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// Copyright (c) 2012 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/base/audio_renderer_mixer_input.h"
#include <cmath>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/trace_event/trace_event.h"
#include "media/base/audio_renderer_mixer.h"
#include "media/base/audio_renderer_mixer_pool.h"
#include "media/base/audio_timestamp_helper.h"
namespace media {
AudioRendererMixerInput::AudioRendererMixerInput(
AudioRendererMixerPool* mixer_pool,
int owner_id,
const std::string& device_id,
AudioLatency::LatencyType latency)
: mixer_pool_(mixer_pool),
started_(false),
playing_(false),
volume_(1.0f),
owner_id_(owner_id),
device_id_(device_id),
latency_(latency),
mixer_(nullptr),
callback_(nullptr),
error_cb_(base::Bind(&AudioRendererMixerInput::OnRenderError,
base::Unretained(this))) {
DCHECK(mixer_pool_);
}
AudioRendererMixerInput::~AudioRendererMixerInput() {
DCHECK(!started_);
DCHECK(!mixer_);
}
void AudioRendererMixerInput::Initialize(
const AudioParameters& params,
AudioRendererSink::RenderCallback* callback) {
DCHECK(!started_);
DCHECK(!mixer_);
DCHECK(callback);
params_ = params;
callback_ = callback;
}
void AudioRendererMixerInput::Start() {
DCHECK(!started_);
DCHECK(!mixer_);
DCHECK(callback_); // Initialized.
started_ = true;
mixer_ =
mixer_pool_->GetMixer(owner_id_, params_, latency_, device_id_, nullptr);
if (!mixer_) {
callback_->OnRenderError();
return;
}
// Note: OnRenderError() may be called immediately after this call returns.
mixer_->AddErrorCallback(error_cb_);
}
void AudioRendererMixerInput::Stop() {
// Stop() may be called at any time, if Pause() hasn't been called we need to
// remove our mixer input before shutdown.
Pause();
if (mixer_) {
// TODO(dalecurtis): This is required so that |callback_| isn't called after
// Stop() by an error event since it may outlive this ref-counted object. We
// should instead have sane ownership semantics: http://crbug.com/151051
mixer_->RemoveErrorCallback(error_cb_);
mixer_pool_->ReturnMixer(mixer_);
mixer_ = nullptr;
}
started_ = false;
}
void AudioRendererMixerInput::Play() {
if (playing_ || !mixer_)
return;
mixer_->AddMixerInput(params_, this);
playing_ = true;
}
void AudioRendererMixerInput::Pause() {
if (!playing_ || !mixer_)
return;
mixer_->RemoveMixerInput(params_, this);
playing_ = false;
}
bool AudioRendererMixerInput::SetVolume(double volume) {
base::AutoLock auto_lock(volume_lock_);
volume_ = volume;
return true;
}
OutputDeviceInfo AudioRendererMixerInput::GetOutputDeviceInfo() {
return mixer_ ? mixer_->GetOutputDeviceInfo()
: mixer_pool_->GetOutputDeviceInfo(
owner_id_, 0 /* session_id */, device_id_);
}
bool AudioRendererMixerInput::IsOptimizedForHardwareParameters() {
return true;
}
bool AudioRendererMixerInput::CurrentThreadIsRenderingThread() {
return mixer_->CurrentThreadIsRenderingThread();
}
void AudioRendererMixerInput::SwitchOutputDevice(
const std::string& device_id,
const OutputDeviceStatusCB& callback) {
if (device_id == device_id_) {
callback.Run(OUTPUT_DEVICE_STATUS_OK);
return;
}
if (mixer_) {
OutputDeviceStatus new_mixer_status = OUTPUT_DEVICE_STATUS_ERROR_INTERNAL;
AudioRendererMixer* new_mixer = mixer_pool_->GetMixer(
owner_id_, params_, latency_, device_id, &new_mixer_status);
if (new_mixer_status != OUTPUT_DEVICE_STATUS_OK) {
callback.Run(new_mixer_status);
return;
}
bool was_playing = playing_;
Stop();
device_id_ = device_id;
mixer_ = new_mixer;
mixer_->AddErrorCallback(error_cb_);
started_ = true;
if (was_playing)
Play();
} else {
OutputDeviceStatus new_mixer_status =
mixer_pool_
->GetOutputDeviceInfo(owner_id_, 0 /* session_id */, device_id)
.device_status();
if (new_mixer_status != OUTPUT_DEVICE_STATUS_OK) {
callback.Run(new_mixer_status);
return;
}
device_id_ = device_id;
}
callback.Run(OUTPUT_DEVICE_STATUS_OK);
}
double AudioRendererMixerInput::ProvideInput(AudioBus* audio_bus,
uint32_t frames_delayed) {
TRACE_EVENT0("audio", "AudioRendererMixerInput::ProvideInput");
const base::TimeDelta delay =
AudioTimestampHelper::FramesToTime(frames_delayed, params_.sample_rate());
int frames_filled =
callback_->Render(delay, base::TimeTicks::Now(), 0, audio_bus);
// AudioConverter expects unfilled frames to be zeroed.
if (frames_filled < audio_bus->frames()) {
audio_bus->ZeroFramesPartial(
frames_filled, audio_bus->frames() - frames_filled);
}
// We're reading |volume_| from the audio device thread and must avoid racing
// with the main/media thread calls to SetVolume(). See thread safety comment
// in the header file.
{
base::AutoLock auto_lock(volume_lock_);
return frames_filled > 0 ? volume_ : 0;
}
}
void AudioRendererMixerInput::OnRenderError() {
callback_->OnRenderError();
}
} // namespace media
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