Subversion Repositories DIN Is Noise

/*

* audio.h

* DIN Is Noise is copyright (c) 2006-2024 Jagannathan Sampath

* DIN Is Noise is released under GNU Public License 2.0

* For more information, please visit https://dinisnoise.org/

*/

#ifndef __AUDIO

#define __AUDIO

#include "RtAudio.h"

#include <vector>

#include <string>

typedef float sample_t;

struct audio_out {

  enum {INVALID=-1};

  // audio devices

  RtAudio dac;

  std::vector<RtAudio::DeviceInfo> infos;

  std::vector<std::string> names; // use @ settings screen

  int num_devices, default_device, current_device, next_device, last_device;

  // sample rate vars

  int sample_rate;

  int samples_per_buffer; // buffer has all channels

  int samples_channel_size, samples_buffer_size; // in bytes

  void set_sample_rate (int s);

  void set_samples_per_channel (int spc);

  // for settings ui

  int i_sample_rate;

  void find_sample_rate_id (unsigned int sr);

  int goto_next_device (int i);

  int goto_next_sample_rate_id (int i);

  std::string prefs_name;

  void load_prefs ();

  void save_prefs ();

  void defaults ();

  audio_out ();

  ~audio_out ();

  void alloc ();

  void probe ();

  int open ();

  int open (int id, unsigned int sr, unsigned int spc);

  int start ();

  int close ();

  void list ();

  // written by the main thread

  //

  // a multi buffer scheme

  //

  // main thread writes a buffer, while audio thread streams another to audio card

  //

  int num_samples_buffers;

  sample_t * samples_buffers; // a bunch of sample buffers

  int* available; // buffer available for streaming?

  sample_t *readp, *writep;

  int readi, writei;

  inline int can_write () {return !available [writei];}

  // reuseable buffers

  // result, AM, FM, gater, volume, mix, mix alpha, buffer L,R , fader 1,2

  sample_t *result, *ams, *fms, *gatr, *vol, *mix, *mixa, *bufL, *bufR, *fdr1, *fdr2;

  int num_channels;

  int samples_per_channel;

  int last_sample;

  static int audio_wanted (void *ob, void *ib, unsigned int spc, double t, RtAudioStreamStatus status, void *data);

};

extern audio_out aout;

extern int SAMPLE_RATE;

extern float SAMPLE_DURATION;

struct console;

console& operator<< (console& c, const audio_out& ao);

#endif