2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
11 /* The global function contained in this file initializes SPL function
12 * pointers, currently only for ARM platforms.
14 * Some code came from common/rtcd.c in the WebM project.
17 #include "webrtc/common_audio/signal_processing/include/real_fft.h"
18 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
19 #include "webrtc/system_wrappers/interface/cpu_features_wrapper.h"
21 /* Declare function pointers. */
22 MaxAbsValueW16 WebRtcSpl_MaxAbsValueW16;
23 MaxAbsValueW32 WebRtcSpl_MaxAbsValueW32;
24 MaxValueW16 WebRtcSpl_MaxValueW16;
25 MaxValueW32 WebRtcSpl_MaxValueW32;
26 MinValueW16 WebRtcSpl_MinValueW16;
27 MinValueW32 WebRtcSpl_MinValueW32;
28 CrossCorrelation WebRtcSpl_CrossCorrelation;
29 DownsampleFast WebRtcSpl_DownsampleFast;
30 ScaleAndAddVectorsWithRound WebRtcSpl_ScaleAndAddVectorsWithRound;
31 CreateRealFFT WebRtcSpl_CreateRealFFT;
32 FreeRealFFT WebRtcSpl_FreeRealFFT;
33 RealForwardFFT WebRtcSpl_RealForwardFFT;
34 RealInverseFFT WebRtcSpl_RealInverseFFT;
36 #if (defined(WEBRTC_DETECT_ARM_NEON) || !defined(WEBRTC_ARCH_ARM_NEON)) && \
38 /* Initialize function pointers to the generic C version. */
39 static void InitPointersToC() {
40 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16C;
41 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
42 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16C;
43 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32C;
44 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16C;
45 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32C;
46 WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationC;
47 WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastC;
48 WebRtcSpl_ScaleAndAddVectorsWithRound =
49 WebRtcSpl_ScaleAndAddVectorsWithRoundC;
50 WebRtcSpl_CreateRealFFT = WebRtcSpl_CreateRealFFTC;
51 WebRtcSpl_FreeRealFFT = WebRtcSpl_FreeRealFFTC;
52 WebRtcSpl_RealForwardFFT = WebRtcSpl_RealForwardFFTC;
53 WebRtcSpl_RealInverseFFT = WebRtcSpl_RealInverseFFTC;
57 #if defined(WEBRTC_DETECT_ARM_NEON) || defined(WEBRTC_ARCH_ARM_NEON)
58 /* Initialize function pointers to the Neon version. */
59 static void InitPointersToNeon() {
60 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16Neon;
61 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32Neon;
62 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16Neon;
63 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32Neon;
64 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16Neon;
65 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32Neon;
66 WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelationNeon;
67 WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFastNeon;
68 /* TODO(henrik.lundin): re-enable NEON when the crash from bug 3243 is
70 WebRtcSpl_ScaleAndAddVectorsWithRound =
71 WebRtcSpl_ScaleAndAddVectorsWithRoundC;
72 WebRtcSpl_CreateRealFFT = WebRtcSpl_CreateRealFFTNeon;
73 WebRtcSpl_FreeRealFFT = WebRtcSpl_FreeRealFFTNeon;
74 WebRtcSpl_RealForwardFFT = WebRtcSpl_RealForwardFFTNeon;
75 WebRtcSpl_RealInverseFFT = WebRtcSpl_RealInverseFFTNeon;
79 #if defined(MIPS32_LE)
80 /* Initialize function pointers to the MIPS version. */
81 static void InitPointersToMIPS() {
82 WebRtcSpl_MaxAbsValueW16 = WebRtcSpl_MaxAbsValueW16_mips;
83 WebRtcSpl_MaxValueW16 = WebRtcSpl_MaxValueW16_mips;
84 WebRtcSpl_MaxValueW32 = WebRtcSpl_MaxValueW32_mips;
85 WebRtcSpl_MinValueW16 = WebRtcSpl_MinValueW16_mips;
86 WebRtcSpl_MinValueW32 = WebRtcSpl_MinValueW32_mips;
87 WebRtcSpl_CrossCorrelation = WebRtcSpl_CrossCorrelation_mips;
88 WebRtcSpl_DownsampleFast = WebRtcSpl_DownsampleFast_mips;
89 WebRtcSpl_CreateRealFFT = WebRtcSpl_CreateRealFFTC;
90 WebRtcSpl_FreeRealFFT = WebRtcSpl_FreeRealFFTC;
91 WebRtcSpl_RealForwardFFT = WebRtcSpl_RealForwardFFTC;
92 WebRtcSpl_RealInverseFFT = WebRtcSpl_RealInverseFFTC;
93 #if defined(MIPS_DSP_R1_LE)
94 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32_mips;
95 WebRtcSpl_ScaleAndAddVectorsWithRound =
96 WebRtcSpl_ScaleAndAddVectorsWithRound_mips;
98 WebRtcSpl_MaxAbsValueW32 = WebRtcSpl_MaxAbsValueW32C;
99 WebRtcSpl_ScaleAndAddVectorsWithRound =
100 WebRtcSpl_ScaleAndAddVectorsWithRoundC;
105 static void InitFunctionPointers(void) {
106 #if defined(WEBRTC_DETECT_ARM_NEON)
107 if ((WebRtc_GetCPUFeaturesARM() & kCPUFeatureNEON) != 0) {
108 InitPointersToNeon();
112 #elif defined(WEBRTC_ARCH_ARM_NEON)
113 InitPointersToNeon();
114 #elif defined(MIPS32_LE)
115 InitPointersToMIPS();
118 #endif /* WEBRTC_DETECT_ARM_NEON */
121 #if defined(WEBRTC_POSIX)
124 static void once(void (*func)(void)) {
125 static pthread_once_t lock = PTHREAD_ONCE_INIT;
126 pthread_once(&lock, func);
129 #elif defined(_WIN32)
132 static void once(void (*func)(void)) {
133 /* Didn't use InitializeCriticalSection() since there's no race-free context
134 * in which to execute it.
136 * TODO(kma): Change to different implementation (e.g.
137 * InterlockedCompareExchangePointer) to avoid issues similar to
138 * http://code.google.com/p/webm/issues/detail?id=467.
140 static CRITICAL_SECTION lock = {(void *)((size_t)-1), -1, 0, 0, 0, 0};
143 EnterCriticalSection(&lock);
148 LeaveCriticalSection(&lock);
151 /* There's no fallback version as an #else block here to ensure thread safety.
152 * In case of neither pthread for WEBRTC_POSIX nor _WIN32 is present, build
153 * system should pick it up.
155 #endif /* WEBRTC_POSIX */
157 void WebRtcSpl_Init() {
158 once(InitFunctionPointers);