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https://github.com/xenia-project/FFmpeg.git
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optimizing mpeg1_decode_block()
Originally committed as revision 985 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
8e1652dc9d
commit
a02017367b
@ -52,7 +52,10 @@ static void mpeg1_encode_block(MpegEncContext *s,
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int component);
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static void mpeg1_encode_motion(MpegEncContext *s, int val);
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static void mpeg1_skip_picture(MpegEncContext *s, int pict_num);
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static int mpeg1_decode_block(MpegEncContext *s,
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n);
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static int mpeg2_decode_block_non_intra(MpegEncContext *s,
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@ -92,8 +95,8 @@ static void init_2d_vlc_rl(RLTable *rl)
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run= 65;
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level= 0;
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}else if(code==rl->n+1){ //eob
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run= 192;
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level= 1;
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run= 0;
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level= 127;
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}else{
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run= rl->table_run [code] + 1;
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level= rl->table_level[code];
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@ -932,30 +935,35 @@ static int mpeg_decode_mb(MpegEncContext *s,
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if (s->mpeg2) {
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if (s->mb_intra) {
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for(i=0;i<6;i++) {
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if (cbp & (1 << (5 - i))) {
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if (mpeg2_decode_block_intra(s, block[i], i) < 0)
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return -1;
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} else {
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s->block_last_index[i] = -1;
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}
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if (mpeg2_decode_block_intra(s, block[i], i) < 0)
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return -1;
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}
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} else {
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for(i=0;i<6;i++) {
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if (cbp & (1 << (5 - i))) {
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if (cbp & 32) {
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if (mpeg2_decode_block_non_intra(s, block[i], i) < 0)
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return -1;
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} else {
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s->block_last_index[i] = -1;
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}
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cbp+=cbp;
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}
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}
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} else {
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for(i=0;i<6;i++) {
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if (cbp & (1 << (5 - i))) {
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if (mpeg1_decode_block(s, block[i], i) < 0)
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if (s->mb_intra) {
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for(i=0;i<6;i++) {
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if (mpeg1_decode_block_intra(s, block[i], i) < 0)
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return -1;
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} else {
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s->block_last_index[i] = -1;
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}
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}else{
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for(i=0;i<6;i++) {
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if (cbp & 32) {
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if (mpeg1_decode_block_inter(s, block[i], i) < 0)
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return -1;
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} else {
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s->block_last_index[i] = -1;
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}
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cbp+=cbp;
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}
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}
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}
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@ -1018,78 +1026,155 @@ static inline int decode_dc(MpegEncContext *s, int component)
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return diff;
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}
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static int mpeg1_decode_block(MpegEncContext *s,
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static inline int mpeg1_decode_block_intra(MpegEncContext *s,
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DCTELEM *block,
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int n)
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{
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int level, dc, diff, i, j, run;
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int code, component;
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int component;
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RLTable *rl = &rl_mpeg1;
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UINT8 * const scantable= s->intra_scantable.permutated;
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const UINT16 *quant_matrix= s->intra_matrix;
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const int qscale= s->qscale;
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if (s->mb_intra) {
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/* DC coef */
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component = (n <= 3 ? 0 : n - 4 + 1);
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diff = decode_dc(s, component);
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if (diff >= 0xffff)
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return -1;
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dc = s->last_dc[component];
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dc += diff;
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s->last_dc[component] = dc;
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block[0] = dc;
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dprintf("dc=%d diff=%d\n", dc, diff);
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i = 1;
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} else {
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/* DC coef */
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component = (n <= 3 ? 0 : n - 4 + 1);
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diff = decode_dc(s, component);
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if (diff >= 0xffff)
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return -1;
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dc = s->last_dc[component];
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dc += diff;
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s->last_dc[component] = dc;
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block[0] = dc<<3;
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dprintf("dc=%d diff=%d\n", dc, diff);
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i = 0;
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{
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OPEN_READER(re, &s->gb);
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/* now quantify & encode AC coefs */
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for(;;) {
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UPDATE_CACHE(re, &s->gb);
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GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
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if(level == 127){
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break;
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} else if(level != 0) {
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i += run;
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j = scantable[i];
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level= (level*qscale*quant_matrix[j])>>3;
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level= (level-1)|1;
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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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} else {
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/* escape */
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run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
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UPDATE_CACHE(re, &s->gb);
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level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
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if (level == -128) {
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level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
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} else if (level == 0) {
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level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
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}
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i += run;
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j = scantable[i];
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if(level<0){
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level= -level;
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level= (level*qscale*quant_matrix[j])>>3;
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level= (level-1)|1;
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level= -level;
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}else{
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level= (level*qscale*quant_matrix[j])>>3;
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level= (level-1)|1;
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}
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}
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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 -1;
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}
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block[j] = level;
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}
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CLOSE_READER(re, &s->gb);
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}
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s->block_last_index[n] = i;
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return 0;
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}
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static inline int mpeg1_decode_block_inter(MpegEncContext *s,
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DCTELEM *block,
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int n)
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{
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int level, i, j, run;
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RLTable *rl = &rl_mpeg1;
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UINT8 * const scantable= s->intra_scantable.permutated;
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const UINT16 *quant_matrix= s->inter_matrix;
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const int qscale= s->qscale;
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{
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int v;
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OPEN_READER(re, &s->gb);
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i = 0;
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i = -1;
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/* special case for the first coef. no need to add a second vlc table */
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UPDATE_CACHE(re, &s->gb);
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v= SHOW_UBITS(re, &s->gb, 2);
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if (v & 2) {
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run = 0;
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level = 1 - ((v & 1) << 1);
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SKIP_BITS(re, &s->gb, 2);
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CLOSE_READER(re, &s->gb);
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goto add_coef;
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level= (3*qscale*quant_matrix[0])>>4;
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level= (level-1)|1;
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if(v&1)
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level= -level;
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block[ scantable[0] ] = level;
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i++;
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}
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CLOSE_READER(re, &s->gb);
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}
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/* now quantify & encode AC coefs */
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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 -1;
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}
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if (code == 112) {
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break;
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} else if (code == 111) {
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/* escape */
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run = get_bits(&s->gb, 6);
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level = get_bits(&s->gb, 8);
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level= (level + ((-1)<<7)) ^ ((-1)<<7); //sign extension
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if (level == -128) {
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level = get_bits(&s->gb, 8) - 256;
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} else if (level == 0) {
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level = get_bits(&s->gb, 8);
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{
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OPEN_READER(re, &s->gb);
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/* now quantify & encode AC coefs */
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for(;;) {
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UPDATE_CACHE(re, &s->gb);
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GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
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if(level == 127){
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break;
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} else if(level != 0) {
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i += run;
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j = scantable[i];
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level= ((level*2+1)*qscale*quant_matrix[j])>>4;
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level= (level-1)|1;
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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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} else {
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/* escape */
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run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
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UPDATE_CACHE(re, &s->gb);
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level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8);
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if (level == -128) {
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level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8);
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} else if (level == 0) {
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level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8);
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}
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i += run;
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j = scantable[i];
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if(level<0){
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level= -level;
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level= ((level*2+1)*qscale*quant_matrix[j])>>4;
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level= (level-1)|1;
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level= -level;
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}else{
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level= ((level*2+1)*qscale*quant_matrix[j])>>4;
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level= (level-1)|1;
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}
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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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if (get_bits1(&s->gb))
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level = -level;
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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 -1;
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}
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block[j] = level;
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}
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i += run;
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if (i >= 64)
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return -1;
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add_coef:
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dprintf("%d: run=%d level=%d\n", n, run, level);
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j = scantable[i];
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block[j] = level;
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i++;
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CLOSE_READER(re, &s->gb);
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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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@ -1517,8 +1517,7 @@ static inline void MPV_motion(MpegEncContext *s,
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static inline void put_dct(MpegEncContext *s,
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DCTELEM *block, int i, UINT8 *dest, int line_size)
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{
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if (!s->mpeg2)
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s->dct_unquantize(s, block, i, s->qscale);
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s->dct_unquantize(s, block, i, s->qscale);
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s->idct_put (dest, line_size, block);
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}
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@ -1723,7 +1722,8 @@ 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->encoding || !(s->mpeg2 || s->h263_msmpeg4 || (s->codec_id==CODEC_ID_MPEG4 && !s->mpeg_quant))){
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if(s->encoding || !( s->mpeg2 || s->h263_msmpeg4 || s->codec_id==CODEC_ID_MPEG1VIDEO
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|| (s->codec_id==CODEC_ID_MPEG4 && !s->mpeg_quant))){
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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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@ -1746,14 +1746,26 @@ void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
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}
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} else {
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/* dct only in intra block */
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put_dct(s, block[0], 0, dest_y, dct_linesize);
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put_dct(s, block[1], 1, dest_y + 8, dct_linesize);
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put_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize);
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put_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize);
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if(s->encoding || !(s->mpeg2 || s->codec_id==CODEC_ID_MPEG1VIDEO)){
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put_dct(s, block[0], 0, dest_y, dct_linesize);
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put_dct(s, block[1], 1, dest_y + 8, dct_linesize);
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put_dct(s, block[2], 2, dest_y + dct_offset, dct_linesize);
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put_dct(s, block[3], 3, dest_y + dct_offset + 8, dct_linesize);
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if(!(s->flags&CODEC_FLAG_GRAY)){
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put_dct(s, block[4], 4, dest_cb, s->uvlinesize);
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put_dct(s, block[5], 5, dest_cr, s->uvlinesize);
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if(!(s->flags&CODEC_FLAG_GRAY)){
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put_dct(s, block[4], 4, dest_cb, s->uvlinesize);
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put_dct(s, block[5], 5, dest_cr, s->uvlinesize);
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}
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}else{
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s->idct_put(dest_y , dct_linesize, block[0]);
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s->idct_put(dest_y + 8, dct_linesize, block[1]);
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s->idct_put(dest_y + dct_offset , dct_linesize, block[2]);
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s->idct_put(dest_y + dct_offset + 8, dct_linesize, block[3]);
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if(!(s->flags&CODEC_FLAG_GRAY)){
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s->idct_put(dest_cb, s->uvlinesize, block[4]);
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s->idct_put(dest_cr, s->uvlinesize, block[5]);
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}
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}
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}
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}
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