modules/audio_device/linux/audio_device_alsa_linux.h

/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef AUDIO_DEVICE_AUDIO_DEVICE_ALSA_LINUX_H_
#define AUDIO_DEVICE_AUDIO_DEVICE_ALSA_LINUX_H_

#include <memory>

#include "modules/audio_device/audio_device_generic.h"
#include "modules/audio_device/linux/audio_mixer_manager_alsa_linux.h"
#include "rtc_base/criticalsection.h"
#include "rtc_base/platform_thread.h"

#if defined(USE_X11)
#include <X11/Xlib.h>
#endif
#include <alsa/asoundlib.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>


namespace webrtc
{
class EventWrapper;

class AudioDeviceLinuxALSA : public AudioDeviceGeneric
{
public:
    AudioDeviceLinuxALSA();
    virtual ~AudioDeviceLinuxALSA();

    // Retrieve the currently utilized audio layer
    int32_t ActiveAudioLayer(
        AudioDeviceModule::AudioLayer& audioLayer) const override;

    // Main initializaton and termination
    InitStatus Init() override;
    int32_t Terminate() override;
    bool Initialized() const override;

    // Device enumeration
    int16_t PlayoutDevices() override;
    int16_t RecordingDevices() override;
    int32_t PlayoutDeviceName(uint16_t index,
                              char name[kAdmMaxDeviceNameSize],
                              char guid[kAdmMaxGuidSize]) override;
    int32_t RecordingDeviceName(uint16_t index,
                                char name[kAdmMaxDeviceNameSize],
                                char guid[kAdmMaxGuidSize]) override;

    // Device selection
    int32_t SetPlayoutDevice(uint16_t index) override;
    int32_t SetPlayoutDevice(
        AudioDeviceModule::WindowsDeviceType device) override;
    int32_t SetRecordingDevice(uint16_t index) override;
    int32_t SetRecordingDevice(
        AudioDeviceModule::WindowsDeviceType device) override;

    // Audio transport initialization
    int32_t PlayoutIsAvailable(bool& available) override;
    int32_t InitPlayout() override;
    bool PlayoutIsInitialized() const override;
    int32_t RecordingIsAvailable(bool& available) override;
    int32_t InitRecording() override;
    bool RecordingIsInitialized() const override;

    // Audio transport control
    int32_t StartPlayout() override;
    int32_t StopPlayout() override;
    bool Playing() const override;
    int32_t StartRecording() override;
    int32_t StopRecording() override;
    bool Recording() const override;

    // Microphone Automatic Gain Control (AGC)
    int32_t SetAGC(bool enable) override;
    bool AGC() const override;

    // Audio mixer initialization
    int32_t InitSpeaker() override;
    bool SpeakerIsInitialized() const override;
    int32_t InitMicrophone() override;
    bool MicrophoneIsInitialized() const override;

    // Speaker volume controls
    int32_t SpeakerVolumeIsAvailable(bool& available) override;
    int32_t SetSpeakerVolume(uint32_t volume) override;
    int32_t SpeakerVolume(uint32_t& volume) const override;
    int32_t MaxSpeakerVolume(uint32_t& maxVolume) const override;
    int32_t MinSpeakerVolume(uint32_t& minVolume) const override;

    // Microphone volume controls
    int32_t MicrophoneVolumeIsAvailable(bool& available) override;
    int32_t SetMicrophoneVolume(uint32_t volume) override;
    int32_t MicrophoneVolume(uint32_t& volume) const override;
    int32_t MaxMicrophoneVolume(uint32_t& maxVolume) const override;
    int32_t MinMicrophoneVolume(uint32_t& minVolume) const override;

    // Speaker mute control
    int32_t SpeakerMuteIsAvailable(bool& available) override;
    int32_t SetSpeakerMute(bool enable) override;
    int32_t SpeakerMute(bool& enabled) const override;

    // Microphone mute control
    int32_t MicrophoneMuteIsAvailable(bool& available) override;
    int32_t SetMicrophoneMute(bool enable) override;
    int32_t MicrophoneMute(bool& enabled) const override;

    // Stereo support
    int32_t StereoPlayoutIsAvailable(bool& available) override;
    int32_t SetStereoPlayout(bool enable) override;
    int32_t StereoPlayout(bool& enabled) const override;
    int32_t StereoRecordingIsAvailable(bool& available) override;
    int32_t SetStereoRecording(bool enable) override;
    int32_t StereoRecording(bool& enabled) const override;

    // Delay information and control
    int32_t PlayoutDelay(uint16_t& delayMS) const override;

    void AttachAudioBuffer(AudioDeviceBuffer* audioBuffer) override;

private:
    int32_t GetDevicesInfo(const int32_t function,
                           const bool playback,
                           const int32_t enumDeviceNo = 0,
                           char* enumDeviceName = NULL,
                           const int32_t ednLen = 0) const;
    int32_t ErrorRecovery(int32_t error, snd_pcm_t* deviceHandle);

    bool KeyPressed() const;

    void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION(_critSect) { _critSect.Enter(); };
    void UnLock() RTC_UNLOCK_FUNCTION(_critSect) { _critSect.Leave(); };

    inline int32_t InputSanityCheckAfterUnlockedPeriod() const;
    inline int32_t OutputSanityCheckAfterUnlockedPeriod() const;

    static bool RecThreadFunc(void*);
    static bool PlayThreadFunc(void*);
    bool RecThreadProcess();
    bool PlayThreadProcess();

    AudioDeviceBuffer* _ptrAudioBuffer;

    rtc::CriticalSection _critSect;

    // TODO(pbos): Make plain members and start/stop instead of resetting these
    // pointers. A thread can be reused.
    std::unique_ptr<rtc::PlatformThread> _ptrThreadRec;
    std::unique_ptr<rtc::PlatformThread> _ptrThreadPlay;

    AudioMixerManagerLinuxALSA _mixerManager;

    uint16_t _inputDeviceIndex;
    uint16_t _outputDeviceIndex;
    bool _inputDeviceIsSpecified;
    bool _outputDeviceIsSpecified;

    snd_pcm_t* _handleRecord;
    snd_pcm_t* _handlePlayout;

    snd_pcm_uframes_t _recordingBuffersizeInFrame;
    snd_pcm_uframes_t _recordingPeriodSizeInFrame;
    snd_pcm_uframes_t _playoutBufferSizeInFrame;
    snd_pcm_uframes_t _playoutPeriodSizeInFrame;

    ssize_t _recordingBufferSizeIn10MS;
    ssize_t _playoutBufferSizeIn10MS;
    uint32_t _recordingFramesIn10MS;
    uint32_t _playoutFramesIn10MS;

    uint32_t _recordingFreq;
    uint32_t _playoutFreq;
    uint8_t _recChannels;
    uint8_t _playChannels;

    int8_t* _recordingBuffer; // in byte
    int8_t* _playoutBuffer; // in byte
    uint32_t _recordingFramesLeft;
    uint32_t _playoutFramesLeft;

    bool _initialized;
    bool _recording;
    bool _playing;
    bool _recIsInitialized;
    bool _playIsInitialized;
    bool _AGC;

    snd_pcm_sframes_t _recordingDelay;
    snd_pcm_sframes_t _playoutDelay;

    char _oldKeyState[32];
#if defined(USE_X11)
    Display* _XDisplay;
#endif
};

}

#endif  // MODULES_AUDIO_DEVICE_MAIN_SOURCE_LINUX_AUDIO_DEVICE_ALSA_LINUX_H_