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mpeg1dec: More complete sofdec support

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Fixes Ticket517

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-10-06 12:09:33 +02:00
parent 1b3b4a575b
commit 5bebb6e64b
1 changed files with 19 additions and 0 deletions
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19
libavcodec/mpeg12.c
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@ -1128,6 +1128,7 @@ typedef struct Mpeg1Context {
int save_width, save_height, save_progressive_seq;
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
int tmpgexs;
} Mpeg1Context;
static av_cold int mpeg_decode_init(AVCodecContext *avctx)
@ -2122,8 +2123,22 @@ static int vcr2_init_sequence(AVCodecContext *avctx)
static void mpeg_decode_user_data(AVCodecContext *avctx,
const uint8_t *p, int buf_size)
{
Mpeg1Context *s = avctx->priv_data;
const uint8_t *buf_end = p + buf_size;
if(buf_size > 29){
int i;
for(i=0; i<20; i++)
if(!memcmp(p+i, "\0TMPGEXS\0", 9)){
s->tmpgexs= 1;
}
/* for(i=0; !(!p[i-2] && !p[i-1] && p[i]==1) && i<buf_size; i++){
av_log(0,0, "%c", p[i]);
}
av_log(0,0, "\n");*/
}
/* we parse the DTG active format information */
if (buf_end - p >= 5 &&
p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') {
@ -2341,6 +2356,10 @@ static int decode_chunks(AVCodecContext *avctx,
break;
case PICTURE_START_CODE:
if(s->tmpgexs){
s2->intra_dc_precision= 3;
s2->intra_matrix[0]= 1;
}
if (HAVE_THREADS && (avctx->active_thread_type & FF_THREAD_SLICE) && s->slice_count) {
int i;