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gecko-dev/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 "MediaInfo.h"
#include "mozilla/AbstractThread.h"
#include "mozilla/Logging.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "mozilla/Sprintf.h"
#include "mozilla/StaticMutex.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/Telemetry.h"
#include "nsAutoRef.h"
#include "nsDebug.h"
#include "nsIStringBundle.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "prdtoa.h"
#include <algorithm>
#include <stdint.h>
#define PREF_VOLUME_SCALE "media.volume_scale"
#define PREF_CUBEB_BACKEND "media.cubeb.backend"
#define PREF_CUBEB_LATENCY_PLAYBACK "media.cubeb_latency_playback_ms"
#define PREF_CUBEB_LATENCY_MSG "media.cubeb_latency_msg_frames"
#define PREF_CUBEB_LOGGING_LEVEL "media.cubeb.logging_level"
#define PREF_CUBEB_SANDBOX "media.cubeb.sandbox"
#define MASK_MONO (1 << AudioConfig::CHANNEL_MONO)
#define MASK_MONO_LFE (MASK_MONO | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_STEREO ((1 << AudioConfig::CHANNEL_LEFT) | (1 << AudioConfig::CHANNEL_RIGHT))
#define MASK_STEREO_LFE (MASK_STEREO | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_3F (MASK_STEREO | (1 << AudioConfig::CHANNEL_CENTER))
#define MASK_3F_LFE (MASK_3F | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_2F1 (MASK_STEREO | (1 << AudioConfig::CHANNEL_RCENTER))
#define MASK_2F1_LFE (MASK_2F1 | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_3F1 (MASK_3F | (1 < AudioConfig::CHANNEL_RCENTER))
#define MASK_3F1_LFE (MASK_3F1 | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_2F2 (MASK_STEREO | (1 << AudioConfig::CHANNEL_LS) | (1 << AudioConfig::CHANNEL_RS))
#define MASK_2F2_LFE (MASK_2F2 | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_3F2 (MASK_3F | (1 << AudioConfig::CHANNEL_LS) | (1 << AudioConfig::CHANNEL_RS))
#define MASK_3F2_LFE (MASK_3F2 | (1 << AudioConfig::CHANNEL_LFE))
#define MASK_3F3R_LFE (MASK_3F2_LFE | (1 << AudioConfig::CHANNEL_RCENTER))
#define MASK_3F4_LFE (MASK_3F2_LFE | (1 << AudioConfig::CHANNEL_RLS) | (1 << AudioConfig::CHANNEL_RRS))
extern "C" {
// These functions are provided by audioipc-server crate
extern void* audioipc_server_start();
extern void audioipc_server_stop(void*);
// These functions are provided by audioipc-client crate
extern int audioipc_client_init(cubeb**, const char*);
}
namespace mozilla {
namespace {
#ifdef MOZ_CUBEB_REMOTING
////////////////////////////////////////////////////////////////////////////////
// Cubeb Sound Server Thread
void* sServerHandle = nullptr;
static bool
StartSoundServer()
{
sServerHandle = audioipc_server_start();
return sServerHandle != nullptr;
}
static void
ShutdownSoundServer()
{
if (!sServerHandle)
return;
audioipc_server_stop(sServerHandle);
sServerHandle = nullptr;
}
#endif // MOZ_CUBEB_REMOTING
////////////////////////////////////////////////////////////////////////////////
LazyLogModule gCubebLog("cubeb");
void CubebLogCallback(const char* aFmt, ...)
{
char buffer[256];
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 sCubebMSGLatencyInFrames = 512;
bool sCubebPlaybackLatencyPrefSet;
bool sCubebMSGLatencyPrefSet;
bool sAudioStreamInitEverSucceeded = false;
#ifdef MOZ_CUBEB_REMOTING
bool sCubebSandbox;
#endif
StaticAutoPtr<char> sBrandName;
StaticAutoPtr<char> sCubebBackendName;
const char kBrandBundleURL[] = "chrome://branding/locale/brand.properties";
const char* AUDIOSTREAM_BACKEND_ID_STR[] = {
"jack",
"pulse",
"alsa",
"audiounit",
"audioqueue",
"wasapi",
"winmm",
"directsound",
"sndio",
"opensl",
"audiotrack",
"kai"
};
/* Index for failures to create an audio stream the first time. */
const int CUBEB_BACKEND_INIT_FAILURE_FIRST =
ArrayLength(AUDIOSTREAM_BACKEND_ID_STR);
/* Index for failures to create an audio stream after the first time */
const int CUBEB_BACKEND_INIT_FAILURE_OTHER = CUBEB_BACKEND_INIT_FAILURE_FIRST + 1;
/* Index for an unknown backend. */
const int CUBEB_BACKEND_UNKNOWN = CUBEB_BACKEND_INIT_FAILURE_FIRST + 2;
typedef struct {
const char* name;
const unsigned int channels;
const uint32_t mask;
} layoutInfo;
const layoutInfo kLayoutInfos[CUBEB_LAYOUT_MAX] = {
{ "undefined", 0, 0 }, // CUBEB_LAYOUT_UNDEFINED
{ "dual mono", 2, MASK_STEREO }, // CUBEB_LAYOUT_DUAL_MONO
{ "dual mono lfe", 3, MASK_STEREO_LFE }, // CUBEB_LAYOUT_DUAL_MONO_LFE
{ "mono", 1, MASK_MONO }, // CUBEB_LAYOUT_MONO
{ "mono lfe", 2, MASK_MONO_LFE }, // CUBEB_LAYOUT_MONO_LFE
{ "stereo", 2, MASK_STEREO }, // CUBEB_LAYOUT_STEREO
{ "stereo lfe", 3, MASK_STEREO_LFE }, // CUBEB_LAYOUT_STEREO_LFE
{ "3f", 3, MASK_3F }, // CUBEB_LAYOUT_3F
{ "3f lfe", 4, MASK_3F_LFE }, // CUBEB_LAYOUT_3F_LFE
{ "2f1", 3, MASK_2F1 }, // CUBEB_LAYOUT_2F1
{ "2f1 lfe", 4, MASK_2F1_LFE }, // CUBEB_LAYOUT_2F1_LFE
{ "3f1", 4, MASK_3F1 }, // CUBEB_LAYOUT_3F1
{ "3f1 lfe", 5, MASK_3F1_LFE }, // CUBEB_LAYOUT_3F1_LFE
{ "2f2", 4, MASK_2F2_LFE }, // CUBEB_LAYOUT_2F2
{ "2f2 lfe", 5, MASK_2F2_LFE }, // CUBEB_LAYOUT_2F2_LFE
{ "3f2", 5, MASK_3F2 }, // CUBEB_LAYOUT_3F2
{ "3f2 lfe", 6, MASK_3F2_LFE }, // CUBEB_LAYOUT_3F2_LFE
{ "3f3r lfe", 7, MASK_3F3R_LFE }, // CUBEB_LAYOUT_3F3R_LFE
{ "3f4 lfe", 8, MASK_3F4_LFE } // CUBEB_LAYOUT_3F4_LFE
};
// 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.
uint32_t sPreferredSampleRate;
// We only support SMPTE layout in cubeb for now. If the value is
// CUBEB_LAYOUT_UNDEFINED, then it implies that the preferred layout is
// non-SMPTE format.
cubeb_channel_layout sPreferredChannelLayout;
} // 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 {
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) {
// 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);
StaticMutexAutoLock lock(sMutex);
sCubebPlaybackLatencyInMilliseconds = std::min<uint32_t>(std::max<uint32_t>(value, 1), 1000);
} else if (strcmp(aPref, PREF_CUBEB_LATENCY_MSG) == 0) {
sCubebMSGLatencyPrefSet = Preferences::HasUserValue(aPref);
uint32_t value = Preferences::GetUint(aPref, CUBEB_NORMAL_LATENCY_FRAMES);
StaticMutexAutoLock lock(sMutex);
// 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.
sCubebMSGLatencyInFrames = std::min<uint32_t>(std::max<uint32_t>(value, 128), 1e6);
} else if (strcmp(aPref, PREF_CUBEB_LOGGING_LEVEL) == 0) {
nsAutoCString value;
Preferences::GetCString(aPref, value);
LogModule* cubebLog = LogModule::Get("cubeb");
if (value.EqualsLiteral("verbose")) {
cubeb_set_log_callback(CUBEB_LOG_VERBOSE, CubebLogCallback);
cubebLog->SetLevel(LogLevel::Verbose);
} else if (value.EqualsLiteral("normal")) {
cubeb_set_log_callback(CUBEB_LOG_NORMAL, CubebLogCallback);
cubebLog->SetLevel(LogLevel::Error);
} else if (value.IsEmpty()) {
cubeb_set_log_callback(CUBEB_LOG_DISABLED, nullptr);
cubebLog->SetLevel(LogLevel::Disabled);
}
} else if (strcmp(aPref, PREF_CUBEB_BACKEND) == 0) {
nsAutoCString value;
Preferences::GetCString(aPref, value);
if (value.IsEmpty()) {
sCubebBackendName = nullptr;
} else {
sCubebBackendName = new char[value.Length() + 1];
PodCopy(sCubebBackendName.get(), value.get(), value.Length());
sCubebBackendName[value.Length()] = 0;
}
}
#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"));
if (sCubebSandbox && !sServerHandle && XRE_IsParentProcess()) {
MOZ_LOG(gCubebLog, LogLevel::Debug, ("Starting cubeb server..."));
StartSoundServer();
}
}
#endif
}
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();
}
bool InitPreferredSampleRate()
{
StaticMutexAutoLock lock(sMutex);
if (sPreferredSampleRate != 0) {
return true;
}
cubeb* context = GetCubebContextUnlocked();
if (!context) {
return false;
}
if (cubeb_get_preferred_sample_rate(context,
&sPreferredSampleRate) != CUBEB_OK) {
return false;
}
MOZ_ASSERT(sPreferredSampleRate);
return true;
}
uint32_t PreferredSampleRate()
{
if (!InitPreferredSampleRate()) {
return 44100;
}
MOZ_ASSERT(sPreferredSampleRate);
return sPreferredSampleRate;
}
bool InitPreferredChannelLayout()
{
{
StaticMutexAutoLock lock(sMutex);
if (sPreferredChannelLayout != 0) {
return true;
}
}
cubeb* context = GetCubebContext();
if (!context) {
return false;
}
// Favor calling cubeb api with the mutex unlock, potential deadlock.
cubeb_channel_layout layout;
if (cubeb_get_preferred_channel_layout(context, &layout) != CUBEB_OK) {
return false;
}
StaticMutexAutoLock lock(sMutex);
sPreferredChannelLayout = layout;
return true;
}
uint32_t PreferredChannelMap(uint32_t aChannels)
{
// Use SMPTE default channel map if we can't get preferred layout
// or the channel counts of preferred layout is different from input's one
if (!InitPreferredChannelLayout() ||
kLayoutInfos[sPreferredChannelLayout].channels != aChannels) {
AudioConfig::ChannelLayout smpteLayout(aChannels);
return smpteLayout.Map();
}
return kLayoutInfos[sPreferredChannelLayout].mask;
}
void InitBrandName()
{
if (sBrandName) {
return;
}
nsAutoString brandName;
nsCOMPtr<nsIStringBundleService> stringBundleService =
mozilla::services::GetStringBundleService();
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;
}
cubeb* GetCubebContextUnlocked()
{
sMutex.AssertCurrentThreadOwns();
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?");
}
#ifdef MOZ_CUBEB_REMOTING
MOZ_LOG(gCubebLog, LogLevel::Info, ("%s: %s", PREF_CUBEB_SANDBOX, sCubebSandbox ? "true" : "false"));
int rv = sCubebSandbox
? audioipc_client_init(&sCubebContext, sBrandName)
: cubeb_init(&sCubebContext, sBrandName, sCubebBackendName.get());
#else // !MOZ_CUBEB_REMOTING
int rv = cubeb_init(&sCubebContext, sBrandName, sCubebBackendName.get());
#endif // MOZ_CUBEB_REMOTING
NS_WARNING_ASSERTION(rv == CUBEB_OK, "Could not get a cubeb context.");
sCubebState = (rv == CUBEB_OK) ? CubebState::Initialized : CubebState::Uninitialized;
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);
}
return sCubebContext;
}
void ReportCubebBackendUsed()
{
StaticMutexAutoLock lock(sMutex);
sAudioStreamInitEverSucceeded = true;
bool foundBackend = false;
for (uint32_t i = 0; i < ArrayLength(AUDIOSTREAM_BACKEND_ID_STR); i++) {
if (!strcmp(cubeb_get_backend_id(sCubebContext), AUDIOSTREAM_BACKEND_ID_STR[i])) {
Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED, i);
foundBackend = true;
}
}
if (!foundBackend) {
Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED,
CUBEB_BACKEND_UNKNOWN);
}
}
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;
}
Telemetry::Accumulate(Telemetry::AUDIOSTREAM_BACKEND_USED,
aIsFirst ? CUBEB_BACKEND_INIT_FAILURE_FIRST
: CUBEB_BACKEND_INIT_FAILURE_OTHER);
}
uint32_t GetCubebPlaybackLatencyInMilliseconds()
{
StaticMutexAutoLock lock(sMutex);
return sCubebPlaybackLatencyInMilliseconds;
}
bool CubebPlaybackLatencyPrefSet()
{
StaticMutexAutoLock lock(sMutex);
return sCubebPlaybackLatencyPrefSet;
}
bool CubebMSGLatencyPrefSet()
{
StaticMutexAutoLock lock(sMutex);
return sCubebMSGLatencyPrefSet;
}
Maybe<uint32_t> GetCubebMSGLatencyInFrames()
{
StaticMutexAutoLock lock(sMutex);
if (!sCubebMSGLatencyPrefSet) {
return Maybe<uint32_t>();
}
MOZ_ASSERT(sCubebMSGLatencyInFrames > 0);
return Some(sCubebMSGLatencyInFrames);
}
void InitLibrary()
{
Preferences::RegisterCallbackAndCall(PrefChanged, PREF_VOLUME_SCALE);
Preferences::RegisterCallbackAndCall(PrefChanged, PREF_CUBEB_LATENCY_PLAYBACK);
Preferences::RegisterCallbackAndCall(PrefChanged, PREF_CUBEB_LATENCY_MSG);
Preferences::RegisterCallbackAndCall(PrefChanged, PREF_CUBEB_BACKEND);
Preferences::RegisterCallbackAndCall(PrefChanged, PREF_CUBEB_SANDBOX);
// 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-disble the logging.
Preferences::RegisterCallback(PrefChanged, PREF_CUBEB_LOGGING_LEVEL);
#ifndef MOZ_WIDGET_ANDROID
AbstractThread::MainThread()->Dispatch(
NS_NewRunnableFunction("CubebUtils::InitLibrary", &InitBrandName));
#endif
}
void ShutdownLibrary()
{
Preferences::UnregisterCallback(PrefChanged, PREF_VOLUME_SCALE);
Preferences::UnregisterCallback(PrefChanged, PREF_CUBEB_SANDBOX);
Preferences::UnregisterCallback(PrefChanged, PREF_CUBEB_BACKEND);
Preferences::UnregisterCallback(PrefChanged, PREF_CUBEB_LATENCY_PLAYBACK);
Preferences::UnregisterCallback(PrefChanged, PREF_CUBEB_LATENCY_MSG);
Preferences::UnregisterCallback(PrefChanged, PREF_CUBEB_LOGGING_LEVEL);
StaticMutexAutoLock lock(sMutex);
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
ShutdownSoundServer();
#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;
}
cubeb_channel_layout ConvertChannelMapToCubebLayout(uint32_t aChannelMap)
{
switch(aChannelMap) {
case MASK_MONO: return CUBEB_LAYOUT_MONO;
case MASK_MONO_LFE: return CUBEB_LAYOUT_MONO_LFE;
case MASK_STEREO: return CUBEB_LAYOUT_STEREO;
case MASK_STEREO_LFE: return CUBEB_LAYOUT_STEREO_LFE;
case MASK_3F: return CUBEB_LAYOUT_3F;
case MASK_3F_LFE: return CUBEB_LAYOUT_3F_LFE;
case MASK_2F1: return CUBEB_LAYOUT_2F1;
case MASK_2F1_LFE: return CUBEB_LAYOUT_2F1_LFE;
case MASK_3F1: return CUBEB_LAYOUT_3F1;
case MASK_3F1_LFE: return CUBEB_LAYOUT_3F1_LFE;
case MASK_2F2: return CUBEB_LAYOUT_2F2;
case MASK_2F2_LFE: return CUBEB_LAYOUT_2F2_LFE;
case MASK_3F2: return CUBEB_LAYOUT_3F2;
case MASK_3F2_LFE: return CUBEB_LAYOUT_3F2_LFE;
case MASK_3F3R_LFE: return CUBEB_LAYOUT_3F3R_LFE;
case MASK_3F4_LFE: return CUBEB_LAYOUT_3F4_LFE;
default:
NS_ERROR("The channel map is unsupported");
return CUBEB_LAYOUT_UNDEFINED;
}
}
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");
}
void GetPreferredChannelLayout(nsAString& aLayout)
{
const char* layout = InitPreferredChannelLayout() ?
kLayoutInfos[sPreferredChannelLayout].name : "unknown";
aLayout.AssignASCII(layout);
}
uint16_t ConvertCubebType(cubeb_device_type aType)
{
uint16_t map[] = {
nsIAudioDeviceInfo::TYPE_UNKNOWN, // CUBEB_DEVICE_TYPE_UNKNOWN
nsIAudioDeviceInfo::TYPE_INPUT, // CUBEB_DEVICE_TYPE_INPUT,
nsIAudioDeviceInfo::TYPE_OUTPUT // CUBEB_DEVICE_TYPE_OUTPUT
};
return map[aType];
}
uint16_t ConvertCubebState(cubeb_device_state aState)
{
uint16_t map[] = {
nsIAudioDeviceInfo::STATE_DISABLED, // CUBEB_DEVICE_STATE_DISABLED
nsIAudioDeviceInfo::STATE_UNPLUGGED, // CUBEB_DEVICE_STATE_UNPLUGGED
nsIAudioDeviceInfo::STATE_ENABLED // CUBEB_DEVICE_STATE_ENABLED
};
return map[aState];
}
uint16_t ConvertCubebPreferred(cubeb_device_pref aPreferred)
{
if (aPreferred == CUBEB_DEVICE_PREF_NONE) {
return nsIAudioDeviceInfo::PREF_NONE;
} else if (aPreferred == CUBEB_DEVICE_PREF_ALL) {
return nsIAudioDeviceInfo::PREF_ALL;
}
uint16_t preferred = 0;
if (aPreferred & CUBEB_DEVICE_PREF_MULTIMEDIA) {
preferred |= nsIAudioDeviceInfo::PREF_MULTIMEDIA;
}
if (aPreferred & CUBEB_DEVICE_PREF_VOICE) {
preferred |= nsIAudioDeviceInfo::PREF_VOICE;
}
if (aPreferred & CUBEB_DEVICE_PREF_NOTIFICATION) {
preferred |= nsIAudioDeviceInfo::PREF_NOTIFICATION;
}
return preferred;
}
uint16_t ConvertCubebFormat(cubeb_device_fmt aFormat)
{
uint16_t format = 0;
if (aFormat & CUBEB_DEVICE_FMT_S16LE) {
format |= nsIAudioDeviceInfo::FMT_S16LE;
}
if (aFormat & CUBEB_DEVICE_FMT_S16BE) {
format |= nsIAudioDeviceInfo::FMT_S16BE;
}
if (aFormat & CUBEB_DEVICE_FMT_F32LE) {
format |= nsIAudioDeviceInfo::FMT_F32LE;
}
if (aFormat & CUBEB_DEVICE_FMT_F32BE) {
format |= nsIAudioDeviceInfo::FMT_F32BE;
}
return format;
}
void GetDeviceCollection(nsTArray<RefPtr<AudioDeviceInfo>>& aDeviceInfos,
Side aSide)
{
cubeb* context = GetCubebContext();
if (context) {
cubeb_device_collection collection = { nullptr, 0 };
if (cubeb_enumerate_devices(context,
aSide == Input ? CUBEB_DEVICE_TYPE_INPUT :
CUBEB_DEVICE_TYPE_OUTPUT,
&collection) == CUBEB_OK) {
for (unsigned int i = 0; i < collection.count; ++i) {
auto device = collection.device[i];
RefPtr<AudioDeviceInfo> info =
new AudioDeviceInfo(NS_ConvertUTF8toUTF16(device.friendly_name),
NS_ConvertUTF8toUTF16(device.group_id),
NS_ConvertUTF8toUTF16(device.vendor_name),
ConvertCubebType(device.type),
ConvertCubebState(device.state),
ConvertCubebPreferred(device.preferred),
ConvertCubebFormat(device.format),
ConvertCubebFormat(device.default_format),
device.max_channels,
device.default_rate,
device.max_rate,
device.min_rate,
device.latency_hi,
device.latency_lo);
aDeviceInfos.AppendElement(info);
}
}
cubeb_device_collection_destroy(context, &collection);
}
}
} // namespace CubebUtils
} // namespace mozilla
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