audio_input.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 <atomic>
#include <future>
#include <mutex>
#include <chrono>
 
#include "audio_format.h"
#include "media/media_device.h"
#include "media/media_buffer.h"
#include "observer.h"
#include "threadloop.h"
#include "media/media_codec.h"
 
namespace jami {
class AudioDeviceGuard;
class AudioFrameResizer;
class MediaDemuxer;
class MediaDecoder;
class MediaRecorder;
struct MediaStream;
class Resampler;
class RingBuffer;
 
class AudioInput : public Observable<std::shared_ptr<MediaFrame>>
{
public:
    AudioInput(const std::string& id);
    AudioInput(const std::string& id, const std::string& resource);
    ~AudioInput();
 
    std::shared_future<DeviceParams> switchInput(const std::string& resource);
    void start() { loop_.start(); };
 
    bool isCapturing() const { return loop_.isRunning(); }
    void setFormat(const AudioFormat& fmt);
    void setMuted(bool isMuted);
    MediaStream getInfo() const;
    MediaStream getInfo(const std::string& name) const;
    void updateStartTime(int64_t start);
    void setPaused(bool paused);
    void configureFilePlayback(const std::string& path,
                               std::shared_ptr<MediaDemuxer>& demuxer,
                               int index);
    void flushBuffers();
    void setSeekTime(int64_t time);
 
    void setSuccessfulSetupCb(const std::function<void(MediaType, bool)>& cb)
    {
        onSuccessfulSetup_ = cb;
    }
 
    void setRecorderCallback(const std::function<void(const MediaStream& ms)>& cb);
 
    std::string getId() const { return id_; };
 
private:
    void readFromDevice();
    void readFromFile();
    void readFromQueue();
    bool initDevice(const std::string& device);
    bool initFile(const std::string& path);
    bool createDecoder();
    void frameResized(std::shared_ptr<AudioFrame>&& ptr);
 
    std::string id_;
    std::shared_ptr<RingBuffer> ringBuf_;
    bool muteState_ {false};
    uint64_t sent_samples = 0;
    mutable std::mutex fmtMutex_ {};
    AudioFormat format_;
    int frameSize_;
    std::atomic_bool paused_ {true};
 
    std::unique_ptr<Resampler> resampler_;
    std::unique_ptr<AudioFrameResizer> resizer_;
    std::unique_ptr<MediaDecoder> decoder_;
 
    std::string resource_;
    std::mutex resourceMutex_ {};
    DeviceParams devOpts_;
    std::promise<DeviceParams> foundDevOpts_;
    std::shared_future<DeviceParams> futureDevOpts_;
    std::atomic_bool devOptsFound_ {false};
    void foundDevOpts(const DeviceParams& params);
 
    std::atomic_bool playingDevice_ {false};
    std::atomic_bool decodingFile_ {false};
    std::atomic_bool playingFile_ {false};
    std::unique_ptr<AudioDeviceGuard> deviceGuard_;
 
    ThreadLoop loop_;
    void process();
 
    std::chrono::time_point<std::chrono::steady_clock> wakeUp_;
 
    std::function<void(MediaType, bool)> onSuccessfulSetup_;
    std::function<void(const MediaStream& ms)> recorderCallback_;
    std::atomic_bool settingMS_ {true};
};
 
} // namespace jami