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snd_pcm_set_params() - added workaround for vortex driver

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This commit is contained in:
Jaroslav Kysela 2006-01-31 09:16:05 +00:00
parent eccc92a34d
commit 937f396663
1 changed files with 58 additions and 25 deletions
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83
src/pcm/pcm.c
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@ -579,6 +579,11 @@ The full featured examples with cross-links:
\par \par
This example shows various transfer methods for the playback direction. This example shows various transfer methods for the playback direction.
\par Minimalistic PCM playback code
\ref example_test_pcm_min "example code"
\par
This example shows the minimal code to produce a sound.
\par Latency measuring tool \par Latency measuring tool
\ref example_test_latency "example code" \ref example_test_latency "example code"
\par \par
@ -591,6 +596,10 @@ playback devices.
* \example ../test/pcm.c * \example ../test/pcm.c
* \anchor example_test_pcm * \anchor example_test_pcm
*/ */
/**
* \example ../test/pcm_min.c
* \anchor example_test_pcm_min
*/
/** /**
* \example ../test/latency.c * \example ../test/latency.c
* \anchor example_test_latency * \anchor example_test_latency
@ -7131,31 +7140,55 @@ int snd_pcm_set_params(snd_pcm_t *pcm,
/* set the buffer time */ /* set the buffer time */
err = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(pcm, params, &latency, NULL); err = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(pcm, params, &latency, NULL);
if (err < 0) { if (err < 0) {
SNDERR("Unable to set buffer time (latency) %i for %s: %s", latency, s, snd_strerror(err)); /* error path -> set period size as first */
return err; /* set the period time */
} period_time = latency / 4;
err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, &buffer_size); err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, params, &period_time, NULL);
if (err < 0) { if (err < 0) {
SNDERR("Unable to get buffer size for %s: %s", s, snd_strerror(err)); SNDERR("Unable to set period time %i for %s: %s", s, period_time, snd_strerror(err));
return err; return err;
} }
err = INTERNAL(snd_pcm_hw_params_get_buffer_time)(params, &latency, NULL); err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, &period_size, NULL);
if (err < 0) { if (err < 0) {
SNDERR("Unable to get buffer time (latency) for %s: %s", s, snd_strerror(err)); SNDERR("Unable to get period size for %s: %s", s, snd_strerror(err));
return err; return err;
} }
/* set the period time */ buffer_size = period_size * 4;
period_time = latency / 4; err = INTERNAL(snd_pcm_hw_params_set_buffer_size_near)(pcm, params, &buffer_size);
err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, params, &period_time, NULL); if (err < 0) {
if (err < 0) { SNDERR("Unable to set buffer size %lu %s: %s", buffer_size, s, snd_strerror(err));
SNDERR("Unable to set period time %i for %s: %s", s, period_time, snd_strerror(err)); return err;
return err; }
} err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, &buffer_size);
err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, &period_size, NULL); if (err < 0) {
if (err < 0) { SNDERR("Unable to get buffer size for %s: %s", s, snd_strerror(err));
SNDERR("Unable to get period size for %s: %s", s, snd_strerror(err)); return err;
return err; }
} } else {
/* standard configuration buffer_time -> periods */
err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, &buffer_size);
if (err < 0) {
SNDERR("Unable to get buffer size for %s: %s", s, snd_strerror(err));
return err;
}
err = INTERNAL(snd_pcm_hw_params_get_buffer_time)(params, &latency, NULL);
if (err < 0) {
SNDERR("Unable to get buffer time (latency) for %s: %s", s, snd_strerror(err));
return err;
}
/* set the period time */
period_time = latency / 4;
err = INTERNAL(snd_pcm_hw_params_set_period_time_near)(pcm, params, &period_time, NULL);
if (err < 0) {
SNDERR("Unable to set period time %i for %s: %s", s, period_time, snd_strerror(err));
return err;
}
err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, &period_size, NULL);
if (err < 0) {
SNDERR("Unable to get period size for %s: %s", s, snd_strerror(err));
return err;
}
}
/* write the parameters to device */ /* write the parameters to device */
err = snd_pcm_hw_params(pcm, params); err = snd_pcm_hw_params(pcm, params);
if (err < 0) { if (err < 0) {