add code.

Record/CMakeLists.txt

@@ -37,6 +37,7 @@ target_link_directories(Record
 
 target_link_libraries(Record
     PRIVATE VocieProcess
+    PRIVATE absl::optional
     PRIVATE asound
     PRIVATE easymedia
     PRIVATE drm

Record/EchoRecord.cpp

@@ -2,12 +2,41 @@
 #include "SpeexDsp.h"
 #include "Utility.h"
 #include "WebRtcAecm.h"
+#include "api/audio/echo_canceller3_config.h"
+#include "api/audio/echo_canceller3_factory.h"
 #include "main.h"
+#include "modules/audio_processing/aec3/echo_canceller3.h"
 #include <memory>
 
-void EchoRecordTask::setVqeEnabled(bool enabled) {
+class EchoRecordPrivate {
-    if (m_vqeEnabled != enabled) {
+public:
-        m_vqeEnabled = enabled;
+    EchoRecordPrivate() {
+
+        std::unique_ptr<webrtc::EchoCanceller3Factory> factory = std::make_unique<webrtc::EchoCanceller3Factory>();
+
+        echoCanceller = factory->Create(16000, 1, 1);
+
+        // nearendBuffer = std::make_unique<webrtc::AudioBuffer>(16000, 1, 16000, 1, 16000, 1);
+        // farendBuffer = std::make_unique<webrtc::AudioBuffer>(16000, 1, 16000, 1, 16000, 1);
+    }
+
+    std::unique_ptr<webrtc::EchoControl> echoCanceller;
+    // std::unique_ptr<webrtc::AudioBuffer> nearendBuffer;
+    // std::unique_ptr<webrtc::AudioBuffer> farendBuffer;
+};
+
+EchoRecordTask::EchoRecordTask() : m_d{new EchoRecordPrivate()} {
+}
+
+EchoRecordTask::~EchoRecordTask() {
+    if (m_d != nullptr) {
+        delete m_d;
+    }
+}
+
+void EchoRecordTask::setDsp(Dsp dsp) {
+    if (m_dsp != dsp) {
+        m_dsp = dsp;
     }
 }
 
@@ -23,10 +52,11 @@ void EchoRecordTask::setChannels(int channels) {
 // ./Record --echo --vqe=true --channels=2
 // ./Record --echo --vqe=false --channels=1
 void EchoRecordTask::run() {
+    LOG(info) << "dsp use: " << dspToString(m_dsp);
 
     RkAudio::Format format;
     format.channels = m_channels;
-    format.period = 10;
+    format.period = 20;
 
     m_speex = std::make_shared<SpeexDsp>();
     m_speex->start(format.sampleRate, m_channels, format.period);
@@ -37,7 +67,7 @@ void EchoRecordTask::run() {
     m_webRtcAecm->start(format.sampleRate, format.channels, format.period);
 
     m_output = std::make_shared<RkAudio::Output>();
-    if (!m_output->open(sizeof(uint16_t), format.sampleRate, 2, format.period, m_vqeEnabled)) {
+    if (!m_output->open(sizeof(uint16_t), format.sampleRate, 2, format.period, m_dsp == Vqe)) {
         LOG(error) << "audio output open failed.";
         return;
     }
@@ -45,16 +75,31 @@ void EchoRecordTask::run() {
     m_outBuffer.resize(m_channels * sizeof(int16_t) * format.sampleRate / 1000 * format.period);
 
     m_input = std::make_shared<RkAudio::Input>();
-    m_input->setDataCallback([this](const RkAudio::Frame &frame) {
+    m_input->setDataCallback([this, format](const RkAudio::Frame &frame) {
         memcpy(m_nearendBuffer.data(), frame.data, frame.byteSize);
+        if (m_dsp == Speex) {
+            m_speex->echoPlayback(reinterpret_cast<const int16_t *>(m_farendBuffer.data()));
+            m_speex->echoCapture(reinterpret_cast<const int16_t *>(frame.data), reinterpret_cast<int16_t *>(m_outBuffer.data()));
+        } else if (m_dsp == AecMobile) {
             m_webRtcAecm->echoPlayback(reinterpret_cast<const int16_t *>(m_farendBuffer.data()), m_farendBuffer.size() / 2);
 
             m_webRtcAecm->echoCancellation(reinterpret_cast<int16_t *>(frame.data), reinterpret_cast<int16_t *>(m_nearendBuffer.data()),
                                            reinterpret_cast<int16_t *>(m_outBuffer.data()), frame.frameSize);
-        // m_speex->echoPlayback(reinterpret_cast<const int16_t *>(frame.data));
+        } else if (m_dsp == Aec3) {
-        // m_speex->echoPlayback(reinterpret_cast<const int16_t *>(m_buffer.data()));
+            webrtc::StreamConfig config(format.sampleRate, format.channels); // 单声道
+            webrtc::AudioBuffer nearendBuffer(format.sampleRate, 1, format.sampleRate, 1, format.sampleRate, 1);
+            webrtc::AudioBuffer farendBuffer(format.sampleRate, 1, format.sampleRate, 1, format.sampleRate, 1);
+            webrtc::AudioBuffer linearOutputBuffer(format.sampleRate, 1, format.sampleRate, 1, format.sampleRate, 1);
+            nearendBuffer.CopyFrom(reinterpret_cast<const int16_t *>(frame.data), config);
 
-        // m_speex->echoCapture(reinterpret_cast<const int16_t *>(frame.data), reinterpret_cast<int16_t *>(m_buffer.data()));
+            farendBuffer.CopyFrom(reinterpret_cast<const int16_t *>(m_farendBuffer.data()), config);
+
+            m_d->echoCanceller->AnalyzeRender(&farendBuffer);
+            m_d->echoCanceller->AnalyzeCapture(&nearendBuffer);
+            m_d->echoCanceller->ProcessCapture(&nearendBuffer, &linearOutputBuffer, /*level_change=*/false);
+
+            linearOutputBuffer.CopyTo(config, reinterpret_cast<int16_t *>(m_outBuffer.data()));
+        }
 
         if (m_channels == 2) {
             m_output->write(frame.data, frame.byteSize);
@@ -66,5 +111,5 @@ void EchoRecordTask::run() {
         // m_output->write(reinterpret_cast<const uint8_t *>(m_buffer.data()), m_buffer.size());
     });
 
-    m_input->open(format, m_vqeEnabled);
+    m_input->open(format, m_dsp == Vqe);
 }

Record/main.cpp

@@ -15,12 +15,6 @@
 #include <fstream>
 #include <rkmedia/rkmedia_api.h>
 
-extern void rkDemo();
-extern int AI_VqeProcess_AO();
-extern int AI_VqeProcess_AO1();
-extern void AecTest();
-extern int opus_test();
-
 void signal_handler(const boost::system::error_code &error, int signal_number) {
     if (!error) {
         LOG(info) << "Caught signal: " << signal_number << std::endl;
@@ -40,7 +34,7 @@ int main(int argc, char **argv) {
         ("echo", "Self-recording and self-play test")
         ("record", "Record to file.")
         ("play", "Play pcm file.")
-        ("vqe", boost::program_options::value<bool>(), "Enable rk 3a.")
+        ("dsp", boost::program_options::value<std::string>(), "vqe, speex, aecm")
         ("channels", boost::program_options::value<int>(), "set audio channles")
         ("path", boost::program_options::value<std::string>(), "file path")
     ;
@@ -57,9 +51,9 @@ int main(int argc, char **argv) {
 
     std::shared_ptr<Task> task;
     if (variablesMap.count("echo")) {
-        bool vqe = false;
+        Dsp dsp = Vqe;
-        if (variablesMap.count("vqe")) {
+        if (variablesMap.count("dsp")) {
-            vqe = variablesMap["vqe"].as<bool>();
+            dsp = dspFromString(variablesMap["dsp"].as<std::string>());
         }
 
         int channels = 2;
@@ -68,7 +62,7 @@ int main(int argc, char **argv) {
         }
 
         auto t = std::make_shared<EchoRecordTask>();
-        t->setVqeEnabled(vqe);
+        t->setDsp(dsp);
         t->setChannels(channels);
         task = std::dynamic_pointer_cast<Task>(t);
     } else if (variablesMap.count("record")) {
@@ -115,3 +109,29 @@ int main(int argc, char **argv) {
     // publisher.start("172.16.103.68", "443", "/index/api/webrtc?app=live&stream=test&type=push");
     return 0;
 }
+
+Dsp dspFromString(const std::string &dsp) {
+    Dsp ret = Vqe;
+    if (dsp == "speex") {
+        ret = Speex;
+    } else if (dsp == "aecm") {
+        ret = AecMobile;
+    }else if (dsp == "aec3") {
+        ret = Aec3;
+    }
+    return ret;
+}
+
+std::string dspToString(Dsp dsp) {
+    std::string ret = "none";
+    if (dsp == Vqe) {
+        ret = "vqe";
+    } else if (dsp == Speex) {
+        ret = "speex";
+    } else if (dsp == AecMobile) {
+        ret = "aecm";
+    } else if (dsp == Aec3) {
+        ret = "aec3";
+    }
+    return ret;
+}

Record/main.h

@@ -7,9 +7,19 @@
 
 class SpeexDsp;
 class WebRtcAecm;
+
+enum Dsp {
+    Vqe,
+    Speex,
+    AecMobile,
+    Aec3,
+};
+
 class Task {
 public:
     virtual void run() = 0;
+    virtual ~Task() {
+    }
 };
 
 class RecorderTask : public Task {
@@ -38,15 +48,18 @@ private:
     std::shared_ptr<RkAudio::Output> m_output;
 };
 
+class EchoRecordPrivate;
 class EchoRecordTask : public Task {
 public:
-    void setVqeEnabled(bool enabled);
+    EchoRecordTask();
+    ~EchoRecordTask();
+    void setDsp(Dsp dsp);
     void setChannels(int channels);
     void run() final;
 
 private:
     int m_channels = 2;
-    bool m_vqeEnabled = false;
+    Dsp m_dsp = Vqe;
     std::shared_ptr<RkAudio::Output> m_output;
     std::shared_ptr<RkAudio::Input> m_input;
     std::shared_ptr<SpeexDsp> m_speex;
@@ -55,6 +68,11 @@ private:
 
     std::vector<uint8_t> m_nearendBuffer;
     std::vector<uint8_t> m_farendBuffer;
+
+    EchoRecordPrivate *m_d = nullptr;
 };
 
+Dsp dspFromString(const std::string &dsp);
+std::string dspToString(Dsp dsp);
+
 #endif // __MAIN_H__

VocieProcess/CMakeLists.txt

@@ -19,12 +19,14 @@ add_library(VocieProcess
     api/audio/audio_processing.h api/audio/audio_processing.cc
     api/audio/channel_layout.h api/audio/channel_layout.cc
     api/audio/echo_canceller3_config.h api/audio/echo_canceller3_config.cc
+    api/audio/echo_canceller3_factory.h api/audio/echo_canceller3_factory.cc
 
     api/task_queue/task_queue_base.h api/task_queue/task_queue_base.cc
 
     api/units/time_delta.h api/units/time_delta.cc
     api/units/timestamp.h api/units/timestamp.cc
 
+    common_audio/audio_util.cc
     common_audio/channel_buffer.h common_audio/channel_buffer.cc
     common_audio/ring_buffer.h common_audio/ring_buffer.c
 
@@ -41,6 +43,7 @@ add_library(VocieProcess
     common_audio/signal_processing/randomization_functions.c
     common_audio/signal_processing/real_fft.c
     common_audio/signal_processing/spl_init.c
+    common_audio/signal_processing/splitting_filter.c
     common_audio/signal_processing/vector_scaling_operations.c
 
     common_audio/third_party/ooura/fft_size_128/ooura_fft.h common_audio/third_party/ooura/fft_size_128/ooura_fft.cc
@@ -136,13 +139,16 @@ add_library(VocieProcess
     modules/audio_processing/utility/cascaded_biquad_filter.h modules/audio_processing/utility/cascaded_biquad_filter.cc
     modules/audio_processing/utility/delay_estimator_wrapper.h  modules/audio_processing/utility/delay_estimator_wrapper.cc
     modules/audio_processing/utility/delay_estimator.h modules/audio_processing/utility/delay_estimator.cc
+
+    system_wrappers/source/field_trial.cc
+    system_wrappers/source/metrics.cc
 )
 
 target_compile_definitions(VocieProcess
     PRIVATE NOMINMAX # <windows.h>
     PRIVATE RTC_DISABLE_LOGGING
-    PRIVATE RTC_METRICS_ENABLED=0
+    PUBLIC RTC_DISABLE_METRICS
-    PRIVATE WEBRTC_APM_DEBUG_DUMP=0
+    PUBLIC WEBRTC_APM_DEBUG_DUMP=0
     $<$<PLATFORM_ID:Windows>:WEBRTC_WIN>
     $<$<PLATFORM_ID:Linux>:WEBRTC_POSIX WEBRTC_LINUX>
 )

VocieProcess/api/audio/echo_canceller3_factory.cc

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (c) 2018 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 "api/audio/echo_canceller3_factory.h"
+
+#include <memory>
+
+#include "absl/types/optional.h"
+#include "api/audio/echo_canceller3_config.h"
+#include "api/audio/echo_control.h"
+#include "modules/audio_processing/aec3/echo_canceller3.h"
+
+namespace webrtc {
+
+EchoCanceller3Factory::EchoCanceller3Factory() {}
+
+EchoCanceller3Factory::EchoCanceller3Factory(const EchoCanceller3Config& config)
+    : config_(config) {}
+
+std::unique_ptr<EchoControl> EchoCanceller3Factory::Create(
+    int sample_rate_hz,
+    int num_render_channels,
+    int num_capture_channels) {
+  return std::make_unique<EchoCanceller3>(
+      config_, /*multichannel_config=*/absl::nullopt, sample_rate_hz,
+      num_render_channels, num_capture_channels);
+}
+
+}  // namespace webrtc

VocieProcess/api/audio/echo_canceller3_factory.h

@@ -0,0 +1,41 @@
+/*
+ *  Copyright (c) 2018 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 API_AUDIO_ECHO_CANCELLER3_FACTORY_H_
+#define API_AUDIO_ECHO_CANCELLER3_FACTORY_H_
+
+#include <memory>
+
+#include "api/audio/echo_canceller3_config.h"
+#include "api/audio/echo_control.h"
+#include "rtc_base/system/rtc_export.h"
+
+namespace webrtc {
+
+class RTC_EXPORT EchoCanceller3Factory : public EchoControlFactory {
+ public:
+  // Factory producing EchoCanceller3 instances with the default configuration.
+  EchoCanceller3Factory();
+
+  // Factory producing EchoCanceller3 instances with the specified
+  // configuration.
+  explicit EchoCanceller3Factory(const EchoCanceller3Config& config);
+
+  // Creates an EchoCanceller3 with a specified channel count and sampling rate.
+  std::unique_ptr<EchoControl> Create(int sample_rate_hz,
+                                      int num_render_channels,
+                                      int num_capture_channels) override;
+
+ private:
+  const EchoCanceller3Config config_;
+};
+}  // namespace webrtc
+
+#endif  // API_AUDIO_ECHO_CANCELLER3_FACTORY_H_

VocieProcess/common_audio/audio_util.cc

@@ -0,0 +1,54 @@
+/*
+ *  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.
+ */
+
+#include "common_audio/include/audio_util.h"
+
+namespace webrtc {
+
+void FloatToS16(const float* src, size_t size, int16_t* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatToS16(src[i]);
+}
+
+void S16ToFloat(const int16_t* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = S16ToFloat(src[i]);
+}
+
+void S16ToFloatS16(const int16_t* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = src[i];
+}
+
+void FloatS16ToS16(const float* src, size_t size, int16_t* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatS16ToS16(src[i]);
+}
+
+void FloatToFloatS16(const float* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatToFloatS16(src[i]);
+}
+
+void FloatS16ToFloat(const float* src, size_t size, float* dest) {
+  for (size_t i = 0; i < size; ++i)
+    dest[i] = FloatS16ToFloat(src[i]);
+}
+
+template <>
+void DownmixInterleavedToMono<int16_t>(const int16_t* interleaved,
+                                       size_t num_frames,
+                                       int num_channels,
+                                       int16_t* deinterleaved) {
+  DownmixInterleavedToMonoImpl<int16_t, int32_t>(interleaved, num_frames,
+                                                 num_channels, deinterleaved);
+}
+
+}  // namespace webrtc

VocieProcess/common_audio/signal_processing/splitting_filter.c

@@ -0,0 +1,211 @@
+/*
+ *  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 splitting filter functions.
+ *
+ */
+
+#include "rtc_base/checks.h"
+#include "common_audio/signal_processing/include/signal_processing_library.h"
+
+// Maximum number of samples in a low/high-band frame.
+enum
+{
+    kMaxBandFrameLength = 320  // 10 ms at 64 kHz.
+};
+
+// QMF filter coefficients in Q16.
+static const uint16_t WebRtcSpl_kAllPassFilter1[3] = {6418, 36982, 57261};
+static const uint16_t WebRtcSpl_kAllPassFilter2[3] = {21333, 49062, 63010};
+
+///////////////////////////////////////////////////////////////////////////////////////////////
+// WebRtcSpl_AllPassQMF(...)
+//
+// Allpass filter used by the analysis and synthesis parts of the QMF filter.
+//
+// Input:
+//    - in_data             : Input data sequence (Q10)
+//    - data_length         : Length of data sequence (>2)
+//    - filter_coefficients : Filter coefficients (length 3, Q16)
+//
+// Input & Output:
+//    - filter_state        : Filter state (length 6, Q10).
+//
+// Output:
+//    - out_data            : Output data sequence (Q10), length equal to
+//                            `data_length`
+//
+
+static void WebRtcSpl_AllPassQMF(int32_t* in_data,
+                                 size_t data_length,
+                                 int32_t* out_data,
+                                 const uint16_t* filter_coefficients,
+                                 int32_t* filter_state)
+{
+    // The procedure is to filter the input with three first order all pass
+    // filters (cascade operations).
+    //
+    //         a_3 + q^-1    a_2 + q^-1    a_1 + q^-1
+    // y[n] =  -----------   -----------   -----------   x[n]
+    //         1 + a_3q^-1   1 + a_2q^-1   1 + a_1q^-1
+    //
+    // The input vector `filter_coefficients` includes these three filter
+    // coefficients. The filter state contains the in_data state, in_data[-1],
+    // followed by the out_data state, out_data[-1]. This is repeated for each
+    // cascade. The first cascade filter will filter the `in_data` and store
+    // the output in `out_data`. The second will the take the `out_data` as
+    // input and make an intermediate storage in `in_data`, to save memory. The
+    // third, and final, cascade filter operation takes the `in_data` (which is
+    // the output from the previous cascade filter) and store the output in
+    // `out_data`. Note that the input vector values are changed during the
+    // process.
+    size_t k;
+    int32_t diff;
+    // First all-pass cascade; filter from in_data to out_data.
+
+    // Let y_i[n] indicate the output of cascade filter i (with filter
+    // coefficient a_i) at vector position n. Then the final output will be
+    // y[n] = y_3[n]
+
+    // First loop, use the states stored in memory.
+    // "diff" should be safe from wrap around since max values are 2^25
+    // diff = (x[0] - y_1[-1])
+    diff = WebRtcSpl_SubSatW32(in_data[0], filter_state[1]);
+    // y_1[0] =  x[-1] + a_1 * (x[0] - y_1[-1])
+    out_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[0], diff, filter_state[0]);
+
+    // For the remaining loops, use previous values.
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (x[n] - y_1[n-1])
+        diff = WebRtcSpl_SubSatW32(in_data[k], out_data[k - 1]);
+        // y_1[n] =  x[n-1] + a_1 * (x[n] - y_1[n-1])
+        out_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[0], diff, in_data[k - 1]);
+    }
+
+    // Update states.
+    filter_state[0] = in_data[data_length - 1]; // x[N-1], becomes x[-1] next time
+    filter_state[1] = out_data[data_length - 1]; // y_1[N-1], becomes y_1[-1] next time
+
+    // Second all-pass cascade; filter from out_data to in_data.
+    // diff = (y_1[0] - y_2[-1])
+    diff = WebRtcSpl_SubSatW32(out_data[0], filter_state[3]);
+    // y_2[0] =  y_1[-1] + a_2 * (y_1[0] - y_2[-1])
+    in_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[1], diff, filter_state[2]);
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (y_1[n] - y_2[n-1])
+        diff = WebRtcSpl_SubSatW32(out_data[k], in_data[k - 1]);
+        // y_2[0] =  y_1[-1] + a_2 * (y_1[0] - y_2[-1])
+        in_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[1], diff, out_data[k-1]);
+    }
+
+    filter_state[2] = out_data[data_length - 1]; // y_1[N-1], becomes y_1[-1] next time
+    filter_state[3] = in_data[data_length - 1]; // y_2[N-1], becomes y_2[-1] next time
+
+    // Third all-pass cascade; filter from in_data to out_data.
+    // diff = (y_2[0] - y[-1])
+    diff = WebRtcSpl_SubSatW32(in_data[0], filter_state[5]);
+    // y[0] =  y_2[-1] + a_3 * (y_2[0] - y[-1])
+    out_data[0] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[2], diff, filter_state[4]);
+    for (k = 1; k < data_length; k++)
+    {
+        // diff = (y_2[n] - y[n-1])
+        diff = WebRtcSpl_SubSatW32(in_data[k], out_data[k - 1]);
+        // y[n] =  y_2[n-1] + a_3 * (y_2[n] - y[n-1])
+        out_data[k] = WEBRTC_SPL_SCALEDIFF32(filter_coefficients[2], diff, in_data[k-1]);
+    }
+    filter_state[4] = in_data[data_length - 1]; // y_2[N-1], becomes y_2[-1] next time
+    filter_state[5] = out_data[data_length - 1]; // y[N-1], becomes y[-1] next time
+}
+
+void WebRtcSpl_AnalysisQMF(const int16_t* in_data, size_t in_data_length,
+                           int16_t* low_band, int16_t* high_band,
+                           int32_t* filter_state1, int32_t* filter_state2)
+{
+    size_t i;
+    int16_t k;
+    int32_t tmp;
+    int32_t half_in1[kMaxBandFrameLength];
+    int32_t half_in2[kMaxBandFrameLength];
+    int32_t filter1[kMaxBandFrameLength];
+    int32_t filter2[kMaxBandFrameLength];
+    const size_t band_length = in_data_length / 2;
+    RTC_DCHECK_EQ(0, in_data_length % 2);
+    RTC_DCHECK_LE(band_length, kMaxBandFrameLength);
+
+    // Split even and odd samples. Also shift them to Q10.
+    for (i = 0, k = 0; i < band_length; i++, k += 2)
+    {
+        half_in2[i] = ((int32_t)in_data[k]) * (1 << 10);
+        half_in1[i] = ((int32_t)in_data[k + 1]) * (1 << 10);
+    }
+
+    // All pass filter even and odd samples, independently.
+    WebRtcSpl_AllPassQMF(half_in1, band_length, filter1,
+                         WebRtcSpl_kAllPassFilter1, filter_state1);
+    WebRtcSpl_AllPassQMF(half_in2, band_length, filter2,
+                         WebRtcSpl_kAllPassFilter2, filter_state2);
+
+    // Take the sum and difference of filtered version of odd and even
+    // branches to get upper & lower band.
+    for (i = 0; i < band_length; i++)
+    {
+        tmp = (filter1[i] + filter2[i] + 1024) >> 11;
+        low_band[i] = WebRtcSpl_SatW32ToW16(tmp);
+
+        tmp = (filter1[i] - filter2[i] + 1024) >> 11;
+        high_band[i] = WebRtcSpl_SatW32ToW16(tmp);
+    }
+}
+
+void WebRtcSpl_SynthesisQMF(const int16_t* low_band, const int16_t* high_band,
+                            size_t band_length, int16_t* out_data,
+                            int32_t* filter_state1, int32_t* filter_state2)
+{
+    int32_t tmp;
+    int32_t half_in1[kMaxBandFrameLength];
+    int32_t half_in2[kMaxBandFrameLength];
+    int32_t filter1[kMaxBandFrameLength];
+    int32_t filter2[kMaxBandFrameLength];
+    size_t i;
+    int16_t k;
+    RTC_DCHECK_LE(band_length, kMaxBandFrameLength);
+
+    // Obtain the sum and difference channels out of upper and lower-band channels.
+    // Also shift to Q10 domain.
+    for (i = 0; i < band_length; i++)
+    {
+        tmp = (int32_t)low_band[i] + (int32_t)high_band[i];
+        half_in1[i] = tmp * (1 << 10);
+        tmp = (int32_t)low_band[i] - (int32_t)high_band[i];
+        half_in2[i] = tmp * (1 << 10);
+    }
+
+    // all-pass filter the sum and difference channels
+    WebRtcSpl_AllPassQMF(half_in1, band_length, filter1,
+                         WebRtcSpl_kAllPassFilter2, filter_state1);
+    WebRtcSpl_AllPassQMF(half_in2, band_length, filter2,
+                         WebRtcSpl_kAllPassFilter1, filter_state2);
+
+    // The filtered signals are even and odd samples of the output. Combine
+    // them. The signals are Q10 should shift them back to Q0 and take care of
+    // saturation.
+    for (i = 0, k = 0; i < band_length; i++)
+    {
+        tmp = (filter2[i] + 512) >> 10;
+        out_data[k++] = WebRtcSpl_SatW32ToW16(tmp);
+
+        tmp = (filter1[i] + 512) >> 10;
+        out_data[k++] = WebRtcSpl_SatW32ToW16(tmp);
+    }
+
+}

VocieProcess/experiments/registered_field_trials.h

@@ -0,0 +1,289 @@
+// This file was automatically generated. Do not edit.
+
+#ifndef GEN_REGISTERED_FIELD_TRIALS_H_
+#define GEN_REGISTERED_FIELD_TRIALS_H_
+
+#include "absl/strings/string_view.h"
+
+namespace webrtc {
+
+inline constexpr absl::string_view kRegisteredFieldTrials[] = {
+    "WebRTC-AV1-OverridePriorityBitrate",
+    "WebRTC-AddNetworkCostToVpn",
+    "WebRTC-AddPacingToCongestionWindowPushback",
+    "WebRTC-AdjustOpusBandwidth",
+    "WebRTC-Aec3AecStateFullResetKillSwitch",
+    "WebRTC-Aec3AecStateSubtractorAnalyzerResetKillSwitch",
+    "WebRTC-Aec3AntiHowlingMinimizationKillSwitch",
+    "WebRTC-Aec3BufferingMaxAllowedExcessRenderBlocksOverride",
+    "WebRTC-Aec3ClampInstQualityToOneKillSwitch",
+    "WebRTC-Aec3ClampInstQualityToZeroKillSwitch",
+    "WebRTC-Aec3CoarseFilterResetHangoverKillSwitch",
+    "WebRTC-Aec3ConservativeTailFreqResponse",
+    "WebRTC-Aec3DeactivateInitialStateResetKillSwitch",
+    "WebRTC-Aec3DelayEstimateSmoothingDelayFoundOverride",
+    "WebRTC-Aec3DelayEstimateSmoothingOverride",
+    "WebRTC-Aec3EchoSaturationDetectionKillSwitch",
+    "WebRTC-Aec3EnforceCaptureDelayEstimationDownmixing",
+    "WebRTC-Aec3EnforceCaptureDelayEstimationLeftRightPrioritization",
+    "WebRTC-Aec3EnforceConservativeHfSuppression",
+    "WebRTC-Aec3EnforceLowActiveRenderLimit",
+    "WebRTC-Aec3EnforceMoreTransparentNearendSuppressorHfTuning",
+    "WebRTC-Aec3EnforceMoreTransparentNearendSuppressorTuning",
+    "WebRTC-Aec3EnforceMoreTransparentNormalSuppressorHfTuning",
+    "WebRTC-Aec3EnforceMoreTransparentNormalSuppressorTuning",
+    "WebRTC-Aec3EnforceRapidlyAdjustingNearendSuppressorTunings",
+    "WebRTC-Aec3EnforceRapidlyAdjustingNormalSuppressorTunings",
+    "WebRTC-Aec3EnforceRenderDelayEstimationDownmixing",
+    "WebRTC-Aec3EnforceSlowlyAdjustingNearendSuppressorTunings",
+    "WebRTC-Aec3EnforceSlowlyAdjustingNormalSuppressorTunings",
+    "WebRTC-Aec3EnforceStationarityProperties",
+    "WebRTC-Aec3EnforceStationarityPropertiesAtInit",
+    "WebRTC-Aec3EnforceVeryLowActiveRenderLimit",
+    "WebRTC-Aec3HighPassFilterEchoReference",
+    "WebRTC-Aec3MinErleDuringOnsetsKillSwitch",
+    "WebRTC-Aec3NonlinearModeReverbKillSwitch",
+    "WebRTC-Aec3OnsetDetectionKillSwitch",
+    "WebRTC-Aec3RenderDelayEstimationLeftRightPrioritizationKillSwitch",
+    "WebRTC-Aec3SensitiveDominantNearendActivation",
+    "WebRTC-Aec3SetupSpecificDefaultConfigDefaultsKillSwitch",
+    "WebRTC-Aec3ShortHeadroomKillSwitch",
+    "WebRTC-Aec3StereoContentDetectionKillSwitch",
+    "WebRTC-Aec3SuppressorAntiHowlingGainOverride",
+    "WebRTC-Aec3SuppressorDominantNearendEnrExitThresholdOverride",
+    "WebRTC-Aec3SuppressorDominantNearendEnrThresholdOverride",
+    "WebRTC-Aec3SuppressorDominantNearendHoldDurationOverride",
+    "WebRTC-Aec3SuppressorDominantNearendSnrThresholdOverride",
+    "WebRTC-Aec3SuppressorDominantNearendTriggerThresholdOverride",
+    "WebRTC-Aec3SuppressorNearendHfMaskSuppressOverride",
+    "WebRTC-Aec3SuppressorNearendHfMaskTransparentOverride",
+    "WebRTC-Aec3SuppressorNearendLfMaskSuppressOverride",
+    "WebRTC-Aec3SuppressorNearendLfMaskTransparentOverride",
+    "WebRTC-Aec3SuppressorNearendMaxDecFactorLfOverride",
+    "WebRTC-Aec3SuppressorNearendMaxIncFactorOverride",
+    "WebRTC-Aec3SuppressorNormalHfMaskSuppressOverride",
+    "WebRTC-Aec3SuppressorNormalHfMaskTransparentOverride",
+    "WebRTC-Aec3SuppressorNormalLfMaskSuppressOverride",
+    "WebRTC-Aec3SuppressorNormalLfMaskTransparentOverride",
+    "WebRTC-Aec3SuppressorNormalMaxDecFactorLfOverride",
+    "WebRTC-Aec3SuppressorNormalMaxIncFactorOverride",
+    "WebRTC-Aec3SuppressorTuningOverride",
+    "WebRTC-Aec3TransparentAntiHowlingGain",
+    "WebRTC-Aec3TransparentModeHmm",
+    "WebRTC-Aec3TransparentModeKillSwitch",
+    "WebRTC-Aec3Use1Dot2SecondsInitialStateDuration",
+    "WebRTC-Aec3Use1Dot6SecondsInitialStateDuration",
+    "WebRTC-Aec3Use2Dot0SecondsInitialStateDuration",
+    "WebRTC-Aec3UseDot1SecondsInitialStateDuration",
+    "WebRTC-Aec3UseDot2SecondsInitialStateDuration",
+    "WebRTC-Aec3UseDot3SecondsInitialStateDuration",
+    "WebRTC-Aec3UseDot6SecondsInitialStateDuration",
+    "WebRTC-Aec3UseDot9SecondsInitialStateDuration",
+    "WebRTC-Aec3UseErleOnsetCompensationInDominantNearend",
+    "WebRTC-Aec3UseLowEarlyReflectionsDefaultGain",
+    "WebRTC-Aec3UseLowLateReflectionsDefaultGain",
+    "WebRTC-Aec3UseNearendReverbLen",
+    "WebRTC-Aec3UseShortConfigChangeDuration",
+    "WebRTC-Aec3UseZeroInitialStateDuration",
+    "WebRTC-Aec3VerySensitiveDominantNearendActivation",
+    "WebRTC-Agc2SimdAvx2KillSwitch",
+    "WebRTC-Agc2SimdNeonKillSwitch",
+    "WebRTC-Agc2SimdSse2KillSwitch",
+    "WebRTC-AllowMACBasedIPv6",
+    "WebRTC-AlrDetectorParameters",
+    "WebRTC-AndroidNetworkMonitor-IsAdapterAvailable",
+    "WebRTC-ApmExperimentalMultiChannelCaptureKillSwitch",
+    "WebRTC-ApmExperimentalMultiChannelRenderKillSwitch",
+    "WebRTC-Audio-2ndAgcMinMicLevelExperiment",
+    "WebRTC-Audio-ABWENoTWCC",
+    "WebRTC-Audio-AdaptivePtime",
+    "WebRTC-Audio-Allocation",
+    "WebRTC-Audio-AlrProbing",
+    "WebRTC-Audio-FecAdaptation",
+    "WebRTC-Audio-GainController2",
+    "WebRTC-Audio-LegacyOverhead",
+    "WebRTC-Audio-MinimizeResamplingOnMobile",
+    "WebRTC-Audio-NetEqDecisionLogicConfig",
+    "WebRTC-Audio-NetEqDelayManagerConfig",
+    "WebRTC-Audio-NetEqNackTrackerConfig",
+    "WebRTC-Audio-NetEqSmartFlushing",
+    "WebRTC-Audio-OpusBitrateMultipliers",
+    "WebRTC-Audio-OpusGeneratePlc",
+    "WebRTC-Audio-PriorityBitrate",
+    "WebRTC-Audio-Red-For-Opus",
+    "WebRTC-Audio-StableTargetAdaptation",
+    "WebRTC-Audio-iOS-Holding",
+    "WebRTC-AudioDevicePlayoutBufferSizeFactor",
+    "WebRTC-Av1-GetEncoderInfoOverride",
+    "WebRTC-BindUsingInterfaceName",
+    "WebRTC-BitrateAdjusterUseNewfangledHeadroomAdjustment",
+    "WebRTC-Bwe-AllocationProbing",
+    "WebRTC-Bwe-AlrProbing",
+    "WebRTC-Bwe-EstimateBoundedIncrease",
+    "WebRTC-Bwe-ExponentialProbing",
+    "WebRTC-Bwe-IgnoreProbesLowerThanNetworkStateEstimate",
+    "WebRTC-Bwe-InitialProbing",
+    "WebRTC-Bwe-InjectedCongestionController",
+    "WebRTC-Bwe-LimitPacingFactorByUpperLinkCapacityEstimate",
+    "WebRTC-Bwe-LimitProbesLowerThanThroughputEstimate",
+    "WebRTC-Bwe-LossBasedBweV2",
+    "WebRTC-Bwe-LossBasedControl",
+    "WebRTC-Bwe-MaxRttLimit",
+    "WebRTC-Bwe-MinAllocAsLowerBound",
+    "WebRTC-Bwe-NetworkRouteConstraints",
+    "WebRTC-Bwe-NoFeedbackReset",
+    "WebRTC-Bwe-PaceAtMaxOfBweAndLowerLinkCapacity",
+    "WebRTC-Bwe-ProbingBehavior",
+    "WebRTC-Bwe-ProbingConfiguration",
+    "WebRTC-Bwe-ReceiveTimeFix",
+    "WebRTC-Bwe-ReceiverLimitCapsOnly",
+    "WebRTC-Bwe-ResetOnAdapterIdChange",
+    "WebRTC-Bwe-RobustThroughputEstimatorSettings",
+    "WebRTC-Bwe-SafeResetOnRouteChange",
+    "WebRTC-Bwe-SeparateAudioPackets",
+    "WebRTC-Bwe-TrendlineEstimatorSettings",
+    "WebRTC-BweBackOffFactor",
+    "WebRTC-BweLossExperiment",
+    "WebRTC-BweRapidRecoveryExperiment",
+    "WebRTC-BweThroughputWindowConfig",
+    "WebRTC-BweWindowSizeInPackets",
+    "WebRTC-CongestionWindow",
+    "WebRTC-CpuLoadEstimator",
+    "WebRTC-DataChannelMessageInterleaving",
+    "WebRTC-Debugging-RtpDump",
+    "WebRTC-DecoderDataDumpDirectory",
+    "WebRTC-DefaultBitrateLimitsKillSwitch",
+    "WebRTC-DependencyDescriptorAdvertised",
+    "WebRTC-DisableRtxRateLimiter",
+    "WebRTC-DisableUlpFecExperiment",
+    "WebRTC-DontIncreaseDelayBasedBweInAlr",
+    "WebRTC-DscpFieldTrial",
+    "WebRTC-ElasticBitrateAllocation",
+    "WebRTC-EncoderDataDumpDirectory",
+    "WebRTC-ExtraICEPing",
+    "WebRTC-FakeNetworkReceiveConfig",
+    "WebRTC-FakeNetworkSendConfig",
+    "WebRTC-FilterAbsSendTimeExtension",
+    "WebRTC-FindNetworkHandleWithoutIpv6TemporaryPart",
+    "WebRTC-FlexFEC-03",
+    "WebRTC-FlexFEC-03-Advertised",
+    "WebRTC-ForcePlayoutDelay",
+    "WebRTC-ForceSendPlayoutDelay",
+    "WebRTC-ForceSimulatedOveruseIntervalMs",
+    "WebRTC-FrameCadenceAdapter-UseVideoFrameTimestamp",
+    "WebRTC-FrameDropper",
+    "WebRTC-FullBandHpfKillSwitch",
+    "WebRTC-GenericCodecDependencyDescriptor",
+    "WebRTC-GenericDescriptorAdvertised",
+    "WebRTC-GenericDescriptorAuth",
+    "WebRTC-GenericPictureId",
+    "WebRTC-GetEncoderInfoOverride",
+    "WebRTC-H264HighProfile",
+    "WebRTC-IPv6Default",
+    "WebRTC-IPv6NetworkResolutionFixes",
+    "WebRTC-IceControllerFieldTrials",
+    "WebRTC-IceFieldTrials",
+    "WebRTC-IncomingTimestampOnMarkerBitOnly",
+    "WebRTC-IncreaseIceCandidatePriorityHostSrflx",
+    "WebRTC-JitterEstimatorConfig",
+    "WebRTC-KeyframeInterval",
+    "WebRTC-LegacyFrameIdJumpBehavior",
+    "WebRTC-LegacySimulcastLayerLimit",
+    "WebRTC-LegacyTlsProtocols",
+    "WebRTC-LibaomAv1Encoder-AdaptiveMaxConsecDrops",
+    "WebRTC-LibvpxVp8Encoder-AndroidSpecificThreadingSettings",
+    "WebRTC-LibvpxVp9Encoder-SvcFrameDropConfig",
+    "WebRTC-LowresSimulcastBitrateInterpolation",
+    "WebRTC-MutedStateKillSwitch",
+    "WebRTC-Network-UseNWPathMonitor",
+    "WebRTC-NetworkMonitorAutoDetect",
+    "WebRTC-NormalizeSimulcastResolution",
+    "WebRTC-Pacer-BlockAudio",
+    "WebRTC-Pacer-DrainQueue",
+    "WebRTC-Pacer-FastRetransmissions",
+    "WebRTC-Pacer-IgnoreTransportOverhead",
+    "WebRTC-Pacer-KeyframeFlushing",
+    "WebRTC-Pacer-PadInSilence",
+    "WebRTC-PacketBufferMaxSize",
+    "WebRTC-PcFactoryDefaultBitrates",
+    "WebRTC-PermuteTlsClientHello",
+    "WebRTC-PiggybackIceCheckAcknowledgement",
+    "WebRTC-PixelLimitResource",
+    "WebRTC-ProbingScreenshareBwe",
+    "WebRTC-ProtectionOverheadRateThreshold",
+    "WebRTC-QCM-Dynamic-AV1",
+    "WebRTC-QCM-Dynamic-VP8",
+    "WebRTC-QCM-Dynamic-VP9",
+    "WebRTC-QpParsingKillSwitch",
+    "WebRTC-RFC8888CongestionControlFeedback",
+    "WebRTC-ReceiveBufferSize",
+    "WebRTC-RtcEventLogEncodeDependencyDescriptor",
+    "WebRTC-RtcEventLogEncodeNetEqSetMinimumDelayKillSwitch",
+    "WebRTC-RtcEventLogKillSwitch",
+    "WebRTC-RtcEventLogNewFormat",
+    "WebRTC-RtcpLossNotification",
+    "WebRTC-SendBufferSizeBytes",
+    "WebRTC-SendNackDelayMs",
+    "WebRTC-SetCodecPreferences-ReceiveOnlyFilterInsteadOfThrow",
+    "WebRTC-SetReadyToSendFalseIfSendFail",
+    "WebRTC-SetSocketReceiveBuffer",
+    "WebRTC-SimulcastEncoderAdapter-GetEncoderInfoOverride",
+    "WebRTC-SimulcastLayerLimitRoundUp",
+    "WebRTC-SpsPpsIdrIsH264Keyframe",
+    "WebRTC-SrtpRemoveReceiveStream",
+    "WebRTC-StableTargetRate",
+    "WebRTC-StrictPacingAndProbing",
+    "WebRTC-StunInterPacketDelay",
+    "WebRTC-SurfaceCellularTypes",
+    "WebRTC-SwitchEncoderOnInitializationFailures",
+    "WebRTC-Target-Bitrate-Rtcp",
+    "WebRTC-TaskQueue-ReplaceLibeventWithStdlib",
+    "WebRTC-TransientSuppressorForcedOff",
+    "WebRTC-UseBaseHeavyVP8TL3RateAllocation",
+    "WebRTC-UseDifferentiatedCellularCosts",
+    "WebRTC-UseNtpTimeAbsoluteSendTime",
+    "WebRTC-UseStandardBytesStats",
+    "WebRTC-UseTurnServerAsStunServer",
+    "WebRTC-VP8-ForcePartitionResilience",
+    "WebRTC-VP8-Forced-Fallback-Encoder-v2",
+    "WebRTC-VP8-GetEncoderInfoOverride",
+    "WebRTC-VP8-MaxFrameInterval",
+    "WebRTC-VP8-Postproc-Config",
+    "WebRTC-VP8-Postproc-Config-Arm",
+    "WebRTC-VP8IosMaxNumberOfThread",
+    "WebRTC-VP9-GetEncoderInfoOverride",
+    "WebRTC-VP9-LowTierOptimizations",
+    "WebRTC-VP9-PerformanceFlags",
+    "WebRTC-VP9QualityScaler",
+    "WebRTC-Video-AV1EvenPayloadSizes",
+    "WebRTC-Video-BalancedDegradation",
+    "WebRTC-Video-BalancedDegradationSettings",
+    "WebRTC-Video-DisableAutomaticResize",
+    "WebRTC-Video-DiscardPacketsWithUnknownSsrc",
+    "WebRTC-Video-EnableRetransmitAllLayers",
+    "WebRTC-Video-EncoderFallbackSettings",
+    "WebRTC-Video-ForcedSwDecoderFallback",
+    "WebRTC-Video-H26xPacketBuffer",
+    "WebRTC-Video-InitialDecoderResolution",
+    "WebRTC-Video-MinVideoBitrate",
+    "WebRTC-Video-Pacing",
+    "WebRTC-Video-PreferTemporalSupportOnBaseLayer",
+    "WebRTC-Video-QualityScalerSettings",
+    "WebRTC-Video-QualityScaling",
+    "WebRTC-Video-SimulcastIndependentFrameIds",
+    "WebRTC-Video-UseFrameRateForOverhead",
+    "WebRTC-Video-Vp9FlexibleMode",
+    "WebRTC-VideoEncoderSettings",
+    "WebRTC-VideoFrameTrackingIdAdvertised",
+    "WebRTC-VideoLayersAllocationAdvertised",
+    "WebRTC-VideoRateControl",
+    "WebRTC-Vp9ExternalRefCtrl",
+    "WebRTC-Vp9InterLayerPred",
+    "WebRTC-Vp9IssueKeyFrameOnLayerDeactivation",
+    "WebRTC-ZeroHertzQueueOverload",
+    "WebRTC-ZeroPlayoutDelay",
+};
+
+}  // namespace webrtc
+
+#endif  // GEN_REGISTERED_FIELD_TRIALS_H_

VocieProcess/rtc_base/synchronization/mutex_pthread.h

@@ -0,0 +1,101 @@
+/*
+ *  Copyright 2020 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 RTC_BASE_SYNCHRONIZATION_MUTEX_PTHREAD_H_
+#define RTC_BASE_SYNCHRONIZATION_MUTEX_PTHREAD_H_
+
+#if defined(WEBRTC_POSIX)
+
+#include <pthread.h>
+#if defined(WEBRTC_MAC)
+#include <pthread_spis.h>
+#endif
+
+#include "absl/base/attributes.h"
+#include "rtc_base/system/no_unique_address.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+class RTC_LOCKABLE MutexImpl final {
+ public:
+  MutexImpl() {
+    pthread_mutexattr_t mutex_attribute;
+    pthread_mutexattr_init(&mutex_attribute);
+#if defined(WEBRTC_MAC)
+    pthread_mutexattr_setpolicy_np(&mutex_attribute,
+                                   _PTHREAD_MUTEX_POLICY_FIRSTFIT);
+#endif
+    pthread_mutex_init(&mutex_, &mutex_attribute);
+    pthread_mutexattr_destroy(&mutex_attribute);
+  }
+  MutexImpl(const MutexImpl&) = delete;
+  MutexImpl& operator=(const MutexImpl&) = delete;
+  ~MutexImpl() { pthread_mutex_destroy(&mutex_); }
+
+  void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION() {
+    pthread_mutex_lock(&mutex_);
+    owner_.SetOwner();
+  }
+  ABSL_MUST_USE_RESULT bool TryLock() RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true) {
+    if (pthread_mutex_trylock(&mutex_) != 0) {
+      return false;
+    }
+    owner_.SetOwner();
+    return true;
+  }
+  void AssertHeld() const RTC_ASSERT_EXCLUSIVE_LOCK() { owner_.AssertOwned(); }
+  void Unlock() RTC_UNLOCK_FUNCTION() {
+    owner_.ClearOwner();
+    pthread_mutex_unlock(&mutex_);
+  }
+
+ private:
+  class OwnerRecord {
+   public:
+#if !RTC_DCHECK_IS_ON
+    void SetOwner() {}
+    void ClearOwner() {}
+    void AssertOwned() const {}
+#else
+    void SetOwner() {
+      latest_owner_ = pthread_self();
+      is_owned_ = true;
+    }
+    void ClearOwner() { is_owned_ = false; }
+    void AssertOwned() const {
+      RTC_CHECK(is_owned_);
+      RTC_CHECK(pthread_equal(latest_owner_, pthread_self()));
+    }
+
+   private:
+    // Use two separate primitive types, rather than absl::optional, since the
+    // data race described below might invalidate absl::optional invariants.
+    bool is_owned_ = false;
+    pthread_t latest_owner_ = pthread_self();
+#endif
+  };
+
+  pthread_mutex_t mutex_;
+  // This record is modified only with the mutex held, and hence, calls to
+  // AssertHeld where mutex is held are race-free and will always succeed.
+  //
+  // The failure case is more subtle: If AssertHeld is called from some thread
+  // not holding the mutex, and RTC_DCHECK_IS_ON==1, we have a data race. It is
+  // highly likely that the calling thread will see `is_owned_` false or
+  // `latest_owner_` different from itself, and crash. But it may fail to crash,
+  // and invoke some other undefined behavior (still, this race can happen only
+  // when RTC_DCHECK_IS_ON==1).
+  RTC_NO_UNIQUE_ADDRESS OwnerRecord owner_;
+};
+
+}  // namespace webrtc
+#endif  // #if defined(WEBRTC_POSIX)
+#endif  // RTC_BASE_SYNCHRONIZATION_MUTEX_PTHREAD_H_

VocieProcess/system_wrappers/source/field_trial.cc

@@ -0,0 +1,186 @@
+// Copyright (c) 2014 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 "system_wrappers/include/field_trial.h"
+
+#include <stddef.h>
+
+#include <map>
+#include <string>
+#include <utility>
+
+#include "absl/algorithm/container.h"
+#include "absl/strings/string_view.h"
+#include "experiments/registered_field_trials.h"
+#include "rtc_base/checks.h"
+#include "rtc_base/containers/flat_set.h"
+#include "rtc_base/logging.h"
+#include "rtc_base/string_encode.h"
+
+// Simple field trial implementation, which allows client to
+// specify desired flags in InitFieldTrialsFromString.
+namespace webrtc {
+namespace field_trial {
+
+static const char* trials_init_string = NULL;
+
+namespace {
+
+constexpr char kPersistentStringSeparator = '/';
+
+flat_set<std::string>& TestKeys() {
+  static auto* test_keys = new flat_set<std::string>();
+  return *test_keys;
+}
+
+// Validates the given field trial string.
+//  E.g.:
+//    "WebRTC-experimentFoo/Enabled/WebRTC-experimentBar/Enabled100kbps/"
+//    Assigns the process to group "Enabled" on WebRTCExperimentFoo trial
+//    and to group "Enabled100kbps" on WebRTCExperimentBar.
+//
+//  E.g. invalid config:
+//    "WebRTC-experiment1/Enabled"  (note missing / separator at the end).
+bool FieldTrialsStringIsValidInternal(const absl::string_view trials) {
+  if (trials.empty())
+    return true;
+
+  size_t next_item = 0;
+  std::map<absl::string_view, absl::string_view> field_trials;
+  while (next_item < trials.length()) {
+    size_t name_end = trials.find(kPersistentStringSeparator, next_item);
+    if (name_end == trials.npos || next_item == name_end)
+      return false;
+    size_t group_name_end =
+        trials.find(kPersistentStringSeparator, name_end + 1);
+    if (group_name_end == trials.npos || name_end + 1 == group_name_end)
+      return false;
+    absl::string_view name = trials.substr(next_item, name_end - next_item);
+    absl::string_view group_name =
+        trials.substr(name_end + 1, group_name_end - name_end - 1);
+
+    next_item = group_name_end + 1;
+
+    // Fail if duplicate with different group name.
+    if (field_trials.find(name) != field_trials.end() &&
+        field_trials.find(name)->second != group_name) {
+      return false;
+    }
+
+    field_trials[name] = group_name;
+  }
+
+  return true;
+}
+
+}  // namespace
+
+bool FieldTrialsStringIsValid(absl::string_view trials_string) {
+  return FieldTrialsStringIsValidInternal(trials_string);
+}
+
+void InsertOrReplaceFieldTrialStringsInMap(
+    std::map<std::string, std::string>* fieldtrial_map,
+    const absl::string_view trials_string) {
+  if (FieldTrialsStringIsValidInternal(trials_string)) {
+    std::vector<absl::string_view> tokens = rtc::split(trials_string, '/');
+    // Skip last token which is empty due to trailing '/'.
+    for (size_t idx = 0; idx < tokens.size() - 1; idx += 2) {
+      (*fieldtrial_map)[std::string(tokens[idx])] =
+          std::string(tokens[idx + 1]);
+    }
+  } else {
+    RTC_DCHECK_NOTREACHED() << "Invalid field trials string:" << trials_string;
+  }
+}
+
+std::string MergeFieldTrialsStrings(absl::string_view first,
+                                    absl::string_view second) {
+  std::map<std::string, std::string> fieldtrial_map;
+  InsertOrReplaceFieldTrialStringsInMap(&fieldtrial_map, first);
+  InsertOrReplaceFieldTrialStringsInMap(&fieldtrial_map, second);
+
+  // Merge into fieldtrial string.
+  std::string merged = "";
+  for (auto const& fieldtrial : fieldtrial_map) {
+    merged += fieldtrial.first + '/' + fieldtrial.second + '/';
+  }
+  return merged;
+}
+
+#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
+std::string FindFullName(absl::string_view name) {
+#if WEBRTC_STRICT_FIELD_TRIALS == 1
+  RTC_DCHECK(absl::c_linear_search(kRegisteredFieldTrials, name) ||
+             TestKeys().contains(name))
+      << name << " is not registered, see g3doc/field-trials.md.";
+#elif WEBRTC_STRICT_FIELD_TRIALS == 2
+  RTC_LOG_IF(LS_WARNING,
+             !(absl::c_linear_search(kRegisteredFieldTrials, name) ||
+               TestKeys().contains(name)))
+      << name << " is not registered, see g3doc/field-trials.md.";
+#endif
+
+  if (trials_init_string == NULL)
+    return std::string();
+
+  absl::string_view trials_string(trials_init_string);
+  if (trials_string.empty())
+    return std::string();
+
+  size_t next_item = 0;
+  while (next_item < trials_string.length()) {
+    // Find next name/value pair in field trial configuration string.
+    size_t field_name_end =
+        trials_string.find(kPersistentStringSeparator, next_item);
+    if (field_name_end == trials_string.npos || field_name_end == next_item)
+      break;
+    size_t field_value_end =
+        trials_string.find(kPersistentStringSeparator, field_name_end + 1);
+    if (field_value_end == trials_string.npos ||
+        field_value_end == field_name_end + 1)
+      break;
+    absl::string_view field_name =
+        trials_string.substr(next_item, field_name_end - next_item);
+    absl::string_view field_value = trials_string.substr(
+        field_name_end + 1, field_value_end - field_name_end - 1);
+    next_item = field_value_end + 1;
+
+    if (name == field_name)
+      return std::string(field_value);
+  }
+  return std::string();
+}
+#endif  // WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
+
+// Optionally initialize field trial from a string.
+void InitFieldTrialsFromString(const char* trials_string) {
+  RTC_LOG(LS_INFO) << "Setting field trial string:" << trials_string;
+  if (trials_string) {
+    RTC_DCHECK(FieldTrialsStringIsValidInternal(trials_string))
+        << "Invalid field trials string:" << trials_string;
+  };
+  trials_init_string = trials_string;
+}
+
+const char* GetFieldTrialString() {
+  return trials_init_string;
+}
+
+FieldTrialsAllowedInScopeForTesting::FieldTrialsAllowedInScopeForTesting(
+    flat_set<std::string> keys) {
+  TestKeys() = std::move(keys);
+}
+
+FieldTrialsAllowedInScopeForTesting::~FieldTrialsAllowedInScopeForTesting() {
+  TestKeys().clear();
+}
+
+}  // namespace field_trial
+}  // namespace webrtc

VocieProcess/system_wrappers/source/metrics.cc

@@ -0,0 +1,331 @@
+// Copyright (c) 2014 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 "system_wrappers/include/metrics.h"
+
+#include <algorithm>
+
+#include "absl/strings/string_view.h"
+#include "rtc_base/string_utils.h"
+#include "rtc_base/synchronization/mutex.h"
+#include "rtc_base/thread_annotations.h"
+
+// Default implementation of histogram methods for WebRTC clients that do not
+// want to provide their own implementation.
+
+namespace webrtc {
+namespace metrics {
+class Histogram;
+
+namespace {
+// Limit for the maximum number of sample values that can be stored.
+// TODO(asapersson): Consider using bucket count (and set up
+// linearly/exponentially spaced buckets) if samples are logged more frequently.
+const int kMaxSampleMapSize = 300;
+
+class RtcHistogram {
+ public:
+  RtcHistogram(absl::string_view name, int min, int max, int bucket_count)
+      : min_(min), max_(max), info_(name, min, max, bucket_count) {
+    RTC_DCHECK_GT(bucket_count, 0);
+  }
+
+  RtcHistogram(const RtcHistogram&) = delete;
+  RtcHistogram& operator=(const RtcHistogram&) = delete;
+
+  void Add(int sample) {
+    sample = std::min(sample, max_);
+    sample = std::max(sample, min_ - 1);  // Underflow bucket.
+
+    MutexLock lock(&mutex_);
+    if (info_.samples.size() == kMaxSampleMapSize &&
+        info_.samples.find(sample) == info_.samples.end()) {
+      return;
+    }
+    ++info_.samples[sample];
+  }
+
+  // Returns a copy (or nullptr if there are no samples) and clears samples.
+  std::unique_ptr<SampleInfo> GetAndReset() {
+    MutexLock lock(&mutex_);
+    if (info_.samples.empty())
+      return nullptr;
+
+    SampleInfo* copy =
+        new SampleInfo(info_.name, info_.min, info_.max, info_.bucket_count);
+
+    std::swap(info_.samples, copy->samples);
+
+    return std::unique_ptr<SampleInfo>(copy);
+  }
+
+  const std::string& name() const { return info_.name; }
+
+  // Functions only for testing.
+  void Reset() {
+    MutexLock lock(&mutex_);
+    info_.samples.clear();
+  }
+
+  int NumEvents(int sample) const {
+    MutexLock lock(&mutex_);
+    const auto it = info_.samples.find(sample);
+    return (it == info_.samples.end()) ? 0 : it->second;
+  }
+
+  int NumSamples() const {
+    int num_samples = 0;
+    MutexLock lock(&mutex_);
+    for (const auto& sample : info_.samples) {
+      num_samples += sample.second;
+    }
+    return num_samples;
+  }
+
+  int MinSample() const {
+    MutexLock lock(&mutex_);
+    return (info_.samples.empty()) ? -1 : info_.samples.begin()->first;
+  }
+
+  std::map<int, int> Samples() const {
+    MutexLock lock(&mutex_);
+    return info_.samples;
+  }
+
+ private:
+  mutable Mutex mutex_;
+  const int min_;
+  const int max_;
+  SampleInfo info_ RTC_GUARDED_BY(mutex_);
+};
+
+class RtcHistogramMap {
+ public:
+  RtcHistogramMap() {}
+  ~RtcHistogramMap() {}
+
+  RtcHistogramMap(const RtcHistogramMap&) = delete;
+  RtcHistogramMap& operator=(const RtcHistogramMap&) = delete;
+
+  Histogram* GetCountsHistogram(absl::string_view name,
+                                int min,
+                                int max,
+                                int bucket_count) {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    if (it != map_.end())
+      return reinterpret_cast<Histogram*>(it->second.get());
+
+    RtcHistogram* hist = new RtcHistogram(name, min, max, bucket_count);
+    map_.emplace(name, hist);
+    return reinterpret_cast<Histogram*>(hist);
+  }
+
+  Histogram* GetEnumerationHistogram(absl::string_view name, int boundary) {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    if (it != map_.end())
+      return reinterpret_cast<Histogram*>(it->second.get());
+
+    RtcHistogram* hist = new RtcHistogram(name, 1, boundary, boundary + 1);
+    map_.emplace(name, hist);
+    return reinterpret_cast<Histogram*>(hist);
+  }
+
+  void GetAndReset(std::map<std::string,
+                            std::unique_ptr<SampleInfo>,
+                            rtc::AbslStringViewCmp>* histograms) {
+    MutexLock lock(&mutex_);
+    for (const auto& kv : map_) {
+      std::unique_ptr<SampleInfo> info = kv.second->GetAndReset();
+      if (info)
+        histograms->insert(std::make_pair(kv.first, std::move(info)));
+    }
+  }
+
+  // Functions only for testing.
+  void Reset() {
+    MutexLock lock(&mutex_);
+    for (const auto& kv : map_)
+      kv.second->Reset();
+  }
+
+  int NumEvents(absl::string_view name, int sample) const {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    return (it == map_.end()) ? 0 : it->second->NumEvents(sample);
+  }
+
+  int NumSamples(absl::string_view name) const {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    return (it == map_.end()) ? 0 : it->second->NumSamples();
+  }
+
+  int MinSample(absl::string_view name) const {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    return (it == map_.end()) ? -1 : it->second->MinSample();
+  }
+
+  std::map<int, int> Samples(absl::string_view name) const {
+    MutexLock lock(&mutex_);
+    const auto& it = map_.find(name);
+    return (it == map_.end()) ? std::map<int, int>() : it->second->Samples();
+  }
+
+ private:
+  mutable Mutex mutex_;
+  std::map<std::string, std::unique_ptr<RtcHistogram>, rtc::AbslStringViewCmp>
+      map_ RTC_GUARDED_BY(mutex_);
+};
+
+// RtcHistogramMap is allocated upon call to Enable().
+// The histogram getter functions, which return pointer values to the histograms
+// in the map, are cached in WebRTC. Therefore, this memory is not freed by the
+// application (the memory will be reclaimed by the OS).
+static std::atomic<RtcHistogramMap*> g_rtc_histogram_map(nullptr);
+
+void CreateMap() {
+  RtcHistogramMap* map = g_rtc_histogram_map.load(std::memory_order_acquire);
+  if (map == nullptr) {
+    RtcHistogramMap* new_map = new RtcHistogramMap();
+    if (!g_rtc_histogram_map.compare_exchange_strong(map, new_map))
+      delete new_map;
+  }
+}
+
+// Set the first time we start using histograms. Used to make sure Enable() is
+// not called thereafter.
+#if RTC_DCHECK_IS_ON
+static std::atomic<int> g_rtc_histogram_called(0);
+#endif
+
+// Gets the map (or nullptr).
+RtcHistogramMap* GetMap() {
+#if RTC_DCHECK_IS_ON
+  g_rtc_histogram_called.store(1, std::memory_order_release);
+#endif
+  return g_rtc_histogram_map.load();
+}
+}  // namespace
+
+#ifndef WEBRTC_EXCLUDE_METRICS_DEFAULT
+// Implementation of histogram methods in
+// webrtc/system_wrappers/interface/metrics.h.
+
+// Histogram with exponentially spaced buckets.
+// Creates (or finds) histogram.
+// The returned histogram pointer is cached (and used for adding samples in
+// subsequent calls).
+Histogram* HistogramFactoryGetCounts(absl::string_view name,
+                                     int min,
+                                     int max,
+                                     int bucket_count) {
+  // TODO(asapersson): Alternative implementation will be needed if this
+  // histogram type should be truly exponential.
+  return HistogramFactoryGetCountsLinear(name, min, max, bucket_count);
+}
+
+// Histogram with linearly spaced buckets.
+// Creates (or finds) histogram.
+// The returned histogram pointer is cached (and used for adding samples in
+// subsequent calls).
+Histogram* HistogramFactoryGetCountsLinear(absl::string_view name,
+                                           int min,
+                                           int max,
+                                           int bucket_count) {
+  RtcHistogramMap* map = GetMap();
+  if (!map)
+    return nullptr;
+
+  return map->GetCountsHistogram(name, min, max, bucket_count);
+}
+
+// Histogram with linearly spaced buckets.
+// Creates (or finds) histogram.
+// The returned histogram pointer is cached (and used for adding samples in
+// subsequent calls).
+Histogram* HistogramFactoryGetEnumeration(absl::string_view name,
+                                          int boundary) {
+  RtcHistogramMap* map = GetMap();
+  if (!map)
+    return nullptr;
+
+  return map->GetEnumerationHistogram(name, boundary);
+}
+
+// Our default implementation reuses the non-sparse histogram.
+Histogram* SparseHistogramFactoryGetEnumeration(absl::string_view name,
+                                                int boundary) {
+  return HistogramFactoryGetEnumeration(name, boundary);
+}
+
+// Fast path. Adds `sample` to cached `histogram_pointer`.
+void HistogramAdd(Histogram* histogram_pointer, int sample) {
+  RtcHistogram* ptr = reinterpret_cast<RtcHistogram*>(histogram_pointer);
+  ptr->Add(sample);
+}
+
+#endif  // WEBRTC_EXCLUDE_METRICS_DEFAULT
+
+SampleInfo::SampleInfo(absl::string_view name,
+                       int min,
+                       int max,
+                       size_t bucket_count)
+    : name(name), min(min), max(max), bucket_count(bucket_count) {}
+
+SampleInfo::~SampleInfo() {}
+
+// Implementation of global functions in metrics.h.
+void Enable() {
+  RTC_DCHECK(g_rtc_histogram_map.load() == nullptr);
+#if RTC_DCHECK_IS_ON
+  RTC_DCHECK_EQ(0, g_rtc_histogram_called.load(std::memory_order_acquire));
+#endif
+  CreateMap();
+}
+
+void GetAndReset(
+    std::map<std::string, std::unique_ptr<SampleInfo>, rtc::AbslStringViewCmp>*
+        histograms) {
+  histograms->clear();
+  RtcHistogramMap* map = GetMap();
+  if (map)
+    map->GetAndReset(histograms);
+}
+
+void Reset() {
+  RtcHistogramMap* map = GetMap();
+  if (map)
+    map->Reset();
+}
+
+int NumEvents(absl::string_view name, int sample) {
+  RtcHistogramMap* map = GetMap();
+  return map ? map->NumEvents(name, sample) : 0;
+}
+
+int NumSamples(absl::string_view name) {
+  RtcHistogramMap* map = GetMap();
+  return map ? map->NumSamples(name) : 0;
+}
+
+int MinSample(absl::string_view name) {
+  RtcHistogramMap* map = GetMap();
+  return map ? map->MinSample(name) : -1;
+}
+
+std::map<int, int> Samples(absl::string_view name) {
+  RtcHistogramMap* map = GetMap();
+  return map ? map->Samples(name) : std::map<int, int>();
+}
+
+}  // namespace metrics
+}  // namespace webrtc