ref: c83e66fdcd3e78602b7b56dd037ef6d7ba7ee5a3
dir: /src/wave_out.c/
/* Copyright (c) 2002, John Edwards
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
- Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
- Neither the name of the Xiph.org Foundation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* Set TABS = 4 */
/********************************************************************
function: To provide playback of 16 bit PCM wave data in Win32
environments from decoded compressed files.
********************************************************************/
#if defined WIN32 || defined _WIN32
#include <string.h>
#include <errno.h>
#include "wave_out.h"
#define MAXWAVESIZE 4294967040LU
#define MAX_WAVEBLOCKS 32
// This is modified for USE_WIN_AUDIO - ONLY 2002-02-27
static CRITICAL_SECTION cs;
static HWAVEOUT dev = NULL;
static int ScheduledBlocks = 0;
static int PlayedWaveHeadersCount = 0; // free index
static WAVEHDR* PlayedWaveHeaders [MAX_WAVEBLOCKS];
static int
Box ( const char* msg )
{
MessageBox ( NULL, msg, " "VERSION_STRING": Error Message . . .", MB_OK | MB_ICONEXCLAMATION );
return -1;
}
/*
* This function registers already played WAVE chunks. Freeing is done by free_memory(),
*/
static void CALLBACK
wave_callback ( HWAVE hWave, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2 )
{
if ( uMsg == WOM_DONE ) {
EnterCriticalSection ( &cs );
PlayedWaveHeaders [PlayedWaveHeadersCount++] = (WAVEHDR*) dwParam1;
LeaveCriticalSection ( &cs );
}
}
static void
free_memory ( void )
{
WAVEHDR* wh;
HGLOBAL hg;
EnterCriticalSection ( &cs );
wh = PlayedWaveHeaders [--PlayedWaveHeadersCount];
ScheduledBlocks--; // decrease the number of USED blocks
LeaveCriticalSection ( &cs );
waveOutUnprepareHeader ( dev, wh, sizeof (WAVEHDR) );
hg = GlobalHandle ( wh -> lpData ); // Deallocate the buffer memory
GlobalUnlock (hg);
GlobalFree (hg);
hg = GlobalHandle ( wh ); // Deallocate the header memory
GlobalUnlock (hg);
GlobalFree (hg);
}
Int
Set_WIN_Params ( FILE_T dummyFile ,
Ldouble SampleFreq,
Uint BitsPerSample,
Uint Channels )
{
WAVEFORMATEX outFormat;
UINT deviceID = WAVE_MAPPER;
(void) dummyFile;
if ( waveOutGetNumDevs () == 0 )
return Box ( "No audio device present." );
outFormat.wFormatTag = WAVE_FORMAT_PCM;
outFormat.wBitsPerSample = BitsPerSample;
outFormat.nChannels = Channels;
outFormat.nSamplesPerSec = (unsigned long)(SampleFreq + 0.5);
outFormat.nBlockAlign = (outFormat.wBitsPerSample + 7) / 8 * outFormat.nChannels;
outFormat.nAvgBytesPerSec = outFormat.nSamplesPerSec * outFormat.nBlockAlign;
switch ( waveOutOpen ( &dev, deviceID, &outFormat, (DWORD)wave_callback, 0, CALLBACK_FUNCTION ) )
{
case MMSYSERR_ALLOCATED: return Box ( "Device is already open." );
case MMSYSERR_BADDEVICEID: return Box ( "The specified device is out of range." );
case MMSYSERR_NODRIVER: return Box ( "There is no audio driver in this system." );
case MMSYSERR_NOMEM: return Box ( "Unable to allocate sound memory." );
case WAVERR_BADFORMAT: return Box ( "This audio format is not supported." );
case WAVERR_SYNC: return Box ( "The device is synchronous." );
default: return Box ( "Unknown media error." );
case MMSYSERR_NOERROR: break;
}
waveOutReset ( dev );
InitializeCriticalSection ( &cs );
SetPriorityClass ( GetCurrentProcess (), HIGH_PRIORITY_CLASS );
return 0;
}
int
WIN_Play_Samples ( const void* data, size_t len )
{
HGLOBAL hg;
HGLOBAL hg2;
LPWAVEHDR wh;
void* allocptr;
do {
while ( PlayedWaveHeadersCount > 0 ) // free used blocks ...
free_memory ();
if ( ScheduledBlocks < sizeof(PlayedWaveHeaders)/sizeof(*PlayedWaveHeaders) ) // wait for a free block ...
break;
Sleep (26);
} while (1);
if ( (hg2 = GlobalAlloc ( GMEM_MOVEABLE, len )) == NULL ) // allocate some memory for a copy of the buffer
return Box ( "GlobalAlloc failed." );
allocptr = GlobalLock (hg2);
CopyMemory ( allocptr, data, len ); // Here we can call any modification output functions we want....
if ( (hg = GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, sizeof (WAVEHDR))) == NULL ) // now make a header and WRITE IT!
return -1;
wh = GlobalLock (hg);
wh -> dwBufferLength = len;
wh -> lpData = allocptr;
if ( waveOutPrepareHeader ( dev, wh, sizeof (WAVEHDR)) != MMSYSERR_NOERROR ) {
GlobalUnlock (hg);
GlobalFree (hg);
return -1;
}
if ( waveOutWrite ( dev, wh, sizeof (WAVEHDR)) != MMSYSERR_NOERROR ) {
GlobalUnlock (hg);
GlobalFree (hg);
return -1;
}
EnterCriticalSection ( &cs );
ScheduledBlocks++;
LeaveCriticalSection ( &cs );
return len;
}
int
WIN_Audio_close ( void )
{
if ( dev != NULL ) {
while ( ScheduledBlocks > 0 ) {
Sleep (ScheduledBlocks);
while ( PlayedWaveHeadersCount > 0 ) // free used blocks ...
free_memory ();
}
waveOutReset (dev); // reset the device
waveOutClose (dev); // close the device
dev = NULL;
}
DeleteCriticalSection ( &cs );
ScheduledBlocks = 0;
return 0;
}
#endif
/* end of wave_out.c */