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#include "pulseout.h"
#include <stdbool.h>
#include <stdlib.h>
#include <pulse/thread-mainloop.h>
#include <pulse/stream.h>
struct pulseout_state {
struct sound_state ss;
bool paused;
bool flush;
unsigned srate;
sound_callback cbfunc;
void *userptr;
pa_threaded_mainloop *pa_tm;
pa_context *pa_c;
pa_stream *pa_s;
bool pa_status_changed;
};
static void pulseout_pause(struct sound_state *ss, int pause, int flush) {
//return;
struct pulseout_state *ps = (struct pulseout_state *)ss;
if (ps->paused != !!pause) {
if (pause) {
pa_threaded_mainloop_lock(ps->pa_tm);
}
ps->paused = pause;
if (!pause) {
if (flush) ps->flush = true;
pa_threaded_mainloop_unlock(ps->pa_tm);
}
}
}
static void pulseout_free(struct sound_state *ss) {
struct pulseout_state *ps = (struct pulseout_state *)ss;
if (ps) {
if (ps->pa_tm) {
if (ps->paused) pa_threaded_mainloop_unlock(ps->pa_tm);
pa_threaded_mainloop_stop(ps->pa_tm);
if (ps->pa_s) {
pa_stream_disconnect(ps->pa_s);
pa_stream_unref(ps->pa_s);
}
if (ps->pa_c) pa_context_unref(ps->pa_c);
pa_threaded_mainloop_free(ps->pa_tm);
}
free(ps);
}
}
static void pulseout_cb(pa_stream *p, size_t bytes, void *userdata) {
struct pulseout_state *ps = userdata;
int16_t *buf;
pa_stream_begin_write(p, (void **)&buf, &bytes);
size_t nframes = bytes / (2 * sizeof(int16_t));
if (!ps->paused) {
ps->cbfunc(ps->userptr, buf, nframes);
} else {
for (size_t i = 0; i < nframes; i++) {
buf[i*2+0] = 0;
buf[i*2+1] = 0;
}
}
pa_seek_mode_t smode =
ps->flush ? PA_SEEK_RELATIVE_ON_READ : PA_SEEK_RELATIVE;
pa_stream_write(p, buf, nframes * 2 * sizeof(int16_t), 0, 0, smode);
ps->flush = false;
}
static void pa_c_cb(pa_context *pa_c, void *userdata) {
struct pulseout_state *ps = userdata;
ps->pa_status_changed = true;
pa_threaded_mainloop_signal(ps->pa_tm, 0);
}
struct sound_state *pulseout_init(
const char *clientname, unsigned srate,
sound_callback cbfunc, void *userptr) {
struct pulseout_state *ps = malloc(sizeof(*ps));
if (!ps) goto err;
*ps = (struct pulseout_state){
.ss = {
.pause = pulseout_pause,
.free = pulseout_free,
.apiname = "PulseAudio",
},
.cbfunc = cbfunc,
.userptr = userptr,
.paused = false,
.srate = srate,
};
ps->pa_tm = pa_threaded_mainloop_new();
if (!ps->pa_tm) goto err;
ps->pa_c = pa_context_new(
pa_threaded_mainloop_get_api(ps->pa_tm), clientname
);
if (!ps->pa_c) goto err;
if (pa_context_connect(ps->pa_c, 0, 0, 0) < 0) goto err;
pa_context_set_state_callback(ps->pa_c, pa_c_cb, ps);
if (pa_threaded_mainloop_start(ps->pa_tm) < 0) goto err;
pa_threaded_mainloop_lock(ps->pa_tm);
ps->paused = true;
for (;;) {
while (!ps->pa_status_changed) {
pa_threaded_mainloop_wait(ps->pa_tm);
}
ps->pa_status_changed = false;
pa_context_state_t state = pa_context_get_state(ps->pa_c);
if (state == PA_CONTEXT_CONNECTING ||
state == PA_CONTEXT_AUTHORIZING ||
state == PA_CONTEXT_SETTING_NAME) continue;
else if (state == PA_CONTEXT_READY) break;
else goto err;
}
pa_sample_spec ss = {
.format = PA_SAMPLE_S16NE,
.rate = ps->srate,
.channels = 2,
};
ps->pa_s = pa_stream_new(
ps->pa_c,
"stereoout", &ss, 0
);
if (!ps->pa_s) goto err;
pa_stream_set_write_callback(ps->pa_s, pulseout_cb, ps);
if (pa_stream_connect_playback(ps->pa_s, 0, 0, 0, 0, 0) < 0) goto err;
return &ps->ss;
err:
pulseout_free(&ps->ss);
return 0;
}
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