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/programy/C/ix86/sound/playback.c
0,0 → 1,173
//ALSA Audio playback testing program
//
 
#include <stdio.h>
#include <stdlib.h>
 
#include <alsa/asoundlib.h>
 
int exact_rate=44100;
 
 
int linear_chirp(int *pole, int delka_pole, int spozdeni){ // vygeneruje linearni chirp a vzorky ulozi do pole
 
static const double pi = 3.141592653589793238462643383279502884197; // Archimedes constant pi
static const float f0 = 0.01;
static const float k = 0.0001;
 
int t;
float ble;
if((spozdeni+delka_pulsu) < delka_pole)
for(t=0;t < delka_pulsu;t++) pole[spozdeni+t] = round ( 100*sin(2*pi*t*(f0+(k/2)*t)) );
else return 0;
 
}
 
static void async_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;
avail = snd_pcm_avail_update(handle);
while (avail >= period_size) {
generate_sine(areas, 0, period_size, &data->phase);
 
err = snd_pcm_writei(handle, samples, period_size);
if (err < 0) {
printf("Write error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
if (err != period_size) {
printf("Write error: written %i expected %li\n", err, period_size);
exit(EXIT_FAILURE);
}
avail = snd_pcm_avail_update(handle);
}
}
 
static int async_loop(snd_pcm_t *handle,
signed short *samples,
snd_pcm_channel_area_t *areas)
{
struct async_private_data data;
snd_async_handler_t *ahandler;
int err, count;
unsigned int i;
 
data.samples = samples;
data.areas = areas;
data.phase = 0;
err = snd_async_add_pcm_handler(&ahandler, handle, async_callback, &data);
if (err < 0) {
printf("Unable to register async handler\n");
exit(EXIT_FAILURE);
}
for (count = 0; count < 2; count++) {
generate_sine(areas, 0, period_size, &data.phase);
err = snd_pcm_writei(handle, samples, period_size);
if (err < 0) {
printf("Initial write error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
if (err != period_size) {
printf("Initial write error: written %i expected %li\n", err, period_size);
exit(EXIT_FAILURE);
}
}
if (snd_pcm_state(handle) == SND_PCM_STATE_PREPARED) {
err = snd_pcm_start(handle);
if (err < 0) {
printf("Start error: %s\n", snd_strerror(err));
exit(EXIT_FAILURE);
}
}
 
/* because all other work is done in the signal handler,
suspend the process */
for(i=0; i<=10;i++) {
sleep(1);
}
}
main (int argc, char *argv[])
{
int i;
int err;
short buf[128];
snd_pcm_t *playback_handle;
snd_pcm_hw_params_t *hw_params;
snd_pcm_channel_area_t *areas;
if ((err = snd_pcm_open (&playback_handle, argv[1], SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
fprintf (stderr, "cannot open audio device %s (%s)\n",
argv[1],
snd_strerror (err));
exit (1);
}
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 (playback_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 (playback_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 (playback_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
fprintf (stderr, "cannot set sample format (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_rate_near (playback_handle, hw_params, &exact_rate, 0)) < 0) {
fprintf (stderr, "cannot set sample rate (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params_set_channels (playback_handle, hw_params, 2)) < 0) {
fprintf (stderr, "cannot set channel count (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_hw_params (playback_handle, hw_params)) < 0) {
fprintf (stderr, "cannot set parameters (%s)\n",
snd_strerror (err));
exit (1);
}
if ((err = snd_pcm_prepare (playback_handle)) < 0) {
fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
snd_strerror (err));
exit (1);
}
async_loop(playback_handle, samples, areas);
 
/* for (i = 0; i < 100; ++i) {
if ((err = snd_pcm_writei (playback_handle, buf, 128)) != 128) {
fprintf (stderr, "write to audio interface failed (%s)\n",
snd_strerror (err));
exit (1);
}
}*/
snd_pcm_close (playback_handle);
exit (0);
}
 
/programy/C/ix86/sound/capture.c
0,0 → 1,94
#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);
}
 
/programy/C/ix86/sound/duplex.c
0,0 → 1,166
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <poll.h>
#include <alsa/asoundlib.h>
 
/* you allocate these in heap */
int restarting;
int fragments = 2;
int channels = 1;
int buffer_size = 512;
int sample_rate = 48000;
int frame_size = 1024;
int bits = 16;
 
char *snd_device_in = "plughw:0,0";
char *snd_device_out = "plughw:0,0";
snd_pcm_t *playback_handle;
snd_pcm_t *capture_handle;
 
int err;
 
int configure_alsa_audio(snd_pcm_t *device, int channels)
{
snd_pcm_hw_params_t *hw_params;
int err;
int tmp;
 
snd_pcm_uframes_t frames;
 
/* allocate memory for hardware parameter structure */
if ((err = snd_pcm_hw_params_malloc(&hw_params)) < 0) {
fprintf (stderr, "cannot allocate parameter structure (%s)\n",
snd_strerror(err));
return 1;
}
/* fill structure from current audio parameters */
if ((err = snd_pcm_hw_params_any(device, hw_params)) < 0) {
fprintf (stderr, "cannot initialize parameter structure (%s)\n",
snd_strerror(err));
return 1;
}
 
/* set access type, sample rate, sample format, channels */
if ((err = snd_pcm_hw_params_set_access(device, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
fprintf (stderr, "cannot set access type: %s\n",
snd_strerror(err));
return 1;
}
// bits = 16
if ((err = snd_pcm_hw_params_set_format(device, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
fprintf (stderr, "cannot set sample format: %s\n",
snd_strerror(err));
return 1;
}
tmp = sample_rate;
if ((err = snd_pcm_hw_params_set_rate_near(device, hw_params, &tmp, 0)) < 0) {
fprintf (stderr, "cannot set sample rate: %s\n",
snd_strerror(err));
return 1;
}
if (tmp != sample_rate) {
fprintf(stderr, "Could not set requested sample rate, asked for %d got %d\n", sample_rate, tmp);
sample_rate = tmp;
}
if ((err = snd_pcm_hw_params_set_channels(device, hw_params, channels)) < 0) {
fprintf (stderr, "cannot set channel count: %s\n",
snd_strerror(err));
return 1;
}
 
if ((err = snd_pcm_hw_params_set_periods_near(device, hw_params, &fragments, 0)) < 0) {
fprintf(stderr, "Error setting # fragments to %d: %s\n", fragments,
snd_strerror(err));
return 1;
}
 
frame_size = channels * (bits / 8);
frames = buffer_size / frame_size * fragments;
if ((err = snd_pcm_hw_params_set_buffer_size_near(device, hw_params, &frames)) < 0) {
fprintf(stderr, "Error setting buffer_size %d frames: %s\n", frames,
snd_strerror(err));
return 1;
}
if (buffer_size != frames * frame_size / fragments) {
fprintf(stderr, "Could not set requested buffer size, asked for %d got %d\n", buffer_size, frames * frame_size / fragments);
buffer_size = frames * frame_size / fragments;
}
if ((err = snd_pcm_hw_params(device, hw_params)) < 0) {
fprintf(stderr, "Error setting HW params: %s\n",
snd_strerror(err));
return 1;
}
return 0;
}
main (void)
{
int i,frames, inframes, outframes, frame_size;
 
if ((err = snd_pcm_open(&playback_handle, snd_device_out, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
fprintf(stderr, "cannot open output audio device %s: %s\n", snd_device_in, snd_strerror(err));
exit(1);
}
 
if ((err = snd_pcm_open(&capture_handle, snd_device_in, SND_PCM_STREAM_CAPTURE, 0)) < 0) {
fprintf(stderr, "cannot open input audio device %s: %s\n", snd_device_out, snd_strerror(err));
exit(1);
}
 
configure_alsa_audio(snd_device_in, channels);
configure_alsa_audio(snd_device_out, channels);
 
restarting = 1;
 
while (1) {
frame_size = channels * (bits / 8);
frames = buffer_size / frame_size;
 
if (restarting) {
restarting = 0;
/* drop any output we might got and stop */
snd_pcm_drop(capture_handle);
snd_pcm_drop(playback_handle);
/* prepare for use */
snd_pcm_prepare(capture_handle);
snd_pcm_prepare(playback_handle);
 
/* fill the whole output buffer */
for (i = 0; i < fragments; i += 1)
snd_pcm_writei(playback_handle, rdbuf, frames);
}
 
while ((inframes = snd_pcm_readi(capture_handle, rdbuf, frames)) < 0) {
if (inframes == -EAGAIN)
continue;
// by the way, writing to terminal emulator is costly if you use
// bad emulators like gnome-terminal, so don't do this.
fprintf(stderr, "Input buffer overrun\n");
restarting = 1;
snd_pcm_prepare(capture_handle);
}
if (inframes != frames)
fprintf(stderr, "Short read from capture device: %d, expecting %d\n", inframes, frames);
 
/* now processes the frames */
do_something(rdbuf, inframes);
 
while ((outframes = snd_pcm_writei(playback_handle, rdbuf, inframes)) < 0) {
if (outframes == -EAGAIN)
continue;
fprintf(stderr, "Output buffer underrun\n");
restarting = 1;
snd_pcm_prepare(playback_handle);
}
if (outframes != inframes)
fprintf(stderr, "Short write to playback device: %d, expecting %d\n", outframes, frames);
 
 
snd_pcm_close(snd_device_out);
snd_pcm_close(snd_device_in);
exit (0);
}
 
Property changes:
Added: svn:mergeinfo