diff options
Diffstat (limited to 'libavcodec/cavs.h')
-rw-r--r-- | libavcodec/cavs.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libavcodec/cavs.h b/libavcodec/cavs.h index b98ffd7799..71a0aba71f 100644 --- a/libavcodec/cavs.h +++ b/libavcodec/cavs.h @@ -441,4 +441,24 @@ static inline int next_mb(AVSContext *h) { 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 */ |