alsalayer.h

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/*
 *  Copyright (C) 2004-2025 Savoir-faire Linux Inc.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program. If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#include "audio/audiolayer.h"
#include "noncopyable.h"
 
#include <alsa/asoundlib.h>
 
#include <memory>
#include <thread>
 
#define PCM_DMIX "plug:dmix" 
// Error codes for error handling
#define ALSA_CAPTURE_DEVICE  0x0001 
#define ALSA_PLAYBACK_DEVICE 0x0010 
namespace jami {
 
class AlsaThread;
class RingBuffer;
class AudioPreference;
 
typedef std::pair<int, std::string> HwIDPair;
 
class AlsaLayer : public AudioLayer
{
public:
    AlsaLayer(const AudioPreference& pref);
 
    ~AlsaLayer();
 
    virtual void startStream(AudioDeviceType stream = AudioDeviceType::ALL);
 
    virtual void stopStream(AudioDeviceType stream = AudioDeviceType::ALL);
 
    std::string buildDeviceTopo(const std::string& plugin, int card);
 
    virtual std::vector<std::string> getCaptureDeviceList() const;
    virtual std::vector<std::string> getPlaybackDeviceList() const;
 
    static bool soundCardIndexExists(int card, AudioDeviceType stream);
 
    int getAudioDeviceIndex(const std::string& description, AudioDeviceType type) const;
    std::string getAudioDeviceName(int index, AudioDeviceType type) const;
 
    void playback();
    void ringtone();
    void capture();
 
    virtual int getIndexCapture() const { return indexIn_; }
 
    virtual int getIndexPlayback() const { return indexOut_; }
 
    virtual int getIndexRingtone() const { return indexRing_; }
 
    void run();
 
private:
    std::vector<HwIDPair> getAudioDeviceIndexMap(bool getCapture) const;
 
    bool openDevice(snd_pcm_t** pcm,
                    const std::string& dev,
                    snd_pcm_stream_t stream,
                    AudioFormat& format);
 
    int indexIn_;
 
    int indexOut_;
 
    int indexRing_;
 
    NON_COPYABLE(AlsaLayer);
 
    void closeCaptureStream();
    void stopCaptureStream();
    void startCaptureStream();
    void prepareCaptureStream();
 
    void closePlaybackStream();
    void stopPlaybackStream();
    void startPlaybackStream();
    void closeRingtoneStream();
 
    bool alsa_set_params(snd_pcm_t* pcm_handle, AudioFormat& format);
 
    void startThread();
    void stopThread();
 
    void write(const AudioFrame& buffer, snd_pcm_t* handle);
 
    std::unique_ptr<AudioFrame> read(unsigned frames);
 
    virtual void updatePreference(AudioPreference& pref, int index, AudioDeviceType type);
 
    snd_pcm_t* playbackHandle_ {nullptr};
 
    snd_pcm_t* ringtoneHandle_ {nullptr};
 
    snd_pcm_t* captureHandle_ {nullptr};
 
    std::string audioPlugin_;
 
    bool is_capture_prepared_ {false};
    bool is_playback_running_ {false};
    bool is_capture_running_ {false};
    bool is_playback_open_ {false};
    bool is_capture_open_ {false};
 
    std::atomic_bool running_ {false};
    std::thread audioThread_;
};
 
} // namespace jami