virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

optionally merge postscale into quantization table for the float aan dct

Browse Source 
Originally committed as revision 2420 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-10-23 09:11:56 +00:00
parent 10becaaf12
commit b4c3816cfa
4 changed files with 30 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libavcodec/dct-test.c
View File

@ -161,7 +161,11 @@ void dct_error(const char *name, int is_idct,
fdct_func(block);
emms(); /* for ff_mmx_idct */
if (fdct_func == fdct_ifast) {
if (fdct_func == fdct_ifast
#ifndef FAAN_POSTSCALE
|| fdct_func == ff_faandct
#endif
) {
for(i=0; i<64; i++) {
scale = 8*(1 << (AANSCALE_BITS + 11)) / aanscales[i];
block[i] = (block[i] * scale /*+ (1<<(AANSCALE_BITS-1))*/) >> AANSCALE_BITS;

21
libavcodec/faandct.c
View File

@ -32,6 +32,11 @@
#include "faandct.h"
#define FLOAT float
#ifdef FAAN_POSTSCALE
# define SCALE(x) postscale[x]
#else
# define SCALE(x) 1
#endif
//numbers generated by simple c code (not as accurate as they could be)
/*
@ -130,12 +135,12 @@ void ff_faandct(DCTELEM * data)
tmp11= tmp1 + tmp2;
tmp12= tmp1 - tmp2;
data[8*0 + i]= lrint(postscale[8*0 + i] * (tmp10 + tmp11));
data[8*4 + i]= lrint(postscale[8*4 + i] * (tmp10 - tmp11));
data[8*0 + i]= lrint(SCALE(8*0 + i) * (tmp10 + tmp11));
data[8*4 + i]= lrint(SCALE(8*4 + i) * (tmp10 - tmp11));
z1= (tmp12 + tmp13)* A1;
data[8*2 + i]= lrint(postscale[8*2 + i] * (tmp13 + z1));
data[8*6 + i]= lrint(postscale[8*6 + i] * (tmp13 - z1));
data[8*2 + i]= lrint(SCALE(8*2 + i) * (tmp13 + z1));
data[8*6 + i]= lrint(SCALE(8*6 + i) * (tmp13 - z1));
tmp10= tmp4 + tmp5;
tmp11= tmp5 + tmp6;
@ -149,9 +154,9 @@ void ff_faandct(DCTELEM * data)
z11= tmp7 + z3;
z13= tmp7 - z3;
data[8*5 + i]= lrint(postscale[8*5 + i] * (z13 + z2));
data[8*3 + i]= lrint(postscale[8*3 + i] * (z13 - z2));
data[8*1 + i]= lrint(postscale[8*1 + i] * (z11 + z4));
data[8*7 + i]= lrint(postscale[8*7 + i] * (z11 - z4));
data[8*5 + i]= lrint(SCALE(8*5 + i) * (z13 + z2));
data[8*3 + i]= lrint(SCALE(8*3 + i) * (z13 - z2));
data[8*1 + i]= lrint(SCALE(8*1 + i) * (z11 + z4));
data[8*7 + i]= lrint(SCALE(8*7 + i) * (z11 - z4));
}
}

2
libavcodec/faandct.h
View File

@ -25,4 +25,6 @@
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#define FAAN_POSTSCALE
void ff_faandct(DCTELEM * data);

12
libavcodec/mpegvideo.c
View File

@ -101,7 +101,11 @@ static void convert_matrix(MpegEncContext *s, int (*qmat)[64], uint16_t (*qmat16
for(qscale=qmin; qscale<=qmax; qscale++){
int i;
if (s->dsp.fdct == ff_jpeg_fdct_islow || s->dsp.fdct == ff_faandct) {
if (s->dsp.fdct == ff_jpeg_fdct_islow
#ifdef FAAN_POSTSCALE
|| s->dsp.fdct == ff_faandct
#endif
) {
for(i=0;i<64;i++) {
const int j= s->dsp.idct_permutation[i];
/* 16 <= qscale * quant_matrix[i] <= 7905 */
@ -112,7 +116,11 @@ static void convert_matrix(MpegEncContext *s, int (*qmat)[64], uint16_t (*qmat16
qmat[qscale][i] = (int)((uint64_t_C(1) << QMAT_SHIFT) /
(qscale * quant_matrix[j]));
}
} else if (s->dsp.fdct == fdct_ifast) {
} else if (s->dsp.fdct == fdct_ifast
#ifndef FAAN_POSTSCALE
|| s->dsp.fdct == ff_faandct
#endif
) {
for(i=0;i<64;i++) {
const int j= s->dsp.idct_permutation[i];
/* 16 <= qscale * quant_matrix[i] <= 7905 */