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| author | Ivan Kalvachev <ikalvachev@gmail.com> | 2004-06-12 16:51:15 +0000 |
|---|---|---|
| committer | Ivan Kalvachev <ikalvachev@gmail.com> | 2004-06-12 16:51:15 +0000 |
| commit | 715731a32b461cd819d08c206bafc4e415ae504a (patch) | |
| tree | 6f0303c1c0eb91cab29040a94bd55902a73d828d /libavcodec/mpeg12.c | |
| parent | 72bd81008e8c12f59c43cd5ed87afc95ab170807 (diff) | |
better cbp handling and small speedup in mpeg12
Originally committed as revision 3219 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpeg12.c')
| -rw-r--r-- | libavcodec/mpeg12.c | 43 |
1 files changed, 13 insertions, 30 deletions
diff --git a/libavcodec/mpeg12.c b/libavcodec/mpeg12.c index f187783140..15c51096d3 100644 --- a/libavcodec/mpeg12.c +++ b/libavcodec/mpeg12.c @@ -1038,7 +1038,8 @@ static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64]) { int i, j, k, cbp, val, mb_type, motion_type; - + const int mb_block_count = 4 + (1<< s->chroma_format) + dprintf("decode_mb: x=%d y=%d\n", s->mb_x, s->mb_y); assert(s->mb_skiped==0); @@ -1151,7 +1152,7 @@ static int mpeg_decode_mb(MpegEncContext *s, #endif if (s->codec_id == CODEC_ID_MPEG2VIDEO) { - for(i=0;i<4+(1<<s->chroma_format);i++) { + for(i=0;i<mb_block_count;i++) { if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0) return -1; } @@ -1335,11 +1336,9 @@ static int mpeg_decode_mb(MpegEncContext *s, av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %d\n", s->mb_x, s->mb_y); return -1; } - if(s->chroma_format == 2){//CHROMA422 - cbp|= ( get_bits(&s->gb,2) ) << 6; - }else - if(s->chroma_format > 2){//CHROMA444 - cbp|= ( get_bits(&s->gb,6) ) << 6; + if(mb_block_count > 6){ + cbp<<= mb_block_count-6; + cbp |= get_bits(&s->gb, mb_block_count-6); } #ifdef HAVE_XVMC @@ -1353,34 +1352,16 @@ static int mpeg_decode_mb(MpegEncContext *s, #endif if (s->codec_id == CODEC_ID_MPEG2VIDEO) { - for(i=0;i<6;i++) { - if (cbp & (1<<(5-i)) ) { + cbp<<= 12-mb_block_count; + + for(i=0;i<mb_block_count;i++) { + if ( cbp & (1<<11) ) { if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0) return -1; } else { s->block_last_index[i] = -1; } - } - if (s->chroma_format >= 2) { - if (s->chroma_format == 2) {//CHROMA_422) - for(i=6;i<8;i++) { - if (cbp & (1<<(6+7-i)) ) { - if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0) - return -1; - } else { - s->block_last_index[i] = -1; - } - } - }else{ /*CHROMA_444*/ - for(i=6;i<12;i++) { - if (cbp & (1<<(6+11-i)) ) { - if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0) - return -1; - } else { - s->block_last_index[i] = -1; - } - } - } + cbp+=cbp; } } else { for(i=0;i<6;i++) { @@ -3013,6 +2994,8 @@ AVCodec mpeg2video_encoder = { static int mpeg_mc_decode_init(AVCodecContext *avctx){ Mpeg1Context *s; + if( avctx->thread_count > 1) + return -1; if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) ) return -1; if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){ |