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1/4 resolution decoding

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Originally committed as revision 3509 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-09-26 00:18:12 +00:00
parent 8cbd529f12
commit 9ca358b951
4 changed files with 63 additions and 4 deletions
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3
libavcodec/avcodec.h
View File

@ -17,7 +17,7 @@ extern "C" {
#define FFMPEG_VERSION_INT 0x000409
#define FFMPEG_VERSION "0.4.9-pre1"
#define LIBAVCODEC_BUILD 4722
#define LIBAVCODEC_BUILD 4723
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -1111,7 +1111,6 @@ typedef struct AVCodecContext {
#define FF_IDCT_ALTIVEC 8
#define FF_IDCT_SH4 9
#define FF_IDCT_SIMPLEARM 10
#define FF_IDCT_INT4 11
/**
* slice count.

47
libavcodec/dsputil.c
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@ -464,6 +464,22 @@ static void put_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels
}
}
static void put_pixels_clamped2_c(const DCTELEM *block, uint8_t *restrict pixels,
int line_size)
{
int i;
uint8_t *cm = cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = cm[block[0]];
pixels[1] = cm[block[1]];
pixels += line_size;
block += 8;
}
}
static void put_signed_pixels_clamped_c(const DCTELEM *block,
uint8_t *restrict pixels,
int line_size)
@ -522,6 +538,21 @@ static void add_pixels_clamped4_c(const DCTELEM *block, uint8_t *restrict pixels
block += 8;
}
}
static void add_pixels_clamped2_c(const DCTELEM *block, uint8_t *restrict pixels,
int line_size)
{
int i;
uint8_t *cm = cropTbl + MAX_NEG_CROP;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = cm[pixels[0] + block[0]];
pixels[1] = cm[pixels[1] + block[1]];
pixels += line_size;
block += 8;
}
}
#if 0
#define PIXOP2(OPNAME, OP) \
@ -3340,6 +3371,17 @@ static void ff_jref_idct4_add(uint8_t *dest, int line_size, DCTELEM *block)
add_pixels_clamped4_c(block, dest, line_size);
}
static void ff_jref_idct2_put(uint8_t *dest, int line_size, DCTELEM *block)
{
j_rev_dct2 (block);
put_pixels_clamped2_c(block, dest, line_size);
}
static void ff_jref_idct2_add(uint8_t *dest, int line_size, DCTELEM *block)
{
j_rev_dct2 (block);
add_pixels_clamped2_c(block, dest, line_size);
}
/* init static data */
void dsputil_static_init(void)
{
@ -3383,6 +3425,11 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
c->idct_add= ff_jref_idct4_add;
c->idct = j_rev_dct4;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else if(avctx->lowres==2){
c->idct_put= ff_jref_idct2_put;
c->idct_add= ff_jref_idct2_add;
c->idct = j_rev_dct2;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else{
if(avctx->idct_algo==FF_IDCT_INT){
c->idct_put= ff_jref_idct_put;

1
libavcodec/dsputil.h
View File

@ -43,6 +43,7 @@ void ff_fdct248_islow (DCTELEM *data);
void j_rev_dct (DCTELEM *data);
void j_rev_dct4 (DCTELEM *data);
void j_rev_dct2 (DCTELEM *data);
void ff_fdct_mmx(DCTELEM *block);
void ff_fdct_mmx2(DCTELEM *block);

16
libavcodec/jrevdct.c
View File

@ -1203,8 +1203,6 @@ void j_rev_dct4(DCTBLOCK data)
register int *idataptr = (int*)dataptr;
/* WARNING: we do the same permutation as MMX idct to simplify the
video core */
d0 = dataptr[0];
d2 = dataptr[1];
d4 = dataptr[2];
@ -1627,6 +1625,20 @@ void j_rev_dct4(DCTBLOCK data)
}
}
void j_rev_dct2(DCTBLOCK data){
int d00, d01, d10, d11;
data[0] += 4;
d00 = data[0+0*DCTSTRIDE] + data[1+0*DCTSTRIDE];
d01 = data[0+0*DCTSTRIDE] - data[1+0*DCTSTRIDE];
d10 = data[0+1*DCTSTRIDE] + data[1+1*DCTSTRIDE];
d11 = data[0+1*DCTSTRIDE] - data[1+1*DCTSTRIDE];
data[0+0*DCTSTRIDE]= (d00 + d10)>>3;
data[1+0*DCTSTRIDE]= (d01 + d11)>>3;
data[0+1*DCTSTRIDE]= (d00 - d10)>>3;
data[1+1*DCTSTRIDE]= (d01 - d11)>>3;
}
#undef FIX
#undef CONST_BITS