1 /* 2 * audio.h 3 * DIN Is Noise is copyright (c) 2006-2021 Jagannathan Sampath 4 * DIN Is Noise is released under GNU Public License 2.0 5 * For more information, please visit https://dinisnoise.org/ 6 */ 7 8 9 #ifndef __AUDIO 10 #define __AUDIO 11 12 #include "RtAudio.h" 13 14 #include <vector> 15 #include <string> 16 17 typedef float sample_t; 18 19 struct audio_out { 20 21 enum {INVALID=-1}; 22 23 // audio devices 24 RtAudio dac; 25 std::vector<RtAudio::DeviceInfo> infos; 26 std::vector<std::string> names; // use @ settings screen 27 int num_devices, default_device, current_device, next_device, last_device; 28 29 // sample rate vars 30 int sample_rate; 31 int samples_per_buffer; // buffer has all channels 32 int samples_channel_size, samples_buffer_size; // in bytes 33 void set_sample_rate (int s); 34 void set_samples_per_channel (int spc); 35 36 // for settings ui 37 int i_sample_rate; 38 void find_sample_rate_id (unsigned int sr); 39 int goto_next_device (int i); 40 int goto_next_sample_rate_id (int i); 41 42 std::string prefs_name; 43 void load_prefs (); 44 void save_prefs (); 45 void defaults (); 46 47 audio_out (); 48 ~audio_out (); 49 50 void alloc (); 51 void probe (); 52 int open (); 53 int open (int id, unsigned int sr, unsigned int spc); 54 int start (); 55 int close (); 56 void list (); 57 58 59 // written by the main thread 60 // 61 // a multi buffer scheme 62 // 63 // main thread writes a buffer, while audio thread streams another to audio card 64 // 65 66 int num_samples_buffers; 67 sample_t * samples_buffers; // a bunch of sample buffers 68 int* available; // buffer available for streaming? 69 70 sample_t *readp, *writep; 71 int readi, writei; can_writeaudio_out72 inline int can_write () {return !available [writei];} 73 74 // reuseable buffers 75 // result, AM, FM, gater, volume, mix, mix alpha, buffer L,R , fader 1,2 76 sample_t *result, *ams, *fms, *gatr, *vol, *mix, *mixa, *bufL, *bufR, *fdr1, *fdr2; 77 78 int num_channels; 79 int samples_per_channel; 80 int last_sample; 81 82 static int audio_wanted (void *ob, void *ib, unsigned int spc, double t, RtAudioStreamStatus status, void *data); 83 84 85 }; 86 87 extern audio_out aout; 88 extern int SAMPLE_RATE; 89 extern float SAMPLE_DURATION; 90 91 #endif 92