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// Copyright (c) 2010 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/audio/audio_io.h"
#include <windows.h>
#include <mmsystem.h>
#include "base/basictypes.h"
#include "media/audio/fake_audio_input_stream.h"
#include "media/audio/fake_audio_output_stream.h"
#include "media/audio/win/audio_manager_win.h"
#include "media/audio/win/wavein_input_win.h"
#include "media/audio/win/waveout_output_win.h"
#include "media/base/limits.h"
namespace {
// Up to 8 channels can be passed to the driver.
// This should work, given the right drivers, but graceful error handling is
// needed.
const int kWinMaxChannels = 8;
const int kWinMaxInputChannels = 2;
const int kMaxSamplesPerPacket = media::Limits::kMaxSampleRate;
// We use 3 buffers for recording audio so that if a recording callback takes
// some time to return we won't lose audio. More buffers while recording are
// ok because they don't introduce any delay in recording, unlike in playback
// where you first need to fill in that number of buffers before starting to
// play.
const int kNumInputBuffers = 3;
} // namespace.
bool AudioManagerWin::HasAudioOutputDevices() {
return (::waveOutGetNumDevs() != 0);
}
bool AudioManagerWin::HasAudioInputDevices() {
return (::waveInGetNumDevs() != 0);
}
// Factory for the implementations of AudioOutputStream. Two implementations
// should suffice most windows user's needs.
// - PCMWaveOutAudioOutputStream: Based on the waveOutWrite API (in progress)
// - PCMDXSoundAudioOutputStream: Based on DirectSound or XAudio (future work).
AudioOutputStream* AudioManagerWin::MakeAudioOutputStream(
AudioParameters params) {
if (!params.IsValid() || (params.channels > kWinMaxChannels))
return NULL;
if (params.format == AudioParameters::AUDIO_MOCK) {
return FakeAudioOutputStream::MakeFakeStream();
} else if (params.format == AudioParameters::AUDIO_PCM_LINEAR) {
return new PCMWaveOutAudioOutputStream(this, params, 3, WAVE_MAPPER);
} else if (params.format == AudioParameters::AUDIO_PCM_LOW_LATENCY) {
// TODO(cpu): waveout cannot hit 20ms latency. Use other method.
return new PCMWaveOutAudioOutputStream(this, params, 2, WAVE_MAPPER);
}
return NULL;
}
// Factory for the implementations of AudioInputStream.
AudioInputStream* AudioManagerWin::MakeAudioInputStream(
AudioParameters params, int samples_per_packet) {
if (!params.IsValid() || (params.channels > kWinMaxInputChannels) ||
(samples_per_packet > kMaxSamplesPerPacket) || (samples_per_packet < 0))
return NULL;
if (params.format == AudioParameters::AUDIO_MOCK) {
return FakeAudioInputStream::MakeFakeStream(params, samples_per_packet);
} else if (params.format == AudioParameters::AUDIO_PCM_LINEAR) {
return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
samples_per_packet, WAVE_MAPPER);
}
return NULL;
}
void AudioManagerWin::ReleaseOutputStream(PCMWaveOutAudioOutputStream* stream) {
if (stream)
delete stream;
}
void AudioManagerWin::ReleaseInputStream(PCMWaveInAudioInputStream* stream) {
if (stream)
delete stream;
}
void AudioManagerWin::MuteAll() {
}
void AudioManagerWin::UnMuteAll() {
}
AudioManagerWin::~AudioManagerWin() {
}
// static
AudioManager* AudioManager::CreateAudioManager() {
return new AudioManagerWin();
}
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