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qscale has a range of 0..51 we thus do not need a 256 entry table and neither need

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to and it with 0xFF.

Originally committed as revision 14336 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-07-22 13:01:10 +00:00
parent a82688b003
commit 5a78bfbde7
2 changed files with 4 additions and 4 deletions
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6
libavcodec/h264.c
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@ -1584,7 +1584,7 @@ static void chroma_dc_dct_c(DCTELEM *block){
* gets the chroma qp.
*/
static inline int get_chroma_qp(H264Context *h, int t, int qscale){
return h->pps.chroma_qp_table[t][qscale & 0xff];
return h->pps.chroma_qp_table[t][qscale];
}
//FIXME need to check that this does not overflow signed 32 bit for low qp, I am not sure, it's very close
@ -7337,8 +7337,8 @@ static void
build_qp_table(PPS *pps, int t, int index)
{
int i;
for(i = 0; i < 255; i++)
pps->chroma_qp_table[t][i & 0xff] = chroma_qp[av_clip(i + index, 0, 51)];
for(i = 0; i < 52; i++)
pps->chroma_qp_table[t][i] = chroma_qp[av_clip(i + index, 0, 51)];
}
static inline int decode_picture_parameter_set(H264Context *h, int bit_length){

2
libavcodec/h264.h
View File

@ -138,7 +138,7 @@ typedef struct PPS{
int transform_8x8_mode; ///< transform_8x8_mode_flag
uint8_t scaling_matrix4[6][16];
uint8_t scaling_matrix8[2][64];
uint8_t chroma_qp_table[2][256]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
int chroma_qp_diff;
}PPS;