Subversion Repositories svnkaklik

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

        int exact_rate = 44100;
#define BUFFER_SIZE     1024

        main (int argc, char *argv[])
        {
                int i,j;
                int err;
                short buf[BUFFER_SIZE];
                snd_pcm_t *capture_handle;
                snd_pcm_hw_params_t *hw_params;
        
                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);
                }
                   
fprintf (stdout,"nastaveni formatu\n");

                if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0) {
                        fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
                                 snd_strerror (err));
                        exit (1);
                }
                                 
                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);
                }
        
                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);
                }
        
                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);
                }
fprintf (stdout,"nastaveni formatu\n");
        
                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);
                }
fprintf (stdout,"nastaveni vzorkovani\n");
        
                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);
                }
        
fprintf (stdout,"nastaveni poctu kanalu\n");

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

fprintf (stdout,"nastaveni parametru\n");
        
                snd_pcm_hw_params_free (hw_params);
        
                if ((err = snd_pcm_prepare (capture_handle)) < 0) {
                        fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
                                 snd_strerror (err));
                        exit (1);
                }
fprintf (stdout,"povoleni audia\n");
        

                if ((err = snd_pcm_readi (capture_handle, buf, BUFFER_SIZE)) != BUFFER_SIZE) {
                                fprintf (stderr, "read from audio interface failed (%s)\n",
                                         snd_strerror (err));
                                exit (1);

                }       
                for (j=0; j < 500; j=j+2) fprintf (stdout,"%u:%d %d\n ",j,buf[j], buf[j+1]);    

                snd_pcm_close (capture_handle);
                exit (0);
        }