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authorIvan Kalvachev <ikalvachev@gmail.com>2004-06-12 16:51:15 +0000
committerIvan Kalvachev <ikalvachev@gmail.com>2004-06-12 16:51:15 +0000
commit715731a32b461cd819d08c206bafc4e415ae504a (patch)
tree6f0303c1c0eb91cab29040a94bd55902a73d828d /libavcodec/mpeg12.c
parent72bd81008e8c12f59c43cd5ed87afc95ab170807 (diff)
downloadffmpeg-715731a32b461cd819d08c206bafc4e415ae504a.tar.gz
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.c43
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) ){