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Added snd_pcm_hw_params_get_min_align; changed get_format, get_subformat and get_access function to return not mixed error and return value

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Jaroslav Kysela 2002-09-09 19:47:50 +00:00
parent c25879f9d9
commit 677b0f60d6
12 changed files with 108 additions and 33 deletions
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61
src/pcm/pcm.c
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@ -2719,11 +2719,19 @@ void snd_pcm_hw_params_copy(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t
/**
* \brief Extract access type from a configuration space
* \param params Configuration space
* \param val Returned value
* \return access type otherwise a negative error code if not exactly one is present
*/
int snd_pcm_hw_params_get_access(const snd_pcm_hw_params_t *params)
int snd_pcm_hw_params_get_access(const snd_pcm_hw_params_t *params, snd_pcm_access_t *val)
{
return snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_ACCESS, NULL);
int err;
assert(val);
err = snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_ACCESS, NULL);
if (err < 0)
return err;
*val = err;
return 0;
}
/**
@ -2806,11 +2814,19 @@ void snd_pcm_hw_params_get_access_mask(snd_pcm_hw_params_t *params, snd_pcm_acce
/**
* \brief Extract format from a configuration space
* \param params Configuration space
* \param val returned format
* \return format otherwise a negative error code if not exactly one is present
*/
int snd_pcm_hw_params_get_format(const snd_pcm_hw_params_t *params)
int snd_pcm_hw_params_get_format(const snd_pcm_hw_params_t *params, snd_pcm_format_t *val)
{
return snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_FORMAT, NULL);
int err;
assert(val);
err = snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_FORMAT, NULL);
if (err < 0)
return err;
*val = err;
return 0;
}
/**
@ -2905,11 +2921,19 @@ int snd_pcm_hw_params_test_subformat(snd_pcm_t *pcm, snd_pcm_hw_params_t *params
/**
* \brief Extract subformat from a configuration space
* \param params Configuration space
* \param val Returned subformat
* \return subformat otherwise a negative error code if not exactly one is present
*/
int snd_pcm_hw_params_get_subformat(const snd_pcm_hw_params_t *params)
int snd_pcm_hw_params_get_subformat(const snd_pcm_hw_params_t *params, snd_pcm_subformat_t *val)
{
return snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_SUBFORMAT, NULL);
int err;
assert(val);
err = snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_SUBFORMAT, NULL);
if (err < 0)
return err;
*val = (snd_pcm_subformat_t)err;
return 0;
}
/**
@ -4346,6 +4370,31 @@ unsigned int snd_pcm_hw_params_set_tick_time_last(snd_pcm_t *pcm, snd_pcm_hw_par
return res;
}
/**
* \brief Get the minimum transfer align value in samples
* \param params Configuration space
* \return minimum align value otherwise a negative error code if not exactly one is present
*/
snd_pcm_sframes_t snd_pcm_hw_params_get_min_align(const snd_pcm_hw_params_t *params)
{
int format, channels, fb, min_align;
format = snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_FORMAT, NULL);
if (format < 0)
return format;
channels = snd_pcm_hw_param_get(params, SND_PCM_HW_PARAM_CHANNELS, NULL);
if (channels < 0)
return channels;
// compute frame bits
fb = snd_pcm_format_physical_width(format) * channels;
min_align = 1;
while (fb % 8) {
fb *= 2;
min_align *= 2;
}
return min_align;
}
/**
* \brief Return current software configuration for a PCM
* \param pcm PCM handle