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authorMichael Niedermayer <michaelni@gmx.at>2004-10-24 02:08:45 +0000
committerMichael Niedermayer <michaelni@gmx.at>2004-10-24 02:08:45 +0000
commit58897665aed5ee7612b64412768f6ecb026592d8 (patch)
tree925d412da091b9ee70ad65d4a89251eb51b9177e
parent7b89e963e82005169910bec4cce4074ec018875c (diff)
downloadffmpeg-58897665aed5ee7612b64412768f6ecb026592d8.tar.gz
optimization
Originally committed as revision 3629 to svn://svn.ffmpeg.org/ffmpeg/trunk
-rw-r--r--libavcodec/h264.c53
1 files changed, 25 insertions, 28 deletions
diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index a494a3be2a..9bd155dda5 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -4153,7 +4153,7 @@ static int decode_cabac_mb_mvd( H264Context *h, int list, int n, int l ) {
}
-static int get_cabac_cbf_ctx( H264Context *h, int cat, int idx ) {
+static int inline get_cabac_cbf_ctx( H264Context *h, int cat, int idx ) {
int nza, nzb;
int ctx = 0;
@@ -4181,19 +4181,18 @@ static int get_cabac_cbf_ctx( H264Context *h, int cat, int idx ) {
return ctx + 4 * cat;
}
-static int decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, int qp, int max_coeff) {
+static int inline decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, int qp, int max_coeff) {
const int mb_xy = h->s.mb_x + h->s.mb_y*h->s.mb_stride;
const uint16_t *qmul= dequant_coeff[qp];
static const int significant_coeff_flag_offset[5] = { 0, 15, 29, 44, 47 };
static const int coeff_abs_level_m1_offset[5] = {227+ 0, 227+10, 227+20, 227+30, 227+39 };
- int coeff[16];
int index[16];
int i, last;
int coeff_count = 0;
- int abslevel1 = 0;
+ int abslevel1 = 1;
int abslevelgt1 = 0;
/* cat: 0-> DC 16x16 n = 0
@@ -4225,24 +4224,31 @@ static int decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n
if( last == max_coeff -1 ) {
index[coeff_count++] = last;
}
+ assert(coeff_count > 0);
- if( cat == 0 && coeff_count > 0 )
+ if( cat == 0 )
h->cbp_table[mb_xy] |= 0x100;
else if( cat == 1 || cat == 2 )
h->non_zero_count_cache[scan8[n]] = coeff_count;
- else if( cat == 3 && coeff_count > 0 )
+ else if( cat == 3 )
h->cbp_table[mb_xy] |= 0x40 << n;
- else if( cat == 4 )
+ else {
+ assert( cat == 4 );
h->non_zero_count_cache[scan8[16+n]] = coeff_count;
+ }
for( i = coeff_count - 1; i >= 0; i-- ) {
- int ctx = (abslevelgt1 != 0 ? 0 : FFMIN( 4, abslevel1 + 1 )) + coeff_abs_level_m1_offset[cat];
+ int ctx = (abslevelgt1 != 0 ? 0 : FFMIN( 4, abslevel1 )) + coeff_abs_level_m1_offset[cat];
+ int j= scantable[index[i]];
if( get_cabac( &h->cabac, &h->cabac_state[ctx] ) == 0 ) {
- if( get_cabac_bypass( &h->cabac ) )
- coeff[i] = -1;
- else
- coeff[i] = 1;
+ if( cat == 0 || cat == 3 ) {
+ if( get_cabac_bypass( &h->cabac ) ) block[j] = -1;
+ else block[j] = 1;
+ }else{
+ if( get_cabac_bypass( &h->cabac ) ) block[j] = -qmul[j];
+ else block[j] = qmul[j];
+ }
abslevel1++;
} else {
@@ -4265,26 +4271,17 @@ static int decode_cabac_residual( H264Context *h, DCTELEM *block, int cat, int n
}
}
- if( get_cabac_bypass( &h->cabac ) )
- coeff[i] = -coeff_abs;
- else
- coeff[i] = coeff_abs;
+ if( cat == 0 || cat == 3 ) {
+ if( get_cabac_bypass( &h->cabac ) ) block[j] = -coeff_abs;
+ else block[j] = coeff_abs;
+ }else{
+ if( get_cabac_bypass( &h->cabac ) ) block[j] = -coeff_abs * qmul[j];
+ else block[j] = coeff_abs * qmul[j];
+ }
abslevelgt1++;
}
}
-
- if( cat == 0 || cat == 3 ) { /* DC */
- for(i = 0; i < coeff_count; i++) {
- block[scantable[ index[i] ]] = coeff[i];
- }
-
- } else { /* AC */
- for(i = 0; i < coeff_count; i++) {
- int j= scantable[index[i]];
- block[j] = coeff[i] * qmul[j];
- }
- }
return 0;
}