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ppsspp/ext/ffmpeg/libavcodec/simple_idct_template.c
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Henrik RydgårdandClaude Opus 5.5 d0e3141f43 FFmpeg: Vendor what PPSSPP uses into ext/ffmpeg, drop the submodule 
The ffmpeg submodule held prebuilt libraries for every platform next to the
sources (about 1.5 GB checked out), and nothing uses those any more. Only the
needed sources are copied in, from the submodule's commit, along with every
header and template they include. The path is new, so checking out commits on
either side of this works.

It's also cut down to what PPSSPP uses: the H.264, AAC, MP3, ATRAC3 and ATRAC3+
decoders, the H.264 parser, the demuxers as before, and the FFV1 encoder, AVI
muxer and file protocol for AVI dumping. config.h takes its CONFIG_ values from
FFmpeg 3.0.2's own configure run with just those enabled. The raw H.264 demuxer
stays even though nothing opens raw H.264: probing PSMF data uses it to identify
the video stream's codec, which otherwise comes out as none.

On top of that:
- The files nothing links (configure would build them, but they're never pulled
  out of the static library, going by the GCC link map) are left out: mostly
  libavutil's crypto and hashing and the alternative DCT/IDCT/FFT versions.
- libswresample isn't built, now that nothing uses it.
- The H.264 decoder only does 8-bit video, which is all the PSP has. The SPS
  parser rejects any other bit depth, and the DSP files no longer build their 9-
  to 16-bit variants, which the linker kept because the init functions pick one
  by bit depth at run time.

That's 160 files to compile instead of 277, and 391 of FFmpeg's vendored, about
5.8 MB. The README in ext/ffmpeg has what was done, the PPSSPP patches in the
copy, how to add a component, and the tradeoffs.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-25 22:27:54 +01:00

358 lines
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C
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/*
* Simple IDCT
*
* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
*
* 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
*/
/**
* @file
* simpleidct in C.
*/
/*
based upon some outcommented c code from mpeg2dec (idct_mmx.c
written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
*/
#include "simple_idct.h"
#include "bit_depth_template.c"
#undef W1
#undef W2
#undef W3
#undef W4
#undef W5
#undef W6
#undef W7
#undef ROW_SHIFT
#undef COL_SHIFT
#undef DC_SHIFT
#undef MUL
#undef MAC
#if BIT_DEPTH == 8
#define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5
#define ROW_SHIFT 11
#define COL_SHIFT 20
#define DC_SHIFT 3
#define MUL(a, b) MUL16(a, b)
#define MAC(a, b, c) MAC16(a, b, c)
#elif BIT_DEPTH == 10 || BIT_DEPTH == 12
# if BIT_DEPTH == 10
#define W1 22725 // 90901
#define W2 21407 // 85627
#define W3 19265 // 77062
#define W4 16384 // 65535
#define W5 12873 // 51491
#define W6 8867 // 35468
#define W7 4520 // 18081
# ifdef EXTRA_SHIFT
#define ROW_SHIFT 13
#define COL_SHIFT 18
#define DC_SHIFT 1
# else
#define ROW_SHIFT 12
#define COL_SHIFT 19
#define DC_SHIFT 2
# endif
# else
#define W1 45451
#define W2 42813
#define W3 38531
#define W4 32767
#define W5 25746
#define W6 17734
#define W7 9041
#define ROW_SHIFT 16
#define COL_SHIFT 17
#define DC_SHIFT -1
# endif
#define MUL(a, b) ((a) * (b))
#define MAC(a, b, c) ((a) += (b) * (c))
#else
#error "Unsupported bitdepth"
#endif
#ifdef EXTRA_SHIFT
static inline void FUNC(idctRowCondDC_extrashift)(int16_t *row, int extra_shift)
#else
static inline void FUNC(idctRowCondDC)(int16_t *row, int extra_shift)
#endif
{
int a0, a1, a2, a3, b0, b1, b2, b3;
#if HAVE_FAST_64BIT
#define ROW0_MASK (0xffffLL << 48 * HAVE_BIGENDIAN)
if (((((uint64_t *)row)[0] & ~ROW0_MASK) | ((uint64_t *)row)[1]) == 0) {
uint64_t temp;
if (DC_SHIFT - extra_shift >= 0) {
temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
} else {
temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
}
temp += temp * (1 << 16);
temp += temp * ((uint64_t) 1 << 32);
((uint64_t *)row)[0] = temp;
((uint64_t *)row)[1] = temp;
return;
}
#else
if (!(((uint32_t*)row)[1] |
((uint32_t*)row)[2] |
((uint32_t*)row)[3] |
row[1])) {
uint32_t temp;
if (DC_SHIFT - extra_shift >= 0) {
temp = (row[0] * (1 << (DC_SHIFT - extra_shift))) & 0xffff;
} else {
temp = ((row[0] + (1<<(extra_shift - DC_SHIFT-1))) >> (extra_shift - DC_SHIFT)) & 0xffff;
}
temp += temp * (1 << 16);
((uint32_t*)row)[0]=((uint32_t*)row)[1] =
((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp;
return;
}
#endif
a0 = (W4 * row[0]) + (1 << (ROW_SHIFT + extra_shift - 1));
a1 = a0;
a2 = a0;
a3 = a0;
a0 += W2 * row[2];
a1 += W6 * row[2];
a2 -= W6 * row[2];
a3 -= W2 * row[2];
b0 = MUL(W1, row[1]);
MAC(b0, W3, row[3]);
b1 = MUL(W3, row[1]);
MAC(b1, -W7, row[3]);
b2 = MUL(W5, row[1]);
MAC(b2, -W1, row[3]);
b3 = MUL(W7, row[1]);
MAC(b3, -W5, row[3]);
if (AV_RN64A(row + 4)) {
a0 += W4*row[4] + W6*row[6];
a1 += - W4*row[4] - W2*row[6];
a2 += - W4*row[4] + W2*row[6];
a3 += W4*row[4] - W6*row[6];
MAC(b0, W5, row[5]);
MAC(b0, W7, row[7]);
MAC(b1, -W1, row[5]);
MAC(b1, -W5, row[7]);
MAC(b2, W7, row[5]);
MAC(b2, W3, row[7]);
MAC(b3, W3, row[5]);
MAC(b3, -W1, row[7]);
}
row[0] = (a0 + b0) >> (ROW_SHIFT + extra_shift);
row[7] = (a0 - b0) >> (ROW_SHIFT + extra_shift);
row[1] = (a1 + b1) >> (ROW_SHIFT + extra_shift);
row[6] = (a1 - b1) >> (ROW_SHIFT + extra_shift);
row[2] = (a2 + b2) >> (ROW_SHIFT + extra_shift);
row[5] = (a2 - b2) >> (ROW_SHIFT + extra_shift);
row[3] = (a3 + b3) >> (ROW_SHIFT + extra_shift);
row[4] = (a3 - b3) >> (ROW_SHIFT + extra_shift);
}
#define IDCT_COLS do { \
a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); \
a1 = a0; \
a2 = a0; \
a3 = a0; \
\
a0 += W2*col[8*2]; \
a1 += W6*col[8*2]; \
a2 += -W6*col[8*2]; \
a3 += -W2*col[8*2]; \
\
b0 = MUL(W1, col[8*1]); \
b1 = MUL(W3, col[8*1]); \
b2 = MUL(W5, col[8*1]); \
b3 = MUL(W7, col[8*1]); \
\
MAC(b0, W3, col[8*3]); \
MAC(b1, -W7, col[8*3]); \
MAC(b2, -W1, col[8*3]); \
MAC(b3, -W5, col[8*3]); \
\
if (col[8*4]) { \
a0 += W4*col[8*4]; \
a1 += -W4*col[8*4]; \
a2 += -W4*col[8*4]; \
a3 += W4*col[8*4]; \
} \
\
if (col[8*5]) { \
MAC(b0, W5, col[8*5]); \
MAC(b1, -W1, col[8*5]); \
MAC(b2, W7, col[8*5]); \
MAC(b3, W3, col[8*5]); \
} \
\
if (col[8*6]) { \
a0 += W6*col[8*6]; \
a1 += -W2*col[8*6]; \
a2 += W2*col[8*6]; \
a3 += -W6*col[8*6]; \
} \
\
if (col[8*7]) { \
MAC(b0, W7, col[8*7]); \
MAC(b1, -W5, col[8*7]); \
MAC(b2, W3, col[8*7]); \
MAC(b3, -W1, col[8*7]); \
} \
} while (0)
#ifdef EXTRA_SHIFT
static inline void FUNC(idctSparseCol_extrashift)(int16_t *col)
#else
static inline void FUNC(idctSparseColPut)(pixel *dest, int line_size,
int16_t *col)
{
int a0, a1, a2, a3, b0, b1, b2, b3;
IDCT_COLS;
dest[0] = av_clip_pixel((a0 + b0) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a1 + b1) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a2 + b2) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a3 + b3) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a3 - b3) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a2 - b2) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a1 - b1) >> COL_SHIFT);
dest += line_size;
dest[0] = av_clip_pixel((a0 - b0) >> COL_SHIFT);
}
static inline void FUNC(idctSparseColAdd)(pixel *dest, int line_size,
int16_t *col)
{
int a0, a1, a2, a3, b0, b1, b2, b3;
IDCT_COLS;
dest[0] = av_clip_pixel(dest[0] + ((a0 + b0) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a1 + b1) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a2 + b2) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a3 + b3) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a3 - b3) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a2 - b2) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a1 - b1) >> COL_SHIFT));
dest += line_size;
dest[0] = av_clip_pixel(dest[0] + ((a0 - b0) >> COL_SHIFT));
}
static inline void FUNC(idctSparseCol)(int16_t *col)
#endif
{
int a0, a1, a2, a3, b0, b1, b2, b3;
IDCT_COLS;
col[0 ] = ((a0 + b0) >> COL_SHIFT);
col[8 ] = ((a1 + b1) >> COL_SHIFT);
col[16] = ((a2 + b2) >> COL_SHIFT);
col[24] = ((a3 + b3) >> COL_SHIFT);
col[32] = ((a3 - b3) >> COL_SHIFT);
col[40] = ((a2 - b2) >> COL_SHIFT);
col[48] = ((a1 - b1) >> COL_SHIFT);
col[56] = ((a0 - b0) >> COL_SHIFT);
}
#ifndef EXTRA_SHIFT
void FUNC(ff_simple_idct_put)(uint8_t *dest_, int line_size, int16_t *block)
{
pixel *dest = (pixel *)dest_;
int i;
line_size /= sizeof(pixel);
for (i = 0; i < 8; i++)
FUNC(idctRowCondDC)(block + i*8, 0);
for (i = 0; i < 8; i++)
FUNC(idctSparseColPut)(dest + i, line_size, block + i);
}
void FUNC(ff_simple_idct_add)(uint8_t *dest_, int line_size, int16_t *block)
{
pixel *dest = (pixel *)dest_;
int i;
line_size /= sizeof(pixel);
for (i = 0; i < 8; i++)
FUNC(idctRowCondDC)(block + i*8, 0);
for (i = 0; i < 8; i++)
FUNC(idctSparseColAdd)(dest + i, line_size, block + i);
}
void FUNC(ff_simple_idct)(int16_t *block)
{
int i;
for (i = 0; i < 8; i++)
FUNC(idctRowCondDC)(block + i*8, 0);
for (i = 0; i < 8; i++)
FUNC(idctSparseCol)(block + i);
}
#endif
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