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drop b frames if there are no reference frames

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skip b frames if hurry_up

Originally committed as revision 1312 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-12-05 11:33:43 +00:00
parent 34b10a5791
commit d9cb5429f2
1 changed files with 9 additions and 1 deletions
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10
libavcodec/mpeg12.c
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@ -1421,6 +1421,7 @@ static int mpeg1_decode_picture(AVCodecContext *avctx,
} }
s->current_picture.pict_type= s->pict_type; s->current_picture.pict_type= s->pict_type;
s->current_picture.key_frame= s->pict_type == I_TYPE; s->current_picture.key_frame= s->pict_type == I_TYPE;
s->y_dc_scale = 8; s->y_dc_scale = 8;
s->c_dc_scale = 8; s->c_dc_scale = 8;
s->first_slice = 1; s->first_slice = 1;
@ -1895,8 +1896,15 @@ static int mpeg_decode_frame(AVCodecContext *avctx,
s->buffer, input_size); s->buffer, input_size);
break; break;
default: default:
/* skip b frames if we dont have reference frames */
if(s2->last_picture.data[0]==NULL && s2->pict_type==B_TYPE) break;
/* skip b frames if we are in a hurry */
if(avctx->hurry_up && s2->pict_type==B_TYPE) break;
/* skip everything if we are in a hurry>=5 */
if(avctx->hurry_up>=5) break;
if (start_code >= SLICE_MIN_START_CODE && if (start_code >= SLICE_MIN_START_CODE &&
start_code <= SLICE_MAX_START_CODE && avctx->hurry_up<5) { start_code <= SLICE_MAX_START_CODE) {
ret = mpeg_decode_slice(avctx, picture, ret = mpeg_decode_slice(avctx, picture,
start_code, s->buffer, input_size); start_code, s->buffer, input_size);
if (ret == DECODE_SLICE_EOP) { if (ret == DECODE_SLICE_EOP) {