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* \file <alsa/pcm_ordinary.h>
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* \brief Application interface library for the ALSA driver
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* \author Jaroslav Kysela <perex@suse.cz>
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* Application interface library for the ALSA driver.
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* See the \ref pcm_ordinary page for more details.
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifndef __ALSA_PCM_ORDINARY_H
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#define __ALSA_PCM_ORDINARY_H
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#include <alsa/asoundlib.h>
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/** Ordinary PCM latency type */
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enum sndo_pcm_latency_type {
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/** normal latency - for standard playback or capture
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(estimated latency in one direction 350ms) (default) */
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SNDO_PCM_LATENCY_NORMAL = 0,
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/** medium latency - software phones etc.
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(estimated latency in one direction maximally 50ms) */
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SNDO_PCM_LATENCY_MEDIUM,
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/** realtime latency - realtime applications (effect processors etc.)
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(estimated latency in one direction 5ms) */
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SNDO_PCM_LATENCY_REALTIME
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/** Ordinary PCM access type */
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enum sndo_pcm_access_type {
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/** interleaved access - channels are interleaved without any gaps among samples (default) */
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SNDO_PCM_ACCESS_INTERLEAVED = 0,
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/** noninterleaved access - channels are separate without any gaps among samples */
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SNDO_PCM_ACCESS_NONINTERLEAVED
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/** Ordinary PCM xrun type */
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enum sndo_pcm_xrun_type {
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/** driver / library will ignore all xruns, the stream runs forever (default) */
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SNDO_PCM_XRUN_IGNORE = 0,
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/** driver / library stops the stream when an xrun occurs */
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typedef struct sndo_pcm sndo_pcm_t;
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typedef int (sndo_pcm_engine_callback_t)(sndo_pcm_t *pcm);
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* \defgroup PCM_ordinary PCM Ordinary Interface
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* See the \ref pcm_ordinary page for more details.
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int sndo_pcm_open(sndo_pcm_t **pcm, const char *playback_name, const char *capture_name, struct alisp_cfg *lconf);
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int sndo_pcm_close(sndo_pcm_t *pcm);
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int sndo_pcm_poll_descriptors_count(sndo_pcm_t *pcm);
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int sndo_pcm_poll_descriptors(sndo_pcm_t *pcm, struct pollfd *pfds, unsigned int space);
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int sndo_pcm_start(sndo_pcm_t *pcm);
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int sndo_pcm_drop(sndo_pcm_t *pcm);
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int sndo_pcm_drain(sndo_pcm_t *pcm);
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int sndo_pcm_delay(sndo_pcm_t *pcm, snd_pcm_sframes_t *delayp);
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int sndo_pcm_transfer_block(sndo_pcm_t *pcm, snd_pcm_uframes_t *tblock);
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int sndo_pcm_resume(sndo_pcm_t *pcm);
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int sndo_pcm_wait(sndo_pcm_t *pcm, int timeout);
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snd_pcm_t *sndo_pcm_raw_playback(sndo_pcm_t *pcm);
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snd_pcm_t *sndo_pcm_raw_capture(sndo_pcm_t *pcm);
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* \defgroup PCM_ordinary_params Parameters Functions
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* \ingroup PCM_ordinary
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* See the \ref pcm_ordinary page for more details.
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int sndo_pcm_param_reset(sndo_pcm_t *pcm);
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int sndo_pcm_param_access(sndo_pcm_t *pcm, enum sndo_pcm_access_type access);
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int sndo_pcm_param_rate(sndo_pcm_t *pcm, unsigned int rate, unsigned int *used_rate);
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int sndo_pcm_param_channels(sndo_pcm_t *pcm, unsigned int channels);
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int sndo_pcm_param_format(sndo_pcm_t *pcm, snd_pcm_format_t format, snd_pcm_subformat_t subformat);
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int sndo_pcm_param_latency(sndo_pcm_t *pcm, enum sndo_pcm_latency_type latency, snd_pcm_uframes_t *used_latency);
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int sndo_pcm_param_xrun(sndo_pcm_t *pcm, enum sndo_pcm_xrun_type xrun);
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* \defgroup PCM_ordinary_access Ring Buffer I/O Functions
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* \ingroup PCM_ordinary
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* See the \ref pcm_ordinary page for more details.
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int sndo_pcm_pio_ibegin(sndo_pcm_t *pcm, void **ring_buffer, snd_pcm_uframes_t *frames);
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snd_pcm_sframes_t sndo_pcm_pio_iend(sndo_pcm_t *pcm, snd_pcm_uframes_t frames);
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int sndo_pcm_pio_nbegin(sndo_pcm_t *pcm, void ***ring_buffer, snd_pcm_uframes_t *frames);
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snd_pcm_sframes_t sndo_pcm_pio_nend(sndo_pcm_t *pcm, snd_pcm_uframes_t frames);
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int sndo_pcm_cio_ibegin(sndo_pcm_t *pcm, void **ring_buffer, snd_pcm_uframes_t *frames);
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snd_pcm_sframes_t sndo_pcm_cio_iend(sndo_pcm_t *pcm, snd_pcm_uframes_t frames);
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int sndo_pcm_cio_nbegin(sndo_pcm_t *pcm, void ***ring_buffer, snd_pcm_uframes_t *frames);
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snd_pcm_sframes_t sndo_pcm_cio_nend(sndo_pcm_t *pcm, snd_pcm_uframes_t frames);
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* \defgroup PCM_ordinary_engine Callback like engine
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* \ingroup PCM_ordinary
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* See the \ref pcm_ordinary page for more details.
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int sndo_pcm_set_private_data(sndo_pcm_t *pcm, void *private_data);
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int sndo_pcm_get_private_data(sndo_pcm_t *pcm, void **private_data);
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int sndo_pcm_engine(sndo_pcm_t *pcm,
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sndo_pcm_engine_callback_t *playback,
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sndo_pcm_engine_callback_t *capture);
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#endif /* __ALSA_PCM_ORDINARY_H */