pcm.h

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/*
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 of
 *   the License, or (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */
 
#ifndef __ALSA_PCM_H
#define __ALSA_PCM_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <stdint.h>
 
#define SND_PCM_DLSYM_VERSION       _dlsym_pcm_001
 
typedef struct _snd_pcm_info snd_pcm_info_t;
 
typedef struct _snd_pcm_hw_params snd_pcm_hw_params_t;
 
typedef struct _snd_pcm_sw_params snd_pcm_sw_params_t;
 typedef struct _snd_pcm_status snd_pcm_status_t;
typedef struct _snd_pcm_access_mask snd_pcm_access_mask_t;
typedef struct _snd_pcm_format_mask snd_pcm_format_mask_t;
typedef struct _snd_pcm_subformat_mask snd_pcm_subformat_mask_t;
 
typedef enum _snd_pcm_class {
    SND_PCM_CLASS_GENERIC = 0,
    SND_PCM_CLASS_MULTI,
    SND_PCM_CLASS_MODEM,
    SND_PCM_CLASS_DIGITIZER,
    SND_PCM_CLASS_LAST = SND_PCM_CLASS_DIGITIZER
} snd_pcm_class_t;
 
typedef enum _snd_pcm_subclass {
    SND_PCM_SUBCLASS_GENERIC_MIX = 0,
    SND_PCM_SUBCLASS_MULTI_MIX,
    SND_PCM_SUBCLASS_LAST = SND_PCM_SUBCLASS_MULTI_MIX
} snd_pcm_subclass_t;
 
typedef enum _snd_pcm_stream {
    SND_PCM_STREAM_PLAYBACK = 0,
    SND_PCM_STREAM_CAPTURE,
    SND_PCM_STREAM_LAST = SND_PCM_STREAM_CAPTURE
} snd_pcm_stream_t;
 
typedef enum _snd_pcm_access {
    SND_PCM_ACCESS_MMAP_INTERLEAVED = 0,
    SND_PCM_ACCESS_MMAP_NONINTERLEAVED,
    SND_PCM_ACCESS_MMAP_COMPLEX,
    SND_PCM_ACCESS_RW_INTERLEAVED,
    SND_PCM_ACCESS_RW_NONINTERLEAVED,
    SND_PCM_ACCESS_LAST = SND_PCM_ACCESS_RW_NONINTERLEAVED
} snd_pcm_access_t;
 
typedef enum _snd_pcm_format {
    SND_PCM_FORMAT_UNKNOWN = -1,
    SND_PCM_FORMAT_S8 = 0,
    SND_PCM_FORMAT_U8,
    SND_PCM_FORMAT_S16_LE,
    SND_PCM_FORMAT_S16_BE,
    SND_PCM_FORMAT_U16_LE,
    SND_PCM_FORMAT_U16_BE,
    SND_PCM_FORMAT_S24_LE,
    SND_PCM_FORMAT_S24_BE,
    SND_PCM_FORMAT_U24_LE,
    SND_PCM_FORMAT_U24_BE,
    SND_PCM_FORMAT_S32_LE,
    SND_PCM_FORMAT_S32_BE,
    SND_PCM_FORMAT_U32_LE,
    SND_PCM_FORMAT_U32_BE,
    SND_PCM_FORMAT_FLOAT_LE,
    SND_PCM_FORMAT_FLOAT_BE,
    SND_PCM_FORMAT_FLOAT64_LE,
    SND_PCM_FORMAT_FLOAT64_BE,
    SND_PCM_FORMAT_IEC958_SUBFRAME_LE,
    SND_PCM_FORMAT_IEC958_SUBFRAME_BE,
    SND_PCM_FORMAT_MU_LAW,
    SND_PCM_FORMAT_A_LAW,
    SND_PCM_FORMAT_IMA_ADPCM,
    SND_PCM_FORMAT_MPEG,
    SND_PCM_FORMAT_GSM,
    SND_PCM_FORMAT_S20_LE,
    SND_PCM_FORMAT_S20_BE,
    SND_PCM_FORMAT_U20_LE,
    SND_PCM_FORMAT_U20_BE,
    SND_PCM_FORMAT_SPECIAL = 31,
    SND_PCM_FORMAT_S24_3LE = 32,
    SND_PCM_FORMAT_S24_3BE,
    SND_PCM_FORMAT_U24_3LE,
    SND_PCM_FORMAT_U24_3BE,
    SND_PCM_FORMAT_S20_3LE,
    SND_PCM_FORMAT_S20_3BE,
    SND_PCM_FORMAT_U20_3LE,
    SND_PCM_FORMAT_U20_3BE,
    SND_PCM_FORMAT_S18_3LE,
    SND_PCM_FORMAT_S18_3BE,
    SND_PCM_FORMAT_U18_3LE,
    SND_PCM_FORMAT_U18_3BE,
    /* G.723 (ADPCM) 24 kbit/s, 8 samples in 3 bytes */
    SND_PCM_FORMAT_G723_24,
    /* G.723 (ADPCM) 24 kbit/s, 1 sample in 1 byte */
    SND_PCM_FORMAT_G723_24_1B,
    /* G.723 (ADPCM) 40 kbit/s, 8 samples in 3 bytes */
    SND_PCM_FORMAT_G723_40,
    /* G.723 (ADPCM) 40 kbit/s, 1 sample in 1 byte */
    SND_PCM_FORMAT_G723_40_1B,
    /* Direct Stream Digital (DSD) in 1-byte samples (x8) */
    SND_PCM_FORMAT_DSD_U8,
    /* Direct Stream Digital (DSD) in 2-byte samples (x16) */
    SND_PCM_FORMAT_DSD_U16_LE,
    /* Direct Stream Digital (DSD) in 4-byte samples (x32) */
    SND_PCM_FORMAT_DSD_U32_LE,
    /* Direct Stream Digital (DSD) in 2-byte samples (x16) */
    SND_PCM_FORMAT_DSD_U16_BE,
    /* Direct Stream Digital (DSD) in 4-byte samples (x32) */
    SND_PCM_FORMAT_DSD_U32_BE,
    SND_PCM_FORMAT_LAST = SND_PCM_FORMAT_DSD_U32_BE,
 
#if __BYTE_ORDER == __LITTLE_ENDIAN
    SND_PCM_FORMAT_S16 = SND_PCM_FORMAT_S16_LE,
    SND_PCM_FORMAT_U16 = SND_PCM_FORMAT_U16_LE,
    SND_PCM_FORMAT_S24 = SND_PCM_FORMAT_S24_LE,
    SND_PCM_FORMAT_U24 = SND_PCM_FORMAT_U24_LE,
    SND_PCM_FORMAT_S32 = SND_PCM_FORMAT_S32_LE,
    SND_PCM_FORMAT_U32 = SND_PCM_FORMAT_U32_LE,
    SND_PCM_FORMAT_FLOAT = SND_PCM_FORMAT_FLOAT_LE,
    SND_PCM_FORMAT_FLOAT64 = SND_PCM_FORMAT_FLOAT64_LE,
    SND_PCM_FORMAT_IEC958_SUBFRAME = SND_PCM_FORMAT_IEC958_SUBFRAME_LE,
    SND_PCM_FORMAT_S20 = SND_PCM_FORMAT_S20_LE,
    SND_PCM_FORMAT_U20 = SND_PCM_FORMAT_U20_LE,
#elif __BYTE_ORDER == __BIG_ENDIAN
    SND_PCM_FORMAT_S16 = SND_PCM_FORMAT_S16_BE,
    SND_PCM_FORMAT_U16 = SND_PCM_FORMAT_U16_BE,
    SND_PCM_FORMAT_S24 = SND_PCM_FORMAT_S24_BE,
    SND_PCM_FORMAT_U24 = SND_PCM_FORMAT_U24_BE,
    SND_PCM_FORMAT_S32 = SND_PCM_FORMAT_S32_BE,
    SND_PCM_FORMAT_U32 = SND_PCM_FORMAT_U32_BE,
    SND_PCM_FORMAT_FLOAT = SND_PCM_FORMAT_FLOAT_BE,
    SND_PCM_FORMAT_FLOAT64 = SND_PCM_FORMAT_FLOAT64_BE,
    SND_PCM_FORMAT_IEC958_SUBFRAME = SND_PCM_FORMAT_IEC958_SUBFRAME_BE,
    SND_PCM_FORMAT_S20 = SND_PCM_FORMAT_S20_BE,
    SND_PCM_FORMAT_U20 = SND_PCM_FORMAT_U20_BE,
#else
#error "Unknown endian"
#endif
} snd_pcm_format_t;
 
typedef enum _snd_pcm_subformat {
    SND_PCM_SUBFORMAT_STD = 0,
    SND_PCM_SUBFORMAT_LAST = SND_PCM_SUBFORMAT_STD
} snd_pcm_subformat_t;
 
typedef enum _snd_pcm_state {
    SND_PCM_STATE_OPEN = 0,
    SND_PCM_STATE_SETUP,
    SND_PCM_STATE_PREPARED,
    SND_PCM_STATE_RUNNING,
    SND_PCM_STATE_XRUN,
    SND_PCM_STATE_DRAINING,
    SND_PCM_STATE_PAUSED,
    SND_PCM_STATE_SUSPENDED,
    SND_PCM_STATE_DISCONNECTED,
    SND_PCM_STATE_LAST = SND_PCM_STATE_DISCONNECTED,
    SND_PCM_STATE_PRIVATE1 = 1024
} snd_pcm_state_t;
 
typedef enum _snd_pcm_start {
    SND_PCM_START_DATA = 0,
    SND_PCM_START_EXPLICIT,
    SND_PCM_START_LAST = SND_PCM_START_EXPLICIT
} snd_pcm_start_t;
 
typedef enum _snd_pcm_xrun {
    SND_PCM_XRUN_NONE = 0,
    SND_PCM_XRUN_STOP,
    SND_PCM_XRUN_LAST = SND_PCM_XRUN_STOP
} snd_pcm_xrun_t;
 
typedef enum _snd_pcm_tstamp {
    SND_PCM_TSTAMP_NONE = 0,
    SND_PCM_TSTAMP_ENABLE,
    SND_PCM_TSTAMP_MMAP = SND_PCM_TSTAMP_ENABLE,
    SND_PCM_TSTAMP_LAST = SND_PCM_TSTAMP_ENABLE
} snd_pcm_tstamp_t;
 
typedef enum _snd_pcm_tstamp_type {
    SND_PCM_TSTAMP_TYPE_GETTIMEOFDAY = 0,   
    SND_PCM_TSTAMP_TYPE_MONOTONIC,  
    SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW,  
    SND_PCM_TSTAMP_TYPE_LAST = SND_PCM_TSTAMP_TYPE_MONOTONIC_RAW,
} snd_pcm_tstamp_type_t;
 
typedef enum _snd_pcm_audio_tstamp_type {
    SND_PCM_AUDIO_TSTAMP_TYPE_COMPAT = 0,
    SND_PCM_AUDIO_TSTAMP_TYPE_DEFAULT = 1,           
    SND_PCM_AUDIO_TSTAMP_TYPE_LINK = 2,            
    SND_PCM_AUDIO_TSTAMP_TYPE_LINK_ABSOLUTE = 3,       
    SND_PCM_AUDIO_TSTAMP_TYPE_LINK_ESTIMATED = 4,    
    SND_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED = 5, 
    SND_PCM_AUDIO_TSTAMP_TYPE_LAST = SND_PCM_AUDIO_TSTAMP_TYPE_LINK_SYNCHRONIZED
} snd_pcm_audio_tstamp_type_t;
 
typedef struct _snd_pcm_audio_tstamp_config {
    /* 5 of max 16 bits used */
    unsigned int type_requested:4;
    unsigned int report_delay:1; /* add total delay to A/D or D/A */
} snd_pcm_audio_tstamp_config_t;
 
typedef struct _snd_pcm_audio_tstamp_report {
    /* 6 of max 16 bits used for bit-fields */
 
    /* for backwards compatibility */
    unsigned int valid:1;
 
    /* actual type if hardware could not support requested timestamp */
    unsigned int actual_type:4;
 
    /* accuracy represented in ns units */
    unsigned int accuracy_report:1; /* 0 if accuracy unknown, 1 if accuracy field is valid */
    unsigned int accuracy; /* up to 4.29s, will be packed in separate field  */
} snd_pcm_audio_tstamp_report_t;
 
typedef unsigned long snd_pcm_uframes_t;
typedef long snd_pcm_sframes_t;
 
#define SND_PCM_NONBLOCK        0x00000001
#define SND_PCM_ASYNC           0x00000002
#define SND_PCM_ABORT           0x00008000
#define SND_PCM_NO_AUTO_RESAMPLE    0x00010000
#define SND_PCM_NO_AUTO_CHANNELS    0x00020000
#define SND_PCM_NO_AUTO_FORMAT      0x00040000
#define SND_PCM_NO_SOFTVOL      0x00080000
 
typedef struct _snd_pcm snd_pcm_t;
 
enum _snd_pcm_type {
    SND_PCM_TYPE_HW = 0,
    SND_PCM_TYPE_HOOKS,
    SND_PCM_TYPE_MULTI,
    SND_PCM_TYPE_FILE,
    SND_PCM_TYPE_NULL,
    SND_PCM_TYPE_SHM,
    SND_PCM_TYPE_INET,
    SND_PCM_TYPE_COPY,
    SND_PCM_TYPE_LINEAR,
    SND_PCM_TYPE_ALAW,
    SND_PCM_TYPE_MULAW,
    SND_PCM_TYPE_ADPCM,
    SND_PCM_TYPE_RATE,
    SND_PCM_TYPE_ROUTE,
    SND_PCM_TYPE_PLUG,
    SND_PCM_TYPE_SHARE,
    SND_PCM_TYPE_METER,
    SND_PCM_TYPE_MIX,
    SND_PCM_TYPE_DROUTE,
    SND_PCM_TYPE_LBSERVER,
    SND_PCM_TYPE_LINEAR_FLOAT,
    SND_PCM_TYPE_LADSPA,
    SND_PCM_TYPE_DMIX,
    SND_PCM_TYPE_JACK,
    SND_PCM_TYPE_DSNOOP,
    SND_PCM_TYPE_DSHARE,
    SND_PCM_TYPE_IEC958,
    SND_PCM_TYPE_SOFTVOL,
    SND_PCM_TYPE_IOPLUG,
    SND_PCM_TYPE_EXTPLUG,
    SND_PCM_TYPE_MMAP_EMUL,
    SND_PCM_TYPE_LAST = SND_PCM_TYPE_MMAP_EMUL
};
 
typedef enum _snd_pcm_type snd_pcm_type_t;
 
typedef struct _snd_pcm_channel_area {
    void *addr;
    unsigned int first;
    unsigned int step;
} snd_pcm_channel_area_t;
 
typedef union _snd_pcm_sync_id {
    unsigned char id[16];
    unsigned short id16[8];
    unsigned int id32[4];
} snd_pcm_sync_id_t;
 
typedef struct _snd_pcm_scope snd_pcm_scope_t;
 
int snd_pcm_open(snd_pcm_t **pcm, const char *name, 
         snd_pcm_stream_t stream, int mode);
int snd_pcm_open_lconf(snd_pcm_t **pcm, const char *name, 
               snd_pcm_stream_t stream, int mode,
               snd_config_t *lconf);
int snd_pcm_open_fallback(snd_pcm_t **pcm, snd_config_t *root,
              const char *name, const char *orig_name,
              snd_pcm_stream_t stream, int mode);
 
int snd_pcm_close(snd_pcm_t *pcm);
const char *snd_pcm_name(snd_pcm_t *pcm);
snd_pcm_type_t snd_pcm_type(snd_pcm_t *pcm);
snd_pcm_stream_t snd_pcm_stream(snd_pcm_t *pcm);
int snd_pcm_poll_descriptors_count(snd_pcm_t *pcm);
int snd_pcm_poll_descriptors(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space);
int snd_pcm_poll_descriptors_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
int snd_pcm_nonblock(snd_pcm_t *pcm, int nonblock);
static __inline__ int snd_pcm_abort(snd_pcm_t *pcm) { return snd_pcm_nonblock(pcm, 2); }
int snd_async_add_pcm_handler(snd_async_handler_t **handler, snd_pcm_t *pcm, 
                  snd_async_callback_t callback, void *private_data);
snd_pcm_t *snd_async_handler_get_pcm(snd_async_handler_t *handler);
int snd_pcm_info(snd_pcm_t *pcm, snd_pcm_info_t *info);
int snd_pcm_hw_params_current(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
int snd_pcm_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
int snd_pcm_hw_free(snd_pcm_t *pcm);
int snd_pcm_sw_params_current(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
int snd_pcm_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
int snd_pcm_prepare(snd_pcm_t *pcm);
int snd_pcm_reset(snd_pcm_t *pcm);
int snd_pcm_status(snd_pcm_t *pcm, snd_pcm_status_t *status);
int snd_pcm_start(snd_pcm_t *pcm);
int snd_pcm_drop(snd_pcm_t *pcm);
int snd_pcm_drain(snd_pcm_t *pcm);
int snd_pcm_pause(snd_pcm_t *pcm, int enable);
snd_pcm_state_t snd_pcm_state(snd_pcm_t *pcm);
int snd_pcm_hwsync(snd_pcm_t *pcm);
int snd_pcm_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp);
int snd_pcm_resume(snd_pcm_t *pcm);
int snd_pcm_htimestamp(snd_pcm_t *pcm, snd_pcm_uframes_t *avail, snd_htimestamp_t *tstamp);
snd_pcm_sframes_t snd_pcm_avail(snd_pcm_t *pcm);
snd_pcm_sframes_t snd_pcm_avail_update(snd_pcm_t *pcm);
int snd_pcm_avail_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *availp, snd_pcm_sframes_t *delayp);
snd_pcm_sframes_t snd_pcm_rewindable(snd_pcm_t *pcm);
snd_pcm_sframes_t snd_pcm_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_forwardable(snd_pcm_t *pcm);
snd_pcm_sframes_t snd_pcm_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
int snd_pcm_wait(snd_pcm_t *pcm, int timeout);
 
int snd_pcm_link(snd_pcm_t *pcm1, snd_pcm_t *pcm2);
int snd_pcm_unlink(snd_pcm_t *pcm);
 
#define SND_CHMAP_API_VERSION   ((1 << 16) | (0 << 8) | 1)
 
enum snd_pcm_chmap_type {
    SND_CHMAP_TYPE_NONE = 0,
    SND_CHMAP_TYPE_FIXED,   
    SND_CHMAP_TYPE_VAR, 
    SND_CHMAP_TYPE_PAIRED,  
    SND_CHMAP_TYPE_LAST = SND_CHMAP_TYPE_PAIRED, 
};
 
enum snd_pcm_chmap_position {
    SND_CHMAP_UNKNOWN = 0,  
    SND_CHMAP_NA,       
    SND_CHMAP_MONO,     
    SND_CHMAP_FL,       
    SND_CHMAP_FR,       
    SND_CHMAP_RL,       
    SND_CHMAP_RR,       
    SND_CHMAP_FC,       
    SND_CHMAP_LFE,      
    SND_CHMAP_SL,       
    SND_CHMAP_SR,       
    SND_CHMAP_RC,       
    SND_CHMAP_FLC,      
    SND_CHMAP_FRC,      
    SND_CHMAP_RLC,      
    SND_CHMAP_RRC,      
    SND_CHMAP_FLW,      
    SND_CHMAP_FRW,      
    SND_CHMAP_FLH,      
    SND_CHMAP_FCH,      
    SND_CHMAP_FRH,      
    SND_CHMAP_TC,       
    SND_CHMAP_TFL,      
    SND_CHMAP_TFR,      
    SND_CHMAP_TFC,      
    SND_CHMAP_TRL,      
    SND_CHMAP_TRR,      
    SND_CHMAP_TRC,      
    SND_CHMAP_TFLC,     
    SND_CHMAP_TFRC,     
    SND_CHMAP_TSL,      
    SND_CHMAP_TSR,      
    SND_CHMAP_LLFE,     
    SND_CHMAP_RLFE,     
    SND_CHMAP_BC,       
    SND_CHMAP_BLC,      
    SND_CHMAP_BRC,      
    SND_CHMAP_LAST = SND_CHMAP_BRC,
};
 
#define SND_CHMAP_POSITION_MASK     0xffff
 
#define SND_CHMAP_PHASE_INVERSE     (0x01 << 16)
#define SND_CHMAP_DRIVER_SPEC       (0x02 << 16)
 
typedef struct snd_pcm_chmap {
    unsigned int channels;  
    unsigned int pos[0];    
} snd_pcm_chmap_t;
 
typedef struct snd_pcm_chmap_query {
    enum snd_pcm_chmap_type type;   
    snd_pcm_chmap_t map;        
} snd_pcm_chmap_query_t;
 
 
snd_pcm_chmap_query_t **snd_pcm_query_chmaps(snd_pcm_t *pcm);
snd_pcm_chmap_query_t **snd_pcm_query_chmaps_from_hw(int card, int dev,
                             int subdev,
                             snd_pcm_stream_t stream);
void snd_pcm_free_chmaps(snd_pcm_chmap_query_t **maps);
snd_pcm_chmap_t *snd_pcm_get_chmap(snd_pcm_t *pcm);
int snd_pcm_set_chmap(snd_pcm_t *pcm, const snd_pcm_chmap_t *map);
 
const char *snd_pcm_chmap_type_name(enum snd_pcm_chmap_type val);
const char *snd_pcm_chmap_name(enum snd_pcm_chmap_position val);
const char *snd_pcm_chmap_long_name(enum snd_pcm_chmap_position val);
int snd_pcm_chmap_print(const snd_pcm_chmap_t *map, size_t maxlen, char *buf);
unsigned int snd_pcm_chmap_from_string(const char *str);
snd_pcm_chmap_t *snd_pcm_chmap_parse_string(const char *str);
 
//int snd_pcm_mixer_element(snd_pcm_t *pcm, snd_mixer_t *mixer, snd_mixer_elem_t **elem);
 
/*
 * application helpers - these functions are implemented on top
 * of the basic API
 */
 
int snd_pcm_recover(snd_pcm_t *pcm, int err, int silent);
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);
int snd_pcm_get_params(snd_pcm_t *pcm,
                       snd_pcm_uframes_t *buffer_size,
                       snd_pcm_uframes_t *period_size);
 
size_t snd_pcm_info_sizeof(void);
#define snd_pcm_info_alloca(ptr) __snd_alloca(ptr, snd_pcm_info)
int snd_pcm_info_malloc(snd_pcm_info_t **ptr);
void snd_pcm_info_free(snd_pcm_info_t *obj);
void snd_pcm_info_copy(snd_pcm_info_t *dst, const snd_pcm_info_t *src);
unsigned int snd_pcm_info_get_device(const snd_pcm_info_t *obj);
unsigned int snd_pcm_info_get_subdevice(const snd_pcm_info_t *obj);
snd_pcm_stream_t snd_pcm_info_get_stream(const snd_pcm_info_t *obj);
int snd_pcm_info_get_card(const snd_pcm_info_t *obj);
const char *snd_pcm_info_get_id(const snd_pcm_info_t *obj);
const char *snd_pcm_info_get_name(const snd_pcm_info_t *obj);
const char *snd_pcm_info_get_subdevice_name(const snd_pcm_info_t *obj);
snd_pcm_class_t snd_pcm_info_get_class(const snd_pcm_info_t *obj);
snd_pcm_subclass_t snd_pcm_info_get_subclass(const snd_pcm_info_t *obj);
unsigned int snd_pcm_info_get_subdevices_count(const snd_pcm_info_t *obj);
unsigned int snd_pcm_info_get_subdevices_avail(const snd_pcm_info_t *obj);
snd_pcm_sync_id_t snd_pcm_info_get_sync(const snd_pcm_info_t *obj);
void snd_pcm_info_set_device(snd_pcm_info_t *obj, unsigned int val);
void snd_pcm_info_set_subdevice(snd_pcm_info_t *obj, unsigned int val);
void snd_pcm_info_set_stream(snd_pcm_info_t *obj, snd_pcm_stream_t val);
 
int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
 
int snd_pcm_hw_params_can_mmap_sample_resolution(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_double(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_batch(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_block_transfer(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_monotonic(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_overrange(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_pause(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_resume(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_half_duplex(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_is_joint_duplex(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_sync_start(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_disable_period_wakeup(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_supports_audio_wallclock_ts(const snd_pcm_hw_params_t *params); /* deprecated, use audio_ts_type */
int snd_pcm_hw_params_supports_audio_ts_type(const snd_pcm_hw_params_t *params, int type);
int snd_pcm_hw_params_get_rate_numden(const snd_pcm_hw_params_t *params,
                      unsigned int *rate_num,
                      unsigned int *rate_den);
int snd_pcm_hw_params_get_sbits(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_get_fifo_size(const snd_pcm_hw_params_t *params);
 
#if 0
typedef struct _snd_pcm_hw_strategy snd_pcm_hw_strategy_t;
 
/* choices need to be sorted on ascending badness */
typedef struct _snd_pcm_hw_strategy_simple_choices_list {
    unsigned int value;
    unsigned int badness;
} snd_pcm_hw_strategy_simple_choices_list_t;
 
int snd_pcm_hw_params_strategy(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                   const snd_pcm_hw_strategy_t *strategy,
                   unsigned int badness_min,
                   unsigned int badness_max);
 
void snd_pcm_hw_strategy_free(snd_pcm_hw_strategy_t *strategy);
int snd_pcm_hw_strategy_simple(snd_pcm_hw_strategy_t **strategyp,
                   unsigned int badness_min,
                   unsigned int badness_max);
int snd_pcm_hw_params_try_explain_failure(snd_pcm_t *pcm,
                      snd_pcm_hw_params_t *fail,
                      snd_pcm_hw_params_t *success,
                      unsigned int depth,
                      snd_output_t *out);
 
#endif
 
size_t snd_pcm_hw_params_sizeof(void);
#define snd_pcm_hw_params_alloca(ptr) __snd_alloca(ptr, snd_pcm_hw_params)
int snd_pcm_hw_params_malloc(snd_pcm_hw_params_t **ptr);
void snd_pcm_hw_params_free(snd_pcm_hw_params_t *obj);
void snd_pcm_hw_params_copy(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src);
 
#if !defined(ALSA_LIBRARY_BUILD) && !defined(ALSA_PCM_OLD_HW_PARAMS_API)
 
int snd_pcm_hw_params_get_access(const snd_pcm_hw_params_t *params, snd_pcm_access_t *_access);
int snd_pcm_hw_params_test_access(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access);
int snd_pcm_hw_params_set_access(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t _access);
int snd_pcm_hw_params_set_access_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t *_access);
int snd_pcm_hw_params_set_access_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t *_access);
int snd_pcm_hw_params_set_access_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_mask_t *mask);
int snd_pcm_hw_params_get_access_mask(snd_pcm_hw_params_t *params, snd_pcm_access_mask_t *mask);
 
int snd_pcm_hw_params_get_format(const snd_pcm_hw_params_t *params, snd_pcm_format_t *val);
int snd_pcm_hw_params_test_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
int snd_pcm_hw_params_set_format(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val);
int snd_pcm_hw_params_set_format_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t *format);
int snd_pcm_hw_params_set_format_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t *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);
void snd_pcm_hw_params_get_format_mask(snd_pcm_hw_params_t *params, snd_pcm_format_mask_t *mask);
 
int snd_pcm_hw_params_get_subformat(const snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat);
int snd_pcm_hw_params_test_subformat(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t subformat);
int snd_pcm_hw_params_set_subformat(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t subformat);
int snd_pcm_hw_params_set_subformat_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat);
int snd_pcm_hw_params_set_subformat_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t *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);
void snd_pcm_hw_params_get_subformat_mask(snd_pcm_hw_params_t *params, snd_pcm_subformat_mask_t *mask);
 
int snd_pcm_hw_params_get_channels(const snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_get_channels_min(const snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_get_channels_max(const snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_test_channels(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
int snd_pcm_hw_params_set_channels(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
int snd_pcm_hw_params_set_channels_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_channels_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_channels_minmax(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *min, unsigned int *max);
int snd_pcm_hw_params_set_channels_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_channels_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_channels_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
 
int snd_pcm_hw_params_get_rate(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_rate_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_rate_max(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_test_rate(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_rate(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_rate_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_rate_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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);
int snd_pcm_hw_params_set_rate_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_rate_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_rate_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_rate_resample(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
int snd_pcm_hw_params_get_rate_resample(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_export_buffer(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
int snd_pcm_hw_params_get_export_buffer(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int snd_pcm_hw_params_set_period_wakeup(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val);
int snd_pcm_hw_params_get_period_wakeup(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
 
int snd_pcm_hw_params_get_period_time(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_period_time_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_period_time_max(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_test_period_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_period_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_period_time_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_period_time_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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);
int snd_pcm_hw_params_set_period_time_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_period_time_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_period_time_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
 
int snd_pcm_hw_params_get_period_size(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
int snd_pcm_hw_params_get_period_size_min(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
int snd_pcm_hw_params_get_period_size_max(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
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);
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);
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);
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);
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);
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);
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);
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);
int snd_pcm_hw_params_set_period_size_integer(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
 
int snd_pcm_hw_params_get_periods(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_periods_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_periods_max(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_test_periods(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_periods(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_periods_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_periods_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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);
int snd_pcm_hw_params_set_periods_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_periods_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_periods_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_periods_integer(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
 
int snd_pcm_hw_params_get_buffer_time(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_buffer_time_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_get_buffer_time_max(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_test_buffer_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_buffer_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_buffer_time_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_buffer_time_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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);
int snd_pcm_hw_params_set_buffer_time_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_buffer_time_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_buffer_time_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
 
int snd_pcm_hw_params_get_buffer_size(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_get_buffer_size_min(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_get_buffer_size_max(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_test_buffer_size(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_hw_params_set_buffer_size(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_hw_params_set_buffer_size_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_set_buffer_size_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
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);
int snd_pcm_hw_params_set_buffer_size_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_set_buffer_size_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_hw_params_set_buffer_size_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
 
#endif /* !ALSA_LIBRARY_BUILD && !ALSA_PCM_OLD_HW_PARAMS_API */
 
int snd_pcm_hw_params_get_min_align(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
 
size_t snd_pcm_sw_params_sizeof(void);
#define snd_pcm_sw_params_alloca(ptr) __snd_alloca(ptr, snd_pcm_sw_params)
int snd_pcm_sw_params_malloc(snd_pcm_sw_params_t **ptr);
void snd_pcm_sw_params_free(snd_pcm_sw_params_t *obj);
void snd_pcm_sw_params_copy(snd_pcm_sw_params_t *dst, const snd_pcm_sw_params_t *src);
int snd_pcm_sw_params_get_boundary(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
 
#if !defined(ALSA_LIBRARY_BUILD) && !defined(ALSA_PCM_OLD_SW_PARAMS_API)
 
int snd_pcm_sw_params_set_tstamp_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_tstamp_t val);
int snd_pcm_sw_params_get_tstamp_mode(const snd_pcm_sw_params_t *params, snd_pcm_tstamp_t *val);
int snd_pcm_sw_params_set_tstamp_type(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_tstamp_type_t val);
int snd_pcm_sw_params_get_tstamp_type(const snd_pcm_sw_params_t *params, snd_pcm_tstamp_type_t *val);
int snd_pcm_sw_params_set_avail_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_avail_min(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_period_event(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, int val);
int snd_pcm_sw_params_get_period_event(const snd_pcm_sw_params_t *params, int *val);
int snd_pcm_sw_params_set_start_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_start_threshold(const snd_pcm_sw_params_t *paramsm, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_stop_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_stop_threshold(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_silence_threshold(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_silence_threshold(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
int snd_pcm_sw_params_set_silence_size(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int snd_pcm_sw_params_get_silence_size(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
 
#endif /* !ALSA_LIBRARY_BUILD && !ALSA_PCM_OLD_SW_PARAMS_API */
 
/* include old API */
#ifndef ALSA_LIBRARY_BUILD
#if defined(ALSA_PCM_OLD_HW_PARAMS_API) || defined(ALSA_PCM_OLD_SW_PARAMS_API)
#include "pcm_old.h"
#endif
#endif
 
size_t snd_pcm_access_mask_sizeof(void);
#define snd_pcm_access_mask_alloca(ptr) __snd_alloca(ptr, snd_pcm_access_mask)
int snd_pcm_access_mask_malloc(snd_pcm_access_mask_t **ptr);
void snd_pcm_access_mask_free(snd_pcm_access_mask_t *obj);
void snd_pcm_access_mask_copy(snd_pcm_access_mask_t *dst, const snd_pcm_access_mask_t *src);
void snd_pcm_access_mask_none(snd_pcm_access_mask_t *mask);
void snd_pcm_access_mask_any(snd_pcm_access_mask_t *mask);
int snd_pcm_access_mask_test(const snd_pcm_access_mask_t *mask, snd_pcm_access_t val);
int snd_pcm_access_mask_empty(const snd_pcm_access_mask_t *mask);
void snd_pcm_access_mask_set(snd_pcm_access_mask_t *mask, snd_pcm_access_t val);
void snd_pcm_access_mask_reset(snd_pcm_access_mask_t *mask, snd_pcm_access_t val);
 
size_t snd_pcm_format_mask_sizeof(void);
#define snd_pcm_format_mask_alloca(ptr) __snd_alloca(ptr, snd_pcm_format_mask)
int snd_pcm_format_mask_malloc(snd_pcm_format_mask_t **ptr);
void snd_pcm_format_mask_free(snd_pcm_format_mask_t *obj);
void snd_pcm_format_mask_copy(snd_pcm_format_mask_t *dst, const snd_pcm_format_mask_t *src);
void snd_pcm_format_mask_none(snd_pcm_format_mask_t *mask);
void snd_pcm_format_mask_any(snd_pcm_format_mask_t *mask);
int snd_pcm_format_mask_test(const snd_pcm_format_mask_t *mask, snd_pcm_format_t val);
int snd_pcm_format_mask_empty(const snd_pcm_format_mask_t *mask);
void snd_pcm_format_mask_set(snd_pcm_format_mask_t *mask, snd_pcm_format_t val);
void snd_pcm_format_mask_reset(snd_pcm_format_mask_t *mask, snd_pcm_format_t val);
 
size_t snd_pcm_subformat_mask_sizeof(void);
#define snd_pcm_subformat_mask_alloca(ptr) __snd_alloca(ptr, snd_pcm_subformat_mask)
int snd_pcm_subformat_mask_malloc(snd_pcm_subformat_mask_t **ptr);
void snd_pcm_subformat_mask_free(snd_pcm_subformat_mask_t *obj);
void snd_pcm_subformat_mask_copy(snd_pcm_subformat_mask_t *dst, const snd_pcm_subformat_mask_t *src);
void snd_pcm_subformat_mask_none(snd_pcm_subformat_mask_t *mask);
void snd_pcm_subformat_mask_any(snd_pcm_subformat_mask_t *mask);
int snd_pcm_subformat_mask_test(const snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val);
int snd_pcm_subformat_mask_empty(const snd_pcm_subformat_mask_t *mask);
void snd_pcm_subformat_mask_set(snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val);
void snd_pcm_subformat_mask_reset(snd_pcm_subformat_mask_t *mask, snd_pcm_subformat_t val);
 
size_t snd_pcm_status_sizeof(void);
#define snd_pcm_status_alloca(ptr) __snd_alloca(ptr, snd_pcm_status)
int snd_pcm_status_malloc(snd_pcm_status_t **ptr);
void snd_pcm_status_free(snd_pcm_status_t *obj);
void snd_pcm_status_copy(snd_pcm_status_t *dst, const snd_pcm_status_t *src);
snd_pcm_state_t snd_pcm_status_get_state(const snd_pcm_status_t *obj);
void snd_pcm_status_get_trigger_tstamp(const snd_pcm_status_t *obj, snd_timestamp_t *ptr);
void snd_pcm_status_get_trigger_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr);
void snd_pcm_status_get_tstamp(const snd_pcm_status_t *obj, snd_timestamp_t *ptr);
void snd_pcm_status_get_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr);
void snd_pcm_status_get_audio_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr);
void snd_pcm_status_get_driver_htstamp(const snd_pcm_status_t *obj, snd_htimestamp_t *ptr);
void snd_pcm_status_get_audio_htstamp_report(const snd_pcm_status_t *obj,
                         snd_pcm_audio_tstamp_report_t *audio_tstamp_report);
void snd_pcm_status_set_audio_htstamp_config(snd_pcm_status_t *obj,
                         snd_pcm_audio_tstamp_config_t *audio_tstamp_config);
 
static inline void snd_pcm_pack_audio_tstamp_config(unsigned int *data,
                        snd_pcm_audio_tstamp_config_t *config)
{
    *data = config->report_delay;
    *data <<= 4;
    *data |= config->type_requested;
}
 
static inline void snd_pcm_unpack_audio_tstamp_report(unsigned int data, unsigned int accuracy,
                        snd_pcm_audio_tstamp_report_t *report)
{
    data >>= 16;
    report->valid = data & 1;
    report->actual_type = (data >> 1) & 0xF;
    report->accuracy_report = (data >> 5) & 1;
    report->accuracy = accuracy;
}
 
snd_pcm_sframes_t snd_pcm_status_get_delay(const snd_pcm_status_t *obj);
snd_pcm_uframes_t snd_pcm_status_get_avail(const snd_pcm_status_t *obj);
snd_pcm_uframes_t snd_pcm_status_get_avail_max(const snd_pcm_status_t *obj);
snd_pcm_uframes_t snd_pcm_status_get_overrange(const snd_pcm_status_t *obj);
 
const char *snd_pcm_type_name(snd_pcm_type_t type);
const char *snd_pcm_stream_name(const snd_pcm_stream_t stream);
const char *snd_pcm_access_name(const snd_pcm_access_t _access);
const char *snd_pcm_format_name(const snd_pcm_format_t format);
const char *snd_pcm_format_description(const snd_pcm_format_t format);
const char *snd_pcm_subformat_name(const snd_pcm_subformat_t subformat);
const char *snd_pcm_subformat_description(const snd_pcm_subformat_t subformat);
snd_pcm_format_t snd_pcm_format_value(const char* name);
const char *snd_pcm_tstamp_mode_name(const snd_pcm_tstamp_t mode);
const char *snd_pcm_state_name(const snd_pcm_state_t state);
 
int snd_pcm_dump(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_hw_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_sw_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_dump_setup(snd_pcm_t *pcm, snd_output_t *out);
int snd_pcm_hw_params_dump(snd_pcm_hw_params_t *params, snd_output_t *out);
int snd_pcm_sw_params_dump(snd_pcm_sw_params_t *params, snd_output_t *out);
int snd_pcm_status_dump(snd_pcm_status_t *status, snd_output_t *out);
 
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);
snd_pcm_sframes_t snd_pcm_mmap_commit(snd_pcm_t *pcm,
                      snd_pcm_uframes_t offset,
                      snd_pcm_uframes_t frames);
snd_pcm_sframes_t snd_pcm_mmap_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_mmap_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);                                                                
 
int snd_pcm_format_signed(snd_pcm_format_t format);
int snd_pcm_format_unsigned(snd_pcm_format_t format);
int snd_pcm_format_linear(snd_pcm_format_t format);
int snd_pcm_format_float(snd_pcm_format_t format);
int snd_pcm_format_little_endian(snd_pcm_format_t format);
int snd_pcm_format_big_endian(snd_pcm_format_t format);
int snd_pcm_format_cpu_endian(snd_pcm_format_t format);
int snd_pcm_format_width(snd_pcm_format_t format);          /* in bits */
int snd_pcm_format_physical_width(snd_pcm_format_t format);     /* in bits */
snd_pcm_format_t snd_pcm_build_linear_format(int width, int pwidth, int unsignd, int big_endian);
ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples);
uint8_t snd_pcm_format_silence(snd_pcm_format_t format);
uint16_t snd_pcm_format_silence_16(snd_pcm_format_t format);
uint32_t snd_pcm_format_silence_32(snd_pcm_format_t format);
uint64_t snd_pcm_format_silence_64(snd_pcm_format_t format);
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int samples);
 
snd_pcm_sframes_t snd_pcm_bytes_to_frames(snd_pcm_t *pcm, ssize_t bytes);
ssize_t snd_pcm_frames_to_bytes(snd_pcm_t *pcm, snd_pcm_sframes_t frames);
long snd_pcm_bytes_to_samples(snd_pcm_t *pcm, ssize_t bytes);
ssize_t snd_pcm_samples_to_bytes(snd_pcm_t *pcm, long samples);
 
int snd_pcm_area_silence(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
             unsigned int samples, snd_pcm_format_t format);
int snd_pcm_areas_silence(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
              unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
int snd_pcm_area_copy(const snd_pcm_channel_area_t *dst_channel, snd_pcm_uframes_t dst_offset,
              const snd_pcm_channel_area_t *src_channel, snd_pcm_uframes_t src_offset,
              unsigned int samples, snd_pcm_format_t format);
int snd_pcm_areas_copy(const snd_pcm_channel_area_t *dst_channels, snd_pcm_uframes_t dst_offset,
               const snd_pcm_channel_area_t *src_channels, snd_pcm_uframes_t src_offset,
               unsigned int channels, snd_pcm_uframes_t frames, snd_pcm_format_t format);
int snd_pcm_areas_copy_wrap(const snd_pcm_channel_area_t *dst_channels,
                snd_pcm_uframes_t dst_offset,
                const snd_pcm_uframes_t dst_size,
                const snd_pcm_channel_area_t *src_channels,
                snd_pcm_uframes_t src_offset,
                const snd_pcm_uframes_t src_size,
                const unsigned int channels,
                snd_pcm_uframes_t frames,
                const snd_pcm_format_t format);
 
static inline void *snd_pcm_channel_area_addr(const snd_pcm_channel_area_t *area, snd_pcm_uframes_t offset)
{
    return (char *)area->addr + (area->first + area->step * offset) / 8;
}
 
static inline unsigned int snd_pcm_channel_area_step(const snd_pcm_channel_area_t *area)
{
    return area->step / 8;
}
 
typedef enum _snd_pcm_hook_type {
    SND_PCM_HOOK_TYPE_HW_PARAMS = 0,
    SND_PCM_HOOK_TYPE_HW_FREE,
    SND_PCM_HOOK_TYPE_CLOSE,
    SND_PCM_HOOK_TYPE_LAST = SND_PCM_HOOK_TYPE_CLOSE
} snd_pcm_hook_type_t;
 
typedef struct _snd_pcm_hook snd_pcm_hook_t;
typedef int (*snd_pcm_hook_func_t)(snd_pcm_hook_t *hook);
snd_pcm_t *snd_pcm_hook_get_pcm(snd_pcm_hook_t *hook);
void *snd_pcm_hook_get_private(snd_pcm_hook_t *hook);
void snd_pcm_hook_set_private(snd_pcm_hook_t *hook, void *private_data);
int snd_pcm_hook_add(snd_pcm_hook_t **hookp, snd_pcm_t *pcm,
             snd_pcm_hook_type_t type,
             snd_pcm_hook_func_t func, void *private_data);
int snd_pcm_hook_remove(snd_pcm_hook_t *hook);
 
typedef struct _snd_pcm_scope_ops {
    int (*enable)(snd_pcm_scope_t *scope);
    void (*disable)(snd_pcm_scope_t *scope);
    void (*start)(snd_pcm_scope_t *scope);
    void (*stop)(snd_pcm_scope_t *scope);
    void (*update)(snd_pcm_scope_t *scope);
    void (*reset)(snd_pcm_scope_t *scope);
    void (*close)(snd_pcm_scope_t *scope);
} snd_pcm_scope_ops_t;
 
snd_pcm_uframes_t snd_pcm_meter_get_bufsize(snd_pcm_t *pcm);
unsigned int snd_pcm_meter_get_channels(snd_pcm_t *pcm);
unsigned int snd_pcm_meter_get_rate(snd_pcm_t *pcm);
snd_pcm_uframes_t snd_pcm_meter_get_now(snd_pcm_t *pcm);
snd_pcm_uframes_t snd_pcm_meter_get_boundary(snd_pcm_t *pcm);
int snd_pcm_meter_add_scope(snd_pcm_t *pcm, snd_pcm_scope_t *scope);
snd_pcm_scope_t *snd_pcm_meter_search_scope(snd_pcm_t *pcm, const char *name);
int snd_pcm_scope_malloc(snd_pcm_scope_t **ptr);
void snd_pcm_scope_set_ops(snd_pcm_scope_t *scope,
               const snd_pcm_scope_ops_t *val);
void snd_pcm_scope_set_name(snd_pcm_scope_t *scope, const char *val);
const char *snd_pcm_scope_get_name(snd_pcm_scope_t *scope);
void *snd_pcm_scope_get_callback_private(snd_pcm_scope_t *scope);
void snd_pcm_scope_set_callback_private(snd_pcm_scope_t *scope, void *val);
int snd_pcm_scope_s16_open(snd_pcm_t *pcm, const char *name,
               snd_pcm_scope_t **scopep);
int16_t *snd_pcm_scope_s16_get_channel_buffer(snd_pcm_scope_t *scope,
                          unsigned int channel);
 
typedef enum _snd_spcm_latency {
    SND_SPCM_LATENCY_STANDARD = 0,
    SND_SPCM_LATENCY_MEDIUM,
    SND_SPCM_LATENCY_REALTIME
} snd_spcm_latency_t;
 
typedef enum _snd_spcm_xrun_type {
    SND_SPCM_XRUN_IGNORE = 0,
    SND_SPCM_XRUN_STOP
} snd_spcm_xrun_type_t;
 
typedef enum _snd_spcm_duplex_type {
    SND_SPCM_DUPLEX_LIBERAL = 0,
    SND_SPCM_DUPLEX_PEDANTIC
} snd_spcm_duplex_type_t;
 
int snd_spcm_init(snd_pcm_t *pcm,
          unsigned int rate,
          unsigned int channels,
          snd_pcm_format_t format,
          snd_pcm_subformat_t subformat,
          snd_spcm_latency_t latency,
          snd_pcm_access_t _access,
          snd_spcm_xrun_type_t xrun_type);
 
int snd_spcm_init_duplex(snd_pcm_t *playback_pcm,
             snd_pcm_t *capture_pcm,
             unsigned int rate,
             unsigned int channels,
             snd_pcm_format_t format,
             snd_pcm_subformat_t subformat,
             snd_spcm_latency_t latency,
             snd_pcm_access_t _access,
             snd_spcm_xrun_type_t xrun_type,
             snd_spcm_duplex_type_t duplex_type);
 
int snd_spcm_init_get_params(snd_pcm_t *pcm,
                 unsigned int *rate,
                 snd_pcm_uframes_t *buffer_size,
                 snd_pcm_uframes_t *period_size);
 
/* Deprecated functions, for compatibility */
const char *snd_pcm_start_mode_name(snd_pcm_start_t mode) __attribute__((deprecated));
const char *snd_pcm_xrun_mode_name(snd_pcm_xrun_t mode) __attribute__((deprecated));
int snd_pcm_sw_params_set_start_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_start_t val) __attribute__((deprecated));
snd_pcm_start_t snd_pcm_sw_params_get_start_mode(const snd_pcm_sw_params_t *params) __attribute__((deprecated));
int snd_pcm_sw_params_set_xrun_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_xrun_t val) __attribute__((deprecated));
snd_pcm_xrun_t snd_pcm_sw_params_get_xrun_mode(const snd_pcm_sw_params_t *params) __attribute__((deprecated));
#if !defined(ALSA_LIBRARY_BUILD) && !defined(ALSA_PCM_OLD_SW_PARAMS_API)
int snd_pcm_sw_params_set_xfer_align(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val) __attribute__((deprecated));
int snd_pcm_sw_params_get_xfer_align(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val) __attribute__((deprecated));
int snd_pcm_sw_params_set_sleep_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, unsigned int val) __attribute__((deprecated));
int snd_pcm_sw_params_get_sleep_min(const snd_pcm_sw_params_t *params, unsigned int *val) __attribute__((deprecated));
#endif /* !ALSA_LIBRARY_BUILD && !ALSA_PCM_OLD_SW_PARAMS_API */
#if !defined(ALSA_LIBRARY_BUILD) && !defined(ALSA_PCM_OLD_HW_PARAMS_API)
int snd_pcm_hw_params_get_tick_time(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_get_tick_time_min(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_get_tick_time_max(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_test_tick_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
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) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
int snd_pcm_hw_params_set_tick_time_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir) __attribute__((deprecated));
#endif /* !ALSA_LIBRARY_BUILD && !ALSA_PCM_OLD_HW_PARAMS_API */
 
#ifdef __cplusplus
}
#endif
 
#endif /* __ALSA_PCM_H */