Add cpp_onnxruntime

cpp_onnx/CMakeLists.txt

+cmake_minimum_required(VERSION 3.10)
+
+#-DONNXRUNTIME_DIR=D:\thirdpart\onnxruntime
+project(FastASR)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+
+# for onnxruntime
+
+IF(WIN32)
+
+
+	if(CMAKE_CL_64)
+		link_directories(${ONNXRUNTIME_DIR}\\lib)
+	else()
+		add_definitions(-D_WIN_X86)
+	endif()
+ELSE()
+
+endif()
+
+#option(FASTASR_BUILD_PYTHON_MODULE "build python module, using FastASR in Python" OFF)
+
+add_subdirectory("./third_party/webrtc")
+add_subdirectory(src)
+add_subdirectory(tester)

cpp_onnx/CMakeSettings.json

+{
+  "configurations": [
+    {
+      "name": "x64-Debug",
+      "generator": "Ninja",
+      "configurationType": "Debug",
+      "inheritEnvironments": [ "msvc_x64_x64" ],
+      "buildRoot": "${projectDir}\\out\\build\\${name}",
+      "installRoot": "${projectDir}\\out\\install\\${name}",
+      "cmakeCommandArgs": "-DONNXRUNTIME_DIR=D:\\\\thirdpart\\\\onnxruntime",
+      "buildCommandArgs": "",
+      "ctestCommandArgs": ""
+    }
+  ]
+}
\ No newline at end of file

cpp_onnx/include/Audio.h

+
+#ifndef AUDIO_H
+#define AUDIO_H
+
+#include <ComDefine.h>
+#include <queue>
+#include <stdint.h>
+
+using namespace std;
+
+class AudioFrame {
+  private:
+    int start;
+    int end;
+    int len;
+
+  public:
+    AudioFrame();
+    AudioFrame(int len);
+
+    ~AudioFrame();
+    int set_start(int val);
+    int set_end(int val, int max_len);
+    int get_start();
+    int get_len();
+    int disp();
+};
+
+class Audio {
+  private:
+    float *speech_data;
+    int16_t *speech_buff;
+    int speech_len;
+    int speech_align_len;
+    int16_t sample_rate;
+    int offset;
+    float align_size;
+    int data_type;
+    queue<AudioFrame *> frame_queue;
+
+  public:
+    Audio(int data_type);
+    Audio(int data_type, int size);
+    ~Audio();
+    void disp();
+    void loadwav(const char *filename);
+    int fetch_chunck(float *&dout, int len);
+    int fetch(float *&dout, int &len, int &flag);
+    void padding();
+    void split();
+};
+
+#endif

cpp_onnx/include/ComDefine.h

+
+#ifndef COMDEFINE_H
+#define COMDEFINE_H
+
+#define S_BEGIN  0
+#define S_MIDDLE 1
+#define S_END    2
+#define S_ALL    3
+#define S_ERR    4
+
+#endif

cpp_onnx/include/Model.h

+
+#ifndef MODEL_H
+#define MODEL_H
+
+#include <string>
+
+class Model {
+  public:
+    virtual ~Model(){};
+    virtual void reset() = 0;
+    virtual std::string forward_chunk(float *din, int len, int flag) = 0;
+    virtual std::string forward(float *din, int len, int flag) = 0;
+    virtual std::string rescoring() = 0;
+};
+
+Model *create_model(const char *path, int mode);
+#endif

cpp_onnx/include/webrtc_vad.h

+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+/*
+ * This header file includes the VAD API calls. Specific function calls are
+ * given below.
+ */
+
+#ifndef COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT
+#define COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct WebRtcVadInst VadInst;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Creates an instance to the VAD structure.
+VadInst* WebRtcVad_Create(void);
+
+// Frees the dynamic memory of a specified VAD instance.
+//
+// - handle [i] : Pointer to VAD instance that should be freed.
+void WebRtcVad_Free(VadInst* handle);
+
+// Initializes a VAD instance.
+//
+// - handle [i/o] : Instance that should be initialized.
+//
+// returns        : 0 - (OK),
+//                 -1 - (null pointer or Default mode could not be set).
+int WebRtcVad_Init(VadInst* handle);
+
+// Sets the VAD operating mode. A more aggressive (higher mode) VAD is more
+// restrictive in reporting speech. Put in other words the probability of being
+// speech when the VAD returns 1 is increased with increasing mode. As a
+// consequence also the missed detection rate goes up.
+//
+// - handle [i/o] : VAD instance.
+// - mode   [i]   : Aggressiveness mode (0, 1, 2, or 3).
+//
+// returns        : 0 - (OK),
+//                 -1 - (null pointer, mode could not be set or the VAD instance
+//                       has not been initialized).
+int WebRtcVad_set_mode(VadInst* handle, int mode);
+
+// Calculates a VAD decision for the |audio_frame|. For valid sampling rates
+// frame lengths, see the description of WebRtcVad_ValidRatesAndFrameLengths().
+//
+// - handle       [i/o] : VAD Instance. Needs to be initialized by
+//                        WebRtcVad_Init() before call.
+// - fs           [i]   : Sampling frequency (Hz): 8000, 16000, or 32000
+// - audio_frame  [i]   : Audio frame buffer.
+// - frame_length [i]   : Length of audio frame buffer in number of samples.
+//
+// returns              : 1 - (Active Voice),
+//                        0 - (Non-active Voice),
+//                       -1 - (Error)
+int WebRtcVad_Process(VadInst* handle,
+                      int fs,
+                      const int16_t* audio_frame,
+                      size_t frame_length);
+
+// Checks for valid combinations of |rate| and |frame_length|. We support 10,
+// 20 and 30 ms frames and the rates 8000, 16000 and 32000 Hz.
+//
+// - rate         [i] : Sampling frequency (Hz).
+// - frame_length [i] : Speech frame buffer length in number of samples.
+//
+// returns            : 0 - (valid combination), -1 - (invalid combination)
+int WebRtcVad_ValidRateAndFrameLength(int rate, size_t frame_length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // COMMON_AUDIO_VAD_INCLUDE_WEBRTC_VAD_H_  // NOLINT

cpp_onnx/include/win_func.h

+#include <time.h>
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <sys/time.h>
+#endif
+#ifdef WIN32
+int gettimeofday(struct timeval* tp, void* tzp)
+{
+	time_t clock;
+	struct tm tm;
+	SYSTEMTIME wtm;
+
+	GetLocalTime(&wtm);
+	tm.tm_year = wtm.wYear - 1900;
+	tm.tm_mon = wtm.wMonth - 1;
+	tm.tm_mday = wtm.wDay;
+	tm.tm_hour = wtm.wHour;
+	tm.tm_min = wtm.wMinute;
+	tm.tm_sec = wtm.wSecond;
+	tm.tm_isdst = -1;
+
+	clock = mktime(&tm);
+	tp->tv_sec = clock;
+	tp->tv_usec = wtm.wMilliseconds * 1000;
+	return (0);
+}
+#endif
\ No newline at end of file

cpp_onnx/src/CMakeLists.txt

+
+add_subdirectory(lib)

cpp_onnx/tester/CMakeLists.txt

+
+
+if(WIN32)
+    if(CMAKE_CL_64)
+        link_directories( ${CMAKE_SOURCE_DIR}/win/lib/x64 )
+    else()
+        link_directories( ${CMAKE_SOURCE_DIR}/win/lib/x86 )
+    endif()
+endif()
+
+set(EXTRA_LIBS rapidasr)
+
+
+include_directories(${CMAKE_SOURCE_DIR}/include)
+set(EXECNAME "tester")
+
+add_executable(${EXECNAME} "tester.cpp")
+target_link_libraries(${EXECNAME} PUBLIC onnxruntime ${EXTRA_LIBS})
+
+

cpp_onnx/tester/tester.cpp

+#include <iostream>
+#ifndef _WIN32
+#include <sys/time.h>
+#else
+#include <win_func.h>
+#endif
+
+#include <Audio.h>
+#include <Model.h>
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+
+    if (argc < 2)
+    {
+        printf("Usage: %s /path/to/model_dir /path/to/wav/file", argv[0]);
+        exit(-1);
+    }
+    struct timeval start, end;
+    Audio audio(0);
+    audio.loadwav(argv[2]);
+    audio.disp();
+    gettimeofday(&start, NULL);
+    Model *mm = create_model(argv[1], 3);
+    gettimeofday(&end, NULL);
+    long seconds = (end.tv_sec - start.tv_sec);
+    long micros = ((seconds * 1000000) + end.tv_usec) - (start.tv_usec);
+    printf("Model initialization takes %lfs.\n", (double)micros / 1000000);
+    audio.split();
+
+    setbuf(stdout, NULL);
+    cout << "Result: \"";
+    gettimeofday(&start, NULL);
+    float *buff;
+    int len;
+    int flag;
+    while (audio.fetch(buff, len, flag) > 0) {
+        mm->reset();
+        string msg = mm->forward(buff, len, flag);
+        cout << msg;
+    }
+
+    gettimeofday(&end, NULL);
+
+    cout << "\"." << endl;
+
+    seconds = (end.tv_sec - start.tv_sec);
+    micros = ((seconds * 1000000) + end.tv_usec) - (start.tv_usec);
+    printf("Model inference takes %lfs.\n", (double)micros / 1000000);
+    delete mm;
+
+    return 0;
+}

cpp_onnx/third_party/webrtc/CMakeLists.txt

+
+
+if(WIN32)
+    add_definitions(-DWEBRTC_WIN)
+else()
+    add_definitions(-DWEBRTC_POSIX)
+endif()
+
+
+include_directories("..")
+
+file(GLOB_RECURSE files "*.c" "rtc_base/checks.cc")
+
+message("${files}")
+
+add_library(webrtcvad ${files})

cpp_onnx/third_party/webrtc/common_audio/signal_processing/complex_bit_reverse.c

+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+/* Tables for data buffer indexes that are bit reversed and thus need to be
+ * swapped. Note that, index_7[{0, 2, 4, ...}] are for the left side of the swap
+ * operations, while index_7[{1, 3, 5, ...}] are for the right side of the
+ * operation. Same for index_8.
+ */
+
+/* Indexes for the case of stages == 7. */
+static const int16_t index_7[112] = {
+  1, 64, 2, 32, 3, 96, 4, 16, 5, 80, 6, 48, 7, 112, 9, 72, 10, 40, 11, 104,
+  12, 24, 13, 88, 14, 56, 15, 120, 17, 68, 18, 36, 19, 100, 21, 84, 22, 52,
+  23, 116, 25, 76, 26, 44, 27, 108, 29, 92, 30, 60, 31, 124, 33, 66, 35, 98,
+  37, 82, 38, 50, 39, 114, 41, 74, 43, 106, 45, 90, 46, 58, 47, 122, 49, 70,
+  51, 102, 53, 86, 55, 118, 57, 78, 59, 110, 61, 94, 63, 126, 67, 97, 69,
+  81, 71, 113, 75, 105, 77, 89, 79, 121, 83, 101, 87, 117, 91, 109, 95, 125,
+  103, 115, 111, 123
+};
+
+/* Indexes for the case of stages == 8. */
+static const int16_t index_8[240] = {
+  1, 128, 2, 64, 3, 192, 4, 32, 5, 160, 6, 96, 7, 224, 8, 16, 9, 144, 10, 80,
+  11, 208, 12, 48, 13, 176, 14, 112, 15, 240, 17, 136, 18, 72, 19, 200, 20,
+  40, 21, 168, 22, 104, 23, 232, 25, 152, 26, 88, 27, 216, 28, 56, 29, 184,
+  30, 120, 31, 248, 33, 132, 34, 68, 35, 196, 37, 164, 38, 100, 39, 228, 41,
+  148, 42, 84, 43, 212, 44, 52, 45, 180, 46, 116, 47, 244, 49, 140, 50, 76,
+  51, 204, 53, 172, 54, 108, 55, 236, 57, 156, 58, 92, 59, 220, 61, 188, 62,
+  124, 63, 252, 65, 130, 67, 194, 69, 162, 70, 98, 71, 226, 73, 146, 74, 82,
+  75, 210, 77, 178, 78, 114, 79, 242, 81, 138, 83, 202, 85, 170, 86, 106, 87,
+  234, 89, 154, 91, 218, 93, 186, 94, 122, 95, 250, 97, 134, 99, 198, 101,
+  166, 103, 230, 105, 150, 107, 214, 109, 182, 110, 118, 111, 246, 113, 142,
+  115, 206, 117, 174, 119, 238, 121, 158, 123, 222, 125, 190, 127, 254, 131,
+  193, 133, 161, 135, 225, 137, 145, 139, 209, 141, 177, 143, 241, 147, 201,
+  149, 169, 151, 233, 155, 217, 157, 185, 159, 249, 163, 197, 167, 229, 171,
+  213, 173, 181, 175, 245, 179, 205, 183, 237, 187, 221, 191, 253, 199, 227,
+  203, 211, 207, 243, 215, 235, 223, 251, 239, 247
+};
+
+void WebRtcSpl_ComplexBitReverse(int16_t* __restrict complex_data, int stages) {
+  /* For any specific value of stages, we know exactly the indexes that are
+   * bit reversed. Currently (Feb. 2012) in WebRTC the only possible values of
+   * stages are 7 and 8, so we use tables to save unnecessary iterations and
+   * calculations for these two cases.
+   */
+  if (stages == 7 || stages == 8) {
+    int m = 0;
+    int length = 112;
+    const int16_t* index = index_7;
+
+    if (stages == 8) {
+      length = 240;
+      index = index_8;
+    }
+
+    /* Decimation in time. Swap the elements with bit-reversed indexes. */
+    for (m = 0; m < length; m += 2) {
+      /* We declare a int32_t* type pointer, to load both the 16-bit real
+       * and imaginary elements from complex_data in one instruction, reducing
+       * complexity.
+       */
+      int32_t* complex_data_ptr = (int32_t*)complex_data;
+      int32_t temp = 0;
+
+      temp = complex_data_ptr[index[m]];  /* Real and imaginary */
+      complex_data_ptr[index[m]] = complex_data_ptr[index[m + 1]];
+      complex_data_ptr[index[m + 1]] = temp;
+    }
+  }
+  else {
+    int m = 0, mr = 0, l = 0;
+    int n = 1 << stages;
+    int nn = n - 1;
+
+    /* Decimation in time - re-order data */
+    for (m = 1; m <= nn; ++m) {
+      int32_t* complex_data_ptr = (int32_t*)complex_data;
+      int32_t temp = 0;
+
+      /* Find out indexes that are bit-reversed. */
+      l = n;
+      do {
+        l >>= 1;
+      } while (l > nn - mr);
+      mr = (mr & (l - 1)) + l;
+
+      if (mr <= m) {
+        continue;
+      }
+
+      /* Swap the elements with bit-reversed indexes.
+       * This is similar to the loop in the stages == 7 or 8 cases.
+       */
+      temp = complex_data_ptr[m];  /* Real and imaginary */
+      complex_data_ptr[m] = complex_data_ptr[mr];
+      complex_data_ptr[mr] = temp;
+    }
+  }
+}

cpp_onnx/third_party/webrtc/common_audio/signal_processing/complex_fft.c

+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_ComplexFFT().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "webrtc/common_audio/signal_processing/complex_fft_tables.h"
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+#include "webrtc/rtc_base/system/arch.h"
+
+#define CFFTSFT 14
+#define CFFTRND 1
+#define CFFTRND2 16384
+
+#define CIFFTSFT 14
+#define CIFFTRND 1
+
+
+int WebRtcSpl_ComplexFFT(int16_t frfi[], int stages, int mode)
+{
+    int i, j, l, k, istep, n, m;
+    int16_t wr, wi;
+    int32_t tr32, ti32, qr32, qi32;
+
+    /* The 1024-value is a constant given from the size of kSinTable1024[],
+     * and should not be changed depending on the input parameter 'stages'
+     */
+    n = 1 << stages;
+    if (n > 1024)
+        return -1;
+
+    l = 1;
+    k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
+         depending on the input parameter 'stages' */
+
+    if (mode == 0)
+    {
+        // mode==0: Low-complexity and Low-accuracy mode
+        while (l < n)
+        {
+            istep = l << 1;
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = -kSinTable1024[j];
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+                    tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
+
+                    ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
+
+                    qr32 = (int32_t)frfi[2 * i];
+                    qi32 = (int32_t)frfi[2 * i + 1];
+                    frfi[2 * j] = (int16_t)((qr32 - tr32) >> 1);
+                    frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> 1);
+                    frfi[2 * i] = (int16_t)((qr32 + tr32) >> 1);
+                    frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> 1);
+                }
+            }
+
+            --k;
+            l = istep;
+
+        }
+
+    } else
+    {
+        // mode==1: High-complexity and High-accuracy mode
+        while (l < n)
+        {
+            istep = l << 1;
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = -kSinTable1024[j];
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                int32_t wri = 0;
+                __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
+                    "r"((int32_t)wr), "r"((int32_t)wi));
+#endif
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                    register int32_t frfi_r;
+                    __asm __volatile(
+                        "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd],"
+                        " lsl #16\n\t"
+                        "smlsd %[tr32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
+                        "smladx %[ti32], %[wri], %[frfi_r], %[cfftrnd]\n\t"
+                        :[frfi_r]"=&r"(frfi_r),
+                         [tr32]"=&r"(tr32),
+                         [ti32]"=r"(ti32)
+                        :[frfi_even]"r"((int32_t)frfi[2*j]),
+                         [frfi_odd]"r"((int32_t)frfi[2*j +1]),
+                         [wri]"r"(wri),
+                         [cfftrnd]"r"(CFFTRND));
+#else
+                    tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CFFTRND;
+
+                    ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CFFTRND;
+#endif
+
+                    tr32 >>= 15 - CFFTSFT;
+                    ti32 >>= 15 - CFFTSFT;
+
+                    qr32 = ((int32_t)frfi[2 * i]) * (1 << CFFTSFT);
+                    qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CFFTSFT);
+
+                    frfi[2 * j] = (int16_t)(
+                        (qr32 - tr32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * j + 1] = (int16_t)(
+                        (qi32 - ti32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * i] = (int16_t)(
+                        (qr32 + tr32 + CFFTRND2) >> (1 + CFFTSFT));
+                    frfi[2 * i + 1] = (int16_t)(
+                        (qi32 + ti32 + CFFTRND2) >> (1 + CFFTSFT));
+                }
+            }
+
+            --k;
+            l = istep;
+        }
+    }
+    return 0;
+}
+
+int WebRtcSpl_ComplexIFFT(int16_t frfi[], int stages, int mode)
+{
+    size_t i, j, l, istep, n, m;
+    int k, scale, shift;
+    int16_t wr, wi;
+    int32_t tr32, ti32, qr32, qi32;
+    int32_t tmp32, round2;
+
+    /* The 1024-value is a constant given from the size of kSinTable1024[],
+     * and should not be changed depending on the input parameter 'stages'
+     */
+    n = ((size_t)1) << stages;
+    if (n > 1024)
+        return -1;
+
+    scale = 0;
+
+    l = 1;
+    k = 10 - 1; /* Constant for given kSinTable1024[]. Do not change
+         depending on the input parameter 'stages' */
+
+    while (l < n)
+    {
+        // variable scaling, depending upon data
+        shift = 0;
+        round2 = 8192;
+
+        tmp32 = WebRtcSpl_MaxAbsValueW16(frfi, 2 * n);
+        if (tmp32 > 13573)
+        {
+            shift++;
+            scale++;
+            round2 <<= 1;
+        }
+        if (tmp32 > 27146)
+        {
+            shift++;
+            scale++;
+            round2 <<= 1;
+        }
+
+        istep = l << 1;
+
+        if (mode == 0)
+        {
+            // mode==0: Low-complexity and Low-accuracy mode
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = kSinTable1024[j];
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+                    tr32 = (wr * frfi[2 * j] - wi * frfi[2 * j + 1]) >> 15;
+
+                    ti32 = (wr * frfi[2 * j + 1] + wi * frfi[2 * j]) >> 15;
+
+                    qr32 = (int32_t)frfi[2 * i];
+                    qi32 = (int32_t)frfi[2 * i + 1];
+                    frfi[2 * j] = (int16_t)((qr32 - tr32) >> shift);
+                    frfi[2 * j + 1] = (int16_t)((qi32 - ti32) >> shift);
+                    frfi[2 * i] = (int16_t)((qr32 + tr32) >> shift);
+                    frfi[2 * i + 1] = (int16_t)((qi32 + ti32) >> shift);
+                }
+            }
+        } else
+        {
+            // mode==1: High-complexity and High-accuracy mode
+
+            for (m = 0; m < l; ++m)
+            {
+                j = m << k;
+
+                /* The 256-value is a constant given as 1/4 of the size of
+                 * kSinTable1024[], and should not be changed depending on the input
+                 * parameter 'stages'. It will result in 0 <= j < N_SINE_WAVE/2
+                 */
+                wr = kSinTable1024[j + 256];
+                wi = kSinTable1024[j];
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                int32_t wri = 0;
+                __asm __volatile("pkhbt %0, %1, %2, lsl #16" : "=r"(wri) :
+                    "r"((int32_t)wr), "r"((int32_t)wi));
+#endif
+
+                for (i = m; i < n; i += istep)
+                {
+                    j = i + l;
+
+#ifdef WEBRTC_ARCH_ARM_V7
+                    register int32_t frfi_r;
+                    __asm __volatile(
+                      "pkhbt %[frfi_r], %[frfi_even], %[frfi_odd], lsl #16\n\t"
+                      "smlsd %[tr32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
+                      "smladx %[ti32], %[wri], %[frfi_r], %[cifftrnd]\n\t"
+                      :[frfi_r]"=&r"(frfi_r),
+                       [tr32]"=&r"(tr32),
+                       [ti32]"=r"(ti32)
+                      :[frfi_even]"r"((int32_t)frfi[2*j]),
+                       [frfi_odd]"r"((int32_t)frfi[2*j +1]),
+                       [wri]"r"(wri),
+                       [cifftrnd]"r"(CIFFTRND)
+                    );
+#else
+
+                    tr32 = wr * frfi[2 * j] - wi * frfi[2 * j + 1] + CIFFTRND;
+
+                    ti32 = wr * frfi[2 * j + 1] + wi * frfi[2 * j] + CIFFTRND;
+#endif
+                    tr32 >>= 15 - CIFFTSFT;
+                    ti32 >>= 15 - CIFFTSFT;
+
+                    qr32 = ((int32_t)frfi[2 * i]) * (1 << CIFFTSFT);
+                    qi32 = ((int32_t)frfi[2 * i + 1]) * (1 << CIFFTSFT);
+
+                    frfi[2 * j] = (int16_t)(
+                        (qr32 - tr32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * j + 1] = (int16_t)(
+                        (qi32 - ti32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * i] = (int16_t)(
+                        (qr32 + tr32 + round2) >> (shift + CIFFTSFT));
+                    frfi[2 * i + 1] = (int16_t)(
+                        (qi32 + ti32 + round2) >> (shift + CIFFTSFT));
+                }
+            }
+
+        }
+        --k;
+        l = istep;
+    }
+    return scale;
+}

cpp_onnx/third_party/webrtc/common_audio/signal_processing/complex_fft_tables.h

+/*
+ *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_
+
+#include <stdint.h>
+
+static const int16_t kSinTable1024[] = {
+    0,      201,    402,    603,    804,    1005,   1206,   1406,   1607,
+    1808,   2009,   2209,   2410,   2610,   2811,   3011,   3211,   3411,
+    3611,   3811,   4011,   4210,   4409,   4608,   4807,   5006,   5205,
+    5403,   5601,   5799,   5997,   6195,   6392,   6589,   6786,   6982,
+    7179,   7375,   7571,   7766,   7961,   8156,   8351,   8545,   8739,
+    8932,   9126,   9319,   9511,   9703,   9895,   10087,  10278,  10469,
+    10659,  10849,  11038,  11227,  11416,  11604,  11792,  11980,  12166,
+    12353,  12539,  12724,  12909,  13094,  13278,  13462,  13645,  13827,
+    14009,  14191,  14372,  14552,  14732,  14911,  15090,  15268,  15446,
+    15623,  15799,  15975,  16150,  16325,  16499,  16672,  16845,  17017,
+    17189,  17360,  17530,  17699,  17868,  18036,  18204,  18371,  18537,
+    18702,  18867,  19031,  19194,  19357,  19519,  19680,  19840,  20000,
+    20159,  20317,  20474,  20631,  20787,  20942,  21096,  21249,  21402,
+    21554,  21705,  21855,  22004,  22153,  22301,  22448,  22594,  22739,
+    22883,  23027,  23169,  23311,  23452,  23592,  23731,  23869,  24006,
+    24143,  24278,  24413,  24546,  24679,  24811,  24942,  25072,  25201,
+    25329,  25456,  25582,  25707,  25831,  25954,  26077,  26198,  26318,
+    26437,  26556,  26673,  26789,  26905,  27019,  27132,  27244,  27355,
+    27466,  27575,  27683,  27790,  27896,  28001,  28105,  28208,  28309,
+    28410,  28510,  28608,  28706,  28802,  28897,  28992,  29085,  29177,
+    29268,  29358,  29446,  29534,  29621,  29706,  29790,  29873,  29955,
+    30036,  30116,  30195,  30272,  30349,  30424,  30498,  30571,  30643,
+    30713,  30783,  30851,  30918,  30984,  31049,  31113,  31175,  31236,
+    31297,  31356,  31413,  31470,  31525,  31580,  31633,  31684,  31735,
+    31785,  31833,  31880,  31926,  31970,  32014,  32056,  32097,  32137,
+    32176,  32213,  32249,  32284,  32318,  32350,  32382,  32412,  32441,
+    32468,  32495,  32520,  32544,  32567,  32588,  32609,  32628,  32646,
+    32662,  32678,  32692,  32705,  32717,  32727,  32736,  32744,  32751,
+    32757,  32761,  32764,  32766,  32767,  32766,  32764,  32761,  32757,
+    32751,  32744,  32736,  32727,  32717,  32705,  32692,  32678,  32662,
+    32646,  32628,  32609,  32588,  32567,  32544,  32520,  32495,  32468,
+    32441,  32412,  32382,  32350,  32318,  32284,  32249,  32213,  32176,
+    32137,  32097,  32056,  32014,  31970,  31926,  31880,  31833,  31785,
+    31735,  31684,  31633,  31580,  31525,  31470,  31413,  31356,  31297,
+    31236,  31175,  31113,  31049,  30984,  30918,  30851,  30783,  30713,
+    30643,  30571,  30498,  30424,  30349,  30272,  30195,  30116,  30036,
+    29955,  29873,  29790,  29706,  29621,  29534,  29446,  29358,  29268,
+    29177,  29085,  28992,  28897,  28802,  28706,  28608,  28510,  28410,
+    28309,  28208,  28105,  28001,  27896,  27790,  27683,  27575,  27466,
+    27355,  27244,  27132,  27019,  26905,  26789,  26673,  26556,  26437,
+    26318,  26198,  26077,  25954,  25831,  25707,  25582,  25456,  25329,
+    25201,  25072,  24942,  24811,  24679,  24546,  24413,  24278,  24143,
+    24006,  23869,  23731,  23592,  23452,  23311,  23169,  23027,  22883,
+    22739,  22594,  22448,  22301,  22153,  22004,  21855,  21705,  21554,
+    21402,  21249,  21096,  20942,  20787,  20631,  20474,  20317,  20159,
+    20000,  19840,  19680,  19519,  19357,  19194,  19031,  18867,  18702,
+    18537,  18371,  18204,  18036,  17868,  17699,  17530,  17360,  17189,
+    17017,  16845,  16672,  16499,  16325,  16150,  15975,  15799,  15623,
+    15446,  15268,  15090,  14911,  14732,  14552,  14372,  14191,  14009,
+    13827,  13645,  13462,  13278,  13094,  12909,  12724,  12539,  12353,
+    12166,  11980,  11792,  11604,  11416,  11227,  11038,  10849,  10659,
+    10469,  10278,  10087,  9895,   9703,   9511,   9319,   9126,   8932,
+    8739,   8545,   8351,   8156,   7961,   7766,   7571,   7375,   7179,
+    6982,   6786,   6589,   6392,   6195,   5997,   5799,   5601,   5403,
+    5205,   5006,   4807,   4608,   4409,   4210,   4011,   3811,   3611,
+    3411,   3211,   3011,   2811,   2610,   2410,   2209,   2009,   1808,
+    1607,   1406,   1206,   1005,   804,    603,    402,    201,    0,
+    -201,   -402,   -603,   -804,   -1005,  -1206,  -1406,  -1607,  -1808,
+    -2009,  -2209,  -2410,  -2610,  -2811,  -3011,  -3211,  -3411,  -3611,
+    -3811,  -4011,  -4210,  -4409,  -4608,  -4807,  -5006,  -5205,  -5403,
+    -5601,  -5799,  -5997,  -6195,  -6392,  -6589,  -6786,  -6982,  -7179,
+    -7375,  -7571,  -7766,  -7961,  -8156,  -8351,  -8545,  -8739,  -8932,
+    -9126,  -9319,  -9511,  -9703,  -9895,  -10087, -10278, -10469, -10659,
+    -10849, -11038, -11227, -11416, -11604, -11792, -11980, -12166, -12353,
+    -12539, -12724, -12909, -13094, -13278, -13462, -13645, -13827, -14009,
+    -14191, -14372, -14552, -14732, -14911, -15090, -15268, -15446, -15623,
+    -15799, -15975, -16150, -16325, -16499, -16672, -16845, -17017, -17189,
+    -17360, -17530, -17699, -17868, -18036, -18204, -18371, -18537, -18702,
+    -18867, -19031, -19194, -19357, -19519, -19680, -19840, -20000, -20159,
+    -20317, -20474, -20631, -20787, -20942, -21096, -21249, -21402, -21554,
+    -21705, -21855, -22004, -22153, -22301, -22448, -22594, -22739, -22883,
+    -23027, -23169, -23311, -23452, -23592, -23731, -23869, -24006, -24143,
+    -24278, -24413, -24546, -24679, -24811, -24942, -25072, -25201, -25329,
+    -25456, -25582, -25707, -25831, -25954, -26077, -26198, -26318, -26437,
+    -26556, -26673, -26789, -26905, -27019, -27132, -27244, -27355, -27466,
+    -27575, -27683, -27790, -27896, -28001, -28105, -28208, -28309, -28410,
+    -28510, -28608, -28706, -28802, -28897, -28992, -29085, -29177, -29268,
+    -29358, -29446, -29534, -29621, -29706, -29790, -29873, -29955, -30036,
+    -30116, -30195, -30272, -30349, -30424, -30498, -30571, -30643, -30713,
+    -30783, -30851, -30918, -30984, -31049, -31113, -31175, -31236, -31297,
+    -31356, -31413, -31470, -31525, -31580, -31633, -31684, -31735, -31785,
+    -31833, -31880, -31926, -31970, -32014, -32056, -32097, -32137, -32176,
+    -32213, -32249, -32284, -32318, -32350, -32382, -32412, -32441, -32468,
+    -32495, -32520, -32544, -32567, -32588, -32609, -32628, -32646, -32662,
+    -32678, -32692, -32705, -32717, -32727, -32736, -32744, -32751, -32757,
+    -32761, -32764, -32766, -32767, -32766, -32764, -32761, -32757, -32751,
+    -32744, -32736, -32727, -32717, -32705, -32692, -32678, -32662, -32646,
+    -32628, -32609, -32588, -32567, -32544, -32520, -32495, -32468, -32441,
+    -32412, -32382, -32350, -32318, -32284, -32249, -32213, -32176, -32137,
+    -32097, -32056, -32014, -31970, -31926, -31880, -31833, -31785, -31735,
+    -31684, -31633, -31580, -31525, -31470, -31413, -31356, -31297, -31236,
+    -31175, -31113, -31049, -30984, -30918, -30851, -30783, -30713, -30643,
+    -30571, -30498, -30424, -30349, -30272, -30195, -30116, -30036, -29955,
+    -29873, -29790, -29706, -29621, -29534, -29446, -29358, -29268, -29177,
+    -29085, -28992, -28897, -28802, -28706, -28608, -28510, -28410, -28309,
+    -28208, -28105, -28001, -27896, -27790, -27683, -27575, -27466, -27355,
+    -27244, -27132, -27019, -26905, -26789, -26673, -26556, -26437, -26318,
+    -26198, -26077, -25954, -25831, -25707, -25582, -25456, -25329, -25201,
+    -25072, -24942, -24811, -24679, -24546, -24413, -24278, -24143, -24006,
+    -23869, -23731, -23592, -23452, -23311, -23169, -23027, -22883, -22739,
+    -22594, -22448, -22301, -22153, -22004, -21855, -21705, -21554, -21402,
+    -21249, -21096, -20942, -20787, -20631, -20474, -20317, -20159, -20000,
+    -19840, -19680, -19519, -19357, -19194, -19031, -18867, -18702, -18537,
+    -18371, -18204, -18036, -17868, -17699, -17530, -17360, -17189, -17017,
+    -16845, -16672, -16499, -16325, -16150, -15975, -15799, -15623, -15446,
+    -15268, -15090, -14911, -14732, -14552, -14372, -14191, -14009, -13827,
+    -13645, -13462, -13278, -13094, -12909, -12724, -12539, -12353, -12166,
+    -11980, -11792, -11604, -11416, -11227, -11038, -10849, -10659, -10469,
+    -10278, -10087, -9895,  -9703,  -9511,  -9319,  -9126,  -8932,  -8739,
+    -8545,  -8351,  -8156,  -7961,  -7766,  -7571,  -7375,  -7179,  -6982,
+    -6786,  -6589,  -6392,  -6195,  -5997,  -5799,  -5601,  -5403,  -5205,
+    -5006,  -4807,  -4608,  -4409,  -4210,  -4011,  -3811,  -3611,  -3411,
+    -3211,  -3011,  -2811,  -2610,  -2410,  -2209,  -2009,  -1808,  -1607,
+    -1406,  -1206,  -1005,  -804,   -603,   -402,   -201};
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_COMPLEX_FFT_TABLES_H_

cpp_onnx/third_party/webrtc/common_audio/signal_processing/cross_correlation.c

+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+/* C version of WebRtcSpl_CrossCorrelation() for generic platforms. */
+void WebRtcSpl_CrossCorrelationC(int32_t* cross_correlation,
+                                 const int16_t* seq1,
+                                 const int16_t* seq2,
+                                 size_t dim_seq,
+                                 size_t dim_cross_correlation,
+                                 int right_shifts,
+                                 int step_seq2) {
+  size_t i = 0, j = 0;
+
+  for (i = 0; i < dim_cross_correlation; i++) {
+    int32_t corr = 0;
+    for (j = 0; j < dim_seq; j++)
+      corr += (seq1[j] * seq2[j]) >> right_shifts;
+    seq2 += step_seq2;
+    *cross_correlation++ = corr;
+  }
+}

cpp_onnx/third_party/webrtc/common_audio/signal_processing/division_operations.c

+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains implementations of the divisions
+ * WebRtcSpl_DivU32U16()
+ * WebRtcSpl_DivW32W16()
+ * WebRtcSpl_DivW32W16ResW16()
+ * WebRtcSpl_DivResultInQ31()
+ * WebRtcSpl_DivW32HiLow()
+ *
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+#include "webrtc/rtc_base/sanitizer.h"
+
+uint32_t WebRtcSpl_DivU32U16(uint32_t num, uint16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (uint32_t)(num / den);
+    } else
+    {
+        return (uint32_t)0xFFFFFFFF;
+    }
+}
+
+int32_t WebRtcSpl_DivW32W16(int32_t num, int16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (int32_t)(num / den);
+    } else
+    {
+        return (int32_t)0x7FFFFFFF;
+    }
+}
+
+int16_t WebRtcSpl_DivW32W16ResW16(int32_t num, int16_t den)
+{
+    // Guard against division with 0
+    if (den != 0)
+    {
+        return (int16_t)(num / den);
+    } else
+    {
+        return (int16_t)0x7FFF;
+    }
+}
+
+int32_t WebRtcSpl_DivResultInQ31(int32_t num, int32_t den)
+{
+    int32_t L_num = num;
+    int32_t L_den = den;
+    int32_t div = 0;
+    int k = 31;
+    int change_sign = 0;
+
+    if (num == 0)
+        return 0;
+
+    if (num < 0)
+    {
+        change_sign++;
+        L_num = -num;
+    }
+    if (den < 0)
+    {
+        change_sign++;
+        L_den = -den;
+    }
+    while (k--)
+    {
+        div <<= 1;
+        L_num <<= 1;
+        if (L_num >= L_den)
+        {
+            L_num -= L_den;
+            div++;
+        }
+    }
+    if (change_sign == 1)
+    {
+        div = -div;
+    }
+    return div;
+}
+
+int32_t RTC_NO_SANITIZE("signed-integer-overflow")  // bugs.webrtc.org/5486
+WebRtcSpl_DivW32HiLow(int32_t num, int16_t den_hi, int16_t den_low)
+{
+    int16_t approx, tmp_hi, tmp_low, num_hi, num_low;
+    int32_t tmpW32;
+
+    approx = (int16_t)WebRtcSpl_DivW32W16((int32_t)0x1FFFFFFF, den_hi);
+    // result in Q14 (Note: 3FFFFFFF = 0.5 in Q30)
+
+    // tmpW32 = 1/den = approx * (2.0 - den * approx) (in Q30)
+    tmpW32 = (den_hi * approx << 1) + ((den_low * approx >> 15) << 1);
+    // tmpW32 = den * approx
+
+    tmpW32 = (int32_t)0x7fffffffL - tmpW32; // result in Q30 (tmpW32 = 2.0-(den*approx))
+    // UBSan: 2147483647 - -2 cannot be represented in type 'int'
+
+    // Store tmpW32 in hi and low format
+    tmp_hi = (int16_t)(tmpW32 >> 16);
+    tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+    // tmpW32 = 1/den in Q29
+    tmpW32 = (tmp_hi * approx + (tmp_low * approx >> 15)) << 1;
+
+    // 1/den in hi and low format
+    tmp_hi = (int16_t)(tmpW32 >> 16);
+    tmp_low = (int16_t)((tmpW32 - ((int32_t)tmp_hi << 16)) >> 1);
+
+    // Store num in hi and low format
+    num_hi = (int16_t)(num >> 16);
+    num_low = (int16_t)((num - ((int32_t)num_hi << 16)) >> 1);
+
+    // num * (1/den) by 32 bit multiplication (result in Q28)
+
+    tmpW32 = num_hi * tmp_hi + (num_hi * tmp_low >> 15) +
+        (num_low * tmp_hi >> 15);
+
+    // Put result in Q31 (convert from Q28)
+    tmpW32 = WEBRTC_SPL_LSHIFT_W32(tmpW32, 3);
+
+    return tmpW32;
+}

cpp_onnx/third_party/webrtc/common_audio/signal_processing/dot_product_with_scale.cc

+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/common_audio/signal_processing/dot_product_with_scale.h"
+
+#include "webrtc/rtc_base/numerics/safe_conversions.h"
+
+int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
+                                      const int16_t* vector2,
+                                      size_t length,
+                                      int scaling) {
+  int64_t sum = 0;
+  size_t i = 0;
+
+  /* Unroll the loop to improve performance. */
+  for (i = 0; i + 3 < length; i += 4) {
+    sum += (vector1[i + 0] * vector2[i + 0]) >> scaling;
+    sum += (vector1[i + 1] * vector2[i + 1]) >> scaling;
+    sum += (vector1[i + 2] * vector2[i + 2]) >> scaling;
+    sum += (vector1[i + 3] * vector2[i + 3]) >> scaling;
+  }
+  for (; i < length; i++) {
+    sum += (vector1[i] * vector2[i]) >> scaling;
+  }
+
+  return rtc::saturated_cast<int32_t>(sum);
+}

cpp_onnx/third_party/webrtc/common_audio/signal_processing/dot_product_with_scale.h

+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_
+
+#include <stdint.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Calculates the dot product between two (int16_t) vectors.
+//
+// Input:
+//      - vector1       : Vector 1
+//      - vector2       : Vector 2
+//      - vector_length : Number of samples used in the dot product
+//      - scaling       : The number of right bit shifts to apply on each term
+//                        during calculation to avoid overflow, i.e., the
+//                        output will be in Q(-|scaling|)
+//
+// Return value         : The dot product in Q(-scaling)
+int32_t WebRtcSpl_DotProductWithScale(const int16_t* vector1,
+                                      const int16_t* vector2,
+                                      size_t length,
+                                      int scaling);
+
+#ifdef __cplusplus
+}
+#endif  // __cplusplus
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_DOT_PRODUCT_WITH_SCALE_H_

cpp_onnx/third_party/webrtc/common_audio/signal_processing/downsample_fast.c

+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/common_audio/signal_processing/include/signal_processing_library.h"
+
+#include "webrtc/rtc_base/checks.h"
+#include "webrtc/rtc_base/sanitizer.h"
+
+// TODO(Bjornv): Change the function parameter order to WebRTC code style.
+// C version of WebRtcSpl_DownsampleFast() for generic platforms.
+int WebRtcSpl_DownsampleFastC(const int16_t* data_in,
+                              size_t data_in_length,
+                              int16_t* data_out,
+                              size_t data_out_length,
+                              const int16_t* __restrict coefficients,
+                              size_t coefficients_length,
+                              int factor,
+                              size_t delay) {
+  int16_t* const original_data_out = data_out;
+  size_t i = 0;
+  size_t j = 0;
+  int32_t out_s32 = 0;
+  size_t endpos = delay + factor * (data_out_length - 1) + 1;
+
+  // Return error if any of the running conditions doesn't meet.
+  if (data_out_length == 0 || coefficients_length == 0
+                           || data_in_length < endpos) {
+    return -1;
+  }
+
+  rtc_MsanCheckInitialized(coefficients, sizeof(coefficients[0]),
+                           coefficients_length);
+
+  for (i = delay; i < endpos; i += factor) {
+    out_s32 = 2048;  // Round value, 0.5 in Q12.
+
+    for (j = 0; j < coefficients_length; j++) {
+      // Negative overflow is permitted here, because this is
+      // auto-regressive filters, and the state for each batch run is
+      // stored in the "negative" positions of the output vector.
+      rtc_MsanCheckInitialized(&data_in[(ptrdiff_t) i - (ptrdiff_t) j],
+          sizeof(data_in[0]), 1);
+      // out_s32 is in Q12 domain.
+      out_s32 += coefficients[j] * data_in[(ptrdiff_t) i - (ptrdiff_t) j];
+    }
+
+    out_s32 >>= 12;  // Q0.
+
+    // Saturate and store the output.
+    *data_out++ = WebRtcSpl_SatW32ToW16(out_s32);
+  }
+
+  RTC_DCHECK_EQ(original_data_out + data_out_length, data_out);
+  rtc_MsanCheckInitialized(original_data_out, sizeof(original_data_out[0]),
+                           data_out_length);
+
+  return 0;
+}