ALSA project - the C library reference
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See the PCM (digital audio) interface page for more details.
int snd_pcm_meter_add_scope | ( | snd_pcm_t * | pcm, |
snd_pcm_scope_t * | scope | ||
) |
Add a scope to a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
scope | Scope handle |
Get boundary for frame pointers from a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
Get meter buffer size from a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
unsigned int snd_pcm_meter_get_channels | ( | snd_pcm_t * | pcm | ) |
Get meter channels from a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
Get meter "now" frame pointer from a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
unsigned int snd_pcm_meter_get_rate | ( | snd_pcm_t * | pcm | ) |
snd_pcm_scope_t* snd_pcm_meter_search_scope | ( | snd_pcm_t * | pcm, |
const char * | name | ||
) |
Search an installed scope inside a SND_PCM_TYPE_METER PCM.
pcm | PCM handle |
name | scope name |
void* snd_pcm_scope_get_callback_private | ( | snd_pcm_scope_t * | scope | ) |
Get callbacks private value for a SND_PCM_TYPE_METER PCM scope.
scope | PCM meter scope |
const char* snd_pcm_scope_get_name | ( | snd_pcm_scope_t * | scope | ) |
int snd_pcm_scope_malloc | ( | snd_pcm_scope_t ** | ptr | ) |
allocate an invalid snd_pcm_scope_t using standard malloc
ptr | returned pointer |
int16_t* snd_pcm_scope_s16_get_channel_buffer | ( | snd_pcm_scope_t * | scope, |
unsigned int | channel | ||
) |
Get s16 pseudo scope frames buffer for a channel.
scope | s16 pseudo scope handle |
channel | Channel |
int snd_pcm_scope_s16_open | ( | snd_pcm_t * | pcm, |
const char * | name, | ||
snd_pcm_scope_t ** | scopep | ||
) |
Add a s16 pseudo scope to a SND_PCM_TYPE_METER PCM.
pcm | The pcm handle |
name | Scope name |
scopep | Pointer to newly created and added scope |
s16 pseudo scope convert SND_PCM_TYPE_METER PCM frames in CPU endian 16 bit frames for use with other scopes. Don't forget to insert it before and to not insert it more time (see snd_pcm_meter_search_scope)
void snd_pcm_scope_set_callback_private | ( | snd_pcm_scope_t * | scope, |
void * | val | ||
) |
Get callbacks private value for a SND_PCM_TYPE_METER PCM scope.
scope | PCM meter scope |
val | Private data value |
void snd_pcm_scope_set_name | ( | snd_pcm_scope_t * | scope, |
const char * | val | ||
) |
Set name of a SND_PCM_TYPE_METER PCM scope.
scope | PCM meter scope |
val | scope name |
void snd_pcm_scope_set_ops | ( | snd_pcm_scope_t * | scope, |
const snd_pcm_scope_ops_t * | val | ||
) |
Set callbacks for a SND_PCM_TYPE_METER PCM scope.
scope | PCM meter scope |
val | callbacks |