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40e6575aa3
This is more spec-compliant because it does not rely on dead-code elimination by the compiler. Especially MSVC has problems with this, as can be seen in https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/296373.html or https://ffmpeg.org/pipermail/ffmpeg-devel/2022-May/297022.html This commit does not eliminate every instance where we rely on dead code elimination: It only tackles branching to the initialization of arch-specific dsp code, not e.g. all uses of CONFIG_ and HAVE_ checks. But maybe it is already enough to compile FFmpeg with MSVC with whole-programm-optimizations enabled (if one does not disable too many components). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/*
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* Apple ProRes compatible decoder
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*
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* Copyright (c) 2010-2011 Maxim Poliakovski
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "idctdsp.h"
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#include "proresdsp.h"
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#include "simple_idct.h"
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#define CLIP_MIN (1 << 2) ///< minimum value for clipping resulting pixels
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#define CLIP_MAX_10 (1 << 10) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
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#define CLIP_MAX_12 (1 << 12) - CLIP_MIN - 1 ///< maximum value for clipping resulting pixels
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#define CLIP_10(x) (av_clip((x), CLIP_MIN, CLIP_MAX_10))
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#define CLIP_12(x) (av_clip((x), CLIP_MIN, CLIP_MAX_12))
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/**
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* Add bias value, clamp and output pixels of a slice
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*/
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static inline void put_pixel(uint16_t *dst, ptrdiff_t linesize, const int16_t *in, int bits_per_raw_sample) {
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int x, y, src_offset, dst_offset;
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for (y = 0, dst_offset = 0; y < 8; y++, dst_offset += linesize) {
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for (x = 0; x < 8; x++) {
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src_offset = (y << 3) + x;
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if (bits_per_raw_sample == 10) {
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dst[dst_offset + x] = CLIP_10(in[src_offset]);
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} else {//12b
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dst[dst_offset + x] = CLIP_12(in[src_offset]);
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}
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}
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}
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}
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static void put_pixels_10(uint16_t *dst, ptrdiff_t linesize, const int16_t *in)
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{
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put_pixel(dst, linesize, in, 10);
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}
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static void put_pixels_12(uint16_t *dst, ptrdiff_t linesize, const int16_t *in)
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{
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put_pixel(dst, linesize, in, 12);
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}
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static void prores_idct_put_10_c(uint16_t *out, ptrdiff_t linesize, int16_t *block, const int16_t *qmat)
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{
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ff_prores_idct_10(block, qmat);
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put_pixels_10(out, linesize >> 1, block);
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}
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static void prores_idct_put_12_c(uint16_t *out, ptrdiff_t linesize, int16_t *block, const int16_t *qmat)
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{
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ff_prores_idct_12(block, qmat);
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put_pixels_12(out, linesize >> 1, block);
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}
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av_cold int ff_proresdsp_init(ProresDSPContext *dsp, AVCodecContext *avctx)
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{
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if (avctx->bits_per_raw_sample == 10) {
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dsp->idct_put = prores_idct_put_10_c;
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dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
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} else if (avctx->bits_per_raw_sample == 12) {
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dsp->idct_put = prores_idct_put_12_c;
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dsp->idct_permutation_type = FF_IDCT_PERM_NONE;
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} else {
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return AVERROR_BUG;
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}
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#if ARCH_X86
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ff_proresdsp_init_x86(dsp, avctx);
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#endif
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ff_init_scantable_permutation(dsp->idct_permutation,
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dsp->idct_permutation_type);
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return 0;
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}
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