72 lines
2.3 KiB
C++
72 lines
2.3 KiB
C++
//
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// Created by david on 01.02.2026.
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//
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#ifndef LOCKSTEP_PLAYBACKENGINE_H
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#define LOCKSTEP_PLAYBACKENGINE_H
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#include "StepListener.h"
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#include "MixingPlayer.h"
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#include "RubberBandStretcher.h"
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#include "mp3file.h"
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#include "AudioCallback.h"
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#include <string>
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#include <thread>
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#include <memory>
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#include <atomic>
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/** Provides music through a regular callback to oboe. Called from separate oboe thread. */
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class MusicProvider : public AudioCallbackProvider {
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public:
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explicit MusicProvider(RubberBand::RubberBandStretcher *stretcher, size_t buf_size_samples, int num_ch_out, std::atomic<int> *back_pressure);
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~MusicProvider() override;
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/** Called from separate oboe thread. */
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void onAudioReady(float *data, int32_t frames) override;
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private:
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RubberBand::RubberBandStretcher *stretcher;
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float *buf;
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float **buf_ptr;
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int idebug;
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size_t buf_size_samples;
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int num_ch_out;
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/** contains the current available() frames from 'stretcher' in the audio callback thread 2 (oboe) */
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std::atomic<int> *back_pressure;
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};
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class PlaybackEngine : public StepListener {
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public:
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PlaybackEngine(std::string filesDir, int resid);
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virtual ~PlaybackEngine();
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/** Play a beat sound. */
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virtual void playBeat();
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void playMusic(int fd);
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private:
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RubberBand::RubberBandStretcher stretcher;
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MixingPlayer *mPlayer;
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std::string mFilesDir;
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std::unique_ptr<MP3File> musicFile;
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std::atomic<bool> haveMusicFile;
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std::unique_ptr<std::thread> musicFeed;
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std::atomic<bool> exitMusicFeedThread;
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/** where musicFeedThread() keeps track of the fact that we have music set -- will start the audio cb */
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std::atomic<bool> isSetMusic;
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int android_fd;
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std::atomic<bool> haveTimeRatio;
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std::atomic<double> timeRatio;
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std::atomic<int> playbackRate;
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std::atomic<int> numOutChannels;
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std::atomic<int> numInChannels;
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/** contains the current available() frames from 'stretcher' in the audio callback thread 2 (oboe) */
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std::atomic<int> back_pressure;
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/** this is actually in frames, not samples */
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static size_t constexpr buf_size_samples = 1024;
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void initRubberBand();
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void closeRubberBand();
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void closeMusicFile();
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void musicFeedThread();
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void mapChannels(int *channel_map, int num_ch_in, int num_ch_out);
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};
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#endif //LOCKSTEP_PLAYBACKENGINE_H
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