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Code Issues Releases Activity

optimization (get_vlc() -> get_vlc2())

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Originally committed as revision 751 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-07-13 16:10:27 +00:00
parent edcf989073
commit 8ed2ddb2c2
1 changed files with 27 additions and 19 deletions
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46
libavcodec/mpeg12.c
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@ -533,6 +533,14 @@ static VLC mb_ptype_vlc;
static VLC mb_btype_vlc; static VLC mb_btype_vlc;
static VLC mb_pat_vlc; static VLC mb_pat_vlc;
#define DC_VLC_BITS 9
#define MV_VLC_BITS 9
#define MBINCR_VLC_BITS 9
#define MB_PAT_VLC_BITS 9
#define MB_PTYPE_VLC_BITS 6
#define MB_BTYPE_VLC_BITS 6
#define TEX_VLC_BITS 9
void mpeg1_init_vlc(MpegEncContext *s) void mpeg1_init_vlc(MpegEncContext *s)
{ {
static int done = 0; static int done = 0;
@ -540,35 +548,35 @@ void mpeg1_init_vlc(MpegEncContext *s)
if (!done) { if (!done) {
done = 1; done = 1;
init_vlc(&dc_lum_vlc, 9, 12, init_vlc(&dc_lum_vlc, DC_VLC_BITS, 10/*12*/,
vlc_dc_lum_bits, 1, 1, vlc_dc_lum_bits, 1, 1,
vlc_dc_lum_code, 2, 2); vlc_dc_lum_code, 2, 2);
init_vlc(&dc_chroma_vlc, 9, 12, init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 10/*12*/,
vlc_dc_chroma_bits, 1, 1, vlc_dc_chroma_bits, 1, 1,
vlc_dc_chroma_code, 2, 2); vlc_dc_chroma_code, 2, 2);
init_vlc(&mv_vlc, 9, 17, init_vlc(&mv_vlc, MV_VLC_BITS, 17,
&mbMotionVectorTable[0][1], 2, 1, &mbMotionVectorTable[0][1], 2, 1,
&mbMotionVectorTable[0][0], 2, 1); &mbMotionVectorTable[0][0], 2, 1);
init_vlc(&mbincr_vlc, 9, 35, init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 35,
&mbAddrIncrTable[0][1], 2, 1, &mbAddrIncrTable[0][1], 2, 1,
&mbAddrIncrTable[0][0], 2, 1); &mbAddrIncrTable[0][0], 2, 1);
init_vlc(&mb_pat_vlc, 9, 63, init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 63,
&mbPatTable[0][1], 2, 1, &mbPatTable[0][1], 2, 1,
&mbPatTable[0][0], 2, 1); &mbPatTable[0][0], 2, 1);
init_vlc(&mb_ptype_vlc, 6, 32, init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 32,
&table_mb_ptype[0][1], 2, 1, &table_mb_ptype[0][1], 2, 1,
&table_mb_ptype[0][0], 2, 1); &table_mb_ptype[0][0], 2, 1);
init_vlc(&mb_btype_vlc, 6, 32, init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 32,
&table_mb_btype[0][1], 2, 1, &table_mb_btype[0][1], 2, 1,
&table_mb_btype[0][0], 2, 1); &table_mb_btype[0][0], 2, 1);
init_rl(&rl_mpeg1); init_rl(&rl_mpeg1);
init_rl(&rl_mpeg2); init_rl(&rl_mpeg2);
/* cannot use generic init because we must add the EOB code */ /* cannot use generic init because we must add the EOB code */
init_vlc(&rl_mpeg1.vlc, 9, rl_mpeg1.n + 2, init_vlc(&rl_mpeg1.vlc, TEX_VLC_BITS, rl_mpeg1.n + 2,
&rl_mpeg1.table_vlc[0][1], 4, 2, &rl_mpeg1.table_vlc[0][1], 4, 2,
&rl_mpeg1.table_vlc[0][0], 4, 2); &rl_mpeg1.table_vlc[0][0], 4, 2);
init_vlc(&rl_mpeg2.vlc, 9, rl_mpeg2.n + 2, init_vlc(&rl_mpeg2.vlc, TEX_VLC_BITS, rl_mpeg2.n + 2,
&rl_mpeg2.table_vlc[0][1], 4, 2, &rl_mpeg2.table_vlc[0][1], 4, 2,
&rl_mpeg2.table_vlc[0][0], 4, 2); &rl_mpeg2.table_vlc[0][0], 4, 2);
} }
@ -614,7 +622,7 @@ static int mpeg_decode_mb(MpegEncContext *s,
/* read again increment */ /* read again increment */
s->mb_incr = 1; s->mb_incr = 1;
for(;;) { for(;;) {
code = get_vlc(&s->gb, &mbincr_vlc); code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2);
if (code < 0) if (code < 0)
return 1; /* error = end of slice */ return 1; /* error = end of slice */
if (code >= 33) { if (code >= 33) {
@ -671,12 +679,12 @@ static int mpeg_decode_mb(MpegEncContext *s,
} }
break; break;
case P_TYPE: case P_TYPE:
mb_type = get_vlc(&s->gb, &mb_ptype_vlc); mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1);
if (mb_type < 0) if (mb_type < 0)
return -1; return -1;
break; break;
case B_TYPE: case B_TYPE:
mb_type = get_vlc(&s->gb, &mb_btype_vlc); mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1);
if (mb_type < 0) if (mb_type < 0)
return -1; return -1;
break; break;
@ -846,7 +854,7 @@ static int mpeg_decode_mb(MpegEncContext *s,
} }
if (mb_type & MB_PAT) { if (mb_type & MB_PAT) {
cbp = get_vlc(&s->gb, &mb_pat_vlc); cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1);
if (cbp < 0) if (cbp < 0)
return -1; return -1;
cbp++; cbp++;
@ -891,7 +899,7 @@ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred)
{ {
int code, sign, val, m, l, shift; int code, sign, val, m, l, shift;
code = get_vlc(&s->gb, &mv_vlc); code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
if (code < 0) { if (code < 0) {
return 0xffff; return 0xffff;
} }
@ -924,9 +932,9 @@ static inline int decode_dc(MpegEncContext *s, int component)
int code, diff; int code, diff;
if (component == 0) { if (component == 0) {
code = get_vlc(&s->gb, &dc_lum_vlc); code = get_vlc2(&s->gb, dc_lum_vlc.table, DC_VLC_BITS, 1);
} else { } else {
code = get_vlc(&s->gb, &dc_chroma_vlc); code = get_vlc2(&s->gb, dc_chroma_vlc.table, DC_VLC_BITS, 1);
} }
if (code < 0) if (code < 0)
return 0xffff; return 0xffff;
@ -979,7 +987,7 @@ static int mpeg1_decode_block(MpegEncContext *s,
/* now quantify & encode AC coefs */ /* now quantify & encode AC coefs */
for(;;) { for(;;) {
code = get_vlc(&s->gb, &rl->vlc); code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0) { if (code < 0) {
return -1; return -1;
} }
@ -1057,7 +1065,7 @@ static int mpeg2_decode_block_non_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */ /* now quantify & encode AC coefs */
for(;;) { for(;;) {
code = get_vlc(&s->gb, &rl->vlc); code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0) if (code < 0)
return -1; return -1;
if (code == 112) { if (code == 112) {
@ -1136,7 +1144,7 @@ static int mpeg2_decode_block_intra(MpegEncContext *s,
/* now quantify & encode AC coefs */ /* now quantify & encode AC coefs */
for(;;) { for(;;) {
code = get_vlc(&s->gb, &rl->vlc); code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
if (code < 0) if (code < 0)
return -1; return -1;
if (code == 112) { if (code == 112) {