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rl decoding optimization
Originally committed as revision 755 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
e3e98d3c23
commit
c03a717274
@ -1704,10 +1704,10 @@ void h263_decode_init_vlc(MpegEncContext *s)
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init_vlc_rl(&rl_inter);
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init_vlc_rl(&rl_intra);
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init_vlc_rl(&rl_intra_aic);
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init_vlc(&dc_lum, DC_VLC_BITS, 9 /* 13 */,
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init_vlc(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
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&DCtab_lum[0][1], 2, 1,
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&DCtab_lum[0][0], 2, 1);
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init_vlc(&dc_chrom, DC_VLC_BITS, 9 /* 13 */,
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init_vlc(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
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&DCtab_chrom[0][1], 2, 1,
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&DCtab_chrom[0][0], 2, 1);
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init_vlc(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
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@ -2917,10 +2917,12 @@ static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
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static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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int n, int coded)
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{
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int code, level, i, j, last, run;
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int level, i, last, run;
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int dc_pred_dir;
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RLTable *rl;
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RL_VLC_ELEM *rl_vlc;
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const UINT8 *scan_table;
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int qmul, qadd;
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if (s->mb_intra) {
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/* DC coef */
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@ -2935,10 +2937,11 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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return DECODING_ACDC_LOST;
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}
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block[0] = level;
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i = 1;
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i = 0;
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if (!coded)
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goto not_coded;
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rl = &rl_intra;
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rl_vlc = rl_intra.rl_vlc[0];
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if (s->ac_pred) {
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if (dc_pred_dir == 0)
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scan_table = ff_alternate_vertical_scan; /* left */
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@ -2947,37 +2950,52 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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} else {
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scan_table = zigzag_direct;
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}
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qmul=1;
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qadd=0;
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} else {
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i = 0;
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i = -1;
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if (!coded) {
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s->block_last_index[n] = i - 1;
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s->block_last_index[n] = i;
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return 0;
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}
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rl = &rl_inter;
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rl_vlc = rl_inter.rl_vlc[s->qscale];
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scan_table = zigzag_direct;
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qmul = s->qscale << 1;
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qadd = (s->qscale - 1) | 1;
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}
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{
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OPEN_READER(re, &s->gb);
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for(;;) {
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code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
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if (code < 0)
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return DECODING_AC_LOST;
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if (code == rl->n) {
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UPDATE_CACHE(re, &s->gb);
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GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
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if (level==0) {
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int cache;
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cache= GET_CACHE(re, &s->gb);
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/* escape */
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if (get_bits1(&s->gb) != 0) {
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if (get_bits1(&s->gb) != 0) {
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if (cache&0x80000000) {
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if (cache&0x40000000) {
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/* third escape */
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last = get_bits1(&s->gb);
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run = get_bits(&s->gb, 6);
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if(get_bits1(&s->gb)==0){
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SKIP_CACHE(re, &s->gb, 2);
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last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
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run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
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SKIP_COUNTER(re, &s->gb, 2+1+6);
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UPDATE_CACHE(re, &s->gb);
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if(SHOW_UBITS(re, &s->gb, 1)==0){
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fprintf(stderr, "1. marker bit missing in 3. esc\n");
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return DECODING_AC_LOST;
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}
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level = get_bits(&s->gb, 12);
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level = (level << 20) >> 20; /* sign extend */
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if(get_bits1(&s->gb)==0){
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}; SKIP_CACHE(re, &s->gb, 1);
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level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
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if(SHOW_UBITS(re, &s->gb, 1)==0){
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fprintf(stderr, "2. marker bit missing in 3. esc\n");
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return DECODING_AC_LOST;
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}
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}; LAST_SKIP_CACHE(re, &s->gb, 1);
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SKIP_COUNTER(re, &s->gb, 1+12+1);
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if(level>512 || level<-512){ //FIXME check that QP=1 is ok with this too
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fprintf(stderr, "|level| overflow in 3. esc\n");
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return DECODING_AC_LOST;
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@ -3002,54 +3020,66 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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}
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}
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#endif
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if (level>0) level= level * qmul + qadd;
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else level= level * qmul - qadd;
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i+= run + 1;
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if(last) i+=192;
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} else {
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/* second escape */
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code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
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if (code < 0 || code >= rl->n)
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return DECODING_AC_LOST;
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run = rl->table_run[code];
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level = rl->table_level[code];
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last = code >= rl->last;
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run += rl->max_run[last][level] + 1;
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if (get_bits1(&s->gb))
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level = -level;
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#if MIN_CACHE_BITS < 20
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LAST_SKIP_BITS(re, &s->gb, 2);
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UPDATE_CACHE(re, &s->gb);
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#else
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SKIP_BITS(re, &s->gb, 2);
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#endif
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GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
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i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
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level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
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LAST_SKIP_BITS(re, &s->gb, 1);
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}
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} else {
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/* first escape */
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code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
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if (code < 0 || code >= rl->n)
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return DECODING_AC_LOST;
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run = rl->table_run[code];
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level = rl->table_level[code];
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last = code >= rl->last;
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level += rl->max_level[last][run];
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if (get_bits1(&s->gb))
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level = -level;
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#if MIN_CACHE_BITS < 19
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LAST_SKIP_BITS(re, &s->gb, 1);
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UPDATE_CACHE(re, &s->gb);
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#else
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SKIP_BITS(re, &s->gb, 1);
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#endif
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GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2);
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i+= run;
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level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
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level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
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LAST_SKIP_BITS(re, &s->gb, 1);
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}
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} else {
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run = rl->table_run[code];
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level = rl->table_level[code];
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last = code >= rl->last;
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if (get_bits1(&s->gb))
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level = -level;
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i+= run;
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level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
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LAST_SKIP_BITS(re, &s->gb, 1);
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}
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i += run;
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if (i >= 64)
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return DECODING_AC_LOST;
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j = scan_table[i];
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block[j] = level;
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i++;
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if (last)
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if (i > 62){
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i-= 192;
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if(i&(~63)){
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fprintf(stderr, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
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return DECODING_AC_LOST;
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}
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block[scan_table[i]] = level;
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break;
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}
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block[scan_table[i]] = level;
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}
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CLOSE_READER(re, &s->gb);
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}
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not_coded:
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if (s->mb_intra) {
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mpeg4_pred_ac(s, block, n, dc_pred_dir);
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if (s->ac_pred) {
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i = 64; /* XXX: not optimal */
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i = 63; /* XXX: not optimal */
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}
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}
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s->block_last_index[n] = i - 1;
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s->block_last_index[n] = i;
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return 0;
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}
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@ -1318,7 +1318,7 @@ void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
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if(s->hurry_up>1) goto the_end;
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/* add dct residue */
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if(!s->mpeg2 && (s->encoding || (!s->h263_msmpeg4))){
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if(s->encoding || !(s->mpeg2 || s->h263_msmpeg4 || s->codec_id==CODEC_ID_MPEG4)){
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add_dequant_dct(s, block[0], 0, dest_y, dct_linesize);
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add_dequant_dct(s, block[1], 1, dest_y + 8, dct_linesize);
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add_dequant_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize);
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