PulseAudio  16.0

A simple playback tool using the simple API

This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <pulse/simple.h>
#include <pulse/error.h>
#define BUFSIZE 1024
int main(int argc, char*argv[]) {
/* The Sample format to use */
static const pa_sample_spec ss = {
.rate = 44100,
.channels = 2
pa_simple *s = NULL;
int ret = 1;
int error;
/* replace STDIN with the specified file if needed */
if (argc > 1) {
int fd;
if ((fd = open(argv[1], O_RDONLY)) < 0) {
fprintf(stderr, __FILE__": open() failed: %s\n", strerror(errno));
goto finish;
if (dup2(fd, STDIN_FILENO) < 0) {
fprintf(stderr, __FILE__": dup2() failed: %s\n", strerror(errno));
goto finish;
/* Create a new playback stream */
if (!(s = pa_simple_new(NULL, argv[0], PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &error))) {
fprintf(stderr, __FILE__": pa_simple_new() failed: %s\n", pa_strerror(error));
goto finish;
for (;;) {
uint8_t buf[BUFSIZE];
ssize_t r;
#if 0
pa_usec_t latency;
if ((latency = pa_simple_get_latency(s, &error)) == (pa_usec_t) -1) {
fprintf(stderr, __FILE__": pa_simple_get_latency() failed: %s\n", pa_strerror(error));
goto finish;
fprintf(stderr, "%0.0f usec \r", (float)latency);
/* Read some data ... */
if ((r = read(STDIN_FILENO, buf, sizeof(buf))) <= 0) {
if (r == 0) /* EOF */
fprintf(stderr, __FILE__": read() failed: %s\n", strerror(errno));
goto finish;
/* ... and play it */
if (pa_simple_write(s, buf, (size_t) r, &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_write() failed: %s\n", pa_strerror(error));
goto finish;
/* Make sure that every single sample was played */
if (pa_simple_drain(s, &error) < 0) {
fprintf(stderr, __FILE__": pa_simple_drain() failed: %s\n", pa_strerror(error));
goto finish;
ret = 0;
if (s)
return ret;
Playback stream.
Definition: def.h:160
Error management.
const char * pa_strerror(int error)
Return a human readable error message for the specified numeric error code.
Signed 16 Bit PCM, little endian (PC)
Definition: sample.h:144
uint64_t pa_usec_t
Type for usec specifications (unsigned).
Definition: sample.h:264
A simple but limited synchronous playback and recording API.
int pa_simple_drain(pa_simple *s, int *error)
Wait until all data already written is played by the daemon.
pa_usec_t pa_simple_get_latency(pa_simple *s, int *error)
Return the playback or record latency.
void pa_simple_free(pa_simple *s)
Close and free the connection to the server.
pa_simple * pa_simple_new(const char *server, const char *name, pa_stream_direction_t dir, const char *dev, const char *stream_name, const pa_sample_spec *ss, const pa_channel_map *map, const pa_buffer_attr *attr, int *error)
Create a new connection to the server.
int pa_simple_write(pa_simple *s, const void *data, size_t bytes, int *error)
Write some data to the server.
A sample format and attribute specification.
Definition: sample.h:252
pa_sample_format_t format
The sample format.
Definition: sample.h:253
An opaque simple connection object.