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FFmpeg/libavcodec/idctdsp.c
Sean McGovern cdd139d760 libavcodec/alpha: remove DSP & support code 
Introduced in 1992, the Alpha was a 64-bit RISC processor designed
to replace the VAX CISC machines sold by Digital Equipment Corporation.

After Digital was acquired by Compaq in 1998 -- who themselves would be
later purchased by Hewlett-Packard, the architecture was phased out over
the following decade. It became effectively defunct in 2007, the last
publicly available processor being the Alpha 21364.

FFmpeg has not added any DSP code for this architecture since lowres2
was introduced in 2012, and it is more than unlikely someone still wishes
to maintain it.

Remove the DSP and support code.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2024-06-13 23:14:26 +02:00

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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 "config_components.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"
#include "xvididct.h"
av_cold void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
const uint8_t permutation[64])
{
for (int i = 0; i < 64; i++) {
int j = src[i];
dst[i] = permutation[j];
}
}
av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
enum idct_permutation_type perm_type)
{
int i;
#if ARCH_X86
if (ff_init_scantable_permutation_x86(idct_permutation,
perm_type))
return;
#endif
switch (perm_type) {
case FF_IDCT_PERM_NONE:
for (i = 0; i < 64; i++)
idct_permutation[i] = i;
break;
case FF_IDCT_PERM_LIBMPEG2:
for (i = 0; i < 64; i++)
idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
break;
case FF_IDCT_PERM_TRANSPOSE:
for (i = 0; i < 64; i++)
idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
break;
case FF_IDCT_PERM_PARTTRANS:
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");
}
}
void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
ptrdiff_t 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 *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 *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 *restrict pixels,
ptrdiff_t 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);
}
}
void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
ptrdiff_t 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 *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 *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 ff_jref_idct4_put(uint8_t *dest, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t 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, ptrdiff_t line_size, int16_t *block)
{
dest[0] = av_clip_uint8((block[0] + 4)>>3);
}
static void ff_jref_idct1_add(uint8_t *dest, ptrdiff_t 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)
{
av_unused 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->perm_type = FF_IDCT_PERM_NONE;
} 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->perm_type = FF_IDCT_PERM_NONE;
} 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->perm_type = FF_IDCT_PERM_NONE;
} else {
if (avctx->bits_per_raw_sample == 10 || avctx->bits_per_raw_sample == 9) {
/* 10-bit MPEG-4 Simple Studio Profile requires a higher precision IDCT
However, it only uses idct_put */
if (c->mpeg4_studio_profile) {
c->idct_put = ff_simple_idct_put_int32_10bit;
c->idct_add = NULL;
c->idct = NULL;
} else {
c->idct_put = ff_simple_idct_put_int16_10bit;
c->idct_add = ff_simple_idct_add_int16_10bit;
c->idct = ff_simple_idct_int16_10bit;
}
c->perm_type = FF_IDCT_PERM_NONE;
} else if (avctx->bits_per_raw_sample == 12) {
c->idct_put = ff_simple_idct_put_int16_12bit;
c->idct_add = ff_simple_idct_add_int16_12bit;
c->idct = ff_simple_idct_int16_12bit;
c->perm_type = FF_IDCT_PERM_NONE;
} else {
if (avctx->idct_algo == FF_IDCT_INT) {
c->idct_put = ff_jref_idct_put;
c->idct_add = ff_jref_idct_add;
c->idct = ff_j_rev_dct;
c->perm_type = FF_IDCT_PERM_LIBMPEG2;
#if CONFIG_FAANIDCT
} 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->perm_type = FF_IDCT_PERM_NONE;
#endif /* CONFIG_FAANIDCT */
} else { // accurate/default
c->idct_put = ff_simple_idct_put_int16_8bit;
c->idct_add = ff_simple_idct_add_int16_8bit;
c->idct = ff_simple_idct_int16_8bit;
c->perm_type = FF_IDCT_PERM_NONE;
}
}
}
c->put_pixels_clamped = ff_put_pixels_clamped_c;
c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
c->add_pixels_clamped = ff_add_pixels_clamped_c;
if (CONFIG_MPEG4_DECODER && avctx->idct_algo == FF_IDCT_XVID)
ff_xvid_idct_init(c, avctx);
#if ARCH_AARCH64
ff_idctdsp_init_aarch64(c, avctx, high_bit_depth);
#elif ARCH_ARM
ff_idctdsp_init_arm(c, avctx, high_bit_depth);
#elif ARCH_PPC
ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
#elif ARCH_RISCV
ff_idctdsp_init_riscv(c, avctx, high_bit_depth);
#elif ARCH_X86
ff_idctdsp_init_x86(c, avctx, high_bit_depth);
#elif ARCH_MIPS
ff_idctdsp_init_mips(c, avctx, high_bit_depth);
#elif ARCH_LOONGARCH
ff_idctdsp_init_loongarch(c, avctx, high_bit_depth);
#endif
ff_init_scantable_permutation(c->idct_permutation,
c->perm_type);
}
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