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ffmpeg/libavcodec/idctdsp.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "dct.h"
#include "faanidct.h"
#include "idctdsp.h"
#include "simple_idct.h"
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
const uint8_t *src_scantable)
{
int i, end;
st->scantable = src_scantable;
for (i = 0; i < 64; i++) {
int j = src_scantable[i];
st->permutated[i] = permutation[j];
}
end = -1;
for (i = 0; i < 64; i++) {
int j = st->permutated[i];
if (j > end)
end = j;
st->raster_end[i] = end;
}
}
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
int idct_permutation_type)
{
int i;
if (ARCH_X86)
if (ff_init_scantable_permutation_x86(idct_permutation,
idct_permutation_type))
return;
switch (idct_permutation_type) {
case FF_NO_IDCT_PERM:
for (i = 0; i < 64; i++)
idct_permutation[i] = i;
break;
case FF_LIBMPEG2_IDCT_PERM:
for (i = 0; i < 64; i++)
idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
break;
case FF_TRANSPOSE_IDCT_PERM:
for (i = 0; i < 64; i++)
idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
break;
case FF_PARTTRANS_IDCT_PERM:
for (i = 0; i < 64; i++)
idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
break;
default:
av_log(NULL, AV_LOG_ERROR,
"Internal error, IDCT permutation not set\n");
}
}
static void put_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for (i = 0; i < 8; i++) {
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels[2] = av_clip_uint8(block[2]);
pixels[3] = av_clip_uint8(block[3]);
pixels[4] = av_clip_uint8(block[4]);
pixels[5] = av_clip_uint8(block[5]);
pixels[6] = av_clip_uint8(block[6]);
pixels[7] = av_clip_uint8(block[7]);
pixels += line_size;
block += 8;
}
}
static void put_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for(i=0;i<4;i++) {
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels[2] = av_clip_uint8(block[2]);
pixels[3] = av_clip_uint8(block[3]);
pixels += line_size;
block += 8;
}
}
static void put_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = av_clip_uint8(block[0]);
pixels[1] = av_clip_uint8(block[1]);
pixels += line_size;
block += 8;
}
}
static void put_signed_pixels_clamped_c(const int16_t *block,
uint8_t *av_restrict pixels,
int line_size)
{
int i, j;
for (i = 0; i < 8; i++) {
for (j = 0; j < 8; j++) {
if (*block < -128)
*pixels = 0;
else if (*block > 127)
*pixels = 255;
else
*pixels = (uint8_t) (*block + 128);
block++;
pixels++;
}
pixels += (line_size - 8);
}
}
static void add_pixels_clamped_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for (i = 0; i < 8; i++) {
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels[2] = av_clip_uint8(pixels[2] + block[2]);
pixels[3] = av_clip_uint8(pixels[3] + block[3]);
pixels[4] = av_clip_uint8(pixels[4] + block[4]);
pixels[5] = av_clip_uint8(pixels[5] + block[5]);
pixels[6] = av_clip_uint8(pixels[6] + block[6]);
pixels[7] = av_clip_uint8(pixels[7] + block[7]);
pixels += line_size;
block += 8;
}
}
static void add_pixels_clamped4_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for(i=0;i<4;i++) {
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels[2] = av_clip_uint8(pixels[2] + block[2]);
pixels[3] = av_clip_uint8(pixels[3] + block[3]);
pixels += line_size;
block += 8;
}
}
static void add_pixels_clamped2_c(const int16_t *block, uint8_t *av_restrict pixels,
int line_size)
{
int i;
/* read the pixels */
for(i=0;i<2;i++) {
pixels[0] = av_clip_uint8(pixels[0] + block[0]);
pixels[1] = av_clip_uint8(pixels[1] + block[1]);
pixels += line_size;
block += 8;
}
}
static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct(block);
put_pixels_clamped_c(block, dest, line_size);
}
static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct(block);
add_pixels_clamped_c(block, dest, line_size);
}
static void ff_jref_idct4_put(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct4 (block);
put_pixels_clamped4_c(block, dest, line_size);
}
static void ff_jref_idct4_add(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct4 (block);
add_pixels_clamped4_c(block, dest, line_size);
}
static void ff_jref_idct2_put(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct2 (block);
put_pixels_clamped2_c(block, dest, line_size);
}
static void ff_jref_idct2_add(uint8_t *dest, int line_size, int16_t *block)
{
ff_j_rev_dct2 (block);
add_pixels_clamped2_c(block, dest, line_size);
}
static void ff_jref_idct1_put(uint8_t *dest, int line_size, int16_t *block)
{
dest[0] = av_clip_uint8((block[0] + 4)>>3);
}
static void ff_jref_idct1_add(uint8_t *dest, int line_size, int16_t *block)
{
dest[0] = av_clip_uint8(dest[0] + ((block[0] + 4)>>3));
}
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
{
const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
if (avctx->lowres==1) {
c->idct_put = ff_jref_idct4_put;
c->idct_add = ff_jref_idct4_add;
c->idct = ff_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 = ff_j_rev_dct2;
c->idct_permutation_type = FF_NO_IDCT_PERM;
} else if (avctx->lowres==3) {
c->idct_put = ff_jref_idct1_put;
c->idct_add = ff_jref_idct1_add;
c->idct = ff_j_rev_dct1;
c->idct_permutation_type = FF_NO_IDCT_PERM;
} else {
if (avctx->bits_per_raw_sample == 10) {
c->idct_put = ff_simple_idct_put_10;
c->idct_add = ff_simple_idct_add_10;
c->idct = ff_simple_idct_10;
c->idct_permutation_type = FF_NO_IDCT_PERM;
} else if (avctx->bits_per_raw_sample == 12) {
c->idct_put = ff_simple_idct_put_12;
c->idct_add = ff_simple_idct_add_12;
c->idct = ff_simple_idct_12;
c->idct_permutation_type = FF_NO_IDCT_PERM;
} else {
if (avctx->idct_algo == FF_IDCT_INT) {
c->idct_put = jref_idct_put;
c->idct_add = jref_idct_add;
c->idct = ff_j_rev_dct;
c->idct_permutation_type = FF_LIBMPEG2_IDCT_PERM;
} else if (avctx->idct_algo == FF_IDCT_FAAN) {
c->idct_put = ff_faanidct_put;
c->idct_add = ff_faanidct_add;
c->idct = ff_faanidct;
c->idct_permutation_type = FF_NO_IDCT_PERM;
} else { // accurate/default
c->idct_put = ff_simple_idct_put_8;
c->idct_add = ff_simple_idct_add_8;
c->idct = ff_simple_idct_8;
c->idct_permutation_type = FF_NO_IDCT_PERM;
}
}
}
c->put_pixels_clamped = put_pixels_clamped_c;
c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
c->add_pixels_clamped = add_pixels_clamped_c;
if (ARCH_ARM)
ff_idctdsp_init_arm(c, avctx, high_bit_depth);
if (ARCH_PPC)
ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
if (ARCH_X86)
ff_idctdsp_init_x86(c, avctx, high_bit_depth);
ff_init_scantable_permutation(c->idct_permutation,
c->idct_permutation_type);
}
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