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/* asoundlib.h
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * Neither the name of The Android Open Source Project nor the names of
** its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/
#ifndef ASOUNDLIB_H
#define ASOUNDLIB_H
/*
* PCM API
*/
struct pcm;
#define PCM_OUT 0x00000000
#define PCM_IN 0x10000000
/* Bit formats */
enum pcm_format {
PCM_FORMAT_S16_LE = 0,
PCM_FORMAT_S32_LE,
PCM_FORMAT_MAX,
};
/* Configuration for a stream */
struct pcm_config {
unsigned int channels;
unsigned int rate;
unsigned int period_size;
unsigned int period_count;
enum pcm_format format;
};
/* Mixer control types */
enum mixer_ctl_type {
MIXER_CTL_TYPE_BOOL,
MIXER_CTL_TYPE_INT,
MIXER_CTL_TYPE_ENUM,
MIXER_CTL_TYPE_BYTE,
MIXER_CTL_TYPE_IEC958,
MIXER_CTL_TYPE_INT64,
MIXER_CTL_TYPE_UNKNOWN,
MIXER_CTL_TYPE_MAX,
};
/* Open and close a stream */
struct pcm *pcm_open(unsigned int card, unsigned int device,
unsigned int flags, struct pcm_config *config);
int pcm_close(struct pcm *pcm);
int pcm_is_ready(struct pcm *pcm);
/* Set and get config */
int pcm_get_config(struct pcm *pcm, struct pcm_config *config);
int pcm_set_config(struct pcm *pcm, struct pcm_config *config);
/* Returns a human readable reason for the last error */
const char *pcm_get_error(struct pcm *pcm);
/* Returns the buffer size (int bytes) that should be used for pcm_write.
* This will be 1/2 of the actual fifo size.
*/
unsigned int pcm_get_buffer_size(struct pcm *pcm);
/* Returns the pcm latency in ms */
unsigned int pcm_get_latency(struct pcm *pcm);
/* Write data to the fifo.
* Will start playback on the first write or on a write that
* occurs after a fifo underrun.
*/
int pcm_write(struct pcm *pcm, void *data, unsigned int count);
int pcm_read(struct pcm *pcm, void *data, unsigned int count);
/* Start and stop a PCM channel that doesn't transfer data */
int pcm_start(struct pcm *pcm);
int pcm_stop(struct pcm *pcm);
/*
* MIXER API
*/
struct mixer;
struct mixer_ctl;
/* Open and close a mixer */
struct mixer *mixer_open(unsigned int card);
void mixer_close(struct mixer *mixer);
/* Obtain mixer controls */
unsigned int mixer_get_num_ctls(struct mixer *mixer);
struct mixer_ctl *mixer_get_ctl(struct mixer *mixer, unsigned int id);
struct mixer_ctl *mixer_get_ctl_by_name(struct mixer *mixer, const char *name);
/* Get info about mixer controls */
int mixer_ctl_get_name(struct mixer_ctl *ctl, char *name, unsigned int size);
enum mixer_ctl_type mixer_ctl_get_type(struct mixer_ctl *ctl);
const char *mixer_ctl_get_type_string(struct mixer_ctl *ctl);
unsigned int mixer_ctl_get_num_values(struct mixer_ctl *ctl);
unsigned int mixer_ctl_get_num_enums(struct mixer_ctl *ctl);
int mixer_ctl_get_enum_string(struct mixer_ctl *ctl, unsigned int enum_id,
char *string, unsigned int size);
/* Set and get mixer controls */
int mixer_ctl_get_percent(struct mixer_ctl *ctl, unsigned int id);
int mixer_ctl_set_percent(struct mixer_ctl *ctl, unsigned int id, int percent);
int mixer_ctl_get_value(struct mixer_ctl *ctl, unsigned int id);
int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value);
int mixer_ctl_set_enum_by_string(struct mixer_ctl *ctl, const char *string);
/* Determe range of integer mixer controls */
int mixer_ctl_get_range_min(struct mixer_ctl *ctl);
int mixer_ctl_get_range_max(struct mixer_ctl *ctl);
#endif
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