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Corrections by Kevin Conder <kconder@interaccess.com>

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This commit is contained in:
Jaroslav Kysela 2002-03-12 20:14:33 +00:00
parent b559c97833
commit 853304bbf4
39 changed files with 386 additions and 386 deletions
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30
test/pcm.c
View file

@ -1,5 +1,5 @@
/*
* This small demo generates simple sinus wave on output of speakers.
* This small demo sends a simple sinusoidal wave to your speakers.
*/
#include <stdio.h>
@ -18,7 +18,7 @@ int rate = 44100; /* stream rate */
int channels = 1; /* count of channels */
int buffer_time = 500000; /* ring buffer length in us */
int period_time = 100000; /* period time in us */
double freq = 440; /* sinus wave frequency in Hz */
double freq = 440; /* sinusoidal wave frequency in Hz */
snd_pcm_sframes_t buffer_size;
snd_pcm_sframes_t period_size;
@ -105,14 +105,14 @@ static int set_hwparams(snd_pcm_t *handle,
printf("Rate doesn't match (requested %iHz, get %iHz)\n", rate, err);
return -EINVAL;
}
/* set buffer time */
/* set the buffer time */
err = snd_pcm_hw_params_set_buffer_time_near(handle, params, buffer_time, &dir);
if (err < 0) {
printf("Unable to set buffer time %i for playback: %s\n", buffer_time, snd_strerror(err));
return err;
}
buffer_size = snd_pcm_hw_params_get_buffer_size(params);
/* set period time */
/* set the period time */
err = snd_pcm_hw_params_set_period_time_near(handle, params, period_time, &dir);
if (err < 0) {
printf("Unable to set period time %i for playback: %s\n", period_time, snd_strerror(err));
@ -132,31 +132,31 @@ static int set_swparams(snd_pcm_t *handle, snd_pcm_sw_params_t *swparams)
{
int err;
/* get current swparams */
/* get the current swparams */
err = snd_pcm_sw_params_current(handle, swparams);
if (err < 0) {
printf("Unable to determine current swparams for playback: %s\n", snd_strerror(err));
return err;
}
/* start transfer when the buffer is full */
/* start the transfer when the buffer is full */
err = snd_pcm_sw_params_set_start_threshold(handle, swparams, buffer_size);
if (err < 0) {
printf("Unable to set start threshold mode for playback: %s\n", snd_strerror(err));
return err;
}
/* allow transfer when at least period_size samples can be processed */
/* allow the transfer when at least period_size samples can be processed */
err = snd_pcm_sw_params_set_avail_min(handle, swparams, period_size);
if (err < 0) {
printf("Unable to set avail min for playback: %s\n", snd_strerror(err));
return err;
}
/* align all transfers to 1 samples */
/* align all transfers to 1 sample */
err = snd_pcm_sw_params_set_xfer_align(handle, swparams, 1);
if (err < 0) {
printf("Unable to set transfer align for playback: %s\n", snd_strerror(err));
return err;
}
/* write the parameters to device */
/* write the parameters to the playback device */
err = snd_pcm_sw_params(handle, swparams);
if (err < 0) {
printf("Unable to set sw params for playback: %s\n", snd_strerror(err));
@ -171,14 +171,14 @@ static int set_swparams(snd_pcm_t *handle, snd_pcm_sw_params_t *swparams)
static int xrun_recovery(snd_pcm_t *handle, int err)
{
if (err == -EPIPE) { /* underrun */
if (err == -EPIPE) { /* under-run */
err = snd_pcm_prepare(handle);
if (err < 0)
printf("Can't recovery from underrun, prepare failed: %s\n", snd_strerror(err));
return 0;
} else if (err == -ESTRPIPE) {
while ((err = snd_pcm_resume(handle)) == -EAGAIN)
sleep(1); /* wait until suspend flag is released */
sleep(1); /* wait until the suspend flag is released */
if (err < 0) {
err = snd_pcm_prepare(handle);
if (err < 0)
@ -304,8 +304,8 @@ static int write_and_poll_loop(snd_pcm_t *handle,
cptr -= err;
if (cptr == 0)
break;
/* it is possible, that initial buffer cannot store */
/* all data from last period, so wait awhile */
/* it is possible, that the initial buffer cannot store */
/* all data from the last period, so wait awhile */
err = wait_for_poll(handle, ufds, count);
if (err < 0) {
if (snd_pcm_state(handle) == SND_PCM_STATE_XRUN ||
@ -554,7 +554,7 @@ Usage: latency [OPTION]... [FILE]...
-f,--frequency sine wave frequency in Hz
-b,--buffer ring buffer size in samples
-p,--period period size in us
-m,--method tranfer method
-m,--method transfer method
");
printf("Recognized sample formats are:");
@ -564,7 +564,7 @@ Usage: latency [OPTION]... [FILE]...
printf(" %s", s);
}
printf("\n");
printf("Recognized tranfer methods are:");
printf("Recognized transfer methods are:");
for (k = 0; transfer_methods[k].name; k++)
printf(" %s", transfer_methods[k].name);
printf("\n");