generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Integrate reference mpeg IDCT into dsputil.

Browse Source 
Originally committed as revision 9603 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ivan Kalvachev 2007-07-11 22:05:43 +00:00
parent c3d0c11bfb
commit ddeaf723c5
5 changed files with 29 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
libavcodec/Makefile
View File

@ -13,6 +13,7 @@ OBJS= bitstream.o \
jrevdct.o \
jfdctfst.o \
jfdctint.o\
mpegidct.o \
resample.o \
resample2.o \
dsputil.o \

1
libavcodec/avcodec.h
View File

@ -1278,6 +1278,7 @@ typedef struct AVCodecContext {
#define FF_IDCT_CAVS 15
#define FF_IDCT_SIMPLEARMV5TE 16
#define FF_IDCT_SIMPLEARMV6 17
#define FF_IDCT_MPEG 18
/**
* slice count

16
libavcodec/dsputil.c
View File

@ -3753,6 +3753,17 @@ void ff_float_to_int16_c(int16_t *dst, const float *src, int len){
/* XXX: those functions should be suppressed ASAP when all IDCTs are
converted */
static void ff_mpeg_idct_put_c(uint8_t *dest, int line_size, DCTELEM *block)
{
ff_mpeg_idct_c(block);
put_pixels_clamped_c(block, dest, line_size);
}
static void ff_mpeg_idct_add_c(uint8_t *dest, int line_size, DCTELEM *block)
{
ff_mpeg_idct_c(block);
add_pixels_clamped_c(block, dest, line_size);
}
static void ff_jref_idct_put(uint8_t *dest, int line_size, DCTELEM *block)
{
j_rev_dct (block);
@ -3891,6 +3902,11 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
c->idct_add= ff_vp3_idct_add_c;
c->idct = ff_vp3_idct_c;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else if(avctx->idct_algo==FF_IDCT_MPEG){
c->idct_put= ff_mpeg_idct_put_c;
c->idct_add= ff_mpeg_idct_add_c;
c->idct = ff_mpeg_idct_c;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else{ //accurate/default
c->idct_put= simple_idct_put;
c->idct_add= simple_idct_add;

1
libavcodec/dsputil.h
View File

@ -47,6 +47,7 @@ void j_rev_dct (DCTELEM *data);
void j_rev_dct4 (DCTELEM *data);
void j_rev_dct2 (DCTELEM *data);
void j_rev_dct1 (DCTELEM *data);
void ff_mpeg_idct_c(DCTELEM *data);
void ff_fdct_mmx(DCTELEM *block);
void ff_fdct_mmx2(DCTELEM *block);

42
libavcodec/mpegidct.c
View File

@ -41,7 +41,6 @@
/* this code assumes >> to be a two's-complement arithmetic */
/* right shift: (-2)>>1 == -1 , (-3)>>1 == -2 */
#include "config.h"
#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */
#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */
@ -50,18 +49,6 @@
#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */
#define W7 565 /* 2048*sqrt(2)*cos(7*pi/16) */
/* global declarations */
void Initialize_Fast_IDCT _ANSI_ARGS_((void));
void Fast_IDCT _ANSI_ARGS_((short *block));
/* private data */
static short iclip[1024]; /* clipping table */
static short *iclp;
/* private prototypes */
static void idctrow _ANSI_ARGS_((short *blk));
static void idctcol _ANSI_ARGS_((short *blk));
/* row (horizontal) IDCT
*
* 7 pi 1
@ -144,7 +131,7 @@ short *blk;
(x4 = blk[8*1]) | (x5 = blk[8*7]) | (x6 = blk[8*5]) | (x7 = blk[8*3])))
{
blk[8*0]=blk[8*1]=blk[8*2]=blk[8*3]=blk[8*4]=blk[8*5]=blk[8*6]=blk[8*7]=
iclp[(blk[8*0]+32)>>6];
(blk[8*0]+32)>>6;
return;
}
@ -178,18 +165,18 @@ short *blk;
x4 = (181*(x4-x5)+128)>>8;
/* fourth stage */
blk[8*0] = iclp[(x7+x1)>>14];
blk[8*1] = iclp[(x3+x2)>>14];
blk[8*2] = iclp[(x0+x4)>>14];
blk[8*3] = iclp[(x8+x6)>>14];
blk[8*4] = iclp[(x8-x6)>>14];
blk[8*5] = iclp[(x0-x4)>>14];
blk[8*6] = iclp[(x3-x2)>>14];
blk[8*7] = iclp[(x7-x1)>>14];
blk[8*0] = (x7+x1)>>14;
blk[8*1] = (x3+x2)>>14;
blk[8*2] = (x0+x4)>>14;
blk[8*3] = (x8+x6)>>14;
blk[8*4] = (x8-x6)>>14;
blk[8*5] = (x0-x4)>>14;
blk[8*6] = (x3-x2)>>14;
blk[8*7] = (x7-x1)>>14;
}
/* two dimensional inverse discrete cosine transform */
void Fast_IDCT(block)
void ff_mpeg_idct_c(block)
short *block;
{
int i;
@ -200,12 +187,3 @@ short *block;
for (i=0; i<8; i++)
idctcol(block+i);
}
void Initialize_Fast_IDCT()
{
int i;
iclp = iclip+512;
for (i= -512; i<512; i++)
iclp[i] = (i<-256) ? -256 : ((i>255) ? 255 : i);
}