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pcm_local.h

/*
 *  PCM Interface - local header file
 *  Copyright (c) 2000 by Jaroslav Kysela <perex@suse.cz>
 *                        Abramo Bagnara <abramo@alsa-project.org>
 *
 *
 *   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
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/uio.h>

#define _snd_mask sndrv_mask
#define _snd_pcm_access_mask _snd_mask
#define _snd_pcm_format_mask _snd_mask
#define _snd_pcm_subformat_mask _snd_mask

#include "local.h"

#define SND_INTERVAL_INLINE
#include "interval.h"

#define SND_MASK_INLINE
#include "mask.h"

typedef enum sndrv_pcm_hw_param snd_pcm_hw_param_t;
#define SND_PCM_HW_PARAM_ACCESS SNDRV_PCM_HW_PARAM_ACCESS
#define SND_PCM_HW_PARAM_FIRST_MASK SNDRV_PCM_HW_PARAM_FIRST_MASK
#define SND_PCM_HW_PARAM_FORMAT SNDRV_PCM_HW_PARAM_FORMAT
#define SND_PCM_HW_PARAM_SUBFORMAT SNDRV_PCM_HW_PARAM_SUBFORMAT
#define SND_PCM_HW_PARAM_LAST_MASK SNDRV_PCM_HW_PARAM_LAST_MASK
#define SND_PCM_HW_PARAM_SAMPLE_BITS SNDRV_PCM_HW_PARAM_SAMPLE_BITS
#define SND_PCM_HW_PARAM_FIRST_INTERVAL SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
#define SND_PCM_HW_PARAM_FRAME_BITS SNDRV_PCM_HW_PARAM_FRAME_BITS
#define SND_PCM_HW_PARAM_CHANNELS SNDRV_PCM_HW_PARAM_CHANNELS
#define SND_PCM_HW_PARAM_RATE SNDRV_PCM_HW_PARAM_RATE
#define SND_PCM_HW_PARAM_PERIOD_TIME SNDRV_PCM_HW_PARAM_PERIOD_TIME
#define SND_PCM_HW_PARAM_PERIOD_SIZE SNDRV_PCM_HW_PARAM_PERIOD_SIZE
#define SND_PCM_HW_PARAM_PERIOD_BYTES SNDRV_PCM_HW_PARAM_PERIOD_BYTES
#define SND_PCM_HW_PARAM_PERIODS SNDRV_PCM_HW_PARAM_PERIODS
#define SND_PCM_HW_PARAM_BUFFER_TIME SNDRV_PCM_HW_PARAM_BUFFER_TIME
#define SND_PCM_HW_PARAM_BUFFER_SIZE SNDRV_PCM_HW_PARAM_BUFFER_SIZE
#define SND_PCM_HW_PARAM_BUFFER_BYTES SNDRV_PCM_HW_PARAM_BUFFER_BYTES
#define SND_PCM_HW_PARAM_TICK_TIME SNDRV_PCM_HW_PARAM_TICK_TIME
#define SND_PCM_HW_PARAM_LAST_INTERVAL SNDRV_PCM_HW_PARAM_LAST_INTERVAL
#define SND_PCM_HW_PARAM_LAST_MASK SNDRV_PCM_HW_PARAM_LAST_MASK
#define SND_PCM_HW_PARAM_FIRST_MASK SNDRV_PCM_HW_PARAM_FIRST_MASK
#define SND_PCM_HW_PARAM_LAST_INTERVAL SNDRV_PCM_HW_PARAM_LAST_INTERVAL
#define SND_PCM_HW_PARAM_FIRST_INTERVAL SNDRV_PCM_HW_PARAM_FIRST_INTERVAL

/** device accepts mmaped access */
#define SND_PCM_INFO_MMAP SNDRV_PCM_INFO_MMAP
/** device accepts  mmaped access with sample resolution */
#define SND_PCM_INFO_MMAP_VALID SNDRV_PCM_INFO_MMAP_VALID
/** device is doing double buffering */
#define SND_PCM_INFO_DOUBLE SNDRV_PCM_INFO_DOUBLE
/** device transfers samples in batch */
#define SND_PCM_INFO_BATCH SNDRV_PCM_INFO_BATCH
/** device accepts interleaved samples */
#define SND_PCM_INFO_INTERLEAVED SNDRV_PCM_INFO_INTERLEAVED
/** device accepts non-interleaved samples */
#define SND_PCM_INFO_NONINTERLEAVED SNDRV_PCM_INFO_NONINTERLEAVED
/** device accepts complex sample organization */
#define SND_PCM_INFO_COMPLEX SNDRV_PCM_INFO_COMPLEX
/** device is capable block transfers */
#define SND_PCM_INFO_BLOCK_TRANSFER SNDRV_PCM_INFO_BLOCK_TRANSFER
/** device can detect DAC/ADC overrange */
#define SND_PCM_INFO_OVERRANGE SNDRV_PCM_INFO_OVERRANGE
/** device supports resume */
#define SND_PCM_INFO_RESUME SNDRV_PCM_INFO_RESUME
/** device is capable to pause */
#define SND_PCM_INFO_PAUSE SNDRV_PCM_INFO_PAUSE
/** device can do only half duplex */
#define SND_PCM_INFO_HALF_DUPLEX SNDRV_PCM_INFO_HALF_DUPLEX
/** device can do only joint duplex (same parameters) */
#define SND_PCM_INFO_JOINT_DUPLEX SNDRV_PCM_INFO_JOINT_DUPLEX
/** device can do a kind of synchronized start */
#define SND_PCM_INFO_SYNC_START SNDRV_PCM_INFO_SYNC_START

#define SND_PCM_HW_PARAMS_NORESAMPLE SNDRV_PCM_HW_PARAMS_NORESAMPLE
#define SND_PCM_HW_PARAMS_EXPORT_BUFFER SNDRV_PCM_HW_PARAMS_EXPORT_BUFFER

00098 typedef struct _snd_pcm_rbptr {
      snd_pcm_t *master;
      volatile snd_pcm_uframes_t *ptr;
      int fd;
      off_t offset;
      int link_dst_count;
      snd_pcm_t **link_dst;
      void *private_data;
      void (*changed)(snd_pcm_t *pcm, snd_pcm_t *src);
} snd_pcm_rbptr_t;

00109 typedef struct _snd_pcm_channel_info {
      unsigned int channel;
      void *addr;             /* base address of channel samples */
      unsigned int first;           /* offset to first sample in bits */
      unsigned int step;            /* samples distance in bits */
      enum { SND_PCM_AREA_SHM, SND_PCM_AREA_MMAP, SND_PCM_AREA_LOCAL } type;
      union {
            struct {
                  struct snd_shm_area *area;
                  int shmid;
            } shm;
            struct {
                  int fd;
                  off_t offset;
            } mmap;
      } u;
      char reserved[64];
} snd_pcm_channel_info_t;

00128 typedef struct {
      int (*close)(snd_pcm_t *pcm);
      int (*nonblock)(snd_pcm_t *pcm, int nonblock);
      int (*async)(snd_pcm_t *pcm, int sig, pid_t pid);
      int (*info)(snd_pcm_t *pcm, snd_pcm_info_t *info);
      int (*hw_refine)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
      int (*hw_params)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
      int (*hw_free)(snd_pcm_t *pcm);
      int (*sw_params)(snd_pcm_t *pcm, snd_pcm_sw_params_t *params);
      int (*channel_info)(snd_pcm_t *pcm, snd_pcm_channel_info_t *info);
      void (*dump)(snd_pcm_t *pcm, snd_output_t *out);
      int (*mmap)(snd_pcm_t *pcm);
      int (*munmap)(snd_pcm_t *pcm);
} snd_pcm_ops_t;

00143 typedef struct {
      int (*status)(snd_pcm_t *pcm, snd_pcm_status_t *status);
      int (*prepare)(snd_pcm_t *pcm);
      int (*reset)(snd_pcm_t *pcm);
      int (*start)(snd_pcm_t *pcm);
      int (*drop)(snd_pcm_t *pcm);
      int (*drain)(snd_pcm_t *pcm);
      int (*pause)(snd_pcm_t *pcm, int enable);
      snd_pcm_state_t (*state)(snd_pcm_t *pcm);
      int (*hwsync)(snd_pcm_t *pcm);
      int (*delay)(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp);
      int (*resume)(snd_pcm_t *pcm);
      int (*link_fd)(snd_pcm_t *pcm, int *fds, int count, int (**failed)(snd_pcm_t *, int));
      int (*link)(snd_pcm_t *pcm1, snd_pcm_t *pcm2);
      int (*unlink)(snd_pcm_t *pcm);
      snd_pcm_sframes_t (*rewind)(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
      snd_pcm_sframes_t (*forward)(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
      snd_pcm_sframes_t (*writei)(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size);
      snd_pcm_sframes_t (*writen)(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
      snd_pcm_sframes_t (*readi)(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size);
      snd_pcm_sframes_t (*readn)(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size);
      snd_pcm_sframes_t (*avail_update)(snd_pcm_t *pcm);
      snd_pcm_sframes_t (*mmap_commit)(snd_pcm_t *pcm, snd_pcm_uframes_t offset, snd_pcm_uframes_t size);
      int (*poll_descriptors_count)(snd_pcm_t *pcm);
      int (*poll_descriptors)(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space);
      int (*poll_revents)(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents);
} snd_pcm_fast_ops_t;

00171 struct _snd_pcm {
      void *dl_handle;
      char *name;
      snd_pcm_type_t type;
      snd_pcm_stream_t stream;
      int mode;
      int poll_fd_count;
      int poll_fd;
      unsigned short poll_events;
      int setup;
      snd_pcm_access_t access;      /* access mode */
      snd_pcm_format_t format;      /* SND_PCM_FORMAT_* */
      snd_pcm_subformat_t subformat;      /* subformat */
      unsigned int channels;        /* channels */
      unsigned int rate;            /* rate in Hz */
      snd_pcm_uframes_t period_size;
      unsigned int period_time;     /* period duration */
      snd_interval_t periods;
      unsigned int tick_time;
      snd_pcm_tstamp_t tstamp_mode; /* timestamp mode */
      unsigned int period_step;
      unsigned int sleep_min;
      snd_pcm_uframes_t avail_min;  /* min avail frames for wakeup */
      snd_pcm_uframes_t start_threshold;  
      snd_pcm_uframes_t stop_threshold;   
      snd_pcm_uframes_t silence_threshold;      /* Silence filling happens when
                                 noise is nearest than this */
      snd_pcm_uframes_t silence_size;     /* Silence filling size */
      snd_pcm_uframes_t xfer_align; /* xfer size need to be a multiple */
      snd_pcm_uframes_t boundary;   /* pointers wrap point */
      unsigned int info;            /* Info for returned setup */
      unsigned int msbits;          /* used most significant bits */
      unsigned int rate_num;        /* rate numerator */
      unsigned int rate_den;        /* rate denominator */
      unsigned int hw_flags;        /* actual hardware flags */
      snd_pcm_uframes_t fifo_size;  /* chip FIFO size in frames */
      snd_pcm_uframes_t buffer_size;
      snd_interval_t buffer_time;
      unsigned int sample_bits;
      unsigned int frame_bits;
      snd_pcm_rbptr_t appl;
      snd_pcm_rbptr_t hw;
      snd_pcm_uframes_t min_align;
      unsigned int mmap_rw: 1;      /* use always mmapped buffer */
      unsigned int mmap_shadow: 1;  /* don't call actual mmap,
                               * use the mmaped buffer of the slave
                               */
      unsigned int donot_close: 1;  /* don't close this PCM */
      snd_pcm_channel_info_t *mmap_channels;
      snd_pcm_channel_area_t *running_areas;
      snd_pcm_channel_area_t *stopped_areas;
      snd_pcm_ops_t *ops;
      snd_pcm_fast_ops_t *fast_ops;
      snd_pcm_t *op_arg;
      snd_pcm_t *fast_op_arg;
      void *private_data;
      struct list_head async_handlers;
};

int snd_pcm_new(snd_pcm_t **pcmp, snd_pcm_type_t type, const char *name,
            snd_pcm_stream_t stream, int mode);
int snd_pcm_free(snd_pcm_t *pcm);

void snd_pcm_areas_from_buf(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void *buf);
void snd_pcm_areas_from_bufs(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void **bufs);

int snd_pcm_async(snd_pcm_t *pcm, int sig, pid_t pid);
int snd_pcm_mmap(snd_pcm_t *pcm);
int snd_pcm_munmap(snd_pcm_t *pcm);
int snd_pcm_mmap_ready(snd_pcm_t *pcm);
void snd_pcm_set_hw_ptr(snd_pcm_t *pcm, volatile snd_pcm_uframes_t *hw_ptr, int fd, off_t offset);
void snd_pcm_set_appl_ptr(snd_pcm_t *pcm, volatile snd_pcm_uframes_t *appl_ptr, int fd, off_t offset);
void snd_pcm_link_hw_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_link_appl_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_unlink_hw_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_unlink_appl_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
snd_pcm_sframes_t snd_pcm_mmap_appl_ptr(snd_pcm_t *pcm, off_t offset);
void snd_pcm_mmap_appl_backward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
void snd_pcm_mmap_appl_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
void snd_pcm_mmap_hw_backward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
void snd_pcm_mmap_hw_forward(snd_pcm_t *pcm, 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);

typedef snd_pcm_sframes_t (*snd_pcm_xfer_areas_func_t)(snd_pcm_t *pcm, 
                                           const snd_pcm_channel_area_t *areas,
                                           snd_pcm_uframes_t offset, 
                                           snd_pcm_uframes_t size);

snd_pcm_sframes_t snd_pcm_read_areas(snd_pcm_t *pcm, const snd_pcm_channel_area_t *areas,
                             snd_pcm_uframes_t offset, snd_pcm_uframes_t size,
                             snd_pcm_xfer_areas_func_t func);
snd_pcm_sframes_t snd_pcm_write_areas(snd_pcm_t *pcm, const snd_pcm_channel_area_t *areas,
                              snd_pcm_uframes_t offset, snd_pcm_uframes_t size,
                              snd_pcm_xfer_areas_func_t func);
snd_pcm_sframes_t snd_pcm_read_mmap(snd_pcm_t *pcm, snd_pcm_uframes_t size);
snd_pcm_sframes_t snd_pcm_write_mmap(snd_pcm_t *pcm, snd_pcm_uframes_t size);
static inline int snd_pcm_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *info)
{
      return pcm->ops->channel_info(pcm, info);
}
int snd_pcm_channel_info_shm(snd_pcm_t *pcm, snd_pcm_channel_info_t *info, int shmid);
int _snd_pcm_poll_descriptor(snd_pcm_t *pcm);
int _snd_pcm_link_descriptors(snd_pcm_t *pcm, int *fds, int size, int (**failed)(snd_pcm_t *, int));
#define _snd_pcm_link_descriptor _snd_pcm_poll_descriptor /* FIXME */
#define _snd_pcm_async_descriptor _snd_pcm_poll_descriptor /* FIXME */

/* handle special error cases */
static inline int snd_pcm_check_error(snd_pcm_t *pcm, int err)
{
      if (err == -EINTR) {
            switch (snd_pcm_state(pcm)) {
            case SND_PCM_STATE_XRUN:
                  return -EPIPE;
            case SND_PCM_STATE_SUSPENDED:
                  return -ESTRPIPE;
            case SND_PCM_STATE_DISCONNECTED:
                  return -ENOTTY;
            default:
                  break;
            }
      }
      return err;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_playback_avail(snd_pcm_t *pcm)
{
      snd_pcm_sframes_t avail;
      avail = *pcm->hw.ptr + pcm->buffer_size - *pcm->appl.ptr;
      if (avail < 0)
            avail += pcm->boundary;
      else if ((snd_pcm_uframes_t) avail >= pcm->boundary)
            avail -= pcm->boundary;
      return avail;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_capture_avail(snd_pcm_t *pcm)
{
      snd_pcm_sframes_t avail;
      avail = *pcm->hw.ptr - *pcm->appl.ptr;
      if (avail < 0)
            avail += pcm->boundary;
      return avail;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_avail(snd_pcm_t *pcm)
{
      if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
            return snd_pcm_mmap_playback_avail(pcm);
      else
            return snd_pcm_mmap_capture_avail(pcm);
}

static inline snd_pcm_sframes_t snd_pcm_mmap_playback_hw_avail(snd_pcm_t *pcm)
{
      return pcm->buffer_size - snd_pcm_mmap_playback_avail(pcm);
}

static inline snd_pcm_sframes_t snd_pcm_mmap_capture_hw_avail(snd_pcm_t *pcm)
{
      return pcm->buffer_size - snd_pcm_mmap_capture_avail(pcm);
}

static inline snd_pcm_sframes_t snd_pcm_mmap_hw_avail(snd_pcm_t *pcm)
{
      snd_pcm_sframes_t avail;
      avail = *pcm->hw.ptr - *pcm->appl.ptr;
      if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
            avail += pcm->buffer_size;
      if (avail < 0)
            avail += pcm->boundary;
      return pcm->buffer_size - avail;
}

static inline const snd_pcm_channel_area_t *snd_pcm_mmap_areas(snd_pcm_t *pcm)
{
      if (pcm->stopped_areas &&
          snd_pcm_state(pcm) != SND_PCM_STATE_RUNNING) 
            return pcm->stopped_areas;
      return pcm->running_areas;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_offset(snd_pcm_t *pcm)
{
        assert(pcm);
      return *pcm->appl.ptr % pcm->buffer_size;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_hw_offset(snd_pcm_t *pcm)
{
        assert(pcm);
      return *pcm->hw.ptr % pcm->buffer_size;
}

static inline snd_pcm_uframes_t snd_pcm_mmap_playback_delay(snd_pcm_t *pcm)
{
      return snd_pcm_mmap_playback_hw_avail(pcm);
}

static inline snd_pcm_uframes_t snd_pcm_mmap_capture_delay(snd_pcm_t *pcm)
{
      return snd_pcm_mmap_capture_hw_avail(pcm);
}

static inline snd_pcm_sframes_t snd_pcm_mmap_delay(snd_pcm_t *pcm)
{
      if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
            return snd_pcm_mmap_playback_delay(pcm);
      else
            return snd_pcm_mmap_capture_delay(pcm);
}

static inline void *snd_pcm_channel_area_addr(const snd_pcm_channel_area_t *area, snd_pcm_uframes_t offset)
{
      unsigned int bitofs = area->first + area->step * offset;
      assert(bitofs % 8 == 0);
      return (char *) area->addr + bitofs / 8;
}

static inline unsigned int snd_pcm_channel_area_step(const snd_pcm_channel_area_t *area)
{
      assert(area->step % 8 == 0);
      return area->step / 8;
}

static inline snd_pcm_sframes_t _snd_pcm_writei(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size)
{
      return pcm->fast_ops->writei(pcm->fast_op_arg, buffer, size);
}

static inline snd_pcm_sframes_t _snd_pcm_writen(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
      return pcm->fast_ops->writen(pcm->fast_op_arg, bufs, size);
}

static inline snd_pcm_sframes_t _snd_pcm_readi(snd_pcm_t *pcm, void *buffer, snd_pcm_uframes_t size)
{
      return pcm->fast_ops->readi(pcm->fast_op_arg, buffer, size);
}

static inline snd_pcm_sframes_t _snd_pcm_readn(snd_pcm_t *pcm, void **bufs, snd_pcm_uframes_t size)
{
      return pcm->fast_ops->readn(pcm->fast_op_arg, bufs, size);
}

static inline int muldiv(int a, int b, int c, int *r)
{
      int64_t n = (int64_t)a * b;
      int64_t v = n / c;
      if (v > INT_MAX) {
            *r = 0;
            return INT_MAX;
      }
      if (v < INT_MIN) {
            *r = 0;
            return INT_MIN;
      }
      *r = n % c;
      return v;
}

static inline int muldiv_down(int a, int b, int c)
{
      int64_t v = (int64_t)a * b / c;
      if (v > INT_MAX) {
            return INT_MAX;
      }
      if (v < INT_MIN) {
            return INT_MIN;
      }
      return v;
}

static inline int muldiv_near(int a, int b, int c)
{
      int r;
      int n = muldiv(a, b, c, &r);
      if (r >= (c + 1) / 2)
            n++;
      return n;
}

int snd_pcm_hw_refine(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_refine_soft(snd_pcm_t *pcm, snd_pcm_hw_params_t *params);
int snd_pcm_hw_refine_slave(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                      int (*cprepare)(snd_pcm_t *pcm,
                                  snd_pcm_hw_params_t *params),
                      int (*cchange)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *params,
                                 snd_pcm_hw_params_t *sparams),
                      int (*sprepare)(snd_pcm_t *pcm,
                                  snd_pcm_hw_params_t *params),
                      int (*schange)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *params,
                                 snd_pcm_hw_params_t *sparams),
                      int (*srefine)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *sparams));
int snd_pcm_hw_params_slave(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                      int (*cchange)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *params,
                                 snd_pcm_hw_params_t *sparams),
                      int (*sprepare)(snd_pcm_t *pcm,
                                  snd_pcm_hw_params_t *params),
                      int (*schange)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *params,
                                 snd_pcm_hw_params_t *sparams),
                      int (*sparams)(snd_pcm_t *pcm,
                                 snd_pcm_hw_params_t *sparams));


void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params);
void _snd_pcm_hw_param_set_empty(snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var);
int _snd_pcm_hw_param_set_interval(snd_pcm_hw_params_t *params,
                           snd_pcm_hw_param_t var,
                           const snd_interval_t *val);
int _snd_pcm_hw_param_set_mask(snd_pcm_hw_params_t *params,
                     snd_pcm_hw_param_t var, const snd_mask_t *mask);
int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
                      snd_pcm_hw_param_t var);
int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
                     snd_pcm_hw_param_t var);
int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
                    snd_pcm_hw_param_t var, unsigned int val, int dir);
static inline int _snd_pcm_hw_params_set_format(snd_pcm_hw_params_t *params,
                                    snd_pcm_format_t val)
{
      return _snd_pcm_hw_param_set(params, SND_PCM_HW_PARAM_FORMAT,
                             (unsigned long) val, 0);
}

static inline int _snd_pcm_hw_params_set_subformat(snd_pcm_hw_params_t *params,
                             snd_pcm_subformat_t val)
{
      return _snd_pcm_hw_param_set(params, SND_PCM_HW_PARAM_SUBFORMAT,
                             (unsigned long) val, 0);
}

int _snd_pcm_hw_param_set_min(snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var, unsigned int val, int dir);
int _snd_pcm_hw_param_set_max(snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var, unsigned int val, int dir);
int _snd_pcm_hw_param_set_minmax(snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var,
                         unsigned int min, int mindir,
                         unsigned int max, int maxdir);
int _snd_pcm_hw_param_refine(snd_pcm_hw_params_t *params,
                       snd_pcm_hw_param_t var,
                       const snd_pcm_hw_params_t *src);
int _snd_pcm_hw_params_refine(snd_pcm_hw_params_t *params,
                        unsigned int vars,
                        const snd_pcm_hw_params_t *src);
int snd_pcm_hw_param_refine_near(snd_pcm_t *pcm,
                         snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var,
                         const snd_pcm_hw_params_t *src);
int snd_pcm_hw_param_refine_multiple(snd_pcm_t *pcm,
                             snd_pcm_hw_params_t *params,
                             snd_pcm_hw_param_t var,
                             const snd_pcm_hw_params_t *src);
int snd_pcm_hw_param_empty(const snd_pcm_hw_params_t *params,
                     snd_pcm_hw_param_t var);
int snd_pcm_hw_param_always_eq(const snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var,
                         const snd_pcm_hw_params_t *params1);
int snd_pcm_hw_param_never_eq(const snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var,
                        const snd_pcm_hw_params_t *params1);
const snd_mask_t *snd_pcm_hw_param_get_mask(const snd_pcm_hw_params_t *params,
                                    snd_pcm_hw_param_t var);
const snd_interval_t *snd_pcm_hw_param_get_interval(const snd_pcm_hw_params_t *params,
                                          snd_pcm_hw_param_t var);

int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                   snd_pcm_hw_param_t var);
int snd_pcm_hw_param_set_integer(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                         snd_set_mode_t mode,
                         snd_pcm_hw_param_t var);
int snd_pcm_hw_param_set_first(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                         snd_pcm_hw_param_t var, unsigned int *rval, int *dir);
int snd_pcm_hw_param_set_last(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var, unsigned int *rval, int *dir);
int snd_pcm_hw_param_set_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                        snd_pcm_hw_param_t var, unsigned int *val, int *dir);
int snd_pcm_hw_param_set_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                       snd_set_mode_t mode,
                       snd_pcm_hw_param_t var,
                       unsigned int *val, int *dir);
int snd_pcm_hw_param_set_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                       snd_set_mode_t mode,
                       snd_pcm_hw_param_t var, unsigned int *val, int *dir);
int snd_pcm_hw_param_set_minmax(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                        snd_set_mode_t mode,
                        snd_pcm_hw_param_t var,
                        unsigned int *min, int *mindir,
                        unsigned int *max, int *maxdir);
int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                   snd_set_mode_t mode,
                   snd_pcm_hw_param_t var, unsigned int val, int dir);
int snd_pcm_hw_param_set_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
                        snd_set_mode_t mode,
                        snd_pcm_hw_param_t var, const snd_mask_t *mask);
int snd_pcm_hw_param_get(const snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var,
                   unsigned int *val, int *dir);
int snd_pcm_hw_param_get_min(const snd_pcm_hw_params_t *params,
                       snd_pcm_hw_param_t var,
                       unsigned int *val, int *dir);
int snd_pcm_hw_param_get_max(const snd_pcm_hw_params_t *params,
                       snd_pcm_hw_param_t var,
                       unsigned int *val, int *dir);

#ifdef INTERNAL
snd_pcm_sframes_t INTERNAL(snd_pcm_forward)(snd_pcm_t *pcm, snd_pcm_uframes_t frames);

int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_access_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t *access);
int INTERNAL(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 INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_format_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t *format);
int INTERNAL(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 INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_subformat_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_subformat_t *subformat);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_get_channels)(const snd_pcm_hw_params_t *params, unsigned int *val);
int INTERNAL(snd_pcm_hw_params_get_channels_min)(const snd_pcm_hw_params_t *params, unsigned int *val);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_channels_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int INTERNAL(snd_pcm_hw_params_set_channels_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);
int INTERNAL(snd_pcm_hw_params_set_channels_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val);

int INTERNAL(snd_pcm_hw_params_get_rate)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_rate_min)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_rate_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_rate_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_rate_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);

int INTERNAL(snd_pcm_hw_params_get_period_time)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_period_time_min)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_period_time_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_period_time_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_period_time_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);

int INTERNAL(snd_pcm_hw_params_get_period_size)(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
int INTERNAL(snd_pcm_hw_params_get_period_size_min)(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir);
int INTERNAL(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 INTERNAL(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 INTERNAL(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 INTERNAL(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 INTERNAL(snd_pcm_hw_params_get_periods)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_periods_min)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_periods_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_periods_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_get_buffer_time)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_buffer_time_min)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_buffer_time_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_buffer_time_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);

int INTERNAL(snd_pcm_hw_params_get_buffer_size)(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int INTERNAL(snd_pcm_hw_params_get_buffer_size_min)(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int INTERNAL(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 INTERNAL(snd_pcm_hw_params_set_buffer_size_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int INTERNAL(snd_pcm_hw_params_set_buffer_size_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);
int INTERNAL(snd_pcm_hw_params_set_buffer_size_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val);

int INTERNAL(snd_pcm_hw_params_get_tick_time)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_tick_time_min)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_get_tick_time_max)(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_test_tick_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_tick_time(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int dir);
int snd_pcm_hw_params_set_tick_time_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int snd_pcm_hw_params_set_tick_time_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
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);
int INTERNAL(snd_pcm_hw_params_set_tick_time_near)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_tick_time_first)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);
int INTERNAL(snd_pcm_hw_params_set_tick_time_last)(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir);

int snd_pcm_sw_params_set_tstamp_mode(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_tstamp_t val);
int INTERNAL(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_sleep_min(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, unsigned int val);
int INTERNAL(snd_pcm_sw_params_get_sleep_min)(const snd_pcm_sw_params_t *params, unsigned int *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 INTERNAL(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_xfer_align(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val);
int INTERNAL(snd_pcm_sw_params_get_xfer_align)(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *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 INTERNAL(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 INTERNAL(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 INTERNAL(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 INTERNAL(snd_pcm_sw_params_get_silence_size)(const snd_pcm_sw_params_t *params, snd_pcm_uframes_t *val);
#endif /* INTERNAL */

const char *snd_pcm_hw_param_name(snd_pcm_hw_param_t param);
void snd_pcm_hw_param_dump(const snd_pcm_hw_params_t *params,
                     snd_pcm_hw_param_t var, snd_output_t *out);
#if 0
int snd_pcm_hw_strategy_simple_near(snd_pcm_hw_strategy_t *strategy, int order,
                            snd_pcm_hw_param_t var,
                            unsigned int best,
                            unsigned int mul);
int snd_pcm_hw_strategy_simple_choices(snd_pcm_hw_strategy_t *strategy, int order,
                               snd_pcm_hw_param_t var,
                               unsigned int count,
                               snd_pcm_hw_strategy_simple_choices_list_t *choices);
#endif

#define SCONF_MANDATORY 1
#define SCONF_UNCHANGED 2

int snd_pcm_slave_conf(snd_config_t *root, snd_config_t *conf,
                   snd_config_t **pcm_conf, unsigned int count, ...);

int snd_pcm_open_slave(snd_pcm_t **pcmp, snd_config_t *root,
                   snd_config_t *conf, snd_pcm_stream_t stream,
                   int mode);
int snd_pcm_conf_generic_id(const char *id);

int snd_pcm_hw_open_fd(snd_pcm_t **pcmp, const char *name, int fd, int mmap_emulation, int sync_ptr_ioctl);

int snd_pcm_wait_nocheck(snd_pcm_t *pcm, int timeout);

#define SND_PCM_HW_PARBIT_ACCESS    (1U << SND_PCM_HW_PARAM_ACCESS)
#define SND_PCM_HW_PARBIT_FORMAT    (1U << SND_PCM_HW_PARAM_FORMAT)
#define SND_PCM_HW_PARBIT_SUBFORMAT (1U << SND_PCM_HW_PARAM_SUBFORMAT)
#define SND_PCM_HW_PARBIT_CHANNELS  (1U << SND_PCM_HW_PARAM_CHANNELS)
#define SND_PCM_HW_PARBIT_RATE            (1U << SND_PCM_HW_PARAM_RATE)
#define SND_PCM_HW_PARBIT_PERIOD_TIME     (1U << SND_PCM_HW_PARAM_PERIOD_TIME)
#define SND_PCM_HW_PARBIT_PERIOD_SIZE     (1U << SND_PCM_HW_PARAM_PERIOD_SIZE)
#define SND_PCM_HW_PARBIT_PERIODS   (1U << SND_PCM_HW_PARAM_PERIODS)
#define SND_PCM_HW_PARBIT_BUFFER_TIME     (1U << SND_PCM_HW_PARAM_BUFFER_TIME)
#define SND_PCM_HW_PARBIT_BUFFER_SIZE     (1U << SND_PCM_HW_PARAM_BUFFER_SIZE)
#define SND_PCM_HW_PARBIT_SAMPLE_BITS     (1U << SND_PCM_HW_PARAM_SAMPLE_BITS)
#define SND_PCM_HW_PARBIT_FRAME_BITS      (1U << SND_PCM_HW_PARAM_FRAME_BITS)
#define SND_PCM_HW_PARBIT_PERIOD_BYTES    (1U << SND_PCM_HW_PARAM_PERIOD_BYTES)
#define SND_PCM_HW_PARBIT_BUFFER_BYTES    (1U << SND_PCM_HW_PARAM_BUFFER_BYTES)
#define SND_PCM_HW_PARBIT_TICK_TIME (1U << SND_PCM_HW_PARAM_TICK_TIME)


#define SND_PCM_ACCBIT_MMAP { ((1U << SND_PCM_ACCESS_MMAP_INTERLEAVED) | \
                       (1U << SND_PCM_ACCESS_MMAP_NONINTERLEAVED) | \
                       (1U << SND_PCM_ACCESS_MMAP_COMPLEX)) }
#define SND_PCM_ACCBIT_MMAPI { (1U << SND_PCM_ACCESS_MMAP_INTERLEAVED) }
#define SND_PCM_ACCBIT_MMAPN { (1U << SND_PCM_ACCESS_MMAP_NONINTERLEAVED) }
#define SND_PCM_ACCBIT_MMAPC { (1U << SND_PCM_ACCESS_MMAP_COMPLEX) }

#define SND_PCM_ACCBIT_SHM { ((1U << SND_PCM_ACCESS_MMAP_INTERLEAVED) | \
                      (1U << SND_PCM_ACCESS_RW_INTERLEAVED) | \
                      (1U << SND_PCM_ACCESS_MMAP_NONINTERLEAVED) | \
                      (1U << SND_PCM_ACCESS_RW_NONINTERLEAVED)) }
#define SND_PCM_ACCBIT_SHMI { ((1U << SND_PCM_ACCESS_MMAP_INTERLEAVED) | \
                       (1U << SND_PCM_ACCESS_RW_INTERLEAVED)) }
#define SND_PCM_ACCBIT_SHMN { ((1U << SND_PCM_ACCESS_MMAP_NONINTERLEAVED) | \
                       (1U << SND_PCM_ACCESS_RW_NONINTERLEAVED)) }

#define SND_PCM_FMTBIT_LINEAR \
      { ((1U << SND_PCM_FORMAT_S8) | \
       (1U << SND_PCM_FORMAT_U8) | \
       (1U << SND_PCM_FORMAT_S16_LE) | \
       (1U << SND_PCM_FORMAT_S16_BE) | \
       (1U << SND_PCM_FORMAT_U16_LE) | \
       (1U << SND_PCM_FORMAT_U16_BE) | \
       (1U << SND_PCM_FORMAT_S24_LE) | \
       (1U << SND_PCM_FORMAT_S24_BE) | \
       (1U << SND_PCM_FORMAT_U24_LE) | \
       (1U << SND_PCM_FORMAT_U24_BE) | \
       (1U << SND_PCM_FORMAT_S32_LE) | \
       (1U << SND_PCM_FORMAT_S32_BE) | \
       (1U << SND_PCM_FORMAT_U32_LE) | \
       (1U << SND_PCM_FORMAT_U32_BE)), \
      ((1U << (SND_PCM_FORMAT_S24_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_U24_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_S24_3BE - 32)) | \
       (1U << (SND_PCM_FORMAT_U24_3BE - 32)) | \
       (1U << (SND_PCM_FORMAT_S20_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_U20_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_S20_3BE - 32)) | \
       (1U << (SND_PCM_FORMAT_U20_3BE - 32)) | \
       (1U << (SND_PCM_FORMAT_S18_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_U18_3LE - 32)) | \
       (1U << (SND_PCM_FORMAT_S18_3BE - 32)) | \
       (1U << (SND_PCM_FORMAT_U18_3BE - 32))) }
      

#define SND_PCM_FMTBIT_FLOAT \
      { ((1U << SND_PCM_FORMAT_FLOAT_LE) | \
       (1U << SND_PCM_FORMAT_FLOAT_BE) | \
       (1U << SND_PCM_FORMAT_FLOAT64_LE) | \
       (1U << SND_PCM_FORMAT_FLOAT64_BE)) }


00827 typedef union snd_tmp_float {
      float f;
      int32_t i;
} snd_tmp_float_t;

00832 typedef union snd_tmp_double {
      double d;
      int64_t l;
} snd_tmp_double_t;

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