ghedo · October 14, 2024 10:29 · gorluxgit · Dec 18, 2018 · Rime2509 · Jun 19, 2019
diff --git a/sound_playback.c b/sound_playback.c
 /*
 * Simple sound playback using ALSA API and libasound.
 *
 * Compile:
 * $ cc -o play sound_playback.c -lasound
 * 
 * Usage:
 * $ ./play <sample_rate> <channels> <seconds> < <file>
 * 
 * Examples:
 * $ ./play 44100 2 5 < /dev/urandom
 * $ ./play 22050 1 8 < /path/to/file.wav
 *
 * Copyright (C) 2009 Alessandro Ghedini <[email protected]>
 * --------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * Alessandro Ghedini wrote this file. As long as you retain this
 * notice you can do whatever you want with this stuff. If we
 * meet some day, and you think this stuff is worth it, you can
 * buy me a beer in return.
 * --------------------------------------------------------------
 */

 #include <alsa/asoundlib.h>
 #include <stdio.h>

 #define PCM_DEVICE "default"

 int main(int argc, char **argv) {
 	unsigned int pcm, tmp, dir;
 	int rate, channels, seconds;
 	snd_pcm_t *pcm_handle;
 	snd_pcm_hw_params_t *params;
 	snd_pcm_uframes_t frames;
 	char *buff;
 	int buff_size, loops;

 	if (argc < 4) {
 		printf("Usage: %s <sample_rate> <channels> <seconds>\n",
 								argv[0]);
 		return -1;
 	}

 	rate 	 = atoi(argv[1]);
 	channels = atoi(argv[2]);
 	seconds  = atoi(argv[3]);

 	/* Open the PCM device in playback mode */
 	if (pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE,
 					SND_PCM_STREAM_PLAYBACK, 0) < 0) 
 		printf("ERROR: Can't open \"%s\" PCM device. %s\n",
 					PCM_DEVICE, snd_strerror(pcm));

 	/* Allocate parameters object and fill it with default values*/
 	snd_pcm_hw_params_alloca(&params);

 	snd_pcm_hw_params_any(pcm_handle, params);

 	/* Set parameters */
 	if (pcm = snd_pcm_hw_params_set_access(pcm_handle, params,
 					SND_PCM_ACCESS_RW_INTERLEAVED) < 0) 
 		printf("ERROR: Can't set interleaved mode. %s\n", snd_strerror(pcm));

 	if (pcm = snd_pcm_hw_params_set_format(pcm_handle, params,
 						SND_PCM_FORMAT_S16_LE) < 0) 
 		printf("ERROR: Can't set format. %s\n", snd_strerror(pcm));

 	if (pcm = snd_pcm_hw_params_set_channels(pcm_handle, params, channels) < 0) 
 		printf("ERROR: Can't set channels number. %s\n", snd_strerror(pcm));

 	if (pcm = snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, 0) < 0) 
 		printf("ERROR: Can't set rate. %s\n", snd_strerror(pcm));

 	/* Write parameters */
 	if (pcm = snd_pcm_hw_params(pcm_handle, params) < 0)
 		printf("ERROR: Can't set harware parameters. %s\n", snd_strerror(pcm));

 	/* Resume information */
 	printf("PCM name: '%s'\n", snd_pcm_name(pcm_handle));

 	printf("PCM state: %s\n", snd_pcm_state_name(snd_pcm_state(pcm_handle)));

 	snd_pcm_hw_params_get_channels(params, &tmp);
 	printf("channels: %i ", tmp);

 	if (tmp == 1)
 		printf("(mono)\n");
 	else if (tmp == 2)
 		printf("(stereo)\n");

 	snd_pcm_hw_params_get_rate(params, &tmp, 0);
 	printf("rate: %d bps\n", tmp);

 	printf("seconds: %d\n", seconds);	

 	/* Allocate buffer to hold single period */
 	snd_pcm_hw_params_get_period_size(params, &frames, 0);

 	buff_size = frames * channels * 2 /* 2 -> sample size */;
 	buff = (char *) malloc(buff_size);

 	snd_pcm_hw_params_get_period_time(params, &tmp, NULL);

 	for (loops = (seconds * 1000000) / tmp; loops > 0; loops--) {

 		if (pcm = read(0, buff, buff_size) == 0) {
 			printf("Early end of file.\n");
 			return 0;
 		}

 		if (pcm = snd_pcm_writei(pcm_handle, buff, frames) == -EPIPE) {
 			printf("XRUN.\n");
 			snd_pcm_prepare(pcm_handle);
 		} else if (pcm < 0) {
 			printf("ERROR. Can't write to PCM device. %s\n", snd_strerror(pcm));
 		}

 	}

 	snd_pcm_drain(pcm_handle);
 	snd_pcm_close(pcm_handle);
 	free(buff);

 	return 0;
 }
	/*
	* Simple sound playback using ALSA API and libasound.
	*
	* Compile:
	* $ cc -o play sound_playback.c -lasound
	*
	* Usage:
	* $ ./play <sample_rate> <channels> <seconds> < <file>
	*
	* Examples:
	* $ ./play 44100 2 5 < /dev/urandom
	* $ ./play 22050 1 8 < /path/to/file.wav
	*
	* Copyright (C) 2009 Alessandro Ghedini <[email protected]>
	* --------------------------------------------------------------
	* "THE BEER-WARE LICENSE" (Revision 42):
	* Alessandro Ghedini wrote this file. As long as you retain this
	* notice you can do whatever you want with this stuff. If we
	* meet some day, and you think this stuff is worth it, you can
	* buy me a beer in return.
	* --------------------------------------------------------------
	*/

	#include <alsa/asoundlib.h>
	#include <stdio.h>

	#define PCM_DEVICE "default"

	int main(int argc, char **argv) {
	unsigned int pcm, tmp, dir;
	int rate, channels, seconds;
	snd_pcm_t *pcm_handle;
	snd_pcm_hw_params_t *params;
	snd_pcm_uframes_t frames;
	char *buff;
	int buff_size, loops;

	if (argc < 4) {
	printf("Usage: %s <sample_rate> <channels> <seconds>\n",
	argv[0]);
	return -1;
	}

	rate = atoi(argv[1]);
	channels = atoi(argv[2]);
	seconds = atoi(argv[3]);

	/* Open the PCM device in playback mode */
	if (pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE,
	SND_PCM_STREAM_PLAYBACK, 0) < 0)
	printf("ERROR: Can't open \"%s\" PCM device. %s\n",
	PCM_DEVICE, snd_strerror(pcm));

	/* Allocate parameters object and fill it with default values*/
	snd_pcm_hw_params_alloca(&params);

	snd_pcm_hw_params_any(pcm_handle, params);

	/* Set parameters */
	if (pcm = snd_pcm_hw_params_set_access(pcm_handle, params,
	SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
	printf("ERROR: Can't set interleaved mode. %s\n", snd_strerror(pcm));

	if (pcm = snd_pcm_hw_params_set_format(pcm_handle, params,
	SND_PCM_FORMAT_S16_LE) < 0)
	printf("ERROR: Can't set format. %s\n", snd_strerror(pcm));

	if (pcm = snd_pcm_hw_params_set_channels(pcm_handle, params, channels) < 0)
	printf("ERROR: Can't set channels number. %s\n", snd_strerror(pcm));

	if (pcm = snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, 0) < 0)
	printf("ERROR: Can't set rate. %s\n", snd_strerror(pcm));

	/* Write parameters */
	if (pcm = snd_pcm_hw_params(pcm_handle, params) < 0)
	printf("ERROR: Can't set harware parameters. %s\n", snd_strerror(pcm));

	/* Resume information */
	printf("PCM name: '%s'\n", snd_pcm_name(pcm_handle));

	printf("PCM state: %s\n", snd_pcm_state_name(snd_pcm_state(pcm_handle)));

	snd_pcm_hw_params_get_channels(params, &tmp);
	printf("channels: %i ", tmp);

	if (tmp == 1)
	printf("(mono)\n");
	else if (tmp == 2)
	printf("(stereo)\n");

	snd_pcm_hw_params_get_rate(params, &tmp, 0);
	printf("rate: %d bps\n", tmp);

	printf("seconds: %d\n", seconds);

	/* Allocate buffer to hold single period */
	snd_pcm_hw_params_get_period_size(params, &frames, 0);

	buff_size = frames * channels * 2 /* 2 -> sample size */;
	buff = (char *) malloc(buff_size);

	snd_pcm_hw_params_get_period_time(params, &tmp, NULL);

	for (loops = (seconds * 1000000) / tmp; loops > 0; loops--) {

	if (pcm = read(0, buff, buff_size) == 0) {
	printf("Early end of file.\n");
	return 0;
	}

	if (pcm = snd_pcm_writei(pcm_handle, buff, frames) == -EPIPE) {
	printf("XRUN.\n");
	snd_pcm_prepare(pcm_handle);
	} else if (pcm < 0) {
	printf("ERROR. Can't write to PCM device. %s\n", snd_strerror(pcm));
	}

	}

	snd_pcm_drain(pcm_handle);
	snd_pcm_close(pcm_handle);
	free(buff);

	return 0;
	}