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move dequantization into its own inline function

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Originally committed as revision 9518 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer 2007-07-07 07:14:58 +00:00
parent ce7088b9a8
commit 218b3ae970
2 changed files with 26 additions and 19 deletions
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25
libavcodec/cavs.c
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@ -499,14 +499,9 @@ static inline int get_ue_code(GetBitContext *gb, int order) {
static int decode_residual_block(AVSContext *h, GetBitContext *gb, static int decode_residual_block(AVSContext *h, GetBitContext *gb,
const dec_2dvlc_t *r, int esc_golomb_order, const dec_2dvlc_t *r, int esc_golomb_order,
int qp, uint8_t *dst, int stride) { int qp, uint8_t *dst, int stride) {
int i,pos = -1; int i, level_code, esc_code, level, run, mask;
int level_code, esc_code, level, run, mask; DCTELEM level_buf[64];
int level_buf[64]; uint8_t run_buf[64];
int run_buf[64];
int dqm = dequant_mul[qp];
int dqs = dequant_shift[qp];
int dqa = 1 << (dqs - 1);
const uint8_t *scantab = h->scantable.permutated;
DCTELEM *block = h->block; DCTELEM *block = h->block;
for(i=0;i<65;i++) { for(i=0;i<65;i++) {
@ -529,17 +524,9 @@ static int decode_residual_block(AVSContext *h, GetBitContext *gb,
level_buf[i] = level; level_buf[i] = level;
run_buf[i] = run; run_buf[i] = run;
} }
/* inverse scan and dequantization */ if(dequant(h,level_buf, run_buf, block, dequant_mul[qp],
while(--i >= 0){ dequant_shift[qp], i))
pos += run_buf[i]; return -1;
if(pos > 63) {
av_log(h->s.avctx, AV_LOG_ERROR,
"position out of block bounds at pic %d MB(%d,%d)\n",
h->picture.poc, h->mbx, h->mby);
return -1;
}
block[scantab[pos]] = (level_buf[i]*dqm + dqa) >> dqs;
}
h->s.dsp.cavs_idct8_add(dst,block,stride); h->s.dsp.cavs_idct8_add(dst,block,stride);
return 0; return 0;
} }

20
libavcodec/cavs.h
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@ -441,4 +441,24 @@ static inline int next_mb(AVSContext *h) {
return 1; return 1;
} }
static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
DCTELEM *dst, int mul, int shift, int coeff_num) {
int round = 1 << (shift - 1);
int pos = -1;
const uint8_t *scantab = h->scantable.permutated;
/* inverse scan and dequantization */
while(--coeff_num >= 0){
pos += run_buf[coeff_num];
if(pos > 63) {
av_log(h->s.avctx, AV_LOG_ERROR,
"position out of block bounds at pic %d MB(%d,%d)\n",
h->picture.poc, h->mbx, h->mby);
return -1;
}
dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
}
return 0;
}
#endif /* CAVS_H */ #endif /* CAVS_H */