mirror of https://git.ffmpeg.org/ffmpeg.git
13% faster decode_residual (cavlc).
patch by diane_cartman at gmx dot de. Originally committed as revision 4617 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -4437,8 +4437,8 @@ static inline int get_dct8x8_allowed(H264Context *h){
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static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, int n, const uint8_t *scantable, const uint16_t *qmul, int max_coeff){
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MpegEncContext * const s = &h->s;
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static const int coeff_token_table_index[17]= {0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3};
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int level[16], run[16];
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int suffix_length, zeros_left, coeff_num, coeff_token, total_coeff, i, trailing_ones;
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int level[16];
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int zeros_left, coeff_num, coeff_token, total_coeff, i, j, trailing_ones, run_before;
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//FIXME put trailing_onex into the context
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@ -4471,12 +4471,12 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
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level[i]= 1 - 2*get_bits1(gb);
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}
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suffix_length= total_coeff > 10 && trailing_ones < 3;
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for(; i<total_coeff; i++){
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const int prefix= get_level_prefix(gb);
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if(i<total_coeff) {
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int level_code, mask;
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int suffix_length = total_coeff > 10 && trailing_ones < 3;
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int prefix= get_level_prefix(gb);
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//first coefficient has suffix_length equal to 0 or 1
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if(prefix<14){ //FIXME try to build a large unified VLC table for all this
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if(suffix_length)
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level_code= (prefix<<suffix_length) + get_bits(gb, suffix_length); //part
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@ -4495,20 +4495,32 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
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return -1;
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}
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if(i==trailing_ones && i<3) level_code+= 2; //FIXME split first iteration
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if(trailing_ones < 3) level_code += 2;
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suffix_length = 1;
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if(level_code > 5)
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suffix_length++;
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mask= -(level_code&1);
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level[i]= (((2+level_code)>>1) ^ mask) - mask;
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i++;
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if(suffix_length==0) suffix_length=1; //FIXME split first iteration
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#if 1
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if(ABS(level[i]) > (3<<(suffix_length-1)) && suffix_length<6) suffix_length++;
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#else
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if((2+level_code)>>1) > (3<<(suffix_length-1)) && suffix_length<6) suffix_length++;
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/* ? == prefix > 2 or sth */
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#endif
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tprintf("level: %d suffix_length:%d\n", level[i], suffix_length);
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//remaining coefficients have suffix_length > 0
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for(;i<total_coeff;i++) {
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static const int suffix_limit[7] = {0,5,11,23,47,95,INT_MAX };
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prefix = get_level_prefix(gb);
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if(prefix<15){
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level_code = (prefix<<suffix_length) + get_bits(gb, suffix_length);
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}else if(prefix==15){
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level_code = (prefix<<suffix_length) + get_bits(gb, 12);
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}else{
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av_log(h->s.avctx, AV_LOG_ERROR, "prefix too large at %d %d\n", s->mb_x, s->mb_y);
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return -1;
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}
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mask= -(level_code&1);
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level[i]= (((2+level_code)>>1) ^ mask) - mask;
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if(level_code > suffix_limit[suffix_length])
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suffix_length++;
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}
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}
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if(total_coeff == max_coeff)
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@ -4520,15 +4532,41 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
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zeros_left= get_vlc2(gb, total_zeros_vlc[ total_coeff-1 ].table, TOTAL_ZEROS_VLC_BITS, 1);
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}
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for(i=0; i<total_coeff-1; i++){
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coeff_num = zeros_left + total_coeff - 1;
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j = scantable[coeff_num];
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if(n > 24){
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block[j] = level[0];
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for(i=1;i<total_coeff;i++) {
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if(zeros_left <= 0)
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break;
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run_before = 0;
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else if(zeros_left < 7){
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run[i]= get_vlc2(gb, run_vlc[zeros_left-1].table, RUN_VLC_BITS, 1);
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run_before= get_vlc2(gb, run_vlc[zeros_left-1].table, RUN_VLC_BITS, 1);
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}else{
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run[i]= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2);
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run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2);
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}
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zeros_left -= run_before;
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coeff_num -= 1 + run_before;
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j= scantable[ coeff_num ];
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block[j]= level[i];
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}
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}else{
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block[j] = level[0] * qmul[j];
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for(i=1;i<total_coeff;i++) {
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if(zeros_left <= 0)
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run_before = 0;
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else if(zeros_left < 7){
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run_before= get_vlc2(gb, run_vlc[zeros_left-1].table, RUN_VLC_BITS, 1);
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}else{
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run_before= get_vlc2(gb, run7_vlc.table, RUN7_VLC_BITS, 2);
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}
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zeros_left -= run_before;
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coeff_num -= 1 + run_before;
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j= scantable[ coeff_num ];
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block[j]= level[i] * qmul[j];
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// printf("%d %d ", block[j], qmul[j]);
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}
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zeros_left -= run[i];
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}
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if(zeros_left<0){
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@ -4536,33 +4574,6 @@ static int decode_residual(H264Context *h, GetBitContext *gb, DCTELEM *block, in
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return -1;
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}
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for(; i<total_coeff-1; i++){
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run[i]= 0;
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}
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run[i]= zeros_left;
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coeff_num=-1;
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if(n > 24){
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for(i=total_coeff-1; i>=0; i--){ //FIXME merge into rundecode?
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int j;
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coeff_num += run[i] + 1; //FIXME add 1 earlier ?
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j= scantable[ coeff_num ];
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block[j]= level[i];
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}
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}else{
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for(i=total_coeff-1; i>=0; i--){ //FIXME merge into rundecode?
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int j;
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coeff_num += run[i] + 1; //FIXME add 1 earlier ?
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j= scantable[ coeff_num ];
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block[j]= level[i] * qmul[j];
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// printf("%d %d ", block[j], qmul[j]);
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}
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}
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return 0;
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}
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