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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 "content/renderer/media/audio_renderer_mixer_manager.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "content/renderer/media/audio_device_factory.h"
#include "content/renderer/media/renderer_audio_output_device.h"
#include "media/base/audio_renderer_mixer.h"
#include "media/base/audio_renderer_mixer_input.h"
namespace content {
AudioRendererMixerManager::AudioRendererMixerManager(int hardware_sample_rate,
int hardware_buffer_size)
: hardware_sample_rate_(hardware_sample_rate),
hardware_buffer_size_(hardware_buffer_size),
sink_for_testing_(NULL) {
}
AudioRendererMixerManager::~AudioRendererMixerManager() {
DCHECK(mixers_.empty());
}
media::AudioRendererMixerInput* AudioRendererMixerManager::CreateInput() {
return new media::AudioRendererMixerInput(
base::Bind(
&AudioRendererMixerManager::GetMixer, base::Unretained(this)),
base::Bind(
&AudioRendererMixerManager::RemoveMixer, base::Unretained(this)));
}
void AudioRendererMixerManager::SetAudioRendererSinkForTesting(
media::AudioRendererSink* sink) {
sink_for_testing_ = sink;
}
media::AudioRendererMixer* AudioRendererMixerManager::GetMixer(
const media::AudioParameters& params) {
base::AutoLock auto_lock(mixers_lock_);
AudioRendererMixerMap::iterator it = mixers_.find(params);
if (it != mixers_.end()) {
it->second.ref_count++;
return it->second.mixer;
}
// Create output parameters based on the audio hardware configuration for
// passing on to the output sink. Force to 16-bit output for now since we
// know that works well for WebAudio and WebRTC.
media::AudioParameters output_params(
media::AudioParameters::AUDIO_PCM_LOW_LATENCY, params.channel_layout(),
hardware_sample_rate_, 16, hardware_buffer_size_);
// If we've created invalid output parameters, simply pass on the input params
// and let the browser side handle automatic fallback.
if (!output_params.IsValid())
output_params = params;
media::AudioRendererMixer* mixer = new media::AudioRendererMixer(
params, output_params,
sink_for_testing_ ?
sink_for_testing_ :
AudioDeviceFactory::NewOutputDevice());
AudioRendererMixerReference mixer_reference = { mixer, 1 };
mixers_[params] = mixer_reference;
return mixer;
}
void AudioRendererMixerManager::RemoveMixer(
const media::AudioParameters& params) {
base::AutoLock auto_lock(mixers_lock_);
AudioRendererMixerMap::iterator it = mixers_.find(params);
DCHECK(it != mixers_.end());
// Only remove the mixer if AudioRendererMixerManager is the last owner.
it->second.ref_count--;
if (it->second.ref_count == 0) {
delete it->second.mixer;
mixers_.erase(it);
}
}
} // namespace content
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