audio_soundio.c

   1 #include "audio.h"
   2 #include "common.h"
   3 #include <memory.h>
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7
   8 #include <soundio/soundio.h>
   9
  10 int Fs;
  11 long long starttime, samples_played;
  12
  13 struct SoundIoOutStream *outstream;
  14 struct SoundIo *soundio;
  15 struct SoundIoDevice *device;
  16 struct SoundIoRingBuffer *ring_buffer = NULL;
  17
  18 static int min_int(int a, int b) { return (a < b) ? a : b; }
  19
  20 static void write_callback(struct SoundIoOutStream *outstream, int frame_count_min,
  21                            int frame_count_max) {
  22   struct SoundIoChannelArea *areas;
  23   // int frame_count;
  24   int err;
  25
  26   char *read_ptr = soundio_ring_buffer_read_ptr(ring_buffer);
  27   int fill_bytes = soundio_ring_buffer_fill_count(ring_buffer);
  28   int fill_count = fill_bytes / outstream->bytes_per_frame;
  29
  30   debug(3, "[--->>] frame_count_min: %d , frame_count_max: %d , fill_bytes: %d , fill_count: %d , "
  31            "outstream->bytes_per_frame: %d",
  32         frame_count_min, frame_count_max, fill_bytes, fill_count, outstream->bytes_per_frame);
  33
  34   if (frame_count_min > fill_count) {
  35     int frame_count = frame_count_min;
  36     if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) {
  37       debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
  38     }
  39     for (int frame = 0; frame < frame_count; frame += 1) {
  40       for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
  41         memset(areas[ch].ptr, 0, outstream->bytes_per_sample);
  42         areas[ch].ptr += areas[ch].step;
  43       }
  44     }
  45     if ((err = soundio_outstream_end_write(outstream)))
  46       debug(0, "[--->>] end write error: %s", soundio_strerror(err));
  47     return;
  48   }
  49
  50   int read_count = min_int(frame_count_max, fill_count);
  51   int frames_left = read_count;
  52
  53   while (frames_left > 0) {
  54     int frame_count = frames_left;
  55
  56     if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count)))
  57       debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
  58
  59     if (frame_count <= 0)
  60       break;
  61
  62     for (int frame = 0; frame < frame_count; frame += 1) {
  63       for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
  64         memcpy(areas[ch].ptr, read_ptr, outstream->bytes_per_sample);
  65         areas[ch].ptr += areas[ch].step;
  66         read_ptr += outstream->bytes_per_sample;
  67       }
  68     }
  69
  70     if ((err = soundio_outstream_end_write(outstream)))
  71       debug(0, "[--->>] end write error: %s", soundio_strerror(err));
  72
  73     frames_left -= frame_count;
  74   }
  75
  76   debug(3, "[--->>]  Wrote: %d", read_count * outstream->bytes_per_frame);
  77   soundio_ring_buffer_advance_read_ptr(ring_buffer, read_count * outstream->bytes_per_frame);
  78 }
  79
  80 static void underflow_callback(__attribute__((unused)) struct SoundIoOutStream *outstream) {
  81   static int count = 0;
  82   debug(0, "underflow %d\n", ++count);
  83 }
  84
  85 static int init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) {
  86   int err;
  87
  88   config.audio_backend_buffer_desired_length = 2.0;
  89   config.audio_backend_latency_offset = 0;
  90
  91   // get settings from settings file
  92
  93   // do the "general" audio  options. Note, these options are in the "general" stanza!
  94   parse_general_audio_options();
  95
  96   // get the specific settings
  97
  98   soundio = soundio_create();
  99   if (!soundio) {
 100     debug(0, "out of memory\n");
 101     return 1;
 102   }
 103   if ((err = soundio_connect_backend(soundio, SoundIoBackendCoreAudio))) {
 104     debug(0, "error connecting: %s", soundio_strerror(err));
 105     return 1;
 106   }
 107   soundio_flush_events(soundio);
 108
 109   int default_out_device_index = soundio_default_output_device_index(soundio);
 110   if (default_out_device_index < 0) {
 111     debug(0, "no output device found");
 112     return 1;
 113   }
 114
 115   device = soundio_get_output_device(soundio, default_out_device_index);
 116   if (!device) {
 117     debug(0, "out of memory");
 118     return 1;
 119   }
 120   debug(0, "Output device: %s\n", device->name);
 121   return 0;
 122 }
 123
 124 static void deinit(void) {
 125   soundio_ring_buffer_destroy(ring_buffer);
 126   soundio_device_unref(device);
 127   soundio_destroy(soundio);
 128   debug(0, "soundio audio deinit\n");
 129 }
 130
 131 static void start(int sample_rate, int sample_format) {
 132   Fs = sample_rate;
 133   starttime = 0;
 134   samples_played = 0;
 135   int err;
 136
 137   debug(1, "soundion rate: %d, format: %d", sample_rate, sample_format);
 138
 139   // soundio_device_sort_channel_layouts(device);
 140
 141   outstream = soundio_outstream_create(device);
 142   outstream->format = SoundIoFormatS16NE;
 143   outstream->sample_rate = sample_rate;
 144   outstream->layout.channel_count = 2;
 145   outstream->write_callback = write_callback;
 146   outstream->underflow_callback = underflow_callback;
 147   // outstream->software_latency = 0;
 148
 149   if ((err = soundio_outstream_open(outstream))) {
 150     debug(0, "unable to open device: %s", soundio_strerror(err));
 151   }
 152   if (outstream->layout_error)
 153     debug(0, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
 154
 155   int capacity = outstream->sample_rate * outstream->bytes_per_frame;
 156   ring_buffer = soundio_ring_buffer_create(soundio, capacity);
 157   if (!ring_buffer)
 158     debug(0, "unable to create ring buffer: out of memory");
 159   char *buf = soundio_ring_buffer_write_ptr(ring_buffer);
 160   memset(buf, 0, capacity);
 161   soundio_ring_buffer_advance_write_ptr(ring_buffer, capacity);
 162
 163   if ((err = soundio_outstream_start(outstream))) {
 164     debug(0, "unable to start outstream: %s", soundio_strerror(err));
 165   }
 166
 167   debug(1, "libsoundio output started\n");
 168 }
 169
 170 static void play(short buf[], int samples) {
 171   // int err;
 172   int free_bytes = soundio_ring_buffer_free_count(ring_buffer);
 173   int written_bytes = 0;
 174   int write_bytes = 0;
 175   int left_bytes = samples * outstream->bytes_per_frame;
 176   char *write_ptr = soundio_ring_buffer_write_ptr(ring_buffer);
 177
 178   debug(3, "[<<---] samples: %d , size: %d", samples, left_bytes);
 179   write_bytes = min_int(left_bytes, free_bytes);
 180   debug(3, "[<<---] left_bytes: %d, write_bytes: %d, free_bytes: %d\n", left_bytes, write_bytes,
 181         free_bytes);
 182
 183   if (write_bytes) {
 184     memcpy(write_ptr, (char *)buf, write_bytes);
 185     written_bytes += write_bytes;
 186     soundio_ring_buffer_advance_write_ptr(ring_buffer, write_bytes);
 187     debug(3, "[<<---] Written to buffer : %d\n", written_bytes);
 188   }
 189 }
 190
 191 static void parameters(audio_parameters *info) {
 192   info->minimum_volume_dB = -30.0;
 193   info->maximum_volume_dB = 0.0;
 194   debug(2, "Parameters\n");
 195   debug(2, "Current Volume dB: %f\n", info->current_volume_dB);
 196   debug(2, "Minimum Volume dB: %d\n", info->minimum_volume_dB);
 197   debug(2, "Maximum Volume dB: %d\n", info->maximum_volume_dB);
 198 }
 199
 200 static void stop(void) {
 201   soundio_outstream_destroy(outstream);
 202   soundio_ring_buffer_clear(ring_buffer);
 203   debug(1, "libsoundio output stopped\n");
 204 }
 205
 206 static void flush(void) {
 207   soundio_ring_buffer_clear(ring_buffer);
 208   debug(1, "libsoundio output flushed\n");
 209 }
 210
 211 static void help(void) { printf(" There are no options for libsoundio.\n"); }
 212
 213 audio_output audio_soundio = {.name = "soundio",
 214                               .help = &help,
 215                               .init = &init,
 216                               .deinit = &deinit,
 217                               .start = &start,
 218                               .stop = &stop,
 219                               .flush = &flush,
 220                               .delay = NULL,
 221                               .play = &play,
 222                               .volume = NULL,
 223                               .parameters = &parameters,
 224                               .mute = NULL};