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https://github.com/FFmpeg/FFmpeg.git
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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>
120 lines
3.9 KiB
C
120 lines
3.9 KiB
C
/*
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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 <stdint.h>
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#include "libavutil/attributes.h"
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#include "libavutil/common.h"
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#include "audiodsp.h"
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static inline uint32_t clipf_c_one(uint32_t a, uint32_t mini,
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uint32_t maxi, uint32_t maxisign)
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{
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if (a > mini)
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return mini;
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else if ((a ^ (1U << 31)) > maxisign)
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return maxi;
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else
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return a;
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}
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static void vector_clipf_c_opposite_sign(float *dst, const float *src,
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float *min, float *max, int len)
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{
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int i;
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uint32_t mini = *(uint32_t *) min;
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uint32_t maxi = *(uint32_t *) max;
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uint32_t maxisign = maxi ^ (1U << 31);
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uint32_t *dsti = (uint32_t *) dst;
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const uint32_t *srci = (const uint32_t *) src;
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for (i = 0; i < len; i += 8) {
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dsti[i + 0] = clipf_c_one(srci[i + 0], mini, maxi, maxisign);
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dsti[i + 1] = clipf_c_one(srci[i + 1], mini, maxi, maxisign);
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dsti[i + 2] = clipf_c_one(srci[i + 2], mini, maxi, maxisign);
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dsti[i + 3] = clipf_c_one(srci[i + 3], mini, maxi, maxisign);
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dsti[i + 4] = clipf_c_one(srci[i + 4], mini, maxi, maxisign);
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dsti[i + 5] = clipf_c_one(srci[i + 5], mini, maxi, maxisign);
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dsti[i + 6] = clipf_c_one(srci[i + 6], mini, maxi, maxisign);
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dsti[i + 7] = clipf_c_one(srci[i + 7], mini, maxi, maxisign);
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}
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}
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static void vector_clipf_c(float *dst, const float *src, int len,
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float min, float max)
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{
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int i;
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if (min < 0 && max > 0) {
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vector_clipf_c_opposite_sign(dst, src, &min, &max, len);
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} else {
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for (i = 0; i < len; i += 8) {
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dst[i] = av_clipf(src[i], min, max);
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dst[i + 1] = av_clipf(src[i + 1], min, max);
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dst[i + 2] = av_clipf(src[i + 2], min, max);
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dst[i + 3] = av_clipf(src[i + 3], min, max);
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dst[i + 4] = av_clipf(src[i + 4], min, max);
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dst[i + 5] = av_clipf(src[i + 5], min, max);
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dst[i + 6] = av_clipf(src[i + 6], min, max);
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dst[i + 7] = av_clipf(src[i + 7], min, max);
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}
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}
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}
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static int32_t scalarproduct_int16_c(const int16_t *v1, const int16_t *v2,
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int order)
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{
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unsigned res = 0;
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while (order--)
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res += *v1++ **v2++;
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return res;
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}
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static void vector_clip_int32_c(int32_t *dst, const int32_t *src, int32_t min,
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int32_t max, unsigned int len)
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{
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do {
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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*dst++ = av_clip(*src++, min, max);
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len -= 8;
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} while (len > 0);
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}
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av_cold void ff_audiodsp_init(AudioDSPContext *c)
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{
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c->scalarproduct_int16 = scalarproduct_int16_c;
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c->vector_clip_int32 = vector_clip_int32_c;
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c->vector_clipf = vector_clipf_c;
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#if ARCH_ARM
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ff_audiodsp_init_arm(c);
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#elif ARCH_PPC
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ff_audiodsp_init_ppc(c);
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#elif ARCH_X86
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ff_audiodsp_init_x86(c);
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#endif
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}
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