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#include "audio.h"
#include "common.h"
#include <memory.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <soundio/soundio.h>
int Fs;
long long starttime, samples_played;
struct SoundIoOutStream *outstream;
struct SoundIo *soundio;
struct SoundIoDevice *device;
struct SoundIoRingBuffer *ring_buffer = NULL;
static int min_int(int a, int b) { return (a < b) ? a : b; }
static void write_callback(struct SoundIoOutStream *outstream, int frame_count_min,
int frame_count_max) {
struct SoundIoChannelArea *areas;
// int frame_count;
int err;
char *read_ptr = soundio_ring_buffer_read_ptr(ring_buffer);
int fill_bytes = soundio_ring_buffer_fill_count(ring_buffer);
int fill_count = fill_bytes / outstream->bytes_per_frame;
debug(3,
"[--->>] frame_count_min: %d , frame_count_max: %d , fill_bytes: %d , fill_count: %d , "
"outstream->bytes_per_frame: %d",
frame_count_min, frame_count_max, fill_bytes, fill_count, outstream->bytes_per_frame);
if (frame_count_min > fill_count) {
int frame_count = frame_count_min;
if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) {
debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
}
for (int frame = 0; frame < frame_count; frame += 1) {
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
memset(areas[ch].ptr, 0, outstream->bytes_per_sample);
areas[ch].ptr += areas[ch].step;
}
}
if ((err = soundio_outstream_end_write(outstream)))
debug(0, "[--->>] end write error: %s", soundio_strerror(err));
return;
}
int read_count = min_int(frame_count_max, fill_count);
int frames_left = read_count;
while (frames_left > 0) {
int frame_count = frames_left;
if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count)))
debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
if (frame_count <= 0)
break;
for (int frame = 0; frame < frame_count; frame += 1) {
for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
memcpy(areas[ch].ptr, read_ptr, outstream->bytes_per_sample);
areas[ch].ptr += areas[ch].step;
read_ptr += outstream->bytes_per_sample;
}
}
if ((err = soundio_outstream_end_write(outstream)))
debug(0, "[--->>] end write error: %s", soundio_strerror(err));
frames_left -= frame_count;
}
debug(3, "[--->>] Wrote: %d", read_count * outstream->bytes_per_frame);
soundio_ring_buffer_advance_read_ptr(ring_buffer, read_count * outstream->bytes_per_frame);
}
static void underflow_callback(__attribute__((unused)) struct SoundIoOutStream *outstream) {
static int count = 0;
debug(0, "underflow %d\n", ++count);
}
static int init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) {
int err;
config.audio_backend_buffer_desired_length = 2.0;
config.audio_backend_latency_offset = 0;
// get settings from settings file
// do the "general" audio options. Note, these options are in the "general" stanza!
parse_general_audio_options();
// get the specific settings
soundio = soundio_create();
if (!soundio) {
debug(0, "out of memory\n");
return 1;
}
if ((err = soundio_connect_backend(soundio, SoundIoBackendCoreAudio))) {
debug(0, "error connecting: %s", soundio_strerror(err));
return 1;
}
soundio_flush_events(soundio);
int default_out_device_index = soundio_default_output_device_index(soundio);
if (default_out_device_index < 0) {
debug(0, "no output device found");
return 1;
}
device = soundio_get_output_device(soundio, default_out_device_index);
if (!device) {
debug(0, "out of memory");
return 1;
}
debug(0, "Output device: %s\n", device->name);
return 0;
}
static void deinit(void) {
soundio_ring_buffer_destroy(ring_buffer);
soundio_device_unref(device);
soundio_destroy(soundio);
debug(0, "soundio audio deinit\n");
}
static void start(int sample_rate, int sample_format) {
Fs = sample_rate;
starttime = 0;
samples_played = 0;
int err;
debug(1, "soundion rate: %d, format: %d", sample_rate, sample_format);
// soundio_device_sort_channel_layouts(device);
outstream = soundio_outstream_create(device);
outstream->format = SoundIoFormatS16NE;
outstream->sample_rate = sample_rate;
outstream->layout.channel_count = 2;
outstream->write_callback = write_callback;
outstream->underflow_callback = underflow_callback;
// outstream->software_latency = 0;
if ((err = soundio_outstream_open(outstream))) {
debug(0, "unable to open device: %s", soundio_strerror(err));
}
if (outstream->layout_error)
debug(0, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
int capacity = outstream->sample_rate * outstream->bytes_per_frame;
ring_buffer = soundio_ring_buffer_create(soundio, capacity);
if (!ring_buffer)
debug(0, "unable to create ring buffer: out of memory");
char *buf = soundio_ring_buffer_write_ptr(ring_buffer);
memset(buf, 0, capacity);
soundio_ring_buffer_advance_write_ptr(ring_buffer, capacity);
if ((err = soundio_outstream_start(outstream))) {
debug(0, "unable to start outstream: %s", soundio_strerror(err));
}
debug(1, "libsoundio output started\n");
}
static int play(void *buf, int samples) {
// int err;
int free_bytes = soundio_ring_buffer_free_count(ring_buffer);
int written_bytes = 0;
int write_bytes = 0;
int left_bytes = samples * outstream->bytes_per_frame;
char *write_ptr = soundio_ring_buffer_write_ptr(ring_buffer);
debug(3, "[<<---] samples: %d , size: %d", samples, left_bytes);
write_bytes = min_int(left_bytes, free_bytes);
debug(3, "[<<---] left_bytes: %d, write_bytes: %d, free_bytes: %d\n", left_bytes, write_bytes,
free_bytes);
if (write_bytes) {
memcpy(write_ptr, buf, write_bytes);
written_bytes += write_bytes;
soundio_ring_buffer_advance_write_ptr(ring_buffer, write_bytes);
debug(3, "[<<---] Written to buffer : %d\n", written_bytes);
}
return 0;
}
static void parameters(audio_parameters *info) {
info->minimum_volume_dB = -30.0;
info->maximum_volume_dB = 0.0;
debug(2, "Parameters\n");
debug(2, "Current Volume dB: %f\n", info->current_volume_dB);
debug(2, "Minimum Volume dB: %d\n", info->minimum_volume_dB);
debug(2, "Maximum Volume dB: %d\n", info->maximum_volume_dB);
}
static void stop(void) {
soundio_outstream_destroy(outstream);
soundio_ring_buffer_clear(ring_buffer);
debug(1, "libsoundio output stopped\n");
}
static void flush(void) {
soundio_ring_buffer_clear(ring_buffer);
debug(1, "libsoundio output flushed\n");
}
static void help(void) { printf(" There are no options for libsoundio.\n"); }
audio_output audio_soundio = {.name = "soundio",
.help = &help,
.init = &init,
.deinit = &deinit,
.prepare = NULL,
.start = &start,
.stop = &stop,
.is_running = NULL,
.flush = &flush,
.delay = NULL,
.play = &play,
.volume = NULL,
.parameters = ¶meters,
.mute = NULL};
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