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pulse.cpp
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pulse.cpp
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/*
* pulse.cpp
* PulseAudio output routines
*
* Copyright (c) 2015-2020 Tomasz Lemiech <[email protected]>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http:https://www.gnu.org/licenses/>.
*/
#include <iostream>
#include <syslog.h>
#include <pulse/pulseaudio.h>
#include "rtl_airband.h"
#define SERVER_IFNOTNULL(x) ((x) ? (x) : "<default_server>")
#define PA_LOOP_LOCK(x) if(!pa_threaded_mainloop_in_thread(x)) { pa_threaded_mainloop_lock(x); }
#define PA_LOOP_UNLOCK(x) if(!pa_threaded_mainloop_in_thread(x)) { pa_threaded_mainloop_unlock(x); }
using namespace std;
pa_threaded_mainloop *mainloop = NULL;
void pulse_shutdown(pulse_data *pdata) {
if(!pdata)
return;
PA_LOOP_LOCK(mainloop);
if(pdata->left) {
pa_stream_disconnect(pdata->left);
pa_stream_unref(pdata->left);
pdata->left = NULL;
}
if(pdata->right) {
pa_stream_disconnect(pdata->right);
pa_stream_unref(pdata->right);
pdata->right = NULL;
}
if(pdata->context) {
pa_context_disconnect(pdata->context);
pa_context_unref(pdata->context);
pdata->context = NULL;
}
PA_LOOP_UNLOCK(mainloop);
}
static void pulse_stream_underflow_cb(pa_stream *stream, void *userdata) {
pulse_data *pdata = (pulse_data *)userdata;
if(pdata->continuous) // do not flood the logs on every squelch closing
log(LOG_INFO, "pulse: %s: stream \"%s\": underflow\n", SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
}
static void pulse_stream_overflow_cb(pa_stream *stream, void *userdata) {
pulse_data *pdata = (pulse_data *)userdata;
log(LOG_INFO, "pulse: %s: stream \"%s\": overflow\n", SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
}
static void stream_state_cb(pa_stream *stream, void *userdata) {
pulse_data *pdata = (pulse_data *)userdata;
switch (pa_stream_get_state(stream)) {
case PA_STREAM_READY:
if(pdata->mode == MM_MONO ||
(pa_stream_get_state(pdata->left) == PA_STREAM_READY &&
pa_stream_get_state(pdata->right) == PA_STREAM_READY))
pa_stream_cork(pdata->left, 0, NULL, NULL);
break;
case PA_STREAM_UNCONNECTED:
case PA_STREAM_CREATING:
break;
case PA_STREAM_FAILED:
log(LOG_WARNING, "pulse: %s: stream \"%s\" failed: %s\n", SERVER_IFNOTNULL(pdata->server), pdata->stream_name,
pa_strerror(pa_context_errno(pdata->context)));
break;
case PA_STREAM_TERMINATED:
log(LOG_WARNING, "pulse: %s: stream \"%s\" terminated\n", SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
break;
break;
}
}
static pa_stream *pulse_setup_stream(pulse_data *pdata, const pa_sample_spec *ss, pa_channel_map *cmap, pa_stream *sync_stream) {
pa_stream *stream = NULL;
PA_LOOP_LOCK(mainloop);
if(!(stream = pa_stream_new(pdata->context, pdata->stream_name, ss, cmap))) {
log(LOG_ERR, "pulse: %s: failed to create stream \"%s\": %s\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name, pa_strerror(pa_context_errno(pdata->context)));
goto fail;
}
pa_stream_set_state_callback(stream, stream_state_cb, pdata);
pa_stream_set_underflow_callback(stream, pulse_stream_underflow_cb, pdata);
pa_stream_set_overflow_callback(stream, pulse_stream_overflow_cb, pdata);
// Initially streams are corked (paused). For mono streams this is irrelevant,
// but for stereo mixers it's required to keep left and right channels in sync.
// Starting the left channel stream before the other stream from the sync pair is
// set up causes the left channel stream to fail.
if(pa_stream_connect_playback(stream, pdata->sink, NULL,
(pa_stream_flags_t)(PA_STREAM_INTERPOLATE_TIMING
|PA_STREAM_ADJUST_LATENCY
|PA_STREAM_START_CORKED
|PA_STREAM_AUTO_TIMING_UPDATE), NULL, sync_stream) < 0) {
log(LOG_ERR, "pulse: %s: failed to connect stream \"%s\": %s\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name, pa_strerror(pa_context_errno(pdata->context)));
goto fail;
}
log(LOG_INFO, "pulse: %s: stream \"%s\" connected\n", SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
PA_LOOP_UNLOCK(mainloop);
return stream;
fail:
PA_LOOP_UNLOCK(mainloop);
return NULL;
}
static void pulse_setup_streams(pulse_data *pdata) {
const pa_sample_spec ss = {
#if __cplusplus >= 199711L
.format = PA_SAMPLE_FLOAT32LE,
.rate = WAVE_RATE,
.channels = 1
#else // for g++ 4.6 (eg. Raspbian Wheezy)
PA_SAMPLE_FLOAT32LE, WAVE_RATE, 1
#endif
};
pa_channel_map_init_mono(&pdata->lmap);
pdata->lmap.map[0] = (pdata->mode == MM_STEREO ? PA_CHANNEL_POSITION_LEFT : PA_CHANNEL_POSITION_MONO);
if(!(pdata->left = pulse_setup_stream(pdata, &ss, &pdata->lmap, NULL)))
goto fail;
if(pdata->mode == MM_STEREO) {
pa_channel_map_init_mono(&pdata->rmap);
pdata->rmap.map[0] = PA_CHANNEL_POSITION_RIGHT;
if(!(pdata->right = pulse_setup_stream(pdata, &ss, &pdata->rmap, pdata->left)))
goto fail;
}
return;
fail:
pulse_shutdown(pdata);
}
static void pulse_ctx_state_cb(pa_context *c, void *userdata) {
pulse_data *pdata = (pulse_data *)userdata;
switch (pa_context_get_state(c)) {
case PA_CONTEXT_READY:
pulse_setup_streams(pdata);
break;
case PA_CONTEXT_TERMINATED:
break;
case PA_CONTEXT_FAILED:
log(LOG_ERR, "pulse: %s: connection failed: %s\n", SERVER_IFNOTNULL(pdata->server),
pa_strerror(pa_context_errno(pdata->context)));
pulse_shutdown(pdata);
break;
case PA_CONTEXT_CONNECTING:
log(LOG_INFO, "pulse: %s: connecting...\n", SERVER_IFNOTNULL(pdata->server));
break;
case PA_CONTEXT_UNCONNECTED:
case PA_CONTEXT_AUTHORIZING:
case PA_CONTEXT_SETTING_NAME:
break;
}
}
void pulse_init() {
if(!mainloop && !(mainloop = pa_threaded_mainloop_new())) {
cerr<<"Failed to initialize PulseAudio main loop - aborting\n";
error();
}
}
int pulse_setup(pulse_data *pdata, mix_modes mixmode) {
if(!(pdata->context = pa_context_new(pa_threaded_mainloop_get_api(mainloop), pdata->name))) {
log(LOG_ERR, "%s", "pulse: failed to create context\n");
return -1;
}
pdata->mode = mixmode;
PA_LOOP_LOCK(mainloop);
int ret = 0;
pa_context_set_state_callback(pdata->context, &pulse_ctx_state_cb, pdata);
if(pa_context_connect(pdata->context, pdata->server, PA_CONTEXT_NOFLAGS, NULL) < 0) {
log(LOG_WARNING, "pulse: %s: failed to connect: %s\n", SERVER_IFNOTNULL(pdata->server),
pa_strerror(pa_context_errno(pdata->context)));
// Don't clean up things here, context state is now set to PA_CONTEXT_FAILED,
// so pulse_ctx_state_cb will take care of that.
ret = -1;
}
PA_LOOP_UNLOCK(mainloop);
return ret;
}
void pulse_start() {
if(!mainloop) return;
PA_LOOP_LOCK(mainloop);
pa_threaded_mainloop_start(mainloop);
PA_LOOP_UNLOCK(mainloop);
}
static int pulse_write_single_stream(pa_stream *stream, pulse_data *pdata, float *data, size_t len, bool is_master) {
pa_usec_t latency;
int ret = -1;
int lret;
PA_LOOP_LOCK(mainloop);
if(!stream || pa_stream_get_state(stream) != PA_STREAM_READY)
goto end;
if(is_master) { /* latency info is only meaningful for master stream) */
lret = pa_stream_get_latency(stream, &latency, NULL);
if(lret < 0) {
log(LOG_WARNING, "pulse: %s: failed to get latency info for stream \"%s\" (error is: %s), disconnecting\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name, pa_strerror(lret));
goto end;
}
if(latency > PULSE_STREAM_LATENCY_LIMIT) {
log(LOG_INFO, "pulse: %s: exceeded max backlog for stream \"%s\", disconnecting\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
goto end;
}
debug_bulk_print("pulse: %s: stream=\"%s\" lret=%d latency=%f ms\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name, lret, (float)latency / 1000.0f);
}
if(pa_stream_write(stream, data, len, NULL, 0LL, PA_SEEK_RELATIVE) < 0) {
log(LOG_WARNING, "pulse: %s: could not write to stream \"%s\", disconnecting\n",
SERVER_IFNOTNULL(pdata->server), pdata->stream_name);
goto end;
}
ret = 0;
end:
PA_LOOP_UNLOCK(mainloop);
return ret;
}
void pulse_write_stream(pulse_data *pdata, mix_modes mode, float *data_left, float *data_right, size_t len) {
PA_LOOP_LOCK(mainloop);
if(!pdata->context || pa_context_get_state(pdata->context) != PA_CONTEXT_READY)
goto end;
if(pulse_write_single_stream(pdata->left, pdata, data_left, len, true) < 0)
goto fail;
if(mode == MM_STEREO && pulse_write_single_stream(pdata->right, pdata, data_right, len, false) < 0)
goto fail;
goto end;
fail:
pulse_shutdown(pdata);
end:
PA_LOOP_UNLOCK(mainloop);
return;
}