796 lines
31 KiB
C
796 lines
31 KiB
C
/*
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* PulseAudio Backend. This file is part of Shairport Sync.
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* Copyright (c) Mike Brady 2017--2025
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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// Based (distantly, with thanks) on
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// http://stackoverflow.com/questions/29977651/how-can-the-pulseaudio-asynchronous-library-be-used-to-play-raw-pcm-data
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#include "audio.h"
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#include "common.h"
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#include <errno.h>
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#include <pthread.h>
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#include <pulse/pulseaudio.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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typedef struct {
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pa_sample_format_t pa_format;
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sps_format_t sps_format;
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unsigned int bytes_per_sample;
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} pa_sps_t;
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// these are the only formats that audio_pw will ever allow itself to be configured with
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static pa_sps_t format_lookup[] = {{PA_SAMPLE_S16LE, SPS_FORMAT_S16_LE, 2},
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{PA_SAMPLE_S16BE, SPS_FORMAT_S16_BE, 2},
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{PA_SAMPLE_S32LE, SPS_FORMAT_S32_LE, 4},
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{PA_SAMPLE_S32BE, SPS_FORMAT_S32_BE, 4}};
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#define CHANNEL_MAP_SIZE 1024
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static char channel_map[CHANNEL_MAP_SIZE + 1];
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static pthread_mutex_t buffer_mutex = PTHREAD_MUTEX_INITIALIZER;
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pa_threaded_mainloop *mainloop;
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pa_mainloop_api *mainloop_api;
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pa_context *context;
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pa_stream *stream;
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static int32_t current_encoded_output_format = 0;
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const char *default_channel_layouts = NULL;
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static char *audio_lmb, *audio_umb, *audio_toq, *audio_eoq;
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static size_t audio_size, audio_occupancy;
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// use an SPS_FORMAT_... to find an entry in the format_lookup table or return NULL
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static pa_sps_t *sps_format_lookup(sps_format_t to_find) {
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pa_sps_t *response = NULL;
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unsigned int i = 0;
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while ((response == NULL) && (i < sizeof(format_lookup) / sizeof(pa_sps_t))) {
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if (format_lookup[i].sps_format == to_find)
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response = &format_lookup[i];
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else
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i++;
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}
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return response;
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}
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void context_state_cb(pa_context *context, void *mainloop);
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void stream_state_cb(pa_stream *s, void *mainloop);
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void stream_success_cb(pa_stream *stream, int success, void *userdata);
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void stream_write_cb(pa_stream *stream, size_t requested_bytes, void *userdata);
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int status_error_notifications = 0;
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static void check_pa_stream_status(pa_stream *p, const char *message) {
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if (status_error_notifications < 10) {
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if (p == NULL) {
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warn("%s No pulseaudio stream!", message);
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status_error_notifications++;
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} else {
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status_error_notifications++; // assume an error
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switch (pa_stream_get_state(p)) {
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case PA_STREAM_UNCONNECTED:
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warn("%s Pulseaudio stream unconnected!", message);
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break;
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case PA_STREAM_CREATING:
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warn("%s Pulseaudio stream being created!", message);
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break;
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case PA_STREAM_READY:
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status_error_notifications--; // no error
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break;
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case PA_STREAM_FAILED:
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warn("%s Pulseaudio stream failed!", message);
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break;
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case PA_STREAM_TERMINATED:
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warn("%s Pulseaudio stream unexpectedly terminated!", message);
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break;
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default:
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warn("%s Pulseaudio stream in unexpected state %d!", message, pa_stream_get_state(p));
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break;
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}
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}
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}
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}
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static int check_settings(sps_format_t sample_format, unsigned int sample_rate,
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unsigned int channel_count) {
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// debug(1, "pa check_settings: configuration: %u/%s/%u.", sample_rate,
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// sps_format_description_string(sample_format), channel_count);
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int response = EINVAL;
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pa_sps_t *format_info = sps_format_lookup(sample_format);
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if (format_info != NULL) {
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// here, try to create a stream of the given format.
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pa_threaded_mainloop_lock(mainloop);
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// Create a playback stream
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pa_sample_spec sample_specifications;
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sample_specifications.format = format_info->pa_format;
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sample_specifications.rate = sample_rate;
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sample_specifications.channels = channel_count;
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pa_channel_map map;
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pa_channel_map_init_auto(&map, sample_specifications.channels, PA_CHANNEL_MAP_DEFAULT);
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pa_stream *check_settings_stream =
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pa_stream_new(context, "Playback", &sample_specifications, &map);
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if (check_settings_stream != NULL) {
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response = 0; // success
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pa_stream_unref(check_settings_stream);
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}
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pa_threaded_mainloop_unlock(mainloop);
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// response = 0;
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}
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// debug(1, "pa check_settings: configuration: %u/%s/%u %s.", sample_rate,
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// sps_format_description_string(sample_format), channel_count,
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// response == 0 ? "is okay" : "can not be configured");
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return response;
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}
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static int check_configuration(unsigned int channels, unsigned int rate, unsigned int format) {
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return check_settings(format, rate, channels);
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}
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static int32_t get_configuration(unsigned int channels, unsigned int rate, unsigned int format) {
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uint64_t start_time = get_absolute_time_in_ns();
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int32_t response =
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search_for_suitable_configuration(channels, rate, format, &check_configuration);
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int64_t elapsed_time = get_absolute_time_in_ns() - start_time;
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debug(3, "pa: get_configuration took %0.3f mS.", elapsed_time * 0.000001);
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return response;
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}
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static int configure(int32_t requested_encoded_format, char **resulting_channel_map) {
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debug(3, "pa: configure %s.", short_format_description(requested_encoded_format));
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int response = 0;
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if (current_encoded_output_format != requested_encoded_format) {
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uint64_t start_time = get_absolute_time_in_ns();
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if (current_encoded_output_format == 0)
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debug(3, "pa: setting output configuration to %s.",
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short_format_description(requested_encoded_format));
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else
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// note -- can't use short_format_description twice in one call because it returns the same
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// string buffer each time
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debug(3, "pa: changing output configuration to %s.",
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short_format_description(requested_encoded_format));
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current_encoded_output_format = requested_encoded_format;
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pa_sps_t *format_info =
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sps_format_lookup(FORMAT_FROM_ENCODED_FORMAT(current_encoded_output_format));
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if (format_info == NULL)
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die("pa: can't find format information!");
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if (audio_lmb != NULL) {
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free(audio_lmb); // release previous buffer
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}
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if (stream != NULL) {
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// debug(1, "pa: stopping and releasing the current stream...");
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pa_threaded_mainloop_lock(mainloop);
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if (pa_stream_is_corked(stream) == 0) {
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// debug(1,"Flush and cork for flush.");
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pa_stream_flush(stream, stream_success_cb, NULL);
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pa_stream_cork(stream, 1, stream_success_cb, mainloop);
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}
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pa_stream_disconnect(stream);
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pa_stream_unref(stream);
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pa_threaded_mainloop_unlock(mainloop);
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stream = NULL;
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}
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audio_size = RATE_FROM_ENCODED_FORMAT(current_encoded_output_format) *
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format_info->bytes_per_sample *
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CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format) * 1; // one seconds
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audio_lmb = malloc(audio_size);
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if (audio_lmb == NULL)
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die("Can't allocate %zd bytes for pulseaudio buffer.", audio_size);
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audio_toq = audio_eoq = audio_lmb;
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audio_umb = audio_lmb + audio_size;
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audio_occupancy = 0;
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pa_threaded_mainloop_lock(mainloop);
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// Create a playback stream
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pa_sample_spec sample_specifications;
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sample_specifications.format = format_info->pa_format;
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sample_specifications.rate = RATE_FROM_ENCODED_FORMAT(current_encoded_output_format);
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sample_specifications.channels = CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format);
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uint32_t buffer_size_in_bytes =
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(uint32_t)CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format) *
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format_info->bytes_per_sample * RATE_FROM_ENCODED_FORMAT(current_encoded_output_format) /
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10;
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pa_channel_map map;
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pa_channel_map *pacm = NULL;
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// if we've not asked specifically for native formats, ask for the alsa format...
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if ((default_channel_layouts == NULL) || (strcasecmp(default_channel_layouts, "alsa") == 0)) {
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pacm = pa_channel_map_init_auto(&map, sample_specifications.channels, PA_CHANNEL_MAP_ALSA);
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}
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// ask for the native format...
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if (pacm == NULL) {
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pacm = pa_channel_map_init_auto(&map, sample_specifications.channels, PA_CHANNEL_MAP_DEFAULT);
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}
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// ask for some format...
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if (pacm == NULL) {
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pacm =
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pa_channel_map_init_extend(&map, sample_specifications.channels, PA_CHANNEL_MAP_DEFAULT);
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}
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if (resulting_channel_map != NULL) { // if needed...
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// PA_CHANNEL_MAP_ALSA gives default channel maps that correspond to the FFmpeg defaults.
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// make up a channel map
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channel_map[0] = '\0';
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int c;
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for (c = 0; c < map.channels; c++) {
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switch (map.map[c]) {
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case PA_CHANNEL_POSITION_MONO:
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strncat(channel_map, "FC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_FRONT_LEFT:
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strncat(channel_map, "FL", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_FRONT_RIGHT:
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strncat(channel_map, "FR", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_FRONT_CENTER:
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strncat(channel_map, "FC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_REAR_CENTER:
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strncat(channel_map, "BC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_REAR_LEFT:
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strncat(channel_map, "BL", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_REAR_RIGHT:
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strncat(channel_map, "BR", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_LFE:
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strncat(channel_map, "LFE", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER:
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strncat(channel_map, "FLC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER:
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strncat(channel_map, "FRC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_SIDE_LEFT:
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strncat(channel_map, "SL", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_SIDE_RIGHT:
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strncat(channel_map, "SR", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX0:
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strncat(channel_map, "AUX0", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX1:
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strncat(channel_map, "AUX1", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX2:
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strncat(channel_map, "AUX2", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX3:
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strncat(channel_map, "AUX3", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX4:
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strncat(channel_map, "AUX4", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX5:
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strncat(channel_map, "AUX5", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX6:
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strncat(channel_map, "AUX6", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX7:
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strncat(channel_map, "AUX7", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX8:
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strncat(channel_map, "AUX8", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX9:
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strncat(channel_map, "AUX9", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX10:
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strncat(channel_map, "AUX10", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX11:
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strncat(channel_map, "AUX11", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX12:
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strncat(channel_map, "AUX12", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX13:
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strncat(channel_map, "AUX13", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX14:
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strncat(channel_map, "AUX14", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX15:
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strncat(channel_map, "AUX15", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX16:
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strncat(channel_map, "AUX16", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX17:
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strncat(channel_map, "AUX17", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX18:
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strncat(channel_map, "AUX18", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX19:
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strncat(channel_map, "AUX19", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX20:
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strncat(channel_map, "AUX20", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX21:
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strncat(channel_map, "AUX21", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX22:
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strncat(channel_map, "AUX22", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX23:
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strncat(channel_map, "AUX23", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX24:
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strncat(channel_map, "AUX24", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX25:
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strncat(channel_map, "AUX25", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX26:
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strncat(channel_map, "AUX26", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX27:
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strncat(channel_map, "AUX27", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX28:
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strncat(channel_map, "AUX28", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX29:
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strncat(channel_map, "AUX29", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX30:
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strncat(channel_map, "AUX30", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_AUX31:
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strncat(channel_map, "AUX31", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_CENTER:
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strncat(channel_map, "TC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_FRONT_LEFT:
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strncat(channel_map, "TFL", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_FRONT_RIGHT:
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strncat(channel_map, "TFR", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_FRONT_CENTER:
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strncat(channel_map, "TFC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_REAR_LEFT:
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strncat(channel_map, "TBL", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_REAR_RIGHT:
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strncat(channel_map, "TBR", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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case PA_CHANNEL_POSITION_TOP_REAR_CENTER:
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strncat(channel_map, "TBC", sizeof(channel_map) - 1 - strlen(channel_map));
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break;
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default:
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break;
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}
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if (c != (map.channels - 1))
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strncat(channel_map, " ", sizeof(channel_map) - 1 - strlen(channel_map));
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}
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debug(1, "audio_pa: channel map for %d channels is \"%s\".", sample_specifications.channels,
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channel_map);
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}
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stream = pa_stream_new(context, "Playback", &sample_specifications, &map);
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pa_stream_set_state_callback(stream, stream_state_cb, mainloop);
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pa_stream_set_write_callback(stream, stream_write_cb, mainloop);
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|
|
// recommended settings, i.e. server uses sensible values
|
|
pa_buffer_attr buffer_attr;
|
|
buffer_attr.maxlength = (uint32_t)-1;
|
|
buffer_attr.tlength = buffer_size_in_bytes;
|
|
buffer_attr.prebuf = (uint32_t)0;
|
|
buffer_attr.minreq = (uint32_t)-1;
|
|
|
|
pa_stream_flags_t stream_flags;
|
|
stream_flags = PA_STREAM_START_CORKED | PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_NOT_MONOTONIC |
|
|
PA_STREAM_AUTO_TIMING_UPDATE | PA_STREAM_ADJUST_LATENCY;
|
|
|
|
int connect_result;
|
|
|
|
if (config.pa_sink) {
|
|
// Connect stream to the sink specified in the config
|
|
connect_result = pa_stream_connect_playback(stream, config.pa_sink, &buffer_attr,
|
|
stream_flags, NULL, NULL);
|
|
} else {
|
|
// Connect stream to the default audio output sink
|
|
connect_result =
|
|
pa_stream_connect_playback(stream, NULL, &buffer_attr, stream_flags, NULL, NULL);
|
|
}
|
|
|
|
if (connect_result != 0)
|
|
die("could not connect to the pulseaudio playback stream -- the error message is \"%s\".",
|
|
pa_strerror(pa_context_errno(context)));
|
|
|
|
// Wait for the stream to be ready
|
|
for (;;) {
|
|
pa_stream_state_t stream_state = pa_stream_get_state(stream);
|
|
if (!PA_STREAM_IS_GOOD(stream_state))
|
|
die("stream state is no longer good while waiting for stream to become ready -- the error "
|
|
"message is \"%s\".",
|
|
pa_strerror(pa_context_errno(context)));
|
|
if (stream_state == PA_STREAM_READY)
|
|
break;
|
|
pa_threaded_mainloop_wait(mainloop);
|
|
}
|
|
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
|
|
// to here
|
|
|
|
int64_t elapsed_time = get_absolute_time_in_ns() - start_time;
|
|
debug(3, "pa: configuration took %0.3f mS.", elapsed_time * 0.000001);
|
|
} else {
|
|
debug(3, "pa: setting output configuration -- configuration unchanged, so nothing done.");
|
|
}
|
|
if ((response == 0) && (resulting_channel_map != NULL)) {
|
|
*resulting_channel_map = channel_map;
|
|
}
|
|
return response;
|
|
}
|
|
|
|
static int init(__attribute__((unused)) int argc, __attribute__((unused)) char **argv) {
|
|
// debug(1, "pa_init");
|
|
// set up default values first
|
|
config.audio_backend_buffer_desired_length = 0.35;
|
|
config.audio_backend_buffer_interpolation_threshold_in_seconds =
|
|
0.02; // below this, soxr interpolation will not occur -- it'll be basic interpolation
|
|
// instead.
|
|
|
|
config.audio_backend_latency_offset = 0;
|
|
|
|
// get settings from settings file, passing in defaults for format_set, rate_set and channel_set
|
|
// Note, these options may be in the "general" stanza or the named stanza
|
|
#ifdef CONFIG_FFMPEG
|
|
parse_audio_options("pulseaudio", SPS_FORMAT_SET, SPS_RATE_SET, SPS_CHANNEL_SET);
|
|
#else
|
|
parse_audio_options("pulseaudio", SPS_FORMAT_NON_FFMPEG_SET, SPS_RATE_NON_FFMPEG_SET,
|
|
SPS_CHANNNEL_NON_FFMPEG_SET);
|
|
#endif
|
|
|
|
// now the specific options
|
|
if (config.cfg != NULL) {
|
|
const char *str;
|
|
|
|
/* Get the PulseAudio server name. */
|
|
if (config_lookup_non_empty_string(config.cfg, "pulseaudio.server", &str)) {
|
|
config.pa_server = (char *)str;
|
|
}
|
|
|
|
// get the default channel mapping setting basis -- native ("no") or pa ("yes").
|
|
|
|
if (config_lookup_non_empty_string(config.cfg, "pulseaudio", &default_channel_layouts)) {
|
|
if ((strcasecmp(default_channel_layouts, "alsa") == 0) ||
|
|
(strcasecmp(default_channel_layouts, "pulseaudio") == 0)) {
|
|
debug(1, "pulseaudio default_channel_layouts setting: \"%s\".", default_channel_layouts);
|
|
} else {
|
|
debug(1, "Invalid pulseaudio default_channel_layouts setting. Must be \"alsa\" or "
|
|
"\"pulseaudio\".");
|
|
default_channel_layouts = NULL;
|
|
}
|
|
};
|
|
|
|
/* Get the Application Name. */
|
|
if (config_lookup_non_empty_string(config.cfg, "pulseaudio.application_name", &str)) {
|
|
config.pa_application_name = (char *)str;
|
|
}
|
|
|
|
/* Get the PulseAudio sink name. */
|
|
if (config_lookup_non_empty_string(config.cfg, "pulseaudio.sink", &str)) {
|
|
config.pa_sink = (char *)str;
|
|
}
|
|
}
|
|
|
|
// finish collecting settings
|
|
|
|
stream = NULL; // no stream
|
|
audio_lmb = NULL; // no buffer
|
|
|
|
// Get a mainloop and its context
|
|
|
|
mainloop = pa_threaded_mainloop_new();
|
|
if (mainloop == NULL)
|
|
die("could not create a pa_threaded_mainloop.");
|
|
mainloop_api = pa_threaded_mainloop_get_api(mainloop);
|
|
if (config.pa_application_name)
|
|
context = pa_context_new(mainloop_api, config.pa_application_name);
|
|
else
|
|
context = pa_context_new(mainloop_api, "Shairport Sync");
|
|
if (context == NULL)
|
|
die("could not create a new context for pulseaudio.");
|
|
// Set a callback so we can wait for the context to be ready
|
|
pa_context_set_state_callback(context, &context_state_cb, mainloop);
|
|
|
|
// Lock the mainloop so that it does not run and crash before the context is ready
|
|
pa_threaded_mainloop_lock(mainloop);
|
|
|
|
// Start the mainloop
|
|
if (pa_threaded_mainloop_start(mainloop) != 0)
|
|
die("could not start the pulseaudio threaded mainloop");
|
|
|
|
if (pa_context_connect(context, config.pa_server, 0, NULL) != 0)
|
|
die("failed to connect to the pulseaudio context -- the error message is \"%s\".",
|
|
pa_strerror(pa_context_errno(context)));
|
|
|
|
// Wait for the context to be ready
|
|
for (;;) {
|
|
pa_context_state_t context_state = pa_context_get_state(context);
|
|
if (!PA_CONTEXT_IS_GOOD(context_state))
|
|
die("pa context is not good -- the error message \"%s\".",
|
|
pa_strerror(pa_context_errno(context)));
|
|
if (context_state == PA_CONTEXT_READY)
|
|
break;
|
|
pa_threaded_mainloop_wait(mainloop);
|
|
}
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
return 0;
|
|
}
|
|
|
|
static void deinit(void) {
|
|
// debug(1, "pa deinit");
|
|
if (stream != NULL) {
|
|
check_pa_stream_status(stream, "audio_pa deinitialisation.");
|
|
pa_stream_disconnect(stream);
|
|
pa_threaded_mainloop_stop(mainloop);
|
|
pa_threaded_mainloop_free(mainloop);
|
|
debug(1, "pa deinit done");
|
|
}
|
|
}
|
|
|
|
/*
|
|
static void start(__attribute__((unused)) int sample_rate,
|
|
__attribute__((unused)) int sample_format) {
|
|
check_pa_stream_status(stream, "audio_pa start.");
|
|
}
|
|
*/
|
|
|
|
static int play(void *buf, int samples, __attribute__((unused)) int sample_type,
|
|
__attribute__((unused)) uint32_t timestamp,
|
|
__attribute__((unused)) uint64_t playtime) {
|
|
// debug(1,"pa_play of %d samples.",samples);
|
|
// copy the samples into the queue
|
|
check_pa_stream_status(stream, "audio_pa play.");
|
|
|
|
pa_sps_t *format_info =
|
|
sps_format_lookup(FORMAT_FROM_ENCODED_FORMAT(current_encoded_output_format));
|
|
size_t bytes_to_transfer = samples * format_info->bytes_per_sample *
|
|
CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format);
|
|
|
|
pthread_mutex_lock(&buffer_mutex);
|
|
size_t bytes_available = audio_size - audio_occupancy;
|
|
if (bytes_available < bytes_to_transfer)
|
|
bytes_to_transfer = bytes_available;
|
|
if ((bytes_to_transfer > 0) && (audio_lmb != NULL)) {
|
|
size_t space_to_end_of_buffer = audio_umb - audio_eoq;
|
|
if (space_to_end_of_buffer >= bytes_to_transfer) {
|
|
memcpy(audio_eoq, buf, bytes_to_transfer);
|
|
audio_eoq += bytes_to_transfer;
|
|
} else {
|
|
memcpy(audio_eoq, buf, space_to_end_of_buffer);
|
|
buf += space_to_end_of_buffer;
|
|
memcpy(audio_lmb, buf, bytes_to_transfer - space_to_end_of_buffer);
|
|
audio_eoq = audio_lmb + bytes_to_transfer - space_to_end_of_buffer;
|
|
}
|
|
audio_occupancy += bytes_to_transfer;
|
|
}
|
|
|
|
if ((audio_occupancy >=
|
|
(RATE_FROM_ENCODED_FORMAT(current_encoded_output_format) * format_info->bytes_per_sample *
|
|
CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format)) /
|
|
4) &&
|
|
(pa_stream_is_corked(stream))) {
|
|
// debug(1,"Uncorked");
|
|
pthread_mutex_unlock(&buffer_mutex);
|
|
pa_threaded_mainloop_lock(mainloop);
|
|
pa_stream_cork(stream, 0, stream_success_cb, mainloop);
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
} else {
|
|
pthread_mutex_unlock(&buffer_mutex);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int pa_delay(long *the_delay) {
|
|
// debug(1, "pa delay");
|
|
check_pa_stream_status(stream, "audio_pa delay.");
|
|
// debug(1,"pa_delay");
|
|
long result = 0;
|
|
int reply = 0;
|
|
pa_usec_t latency;
|
|
int negative;
|
|
pa_threaded_mainloop_lock(mainloop);
|
|
int gl = pa_stream_get_latency(stream, &latency, &negative);
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
if (gl == -PA_ERR_NODATA) {
|
|
reply = -ENODEV;
|
|
} else if (gl != 0) {
|
|
reply = -EIO;
|
|
} else {
|
|
pa_sps_t *format_info =
|
|
sps_format_lookup(FORMAT_FROM_ENCODED_FORMAT(current_encoded_output_format));
|
|
// convert audio_occupancy bytes to frames and latency microseconds into frames
|
|
result = (audio_occupancy / (format_info->bytes_per_sample *
|
|
CHANNELS_FROM_ENCODED_FORMAT(current_encoded_output_format))) +
|
|
(latency * RATE_FROM_ENCODED_FORMAT(current_encoded_output_format)) / 1000000;
|
|
reply = 0;
|
|
}
|
|
*the_delay = result;
|
|
return reply;
|
|
}
|
|
|
|
static void flush(void) {
|
|
// debug(1, "pa flush");
|
|
if (stream != NULL) {
|
|
check_pa_stream_status(stream, "audio_pa flush.");
|
|
pa_threaded_mainloop_lock(mainloop);
|
|
if (pa_stream_is_corked(stream) == 0) {
|
|
// debug(1,"Flush and cork for flush.");
|
|
pa_stream_flush(stream, stream_success_cb, NULL);
|
|
pa_stream_cork(stream, 1, stream_success_cb, mainloop);
|
|
}
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
}
|
|
pthread_mutex_lock(&buffer_mutex);
|
|
audio_toq = audio_eoq = audio_lmb;
|
|
audio_umb = audio_lmb + audio_size;
|
|
audio_occupancy = 0;
|
|
pthread_mutex_unlock(&buffer_mutex);
|
|
}
|
|
|
|
static void stop(void) {
|
|
// debug(1, "pa stop");
|
|
if (stream != NULL) {
|
|
check_pa_stream_status(stream, "audio_pa stop.");
|
|
// Cork the stream so it will stop playing
|
|
pa_threaded_mainloop_lock(mainloop);
|
|
if (pa_stream_is_corked(stream) == 0) {
|
|
// debug(1,"Flush and cork for stop.");
|
|
pa_stream_flush(stream, stream_success_cb, NULL);
|
|
pa_stream_cork(stream, 1, stream_success_cb, mainloop);
|
|
}
|
|
pa_threaded_mainloop_unlock(mainloop);
|
|
}
|
|
pthread_mutex_lock(&buffer_mutex);
|
|
audio_toq = audio_eoq = audio_lmb;
|
|
audio_umb = audio_lmb + audio_size;
|
|
audio_occupancy = 0;
|
|
pthread_mutex_unlock(&buffer_mutex);
|
|
}
|
|
|
|
void context_state_cb(__attribute__((unused)) pa_context *local_context, void *local_mainloop) {
|
|
// debug(1,"context_state_cb called.");
|
|
pa_threaded_mainloop_signal(local_mainloop, 0);
|
|
}
|
|
|
|
void stream_state_cb(__attribute__((unused)) pa_stream *s, void *local_mainloop) {
|
|
// debug(1,"stream_state_cb called.");
|
|
pa_threaded_mainloop_signal(local_mainloop, 0);
|
|
}
|
|
|
|
void stream_write_cb(pa_stream *local_stream, size_t requested_bytes,
|
|
__attribute__((unused)) void *userdata) {
|
|
// debug(1, "pa stream_write_cb");
|
|
check_pa_stream_status(local_stream, "audio_pa stream_write_cb.");
|
|
int bytes_to_transfer = requested_bytes;
|
|
int bytes_transferred = 0;
|
|
uint8_t *buffer = NULL;
|
|
int ret = 0;
|
|
pthread_mutex_lock(&buffer_mutex);
|
|
pthread_cleanup_push(mutex_unlock, (void *)&buffer_mutex);
|
|
while ((bytes_to_transfer > 0) && (audio_occupancy > 0) && (ret == 0)) {
|
|
if (pa_stream_is_suspended(local_stream))
|
|
debug(1, "local_stream is suspended");
|
|
size_t bytes_we_can_transfer = bytes_to_transfer;
|
|
if (audio_occupancy == 0) {
|
|
pa_stream_cork(local_stream, 1, stream_success_cb, mainloop);
|
|
debug(1, "stream_write_cb: corked");
|
|
}
|
|
if (audio_occupancy < bytes_we_can_transfer) {
|
|
// debug(1, "Underflow? We have %d bytes but we are asked for %d bytes", audio_occupancy,
|
|
// bytes_we_can_transfer);
|
|
bytes_we_can_transfer = audio_occupancy;
|
|
}
|
|
|
|
// bytes we can transfer will never be greater than the bytes available
|
|
|
|
ret = pa_stream_begin_write(local_stream, (void **)&buffer, &bytes_we_can_transfer);
|
|
if ((ret == 0) && (buffer != NULL) && (audio_lmb != NULL)) {
|
|
if (bytes_we_can_transfer <= (size_t)(audio_umb - audio_toq)) {
|
|
// the bytes are all in a row in the audo buffer
|
|
memcpy(buffer, audio_toq, bytes_we_can_transfer);
|
|
audio_toq += bytes_we_can_transfer;
|
|
ret = pa_stream_write(local_stream, buffer, bytes_we_can_transfer, NULL, 0LL,
|
|
PA_SEEK_RELATIVE);
|
|
} else {
|
|
// the bytes are in two places in the audio buffer
|
|
size_t first_portion_to_write = audio_umb - audio_toq;
|
|
if (first_portion_to_write != 0)
|
|
memcpy(buffer, audio_toq, first_portion_to_write);
|
|
uint8_t *new_buffer = buffer + first_portion_to_write;
|
|
memcpy(new_buffer, audio_lmb, bytes_we_can_transfer - first_portion_to_write);
|
|
ret = pa_stream_write(local_stream, buffer, bytes_we_can_transfer, NULL, 0LL,
|
|
PA_SEEK_RELATIVE);
|
|
audio_toq = audio_lmb + bytes_we_can_transfer - first_portion_to_write;
|
|
}
|
|
bytes_transferred += bytes_we_can_transfer;
|
|
audio_occupancy -= bytes_we_can_transfer;
|
|
bytes_to_transfer -= bytes_we_can_transfer;
|
|
}
|
|
}
|
|
pthread_cleanup_pop(1); // release the mutex
|
|
if (ret != 0)
|
|
debug(1, "error writing to pa buffer");
|
|
// debug(1,"<<<Frames requested %d, written to pa: %d, corked status:
|
|
// %d.",requested_bytes/4,bytes_transferred/4,pa_stream_is_corked(local_stream));
|
|
}
|
|
|
|
void stream_success_cb(__attribute__((unused)) pa_stream *local_stream,
|
|
__attribute__((unused)) int success,
|
|
__attribute__((unused)) void *userdata) {
|
|
return;
|
|
}
|
|
|
|
audio_output audio_pa = {.name = "pulseaudio",
|
|
.help = NULL,
|
|
.init = &init,
|
|
.deinit = &deinit,
|
|
.start = NULL,
|
|
.configure = &configure,
|
|
.get_configuration = &get_configuration,
|
|
.stop = &stop,
|
|
.is_running = NULL,
|
|
.flush = &flush,
|
|
.delay = &pa_delay,
|
|
.stats = NULL,
|
|
.play = &play,
|
|
.volume = NULL,
|
|
.parameters = NULL,
|
|
.mute = NULL};
|