |
AVIndexEntry *e; |
int index; |
|
index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY); |
e = &st->index_entries[index]; |
|
if (index >= 0 && e->timestamp == ast->frame_offset) { |
if (index == st->nb_index_entries-1) { |
int key=1; |
uint32_t state=-1; |
if (st->codec->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_free_packet(pkt); |
goto resync; |
} |
ast->seek_pos= 0; |
|
if (!avi->non_interleaved && st->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 > 2*AV_TIME_BASE) { |
avi->non_interleaved= 1; |
av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); |
}else if (avi->dts_max < dts) |
avi->dts_max = dts; |
} |
|
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; |
unsigned int index, tag, flags, pos, len, first_packet = 1; |
unsigned 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]->codec->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%x 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; |
|
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++) { |
st = s->streams[index]; |
if (st->nb_index_entries) |
st->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_mallocz_array(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; |
int n = st->nb_index_entries; |
while (idx[i] < n && st->index_entries[idx[i]].pos < pos) |
idx[i]++; |
if (idx[i] < n) { |
int64_t dts; |
dts = av_rescale_q(st->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, st->index_entries[idx[i]].pos); |
} |
} |
for (i = 0; i < s->nb_streams; i++) { |
AVStream *st = s->streams[i]; |
AVIStream *ast = st->priv_data; |
|
if (idx[i] && min_dts != INT64_MAX / 2) { |
int64_t dts; |
dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp / |
FFMAX(ast->sample_size, 1), |
st->time_base, AV_TIME_BASE_Q); |
max_dts = FFMAX(max_dts, dts); |
max_buffer = FFMAX(max_buffer, |
av_rescale(dts - min_dts, |
st->codec->bit_rate, |
AV_TIME_BASE)); |
} |
} |
if (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]; |
int n = st->nb_index_entries; |
unsigned int size; |
|
if (n <= 0) |
continue; |
|
if (n >= 2) { |
int64_t pos = st->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 > st->index_entries[1].pos) |
last_start = INT64_MAX; |
} |
|
if (st->index_entries[0].pos > last_start) |
last_start = st->index_entries[0].pos; |
if (st->index_entries[n - 1].pos < first_end) |
first_end = st->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) + size + (size & 1); |
|
av_log(s, AV_LOG_TRACE, "tag=%c%c%c%c size=0x%x\n", |
tag & 0xff, |
(tag >> 8) & 0xff, |
(tag >> 16) & 0xff, |
(tag >> 24) & 0xff, |
size); |
|
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_free_packet(&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; |
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]; |
ast = st->priv_data; |
index = av_index_search_timestamp(st, |
timestamp * FFMAX(ast->sample_size, 1), |
flags); |
if (index < 0) { |
if (st->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), |
st->index_entries[0].timestamp, |
st->index_entries[st->nb_index_entries - 1].timestamp); |
return AVERROR_INVALIDDATA; |
} |
|
/* find the position */ |
pos = st->index_entries[index].pos; |
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); |
|
av_log(s, AV_LOG_TRACE, "XX %"PRId64" %d %"PRId64"\n", |
timestamp, index, st->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]; |
AVIStream *ast2 = st2->priv_data; |
|
ast2->packet_size = |
ast2->remaining = 0; |
|
if (ast2->sub_ctx) { |
seek_subtitle(st, st2, timestamp); |
continue; |
} |
|
if (st2->nb_index_entries <= 0) |
continue; |
|
// av_assert1(st2->codec->block_align); |
av_assert0(fabs(av_q2d(st2->time_base) - ast2->scale / (double)ast2->rate) < av_q2d(st2->time_base) * 0.00000001); |
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->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
if (index < 0) |
index = 0; |
ast2->seek_pos = st2->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]; |
AVIStream *ast2 = st2->priv_data; |
|
if (ast2->sub_ctx || st2->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->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); |
if (index < 0) |
index = 0; |
while (!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) |
index--; |
ast2->frame_offset = st2->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_freep(&ast->sub_buffer); |
av_free_packet(&ast->sub_pkt); |
} |
} |
|
av_freep(&avi->dv_demux); |
|
return 0; |
} |
|
static int avi_probe(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; |
} |
|
AVInputFormat ff_avi_demuxer = { |
.name = "avi", |
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), |
.priv_data_size = sizeof(AVIContext), |
.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, |
}; |