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ffmpeg.wasm-core
Commit b53f1064 authored by Michael Niedermayer's avatar Michael Niedermayer
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cleanup strh parser 

Originally committed as revision 4041 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent f9e6ebf7
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Showing with 45 additions and 76 deletions
libavformat/avidec.c
View file @ b53f1064
......@@ -90,7 +90,7 @@ 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;
int codec_type, stream_index, frame_period, bit_rate;
unsigned int size, nb_frames;
int i, n;
AVStream *st;
......@@ -164,9 +164,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
#ifdef DEBUG
print_tag("strh", tag1, -1);
#endif
switch(tag1) {
case MKTAG('i', 'a', 'v', 's'):
case MKTAG('i', 'v', 'a', 's'):
if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
/*
* After some consideration -- I don't think we
* have to support anything but DV in a type1 AVIs.
......@@ -192,96 +190,67 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
ast->rate = get_le32(pb);
stream_index = s->nb_streams - 1;
url_fskip(pb, size - 7*4);
break;
break;
}
if (stream_index >= s->nb_streams) {
url_fskip(pb, size - 8);
break;
}
st = s->streams[stream_index];
ast = st->priv_data;
st->codec.stream_codec_tag= handler;
get_le32(pb); /* flags */
get_le16(pb); /* priority */
get_le16(pb); /* language */
get_le32(pb); /* initial frame */
ast->scale = get_le32(pb);
ast->rate = get_le32(pb);
if(ast->scale && ast->rate){
}else if(frame_period){
ast->rate = 1000000;
ast->scale = frame_period;
}else{
ast->rate = 25;
ast->scale = 1;
}
av_set_pts_info(st, 64, ast->scale, ast->rate);
ast->start= get_le32(pb); /* start */
nb_frames = get_le32(pb);
st->start_time = 0;
st->duration = av_rescale(nb_frames, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
get_le32(pb); /* buffer size */
get_le32(pb); /* quality */
ast->sample_size = get_le32(pb); /* sample ssize */
// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
switch(tag1) {
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];
ast = st->priv_data;
st->codec.stream_codec_tag= handler;
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){
}else if(frame_period){
rate = 1000000;
scale = frame_period;
}else{
rate = 25;
scale = 1;
}
ast->rate = rate;
ast->scale = scale;
av_set_pts_info(st, 64, scale, rate);
st->codec.frame_rate = rate;
st->codec.frame_rate_base = scale;
get_le32(pb); /* start */
nb_frames = get_le32(pb);
st->start_time = 0;
st->duration = av_rescale(nb_frames,
st->codec.frame_rate_base * (int64_t)AV_TIME_BASE,
st->codec.frame_rate);
url_fskip(pb, size - 9 * 4);
ast->sample_size = 0;
st->codec.frame_rate = ast->rate;
st->codec.frame_rate_base = ast->scale;
break;
case MKTAG('a', 'u', 'd', 's'):
{
unsigned int length;
codec_type = CODEC_TYPE_AUDIO;
if (stream_index >= s->nb_streams) {
url_fskip(pb, size - 8);
break;
}
st = s->streams[stream_index];
ast = st->priv_data;
get_le32(pb); /* flags */
get_le16(pb); /* priority */
get_le16(pb); /* language */
get_le32(pb); /* initial frame */
ast->scale = get_le32(pb); /* scale */
ast->rate = get_le32(pb);
if(!ast->rate)
ast->rate= 1; //wrong but better then 1/0
if(!ast->scale)
ast->scale= 1; //wrong but better then 1/0
av_set_pts_info(st, 64, ast->scale, ast->rate);
ast->start= get_le32(pb); /* start */
length = get_le32(pb); /* length, in samples or bytes */
get_le32(pb); /* buffer size */
get_le32(pb); /* quality */
ast->sample_size = get_le32(pb); /* sample ssize */
//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->scale, ast->rate, ast->sample_size, ast->start);
st->start_time = 0;
st->duration = av_rescale(length, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
url_fskip(pb, size - 12 * 4);
}
codec_type = CODEC_TYPE_AUDIO;
break;
case MKTAG('t', 'x', 't', 's'):
//FIXME
codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
url_fskip(pb, size - 8);
break;
case MKTAG('p', 'a', 'd', 's'):
codec_type = CODEC_TYPE_UNKNOWN;
url_fskip(pb, size - 8);
stream_index--;
break;
default:
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
goto fail;
}
url_fskip(pb, size - 12 * 4);
break;
case MKTAG('s', 't', 'r', 'f'):
/* stream header */
......
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