mirror of
https://github.com/danog/libtgvoip.git
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134 lines
4.6 KiB
C
134 lines
4.6 KiB
C
/*
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* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/* The global function contained in this file initializes SPL function
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* pointers, currently only for ARM platforms.
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*
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* Some code came from common/rtcd.c in the WebM project.
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*/
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "system_wrappers/include/cpu_features_wrapper.h"
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/* Declare function pointers. */
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MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16;
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MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32;
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MaxValueW16 WebRtcSpl_MaxValueW16;
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MaxValueW32 WebRtcSpl_MaxValueW32;
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MinValueW16 WebRtcSpl_MinValueW16;
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MinValueW32 WebRtcSpl_MinValueW32;
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CrossCorrelation WebRtcSpl_CrossCorrelation;
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DownsampleFast WebRtcSpl_DownsampleFast;
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ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound;
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#if (!(defined(WEBRTC_ARCH_ARM_FAMILY) && defined(WEBRTC_HAS_NEON))) && !defined(MIPS32_LE)
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/* Initialize function pointers to the generic C version. */
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static void InitPointersToC(void) {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16C;
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16C;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32C;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16C;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32C;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationC;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastC;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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}
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#endif
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#if defined(WEBRTC_ARCH_ARM_FAMILY) && defined(WEBRTC_HAS_NEON)
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/* Initialize function pointers to the Neon version. */
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static void InitPointersToNeon(void) {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16Neon;
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32Neon;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16Neon;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32Neon;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16Neon;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32Neon;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationNeon;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastNeon;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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}
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#endif
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#if defined(MIPS32_LE)
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/* Initialize function pointers to the MIPS version. */
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static void InitPointersToMIPS(void) {
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WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16_mips;
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WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16_mips;
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WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32_mips;
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WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16_mips;
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WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32_mips;
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WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelation_mips;
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WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFast_mips;
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#if defined(MIPS_DSP_R1_LE)
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32_mips;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRound_mips;
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#else
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WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
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WebRtcSpl_ScaleAndAddVectorsWithRound =
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WebRtcSpl_ScaleAndAddVectorsWithRoundC;
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#endif
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}
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#endif
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static void InitFunctionPointers(void) {
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#if defined(WEBRTC_ARCH_ARM_FAMILY) && defined(WEBRTC_HAS_NEON)
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InitPointersToNeon();
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#elif defined(MIPS32_LE)
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InitPointersToMIPS();
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#else
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InitPointersToC();
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#endif /* WEBRTC_HAS_NEON */
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}
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#if defined(WEBRTC_POSIX)
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#include <pthread.h>
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static void once(void (*func)(void)) {
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static pthread_once_t lock = PTHREAD_ONCE_INIT;
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pthread_once(&lock, func);
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}
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#elif defined(_WIN32)
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#include <windows.h>
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static void once(void (*func)(void)) {
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/* Didn't use InitializeCriticalSection() since there's no race-free context
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* in which to execute it.
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*
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* TODO(kma): Change to different implementation (e.g.
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* InterlockedCompareExchangePointer) to avoid issues similar to
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* http://code.google.com/p/webm/issues/detail?id=467.
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*/
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static CRITICAL_SECTION lock = {(void *)((size_t)-1), -1, 0, 0, 0, 0};
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static int done = 0;
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EnterCriticalSection(&lock);
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if (!done) {
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func();
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done = 1;
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}
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LeaveCriticalSection(&lock);
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}
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/* There's no fallback version as an #else block here to ensure thread safety.
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* In case of neither pthread for WEBRTC_POSIX nor _WIN32 is present, build
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* system should pick it up.
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*/
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#endif /* WEBRTC_POSIX */
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void WebRtcSpl_Init(void) {
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once(InitFunctionPointers);
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}
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