/builddir/build/BUILD/alsa-lib-1.0.18rc3/src/pcm/pcm.c File Reference

PCM Interface. More...


Functions

const char * snd_pcm_name (snd_pcm_t *pcm)
 get identifier of PCM handle
snd_pcm_type_t snd_pcm_type (snd_pcm_t *pcm)
 get type of PCM handle
snd_pcm_stream_t snd_pcm_stream (snd_pcm_t *pcm)
 get stream for a PCM handle
int snd_pcm_close (snd_pcm_t *pcm)
 close PCM handle
int snd_pcm_nonblock (snd_pcm_t *pcm, int nonblock)
 set nonblock mode
int snd_pcm_info (snd_pcm_t *pcm, snd_pcm_info_t *info)
 Obtain general (static) information for PCM handle.
int snd_pcm_hw_params_current (snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 Retreive current PCM hardware configuration chosen with snd_pcm_hw_params.
int snd_pcm_hw_params (snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 Install one PCM hardware configuration chosen from a configuration space and snd_pcm_prepare it.
int snd_pcm_hw_free (snd_pcm_t *pcm)
 Remove PCM hardware configuration and free associated resources.
int snd_pcm_sw_params (snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
 Install PCM software configuration defined by params.
int snd_pcm_status (snd_pcm_t *pcm, snd_pcm_status_t *status)
 Obtain status (runtime) information for PCM handle.
snd_pcm_state_t snd_pcm_state (snd_pcm_t *pcm)
 Return PCM state.
int snd_pcm_hwsync (snd_pcm_t *pcm)
 (DEPRECATED) Synchronize stream position with hardware
int snd_pcm_delay (snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
 Obtain delay for a running PCM handle.
int snd_pcm_resume (snd_pcm_t *pcm)
 Resume from suspend, no samples are lost.
int snd_pcm_htimestamp (snd_pcm_t *pcm, snd_pcm_uframes_t *avail, snd_htimestamp_t *tstamp)
 Obtain last position update hi-res timestamp.
int snd_pcm_prepare (snd_pcm_t *pcm)
 Prepare PCM for use.
int snd_pcm_reset (snd_pcm_t *pcm)
 Reset PCM position.
int snd_pcm_start (snd_pcm_t *pcm)
 Start a PCM.
int snd_pcm_drop (snd_pcm_t *pcm)
 Stop a PCM dropping pending frames.
int snd_pcm_drain (snd_pcm_t *pcm)
 Stop a PCM preserving pending frames.
int snd_pcm_pause (snd_pcm_t *pcm, int enable)
 Pause/resume PCM.
snd_pcm_sframes_t snd_pcm_rewindable (snd_pcm_t *pcm)
 Get safe count of frames which can be rewinded.
snd_pcm_sframes_t snd_pcm_rewind (snd_pcm_t *pcm, snd_pcm_uframes_t frames)
 Move application frame position backward.
snd_pcm_sframes_t snd_pcm_forwardable (snd_pcm_t *pcm)
 Get safe count of frames which can be forwarded.
snd_pcm_sframes_t snd_pcm_forward (snd_pcm_t *pcm, snd_pcm_uframes_t frames)
 Move application frame position forward.
snd_pcm_sframes_t snd_pcm_writei (snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
 Write interleaved frames to a PCM.
snd_pcm_sframes_t snd_pcm_writen (snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
 Write non interleaved frames to a PCM.
snd_pcm_sframes_t snd_pcm_readi (snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)
 Read interleaved frames from a PCM.
snd_pcm_sframes_t snd_pcm_readn (snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
 Read non interleaved frames to a PCM.
int snd_pcm_link (snd_pcm_t *pcm1, snd_pcm_t *pcm2)
 Link two PCMs.
int snd_pcm_unlink (snd_pcm_t *pcm)
 Remove a PCM from a linked group.
int snd_pcm_poll_descriptors_count (snd_pcm_t *pcm)
 get count of poll descriptors for PCM handle
int snd_pcm_poll_descriptors (snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space)
 get poll descriptors
int snd_pcm_poll_descriptors_revents (snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
 get returned events from poll descriptors
const char * snd_pcm_stream_name (snd_pcm_stream_t stream)
 get name of PCM stream type
const char * snd_pcm_access_name (snd_pcm_access_t acc)
 get name of PCM access type
const char * snd_pcm_format_name (snd_pcm_format_t format)
 get name of PCM sample format
const char * snd_pcm_format_description (snd_pcm_format_t format)
 get description of PCM sample format
snd_pcm_format_t snd_pcm_format_value (const char *name)
 get PCM sample format from name
const char * snd_pcm_subformat_name (snd_pcm_subformat_t subformat)
 get name of PCM sample subformat
const char * snd_pcm_subformat_description (snd_pcm_subformat_t subformat)
 get description of PCM sample subformat
const char * snd_pcm_start_mode_name (snd_pcm_start_t mode)
 (DEPRECATED) get name of PCM start mode setting
const char * snd_pcm_xrun_mode_name (snd_pcm_xrun_t mode)
 (DEPRECATED) get name of PCM xrun mode setting
const char * snd_pcm_tstamp_mode_name (snd_pcm_tstamp_t mode)
 get name of PCM tstamp mode setting
const char * snd_pcm_state_name (snd_pcm_state_t state)
 get name of PCM state
const char * snd_pcm_type_name (snd_pcm_type_t type)
 get name of PCM type
int snd_pcm_dump_hw_setup (snd_pcm_t *pcm, snd_output_t *out)
 Dump current hardware setup for PCM.
int snd_pcm_dump_sw_setup (snd_pcm_t *pcm, snd_output_t *out)
 Dump current software setup for PCM.
int snd_pcm_dump_setup (snd_pcm_t *pcm, snd_output_t *out)
 Dump current setup (hardware and software) for PCM.
int snd_pcm_status_dump (snd_pcm_status_t *status, snd_output_t *out)
 Dump status.
int snd_pcm_dump (snd_pcm_t *pcm, snd_output_t *out)
 Dump PCM info.
snd_pcm_sframes_t snd_pcm_bytes_to_frames (snd_pcm_t *pcm, ssize_t bytes)
 Convert bytes in frames for a PCM.
ssize_t snd_pcm_frames_to_bytes (snd_pcm_t *pcm, snd_pcm_sframes_t frames)
 Convert frames in bytes for a PCM.
long snd_pcm_bytes_to_samples (snd_pcm_t *pcm, ssize_t bytes)
 Convert bytes in samples for a PCM.
ssize_t snd_pcm_samples_to_bytes (snd_pcm_t *pcm, long samples)
 Convert samples in bytes for a PCM.
int snd_async_add_pcm_handler (snd_async_handler_t **handler, snd_pcm_t *pcm, snd_async_callback_t callback, void *private_data)
 Add an async handler for a PCM.
snd_pcm_tsnd_async_handler_get_pcm (snd_async_handler_t *handler)
 Return PCM handle related to an async handler.
int snd_pcm_open (snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode)
 Opens a PCM.
int snd_pcm_open_lconf (snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t stream, int mode, snd_config_t *lconf)
 Opens a PCM using local configuration.
int snd_pcm_wait (snd_pcm_t *pcm, int timeout)
 Wait for a PCM to become ready.
snd_pcm_sframes_t snd_pcm_avail_update (snd_pcm_t *pcm)
 Return number of frames ready to be read (capture) / written (playback).
snd_pcm_sframes_t snd_pcm_avail (snd_pcm_t *pcm)
 Return number of frames ready to be read (capture) / written (playback).
int snd_pcm_avail_delay (snd_pcm_t *pcm, snd_pcm_sframes_t *availp, snd_pcm_sframes_t *delayp)
 Combine snd_pcm_avail and snd_pcm_delay functions.
int snd_pcm_area_silence (const snd_pcm_channel_area_t *dst_area, snd_pcm_uframes_t dst_offset, unsigned int samples, snd_pcm_format_t format)
 Silence an area.
int snd_pcm_areas_silence (const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format)
 Silence one or more areas.
int snd_pcm_area_copy (const snd_pcm_channel_area_t *dst_area, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_area, snd_pcm_uframes_t src_offset, unsigned int samples, snd_pcm_format_t format)
 Copy an area.
int snd_pcm_areas_copy (const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset, const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset, unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format)
 Copy one or more areas.
int snd_pcm_hw_params_dump (snd_pcm_hw_params_t *params, snd_output_t *out)
 Dump a PCM hardware configuration space.
int snd_pcm_hw_params_can_mmap_sample_resolution (const snd_pcm_hw_params_t *params)
 Check, if hardware supports sample-resolution mmap for given configuration.
int snd_pcm_hw_params_is_double (const snd_pcm_hw_params_t *params)
 Check, if hardware does double buffering for start/stop for given configuration.
int snd_pcm_hw_params_is_batch (const snd_pcm_hw_params_t *params)
 Check, if hardware does double buffering for data transfers for given configuration.
int snd_pcm_hw_params_is_block_transfer (const snd_pcm_hw_params_t *params)
 Check, if hardware does block transfers for samples for given configuration.
int snd_pcm_hw_params_is_monotonic (const snd_pcm_hw_params_t *params)
 Check, if timestamps are monotonic for given configuration.
int snd_pcm_hw_params_can_overrange (const snd_pcm_hw_params_t *params)
 Check, if hardware supports overrange detection.
int snd_pcm_hw_params_can_pause (const snd_pcm_hw_params_t *params)
 Check, if hardware supports pause.
int snd_pcm_hw_params_can_resume (const snd_pcm_hw_params_t *params)
 Check, if hardware supports resume.
int snd_pcm_hw_params_is_half_duplex (const snd_pcm_hw_params_t *params)
 Check, if hardware does half-duplex only.
int snd_pcm_hw_params_is_joint_duplex (const snd_pcm_hw_params_t *params)
 Check, if hardware does joint-duplex (playback and capture are somewhat correlated).
int snd_pcm_hw_params_can_sync_start (const snd_pcm_hw_params_t *params)
 Check, if hardware supports synchronized start with sample resolution.
int snd_pcm_hw_params_get_rate_numden (const snd_pcm_hw_params_t *params, unsigned int *rate_num, unsigned int *rate_den)
 Get rate exact info from a configuration space.
int snd_pcm_hw_params_get_sbits (const snd_pcm_hw_params_t *params)
 Get sample resolution info from a configuration space.
int snd_pcm_hw_params_get_fifo_size (const snd_pcm_hw_params_t *params)
 Get hard are FIFO size info from a configuration space.
int snd_pcm_hw_params_any (snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 Fill params with a full configuration space for a PCM.
size_t snd_pcm_access_mask_sizeof ()
 get size of snd_pcm_access_mask_t
int snd_pcm_access_mask_malloc (snd_pcm_access_mask_t **ptr)
 allocate an empty snd_pcm_access_mask_t using standard malloc
void snd_pcm_access_mask_free (snd_pcm_access_mask_t *obj)
 frees a previously allocated snd_pcm_access_mask_t
void snd_pcm_access_mask_copy (snd_pcm_access_mask_t *dst, const snd_pcm_access_mask_t *src)
 copy one snd_pcm_access_mask_t to another
void snd_pcm_access_mask_none (snd_pcm_access_mask_t *mask)
 reset all bits in a snd_pcm_access_mask_t
void snd_pcm_access_mask_any (snd_pcm_access_mask_t *mask)
 set all bits in a snd_pcm_access_mask_t
int snd_pcm_access_mask_test (const snd_pcm_access_mask_t *mask, snd_pcm_access_t val)
 test the presence of an access type in a snd_pcm_access_mask_t
int snd_pcm_access_mask_empty (const snd_pcm_access_mask_t *mask)
 test, if given a snd_pcm_access_mask_t is empty
void snd_pcm_access_mask_set (snd_pcm_access_mask_t *mask, snd_pcm_access_t val)
 make an access type present in a snd_pcm_access_mask_t
void snd_pcm_access_mask_reset (snd_pcm_access_mask_t *mask, snd_pcm_access_t val)
 make an access type missing from a snd_pcm_access_mask_t
size_t snd_pcm_format_mask_sizeof ()
 get size of snd_pcm_format_mask_t
int snd_pcm_format_mask_malloc (snd_pcm_format_mask_t **ptr)
 allocate an empty snd_pcm_format_mask_t using standard malloc
void snd_pcm_format_mask_free (snd_pcm_format_mask_t *obj)
 frees a previously allocated snd_pcm_format_mask_t
void snd_pcm_format_mask_copy (snd_pcm_format_mask_t *dst, const snd_pcm_format_mask_t *src)
 copy one snd_pcm_format_mask_t to another
void snd_pcm_format_mask_none (snd_pcm_format_mask_t *mask)
 reset all bits in a snd_pcm_format_mask_t
void snd_pcm_format_mask_any (snd_pcm_format_mask_t *mask)
 set all bits in a snd_pcm_format_mask_t
int snd_pcm_format_mask_test (const snd_pcm_format_mask_t *mask, snd_pcm_format_t val)
 test the presence of a format in a snd_pcm_format_mask_t
int snd_pcm_format_mask_empty (const snd_pcm_format_mask_t *mask)
 test, if given a snd_pcm_format_mask_t is empty
void snd_pcm_format_mask_set (snd_pcm_format_mask_t *mask, snd_pcm_format_t val)
 make a format present in a snd_pcm_format_mask_t
void snd_pcm_format_mask_reset (snd_pcm_format_mask_t *mask, snd_pcm_format_t val)
 make a format missing from a snd_pcm_format_mask_t
size_t snd_pcm_subformat_mask_sizeof ()
 get size of snd_pcm_subformat_mask_t
int snd_pcm_subformat_mask_malloc (snd_pcm_subformat_mask_t **ptr)
 allocate an empty snd_pcm_subformat_mask_t using standard malloc
void snd_pcm_subformat_mask_free (snd_pcm_subformat_mask_t *obj)
 frees a previously allocated snd_pcm_subformat_mask_t
void snd_pcm_subformat_mask_copy (snd_pcm_subformat_mask_t *dst, const snd_pcm_subformat_mask_t *src)
 copy one snd_pcm_subformat_mask_t to another
void snd_pcm_subformat_mask_none (snd_pcm_subformat_mask_t *mask)
 reset all bits in a snd_pcm_subformat_mask_t
void snd_pcm_subformat_mask_any (snd_pcm_subformat_mask_t *mask)
 set all bits in a snd_pcm_subformat_mask_t
int snd_pcm_subformat_mask_test (const snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val)
 test the presence of a subformat in a snd_pcm_subformat_mask_t
int snd_pcm_subformat_mask_empty (const snd_pcm_subformat_mask_t *mask)
 test, if given a snd_pcm_subformat_mask_t is empty
void snd_pcm_subformat_mask_set (snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val)
 make a subformat present in a snd_pcm_subformat_mask_t
void snd_pcm_subformat_mask_reset (snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val)
 make a subformat missing from a snd_pcm_subformat_mask_t
size_t snd_pcm_hw_params_sizeof ()
 get size of snd_pcm_hw_params_t
int snd_pcm_hw_params_malloc (snd_pcm_hw_params_t **ptr)
 allocate an invalid snd_pcm_hw_params_t using standard malloc
void snd_pcm_hw_params_free (snd_pcm_hw_params_t *obj)
 frees a previously allocated snd_pcm_hw_params_t
void snd_pcm_hw_params_copy (snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src)
 copy one snd_pcm_hw_params_t to another
int snd_pcm_hw_params_get_access (const snd_pcm_hw_params_t *params, snd_pcm_access_t *access)
 Extract access type from a configuration space.
int snd_pcm_hw_params_test_access (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access)
 Verify if an access type is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_access (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access)
 Restrict a configuration space to contain only one access type.
int snd_pcm_hw_params_set_access_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t *access)
 Restrict a configuration space to contain only its first access type.
int snd_pcm_hw_params_set_access_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t *access)
 Restrict a configuration space to contain only its last access type.
int snd_pcm_hw_params_set_access_mask (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_mask_t *mask)
 Restrict a configuration space to contain only a set of access types.
int snd_pcm_hw_params_get_access_mask (snd_pcm_hw_params_t *params, snd_pcm_access_mask_t *mask)
 Get access mask from a configuration space.
int snd_pcm_hw_params_get_format (const snd_pcm_hw_params_t *params, snd_pcm_format_t *format)
 Extract format from a configuration space.
int snd_pcm_hw_params_test_format (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t format)
 Verify if a format is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_format (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t format)
 Restrict a configuration space to contain only one format.
int snd_pcm_hw_params_set_format_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t *format)
 Restrict a configuration space to contain only its first format.
int snd_pcm_hw_params_set_format_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t *format)
 Restrict a configuration space to contain only its last format.
int snd_pcm_hw_params_set_format_mask (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_mask_t *mask)
 Restrict a configuration space to contain only a set of formats.
void snd_pcm_hw_params_get_format_mask (snd_pcm_hw_params_t *params, snd_pcm_format_mask_t *mask)
 Get format mask from a configuration space.
int snd_pcm_hw_params_get_subformat (const snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat)
 Extract subformat from a configuration space.
int snd_pcm_hw_params_test_subformat (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t subformat)
 Verify if a subformat is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_subformat (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t subformat)
 Restrict a configuration space to contain only one subformat.
int snd_pcm_hw_params_set_subformat_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat)
 Restrict a configuration space to contain only its first subformat.
int snd_pcm_hw_params_set_subformat_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat)
 Restrict a configuration space to contain only its last subformat.
int snd_pcm_hw_params_set_subformat_mask (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_mask_t *mask)
 Restrict a configuration space to contain only a set of subformats.
void snd_pcm_hw_params_get_subformat_mask (snd_pcm_hw_params_t *params, snd_pcm_subformat_mask_t *mask)
 Get subformat mask from a configuration space.
int snd_pcm_hw_params_get_channels (const snd_pcm_hw_params_t *params, unsigned int *val)
 Extract channels from a configuration space.
int snd_pcm_hw_params_get_channels_min (const snd_pcm_hw_params_t *params, unsigned int *val)
 Extract minimum channels count from a configuration space.
int snd_pcm_hw_params_get_channels_max (const snd_pcm_hw_params_t *params, unsigned int *val)
 Extract maximum channels count from a configuration space.
int snd_pcm_hw_params_test_channels (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)
 Verify if a channels count is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_channels (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)
 Restrict a configuration space to contain only one channels count.
int snd_pcm_hw_params_set_channels_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Restrict a configuration space with a minimum channels count.
int snd_pcm_hw_params_set_channels_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Restrict a configuration space with a maximum channels count.
int snd_pcm_hw_params_set_channels_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, unsigned int *max)
 Restrict a configuration space to have channels counts in a given range.
int snd_pcm_hw_params_set_channels_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Restrict a configuration space to have channels count nearest to a target.
int snd_pcm_hw_params_set_channels_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Restrict a configuration space to contain only its minimum channels count.
int snd_pcm_hw_params_set_channels_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Restrict a configuration space to contain only its maximum channels count.
int snd_pcm_hw_params_get_rate (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract rate from a configuration space.
int snd_pcm_hw_params_get_rate_min (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract minimum rate from a configuration space.
int snd_pcm_hw_params_get_rate_max (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract maximum rate from a configuration space.
int snd_pcm_hw_params_test_rate (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Verify if a rate is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_rate (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Restrict a configuration space to contain only one rate.
int snd_pcm_hw_params_set_rate_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a minimum rate.
int snd_pcm_hw_params_set_rate_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a maximum rate.
int snd_pcm_hw_params_set_rate_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, int *mindir, unsigned int *max, int *maxdir)
 Restrict a configuration space to have rates in a given range.
int snd_pcm_hw_params_set_rate_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to have rate nearest to a target.
int snd_pcm_hw_params_set_rate_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its minimum rate.
int snd_pcm_hw_params_set_rate_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its maximum rate.
int snd_pcm_hw_params_set_rate_resample (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)
 Restrict a configuration space to contain only real hardware rates.
int snd_pcm_hw_params_get_rate_resample (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Extract resample state from a configuration space.
int snd_pcm_hw_params_set_export_buffer (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val)
 Restrict a configuration space to allow the buffer accessible from outside.
int snd_pcm_hw_params_get_export_buffer (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val)
 Extract buffer accessibility from a configuration space.
int snd_pcm_hw_params_get_period_time (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract period time from a configuration space.
int snd_pcm_hw_params_get_period_time_min (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract minimum period time from a configuration space.
int snd_pcm_hw_params_get_period_time_max (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract maximum period time from a configuration space.
int snd_pcm_hw_params_test_period_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Verify if a period time is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_period_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Restrict a configuration space to contain only one period time.
int snd_pcm_hw_params_set_period_time_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a minimum period time.
int snd_pcm_hw_params_set_period_time_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a maximum period time.
int snd_pcm_hw_params_set_period_time_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, int *mindir, unsigned int *max, int *maxdir)
 Restrict a configuration space to have period times in a given range.
int snd_pcm_hw_params_set_period_time_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to have period time nearest to a target.
int snd_pcm_hw_params_set_period_time_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its minimum period time.
int snd_pcm_hw_params_set_period_time_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its maximum period time.
int snd_pcm_hw_params_get_period_size (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Extract period size from a configuration space.
int snd_pcm_hw_params_get_period_size_min (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Extract minimum period size from a configuration space.
int snd_pcm_hw_params_get_period_size_max (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Extract maximum period size from a configuration space.
int snd_pcm_hw_params_test_period_size (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int dir)
 Verify if a period size is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_period_size (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int dir)
 Restrict a configuration space to contain only one period size.
int snd_pcm_hw_params_set_period_size_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Restrict a configuration space with a minimum period size.
int snd_pcm_hw_params_set_period_size_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Restrict a configuration space with a maximum period size.
int snd_pcm_hw_params_set_period_size_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *min, int *mindir, snd_pcm_uframes_t *max, int *maxdir)
 Restrict a configuration space to have period sizes in a given range.
int snd_pcm_hw_params_set_period_size_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Restrict a configuration space to have period size nearest to a target.
int snd_pcm_hw_params_set_period_size_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Restrict a configuration space to contain only its minimum period size.
int snd_pcm_hw_params_set_period_size_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir)
 Restrict a configuration space to contain only its maximum period size.
int snd_pcm_hw_params_set_period_size_integer (snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 Restrict a configuration space to contain only integer period sizes.
int snd_pcm_hw_params_get_periods (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract periods from a configuration space.
int snd_pcm_hw_params_get_periods_min (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract minimum periods count from a configuration space.
int snd_pcm_hw_params_get_periods_max (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract maximum periods count from a configuration space.
int snd_pcm_hw_params_test_periods (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Verify if a periods count is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_periods (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Restrict a configuration space to contain only one periods count.
int snd_pcm_hw_params_set_periods_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a minimum periods count.
int snd_pcm_hw_params_set_periods_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a maximum periods count.
int snd_pcm_hw_params_set_periods_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, int *mindir, unsigned int *max, int *maxdir)
 Restrict a configuration space to have periods counts in a given range.
int snd_pcm_hw_params_set_periods_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to have periods count nearest to a target.
int snd_pcm_hw_params_set_periods_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its minimum periods count.
int snd_pcm_hw_params_set_periods_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its maximum periods count.
int snd_pcm_hw_params_set_periods_integer (snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 Restrict a configuration space to contain only integer periods counts.
int snd_pcm_hw_params_get_buffer_time (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract buffer time from a configuration space.
int snd_pcm_hw_params_get_buffer_time_min (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract minimum buffer time from a configuration space.
int snd_pcm_hw_params_get_buffer_time_max (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Extract maximum buffer time from a configuration space.
int snd_pcm_hw_params_test_buffer_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Verify if a buffer time is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_buffer_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 Restrict a configuration space to contain only one buffer time.
int snd_pcm_hw_params_set_buffer_time_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a minimum buffer time.
int snd_pcm_hw_params_set_buffer_time_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space with a maximum buffer time.
int snd_pcm_hw_params_set_buffer_time_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, int *mindir, unsigned int *max, int *maxdir)
 Restrict a configuration space to have buffer times in a given range.
int snd_pcm_hw_params_set_buffer_time_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to have buffer time nearest to a target.
int snd_pcm_hw_params_set_buffer_time_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its minimum buffer time.
int snd_pcm_hw_params_set_buffer_time_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 Restrict a configuration space to contain only its maximum buffered time.
int snd_pcm_hw_params_get_buffer_size (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Extract buffer size from a configuration space.
int snd_pcm_hw_params_get_buffer_size_min (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Extract minimum buffer size from a configuration space.
int snd_pcm_hw_params_get_buffer_size_max (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Extract maximum buffer size from a configuration space.
int snd_pcm_hw_params_test_buffer_size (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val)
 Verify if a buffer size is available inside a configuration space for a PCM.
int snd_pcm_hw_params_set_buffer_size (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val)
 Restrict a configuration space to contain only one buffer size.
int snd_pcm_hw_params_set_buffer_size_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Restrict a configuration space with a minimum buffer size.
int snd_pcm_hw_params_set_buffer_size_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Restrict a configuration space with a maximum buffer size.
int snd_pcm_hw_params_set_buffer_size_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *min, snd_pcm_uframes_t *max)
 Restrict a configuration space to have buffer sizes in a given range.
int snd_pcm_hw_params_set_buffer_size_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Restrict a configuration space to have buffer size nearest to a target.
int snd_pcm_hw_params_set_buffer_size_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Restrict a configuration space to contain only its minimum buffer size.
int snd_pcm_hw_params_set_buffer_size_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Restrict a configuration space to contain only its maximum buffer size.
int snd_pcm_hw_params_get_tick_time (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Extract tick time from a configuration space
int snd_pcm_hw_params_get_tick_time_min (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Extract minimum tick time from a configuration space
int snd_pcm_hw_params_get_tick_time_max (const snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Extract maximum tick time from a configuration space
int snd_pcm_hw_params_test_tick_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 (DEPRECATED) Verify if a tick time is available inside a configuration space for a PCM
int snd_pcm_hw_params_set_tick_time (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir)
 (DEPRECATED) Restrict a configuration space to contain only one tick time
int snd_pcm_hw_params_set_tick_time_min (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Restrict a configuration space with a minimum tick time
int snd_pcm_hw_params_set_tick_time_max (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Restrict a configuration space with a maximum tick time
int snd_pcm_hw_params_set_tick_time_minmax (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, int *mindir, unsigned int *max, int *maxdir)
 (DEPRECATED) Restrict a configuration space to have tick times in a given range
int snd_pcm_hw_params_set_tick_time_near (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Restrict a configuration space to have tick time nearest to a target
int snd_pcm_hw_params_set_tick_time_first (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Restrict a configuration space to contain only its minimum tick time
int snd_pcm_hw_params_set_tick_time_last (snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir)
 (DEPRECATED) Restrict a configuration space to contain only its maximum tick time
int snd_pcm_hw_params_get_min_align (const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val)
 Get the minimum transfer align value in samples.
int snd_pcm_sw_params_current (snd_pcm_t *pcm, snd_pcm_sw_params_t *params)
 Return current software configuration for a PCM.
int snd_pcm_sw_params_dump (snd_pcm_sw_params_t *params, snd_output_t *out)
 Dump a software configuration.
size_t snd_pcm_sw_params_sizeof ()
 get size of snd_pcm_sw_params_t
int snd_pcm_sw_params_malloc (snd_pcm_sw_params_t **ptr)
 allocate an invalid snd_pcm_sw_params_t using standard malloc
void snd_pcm_sw_params_free (snd_pcm_sw_params_t *obj)
 frees a previously allocated snd_pcm_sw_params_t
void snd_pcm_sw_params_copy (snd_pcm_sw_params_t *dst, const snd_pcm_sw_params_t *src)
 copy one snd_pcm_sw_params_t to another
int snd_pcm_sw_params_get_boundary (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get boundary for ring pointers from a software configuration container.
int snd_pcm_sw_params_set_start_mode (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_start_t val)
 (DEPRECATED) Set start mode inside a software configuration container
snd_pcm_start_t snd_pcm_sw_params_get_start_mode (const snd_pcm_sw_params_t *params)
 (DEPRECATED) Get start mode from a software configuration container
int snd_pcm_sw_params_set_xrun_mode (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_xrun_t val)
 (DEPRECATED) Set xrun mode inside a software configuration container
snd_pcm_xrun_t snd_pcm_sw_params_get_xrun_mode (const snd_pcm_sw_params_t *params)
 (DEPRECATED) Get xrun mode from a software configuration container
int snd_pcm_sw_params_set_tstamp_mode (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_tstamp_t val)
 Set timestamp mode inside a software configuration container.
int snd_pcm_sw_params_get_tstamp_mode (const snd_pcm_sw_params_t *params, snd_pcm_tstamp_t *val)
 Get timestamp mode from a software configuration container.
int snd_pcm_sw_params_set_sleep_min (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, unsigned int val)
 (DEPRECATED) Set minimum number of ticks to sleep inside a software configuration container
int snd_pcm_sw_params_get_sleep_min (const snd_pcm_sw_params_t *params, unsigned int *val)
 (DEPRECATED) Get minimum numbers of ticks to sleep from a software configuration container
int snd_pcm_sw_params_set_avail_min (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 Set avail min inside a software configuration container.
int snd_pcm_sw_params_get_avail_min (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get avail min from a software configuration container.
int snd_pcm_sw_params_set_period_event (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, int val)
 Set period event inside a software configuration container.
int snd_pcm_sw_params_get_period_event (const snd_pcm_sw_params_t *params, int *val)
 Get period event from a software configuration container.
int snd_pcm_sw_params_set_xfer_align (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 (DEPRECATED) Set xfer align inside a software configuration container
int snd_pcm_sw_params_get_xfer_align (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 (DEPRECATED) Get xfer align from a software configuration container
int snd_pcm_sw_params_set_start_threshold (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 Set start threshold inside a software configuration container.
int snd_pcm_sw_params_get_start_threshold (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get start threshold from a software configuration container.
int snd_pcm_sw_params_set_stop_threshold (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 Set stop threshold inside a software configuration container.
int snd_pcm_sw_params_get_stop_threshold (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get stop threshold from a software configuration container.
int snd_pcm_sw_params_set_silence_threshold (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 Set silence threshold inside a software configuration container.
int snd_pcm_sw_params_get_silence_threshold (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get silence threshold from a software configuration container.
int snd_pcm_sw_params_set_silence_size (snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val)
 Set silence size inside a software configuration container.
int snd_pcm_sw_params_get_silence_size (const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val)
 Get silence size from a software configuration container.
size_t snd_pcm_status_sizeof ()
 get size of snd_pcm_status_t
int snd_pcm_status_malloc (snd_pcm_status_t **ptr)
 allocate an invalid snd_pcm_status_t using standard malloc
void snd_pcm_status_free (snd_pcm_status_t *obj)
 frees a previously allocated snd_pcm_status_t
void snd_pcm_status_copy (snd_pcm_status_t *dst, const snd_pcm_status_t *src)
 copy one snd_pcm_status_t to another
snd_pcm_state_t snd_pcm_status_get_state (const snd_pcm_status_t *obj)
 Get state from a PCM status container (see snd_pcm_state).
void snd_pcm_status_get_trigger_tstamp (const snd_pcm_status_t *obj, snd_timestamp_t *ptr)
 Get trigger timestamp from a PCM status container.
void snd_pcm_status_get_trigger_htstamp (const snd_pcm_status_t *obj, snd_htimestamp_t *ptr)
 Get trigger hi-res timestamp from a PCM status container.
void snd_pcm_status_get_tstamp (const snd_pcm_status_t *obj, snd_timestamp_t *ptr)
 Get "now" timestamp from a PCM status container.
void snd_pcm_status_get_htstamp (const snd_pcm_status_t *obj, snd_htimestamp_t *ptr)
 Get "now" hi-res timestamp from a PCM status container.
snd_pcm_sframes_t snd_pcm_status_get_delay (const snd_pcm_status_t *obj)
 Get delay from a PCM status container (see snd_pcm_delay).
snd_pcm_uframes_t snd_pcm_status_get_avail (const snd_pcm_status_t *obj)
 Get number of frames available from a PCM status container (see snd_pcm_avail_update).
snd_pcm_uframes_t snd_pcm_status_get_avail_max (const snd_pcm_status_t *obj)
 Get maximum number of frames available from a PCM status container after last snd_pcm_status call.
snd_pcm_uframes_t snd_pcm_status_get_overrange (const snd_pcm_status_t *obj)
 Get count of ADC overrange detections since last call.
size_t snd_pcm_info_sizeof ()
 get size of snd_pcm_info_t
int snd_pcm_info_malloc (snd_pcm_info_t **ptr)
 allocate an invalid snd_pcm_info_t using standard malloc
void snd_pcm_info_free (snd_pcm_info_t *obj)
 frees a previously allocated snd_pcm_info_t
void snd_pcm_info_copy (snd_pcm_info_t *dst, const snd_pcm_info_t *src)
 copy one snd_pcm_info_t to another
unsigned int snd_pcm_info_get_device (const snd_pcm_info_t *obj)
 Get device from a PCM info container.
unsigned int snd_pcm_info_get_subdevice (const snd_pcm_info_t *obj)
 Get subdevice from a PCM info container.
snd_pcm_stream_t snd_pcm_info_get_stream (const snd_pcm_info_t *obj)
 Get stream (direction) from a PCM info container.
int snd_pcm_info_get_card (const snd_pcm_info_t *obj)
 Get card from a PCM info container.
const char * snd_pcm_info_get_id (const snd_pcm_info_t *obj)
 Get id from a PCM info container.
const char * snd_pcm_info_get_name (const snd_pcm_info_t *obj)
 Get name from a PCM info container.
const char * snd_pcm_info_get_subdevice_name (const snd_pcm_info_t *obj)
 Get subdevice name from a PCM info container.
snd_pcm_class_t snd_pcm_info_get_class (const snd_pcm_info_t *obj)
 Get class from a PCM info container.
snd_pcm_subclass_t snd_pcm_info_get_subclass (const snd_pcm_info_t *obj)
 Get subclass from a PCM info container.
unsigned int snd_pcm_info_get_subdevices_count (const snd_pcm_info_t *obj)
 Get subdevices count from a PCM info container.
unsigned int snd_pcm_info_get_subdevices_avail (const snd_pcm_info_t *obj)
 Get available subdevices count from a PCM info container.
snd_pcm_sync_id_t snd_pcm_info_get_sync (const snd_pcm_info_t *obj)
 Get hardware synchronization ID from a PCM info container.
void snd_pcm_info_set_device (snd_pcm_info_t *obj, unsigned int val)
 Set wanted device inside a PCM info container (see snd_ctl_pcm_info).
void snd_pcm_info_set_subdevice (snd_pcm_info_t *obj, unsigned int val)
 Set wanted subdevice inside a PCM info container (see snd_ctl_pcm_info).
void snd_pcm_info_set_stream (snd_pcm_info_t *obj, snd_pcm_stream_t val)
 Set wanted stream inside a PCM info container (see snd_ctl_pcm_info).
int snd_pcm_mmap_begin (snd_pcm_t *pcm, const snd_pcm_channel_area_t **areas, snd_pcm_uframes_t *offset, snd_pcm_uframes_t *frames)
 Application request to access a portion of direct (mmap) area.
snd_pcm_sframes_t snd_pcm_mmap_commit (snd_pcm_t *pcm, snd_pcm_uframes_t offset, snd_pcm_uframes_t frames)
 Application has completed the access to area requested with snd_pcm_mmap_begin.
int snd_pcm_recover (snd_pcm_t *pcm, int err, int silent)
 Recover the stream state from an error or suspend.
int snd_pcm_set_params (snd_pcm_t *pcm, snd_pcm_format_t format, snd_pcm_access_t access, unsigned int channels, unsigned int rate, int soft_resample, unsigned int latency)
 Set the hardware and software parameters in a simple way.
int snd_pcm_get_params (snd_pcm_t *pcm, snd_pcm_uframes_t *buffer_size, snd_pcm_uframes_t *period_size)
 Get the transfer size parameters in a simple way.


Detailed Description

PCM Interface.

Author:
Jaroslav Kysela <perex@perex.cz>

Abramo Bagnara <abramo@alsa-project.org>

Date:
2000-2001
PCM Interface is designed to write or read digital audio frames. A frame is the data unit converted into/from sound in one time unit (1/rate seconds), by example if you set your playback PCM rate to 44100 you'll hear 44100 frames per second. The size in bytes of a frame may be obtained from bits needed to store a sample and channels count.

See the PCM (digital audio) interface page for more details.


Function Documentation

snd_pcm_sframes_t snd_pcm_avail ( snd_pcm_t pcm  ) 

Return number of frames ready to be read (capture) / written (playback).

Parameters:
pcm PCM handle
Returns:
a positive number of frames ready otherwise a negative error code
On capture does all the actions needed to transport to application level all the ready frames across underlying layers.

The position is synced with hardware (driver) position in the sound ring buffer in this functions.

int snd_pcm_avail_delay ( snd_pcm_t pcm,
snd_pcm_sframes_t availp,
snd_pcm_sframes_t delayp 
)

Combine snd_pcm_avail and snd_pcm_delay functions.

Parameters:
pcm PCM handle
avail Number of available frames in the ring buffer
delay Total I/O latency in frames
Returns:
zero on success otherwise a negative error code
The avail and delay values retuned are in sync.


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