| 22,7 → 22,6 |
|---|
| static unsigned int rate = 98000; /* stream rate */ |
| static unsigned int buffer_time = 500000; /* ring buffer length in us */ |
| static unsigned int period_time = 100000; /* period time in us */ |
| static int verbose = 0; /* verbose flag */ |
| static int resample = 1; /* enable alsa-lib resampling */ |
| static int period_event = 0; /* produce poll event after each period */ |
| |
| 190,8 → 189,8 |
|---|
| { |
| unsigned int maxval = (1 << (snd_pcm_format_width(format) - 1)) - 1; |
| |
| static const float f0 = 1000; |
| static const float fmax = 7000; |
| static const float f0 = 1000; //starting frequency |
| static const float fmax = 7000; //ending frequency |
| static const float Tw = 0.002; |
| static float k; |
| |
| 238,9 → 237,6 |
|---|
| static void async_playback_callback(snd_async_handler_t *ahandler) |
| { |
| snd_pcm_t *handle = snd_async_handler_get_pcm(ahandler); |
| /* struct async_private_data *data = snd_async_handler_get_callback_private(ahandler); |
| signed short *samples = data->samples; |
| snd_pcm_channel_area_t *areas = data->areas;*/ |
| snd_pcm_sframes_t avail; |
| int err; |
| |
| 264,9 → 260,6 |
|---|
| static void async_capture_callback(snd_async_handler_t *ahandler) |
| { |
| snd_pcm_t *handle = snd_async_handler_get_pcm(ahandler); |
| /* struct async_private_data *data = snd_async_handler_get_callback_private(ahandler); |
| signed short *samples = data->samples; |
| snd_pcm_channel_area_t *areas = data->areas;*/ |
| snd_pcm_sframes_t avail; |
| int err; |
| |
| 346,18 → 339,25 |
|---|
| exit(EXIT_FAILURE); |
| } |
| |
| /// generate ping pattern |
| // generate ping pattern |
| |
| chirp_size=linear_windowed_chirp(chirp,1000000, CHIRP_OFFSET); |
| |
| /// register playback callback |
| // register playback callback |
| err = snd_async_add_pcm_handler(&phandler, playback_handle, async_playback_callback, &data); // fill by dummy &data |
| if (err < 0) { |
| printf("Unable to register async handler\n"); |
| exit(EXIT_FAILURE); |
| } |
| for (period = 0; period < 2; period++) { |
| |
| if ((err = snd_pcm_prepare (playback_handle)) < 0) { |
| fprintf (stderr, "cannot prepare audio interface for use (%s)\n", |
| snd_strerror (err)); |
| exit (1); |
| } |
| |
| /* for (period = 0; period < 2; period++) { |
| |
| err = snd_pcm_writei(playback_handle, (chirp+period*period_size), period_size); |
| if (err < 0) { |
| printf("Initial write error: %s\n", snd_strerror(err)); |
| 367,7 → 367,7 |
|---|
| printf("Initial write error: written %i expected %li\n", err, period_size); |
| exit(EXIT_FAILURE); |
| } |
| } |
| }*/ |
| |
| // register capture callback |
| err = snd_async_add_pcm_handler(&chandler, capture_handle, async_capture_callback, &data); // fill by dummy &data |
| 437,7 → 437,7 |
|---|
| } |
| } |
| |
| out=fopen("./output.txt","w"); |
| out=fopen("/tmp/sonar.txt","w"); |
| j=0; |
| for(i=0;i<=100000;i++){ |
| fprintf(out,"%6d %6d %6d %6d %9ld %9ld\n",i,chirp[i],L_signal[i],R_signal[i],correlationl[i], correlationr[i]); |