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First part of PCM documentation

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This commit is contained in:
Abramo Bagnara 2001-03-23 11:05:41 +00:00
parent 82fcfe1ab5
commit 445e2b0c07
7 changed files with 870 additions and 377 deletions
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70
src/pcm/pcm_params.c
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@ -1151,6 +1151,32 @@ void snd_pcm_hw_param_dump(const snd_pcm_hw_params_t *params,
assert(0);
}
#define HW_PARAM(v) [SND_PCM_HW_PARAM_##v] = #v
const char *snd_pcm_hw_param_names[] = {
HW_PARAM(ACCESS),
HW_PARAM(FORMAT),
HW_PARAM(SUBFORMAT),
HW_PARAM(SAMPLE_BITS),
HW_PARAM(FRAME_BITS),
HW_PARAM(CHANNELS),
HW_PARAM(RATE),
HW_PARAM(PERIOD_TIME),
HW_PARAM(PERIOD_SIZE),
HW_PARAM(PERIOD_BYTES),
HW_PARAM(PERIODS),
HW_PARAM(BUFFER_TIME),
HW_PARAM(BUFFER_SIZE),
HW_PARAM(BUFFER_BYTES),
HW_PARAM(TICK_TIME),
};
static const char *snd_pcm_hw_param_name(snd_pcm_hw_param_t param)
{
assert(param <= SND_PCM_HW_PARAM_LAST);
return snd_pcm_hw_param_names[snd_enum_to_int(param)];
}
int snd_pcm_hw_params_dump(snd_pcm_hw_params_t *params, snd_output_t *out)
{
unsigned int k;
@ -2152,47 +2178,3 @@ int _snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
return err;
}
int snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
{
int err;
assert(pcm && params);
err = _snd_pcm_hw_params(pcm, params);
if (err >= 0)
err = snd_pcm_prepare(pcm);
return err;
}
int snd_pcm_hw_free(snd_pcm_t *pcm)
{
int err;
assert(pcm->setup);
assert(snd_pcm_state(pcm) <= SND_PCM_STATE_PREPARED);
if (pcm->mmap_channels) {
err = snd_pcm_munmap(pcm);
if (err < 0)
return err;
}
err = pcm->ops->hw_free(pcm->op_arg);
pcm->setup = 0;
return err;
}
int snd_pcm_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
{
int err;
err = pcm->ops->sw_params(pcm->op_arg, params);
if (err < 0)
return err;
pcm->start_mode = snd_pcm_sw_params_get_start_mode(params);
pcm->xrun_mode = snd_pcm_sw_params_get_xrun_mode(params);
pcm->tstamp_mode = snd_pcm_sw_params_get_tstamp_mode(params);
pcm->period_step = params->period_step;
pcm->sleep_min = params->sleep_min;
pcm->avail_min = params->avail_min;
pcm->xfer_align = params->xfer_align;
pcm->silence_threshold = params->silence_threshold;
pcm->silence_size = params->silence_size;
pcm->boundary = params->boundary;
return 0;
}