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use pan_scan to remove some weight, proper pan_scan offset reading

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Originally committed as revision 2898 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ivan Kalvachev 2004-03-16 15:38:40 +00:00
parent 5ac4768362
commit 6fe1a1a55b
1 changed files with 19 additions and 11 deletions
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30
libavcodec/mpeg12.c
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@ -1750,8 +1750,6 @@ typedef struct Mpeg1Context {
MpegEncContext mpeg_enc_ctx;
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
int repeat_field; /* true if we must repeat the field */
int display_weight;
int display_height;
AVPanScan pan_scan; /** some temporary storage for the panscan */
int slice_count;
int swap_uv;//indicate VCR2
@ -1838,7 +1836,7 @@ uint8_t old_permutation[64];
1<<30);
//mpeg2 aspect
if(s->aspect_ratio_info > 1){
if( (s1->display_weight == 0 )||(s1->display_height == 0) ){
if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){
s->avctx->sample_aspect_ratio=
av_div_q(
mpeg2_aspect[s->aspect_ratio_info],
@ -1848,7 +1846,7 @@ uint8_t old_permutation[64];
s->avctx->sample_aspect_ratio=
av_div_q(
mpeg2_aspect[s->aspect_ratio_info],
(AVRational){s1->display_weight, s1->display_height}
(AVRational){s1->pan_scan.width, s1->pan_scan.height}
);
}
}else{
@ -2018,11 +2016,7 @@ static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
s1->pan_scan.width= 16*w;
s1->pan_scan.height=16*h;
s1->display_weight = w;
s1->display_height = h;
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%d\n", w, h);
}
@ -2030,9 +2024,23 @@ static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
static void mpeg_decode_picture_display_extension(Mpeg1Context *s1)
{
MpegEncContext *s= &s1->mpeg_enc_ctx;
int i;
int i,nofco;
for(i=0; i<1; i++){ //FIXME count
nofco = 1;
if(s->progressive_sequence){
if(s->repeat_first_field){
nofco++;
if(s->top_field_first)
nofco++;
}
}else{
if(s->picture_structure == PICT_FRAME){
nofco++;
if(s->repeat_first_field)
nofco++;
}
}
for(i=0; i<nofco; i++){
s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16);
skip_bits(&s->gb, 1); //marker
s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16);