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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/audio/android/aaudio_output.h"
#include "base/logging.h"
#include "media/audio/android/aaudio_stubs.h"
#include "media/audio/android/audio_manager_android.h"
#include "media/base/audio_bus.h"
namespace media {
static aaudio_data_callback_result_t OnAudioDataRequestedCallback(
AAudioStream* stream,
void* user_data,
void* audio_data,
int32_t num_frames) {
AAudioOutputStream* output_stream =
reinterpret_cast<AAudioOutputStream*>(user_data);
return output_stream->OnAudioDataRequested(audio_data, num_frames);
}
static void OnStreamErrorCallback(AAudioStream* stream,
void* user_data,
aaudio_result_t error) {
AAudioOutputStream* output_stream =
reinterpret_cast<AAudioOutputStream*>(user_data);
output_stream->OnStreamError(error);
}
AAudioOutputStream::AAudioOutputStream(AudioManagerAndroid* manager,
const AudioParameters& params,
aaudio_usage_t usage)
: audio_manager_(manager),
params_(params),
usage_(usage),
performance_mode_(AAUDIO_PERFORMANCE_MODE_NONE),
ns_per_frame_(base::Time::kNanosecondsPerSecond /
static_cast<double>(params.sample_rate())) {
DCHECK(manager);
DCHECK(params.IsValid());
if (AudioManagerAndroid::SupportsPerformanceModeForOutput()) {
if (params.latency_tag() == AudioLatency::LATENCY_PLAYBACK)
performance_mode_ = AAUDIO_PERFORMANCE_MODE_POWER_SAVING;
else if (params.latency_tag() == AudioLatency::LATENCY_RTC)
performance_mode_ = AAUDIO_PERFORMANCE_MODE_LOW_LATENCY;
}
}
AAudioOutputStream::~AAudioOutputStream() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
}
void AAudioOutputStream::Flush() {}
bool AAudioOutputStream::Open() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
AAudioStreamBuilder* builder;
auto result = AAudio_createStreamBuilder(&builder);
if (AAUDIO_OK != result)
return false;
// Parameters
AAudioStreamBuilder_setDirection(builder, AAUDIO_DIRECTION_OUTPUT);
AAudioStreamBuilder_setSampleRate(builder, params_.sample_rate());
AAudioStreamBuilder_setChannelCount(builder, params_.channels());
AAudioStreamBuilder_setFormat(builder, AAUDIO_FORMAT_PCM_FLOAT);
AAudioStreamBuilder_setUsage(builder, usage_);
AAudioStreamBuilder_setPerformanceMode(builder, performance_mode_);
AAudioStreamBuilder_setBufferCapacityInFrames(builder,
params_.frames_per_buffer());
AAudioStreamBuilder_setFramesPerDataCallback(builder,
params_.frames_per_buffer());
// Callbacks
AAudioStreamBuilder_setDataCallback(builder, OnAudioDataRequestedCallback,
this);
AAudioStreamBuilder_setErrorCallback(builder, OnStreamErrorCallback, this);
result = AAudioStreamBuilder_openStream(builder, &aaudio_stream_);
AAudioStreamBuilder_delete(builder);
if (AAUDIO_OK != result)
return false;
audio_bus_ = AudioBus::Create(params_);
return true;
}
void AAudioOutputStream::Close() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
Stop();
if (aaudio_stream_) {
const auto result = AAudioStream_close(aaudio_stream_);
if (result != AAUDIO_OK) {
DLOG(ERROR) << "Failed to close audio stream, result: "
<< AAudio_convertResultToText(result);
}
}
// Note: This must be last, it will delete |this|.
audio_manager_->ReleaseOutputStream(this);
}
void AAudioOutputStream::Start(AudioSourceCallback* callback) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
DCHECK(aaudio_stream_);
{
base::AutoLock al(lock_);
DCHECK(!callback_);
callback_ = callback;
}
auto result = AAudioStream_requestStart(aaudio_stream_);
if (result != AAUDIO_OK) {
DLOG(ERROR) << "Failed to start audio stream, result: "
<< AAudio_convertResultToText(result);
// Lock is required in case a previous asynchronous requestStop() still has
// not completed by the time we reach this point.
base::AutoLock al(lock_);
callback_->OnError(AudioSourceCallback::ErrorType::kUnknown);
callback_ = nullptr;
}
}
void AAudioOutputStream::Stop() {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
base::AutoLock al(lock_);
if (!callback_ || !aaudio_stream_)
return;
// Note: This call is asynchronous, so we must clear |callback_| under lock
// below to ensure no further calls occur after Stop().
auto result = AAudioStream_requestStop(aaudio_stream_);
if (result != AAUDIO_OK) {
DLOG(ERROR) << "Failed to stop audio stream, result: "
<< AAudio_convertResultToText(result);
callback_->OnError(AudioSourceCallback::ErrorType::kUnknown);
}
callback_ = nullptr;
}
base::TimeDelta AAudioOutputStream::GetDelay(base::TimeTicks delay_timestamp) {
// Get the time that a known audio frame was presented for playing.
int64_t existing_frame_index;
int64_t existing_frame_pts;
auto result =
AAudioStream_getTimestamp(aaudio_stream_, CLOCK_MONOTONIC,
&existing_frame_index, &existing_frame_pts);
if (result != AAUDIO_OK) {
DLOG(ERROR) << "Failed to get audio latency, result: "
<< AAudio_convertResultToText(result);
return base::TimeDelta();
}
// Calculate the number of frames between our known frame and the write index.
const int64_t frame_index_delta =
AAudioStream_getFramesWritten(aaudio_stream_) - existing_frame_index;
// Calculate the time which the next frame will be presented.
const base::TimeDelta next_frame_pts = base::TimeDelta::FromNanosecondsD(
existing_frame_pts + frame_index_delta * ns_per_frame_);
// Calculate the latency between write time and presentation time.
return next_frame_pts - (delay_timestamp - base::TimeTicks());
}
aaudio_data_callback_result_t AAudioOutputStream::OnAudioDataRequested(
void* audio_data,
int32_t num_frames) {
// TODO(tguilbert): This can be downgraded to a DCHECK after we've launched.
CHECK_EQ(num_frames, audio_bus_->frames());
base::AutoLock al(lock_);
if (!callback_)
return AAUDIO_CALLBACK_RESULT_STOP;
const base::TimeTicks delay_timestamp = base::TimeTicks::Now();
const base::TimeDelta delay = GetDelay(delay_timestamp);
const int frames_filled =
callback_->OnMoreData(delay, delay_timestamp, 0, audio_bus_.get());
audio_bus_->Scale(muted_ ? 0.0 : volume_);
audio_bus_->ToInterleaved<Float32SampleTypeTraits>(
frames_filled, reinterpret_cast<float*>(audio_data));
return AAUDIO_CALLBACK_RESULT_CONTINUE;
}
void AAudioOutputStream::OnStreamError(aaudio_result_t error) {
base::AutoLock al(lock_);
// TODO(dalecurtis): Consider sending a translated |error| code.
if (callback_)
callback_->OnError(AudioSourceCallback::ErrorType::kUnknown);
}
void AAudioOutputStream::SetVolume(double volume) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
double volume_override = 0;
if (audio_manager_->HasOutputVolumeOverride(&volume_override))
volume = volume_override;
if (volume < 0.0 || volume > 1.0)
return;
base::AutoLock al(lock_);
volume_ = volume;
}
void AAudioOutputStream::GetVolume(double* volume) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
base::AutoLock al(lock_);
*volume = volume_;
}
void AAudioOutputStream::SetMute(bool muted) {
DCHECK_CALLED_ON_VALID_THREAD(thread_checker_);
base::AutoLock al(lock_);
muted_ = muted;
}
} // namespace media
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