virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

better cbp handling and small speedup in mpeg12

Browse Source 
Originally committed as revision 3219 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ivan Kalvachev 2004-06-12 16:51:15 +00:00
parent 72bd81008e
commit 715731a32b
2 changed files with 29 additions and 87 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
libavcodec/mpeg12.c
View File

@ -1038,6 +1038,7 @@ 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);
@ -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) ){

73
libavcodec/xvmcvideo.c
View File

@ -55,71 +55,21 @@ xvmc_render_state_t * render;
void XVMC_pack_pblocks(MpegEncContext *s, int cbp){
int i,j;
const int mb_block_count = 4+(1<<s->chroma_format);
j=0;
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)) {
s->pblocks[i] = (short *)(&s->block[(j++)]);
}else{
s->pblocks[i] = NULL;
}
cbp+=cbp;
// printf("s->pblocks[%d]=%p ,s->block=%p cbp=%d\n",i,s->pblocks[i],s->block,cbp);
}
if (s->chroma_format >= 2){
if (s->chroma_format == 2){//CHROMA_422
for(i=6;i<8;i++){
if(cbp & (1<<(6+7-i)) ){
s->pblocks[i] = (short *)(&s->block[(j++)]);
}else{
s->pblocks[i] = NULL;
}
}
}else{//CHROMA_444
for(i=6; i<12; i++){
if(cbp & (1<<(6+11-i)) ){
s->pblocks[i] = (short *)(&s->block[(j++)]);
}else{
s->pblocks[i] = NULL;
}
}
}
}
}
static int calc_cbp(MpegEncContext *s){
/* compute cbp */
int i,cbp = 0;
for(i=0; i<4; i++) {
if(s->block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
}
if(s->flags & CODEC_FLAG_GRAY)
return cbp; //4 block for grayscale one done
for(i=4; i<6; i++) {
if(s->block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
}
if(s->chroma_format < 2) return cbp;
if(s->chroma_format == 2){/*CHROMA_422*/
for(i=6; i<8; i++) {
if(s->block_last_index[i] >= 0)
cbp |= 1 << (6+7 - i);
}
}else{/*CHROMA_444*/
for(i=6; i<12; i++) {
if(s->block_last_index[i] >= 0)
cbp |= 1 << (6+11 - i);
}
}
return cbp;
}
//these functions should be called on every new field or/and frame
//They should be safe if they are called few times for same field!
int XVMC_field_start(MpegEncContext*s, AVCodecContext *avctx){
@ -301,6 +251,14 @@ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
blocks_per_mb = 4 + (1 << (s->chroma_format));
}
// calculate cbp
cbp = 0;
for(i=0; i<blocks_per_mb; i++) {
cbp+= cbp;
if(s->block_last_index[i] >= 0)
cbp++;
}
if(s->flags & CODEC_FLAG_GRAY){
if(s->mb_intra){//intra frames are alwasy full chroma block
for(i=4; i<blocks_per_mb; i++){
@ -308,10 +266,11 @@ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
if(!render->unsigned_intra)
s->pblocks[i][0] = 1<<10;
}
}else
}else{
cbp&= 0xf << (blocks_per_mb - 4);
blocks_per_mb = 4;//Luminance blocks only
}
}
cbp = calc_cbp(s);
mv_block->coded_block_pattern = cbp;
if(cbp == 0)
mv_block->macroblock_type &= ~XVMC_MB_TYPE_PATTERN;