Blame test/chmap.c

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/*
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 * channel mapping API test program
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <getopt.h>
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#include "../include/asoundlib.h"
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static void usage(void)
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{
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	printf("usage: chmap [options] query\n"
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	       "       chmap [options] get\n"
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	       "       chmap [options] set CH0 CH1 CH2...\n"
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	       "options:\n"
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	       "  -D device     Specify PCM device to handle\n"
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	       "  -s stream     Specify PCM stream direction (playback/capture)\n"
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	       "  -f format     PCM format\n"
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	       "  -c channels   Channels\n"
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	       "  -r rate       Sample rate\n");
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}
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static void print_channels(const snd_pcm_chmap_t *map)
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{
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	char tmp[128];
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	if (snd_pcm_chmap_print(map, sizeof(tmp), tmp) > 0)
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		printf("  %s\n", tmp);
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}
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static int query_chmaps(snd_pcm_t *pcm)
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{
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	snd_pcm_chmap_query_t **maps = snd_pcm_query_chmaps(pcm);
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	snd_pcm_chmap_query_t **p, *v;
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	if (!maps) {
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		printf("Cannot query maps\n");
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		return 1;
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	}
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	for (p = maps; (v = *p) != NULL; p++) {
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		printf("Type = %s, Channels = %d\n",
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		       snd_pcm_chmap_type_name(v->type),
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		       v->map.channels);
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		print_channels(&v->map);
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	}
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	snd_pcm_free_chmaps(maps);
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	return 0;
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}
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static int setup_pcm(snd_pcm_t *pcm, int format, int channels, int rate)
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{
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	snd_pcm_hw_params_t *params;
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	snd_pcm_hw_params_alloca(&params);
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	if (snd_pcm_hw_params_any(pcm, params) < 0) {
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		printf("Cannot init hw_params\n");
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		return -1;
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	}
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	if (format != SND_PCM_FORMAT_UNKNOWN) {
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		if (snd_pcm_hw_params_set_format(pcm, params, format) < 0) {
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			printf("Cannot set format %s\n",
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			       snd_pcm_format_name(format));
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			return -1;
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		}
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	}
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	if (channels > 0) {
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		if (snd_pcm_hw_params_set_channels(pcm, params, channels) < 0) {
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			printf("Cannot set channels %d\n", channels);
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			return -1;
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		}
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	}
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	if (rate > 0) {
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		if (snd_pcm_hw_params_set_rate_near(pcm, params, (unsigned int *)&rate, 0) < 0) {
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			printf("Cannot set rate %d\n", rate);
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			return -1;
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		}
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	}
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	if (snd_pcm_hw_params(pcm, params) < 0) {
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		printf("Cannot set hw_params\n");
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		return -1;
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	}
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	return 0;
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}
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static int get_chmap(snd_pcm_t *pcm, int format, int channels, int rate)
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{
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	snd_pcm_chmap_t *map;
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	if (setup_pcm(pcm, format, channels, rate))
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		return 1;
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	map = snd_pcm_get_chmap(pcm);
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	if (!map) {
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		printf("Cannot get chmap\n");
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		return 1;
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	}
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	printf("Channels = %d\n", map->channels);
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	print_channels(map);
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	free(map);
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	return 0;
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}
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static int set_chmap(snd_pcm_t *pcm, int format, int channels, int rate,
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		     int nargs, char **arg)
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{
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	int i;
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	snd_pcm_chmap_t *map;
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	if (channels && channels != nargs) {
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		printf("Inconsistent channels %d vs %d\n", channels, nargs);
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		return 1;
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	}
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	if (!channels) {
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		if (!nargs) {
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			printf("No channels are given\n");
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			return 1;
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		}
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		channels = nargs;
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	}
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	if (setup_pcm(pcm, format, channels, rate))
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		return 1;
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	map = malloc(sizeof(int) * (channels + 1));
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	if (!map) {
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		printf("cannot malloc\n");
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		return 1;
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	}
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	map->channels = channels;
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	for (i = 0; i < channels; i++) {
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		int val = snd_pcm_chmap_from_string(arg[i]);
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		if (val < 0)
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			val = SND_CHMAP_UNKNOWN;
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		map->pos[i] = val;
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	}
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	if (snd_pcm_set_chmap(pcm, map) < 0) {
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		printf("Cannot set chmap\n");
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		return 1;
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	}
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	free(map);
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	map = snd_pcm_get_chmap(pcm);
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	if (!map) {
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		printf("Cannot get chmap\n");
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		return 1;
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	}
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	printf("Get channels = %d\n", map->channels);
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	print_channels(map);
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	free(map);
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	return 0;
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}
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int main(int argc, char **argv)
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{
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	char *device = NULL;
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	int stream = SND_PCM_STREAM_PLAYBACK;
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	int format = SND_PCM_FORMAT_UNKNOWN;
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	int channels = 0;
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	int rate = 0;
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	snd_pcm_t *pcm;
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	int c;
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	while ((c = getopt(argc, argv, "D:s:f:c:r:")) != -1) {
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		switch (c) {
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		case 'D':
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			device = optarg;
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			break;
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		case 's':
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			if (*optarg == 'c' || *optarg == 'C')
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				stream = SND_PCM_STREAM_CAPTURE;
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			else
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				stream = SND_PCM_STREAM_PLAYBACK;
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			break;
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		case 'f':
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			format = snd_pcm_format_value(optarg);
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			break;
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		case 'c':
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			channels = atoi(optarg);
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			break;
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		case 'r':
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			rate = atoi(optarg);
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			break;
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		default:
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			usage();
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			return 1;
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		}
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	}
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	if (argc <= optind) {
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		usage();
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		return 1;
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	}
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	if (!device) {
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		printf("No device is specified\n");
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		return 1;
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	}
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	if (snd_pcm_open(&pcm, device, stream, SND_PCM_NONBLOCK) < 0) {
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		printf("Cannot open PCM stream %s for %s\n", device,
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		       snd_pcm_stream_name(stream));
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		return 1;
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	}
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	switch (*argv[optind]) {
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	case 'q':
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		return query_chmaps(pcm);
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	case 'g':
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		return get_chmap(pcm, format, channels, rate);
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	case 's':
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		return set_chmap(pcm, format, channels, rate,
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				 argc - optind - 1, argv + optind + 1);
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	}
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	usage();
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	return 1;
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}