generic-library/ffmpeg
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optimization (get_vlc -> get_vlc2)

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Originally committed as revision 750 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-07-13 15:45:52 +00:00
parent 71529954c6
commit edcf989073
1 changed files with 34 additions and 25 deletions
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59
libavcodec/h263.c
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@ -35,6 +35,15 @@
#define PRINT_MB_TYPE(a) {}
//#define PRINT_MB_TYPE(a) printf(a)
#define INTRA_MCBPC_VLC_BITS 6
#define INTER_MCBPC_VLC_BITS 6
#define CBPY_VLC_BITS 6
#define MV_VLC_BITS 9
#define DC_VLC_BITS 9
#define SPRITE_TRAJ_VLC_BITS 6
#define MB_TYPE_B_VLC_BITS 4
#define TEX_VLC_BITS 9
static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
int n);
static void h263_encode_motion(MpegEncContext * s, int val, int fcode);
@ -1677,16 +1686,16 @@ void h263_decode_init_vlc(MpegEncContext *s)
if (!done) {
done = 1;
init_vlc(&intra_MCBPC_vlc, 6, 8,
init_vlc(&intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 8,
intra_MCBPC_bits, 1, 1,
intra_MCBPC_code, 1, 1);
init_vlc(&inter_MCBPC_vlc, 9, 25,
init_vlc(&inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 25,
inter_MCBPC_bits, 1, 1,
inter_MCBPC_code, 1, 1);
init_vlc(&cbpy_vlc, 6, 16,
init_vlc(&cbpy_vlc, CBPY_VLC_BITS, 16,
&cbpy_tab[0][1], 2, 1,
&cbpy_tab[0][0], 2, 1);
init_vlc(&mv_vlc, 9, 33,
init_vlc(&mv_vlc, MV_VLC_BITS, 33,
&mvtab[0][1], 2, 1,
&mvtab[0][0], 2, 1);
init_rl(&rl_inter);
@ -1695,16 +1704,16 @@ void h263_decode_init_vlc(MpegEncContext *s)
init_vlc_rl(&rl_inter);
init_vlc_rl(&rl_intra);
init_vlc_rl(&rl_intra_aic);
init_vlc(&dc_lum, 9, 13,
init_vlc(&dc_lum, DC_VLC_BITS, 9 /* 13 */,
&DCtab_lum[0][1], 2, 1,
&DCtab_lum[0][0], 2, 1);
init_vlc(&dc_chrom, 9, 13,
init_vlc(&dc_chrom, DC_VLC_BITS, 9 /* 13 */,
&DCtab_chrom[0][1], 2, 1,
&DCtab_chrom[0][0], 2, 1);
init_vlc(&sprite_trajectory, 9, 15,
init_vlc(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
&sprite_trajectory_tab[0][1], 4, 2,
&sprite_trajectory_tab[0][0], 4, 2);
init_vlc(&mb_type_b_vlc, 4, 4,
init_vlc(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
&mb_type_b_tab[0][1], 2, 1,
&mb_type_b_tab[0][0], 2, 1);
}
@ -2024,7 +2033,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
int i;
PRINT_MB_TYPE("I");
cbpc = get_vlc(&s->gb, &intra_MCBPC_vlc);
cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
if (cbpc < 0){
fprintf(stderr, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return DECODING_DESYNC;
@ -2089,7 +2098,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
continue;
}
cbpc = get_vlc(&s->gb, &inter_MCBPC_vlc);
cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
if (cbpc < 0){
fprintf(stderr, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
return DECODING_DESYNC;
@ -2196,7 +2205,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
if(s->pict_type==I_TYPE){
int ac_pred= get_bits1(&s->gb);
int cbpy = get_vlc(&s->gb, &cbpy_vlc);
int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
fprintf(stderr, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
return DECODING_AC_LOST;
@ -2208,7 +2217,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
if(s->mb_type[xy]&MB_TYPE_INTRA){
int dir=0,i;
int ac_pred = get_bits1(&s->gb);
int cbpy = get_vlc(&s->gb, &cbpy_vlc);
int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
fprintf(stderr, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
@ -2242,7 +2251,7 @@ int ff_mpeg4_decode_partitions(MpegEncContext *s)
s->qscale_table[xy]= s->qscale;
s->cbp_table[xy]= 0;
}else{
int cbpy = get_vlc(&s->gb, &cbpy_vlc);
int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0){
fprintf(stderr, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
@ -2443,7 +2452,7 @@ int h263_decode_mb(MpegEncContext *s,
}
return 0;
}
cbpc = get_vlc(&s->gb, &inter_MCBPC_vlc);
cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
//fprintf(stderr, "\tCBPC: %d", cbpc);
if (cbpc < 0)
return -1;
@ -2459,7 +2468,7 @@ int h263_decode_mb(MpegEncContext *s,
if(s->pict_type==S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
s->mcsel= get_bits1(&s->gb);
else s->mcsel= 0;
cbpy = get_vlc(&s->gb, &cbpy_vlc);
cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
cbp = (cbpc & 3) | ((cbpy ^ 0xf) << 2);
if (dquant) {
s->qscale += quant_tab[get_bits(&s->gb, 2)];
@ -2586,7 +2595,7 @@ int h263_decode_mb(MpegEncContext *s,
modb1= get_bits1(&s->gb);
if(modb1==0){
modb2= get_bits1(&s->gb);
mb_type= get_vlc(&s->gb, &mb_type_b_vlc);
mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
if(modb2==0) cbp= get_bits(&s->gb, 6);
else cbp=0;
if (mb_type && cbp) {
@ -2664,7 +2673,7 @@ int h263_decode_mb(MpegEncContext *s,
return -1;
}
} else { /* I-Frame */
cbpc = get_vlc(&s->gb, &intra_MCBPC_vlc);
cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 1);
if (cbpc < 0)
return -1;
dquant = cbpc & 4;
@ -2677,7 +2686,7 @@ intra:
if (s->ac_pred && s->h263_aic)
s->h263_aic_dir = get_bits1(&s->gb);
}
cbpy = get_vlc(&s->gb, &cbpy_vlc);
cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
if(cbpy<0) return -1;
cbp = (cbpc & 3) | (cbpy << 2);
if (dquant) {
@ -2709,7 +2718,7 @@ static int h263_decode_motion(MpegEncContext * s, int pred, int f_code)
{
int code, val, sign, shift, l, m;
code = get_vlc(&s->gb, &mv_vlc);
code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
if (code < 0)
return 0xffff;
@ -2822,7 +2831,7 @@ static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
}
for(;;) {
code = get_vlc(&s->gb, &rl->vlc);
code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0)
return -1;
if (code == rl->n) {
@ -2866,9 +2875,9 @@ static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
UINT16 *dc_val;
if (n < 4)
code = get_vlc(&s->gb, &dc_lum);
code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
else
code = get_vlc(&s->gb, &dc_chrom);
code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
if (code < 0 || code > 9 /* && s->nbit<9 */){
fprintf(stderr, "illegal dc vlc\n");
return -1;
@ -2949,7 +2958,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
}
for(;;) {
code = get_vlc(&s->gb, &rl->vlc);
code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0)
return DECODING_AC_LOST;
if (code == rl->n) {
@ -2995,7 +3004,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
#endif
} else {
/* second escape */
code = get_vlc(&s->gb, &rl->vlc);
code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0 || code >= rl->n)
return DECODING_AC_LOST;
run = rl->table_run[code];
@ -3007,7 +3016,7 @@ static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
}
} else {
/* first escape */
code = get_vlc(&s->gb, &rl->vlc);
code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0 || code >= rl->n)
return DECODING_AC_LOST;
run = rl->table_run[code];