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-rw-r--r--dom/media/CubebUtils.cpp851
1 files changed, 851 insertions, 0 deletions
diff --git a/dom/media/CubebUtils.cpp b/dom/media/CubebUtils.cpp
new file mode 100644
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+++ b/dom/media/CubebUtils.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "CubebUtils.h"
+
+#include "audio_thread_priority.h"
+#include "mozilla/AbstractThread.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/ipc/FileDescriptor.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/Components.h"
+#include "mozilla/Sprintf.h"
+#include "mozilla/StaticMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/UnderrunHandler.h"
+#include "nsContentUtils.h"
+#include "nsDebug.h"
+#include "nsIStringBundle.h"
+#include "nsString.h"
+#include "nsThreadUtils.h"
+#include "prdtoa.h"
+#include <algorithm>
+#include <stdint.h>
+#ifdef MOZ_WIDGET_ANDROID
+# include "mozilla/java/GeckoAppShellWrappers.h"
+#endif
+#ifdef XP_WIN
+# include "mozilla/mscom/EnsureMTA.h"
+#endif
+#include "audioipc2_server_ffi_generated.h"
+#include "audioipc2_client_ffi_generated.h"
+#include <cmath>
+#include <thread>
+#include "CallbackThreadRegistry.h"
+#include "mozilla/StaticPrefs_media.h"
+
+#define AUDIOIPC_STACK_SIZE_DEFAULT (64 * 4096)
+
+#define PREF_VOLUME_SCALE "media.volume_scale"
+#define PREF_CUBEB_BACKEND "media.cubeb.backend"
+#define PREF_CUBEB_OUTPUT_DEVICE "media.cubeb.output_device"
+#define PREF_CUBEB_LATENCY_PLAYBACK "media.cubeb_latency_playback_ms"
+#define PREF_CUBEB_LATENCY_MTG "media.cubeb_latency_mtg_frames"
+// Allows to get something non-default for the preferred sample-rate, to allow
+// troubleshooting in the field and testing.
+#define PREF_CUBEB_FORCE_SAMPLE_RATE "media.cubeb.force_sample_rate"
+#define PREF_CUBEB_LOGGING_LEVEL "logging.cubeb"
+// Hidden pref used by tests to force failure to obtain cubeb context
+#define PREF_CUBEB_FORCE_NULL_CONTEXT "media.cubeb.force_null_context"
+#define PREF_CUBEB_OUTPUT_VOICE_ROUTING "media.cubeb.output_voice_routing"
+#define PREF_CUBEB_SANDBOX "media.cubeb.sandbox"
+#define PREF_AUDIOIPC_STACK_SIZE "media.audioipc.stack_size"
+#define PREF_AUDIOIPC_SHM_AREA_SIZE "media.audioipc.shm_area_size"
+
+#if (defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID)) || \
+ defined(XP_MACOSX) || defined(XP_WIN)
+# define MOZ_CUBEB_REMOTING
+#endif
+
+namespace mozilla {
+
+namespace {
+
+using Telemetry::LABELS_MEDIA_AUDIO_BACKEND;
+using Telemetry::LABELS_MEDIA_AUDIO_INIT_FAILURE;
+
+LazyLogModule gCubebLog("cubeb");
+
+void CubebLogCallback(const char* aFmt, ...) {
+ char buffer[1024];
+
+ va_list arglist;
+ va_start(arglist, aFmt);
+ VsprintfLiteral(buffer, aFmt, arglist);
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("%s", buffer));
+ va_end(arglist);
+}
+
+// This mutex protects the variables below.
+StaticMutex sMutex;
+enum class CubebState {
+ Uninitialized = 0,
+ Initialized,
+ Shutdown
+} sCubebState = CubebState::Uninitialized;
+cubeb* sCubebContext;
+double sVolumeScale = 1.0;
+uint32_t sCubebPlaybackLatencyInMilliseconds = 100;
+uint32_t sCubebMTGLatencyInFrames = 512;
+// If sCubebForcedSampleRate is zero, PreferredSampleRate will return the
+// preferred sample-rate for the audio backend in use. Otherwise, it will be
+// used as the preferred sample-rate.
+Atomic<uint32_t> sCubebForcedSampleRate{0};
+bool sCubebPlaybackLatencyPrefSet = false;
+bool sCubebMTGLatencyPrefSet = false;
+bool sAudioStreamInitEverSucceeded = false;
+bool sCubebForceNullContext = false;
+bool sRouteOutputAsVoice = false;
+#ifdef MOZ_CUBEB_REMOTING
+bool sCubebSandbox = false;
+size_t sAudioIPCStackSize;
+size_t sAudioIPCShmAreaSize;
+#endif
+StaticAutoPtr<char> sBrandName;
+StaticAutoPtr<char> sCubebBackendName;
+StaticAutoPtr<char> sCubebOutputDeviceName;
+#ifdef MOZ_WIDGET_ANDROID
+// Counts the number of time a request for switching to global "communication
+// mode" has been received. If this is > 0, global communication mode is to be
+// enabled. If it is 0, the global communication mode is to be disabled.
+// This allows to correctly track the global behaviour to adopt accross
+// asynchronous GraphDriver changes, on Android.
+int sInCommunicationCount = 0;
+#endif
+
+const char kBrandBundleURL[] = "chrome://branding/locale/brand.properties";
+
+std::unordered_map<std::string, LABELS_MEDIA_AUDIO_BACKEND>
+ kTelemetryBackendLabel = {
+ {"audiounit", LABELS_MEDIA_AUDIO_BACKEND::audiounit},
+ {"audiounit-rust", LABELS_MEDIA_AUDIO_BACKEND::audiounit_rust},
+ {"aaudio", LABELS_MEDIA_AUDIO_BACKEND::aaudio},
+ {"opensl", LABELS_MEDIA_AUDIO_BACKEND::opensl},
+ {"wasapi", LABELS_MEDIA_AUDIO_BACKEND::wasapi},
+ {"winmm", LABELS_MEDIA_AUDIO_BACKEND::winmm},
+ {"alsa", LABELS_MEDIA_AUDIO_BACKEND::alsa},
+ {"jack", LABELS_MEDIA_AUDIO_BACKEND::jack},
+ {"oss", LABELS_MEDIA_AUDIO_BACKEND::oss},
+ {"pulse", LABELS_MEDIA_AUDIO_BACKEND::pulse},
+ {"pulse-rust", LABELS_MEDIA_AUDIO_BACKEND::pulse_rust},
+ {"sndio", LABELS_MEDIA_AUDIO_BACKEND::sndio},
+ {"sun", LABELS_MEDIA_AUDIO_BACKEND::sunaudio},
+};
+
+// Prefered samplerate, in Hz (characteristic of the hardware, mixer, platform,
+// and API used).
+//
+// sMutex protects *initialization* of this, which must be performed from each
+// thread before fetching, after which it is safe to fetch without holding the
+// mutex because it is only written once per process execution (by the first
+// initialization to complete). Since the init must have been called on a
+// given thread before fetching the value, it's guaranteed (via the mutex) that
+// sufficient memory barriers have occurred to ensure the correct value is
+// visible on the querying thread/CPU.
+static Atomic<uint32_t> sPreferredSampleRate{0};
+
+#ifdef MOZ_CUBEB_REMOTING
+// AudioIPC server handle
+void* sServerHandle = nullptr;
+
+// Initialized during early startup, protected by sMutex.
+StaticAutoPtr<ipc::FileDescriptor> sIPCConnection;
+
+static bool StartAudioIPCServer() {
+ if (sCubebSandbox) {
+ audioipc2::AudioIpcServerInitParams initParams{};
+ initParams.mThreadCreateCallback = [](const char* aName) {
+ PROFILER_REGISTER_THREAD(aName);
+ };
+ initParams.mThreadDestroyCallback = []() { PROFILER_UNREGISTER_THREAD(); };
+
+ sServerHandle = audioipc2::audioipc2_server_start(
+ sBrandName, sCubebBackendName, &initParams);
+ }
+ return sServerHandle != nullptr;
+}
+
+static void ShutdownAudioIPCServer() {
+ if (!sServerHandle) {
+ return;
+ }
+
+ audioipc2::audioipc2_server_stop(sServerHandle);
+ sServerHandle = nullptr;
+}
+#endif // MOZ_CUBEB_REMOTING
+} // namespace
+
+static const uint32_t CUBEB_NORMAL_LATENCY_MS = 100;
+// Consevative default that can work on all platforms.
+static const uint32_t CUBEB_NORMAL_LATENCY_FRAMES = 1024;
+
+namespace CubebUtils {
+cubeb* GetCubebContextUnlocked();
+
+void GetPrefAndSetString(const char* aPref, StaticAutoPtr<char>& aStorage) {
+ nsAutoCString value;
+ Preferences::GetCString(aPref, value);
+ if (value.IsEmpty()) {
+ aStorage = nullptr;
+ } else {
+ aStorage = new char[value.Length() + 1];
+ PodCopy(aStorage.get(), value.get(), value.Length());
+ aStorage[value.Length()] = 0;
+ }
+}
+
+void PrefChanged(const char* aPref, void* aClosure) {
+ if (strcmp(aPref, PREF_VOLUME_SCALE) == 0) {
+ nsAutoCString value;
+ Preferences::GetCString(aPref, value);
+ StaticMutexAutoLock lock(sMutex);
+ if (value.IsEmpty()) {
+ sVolumeScale = 1.0;
+ } else {
+ sVolumeScale = std::max<double>(0, PR_strtod(value.get(), nullptr));
+ }
+ } else if (strcmp(aPref, PREF_CUBEB_LATENCY_PLAYBACK) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ // Arbitrary default stream latency of 100ms. The higher this
+ // value, the longer stream volume changes will take to become
+ // audible.
+ sCubebPlaybackLatencyPrefSet = Preferences::HasUserValue(aPref);
+ uint32_t value = Preferences::GetUint(aPref, CUBEB_NORMAL_LATENCY_MS);
+ sCubebPlaybackLatencyInMilliseconds =
+ std::min<uint32_t>(std::max<uint32_t>(value, 1), 1000);
+ } else if (strcmp(aPref, PREF_CUBEB_LATENCY_MTG) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sCubebMTGLatencyPrefSet = Preferences::HasUserValue(aPref);
+ uint32_t value = Preferences::GetUint(aPref, CUBEB_NORMAL_LATENCY_FRAMES);
+ // 128 is the block size for the Web Audio API, which limits how low the
+ // latency can be here.
+ // We don't want to limit the upper limit too much, so that people can
+ // experiment.
+ sCubebMTGLatencyInFrames =
+ std::min<uint32_t>(std::max<uint32_t>(value, 128), 1e6);
+ } else if (strcmp(aPref, PREF_CUBEB_FORCE_SAMPLE_RATE) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sCubebForcedSampleRate = Preferences::GetUint(aPref);
+ } else if (strcmp(aPref, PREF_CUBEB_LOGGING_LEVEL) == 0) {
+ LogLevel value =
+ ToLogLevel(Preferences::GetInt(aPref, 0 /* LogLevel::Disabled */));
+ if (value == LogLevel::Verbose) {
+ cubeb_set_log_callback(CUBEB_LOG_VERBOSE, CubebLogCallback);
+ } else if (value == LogLevel::Debug) {
+ cubeb_set_log_callback(CUBEB_LOG_NORMAL, CubebLogCallback);
+ } else if (value == LogLevel::Disabled) {
+ cubeb_set_log_callback(CUBEB_LOG_DISABLED, nullptr);
+ }
+ } else if (strcmp(aPref, PREF_CUBEB_BACKEND) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ GetPrefAndSetString(aPref, sCubebBackendName);
+ } else if (strcmp(aPref, PREF_CUBEB_OUTPUT_DEVICE) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ GetPrefAndSetString(aPref, sCubebOutputDeviceName);
+ } else if (strcmp(aPref, PREF_CUBEB_FORCE_NULL_CONTEXT) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sCubebForceNullContext = Preferences::GetBool(aPref, false);
+ MOZ_LOG(gCubebLog, LogLevel::Verbose,
+ ("%s: %s", PREF_CUBEB_FORCE_NULL_CONTEXT,
+ sCubebForceNullContext ? "true" : "false"));
+ }
+#ifdef MOZ_CUBEB_REMOTING
+ else if (strcmp(aPref, PREF_CUBEB_SANDBOX) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sCubebSandbox = Preferences::GetBool(aPref);
+ MOZ_LOG(gCubebLog, LogLevel::Verbose,
+ ("%s: %s", PREF_CUBEB_SANDBOX, sCubebSandbox ? "true" : "false"));
+ } else if (strcmp(aPref, PREF_AUDIOIPC_STACK_SIZE) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sAudioIPCStackSize = Preferences::GetUint(PREF_AUDIOIPC_STACK_SIZE,
+ AUDIOIPC_STACK_SIZE_DEFAULT);
+ } else if (strcmp(aPref, PREF_AUDIOIPC_SHM_AREA_SIZE) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sAudioIPCShmAreaSize = Preferences::GetUint(PREF_AUDIOIPC_SHM_AREA_SIZE);
+ }
+#endif
+ else if (strcmp(aPref, PREF_CUBEB_OUTPUT_VOICE_ROUTING) == 0) {
+ StaticMutexAutoLock lock(sMutex);
+ sRouteOutputAsVoice = Preferences::GetBool(aPref);
+ MOZ_LOG(gCubebLog, LogLevel::Verbose,
+ ("%s: %s", PREF_CUBEB_OUTPUT_VOICE_ROUTING,
+ sRouteOutputAsVoice ? "true" : "false"));
+ }
+}
+
+bool GetFirstStream() {
+ static bool sFirstStream = true;
+
+ StaticMutexAutoLock lock(sMutex);
+ bool result = sFirstStream;
+ sFirstStream = false;
+ return result;
+}
+
+double GetVolumeScale() {
+ StaticMutexAutoLock lock(sMutex);
+ return sVolumeScale;
+}
+
+cubeb* GetCubebContext() {
+ StaticMutexAutoLock lock(sMutex);
+ return GetCubebContextUnlocked();
+}
+
+// This is only exported when running tests.
+void ForceSetCubebContext(cubeb* aCubebContext) {
+ StaticMutexAutoLock lock(sMutex);
+ sCubebContext = aCubebContext;
+ sCubebState = CubebState::Initialized;
+}
+
+void SetInCommunication(bool aInCommunication) {
+#ifdef MOZ_WIDGET_ANDROID
+ StaticMutexAutoLock lock(sMutex);
+ if (aInCommunication) {
+ sInCommunicationCount++;
+ } else {
+ MOZ_ASSERT(sInCommunicationCount > 0);
+ sInCommunicationCount--;
+ }
+
+ if (sInCommunicationCount == 1) {
+ java::GeckoAppShell::SetCommunicationAudioModeOn(true);
+ } else if (sInCommunicationCount == 0) {
+ java::GeckoAppShell::SetCommunicationAudioModeOn(false);
+ }
+#endif
+}
+
+bool InitPreferredSampleRate() {
+ StaticMutexAutoLock lock(sMutex);
+ if (sPreferredSampleRate != 0) {
+ return true;
+ }
+#ifdef MOZ_WIDGET_ANDROID
+ int rate = AndroidGetAudioOutputSampleRate();
+ if (rate > 0) {
+ sPreferredSampleRate = rate;
+ return true;
+ } else {
+ return false;
+ }
+#else
+ cubeb* context = GetCubebContextUnlocked();
+ if (!context) {
+ return false;
+ }
+ uint32_t rate;
+ if (cubeb_get_preferred_sample_rate(context, &rate) != CUBEB_OK) {
+ return false;
+ }
+ sPreferredSampleRate = rate;
+#endif
+ MOZ_ASSERT(sPreferredSampleRate);
+ return true;
+}
+
+uint32_t PreferredSampleRate(bool aShouldResistFingerprinting) {
+ if (sCubebForcedSampleRate) {
+ return sCubebForcedSampleRate;
+ }
+ if (aShouldResistFingerprinting) {
+ return 44100;
+ }
+ if (!InitPreferredSampleRate()) {
+ return 44100;
+ }
+ MOZ_ASSERT(sPreferredSampleRate);
+ return sPreferredSampleRate;
+}
+
+int CubebStreamInit(cubeb* context, cubeb_stream** stream,
+ char const* stream_name, cubeb_devid input_device,
+ cubeb_stream_params* input_stream_params,
+ cubeb_devid output_device,
+ cubeb_stream_params* output_stream_params,
+ uint32_t latency_frames, cubeb_data_callback data_callback,
+ cubeb_state_callback state_callback, void* user_ptr) {
+ uint32_t ms = StaticPrefs::media_cubeb_slow_stream_init_ms();
+ if (ms) {
+ std::this_thread::sleep_for(std::chrono::milliseconds(ms));
+ }
+ return cubeb_stream_init(context, stream, stream_name, input_device,
+ input_stream_params, output_device,
+ output_stream_params, latency_frames, data_callback,
+ state_callback, user_ptr);
+}
+
+void InitBrandName() {
+ if (sBrandName) {
+ return;
+ }
+ nsAutoString brandName;
+ nsCOMPtr<nsIStringBundleService> stringBundleService =
+ mozilla::components::StringBundle::Service();
+ if (stringBundleService) {
+ nsCOMPtr<nsIStringBundle> brandBundle;
+ nsresult rv = stringBundleService->CreateBundle(
+ kBrandBundleURL, getter_AddRefs(brandBundle));
+ if (NS_SUCCEEDED(rv)) {
+ rv = brandBundle->GetStringFromName("brandShortName", brandName);
+ NS_WARNING_ASSERTION(
+ NS_SUCCEEDED(rv),
+ "Could not get the program name for a cubeb stream.");
+ }
+ }
+ NS_LossyConvertUTF16toASCII ascii(brandName);
+ sBrandName = new char[ascii.Length() + 1];
+ PodCopy(sBrandName.get(), ascii.get(), ascii.Length());
+ sBrandName[ascii.Length()] = 0;
+}
+
+#ifdef MOZ_CUBEB_REMOTING
+void InitAudioIPCConnection() {
+ MOZ_ASSERT(NS_IsMainThread());
+ auto contentChild = dom::ContentChild::GetSingleton();
+ auto promise = contentChild->SendCreateAudioIPCConnection();
+ promise->Then(
+ AbstractThread::MainThread(), __func__,
+ [](dom::FileDescOrError&& aFD) {
+ StaticMutexAutoLock lock(sMutex);
+ MOZ_ASSERT(!sIPCConnection);
+ if (aFD.type() == dom::FileDescOrError::Type::TFileDescriptor) {
+ sIPCConnection = new ipc::FileDescriptor(std::move(aFD));
+ } else {
+ MOZ_LOG(gCubebLog, LogLevel::Error,
+ ("SendCreateAudioIPCConnection failed: invalid FD"));
+ }
+ },
+ [](mozilla::ipc::ResponseRejectReason&& aReason) {
+ MOZ_LOG(gCubebLog, LogLevel::Error,
+ ("SendCreateAudioIPCConnection rejected: %d", int(aReason)));
+ });
+}
+#endif
+
+#ifdef MOZ_CUBEB_REMOTING
+ipc::FileDescriptor CreateAudioIPCConnectionUnlocked() {
+ MOZ_ASSERT(sCubebSandbox && XRE_IsParentProcess());
+ if (!sServerHandle) {
+ MOZ_LOG(gCubebLog, LogLevel::Debug, ("Starting cubeb server..."));
+ if (!StartAudioIPCServer()) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("audioipc_server_start failed"));
+ return ipc::FileDescriptor();
+ }
+ }
+ MOZ_LOG(gCubebLog, LogLevel::Debug,
+ ("%s: %d", PREF_AUDIOIPC_SHM_AREA_SIZE, (int)sAudioIPCShmAreaSize));
+ MOZ_ASSERT(sServerHandle);
+ ipc::FileDescriptor::PlatformHandleType rawFD;
+ rawFD = audioipc2::audioipc2_server_new_client(sServerHandle,
+ sAudioIPCShmAreaSize);
+ ipc::FileDescriptor fd(rawFD);
+ if (!fd.IsValid()) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("audioipc_server_new_client failed"));
+ return ipc::FileDescriptor();
+ }
+ // Close rawFD since FileDescriptor's ctor cloned it.
+ // TODO: Find cleaner cross-platform way to close rawFD.
+# ifdef XP_WIN
+ CloseHandle(rawFD);
+# else
+ close(rawFD);
+# endif
+ return fd;
+}
+#endif
+
+ipc::FileDescriptor CreateAudioIPCConnection() {
+#ifdef MOZ_CUBEB_REMOTING
+ StaticMutexAutoLock lock(sMutex);
+ return CreateAudioIPCConnectionUnlocked();
+#else
+ return ipc::FileDescriptor();
+#endif
+}
+
+cubeb* GetCubebContextUnlocked() {
+ sMutex.AssertCurrentThreadOwns();
+ if (sCubebForceNullContext) {
+ // Pref set such that we should return a null context
+ MOZ_LOG(gCubebLog, LogLevel::Debug,
+ ("%s: returning null context due to %s!", __func__,
+ PREF_CUBEB_FORCE_NULL_CONTEXT));
+ return nullptr;
+ }
+ if (sCubebState != CubebState::Uninitialized) {
+ // If we have already passed the initialization point (below), just return
+ // the current context, which may be null (e.g., after error or shutdown.)
+ return sCubebContext;
+ }
+
+ if (!sBrandName && NS_IsMainThread()) {
+ InitBrandName();
+ } else {
+ NS_WARNING_ASSERTION(
+ sBrandName,
+ "Did not initialize sbrandName, and not on the main thread?");
+ }
+
+ int rv = CUBEB_ERROR;
+#ifdef MOZ_CUBEB_REMOTING
+ MOZ_LOG(gCubebLog, LogLevel::Info,
+ ("%s: %s", PREF_CUBEB_SANDBOX, sCubebSandbox ? "true" : "false"));
+
+ if (sCubebSandbox) {
+ if (XRE_IsParentProcess() && !sIPCConnection) {
+ // TODO: Don't use audio IPC when within the same process.
+ auto fd = CreateAudioIPCConnectionUnlocked();
+ if (fd.IsValid()) {
+ sIPCConnection = new ipc::FileDescriptor(fd);
+ }
+ }
+ if (NS_WARN_IF(!sIPCConnection)) {
+ // Either the IPC connection failed to init or we're still waiting for
+ // InitAudioIPCConnection to complete (bug 1454782).
+ return nullptr;
+ }
+
+ MOZ_LOG(gCubebLog, LogLevel::Debug,
+ ("%s: %d", PREF_AUDIOIPC_STACK_SIZE, (int)sAudioIPCStackSize));
+
+ audioipc2::AudioIpcInitParams initParams{};
+ initParams.mStackSize = sAudioIPCStackSize;
+ initParams.mServerConnection =
+ sIPCConnection->ClonePlatformHandle().release();
+ initParams.mThreadCreateCallback = [](const char* aName) {
+ PROFILER_REGISTER_THREAD(aName);
+ };
+ initParams.mThreadDestroyCallback = []() { PROFILER_UNREGISTER_THREAD(); };
+
+ rv = audioipc2::audioipc2_client_init(&sCubebContext, sBrandName,
+ &initParams);
+ } else {
+#endif // MOZ_CUBEB_REMOTING
+#ifdef XP_WIN
+ mozilla::mscom::EnsureMTA([&]() -> void {
+#endif
+ rv = cubeb_init(&sCubebContext, sBrandName, sCubebBackendName);
+#ifdef XP_WIN
+ });
+#endif
+#ifdef MOZ_CUBEB_REMOTING
+ }
+ sIPCConnection = nullptr;
+#endif // MOZ_CUBEB_REMOTING
+ NS_WARNING_ASSERTION(rv == CUBEB_OK, "Could not get a cubeb context.");
+ sCubebState =
+ (rv == CUBEB_OK) ? CubebState::Initialized : CubebState::Uninitialized;
+
+ return sCubebContext;
+}
+
+void ReportCubebBackendUsed() {
+ StaticMutexAutoLock lock(sMutex);
+
+ sAudioStreamInitEverSucceeded = true;
+
+ LABELS_MEDIA_AUDIO_BACKEND label = LABELS_MEDIA_AUDIO_BACKEND::unknown;
+ auto backend =
+ kTelemetryBackendLabel.find(cubeb_get_backend_id(sCubebContext));
+ if (backend != kTelemetryBackendLabel.end()) {
+ label = backend->second;
+ }
+ AccumulateCategorical(label);
+}
+
+void ReportCubebStreamInitFailure(bool aIsFirst) {
+ StaticMutexAutoLock lock(sMutex);
+ if (!aIsFirst && !sAudioStreamInitEverSucceeded) {
+ // This machine has no audio hardware, or it's in really bad shape, don't
+ // send this info, since we want CUBEB_BACKEND_INIT_FAILURE_OTHER to detect
+ // failures to open multiple streams in a process over time.
+ return;
+ }
+ AccumulateCategorical(aIsFirst ? LABELS_MEDIA_AUDIO_INIT_FAILURE::first
+ : LABELS_MEDIA_AUDIO_INIT_FAILURE::other);
+}
+
+uint32_t GetCubebPlaybackLatencyInMilliseconds() {
+ StaticMutexAutoLock lock(sMutex);
+ return sCubebPlaybackLatencyInMilliseconds;
+}
+
+bool CubebPlaybackLatencyPrefSet() {
+ StaticMutexAutoLock lock(sMutex);
+ return sCubebPlaybackLatencyPrefSet;
+}
+
+bool CubebMTGLatencyPrefSet() {
+ StaticMutexAutoLock lock(sMutex);
+ return sCubebMTGLatencyPrefSet;
+}
+
+uint32_t GetCubebMTGLatencyInFrames(cubeb_stream_params* params) {
+ StaticMutexAutoLock lock(sMutex);
+ if (sCubebMTGLatencyPrefSet) {
+ MOZ_ASSERT(sCubebMTGLatencyInFrames > 0);
+ return sCubebMTGLatencyInFrames;
+ }
+
+#ifdef MOZ_WIDGET_ANDROID
+ int frames = AndroidGetAudioOutputFramesPerBuffer();
+ if (frames > 0) {
+ return frames;
+ } else {
+ return 512;
+ }
+#else
+ cubeb* context = GetCubebContextUnlocked();
+ if (!context) {
+ return sCubebMTGLatencyInFrames; // default 512
+ }
+ uint32_t latency_frames = 0;
+ if (cubeb_get_min_latency(context, params, &latency_frames) != CUBEB_OK) {
+ NS_WARNING("Could not get minimal latency from cubeb.");
+ return sCubebMTGLatencyInFrames; // default 512
+ }
+ return latency_frames;
+#endif
+}
+
+static const char* gInitCallbackPrefs[] = {
+ PREF_VOLUME_SCALE, PREF_CUBEB_OUTPUT_DEVICE,
+ PREF_CUBEB_LATENCY_PLAYBACK, PREF_CUBEB_LATENCY_MTG,
+ PREF_CUBEB_BACKEND, PREF_CUBEB_FORCE_NULL_CONTEXT,
+ PREF_CUBEB_SANDBOX, PREF_AUDIOIPC_STACK_SIZE,
+ PREF_AUDIOIPC_SHM_AREA_SIZE, nullptr,
+};
+
+static const char* gCallbackPrefs[] = {
+ PREF_CUBEB_FORCE_SAMPLE_RATE,
+ // We don't want to call the callback on startup, because the pref is the
+ // empty string by default ("", which means "logging disabled"). Because the
+ // logging can be enabled via environment variables (MOZ_LOG="module:5"),
+ // calling this callback on init would immediately re-disable the logging.
+ PREF_CUBEB_LOGGING_LEVEL,
+ nullptr,
+};
+
+void InitLibrary() {
+ Preferences::RegisterCallbacksAndCall(PrefChanged, gInitCallbackPrefs);
+ Preferences::RegisterCallbacks(PrefChanged, gCallbackPrefs);
+
+ if (MOZ_LOG_TEST(gCubebLog, LogLevel::Verbose)) {
+ cubeb_set_log_callback(CUBEB_LOG_VERBOSE, CubebLogCallback);
+ } else if (MOZ_LOG_TEST(gCubebLog, LogLevel::Error)) {
+ cubeb_set_log_callback(CUBEB_LOG_NORMAL, CubebLogCallback);
+ }
+
+#ifndef MOZ_WIDGET_ANDROID
+ NS_DispatchToMainThread(
+ NS_NewRunnableFunction("CubebUtils::InitLibrary", &InitBrandName));
+#endif
+#ifdef MOZ_CUBEB_REMOTING
+ if (sCubebSandbox && XRE_IsContentProcess()) {
+# ifdef XP_LINUX
+ if (atp_set_real_time_limit(0, 48000)) {
+ NS_WARNING("could not set real-time limit in CubebUtils::InitLibrary");
+ }
+ InstallSoftRealTimeLimitHandler();
+# endif
+ InitAudioIPCConnection();
+ }
+#endif
+
+ // Ensure the CallbackThreadRegistry is not created in an audio callback by
+ // creating it now.
+ Unused << CallbackThreadRegistry::Get();
+}
+
+void ShutdownLibrary() {
+ Preferences::UnregisterCallbacks(PrefChanged, gInitCallbackPrefs);
+ Preferences::UnregisterCallbacks(PrefChanged, gCallbackPrefs);
+
+ StaticMutexAutoLock lock(sMutex);
+ cubeb_set_log_callback(CUBEB_LOG_DISABLED, nullptr);
+ if (sCubebContext) {
+ cubeb_destroy(sCubebContext);
+ sCubebContext = nullptr;
+ }
+ sBrandName = nullptr;
+ sCubebBackendName = nullptr;
+ // This will ensure we don't try to re-create a context.
+ sCubebState = CubebState::Shutdown;
+
+#ifdef MOZ_CUBEB_REMOTING
+ sIPCConnection = nullptr;
+ ShutdownAudioIPCServer();
+#endif
+}
+
+bool SandboxEnabled() {
+#ifdef MOZ_CUBEB_REMOTING
+ StaticMutexAutoLock lock(sMutex);
+ return !!sCubebSandbox;
+#else
+ return false;
+#endif
+}
+
+uint32_t MaxNumberOfChannels() {
+ cubeb* cubebContext = GetCubebContext();
+ uint32_t maxNumberOfChannels;
+ if (cubebContext && cubeb_get_max_channel_count(
+ cubebContext, &maxNumberOfChannels) == CUBEB_OK) {
+ return maxNumberOfChannels;
+ }
+
+ return 0;
+}
+
+void GetCurrentBackend(nsAString& aBackend) {
+ cubeb* cubebContext = GetCubebContext();
+ if (cubebContext) {
+ const char* backend = cubeb_get_backend_id(cubebContext);
+ if (backend) {
+ aBackend.AssignASCII(backend);
+ return;
+ }
+ }
+ aBackend.AssignLiteral("unknown");
+}
+
+char* GetForcedOutputDevice() {
+ StaticMutexAutoLock lock(sMutex);
+ return sCubebOutputDeviceName;
+}
+
+cubeb_stream_prefs GetDefaultStreamPrefs(cubeb_device_type aType) {
+ cubeb_stream_prefs prefs = CUBEB_STREAM_PREF_NONE;
+#ifdef XP_WIN
+ if (StaticPrefs::media_cubeb_wasapi_raw() & static_cast<uint32_t>(aType)) {
+ prefs |= CUBEB_STREAM_PREF_RAW;
+ }
+#endif
+ return prefs;
+}
+
+bool RouteOutputAsVoice() { return sRouteOutputAsVoice; }
+
+long datacb(cubeb_stream*, void*, const void*, void* out_buffer, long nframes) {
+ PodZero(static_cast<float*>(out_buffer), nframes * 2);
+ return nframes;
+}
+
+void statecb(cubeb_stream*, void*, cubeb_state) {}
+
+bool EstimatedRoundTripLatencyDefaultDevices(double* aMean, double* aStdDev) {
+ nsTArray<double> roundtripLatencies;
+ // Create a cubeb stream with the correct latency and default input/output
+ // devices (mono/stereo channels). Wait for two seconds, get the latency a few
+ // times.
+ int rv;
+ uint32_t rate;
+ uint32_t latencyFrames;
+ rv = cubeb_get_preferred_sample_rate(GetCubebContext(), &rate);
+ if (rv != CUBEB_OK) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not get preferred rate"));
+ return false;
+ }
+
+ cubeb_stream_params output_params;
+ output_params.format = CUBEB_SAMPLE_FLOAT32NE;
+ output_params.rate = rate;
+ output_params.channels = 2;
+ output_params.layout = CUBEB_LAYOUT_UNDEFINED;
+ output_params.prefs = GetDefaultStreamPrefs(CUBEB_DEVICE_TYPE_OUTPUT);
+
+ latencyFrames = GetCubebMTGLatencyInFrames(&output_params);
+
+ cubeb_stream_params input_params;
+ input_params.format = CUBEB_SAMPLE_FLOAT32NE;
+ input_params.rate = rate;
+ input_params.channels = 1;
+ input_params.layout = CUBEB_LAYOUT_UNDEFINED;
+ input_params.prefs = GetDefaultStreamPrefs(CUBEB_DEVICE_TYPE_INPUT);
+
+ cubeb_stream* stm;
+ rv = cubeb_stream_init(GetCubebContext(), &stm,
+ "about:support latency estimation", NULL,
+ &input_params, NULL, &output_params, latencyFrames,
+ datacb, statecb, NULL);
+ if (rv != CUBEB_OK) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not get init stream"));
+ return false;
+ }
+
+ rv = cubeb_stream_start(stm);
+ if (rv != CUBEB_OK) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not start stream"));
+ return false;
+ }
+ // +-2s
+ for (uint32_t i = 0; i < 40; i++) {
+ std::this_thread::sleep_for(std::chrono::milliseconds(50));
+ uint32_t inputLatency, outputLatency, rvIn, rvOut;
+ rvOut = cubeb_stream_get_latency(stm, &outputLatency);
+ if (rvOut) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not get output latency"));
+ }
+ rvIn = cubeb_stream_get_input_latency(stm, &inputLatency);
+ if (rvIn) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not get input latency"));
+ }
+ if (rvIn != CUBEB_OK || rvOut != CUBEB_OK) {
+ continue;
+ }
+
+ double roundTrip = static_cast<double>(outputLatency + inputLatency) / rate;
+ roundtripLatencies.AppendElement(roundTrip);
+ }
+ rv = cubeb_stream_stop(stm);
+ if (rv != CUBEB_OK) {
+ MOZ_LOG(gCubebLog, LogLevel::Error, ("Could not stop the stream"));
+ }
+
+ *aMean = 0.0;
+ *aStdDev = 0.0;
+ double variance = 0.0;
+ for (uint32_t i = 0; i < roundtripLatencies.Length(); i++) {
+ *aMean += roundtripLatencies[i];
+ }
+
+ *aMean /= roundtripLatencies.Length();
+
+ for (uint32_t i = 0; i < roundtripLatencies.Length(); i++) {
+ variance += pow(roundtripLatencies[i] - *aMean, 2.);
+ }
+ variance /= roundtripLatencies.Length();
+
+ *aStdDev = sqrt(variance);
+
+ MOZ_LOG(gCubebLog, LogLevel::Debug,
+ ("Default device roundtrip latency in seconds %lf (stddev: %lf)",
+ *aMean, *aStdDev));
+
+ cubeb_stream_destroy(stm);
+
+ return true;
+}
+
+#ifdef MOZ_WIDGET_ANDROID
+int32_t AndroidGetAudioOutputSampleRate() {
+ int32_t sample_rate = java::GeckoAppShell::GetAudioOutputSampleRate();
+ return sample_rate;
+}
+int32_t AndroidGetAudioOutputFramesPerBuffer() {
+ int32_t frames = java::GeckoAppShell::GetAudioOutputFramesPerBuffer();
+ return frames;
+}
+#endif
+
+} // namespace CubebUtils
+} // namespace mozilla