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// Copyright 2015 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 "chromecast/media/audio/cast_audio_manager.h"
#include "chromecast/media/audio/cast_audio_output_stream.h"
#include "chromecast/media/base/media_message_loop.h"
#include "chromecast/media/cma/backend/media_pipeline_backend_manager.h"
#include "chromecast/public/cast_media_shlib.h"
#include "chromecast/public/media/media_pipeline_backend.h"
namespace {
// TODO(alokp): Query the preferred value from media backend.
const int kDefaultSampleRate = 48000;
// Define bounds for the output buffer size (in frames).
// Note: These values are copied from AudioManagerPulse implementation.
// TODO(alokp): Query the preferred value from media backend.
static const int kMinimumOutputBufferSize = 512;
static const int kMaximumOutputBufferSize = 8192;
static const int kDefaultOutputBufferSize = 2048;
} // namespace
namespace chromecast {
namespace media {
CastAudioManager::CastAudioManager(::media::AudioLogFactory* audio_log_factory)
: AudioManagerBase(audio_log_factory) {}
CastAudioManager::~CastAudioManager() {
Shutdown();
}
bool CastAudioManager::HasAudioOutputDevices() {
return true;
}
bool CastAudioManager::HasAudioInputDevices() {
return false;
}
void CastAudioManager::ShowAudioInputSettings() {
LOG(WARNING) << "No support for input audio devices";
}
void CastAudioManager::GetAudioInputDeviceNames(
::media::AudioDeviceNames* device_names) {
DCHECK(device_names->empty());
LOG(WARNING) << "No support for input audio devices";
}
::media::AudioParameters CastAudioManager::GetInputStreamParameters(
const std::string& device_id) {
LOG(WARNING) << "No support for input audio devices";
// Need to send a valid AudioParameters object even when it will unused.
return ::media::AudioParameters(
::media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
::media::CHANNEL_LAYOUT_STEREO, 48000, 16, 1024);
}
scoped_ptr<MediaPipelineBackend> CastAudioManager::CreateMediaPipelineBackend(
const MediaPipelineDeviceParams& params) {
DCHECK(media::MediaMessageLoop::GetTaskRunner()->BelongsToCurrentThread());
return scoped_ptr<MediaPipelineBackend>(
MediaPipelineBackendManager::CreateMediaPipelineBackend(params));
}
::media::AudioOutputStream* CastAudioManager::MakeLinearOutputStream(
const ::media::AudioParameters& params) {
DCHECK_EQ(::media::AudioParameters::AUDIO_PCM_LINEAR, params.format());
return new CastAudioOutputStream(params, this);
}
::media::AudioOutputStream* CastAudioManager::MakeLowLatencyOutputStream(
const ::media::AudioParameters& params,
const std::string& device_id) {
DCHECK_EQ(::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
return new CastAudioOutputStream(params, this);
}
::media::AudioInputStream* CastAudioManager::MakeLinearInputStream(
const ::media::AudioParameters& params,
const std::string& device_id) {
LOG(WARNING) << "No support for input audio devices";
return nullptr;
}
::media::AudioInputStream* CastAudioManager::MakeLowLatencyInputStream(
const ::media::AudioParameters& params,
const std::string& device_id) {
LOG(WARNING) << "No support for input audio devices";
return nullptr;
}
::media::AudioParameters CastAudioManager::GetPreferredOutputStreamParameters(
const std::string& output_device_id,
const ::media::AudioParameters& input_params) {
::media::ChannelLayout channel_layout = ::media::CHANNEL_LAYOUT_STEREO;
int sample_rate = kDefaultSampleRate;
int buffer_size = kDefaultOutputBufferSize;
int bits_per_sample = 16;
if (input_params.IsValid()) {
// Do not change:
// - the channel layout
// - the number of bits per sample
// We support stereo only with 16 bits per sample.
sample_rate = input_params.sample_rate();
buffer_size = std::min(
kMaximumOutputBufferSize,
std::max(kMinimumOutputBufferSize, input_params.frames_per_buffer()));
}
::media::AudioParameters output_params(
::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
sample_rate, bits_per_sample, buffer_size);
return output_params;
}
} // namespace media
} // namespace chromecast
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