countdown/play_raw_audio.c

#include "play_raw_audio.h"
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <pulse/simple.h>
#include <pulse/error.h>

int play_raw_audio(char file_name[]) {
	int pa_error = 0;
	char content[1024] = "";

	int myfd = open(file_name, O_RDONLY);
	if (myfd == -1) {
		perror("Failed to open audio file");
		return 1;
	}

	pa_simple* simple = NULL;
	pa_sample_spec ss;
	ss.format = PA_SAMPLE_S16LE;
	ss.rate = 48000;
	ss.channels = 2;

	// Temporarily redirect stderr to /dev/null
	// because pulseaudio prints to stderr even though it does not set any error codes
	FILE *original_stderr = stderr;
	stderr = fopen("/dev/null", "w");

	simple = pa_simple_new(NULL, "Audio Playback", PA_STREAM_PLAYBACK, NULL, "playback", &ss, NULL, NULL, &pa_error);

	// Restore stderr
	stderr = original_stderr;

	int i = 0;
	while (read(myfd, content, sizeof(content))) {
		// skip the first 1024 bytes to not play the file header
		if (i != 0) {
			pa_simple_write(simple, content, sizeof(content), &pa_error);
		}
		i++;
	}

	pa_simple_drain(simple, NULL);

	pa_simple_free(simple);

	close(myfd);

	return 0;
}