274 lines
9.8 KiB
C
274 lines
9.8 KiB
C
|
/* 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
|
||
|
|
|
||
|
|
#include <sys/time.h>
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
#if defined(__cplusplus)
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* PCM API
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct pcm;
|
||
|
|
|
||
|
|
#define PCM_OUT 0x00000000
|
||
|
|
#define PCM_IN 0x10000000
|
||
|
|
#define PCM_MMAP 0x00000001
|
||
|
|
#define PCM_NOIRQ 0x00000002
|
||
|
|
#define PCM_NORESTART 0x00000004 /* PCM_NORESTART - when set, calls to
|
||
|
|
* pcm_write for a playback stream will not
|
||
|
|
* attempt to restart the stream in the case
|
||
|
|
* of an underflow, but will return -EPIPE
|
||
|
|
* instead. After the first -EPIPE error, the
|
||
|
|
* stream is considered to be stopped, and a
|
||
|
|
* second call to pcm_write will attempt to
|
||
|
|
* restart the stream.
|
||
|
|
*/
|
||
|
|
#define PCM_MONOTONIC 0x00000008 /* see pcm_get_htimestamp */
|
||
|
|
|
||
|
|
/* PCM runtime states */
|
||
|
|
#define PCM_STATE_OPEN 0
|
||
|
|
#define PCM_STATE_SETUP 1
|
||
|
|
#define PCM_STATE_PREPARED 2
|
||
|
|
#define PCM_STATE_RUNNING 3
|
||
|
|
#define PCM_STATE_XRUN 4
|
||
|
|
#define PCM_STATE_DRAINING 5
|
||
|
|
#define PCM_STATE_PAUSED 6
|
||
|
|
#define PCM_STATE_SUSPENDED 7
|
||
|
|
#define PCM_STATE_DISCONNECTED 8
|
||
|
|
|
||
|
|
/* Bit formats */
|
||
|
|
enum pcm_format {
|
||
|
|
PCM_FORMAT_S16_LE = 0,
|
||
|
|
PCM_FORMAT_S32_LE,
|
||
|
|
PCM_FORMAT_S8,
|
||
|
|
PCM_FORMAT_S24_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;
|
||
|
|
|
||
|
|
/* Values to use for the ALSA start, stop and silence thresholds. Setting
|
||
|
|
* any one of these values to 0 will cause the default tinyalsa values to be
|
||
|
|
* used instead. Tinyalsa defaults are as follows.
|
||
|
|
*
|
||
|
|
* start_threshold : period_count * period_size
|
||
|
|
* stop_threshold : period_count * period_size
|
||
|
|
* silence_threshold : 0
|
||
|
|
*/
|
||
|
|
unsigned int start_threshold;
|
||
|
|
unsigned int stop_threshold;
|
||
|
|
unsigned int silence_threshold;
|
||
|
|
|
||
|
|
/* Minimum number of frames available before pcm_mmap_write() will actually
|
||
|
|
* write into the kernel buffer. Only used if the stream is opened in mmap mode
|
||
|
|
* (pcm_open() called with PCM_MMAP flag set). Use 0 for default.
|
||
|
|
*/
|
||
|
|
int avail_min;
|
||
|
|
int raw_flag;
|
||
|
|
unsigned int in_init_channels;//keep the record init channels
|
||
|
|
};
|
||
|
|
|
||
|
|
/* PCM parameters */
|
||
|
|
enum pcm_param
|
||
|
|
{
|
||
|
|
PCM_PARAM_SAMPLE_BITS,
|
||
|
|
PCM_PARAM_FRAME_BITS,
|
||
|
|
PCM_PARAM_CHANNELS,
|
||
|
|
PCM_PARAM_RATE,
|
||
|
|
PCM_PARAM_PERIOD_TIME,
|
||
|
|
PCM_PARAM_PERIOD_SIZE,
|
||
|
|
PCM_PARAM_PERIOD_BYTES,
|
||
|
|
PCM_PARAM_PERIODS,
|
||
|
|
PCM_PARAM_BUFFER_TIME,
|
||
|
|
PCM_PARAM_BUFFER_SIZE,
|
||
|
|
PCM_PARAM_BUFFER_BYTES,
|
||
|
|
PCM_PARAM_TICK_TIME,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* 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_req(unsigned int card, unsigned int device,
|
||
|
|
unsigned int flags, struct pcm_config *config, int requested_rate);
|
||
|
|
|
||
|
|
/* 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);
|
||
|
|
|
||
|
|
/* Obtain the parameters for a PCM */
|
||
|
|
struct pcm_params *pcm_params_get(unsigned int card, unsigned int device,
|
||
|
|
unsigned int flags);
|
||
|
|
void pcm_params_free(struct pcm_params *pcm_params);
|
||
|
|
unsigned int pcm_params_get_min(struct pcm_params *pcm_params,
|
||
|
|
enum pcm_param param);
|
||
|
|
unsigned int pcm_params_get_max(struct pcm_params *pcm_params,
|
||
|
|
enum pcm_param param);
|
||
|
|
|
||
|
|
/* 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 sample size in bits for a PCM format.
|
||
|
|
* As with ALSA formats, this is the storage size for the format, whereas the
|
||
|
|
* format represents the number of significant bits. For example,
|
||
|
|
* PCM_FORMAT_S24_LE uses 32 bits of storage.
|
||
|
|
*/
|
||
|
|
unsigned int pcm_format_to_bits(enum pcm_format format);
|
||
|
|
|
||
|
|
/* Returns the buffer size (int frames) that should be used for pcm_write. */
|
||
|
|
unsigned int pcm_get_buffer_size(struct pcm *pcm);
|
||
|
|
unsigned int pcm_frames_to_bytes(struct pcm *pcm, unsigned int frames);
|
||
|
|
unsigned int pcm_bytes_to_frames(struct pcm *pcm, unsigned int bytes);
|
||
|
|
|
||
|
|
/* Returns the pcm latency in ms */
|
||
|
|
unsigned int pcm_get_latency(struct pcm *pcm);
|
||
|
|
|
||
|
|
/* Returns available frames in pcm buffer and corresponding time stamp.
|
||
|
|
* The clock is CLOCK_MONOTONIC if flag PCM_MONOTONIC was specified in pcm_open,
|
||
|
|
* otherwise the clock is CLOCK_REALTIME.
|
||
|
|
* For an input stream, frames available are frames ready for the
|
||
|
|
* application to read.
|
||
|
|
* For an output stream, frames available are the number of empty frames available
|
||
|
|
* for the application to write.
|
||
|
|
*/
|
||
|
|
int pcm_get_htimestamp(struct pcm *pcm, unsigned int *avail,
|
||
|
|
struct timespec *tstamp);
|
||
|
|
|
||
|
|
/* 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, const void *data, unsigned int count);
|
||
|
|
int pcm_read(struct pcm *pcm, void *data, unsigned int count);
|
||
|
|
int pcm_read_ex(struct pcm *pcm, void *data, unsigned int count);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* mmap() support.
|
||
|
|
*/
|
||
|
|
int pcm_mmap_write(struct pcm *pcm, const void *data, unsigned int count);
|
||
|
|
int pcm_mmap_read(struct pcm *pcm, void *data, unsigned int count);
|
||
|
|
int pcm_mmap_begin(struct pcm *pcm, void **areas, unsigned int *offset,
|
||
|
|
unsigned int *frames);
|
||
|
|
int pcm_mmap_commit(struct pcm *pcm, unsigned int offset, unsigned int frames);
|
||
|
|
|
||
|
|
/* Start and stop a PCM channel that doesn't transfer data */
|
||
|
|
int pcm_start(struct pcm *pcm);
|
||
|
|
int pcm_stop(struct pcm *pcm);
|
||
|
|
|
||
|
|
/* Interrupt driven API */
|
||
|
|
int pcm_wait(struct pcm *pcm, int timeout);
|
||
|
|
|
||
|
|
/* Change avail_min after the stream has been opened with no need to stop the stream.
|
||
|
|
* Only accepted if opened with PCM_MMAP and PCM_NOIRQ flags
|
||
|
|
*/
|
||
|
|
int pcm_set_avail_min(struct pcm *pcm, int avail_min);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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);
|
||
|
|
|
||
|
|
/* Get info about a mixer */
|
||
|
|
const char *mixer_get_name(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 */
|
||
|
|
const char *mixer_ctl_get_name(struct mixer_ctl *ctl);
|
||
|
|
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);
|
||
|
|
const char *mixer_ctl_get_enum_string(struct mixer_ctl *ctl,
|
||
|
|
unsigned int enum_id);
|
||
|
|
|
||
|
|
/* Some sound cards update their controls due to external events,
|
||
|
|
* such as HDMI EDID byte data changing when an HDMI cable is
|
||
|
|
* connected. This API allows the count of elements to be updated.
|
||
|
|
*/
|
||
|
|
void mixer_ctl_update(struct mixer_ctl *ctl);
|
||
|
|
|
||
|
|
/* 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_get_array(struct mixer_ctl *ctl, void *array, size_t count);
|
||
|
|
int mixer_ctl_set_value(struct mixer_ctl *ctl, unsigned int id, int value);
|
||
|
|
int mixer_ctl_set_array(struct mixer_ctl *ctl, const void *array, size_t count);
|
||
|
|
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);
|
||
|
|
|
||
|
|
#if defined(__cplusplus)
|
||
|
|
} /* extern "C" */
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|