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Added snd_pcm_hw_params_current() function and clear() functions for structures

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This commit is contained in:
Jaroslav Kysela 2002-10-12 10:38:43 +00:00
parent 453dd9f698
commit dac0626b9f
6 changed files with 56 additions and 2 deletions
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35
src/pcm/pcm.c
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@ -734,6 +734,41 @@ int snd_pcm_info(snd_pcm_t *pcm, snd_pcm_info_t *info)
return pcm->ops->info(pcm->op_arg, info);
}
/** \brief Retreive current PCM hardware configuration chosen with #snd_pcm_hw_params
* \param pcm PCM handle
* \param params Configuration space definition container
* \return 0 on success otherwise a negative error code
*/
int snd_pcm_hw_params_current(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
unsigned int frame_bits;
assert(pcm && params);
if (!pcm->setup)
return -EBADFD;
snd_pcm_hw_params_clear(params);
snd_mask_copy(&params->masks[SND_PCM_HW_PARAM_ACCESS], (snd_mask_t *)&pcm->access);
snd_mask_copy(&params->masks[SND_PCM_HW_PARAM_FORMAT], (snd_mask_t *)&pcm->format);
snd_mask_copy(&params->masks[SND_PCM_HW_PARAM_SUBFORMAT], (snd_mask_t *)&pcm->subformat);
frame_bits = snd_pcm_format_physical_width(pcm->format) * pcm->channels;
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_FRAME_BITS], frame_bits);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_CHANNELS], pcm->channels);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_RATE], pcm->rate);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_PERIOD_TIME], pcm->period_time);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_PERIOD_SIZE], pcm->period_size);
snd_interval_copy(&params->intervals[SND_PCM_HW_PARAM_PERIODS], &pcm->periods);
snd_interval_copy(&params->intervals[SND_PCM_HW_PARAM_BUFFER_TIME], &pcm->buffer_time);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_BUFFER_SIZE], pcm->buffer_size);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_BUFFER_BYTES], (pcm->buffer_size * frame_bits) / 8);
snd_interval_set_value(&params->intervals[SND_PCM_HW_PARAM_TICK_TIME], pcm->tick_time);
params->info = pcm->info;
params->msbits = pcm->msbits;
params->rate_num = pcm->rate_num;
params->rate_den = pcm->rate_den;
params->fifo_size = pcm->fifo_size;
return 0;
}
/** \brief Install one PCM hardware configuration chosen from a configuration space and #snd_pcm_prepare it
* \param pcm PCM handle
* \param params Configuration space definition container