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#include <sys/types.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include "mpg123.h"
#include <windows.h>
static CRITICAL_SECTION cs;
static HWAVEOUT dev = NULL;
static int nBlocks = 0;
static int MAX_BLOCKS = 6;
static _inline void wait(void)
{
while(nBlocks)
Sleep(77);
}
static void CALLBACK wave_callback(HWAVE hWave, UINT uMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2)
{
WAVEHDR *wh;
HGLOBAL hg;
if(uMsg == WOM_DONE)
{
EnterCriticalSection( &cs );
wh = (WAVEHDR *)dwParam1;
waveOutUnprepareHeader(dev, wh, sizeof (WAVEHDR));
//Deallocate the buffer memory
hg = GlobalHandle(wh->lpData);
GlobalUnlock(hg);
GlobalFree(hg);
//Deallocate the header memory
hg = GlobalHandle(wh);
GlobalUnlock(hg);
GlobalFree(hg);
// decrease the number of USED blocks
nBlocks--;
LeaveCriticalSection( &cs );
}
}
int audio_open(struct audio_info_struct *ai)
{
MMRESULT res;
WAVEFORMATEX outFormatex;
if(ai->rate == -1)
return(0);
if(!waveOutGetNumDevs())
{
MessageBox(NULL, "No audio devices present!", "Error...", MB_OK);
return -1;
}
outFormatex.wFormatTag = WAVE_FORMAT_PCM;
outFormatex.wBitsPerSample = 16;
outFormatex.nChannels = 2;
outFormatex.nSamplesPerSec = ai->rate;
outFormatex.nAvgBytesPerSec = outFormatex.nSamplesPerSec * outFormatex.nChannels * outFormatex.wBitsPerSample/8;
outFormatex.nBlockAlign = outFormatex.nChannels * outFormatex.wBitsPerSample/8;
res = waveOutOpen(&dev, (UINT)ai->device, &outFormatex, (DWORD)wave_callback, 0, CALLBACK_FUNCTION);
if(res != MMSYSERR_NOERROR)
{
switch(res)
{
case MMSYSERR_ALLOCATED:
MessageBox(NULL, "Device Is Already Open", "Error...", MB_OK);
break;
case MMSYSERR_BADDEVICEID:
MessageBox(NULL, "The Specified Device Is out of range", "Error...", MB_OK);
break;
case MMSYSERR_NODRIVER:
MessageBox(NULL, "There is no audio driver in this system.", "Error...", MB_OK);
break;
case MMSYSERR_NOMEM:
MessageBox(NULL, "Unable to allocate sound memory.", "Error...", MB_OK);
break;
case WAVERR_BADFORMAT:
MessageBox(NULL, "This audio format is not supported.", "Error...", MB_OK);
break;
case WAVERR_SYNC:
MessageBox(NULL, "The device is synchronous.", "Error...", MB_OK);
break;
default:
MessageBox(NULL, "Unknown Media Error", "Error...", MB_OK);
break;
}
return -1;
}
waveOutReset(dev);
InitializeCriticalSection(&cs);
return 0;
}
int audio_reset_parameters(struct audio_info_struct *ai)
{
return 0;
}
int audio_rate_best_match(struct audio_info_struct *ai)
{
return 0;
}
int audio_set_rate(struct audio_info_struct *ai)
{
return 0;
}
int audio_set_channels(struct audio_info_struct *ai)
{
return 0;
}
int audio_set_format(struct audio_info_struct *ai)
{
return 0;
}
int audio_get_formats(struct audio_info_struct *ai)
{
return AUDIO_FORMAT_SIGNED_16;
}
int audio_play_samples(struct audio_info_struct *ai,unsigned char *buf,int len)
{
HGLOBAL hg, hg2;
LPWAVEHDR wh;
MMRESULT res;
void *b;
///////////////////////////////////////////////////////
// Wait for a few FREE blocks...
///////////////////////////////////////////////////////
while(nBlocks > MAX_BLOCKS)
Sleep(77);
////////////////////////////////////////////////////////
// FIRST allocate some memory for a copy of the buffer!
////////////////////////////////////////////////////////
hg2 = GlobalAlloc(GMEM_MOVEABLE, len);
if(!hg2)
{
MessageBox(NULL, "GlobalAlloc failed!", "Error...", MB_OK);
return(-1);
}
b = GlobalLock(hg2);
//////////////////////////////////////////////////////////
// Here we can call any modification output functions we want....
///////////////////////////////////////////////////////////
CopyMemory(b, buf, len);
///////////////////////////////////////////////////////////
// now make a header and WRITE IT!
///////////////////////////////////////////////////////////
hg = GlobalAlloc (GMEM_MOVEABLE | GMEM_ZEROINIT, sizeof (WAVEHDR));
if(!hg)
{
return -1;
}
wh = GlobalLock(hg);
wh->dwBufferLength = len;
wh->lpData = b;
EnterCriticalSection( &cs );
res = waveOutPrepareHeader(dev, wh, sizeof (WAVEHDR));
if(res)
{
GlobalUnlock(hg);
GlobalFree(hg);
LeaveCriticalSection( &cs );
return -1;
}
res = waveOutWrite(dev, wh, sizeof (WAVEHDR));
if(res)
{
GlobalUnlock(hg);
GlobalFree(hg);
LeaveCriticalSection( &cs );
return (-1);
}
nBlocks++;
LeaveCriticalSection( &cs );
return(len);
}
int audio_close(struct audio_info_struct *ai)
{
if(dev)
{
wait();
waveOutReset(dev); //reset the device
waveOutClose(dev); //close the device
dev=NULL;
}
DeleteCriticalSection(&cs);
nBlocks = 0;
return(0);
}
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