Personal Computer World 2009 February/PCWFEB09.iso/Software/Linux/SLAX 6.0.8/slax-6.0.8.iso/slax/base/006-devel.lzm/usr/include/alsa/pcm.h

C/C++ Source or Header | 2008-09-18 | 50.1 KB | 1,137 lines

/**
 * \file include/pcm.h
 * \brief Application interface library for the ALSA driver
 * \author Jaroslav Kysela <[e-mail]>
 * \author Abramo Bagnara <[e-mail]>
 * \author Takashi Iwai <[e-mail]>
 * \date 1998-2001
 *
 * Application interface library for the ALSA driver.
 * See the \ref pcm page for more details.
 */
/*
 *   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#ifndef __ALSA_PCM_H
#define __ALSA_PCM_H

#ifdef __cplusplus
extern "C" {
#endif

/**
 *  \defgroup PCM PCM Interface
 *  See the \ref pcm page for more details.
 *  \{
 */

/** dlsym version for interface entry callback */
#define SND_PCM_DLSYM_VERSION        _dlsym_pcm_001

/** PCM generic info container */
typedef struct _snd_pcm_info snd_pcm_info_t;
/** PCM hardware configuration space container */
typedef struct _snd_pcm_hw_params snd_pcm_hw_params_t;
/** PCM software configuration container */
typedef struct _snd_pcm_sw_params snd_pcm_sw_params_t;
/** PCM status container */
 typedef struct _snd_pcm_status snd_pcm_status_t;
/** PCM access types mask */
typedef struct _snd_pcm_access_mask snd_pcm_access_mask_t;
/** PCM formats mask */
typedef struct _snd_pcm_format_mask snd_pcm_format_mask_t;
/** PCM subformats mask */
typedef struct _snd_pcm_subformat_mask snd_pcm_subformat_mask_t;

/** PCM class */
typedef enum _snd_pcm_class {
    /** standard device */

    SND_PCM_CLASS_GENERIC = 0,
    /** multichannel device */
    SND_PCM_CLASS_MULTI,
    /** software modem device */
    SND_PCM_CLASS_MODEM,
    /** digitizer device */
    SND_PCM_CLASS_DIGITIZER,
    SND_PCM_CLASS_LAST = SND_PCM_CLASS_DIGITIZER
} snd_pcm_class_t;

/** PCM subclass */
typedef enum _snd_pcm_subclass {
    /** subdevices are mixed together */
    SND_PCM_SUBCLASS_GENERIC_MIX = 0,
    /** multichannel subdevices are mixed together */
    SND_PCM_SUBCLASS_MULTI_MIX,
    SND_PCM_SUBCLASS_LAST = SND_PCM_SUBCLASS_MULTI_MIX
} snd_pcm_subclass_t;

/** PCM stream (direction) */
typedef enum _snd_pcm_stream {
    /** Playback stream */
    SND_PCM_STREAM_PLAYBACK = 0,
    /** Capture stream */
    SND_PCM_STREAM_CAPTURE,
    SND_PCM_STREAM_LAST = SND_PCM_STREAM_CAPTURE
} snd_pcm_stream_t;

/** PCM access type */
typedef enum _snd_pcm_access {
    /** mmap access with simple interleaved channels */
    SND_PCM_ACCESS_MMAP_INTERLEAVED = 0,
    /** mmap access with simple non interleaved channels */
    SND_PCM_ACCESS_MMAP_NONINTERLEAVED,
    /** mmap access with complex placement */
    SND_PCM_ACCESS_MMAP_COMPLEX,
    /** snd_pcm_readi/snd_pcm_writei access */
    SND_PCM_ACCESS_RW_INTERLEAVED,
    /** snd_pcm_readn/snd_pcm_writen access */
    SND_PCM_ACCESS_RW_NONINTERLEAVED,
    SND_PCM_ACCESS_LAST = SND_PCM_ACCESS_RW_NONINTERLEAVED
} snd_pcm_access_t;

/** PCM sample format */
typedef enum _snd_pcm_format {
    /** Unknown */
    SND_PCM_FORMAT_UNKNOWN = -1,
    /** Signed 8 bit */
    SND_PCM_FORMAT_S8 = 0,
    /** Unsigned 8 bit */
    SND_PCM_FORMAT_U8,
    /** Signed 16 bit Little Endian */
    SND_PCM_FORMAT_S16_LE,
    /** Signed 16 bit Big Endian */
    SND_PCM_FORMAT_S16_BE,
    /** Unsigned 16 bit Little Endian */
    SND_PCM_FORMAT_U16_LE,
    /** Unsigned 16 bit Big Endian */
    SND_PCM_FORMAT_U16_BE,
    /** Signed 24 bit Little Endian using low three bytes in 32-bit word */
    SND_PCM_FORMAT_S24_LE,
    /** Signed 24 bit Big Endian using low three bytes in 32-bit word */
    SND_PCM_FORMAT_S24_BE,
    /** Unsigned 24 bit Little Endian using low three bytes in 32-bit word */
    SND_PCM_FORMAT_U24_LE,
    /** Unsigned 24 bit Big Endian using low three bytes in 32-bit word */
    SND_PCM_FORMAT_U24_BE,
    /** Signed 32 bit Little Endian */
    SND_PCM_FORMAT_S32_LE,
    /** Signed 32 bit Big Endian */
    SND_PCM_FORMAT_S32_BE,
    /** Unsigned 32 bit Little Endian */
    SND_PCM_FORMAT_U32_LE,
    /** Unsigned 32 bit Big Endian */
    SND_PCM_FORMAT_U32_BE,
    /** Float 32 bit Little Endian, Range -1.0 to 1.0 */
    SND_PCM_FORMAT_FLOAT_LE,
    /** Float 32 bit Big Endian, Range -1.0 to 1.0 */
    SND_PCM_FORMAT_FLOAT_BE,
    /** Float 64 bit Little Endian, Range -1.0 to 1.0 */
    SND_PCM_FORMAT_FLOAT64_LE,
    /** Float 64 bit Big Endian, Range -1.0 to 1.0 */
    SND_PCM_FORMAT_FLOAT64_BE,
    /** IEC-958 Little Endian */
    SND_PCM_FORMAT_IEC958_SUBFRAME_LE,
    /** IEC-958 Big Endian */
    SND_PCM_FORMAT_IEC958_SUBFRAME_BE,
    /** Mu-Law */
    SND_PCM_FORMAT_MU_LAW,
    /** A-Law */
    SND_PCM_FORMAT_A_LAW,
    /** Ima-ADPCM */
    SND_PCM_FORMAT_IMA_ADPCM,
    /** MPEG */
    SND_PCM_FORMAT_MPEG,
    /** GSM */
    SND_PCM_FORMAT_GSM,
    /** Special */
    SND_PCM_FORMAT_SPECIAL = 31,
    /** Signed 24bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_S24_3LE = 32,
    /** Signed 24bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_S24_3BE,
    /** Unsigned 24bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_U24_3LE,
    /** Unsigned 24bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_U24_3BE,
    /** Signed 20bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_S20_3LE,
    /** Signed 20bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_S20_3BE,
    /** Unsigned 20bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_U20_3LE,
    /** Unsigned 20bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_U20_3BE,
    /** Signed 18bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_S18_3LE,
    /** Signed 18bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_S18_3BE,
    /** Unsigned 18bit Little Endian in 3bytes format */
    SND_PCM_FORMAT_U18_3LE,
    /** Unsigned 18bit Big Endian in 3bytes format */
    SND_PCM_FORMAT_U18_3BE,
    SND_PCM_FORMAT_LAST = SND_PCM_FORMAT_U18_3BE,

#if __BYTE_ORDER == __LITTLE_ENDIAN
    /** Signed 16 bit CPU endian */
    SND_PCM_FORMAT_S16 = SND_PCM_FORMAT_S16_LE,
    /** Unsigned 16 bit CPU endian */
    SND_PCM_FORMAT_U16 = SND_PCM_FORMAT_U16_LE,
    /** Signed 24 bit CPU endian */
    SND_PCM_FORMAT_S24 = SND_PCM_FORMAT_S24_LE,
    /** Unsigned 24 bit CPU endian */
    SND_PCM_FORMAT_U24 = SND_PCM_FORMAT_U24_LE,
    /** Signed 32 bit CPU endian */
    SND_PCM_FORMAT_S32 = SND_PCM_FORMAT_S32_LE,
    /** Unsigned 32 bit CPU endian */
    SND_PCM_FORMAT_U32 = SND_PCM_FORMAT_U32_LE,
    /** Float 32 bit CPU endian */
    SND_PCM_FORMAT_FLOAT = SND_PCM_FORMAT_FLOAT_LE,
    /** Float 64 bit CPU endian */
    SND_PCM_FORMAT_FLOAT64 = SND_PCM_FORMAT_FLOAT64_LE,
    /** IEC-958 CPU Endian */
    SND_PCM_FORMAT_IEC958_SUBFRAME = SND_PCM_FORMAT_IEC958_SUBFRAME_LE
#elif __BYTE_ORDER == __BIG_ENDIAN
    /** Signed 16 bit CPU endian */
    SND_PCM_FORMAT_S16 = SND_PCM_FORMAT_S16_BE,
    /** Unsigned 16 bit CPU endian */
    SND_PCM_FORMAT_U16 = SND_PCM_FORMAT_U16_BE,
    /** Signed 24 bit CPU endian */
    SND_PCM_FORMAT_S24 = SND_PCM_FORMAT_S24_BE,
    /** Unsigned 24 bit CPU endian */
    SND_PCM_FORMAT_U24 = SND_PCM_FORMAT_U24_BE,
    /** Signed 32 bit CPU endian */
    SND_PCM_FORMAT_S32 = SND_PCM_FORMAT_S32_BE,
    /** Unsigned 32 bit CPU endian */
    SND_PCM_FORMAT_U32 = SND_PCM_FORMAT_U32_BE,
    /** Float 32 bit CPU endian */
    SND_PCM_FORMAT_FLOAT = SND_PCM_FORMAT_FLOAT_BE,
    /** Float 64 bit CPU endian */
    SND_PCM_FORMAT_FLOAT64 = SND_PCM_FORMAT_FLOAT64_BE,
    /** IEC-958 CPU Endian */
    SND_PCM_FORMAT_IEC958_SUBFRAME = SND_PCM_FORMAT_IEC958_SUBFRAME_BE
#else
#error "Unknown endian"
#endif
} snd_pcm_format_t;

/** PCM sample subformat */
typedef enum _snd_pcm_subformat {
    /** Standard */
    SND_PCM_SUBFORMAT_STD = 0,
    SND_PCM_SUBFORMAT_LAST = SND_PCM_SUBFORMAT_STD
} snd_pcm_subformat_t;

/** PCM state */
typedef enum _snd_pcm_state {
    /** Open */
    SND_PCM_STATE_OPEN = 0,
    /** Setup installed */
    SND_PCM_STATE_SETUP,
    /** Ready to start */
    SND_PCM_STATE_PREPARED,
    /** Running */
    SND_PCM_STATE_RUNNING,
    /** Stopped: underrun (playback) or overrun (capture) detected */
    SND_PCM_STATE_XRUN,
    /** Draining: running (playback) or stopped (capture) */
    SND_PCM_STATE_DRAINING,
    /** Paused */
    SND_PCM_STATE_PAUSED,
    /** Hardware is suspended */
    SND_PCM_STATE_SUSPENDED,
    /** Hardware is disconnected */
    SND_PCM_STATE_DISCONNECTED,
    SND_PCM_STATE_LAST = SND_PCM_STATE_DISCONNECTED
} snd_pcm_state_t;

/** PCM start mode */
typedef enum _snd_pcm_start {
    /** Automatic start on data read/write */
    SND_PCM_START_DATA = 0,
    /** Explicit start */
    SND_PCM_START_EXPLICIT,
    SND_PCM_START_LAST = SND_PCM_START_EXPLICIT
} snd_pcm_start_t;

/** PCM xrun mode */
typedef enum _snd_pcm_xrun {
    /** Xrun detection disabled */
    SND_PCM_XRUN_NONE = 0,
    /** Stop on xrun detection */
    SND_PCM_XRUN_STOP,
    SND_PCM_XRUN_LAST = SND_PCM_XRUN_STOP
} snd_pcm_xrun_t;

/** PCM timestamp mode */
typedef enum _snd_pcm_tstamp {
    /** No timestamp */
    SND_PCM_TSTAMP_NONE = 0,
    /** Update timestamp at every hardware position update */
    SND_PCM_TSTAMP_ENABLE,
    /** Equivalent with #SND_PCM_TSTAMP_ENABLE,
     * just for compatibility with older versions
     */
    SND_PCM_TSTAMP_MMAP = SND_PCM_TSTAMP_ENABLE,
    SND_PCM_TSTAMP_LAST = SND_PCM_TSTAMP_ENABLE
} snd_pcm_tstamp_t;

/** Unsigned frames quantity */
typedef unsigned long snd_pcm_uframes_t;
/** Signed frames quantity */
typedef long snd_pcm_sframes_t;

/** Non blocking mode (flag for open mode) \hideinitializer */
#define SND_PCM_NONBLOCK        0x00000001
/** Async notification (flag for open mode) \hideinitializer */
#define SND_PCM_ASYNC            0x00000002
/** Disable automatic (but not forced!) rate resamplinig */
#define SND_PCM_NO_AUTO_RESAMPLE    0x00010000
/** Disable automatic (but not forced!) channel conversion */
#define SND_PCM_NO_AUTO_CHANNELS    0x00020000
/** Disable automatic (but not forced!) format conversion */
#define SND_PCM_NO_AUTO_FORMAT        0x00040000
/** Disable soft volume control */
#define SND_PCM_NO_SOFTVOL        0x00080000

/** PCM handle */
typedef struct _snd_pcm snd_pcm_t;

/** PCM type */
enum _snd_pcm_type {
    /** Kernel level PCM */
    SND_PCM_TYPE_HW = 0,
    /** Hooked PCM */
    SND_PCM_TYPE_HOOKS,
    /** One or more linked PCM with exclusive access to selected
        channels */
    SND_PCM_TYPE_MULTI,
    /** File writing plugin */
    SND_PCM_TYPE_FILE,
    /** Null endpoint PCM */
    SND_PCM_TYPE_NULL,
    /** Shared memory client PCM */
    SND_PCM_TYPE_SHM,
    /** INET client PCM (not yet implemented) */
    SND_PCM_TYPE_INET,
    /** Copying plugin */
    SND_PCM_TYPE_COPY,
    /** Linear format conversion PCM */
    SND_PCM_TYPE_LINEAR,
    /** A-Law format conversion PCM */
    SND_PCM_TYPE_ALAW,
    /** Mu-Law format conversion PCM */
    SND_PCM_TYPE_MULAW,
    /** IMA-ADPCM format conversion PCM */
    SND_PCM_TYPE_ADPCM,
    /** Rate conversion PCM */
    SND_PCM_TYPE_RATE,
    /** Attenuated static route PCM */
    SND_PCM_TYPE_ROUTE,
    /** Format adjusted PCM */
    SND_PCM_TYPE_PLUG,
    /** Sharing PCM */
    SND_PCM_TYPE_SHARE,
    /** Meter plugin */
    SND_PCM_TYPE_METER,
    /** Mixing PCM */
    SND_PCM_TYPE_MIX,
    /** Attenuated dynamic route PCM (not yet implemented) */
    SND_PCM_TYPE_DROUTE,
    /** Loopback server plugin (not yet implemented) */
    SND_PCM_TYPE_LBSERVER,
    /** Linear Integer <-> Linear Float format conversion PCM */
    SND_PCM_TYPE_LINEAR_FLOAT,
    /** LADSPA integration plugin */
    SND_PCM_TYPE_LADSPA,
    /** Direct Mixing plugin */
    SND_PCM_TYPE_DMIX,
    /** Jack Audio Connection Kit plugin */
    SND_PCM_TYPE_JACK,
    /** Direct Snooping plugin */
    SND_PCM_TYPE_DSNOOP,
    /** Direct Sharing plugin */
    SND_PCM_TYPE_DSHARE,
    /** IEC958 subframe plugin */
    SND_PCM_TYPE_IEC958,
    /** Soft volume plugin */
    SND_PCM_TYPE_SOFTVOL,
    /** External I/O plugin */
    SND_PCM_TYPE_IOPLUG,
    /** External filter plugin */
    SND_PCM_TYPE_EXTPLUG,
    /** Mmap-emulation plugin */
    SND_PCM_TYPE_MMAP_EMUL,
    SND_PCM_TYPE_LAST = SND_PCM_TYPE_MMAP_EMUL
};

/** PCM type */
typedef enum _snd_pcm_type snd_pcm_type_t;

/** PCM area specification */
typedef struct _snd_pcm_channel_area {
    /** base address of channel samples */
    void *addr;
    /** offset to first sample in bits */
    unsigned int first;
    /** samples distance in bits */
    unsigned int step;
} snd_pcm_channel_area_t;

/** PCM synchronization ID */
typedef union _snd_pcm_sync_id {
    /** 8-bit ID */
    unsigned char id[16];
    /** 16-bit ID */
    unsigned short id16[8];
    /** 32-bit ID */
    unsigned int id32[4];
} snd_pcm_sync_id_t;

/** #SND_PCM_TYPE_METER scope handle */
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_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);
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_update(snd_pcm_t *pcm);
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);

/*
 * 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);

/** \} */

/**
 * \defgroup PCM_Info Stream Information
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_info_sizeof(void);
/** \hideinitializer
 * \brief allocate an invalid #snd_pcm_info_t using standard alloca
 * \param ptr returned pointer
 */
#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);

/** \} */

/**
 * \defgroup PCM_HW_Params Hardware Parameters
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

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_forward(const snd_pcm_hw_params_t *params);
int snd_pcm_hw_params_can_rewind(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_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);
/** \hideinitializer
 * \brief allocate an invalid #snd_pcm_hw_params_t using standard alloca
 * \param ptr returned pointer
 */
#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_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);

/** \} */

/**
 * \defgroup PCM_SW_Params Software Parameters
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_sw_params_sizeof(void);
/** \hideinitializer
 * \brief allocate an invalid #snd_pcm_sw_params_t using standard alloca
 * \param ptr returned pointer
 */
#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_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

/**
 * \defgroup PCM_Access Access Mask Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_access_mask_sizeof(void);
/** \hideinitializer
 * \brief allocate an empty #snd_pcm_access_mask_t using standard alloca
 * \param ptr returned pointer
 */
#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);

/** \} */

/**
 * \defgroup PCM_Format Format Mask Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_format_mask_sizeof(void);
/** \hideinitializer
 * \brief allocate an empty #snd_pcm_format_mask_t using standard alloca
 * \param ptr returned pointer
 */
#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);

/** \} */

/**
 * \defgroup PCM_SubFormat Subformat Mask Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_subformat_mask_sizeof(void);
/** \hideinitializer
 * \brief allocate an empty #snd_pcm_subformat_mask_t using standard alloca
 * \param ptr returned pointer
 */
#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);

/** \} */

/**
 * \defgroup PCM_Status Status Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

size_t snd_pcm_status_sizeof(void);
/** \hideinitializer
 * \brief allocate an invalid #snd_pcm_status_t using standard alloca
 * \param ptr returned pointer
 */
#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);
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);

/** \} */

/**
 * \defgroup PCM_Description Description Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

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);

/** \} */

/**
 * \defgroup PCM_Dump Debug Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

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);

/** \} */

/**
 * \defgroup PCM_Direct Direct Access (MMAP) Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

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);

/** \} */

/**
 * \defgroup PCM_Helpers Helper Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

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);
u_int8_t snd_pcm_format_silence(snd_pcm_format_t format);
u_int16_t snd_pcm_format_silence_16(snd_pcm_format_t format);
u_int32_t snd_pcm_format_silence_32(snd_pcm_format_t format);
u_int64_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);

/** \} */

/**
 * \defgroup PCM_Hook Hook Extension
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** type of pcm hook */
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;

/** PCM hook container */
typedef struct _snd_pcm_hook snd_pcm_hook_t;
/** PCM hook callback function */
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);

/** \} */

/**
 * \defgroup PCM_Scope Scope Plugin Extension
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** #SND_PCM_TYPE_METER scope functions */
typedef struct _snd_pcm_scope_ops {
    /** \brief Enable and prepare it using current params
     * \param scope scope handle
     */
    int (*enable)(snd_pcm_scope_t *scope);
    /** \brief Disable
     * \param scope scope handle
     */
    void (*disable)(snd_pcm_scope_t *scope);
    /** \brief PCM has been started
     * \param scope scope handle
     */
    void (*start)(snd_pcm_scope_t *scope);
    /** \brief PCM has been stopped
     * \param scope scope handle
     */
    void (*stop)(snd_pcm_scope_t *scope);
    /** \brief New frames are present
     * \param scope scope handle
     */
    void (*update)(snd_pcm_scope_t *scope);
    /** \brief Reset status
     * \param scope scope handle
     */
    void (*reset)(snd_pcm_scope_t *scope);
    /** \brief PCM is closing
     * \param scope scope handle
     */
    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, 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);

/** \} */

/**
 * \defgroup PCM_Simple Simple setup functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/** Simple PCM latency type */
typedef enum _snd_spcm_latency {
    /** standard latency - for standard playback or capture
            (estimated latency in one direction 350ms) */
    SND_SPCM_LATENCY_STANDARD = 0,
    /** medium latency - software phones etc.
        (estimated latency in one direction maximally 25ms */
    SND_SPCM_LATENCY_MEDIUM,
    /** realtime latency - realtime applications (effect processors etc.)
        (estimated latency in one direction 5ms and better) */
    SND_SPCM_LATENCY_REALTIME
} snd_spcm_latency_t;

/** Simple PCM xrun type */
typedef enum _snd_spcm_xrun_type {
    /** driver / library will ignore all xruns, the stream runs forever */
    SND_SPCM_XRUN_IGNORE = 0,
    /** driver / library stops the stream when an xrun occurs */
    SND_SPCM_XRUN_STOP
} snd_spcm_xrun_type_t;

/** Simple PCM duplex type */
typedef enum _snd_spcm_duplex_type {
    /** liberal duplex - the buffer and period sizes might not match */
    SND_SPCM_DUPLEX_LIBERAL = 0,
    /** pedantic duplex - the buffer and period sizes MUST match */
    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);

/** \} */

/**
 * \defgroup PCM_Deprecated Deprecated Functions
 * \ingroup PCM
 * See the \ref pcm page for more details.
 * \{
 */

/* 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 */