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// Copyright (c) 2009 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 "chrome/renderer/media/audio_renderer_impl.h"
#include "chrome/renderer/render_view.h"
#include "chrome/renderer/render_thread.h"
#include "chrome/renderer/webmediaplayer_delegate_impl.h"
#include "media/base/filter_host.h"
// We'll try to fill 4096 samples per buffer, which is roughly ~92ms of audio
// data for a 44.1kHz audio source.
static const size_t kSamplesPerBuffer = 4096;
AudioRendererImpl::AudioRendererImpl(WebMediaPlayerDelegateImpl* delegate)
: AudioRendererBase(kDefaultMaxQueueSize),
delegate_(delegate),
stream_id_(0),
shared_memory_(NULL),
shared_memory_size_(0),
packet_requested_(false),
render_loop_(RenderThread::current()->message_loop()),
resource_release_event_(true, false) {
// TODO(hclam): do we need to move this method call to render thread?
delegate_->SetAudioRenderer(this);
}
AudioRendererImpl::~AudioRendererImpl() {
}
bool AudioRendererImpl::IsMediaFormatSupported(
const media::MediaFormat& media_format) {
int channels;
int sample_rate;
int sample_bits;
return ParseMediaFormat(media_format, &channels, &sample_rate, &sample_bits);
}
bool AudioRendererImpl::OnInitialize(const media::MediaFormat& media_format) {
// Parse integer values in MediaFormat.
int channels;
int sample_rate;
int sample_bits;
if (!ParseMediaFormat(media_format, &channels, &sample_rate, &sample_bits)) {
return false;
}
// Create the audio output stream in browser process.
size_t packet_size = kSamplesPerBuffer * channels * sample_bits / 8;
render_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::OnCreateAudioStream,
AudioManager::AUDIO_PCM_LINEAR, channels, sample_rate, sample_bits,
packet_size));
return true;
}
void AudioRendererImpl::OnStop() {
if (!resource_release_event_.IsSignaled()) {
render_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::ReleaseRendererResources));
resource_release_event_.Wait();
}
}
void AudioRendererImpl::OnAssignment(media::Buffer* buffer_in) {
// Use the base class to queue the buffer.
AudioRendererBase::OnAssignment(buffer_in);
// Post a task to render thread to notify a packet reception.
render_loop_->PostTask(FROM_HERE,
NewRunnableMethod(this, &AudioRendererImpl::OnNotifyAudioPacketReady));
}
void AudioRendererImpl::SetPlaybackRate(float rate) {
// TODO(hclam): handle playback rates not equal to 1.0.
if (rate == 1.0f) {
// TODO(hclam): what should I do here? OnCreated has fired StartAudioStream
// in the browser process, it seems there's nothing to do here.
} else {
NOTIMPLEMENTED();
}
}
void AudioRendererImpl::SetVolume(float volume) {
// TODO(hclam): change this to multichannel if possible.
render_loop_->PostTask(FROM_HERE,
NewRunnableMethod(
this, &AudioRendererImpl::OnSetAudioVolume, volume, volume));
}
void AudioRendererImpl::OnCreated(base::SharedMemoryHandle handle,
size_t length) {
shared_memory_.reset(new base::SharedMemory(handle, false));
shared_memory_size_ = length;
// TODO(hclam): is there any better place to do this?
OnStartAudioStream();
}
void AudioRendererImpl::OnRequestPacket() {
packet_requested_ = true;
}
void AudioRendererImpl::OnStateChanged(AudioOutputStream::State state,
int info) {
switch (state) {
case AudioOutputStream::STATE_ERROR:
host_->Error(media::PIPELINE_ERROR_AUDIO_HARDWARE);
break;
// TODO(hclam): handle these events.
case AudioOutputStream::STATE_STARTED:
case AudioOutputStream::STATE_PAUSED:
break;
default:
NOTREACHED();
break;
}
}
void AudioRendererImpl::OnVolume(double left, double right) {
// TODO(hclam): decide whether we need to report the current volume to
// pipeline.
}
void AudioRendererImpl::ReleaseRendererResources() {
OnCloseAudioStream();
resource_release_event_.Signal();
}
void AudioRendererImpl::OnCreateAudioStream(
AudioManager::Format format, int channels, int sample_rate,
int bits_per_sample, size_t packet_size) {
stream_id_ = delegate_->view()->CreateAudioStream(
this, format, channels, sample_rate, bits_per_sample, packet_size);
}
void AudioRendererImpl::OnStartAudioStream() {
delegate_->view()->StartAudioStream(stream_id_);
}
void AudioRendererImpl::OnCloseAudioStream() {
// Unregister ourself from RenderView, we will not be called anymore.
delegate_->view()->CloseAudioStream(stream_id_);
}
void AudioRendererImpl::OnSetAudioVolume(double left, double right) {
delegate_->view()->SetAudioVolume(stream_id_, left, right);
}
void AudioRendererImpl::OnNotifyAudioPacketReady() {
if (packet_requested_) {
DCHECK(shared_memory_.get());
// Fill into the shared memory.
size_t filled = FillBuffer(static_cast<uint8*>(shared_memory_->memory()),
shared_memory_size_);
packet_requested_ = false;
// Then tell browser process we are done filling into the buffer.
delegate_->view()->NotifyAudioPacketReady(stream_id_, filled);
}
}
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