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 struct SoundIoOutStream *outstream;
  11 struct SoundIo *soundio;
  12 struct SoundIoDevice *device;
  13 struct SoundIoRingBuffer *ring_buffer = NULL;
  14
  15 static int min_int(int a, int b) { return (a < b) ? a : b; }
  16
  17 static void write_callback(struct SoundIoOutStream *outstream, int frame_count_min,
  18                            int frame_count_max) {
  19   struct SoundIoChannelArea *areas;
  20   // int frame_count;
  21   int err;
  22
  23   char *read_ptr = soundio_ring_buffer_read_ptr(ring_buffer);
  24   int fill_bytes = soundio_ring_buffer_fill_count(ring_buffer);
  25   if (outstream->bytes_per_frame == 0)
  26     die("soundio: outstream->bytes_per_frame is zero.");
  27   int fill_count = fill_bytes / outstream->bytes_per_frame;
  28
  29   debug(3,
  30         "[--->>] 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   int err;
 133
 134   debug(1, "soundion rate: %d, format: %d", sample_rate, sample_format);
 135
 136   // soundio_device_sort_channel_layouts(device);
 137
 138   outstream = soundio_outstream_create(device);
 139   outstream->format = SoundIoFormatS16NE;
 140   outstream->sample_rate = sample_rate;
 141   outstream->layout.channel_count = 2;
 142   outstream->write_callback = write_callback;
 143   outstream->underflow_callback = underflow_callback;
 144   // outstream->software_latency = 0;
 145
 146   if ((err = soundio_outstream_open(outstream))) {
 147     debug(0, "unable to open device: %s", soundio_strerror(err));
 148   }
 149   if (outstream->layout_error)
 150     debug(0, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
 151
 152   int capacity = outstream->sample_rate * outstream->bytes_per_frame;
 153   ring_buffer = soundio_ring_buffer_create(soundio, capacity);
 154   if (!ring_buffer)
 155     debug(0, "unable to create ring buffer: out of memory");
 156   char *buf = soundio_ring_buffer_write_ptr(ring_buffer);
 157   memset(buf, 0, capacity);
 158   soundio_ring_buffer_advance_write_ptr(ring_buffer, capacity);
 159
 160   if ((err = soundio_outstream_start(outstream))) {
 161     debug(0, "unable to start outstream: %s", soundio_strerror(err));
 162   }
 163
 164   debug(1, "libsoundio output started\n");
 165 }
 166
 167 static int play(void *buf, int samples) {
 168   // int err;
 169   int free_bytes = soundio_ring_buffer_free_count(ring_buffer);
 170   int written_bytes = 0;
 171   int write_bytes = 0;
 172   int left_bytes = samples * outstream->bytes_per_frame;
 173   char *write_ptr = soundio_ring_buffer_write_ptr(ring_buffer);
 174
 175   debug(3, "[<<---] samples: %d , size: %d", samples, left_bytes);
 176   write_bytes = min_int(left_bytes, free_bytes);
 177   debug(3, "[<<---] left_bytes: %d, write_bytes: %d, free_bytes: %d\n", left_bytes, write_bytes,
 178         free_bytes);
 179
 180   if (write_bytes) {
 181     memcpy(write_ptr, buf, write_bytes);
 182     written_bytes += write_bytes;
 183     soundio_ring_buffer_advance_write_ptr(ring_buffer, write_bytes);
 184     debug(3, "[<<---] Written to buffer : %d\n", written_bytes);
 185   }
 186   return 0;
 187 }
 188
 189 static void parameters(audio_parameters *info) {
 190   info->minimum_volume_dB = -30.0;
 191   info->maximum_volume_dB = 0.0;
 192   debug(2, "Parameters\n");
 193   debug(2, "Current Volume dB: %f\n", info->current_volume_dB);
 194   debug(2, "Minimum Volume dB: %d\n", info->minimum_volume_dB);
 195   debug(2, "Maximum Volume dB: %d\n", info->maximum_volume_dB);
 196 }
 197
 198 static void stop(void) {
 199   soundio_outstream_destroy(outstream);
 200   soundio_ring_buffer_clear(ring_buffer);
 201   debug(1, "libsoundio output stopped\n");
 202 }
 203
 204 static void flush(void) {
 205   soundio_ring_buffer_clear(ring_buffer);
 206   debug(1, "libsoundio output flushed\n");
 207 }
 208
 209 static void help(void) { printf(" There are no options for libsoundio.\n"); }
 210
 211 audio_output audio_soundio = {.name = "soundio",
 212                               .help = &help,
 213                               .init = &init,
 214                               .deinit = &deinit,
 215                               .prepare = NULL,
 216                               .start = &start,
 217                               .stop = &stop,
 218                               .is_running = NULL,
 219                               .flush = &flush,
 220                               .delay = NULL,
 221                               .stats = NULL,
 222                               .play = &play,
 223                               .volume = NULL,
 224                               .parameters = &parameters,
 225                               .mute = NULL};