226 lines
7.4 KiB
C
226 lines
7.4 KiB
C
#include "audio.h"
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#include "common.h"
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#include <memory.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <soundio/soundio.h>
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struct SoundIoOutStream *outstream;
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struct SoundIo *soundio;
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struct SoundIoDevice *device;
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struct SoundIoRingBuffer *ring_buffer = NULL;
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static int min_int(int a, int b) { return (a < b) ? a : b; }
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static void write_callback(struct SoundIoOutStream *outstream, int frame_count_min,
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int frame_count_max) {
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struct SoundIoChannelArea *areas;
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// int frame_count;
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int err;
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char *read_ptr = soundio_ring_buffer_read_ptr(ring_buffer);
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int fill_bytes = soundio_ring_buffer_fill_count(ring_buffer);
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if (outstream->bytes_per_frame == 0)
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die("soundio: outstream->bytes_per_frame is zero.");
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int fill_count = fill_bytes / outstream->bytes_per_frame;
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debug(3,
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"[--->>] frame_count_min: %d , frame_count_max: %d , fill_bytes: %d , fill_count: %d , "
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"outstream->bytes_per_frame: %d",
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frame_count_min, frame_count_max, fill_bytes, fill_count, outstream->bytes_per_frame);
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if (frame_count_min > fill_count) {
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int frame_count = frame_count_min;
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if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count))) {
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debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
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}
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for (int frame = 0; frame < frame_count; frame += 1) {
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for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
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memset(areas[ch].ptr, 0, outstream->bytes_per_sample);
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areas[ch].ptr += areas[ch].step;
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}
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}
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if ((err = soundio_outstream_end_write(outstream)))
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debug(0, "[--->>] end write error: %s", soundio_strerror(err));
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return;
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}
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int read_count = min_int(frame_count_max, fill_count);
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int frames_left = read_count;
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while (frames_left > 0) {
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int frame_count = frames_left;
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if ((err = soundio_outstream_begin_write(outstream, &areas, &frame_count)))
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debug(0, "[--->>] begin write error: %s", soundio_strerror(err));
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if (frame_count <= 0)
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break;
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for (int frame = 0; frame < frame_count; frame += 1) {
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for (int ch = 0; ch < outstream->layout.channel_count; ch += 1) {
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memcpy(areas[ch].ptr, read_ptr, outstream->bytes_per_sample);
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areas[ch].ptr += areas[ch].step;
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read_ptr += outstream->bytes_per_sample;
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}
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}
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if ((err = soundio_outstream_end_write(outstream)))
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debug(0, "[--->>] end write error: %s", soundio_strerror(err));
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frames_left -= frame_count;
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}
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debug(3, "[--->>] Wrote: %d", read_count * outstream->bytes_per_frame);
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soundio_ring_buffer_advance_read_ptr(ring_buffer, read_count * outstream->bytes_per_frame);
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}
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static void underflow_callback(__attribute__((unused)) struct SoundIoOutStream *outstream) {
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static int count = 0;
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debug(0, "underflow %d\n", ++count);
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}
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static int init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) {
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int err;
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config.audio_backend_buffer_desired_length = 2.0;
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config.audio_backend_latency_offset = 0;
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// get settings from settings file
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// do the "general" audio options. Note, these options are in the "general" stanza!
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parse_general_audio_options();
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// get the specific settings
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soundio = soundio_create();
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if (!soundio) {
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debug(0, "out of memory\n");
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return 1;
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}
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if ((err = soundio_connect_backend(soundio, SoundIoBackendCoreAudio))) {
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debug(0, "error connecting: %s", soundio_strerror(err));
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return 1;
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}
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soundio_flush_events(soundio);
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int default_out_device_index = soundio_default_output_device_index(soundio);
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if (default_out_device_index < 0) {
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debug(0, "no output device found");
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return 1;
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}
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device = soundio_get_output_device(soundio, default_out_device_index);
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if (!device) {
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debug(0, "out of memory");
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return 1;
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}
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debug(0, "Output device: %s\n", device->name);
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return 0;
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}
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static void deinit(void) {
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soundio_ring_buffer_destroy(ring_buffer);
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soundio_device_unref(device);
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soundio_destroy(soundio);
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debug(0, "soundio audio deinit\n");
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}
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static void start(int sample_rate, int sample_format) {
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int err;
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debug(1, "soundion rate: %d, format: %d", sample_rate, sample_format);
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// soundio_device_sort_channel_layouts(device);
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outstream = soundio_outstream_create(device);
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outstream->format = SoundIoFormatS16NE;
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outstream->sample_rate = sample_rate;
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outstream->layout.channel_count = 2;
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outstream->write_callback = write_callback;
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outstream->underflow_callback = underflow_callback;
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// outstream->software_latency = 0;
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if ((err = soundio_outstream_open(outstream))) {
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debug(0, "unable to open device: %s", soundio_strerror(err));
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}
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if (outstream->layout_error)
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debug(0, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
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int capacity = outstream->sample_rate * outstream->bytes_per_frame;
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ring_buffer = soundio_ring_buffer_create(soundio, capacity);
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if (!ring_buffer)
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debug(0, "unable to create ring buffer: out of memory");
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char *buf = soundio_ring_buffer_write_ptr(ring_buffer);
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memset(buf, 0, capacity);
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soundio_ring_buffer_advance_write_ptr(ring_buffer, capacity);
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if ((err = soundio_outstream_start(outstream))) {
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debug(0, "unable to start outstream: %s", soundio_strerror(err));
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}
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debug(1, "libsoundio output started\n");
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}
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static int play(void *buf, int samples, __attribute__((unused)) int sample_type,
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__attribute__((unused)) uint32_t timestamp,
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__attribute__((unused)) uint64_t playtime) {
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// int err;
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int free_bytes = soundio_ring_buffer_free_count(ring_buffer);
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int written_bytes = 0;
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int write_bytes = 0;
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int left_bytes = samples * outstream->bytes_per_frame;
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char *write_ptr = soundio_ring_buffer_write_ptr(ring_buffer);
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debug(3, "[<<---] samples: %d , size: %d", samples, left_bytes);
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write_bytes = min_int(left_bytes, free_bytes);
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debug(3, "[<<---] left_bytes: %d, write_bytes: %d, free_bytes: %d\n", left_bytes, write_bytes,
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free_bytes);
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if (write_bytes) {
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memcpy(write_ptr, buf, write_bytes);
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written_bytes += write_bytes;
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soundio_ring_buffer_advance_write_ptr(ring_buffer, write_bytes);
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debug(3, "[<<---] Written to buffer : %d\n", written_bytes);
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}
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return 0;
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}
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static void parameters(audio_parameters *info) {
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info->minimum_volume_dB = -30.0;
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info->maximum_volume_dB = 0.0;
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debug(2, "Parameters\n");
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debug(2, "Current Volume dB: %f\n", info->current_volume_dB);
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debug(2, "Minimum Volume dB: %d\n", info->minimum_volume_dB);
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debug(2, "Maximum Volume dB: %d\n", info->maximum_volume_dB);
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}
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static void stop(void) {
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soundio_outstream_destroy(outstream);
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soundio_ring_buffer_clear(ring_buffer);
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debug(1, "libsoundio output stopped\n");
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}
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static void flush(void) {
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soundio_ring_buffer_clear(ring_buffer);
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debug(1, "libsoundio output flushed\n");
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}
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audio_output audio_soundio = {.name = "soundio",
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.help = NULL,
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.init = &init,
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.deinit = &deinit,
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.prepare = NULL,
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.start = &start,
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.stop = &stop,
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.is_running = NULL,
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.flush = &flush,
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.delay = NULL,
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.stats = NULL,
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.play = &play,
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.volume = NULL,
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.parameters = ¶meters,
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.mute = NULL};
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