mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
7458ccbb02
decoding. All muxing/demuxing functionality is now available
in libavformat/dv.[ch].
* dv1394.c and avidec.c were hooked up with general DV demuxer.
* DVAUDIO is dead! Long live pcm_s16le!
* DV audio is now always recognized -- which means we can
now hear all those ducks quaking in pond.dv.
Originally committed as revision 2319 to svn://svn.ffmpeg.org/ffmpeg/trunk
417 lines
12 KiB
C
417 lines
12 KiB
C
/*
|
|
* 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"
|
|
#include "dv.h"
|
|
|
|
//#define DEBUG
|
|
|
|
typedef struct AVIIndex {
|
|
unsigned char tag[4];
|
|
unsigned int flags, pos, len;
|
|
struct AVIIndex *next;
|
|
} AVIIndex;
|
|
|
|
typedef struct {
|
|
int64_t riff_end;
|
|
int64_t movi_end;
|
|
offset_t movi_list;
|
|
AVIIndex *first, *last;
|
|
void* dv_demux;
|
|
} 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 get_riff(AVIContext *avi, ByteIOContext *pb)
|
|
{
|
|
uint32_t tag;
|
|
/* check RIFF header */
|
|
tag = get_le32(pb);
|
|
|
|
if (tag != MKTAG('R', 'I', 'F', 'F'))
|
|
return -1;
|
|
avi->riff_end = get_le32(pb); /* RIFF chunk size */
|
|
avi->riff_end += url_ftell(pb); /* RIFF chunk end */
|
|
tag = get_le32(pb);
|
|
if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
uint32_t tag, tag1, handler;
|
|
int codec_type, stream_index, frame_period, bit_rate, scale, rate;
|
|
unsigned int size, nb_frames;
|
|
int i, n;
|
|
AVStream *st;
|
|
int xan_video = 0; /* hack to support Xan A/V */
|
|
|
|
if (get_riff(avi, pb) < 0)
|
|
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);
|
|
n = get_le32(pb);
|
|
for(i=0;i<n;i++) {
|
|
st = av_new_stream(s, i);
|
|
if (!st)
|
|
goto fail;
|
|
}
|
|
url_fskip(pb, size - 7 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'h'):
|
|
/* stream header */
|
|
stream_index++;
|
|
tag1 = get_le32(pb);
|
|
handler = get_le32(pb); /* codec tag */
|
|
switch(tag1) {
|
|
case MKTAG('i', 'a', 'v', 's'):
|
|
case MKTAG('i', 'v', 'a', 's'):
|
|
/*
|
|
* After some consideration -- I don't think we
|
|
* have to support anything but DV in a 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;
|
|
|
|
avi->dv_demux = dv_init_demux(s, stream_index, stream_index + 1);
|
|
if (!avi->dv_demux)
|
|
goto fail;
|
|
stream_index++;
|
|
case MKTAG('v', 'i', 'd', 's'):
|
|
codec_type = CODEC_TYPE_VIDEO;
|
|
|
|
if (stream_index >= s->nb_streams) {
|
|
url_fskip(pb, size - 8);
|
|
break;
|
|
}
|
|
|
|
st = s->streams[stream_index];
|
|
|
|
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;
|
|
}
|
|
get_le32(pb); /* start */
|
|
nb_frames = get_le32(pb);
|
|
st->start_time = 0;
|
|
st->duration = (double)nb_frames *
|
|
st->codec.frame_rate_base * AV_TIME_BASE /
|
|
st->codec.frame_rate;
|
|
|
|
url_fskip(pb, size - 9 * 4);
|
|
break;
|
|
case MKTAG('a', 'u', 'd', 's'):
|
|
{
|
|
unsigned int length, rate;
|
|
|
|
codec_type = CODEC_TYPE_AUDIO;
|
|
|
|
if (stream_index >= s->nb_streams) {
|
|
url_fskip(pb, size - 8);
|
|
break;
|
|
}
|
|
st = s->streams[stream_index];
|
|
|
|
get_le32(pb); /* flags */
|
|
get_le16(pb); /* priority */
|
|
get_le16(pb); /* language */
|
|
get_le32(pb); /* initial frame */
|
|
get_le32(pb); /* scale */
|
|
rate = get_le32(pb);
|
|
get_le32(pb); /* start */
|
|
length = get_le32(pb); /* length, in samples or bytes */
|
|
st->start_time = 0;
|
|
if (rate != 0)
|
|
st->duration = (int64_t)length * AV_TIME_BASE / rate;
|
|
url_fskip(pb, size - 9 * 4);
|
|
}
|
|
break;
|
|
default:
|
|
goto fail;
|
|
}
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'f'):
|
|
/* stream header */
|
|
if (stream_index >= s->nb_streams || avi->dv_demux) {
|
|
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);
|
|
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);
|
|
if (st->codec.codec_id == CODEC_ID_XAN_WC4)
|
|
xan_video = 1;
|
|
// 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);
|
|
/* special case time: To support Xan DPCM, hardcode
|
|
* the format if Xxan is the video codec */
|
|
if (xan_video)
|
|
st->codec.codec_id = CODEC_ID_XAN_DPCM;
|
|
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;
|
|
void* dstr;
|
|
|
|
memset(d, -1, sizeof(int)*8);
|
|
|
|
if (avi->dv_demux) {
|
|
size = dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
}
|
|
|
|
for(i=url_ftell(pb); !url_feof(pb); i++) {
|
|
int j;
|
|
|
|
if (i >= avi->movi_end) { /* Let's see if it's an OpenDML AVI */
|
|
uint32_t tag, size, tag2;
|
|
url_fskip(pb, avi->riff_end - url_ftell(pb));
|
|
if (get_riff(avi, pb) < 0)
|
|
return -1;
|
|
|
|
tag = get_le32(pb);
|
|
size = get_le32(pb);
|
|
tag2 = get_le32(pb);
|
|
if (tag == MKTAG('L','I','S','T') && tag2 == MKTAG('m','o','v','i'))
|
|
avi->movi_end = url_ftell(pb) + size - 4;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
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') ||
|
|
(d[2] == '_' && d[3] == '_'))
|
|
&& n < s->nb_streams
|
|
&& i + size <= avi->movi_end) {
|
|
|
|
av_new_packet(pkt, size);
|
|
get_buffer(pb, pkt->data, size);
|
|
if (size & 1) {
|
|
get_byte(pb);
|
|
size++;
|
|
}
|
|
|
|
if (avi->dv_demux) {
|
|
dstr = pkt->destruct;
|
|
size = dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size);
|
|
pkt->destruct = dstr;
|
|
} else {
|
|
pkt->stream_index = n;
|
|
pkt->flags |= PKT_FLAG_KEY; // FIXME: We really should read
|
|
// index for that
|
|
}
|
|
return size;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
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];
|
|
// av_free(st->priv_data);
|
|
av_free(st->codec.extradata);
|
|
}
|
|
|
|
if (avi->dv_demux)
|
|
av_free(avi->dv_demux);
|
|
|
|
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;
|
|
}
|