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Sourcecode: libsamplerate version File versions

audio_out.c

/*
** Copyright (C) 1999-2003 Erik de Castro Lopo <erikd@mega-nerd.com>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 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 General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; 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 <string.h>
#include <unistd.h>
#include <errno.h>

#include <config.h>

#include "audio_out.h"

#if (HAVE_SNDFILE)

#include <float_cast.h>

#include <sndfile.h>

#define     BUFFER_LEN        (2048)

#define MAKE_MAGIC(a,b,c,d,e,f,g,h)       \
                  ((a) + ((b) << 1) + ((c) << 2) + ((d) << 3) + ((e) << 4) + ((f) << 5) + ((g) << 6) + ((h) << 7))

/*------------------------------------------------------------------------------
**    Linux/OSS functions for playing a sound.
*/

#if defined (__linux__)

#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>

#define     LINUX_MAGIC       MAKE_MAGIC ('L', 'i', 'n', 'u', 'x', 'O', 'S', 'S')

typedef struct
{     int magic ;
      int fd ;
      int channels ;
} LINUX_AUDIO_OUT ;

static AUDIO_OUT *linux_open (int channels, int samplerate) ;
static void linux_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data) ;
static void linux_close (AUDIO_OUT *audio_out) ;


static AUDIO_OUT *
linux_open (int channels, int samplerate)
{     LINUX_AUDIO_OUT   *linux_out ;
      int stereo, temp, error ;

      if ((linux_out = malloc (sizeof (LINUX_AUDIO_OUT))) == NULL)
      {     perror ("linux_open : malloc ") ;
            exit (1) ;
            } ;

      linux_out->magic  = LINUX_MAGIC ;
      linux_out->channels = channels ;

      if ((linux_out->fd = open ("/dev/dsp", O_WRONLY, 0)) == -1)
      {     perror ("linux_open : open ") ;
            exit (1) ;
            } ;

      stereo = 0 ;
      if (ioctl (linux_out->fd, SNDCTL_DSP_STEREO, &stereo) == -1)
      {     /* Fatal error */
            perror ("linux_open : stereo ") ;
            exit (1) ;
            } ;

      if (ioctl (linux_out->fd, SNDCTL_DSP_RESET, 0))
      {     perror ("linux_open : reset ") ;
            exit (1) ;
            } ;

      temp = 16 ;
      if ((error = ioctl (linux_out->fd, SOUND_PCM_WRITE_BITS, &temp)) != 0)
      {     perror ("linux_open : bitwidth ") ;
            exit (1) ;
            } ;

      if ((error = ioctl (linux_out->fd, SOUND_PCM_WRITE_CHANNELS, &channels)) != 0)
      {     perror ("linux_open : channels ") ;
            exit (1) ;
            } ;

      if ((error = ioctl (linux_out->fd, SOUND_PCM_WRITE_RATE, &samplerate)) != 0)
      {     perror ("linux_open : sample rate ") ;
            exit (1) ;
            } ;

      if ((error = ioctl (linux_out->fd, SNDCTL_DSP_SYNC, 0)) != 0)
      {     perror ("linux_open : sync ") ;
            exit (1) ;
            } ;

      return      (AUDIO_OUT*) linux_out ;
} /* linux_open */

static void
linux_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{     LINUX_AUDIO_OUT *linux_out ;
      static float float_buffer [BUFFER_LEN] ;
      static short buffer [BUFFER_LEN] ;
      int         k, readcount ;

      if ((linux_out = (LINUX_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("linux_play : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (linux_out->magic != LINUX_MAGIC)
      {     printf ("linux_play : Bad magic number.\n") ;
            return ;
            } ;

      while ((readcount = callback (callback_data, float_buffer, BUFFER_LEN / linux_out->channels)))
      {     for (k = 0 ; k < readcount * linux_out->channels ; k++)
                  buffer [k] = lrint (32767.0 * float_buffer [k]) ;
            write (linux_out->fd, buffer, readcount * linux_out->channels * sizeof (short)) ;
            } ;

      return ;
} /* linux_play */

static void
linux_close (AUDIO_OUT *audio_out)
{     LINUX_AUDIO_OUT *linux_out ;

      if ((linux_out = (LINUX_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("linux_close : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (linux_out->magic != LINUX_MAGIC)
      {     printf ("linux_close : Bad magic number.\n") ;
            return ;
            } ;

      memset (linux_out, 0, sizeof (LINUX_AUDIO_OUT)) ;

      free (linux_out) ;

      return ;
} /* linux_close */

#endif /* __linux__ */

/*------------------------------------------------------------------------------
**    Mac OS X functions for playing a sound.
*/

#if (defined (__MACH__) && defined (__APPLE__)) /* MacOSX */

#include <Carbon.h>
#include <CoreAudio/AudioHardware.h>

#define     MACOSX_MAGIC      MAKE_MAGIC ('M', 'a', 'c', ' ', 'O', 'S', ' ', 'X')

typedef struct
{     int magic ;
      AudioStreamBasicDescription   format ;

      UInt32                  buf_size ;
      AudioDeviceID     device ;

      int         channels ;
      int   samplerate ;
      int         buffer_size ;
      int         done_playing ;

      get_audio_callback_t    callback ;

      void  *callback_data ;
} MACOSX_AUDIO_OUT ;

static AUDIO_OUT *macosx_open (int channels, int samplerate) ;
static void macosx_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data) ;
static void macosx_close (AUDIO_OUT *audio_out) ;

static OSStatus
macosx_audio_out_callback (AudioDeviceID device, const AudioTimeStamp* current_time,
      const AudioBufferList* data_in, const AudioTimeStamp* time_in,
      AudioBufferList* data_out, const AudioTimeStamp* time_out, void* client_data) ;


static AUDIO_OUT *
macosx_open (int channels, int samplerate)
{     MACOSX_AUDIO_OUT *macosx_out ;
      OSStatus    err ;
      size_t            count ;

      if ((macosx_out = malloc (sizeof (MACOSX_AUDIO_OUT))) == NULL)
      {     perror ("macosx_open : malloc ") ;
            exit (1) ;
            } ;

      macosx_out->magic = MACOSX_MAGIC ;
      macosx_out->channels = channels ;
      macosx_out->samplerate = samplerate ;

      macosx_out->device = kAudioDeviceUnknown ;

      /*  get the default output device for the HAL */
      count = sizeof (AudioDeviceID) ;
      if ((err = AudioHardwareGetProperty (kAudioHardwarePropertyDefaultOutputDevice,
                        &count, (void *) &(macosx_out->device))) != noErr)
      {     printf ("AudioHardwareGetProperty failed.\n") ;
            free (macosx_out) ;
            return NULL ;
            } ;

      /*  get the buffersize that the default device uses for IO */
      count = sizeof (UInt32) ;
      if ((err = AudioDeviceGetProperty (macosx_out->device, 0, false, kAudioDevicePropertyBufferSize,
                        &count, &(macosx_out->buffer_size))) != noErr)
      {     printf ("AudioDeviceGetProperty (AudioDeviceGetProperty) failed.\n") ;
            free (macosx_out) ;
            return NULL ;
            } ;

      /*  get a description of the data format used by the default device */
      count = sizeof (AudioStreamBasicDescription) ;
      if ((err = AudioDeviceGetProperty (macosx_out->device, 0, false, kAudioDevicePropertyStreamFormat,
                        &count, &(macosx_out->format))) != noErr)
      {     printf ("AudioDeviceGetProperty (kAudioDevicePropertyStreamFormat) failed.\n") ;
            free (macosx_out) ;
            return NULL ;
            } ;

      macosx_out->format.mSampleRate = samplerate ;
      macosx_out->format.mChannelsPerFrame = channels ;

      if ((err = AudioDeviceSetProperty (macosx_out->device, NULL, 0, false, kAudioDevicePropertyStreamFormat,
                        sizeof (AudioStreamBasicDescription), &(macosx_out->format))) != noErr)
      {     printf ("AudioDeviceSetProperty (kAudioDevicePropertyStreamFormat) failed.\n") ;
            free (macosx_out) ;
            return NULL ;
            } ;

      /*  we want linear pcm */
      if (macosx_out->format.mFormatID != kAudioFormatLinearPCM)
      {     free (macosx_out) ;
            return NULL ;
            } ;

      macosx_out->done_playing = 0 ;

      /* Fire off the device. */
      if ((err = AudioDeviceAddIOProc (macosx_out->device, macosx_audio_out_callback,
                  (void *) macosx_out)) != noErr)
      {     printf ("AudioDeviceAddIOProc failed.\n") ;
            free (macosx_out) ;
            return NULL ;
            } ;

      return (MACOSX_AUDIO_OUT *) macosx_out ;
} /* macosx_open */

static void
macosx_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{     MACOSX_AUDIO_OUT  *macosx_out ;
      OSStatus    err ;

      if ((macosx_out = (MACOSX_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("macosx_play : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (macosx_out->magic != MACOSX_MAGIC)
      {     printf ("macosx_play : Bad magic number.\n") ;
            return ;
            } ;

      /* Set the callback function and callback data. */
      macosx_out->callback = callback ;
      macosx_out->callback_data = callback_data ;

      err = AudioDeviceStart (macosx_out->device, macosx_audio_out_callback) ;
      if (err != noErr)
            printf ("AudioDeviceStart failed.\n") ;

      while (macosx_out->done_playing == SF_FALSE)
            usleep (10 * 1000) ; /* 10 000 milliseconds. */

      return ;
} /* macosx_play */

static void
macosx_close (AUDIO_OUT *audio_out)
{     MACOSX_AUDIO_OUT  *macosx_out ;
      OSStatus    err ;

      if ((macosx_out = (MACOSX_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("macosx_close : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (macosx_out->magic != MACOSX_MAGIC)
      {     printf ("macosx_close : Bad magic number.\n") ;
            return ;
            } ;


      if ((err = AudioDeviceStop (macosx_out->device, macosx_audio_out_callback)) != noErr)
      {     printf ("AudioDeviceStop failed.\n") ;
            return ;
            } ;

      err = AudioDeviceRemoveIOProc (macosx_out->device, macosx_audio_out_callback) ;
      if (err != noErr)
      {     printf ("AudioDeviceRemoveIOProc failed.\n") ;
            return ;
            } ;

} /* macosx_close */

static OSStatus
macosx_audio_out_callback (AudioDeviceID device, const AudioTimeStamp* current_time,
      const AudioBufferList* data_in, const AudioTimeStamp* time_in,
      AudioBufferList* data_out, const AudioTimeStamp* time_out, void* client_data)
{     MACOSX_AUDIO_OUT  *macosx_out ;
      int         k, size, sample_count, read_count ;
      float *buffer ;

      if ((macosx_out = (MACOSX_AUDIO_OUT*) client_data) == NULL)
      {     printf ("macosx_play : AUDIO_OUT is NULL.\n") ;
            return 42 ;
            } ;

      if (macosx_out->magic != MACOSX_MAGIC)
      {     printf ("macosx_play : Bad magic number.\n") ;
            return 42 ;
            } ;

      size = data_out->mBuffers [0].mDataByteSize ;
      sample_count = size / sizeof (float) / macosx_out->channels ;

      buffer = (float*) data_out->mBuffers [0].mData ;

      read_count = macosx_out->callback (macosx_out->callback_data, buffer, sample_count) ;

      if (read_count < sample_count)
      {     memset (&(buffer [read_count]), 0, (sample_count - read_count) * sizeof (float)) ;
            macosx_out->done_playing = 1 ;
            } ;

      return noErr ;
} /* macosx_audio_out_callback */

#endif /* MacOSX */


/*------------------------------------------------------------------------------
**    Win32 functions for playing a sound.
**
**    This API sucks. Its needlessly complicated and is *WAY* too loose with
**    passing pointers arounf in integers and and using char* pointers to
**  point to data instead of short*. It plain sucks!
*/

#if (defined (_WIN32) || defined (WIN32))

#include <windows.h>
#include <mmsystem.h>
#include <mmreg.h>

#define     WIN32_BUFFER_LEN  (1<<15)
#define     WIN32_MAGIC             MAKE_MAGIC ('W', 'i', 'n', '3', '2', 's', 'u', 'x')

typedef struct
{     int               magic ;

      HWAVEOUT          hwave ;
      WAVEHDR                 whdr [2] ;

      HANDLE                  Event ;

      short             short_buffer [WIN32_BUFFER_LEN / sizeof (short)] ;
      float             float_buffer [WIN32_BUFFER_LEN / sizeof (short) / 2] ;

      int                     bufferlen, current ;

      int                     channels ;

      get_audio_callback_t    callback ;

      void              *callback_data ;
} WIN32_AUDIO_OUT ;

static AUDIO_OUT *win32_open (int channels, int samplerate) ;
static void win32_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data) ;
static void win32_close (AUDIO_OUT *audio_out) ;

static DWORD CALLBACK
      win32_audio_out_callback (HWAVEOUT hwave, UINT msg, DWORD data, DWORD param1, DWORD param2) ;

static AUDIO_OUT*
win32_open (int channels, int samplerate)
{     WIN32_AUDIO_OUT *win32_out ;

      WAVEFORMATEX wf ;
      int error ;

      if ((win32_out = malloc (sizeof (WIN32_AUDIO_OUT))) == NULL)
      {     perror ("win32_open : malloc ") ;
            exit (1) ;
            } ;

      win32_out->magic  = WIN32_MAGIC ;
      win32_out->channels = channels ;

      win32_out->current = 0 ;

      win32_out->Event = CreateEvent (0, FALSE, FALSE, 0) ;

      wf.nChannels = channels ;
      wf.nSamplesPerSec = samplerate ;
      wf.nBlockAlign = channels * sizeof (short) ;

      wf.wFormatTag = WAVE_FORMAT_PCM ;
      wf.cbSize = 0 ;
      wf.wBitsPerSample = 16 ;
      wf.nAvgBytesPerSec = wf.nBlockAlign * wf.nSamplesPerSec ;

      error = waveOutOpen (&(win32_out->hwave), WAVE_MAPPER, &wf, (DWORD) win32_audio_out_callback,
                                          (DWORD) win32_out, CALLBACK_FUNCTION) ;
      if (error)
      {     puts ("waveOutOpen failed.") ;
            free (win32_out) ;
            return NULL ;
            } ;

      waveOutPause (win32_out->hwave) ;

      return (WIN32_AUDIO_OUT *) win32_out ;
} /* win32_open */

static void
win32_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{     WIN32_AUDIO_OUT   *win32_out ;
      int         error ;

      if ((win32_out = (WIN32_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("win32_play : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (win32_out->magic != WIN32_MAGIC)
      {     printf ("win32_play : Bad magic number (%d %d).\n", win32_out->magic, WIN32_MAGIC) ;
            return ;
            } ;

      /* Set the callback function and callback data. */
      win32_out->callback = callback ;
      win32_out->callback_data = callback_data ;

      win32_out->whdr [0].lpData = (char*) win32_out->short_buffer ;
      win32_out->whdr [1].lpData = ((char*) win32_out->short_buffer) + sizeof (win32_out->short_buffer) / 2 ;

      win32_out->whdr [0].dwBufferLength = sizeof (win32_out->short_buffer) / 2 ;
      win32_out->whdr [1].dwBufferLength = sizeof (win32_out->short_buffer) / 2 ;

      win32_out->bufferlen = sizeof (win32_out->short_buffer) / 2 / sizeof (short) ;

      /* Prepare the WAVEHDRs */
      if ((error = waveOutPrepareHeader (win32_out->hwave, &(win32_out->whdr [0]), sizeof (WAVEHDR))))
      {     printf ("waveOutPrepareHeader [0] failed : %08X\n", error) ;
            waveOutClose (win32_out->hwave) ;
            return ;
            } ;

      if ((error = waveOutPrepareHeader (win32_out->hwave, &(win32_out->whdr [1]), sizeof (WAVEHDR))))
      {     printf ("waveOutPrepareHeader [1] failed : %08X\n", error) ;
            waveOutUnprepareHeader (win32_out->hwave, &(win32_out->whdr [0]), sizeof (WAVEHDR)) ;
            waveOutClose (win32_out->hwave) ;
            return ;
            } ;

      waveOutRestart (win32_out->hwave) ;

      /* Fake 2 calls to the callback function to queue up enough audio. */
      win32_audio_out_callback (0, MM_WOM_DONE, (DWORD) win32_out, 0, 0) ;
      win32_audio_out_callback (0, MM_WOM_DONE, (DWORD) win32_out, 0, 0) ;

      /* Wait for playback to finish. The callback notifies us when all
      ** wave data has been played.
      */
      WaitForSingleObject (win32_out->Event, INFINITE) ;

      waveOutPause (win32_out->hwave) ;
      waveOutReset (win32_out->hwave) ;

      waveOutUnprepareHeader (win32_out->hwave, &(win32_out->whdr [0]), sizeof (WAVEHDR)) ;
      waveOutUnprepareHeader (win32_out->hwave, &(win32_out->whdr [1]), sizeof (WAVEHDR)) ;

      waveOutClose (win32_out->hwave) ;
      win32_out->hwave = 0 ;

      return ;
} /* win32_play */

static void
win32_close (AUDIO_OUT *audio_out)
{     WIN32_AUDIO_OUT *win32_out ;

      if ((win32_out = (WIN32_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("win32_close : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (win32_out->magic != WIN32_MAGIC)
      {     printf ("win32_close : Bad magic number.\n") ;
            return ;
            } ;

      memset (win32_out, 0, sizeof (WIN32_AUDIO_OUT)) ;

      free (win32_out) ;
} /* win32_close */

static DWORD CALLBACK
win32_audio_out_callback (HWAVEOUT hwave, UINT msg, DWORD data, DWORD param1, DWORD param2)
{     WIN32_AUDIO_OUT   *win32_out ;
      int         read_count, sample_count, k ;
      short *sptr ;

      /*
      ** I consider this technique of passing a pointer via an integer as
      ** fundamentally broken but thats the way microsoft has defined the
      ** interface.
      */
      if ((win32_out = (WIN32_AUDIO_OUT*) data) == NULL)
      {     printf ("win32_audio_out_callback : AUDIO_OUT is NULL.\n") ;
            return 1 ;
            } ;

      if (win32_out->magic != WIN32_MAGIC)
      {     printf ("win32_audio_out_callback : Bad magic number (%d %d).\n", win32_out->magic, WIN32_MAGIC) ;
            return 1 ;
            } ;

      if (msg != MM_WOM_DONE)
            return 0 ;

      /* Do the actual audio. */
      sample_count = win32_out->bufferlen ;

      read_count = win32_out->callback (win32_out->callback_data, win32_out->float_buffer, sample_count) ;

      sptr = (short*) win32_out->whdr [win32_out->current].lpData ;

      for (k = 0 ; k < read_count ; k++)
            sptr [k] = lrint (32767.0 * win32_out->float_buffer [k]) ;

      if (read_count > 0)
      {     /* Fix buffer length is only a partial block. */
            if (read_count * sizeof (short) < win32_out->bufferlen)
                  win32_out->whdr [win32_out->current].dwBufferLength = read_count * sizeof (short) ;

            /* Queue the WAVEHDR */
            waveOutWrite (win32_out->hwave, (LPWAVEHDR) &(win32_out->whdr [win32_out->current]), sizeof (WAVEHDR)) ;
            }
      else
      {     /* Stop playback */
            waveOutPause (win32_out->hwave) ;

            SetEvent (win32_out->Event) ;
            } ;

      win32_out->current = (win32_out->current + 1) % 2 ;

      return 0 ;
} /* win32_audio_out_callback */

#endif /* Win32 */

/*------------------------------------------------------------------------------
**    Solaris.
*/

#if (defined (sun) && defined (unix)) /* ie Solaris */

#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>

#define     SOLARIS_MAGIC     MAKE_MAGIC ('S', 'o', 'l', 'a', 'r', 'i', 's', ' ')

typedef struct
{     int magic ;
      int fd ;
      int channels ;
      int samplerate ;
} SOLARIS_AUDIO_OUT ;

static AUDIO_OUT *solaris_open (int channels, int samplerate) ;
static void solaris_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data) ;
static void solaris_close (AUDIO_OUT *audio_out) ;

static AUDIO_OUT *
solaris_open (int channels, int samplerate)
{     SOLARIS_AUDIO_OUT *solaris_out ;
      audio_info_t            audio_info ;
      int                           error ;

      if ((solaris_out = malloc (sizeof (SOLARIS_AUDIO_OUT))) == NULL)
      {     perror ("solaris_open : malloc ") ;
            exit (1) ;
            } ;

      solaris_out->magic            = SOLARIS_MAGIC ;
      solaris_out->channels   = channels ;
      solaris_out->samplerate = channels ;

      /* open the audio device - write only, non-blocking */
      if ((solaris_out->fd = open ("/dev/audio", O_WRONLY | O_NONBLOCK)) < 0)
      {     perror ("open (/dev/audio) failed") ;
            exit (1) ;
            } ;

      /*    Retrive standard values. */
      AUDIO_INITINFO (&audio_info) ;

      audio_info.play.sample_rate = samplerate ;
      audio_info.play.channels = channels ;
      audio_info.play.precision = 16 ;
      audio_info.play.encoding = AUDIO_ENCODING_LINEAR ;
      audio_info.play.gain = AUDIO_MAX_GAIN ;
      audio_info.play.balance = AUDIO_MID_BALANCE ;

      if ((error = ioctl (solaris_out->fd, AUDIO_SETINFO, &audio_info)))
      {     perror ("ioctl (AUDIO_SETINFO) failed") ;
            exit (1) ;
            } ;

      return      (AUDIO_OUT*) solaris_out ;
} /* solaris_open */

static void
solaris_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{     SOLARIS_AUDIO_OUT *solaris_out ;
      static float float_buffer [BUFFER_LEN] ;
      static short buffer [BUFFER_LEN] ;
      int         k, readcount ;

      if ((solaris_out = (SOLARIS_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("solaris_play : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (solaris_out->magic != SOLARIS_MAGIC)
      {     printf ("solaris_play : Bad magic number.\n") ;
            return ;
            } ;

      while ((readcount = callback (callback_data, float_buffer, BUFFER_LEN / solaris_out->channels)))
      {     for (k = 0 ; k < readcount * solaris_out->channels ; k++)
                  buffer [k] = lrint (32767.0 * float_buffer [k]) ;
            write (solaris_out->fd, buffer, readcount * solaris_out->channels * sizeof (short)) ;
            } ;

      return ;
} /* solaris_play */

static void
solaris_close (AUDIO_OUT *audio_out)
{     SOLARIS_AUDIO_OUT *solaris_out ;

      if ((solaris_out = (SOLARIS_AUDIO_OUT*) audio_out) == NULL)
      {     printf ("solaris_close : AUDIO_OUT is NULL.\n") ;
            return ;
            } ;

      if (solaris_out->magic != SOLARIS_MAGIC)
      {     printf ("solaris_close : Bad magic number.\n") ;
            return ;
            } ;

      memset (solaris_out, 0, sizeof (SOLARIS_AUDIO_OUT)) ;

      free (solaris_out) ;

      return ;
} /* solaris_close */

#endif /* Solaris */

/*==============================================================================
**    Main function.
*/

AUDIO_OUT *
audio_open (int channels, int samplerate)
{
#if defined (__linux__)
      return linux_open (channels, samplerate) ;
#elif (defined (__MACH__) && defined (__APPLE__))
      return macosx_open (channels, samplerate) ;
#elif (defined (sun) && defined (unix))
      return solaris_open (channels, samplerate) ;
#elif (defined (_WIN32) || defined (WIN32))
      return win32_open (channels, samplerate) ;
#else
      #warning "*** Playing sound not yet supported on this platform."
      #warning "*** Please feel free to submit a patch."
      printf ("Error : Playing sound not yet supported on this platform.\n") ;
      return NULL ;
#endif


      return NULL ;
} /* audio_open */

void
audio_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{

      if (callback == NULL)
      {     printf ("Error : bad callback pointer.\n") ;
            return ;
            } ;

      if (audio_out == NULL)
      {     printf ("Error : bad audio_out pointer.\n") ;
            return ;
            } ;

      if (callback_data == NULL)
      {     printf ("Error : bad callback_data pointer.\n") ;
            return ;
            } ;

#if defined (__linux__)
      linux_play (callback, audio_out, callback_data) ;
#elif (defined (__MACH__) && defined (__APPLE__))
      macosx_play (callback, audio_out, callback_data) ;
#elif (defined (sun) && defined (unix))
      solaris_play (callback, audio_out, callback_data) ;
#elif (defined (_WIN32) || defined (WIN32))
      win32_play (callback, audio_out, callback_data) ;
#else
      #warning "*** Playing sound not yet supported on this platform."
      #warning "*** Please feel free to submit a patch."
      printf ("Error : Playing sound not yet supported on this platform.\n") ;
      return ;
#endif

      return ;
} /* audio_play */

void
audio_close (AUDIO_OUT *audio_out)
{
#if defined (__linux__)
      linux_close (audio_out) ;
#elif (defined (__MACH__) && defined (__APPLE__))
      macosx_close (audio_out) ;
#elif (defined (sun) && defined (unix))
      solaris_close (audio_out) ;
#elif (defined (_WIN32) || defined (WIN32))
      win32_close (audio_out) ;
#else
      #warning "*** Playing sound not yet supported on this platform."
      #warning "*** Please feel free to submit a patch."
      printf ("Error : Playing sound not yet supported on this platform.\n") ;
      return ;
#endif

      return ;
} /* audio_close */

#else /* (HAVE_SNDFILE == 0) */

/* Do not have libsndfile installed so just return. */

AUDIO_OUT *
audio_open (int channels, int samplerate)
{
      channels = samplerate ;

      return NULL ;
} /* audio_open */

void
audio_play (get_audio_callback_t callback, AUDIO_OUT *audio_out, void *callback_data)
{
      callback = NULL ;
      audio_out = NULL ;
      callback_data = NULL ;

      return ;
} /* audio_play */

void
audio_close (AUDIO_OUT *audio_out)
{
      audio_out = audio_out ;

      return ;
} /* audio_close */

#endif /* HAVE_SNDFILE */

/*
** Do not edit or modify anything in this comment block.
** The arch-tag line is a file identity tag for the GNU Arch 
** revision control system.
**
** arch-tag: 46fb3b80-7460-44ec-99b3-c893fa320b86
*/


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