/* to compile:
 * gcc -lasound alsa_test_cap.c -o alsa_test_cap
 *
 * to run
 * ./alsa_test_cap default
 */
#include <stdio.h>
	#include <stdlib.h>
	#include <alsa/asoundlib.h>
	      
	main (int argc, char *argv[])
	{
		int i;
		int err;
		short buf[128];
		snd_pcm_t *capture_handle;
		snd_pcm_hw_params_t *hw_params;

        int exact_rate = 44100;

        int cp=0;

        if (argc!=2) {
          printf("provide thing\n");
          exit(0);
        }

        printf("cp %i\n", cp++); fflush(stdout);
	
		if ((err = snd_pcm_open (&capture_handle, argv[1], SND_PCM_STREAM_CAPTURE, 0)) < 0) {
			fprintf (stderr, "cannot open audio device %s (%s)\n", 
				 argv[1],
				 snd_strerror (err));
			exit (1);
		}

        //printf("..\n"); fflush(stdout); snd_pcm_close(capture_handle);
        printf("cp %i\n", cp++); fflush(stdout);
		   
		if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
			fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("cp %i\n", cp++); fflush(stdout);
				 
		if ((err = snd_pcm_hw_params_any (capture_handle, hw_params)) < 0) {
			fprintf (stderr, "cannot initialize hardware parameter structure (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("cp %i\n", cp++); fflush(stdout);
	
		if ((err = snd_pcm_hw_params_set_access (capture_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
			fprintf (stderr, "cannot set access type (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("cp %i\n", cp++); fflush(stdout);
	
		if ((err = snd_pcm_hw_params_set_format (capture_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
			fprintf (stderr, "cannot set sample format (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("cp %i\n", cp++); fflush(stdout);
	
		if ((err = snd_pcm_hw_params_set_rate_near (capture_handle, hw_params, &exact_rate, 0)) < 0) {
			fprintf (stderr, "cannot set sample rate (%s)\n",
				 snd_strerror (err));
			exit (1);
		}
	
        printf("cp %i\n", cp++); fflush(stdout);

		if ((err = snd_pcm_hw_params_set_channels (capture_handle, hw_params, 2)) < 0) {
			fprintf (stderr, "cannot set channel count (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("cp %i\n", cp++); fflush(stdout);
	
		if ((err = snd_pcm_hw_params (capture_handle, hw_params)) < 0) {
			fprintf (stderr, "cannot set parameters (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("...\n");
        printf("cp %i\n", cp++); fflush(stdout);
	
		snd_pcm_hw_params_free (hw_params);

        printf("...\n"); fflush(stdout);
	
		if ((err = snd_pcm_prepare (capture_handle)) < 0) {
			fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
				 snd_strerror (err));
			exit (1);
		}

        printf("....\n"); fflush(stdout);
	
		for (i = 0; i < 10; ++i) {
			if ((err = snd_pcm_readi (capture_handle, buf, 128)) != 128) {
				fprintf (stderr, "read from audio interface failed (%s)\n",
					 snd_strerror (err));
				exit (1);
			}
		}

        printf(".....\n"); fflush(stdout);
	
		snd_pcm_close (capture_handle);

        printf("???\n"); fflush(stdout);

		exit (0);
	}