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Add a new IDCT permutation, used in xvid_sse2 and possibly future similar IDCTs.

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Originally committed as revision 12842 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alexander Strange 2008-04-16 01:34:55 +00:00
parent b4999290fd
commit 0e956ba277
2 changed files with 7 additions and 0 deletions
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6
libavcodec/dsputil.c
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@ -151,6 +151,8 @@ static const uint8_t simple_mmx_permutation[64]={
0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F,
};
static const uint8_t idct_sse2_row_perm[8] = {0, 4, 1, 5, 2, 6, 3, 7};
void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable){
int i;
int end;
@ -4476,6 +4478,10 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
for(i=0; i<64; i++)
c->idct_permutation[i]= (i&0x24) | ((i&3)<<3) | ((i>>3)&3);
break;
case FF_SSE2_IDCT_PERM:
for(i=0; i<64; i++)
c->idct_permutation[i]= (i&0x38) | idct_sse2_row_perm[i&7];
break;
default:
av_log(avctx, AV_LOG_ERROR, "Internal error, IDCT permutation not set\n");
}

1
libavcodec/dsputil.h
View File

@ -408,6 +408,7 @@ typedef struct DSPContext {
#define FF_SIMPLE_IDCT_PERM 3
#define FF_TRANSPOSE_IDCT_PERM 4
#define FF_PARTTRANS_IDCT_PERM 5
#define FF_SSE2_IDCT_PERM 6
int (*try_8x8basis)(int16_t rem[64], int16_t weight[64], int16_t basis[64], int scale);
void (*add_8x8basis)(int16_t rem[64], int16_t basis[64], int scale);