mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
310 lines
9.1 KiB
310 lines
9.1 KiB
/* |
|
* AVI decoder. |
|
* Copyright (c) 2001 Fabrice Bellard. |
|
* |
|
* This library 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 of the License, or (at your option) any later version. |
|
* |
|
* This library 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 this library; if not, write to the Free Software |
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
|
*/ |
|
#include "avformat.h" |
|
#include "avi.h" |
|
|
|
//#define DEBUG |
|
|
|
typedef struct AVIIndex { |
|
unsigned char tag[4]; |
|
unsigned int flags, pos, len; |
|
struct AVIIndex *next; |
|
} AVIIndex; |
|
|
|
typedef struct { |
|
int64_t movi_end; |
|
offset_t movi_list; |
|
AVIIndex *first, *last; |
|
} AVIContext; |
|
|
|
#ifdef DEBUG |
|
static void print_tag(const char *str, unsigned int tag, int size) |
|
{ |
|
printf("%s: tag=%c%c%c%c size=0x%x\n", |
|
str, tag & 0xff, |
|
(tag >> 8) & 0xff, |
|
(tag >> 16) & 0xff, |
|
(tag >> 24) & 0xff, |
|
size); |
|
} |
|
#endif |
|
|
|
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
ByteIOContext *pb = &s->pb; |
|
uint32_t tag, tag1; |
|
int codec_type, stream_index, frame_period, bit_rate, scale, rate; |
|
unsigned int size; |
|
int i; |
|
AVStream *st; |
|
|
|
/* check RIFF header */ |
|
tag = get_le32(pb); |
|
|
|
if (tag != MKTAG('R', 'I', 'F', 'F')) |
|
return -1; |
|
get_le32(pb); /* file size */ |
|
tag = get_le32(pb); |
|
if (tag != MKTAG('A', 'V', 'I', ' ')) |
|
return -1; |
|
|
|
/* first list tag */ |
|
stream_index = -1; |
|
codec_type = -1; |
|
frame_period = 0; |
|
for(;;) { |
|
if (url_feof(pb)) |
|
goto fail; |
|
tag = get_le32(pb); |
|
size = get_le32(pb); |
|
#ifdef DEBUG |
|
print_tag("tag", tag, size); |
|
#endif |
|
|
|
switch(tag) { |
|
case MKTAG('L', 'I', 'S', 'T'): |
|
/* ignored, except when start of video packets */ |
|
tag1 = get_le32(pb); |
|
#ifdef DEBUG |
|
print_tag("list", tag1, 0); |
|
#endif |
|
if (tag1 == MKTAG('m', 'o', 'v', 'i')) { |
|
avi->movi_end = url_ftell(pb) + size - 4; |
|
#ifdef DEBUG |
|
printf("movi end=%Lx\n", avi->movi_end); |
|
#endif |
|
goto end_of_header; |
|
} |
|
break; |
|
case MKTAG('a', 'v', 'i', 'h'): |
|
/* avi header */ |
|
/* using frame_period is bad idea */ |
|
frame_period = get_le32(pb); |
|
bit_rate = get_le32(pb) * 8; |
|
url_fskip(pb, 4 * 4); |
|
s->nb_streams = get_le32(pb); |
|
for(i=0;i<s->nb_streams;i++) { |
|
AVStream *st = av_mallocz(sizeof(AVStream)); |
|
if (!st) |
|
goto fail; |
|
avcodec_get_context_defaults(&st->codec); |
|
|
|
s->streams[i] = st; |
|
} |
|
url_fskip(pb, size - 7 * 4); |
|
break; |
|
case MKTAG('s', 't', 'r', 'h'): |
|
/* stream header */ |
|
stream_index++; |
|
tag1 = get_le32(pb); |
|
switch(tag1) { |
|
case MKTAG('v', 'i', 'd', 's'): |
|
codec_type = CODEC_TYPE_VIDEO; |
|
|
|
if (stream_index >= s->nb_streams) { |
|
url_fskip(pb, size - 4); |
|
break; |
|
} |
|
|
|
st = s->streams[stream_index]; |
|
|
|
get_le32(pb); /* codec tag */ |
|
get_le32(pb); /* flags */ |
|
get_le16(pb); /* priority */ |
|
get_le16(pb); /* language */ |
|
get_le32(pb); /* XXX: initial frame ? */ |
|
scale= get_le32(pb); /* scale */ |
|
rate= get_le32(pb); /* rate */ |
|
|
|
if(scale && rate){ |
|
st->codec.frame_rate = rate; |
|
st->codec.frame_rate_base= scale; |
|
}else if(frame_period){ |
|
st->codec.frame_rate = 1000000; |
|
st->codec.frame_rate_base= frame_period; |
|
}else{ |
|
st->codec.frame_rate = 25; |
|
st->codec.frame_rate_base = 1; |
|
} |
|
|
|
url_fskip(pb, size - 7 * 4); |
|
break; |
|
case MKTAG('a', 'u', 'd', 's'): |
|
codec_type = CODEC_TYPE_AUDIO; |
|
/* nothing really useful */ |
|
url_fskip(pb, size - 4); |
|
break; |
|
default: |
|
goto fail; |
|
} |
|
break; |
|
case MKTAG('s', 't', 'r', 'f'): |
|
/* stream header */ |
|
if (stream_index >= s->nb_streams) { |
|
url_fskip(pb, size); |
|
} else { |
|
st = s->streams[stream_index]; |
|
switch(codec_type) { |
|
case CODEC_TYPE_VIDEO: |
|
get_le32(pb); /* size */ |
|
st->codec.width = get_le32(pb); |
|
st->codec.height = get_le32(pb); |
|
get_le16(pb); /* panes */ |
|
st->codec.bits_per_sample= get_le16(pb); /* depth */ |
|
tag1 = get_le32(pb); |
|
get_le32(pb); /* ImageSize */ |
|
get_le32(pb); /* XPelsPerMeter */ |
|
get_le32(pb); /* YPelsPerMeter */ |
|
get_le32(pb); /* ClrUsed */ |
|
get_le32(pb); /* ClrImportant */ |
|
|
|
st->codec.extradata_size= size - 10*4; |
|
st->codec.extradata= av_malloc(st->codec.extradata_size); //FIXME where should we free this? |
|
get_buffer(pb, st->codec.extradata, st->codec.extradata_size); |
|
|
|
if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly |
|
get_byte(pb); |
|
|
|
#ifdef DEBUG |
|
print_tag("video", tag1, 0); |
|
#endif |
|
st->codec.codec_type = CODEC_TYPE_VIDEO; |
|
st->codec.codec_tag = tag1; |
|
st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1); |
|
// url_fskip(pb, size - 5 * 4); |
|
break; |
|
case CODEC_TYPE_AUDIO: |
|
get_wav_header(pb, &st->codec, size); |
|
if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ |
|
url_fskip(pb, 1); |
|
break; |
|
default: |
|
url_fskip(pb, size); |
|
break; |
|
} |
|
} |
|
break; |
|
default: |
|
/* skip tag */ |
|
size += (size & 1); |
|
url_fskip(pb, size); |
|
break; |
|
} |
|
} |
|
end_of_header: |
|
/* check stream number */ |
|
if (stream_index != s->nb_streams - 1) { |
|
fail: |
|
for(i=0;i<s->nb_streams;i++) { |
|
av_freep(&s->streams[i]->codec.extradata); |
|
av_freep(&s->streams[i]); |
|
} |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
AVIContext *avi = s->priv_data; |
|
ByteIOContext *pb = &s->pb; |
|
int n, d[8], size, i; |
|
|
|
memset(d, -1, sizeof(int)*8); |
|
|
|
for(i=url_ftell(pb); (!url_feof(pb)) && i < avi->movi_end; i++){ |
|
int j; |
|
|
|
for(j=0; j<7; j++) |
|
d[j]= d[j+1]; |
|
d[7]= get_byte(pb); |
|
|
|
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); |
|
|
|
//parse ix## |
|
n= (d[2] - '0') * 10 + (d[3] - '0'); |
|
if( d[2] >= '0' && d[2] <= '9' |
|
&& d[3] >= '0' && d[3] <= '9' |
|
&& d[0] == 'i' && d[1] == 'x' |
|
&& n < s->nb_streams |
|
&& i + size <= avi->movi_end){ |
|
|
|
url_fskip(pb, size); |
|
} |
|
|
|
//parse ##dc/##wb |
|
n= (d[0] - '0') * 10 + (d[1] - '0'); |
|
if( d[0] >= '0' && d[0] <= '9' |
|
&& d[1] >= '0' && d[1] <= '9' |
|
&&((d[2] == 'd' && d[3] == 'c') || (d[2] == 'w' && d[3] == 'b') || (d[2] == 'd' && d[3] == 'b') ) |
|
|
|
&& n < s->nb_streams |
|
&& i + size <= avi->movi_end){ |
|
|
|
av_new_packet(pkt, size); |
|
pkt->stream_index = n; |
|
|
|
get_buffer(pb, pkt->data, pkt->size); |
|
|
|
if (size & 1) |
|
get_byte(pb); |
|
|
|
return 0; |
|
} |
|
} |
|
|
|
return -1; |
|
} |
|
|
|
static int avi_read_close(AVFormatContext *s) |
|
{ |
|
return 0; |
|
} |
|
|
|
static int avi_probe(AVProbeData *p) |
|
{ |
|
/* check file header */ |
|
if (p->buf_size <= 32) |
|
return 0; |
|
if (p->buf[0] == 'R' && p->buf[1] == 'I' && |
|
p->buf[2] == 'F' && p->buf[3] == 'F' && |
|
p->buf[8] == 'A' && p->buf[9] == 'V' && |
|
p->buf[10] == 'I' && p->buf[11] == ' ') |
|
return AVPROBE_SCORE_MAX; |
|
else |
|
return 0; |
|
} |
|
|
|
static AVInputFormat avi_iformat = { |
|
"avi", |
|
"avi format", |
|
sizeof(AVIContext), |
|
avi_probe, |
|
avi_read_header, |
|
avi_read_packet, |
|
avi_read_close, |
|
}; |
|
|
|
int avidec_init(void) |
|
{ |
|
av_register_input_format(&avi_iformat); |
|
return 0; |
|
}
|
|
|