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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 "base/bind.h"
#include "base/callback_helpers.h"
#include "media/base/audio_renderer_mixer.h"
namespace media {
AudioRendererMixerInput::AudioRendererMixerInput(
const GetMixerCB& get_mixer_cb,
const RemoveMixerCB& remove_mixer_cb,
const std::string& device_id,
const url::Origin& security_origin)
: playing_(false),
initialized_(false),
volume_(1.0f),
get_mixer_cb_(get_mixer_cb),
remove_mixer_cb_(remove_mixer_cb),
device_id_(device_id),
security_origin_(security_origin),
mixer_(NULL),
callback_(NULL),
error_cb_(base::Bind(&AudioRendererMixerInput::OnRenderError,
base::Unretained(this))) {}
AudioRendererMixerInput::~AudioRendererMixerInput() {
DCHECK(!playing_);
DCHECK(!mixer_);
}
void AudioRendererMixerInput::Initialize(
const AudioParameters& params,
AudioRendererSink::RenderCallback* callback) {
DCHECK(callback);
DCHECK(!initialized_);
params_ = params;
callback_ = callback;
initialized_ = true;
}
void AudioRendererMixerInput::Start() {
DCHECK(initialized_);
DCHECK(!playing_);
DCHECK(!mixer_);
mixer_ = get_mixer_cb_.Run(params_, device_id_, security_origin_, nullptr);
if (!mixer_) {
callback_->OnRenderError();
return;
}
// Note: OnRenderError() may be called immediately after this call returns.
mixer_->AddErrorCallback(error_cb_);
if (!pending_switch_callback_.is_null()) {
SwitchOutputDevice(pending_switch_device_id_,
pending_switch_security_origin_,
base::ResetAndReturn(&pending_switch_callback_));
}
}
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.
if (playing_) {
mixer_->RemoveMixerInput(this);
playing_ = false;
}
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_);
remove_mixer_cb_.Run(params_, device_id_, security_origin_);
mixer_ = NULL;
}
if (!pending_switch_callback_.is_null()) {
base::ResetAndReturn(&pending_switch_callback_)
.Run(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
}
}
void AudioRendererMixerInput::Play() {
if (playing_ || !mixer_)
return;
mixer_->AddMixerInput(this);
playing_ = true;
}
void AudioRendererMixerInput::Pause() {
if (!playing_ || !mixer_)
return;
mixer_->RemoveMixerInput(this);
playing_ = false;
}
bool AudioRendererMixerInput::SetVolume(double volume) {
volume_ = volume;
return true;
}
OutputDevice* AudioRendererMixerInput::GetOutputDevice() {
return this;
}
void AudioRendererMixerInput::SwitchOutputDevice(
const std::string& device_id,
const url::Origin& security_origin,
const SwitchOutputDeviceCB& callback) {
if (!mixer_) {
if (pending_switch_callback_.is_null()) {
pending_switch_callback_ = callback;
pending_switch_device_id_ = device_id;
pending_switch_security_origin_ = security_origin;
} else {
callback.Run(OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
}
return;
}
DCHECK(pending_switch_callback_.is_null());
if (device_id == device_id_) {
callback.Run(OUTPUT_DEVICE_STATUS_OK);
return;
}
OutputDeviceStatus new_mixer_status = OUTPUT_DEVICE_STATUS_ERROR_INTERNAL;
AudioRendererMixer* new_mixer =
get_mixer_cb_.Run(params_, device_id, security_origin, &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;
security_origin_ = security_origin;
mixer_ = new_mixer;
mixer_->AddErrorCallback(error_cb_);
if (was_playing)
Play();
callback.Run(OUTPUT_DEVICE_STATUS_OK);
}
AudioParameters AudioRendererMixerInput::GetOutputParameters() {
return mixer_->GetOutputDevice()->GetOutputParameters();
}
OutputDeviceStatus AudioRendererMixerInput::GetDeviceStatus() {
if (!mixer_)
return OUTPUT_DEVICE_STATUS_ERROR_INTERNAL;
return mixer_->GetOutputDevice()->GetDeviceStatus();
}
double AudioRendererMixerInput::ProvideInput(AudioBus* audio_bus,
base::TimeDelta buffer_delay) {
int frames_filled = callback_->Render(
audio_bus, static_cast<int>(buffer_delay.InMillisecondsF() + 0.5));
// AudioConverter expects unfilled frames to be zeroed.
if (frames_filled < audio_bus->frames()) {
audio_bus->ZeroFramesPartial(
frames_filled, audio_bus->frames() - frames_filled);
}
return frames_filled > 0 ? volume_ : 0;
}
void AudioRendererMixerInput::OnRenderError() {
callback_->OnRenderError();
}
} // namespace media
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