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Light ROM 1
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LIGHT-ROM 1 (Amiga Library Services)(1994).iso
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d910.lha
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DSound
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PlayStereo.c
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C/C++ Source or Header
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1993-08-28
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6KB
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215 lines
/*************************************************************************/
/* PlayStereo.c */
/* Contains code used to play stereo samples */
/*************************************************************************/
#include <exec/types.h>
#include <exec/exec.h>
#include <devices/audio.h>
#include <dos/dos.h>
#include <intuition/intuition.h>
#include <intuition/intuitionbase.h>
#include <graphics/gfxbase.h>
#include <stdlib.h>
#include "dsound.h"
#include <proto/intuition.h>
#include <proto/exec.h>
#include <proto/dos.h>
extern UBYTE rightAMap[];
extern UBYTE leftAMap[];
extern UBYTE eitherAMap[];
extern UBYTE bothAMap[];
extern UBYTE volume;
extern UWORD speed;
extern ULONG bufSize;
extern BOOL readAll;
extern BOOL loop;
extern struct Window *window;
extern ULONG signalMask;
/*Play a stereo sample out of both speakers*/
/*If the user specifies that just one of the two stereo channels will*/
/*be played, DSound.c calls playMonoSample*/
void playStereoSample(BPTR leftFile,channel audioChannel,
struct Voice8Header *vhdr, ULONG length, char *filename)
{
struct IOAudio *iob1_right,*iob2_right,*iob1_left,*iob2_left;
struct IOAudio *cur_right,*cur_left,*alt_right,*alt_left;
ULONG toRead;
ULONG amountLeft;
ULONG sampleSize=length;
BOOL done=FALSE;
BPTR rightFile;
/*Open the file again*/
rightFile=dupFileHandle(leftFile,filename);
/*And position ourselves at the start of the right channel's data*/
Seek(rightFile,length,OFFSET_CURRENT);
/*Read the entire sample into memory, if specified*/
if(readAll)
{
storeLeft(leftFile,length,bufSize);
storeRight(rightFile,length,bufSize);
Close(rightFile);
leftFile=0L;
rightFile=4L;
}
/*Get the first audio channel*/
iob1_left=GetAudioChannel(bufSize,leftAMap);
if(iob1_left==NULL)
{
WriteMsg("Couldn't create the first stereo buffer\n");
cleanup(150);
}
iob1_right=GetAudioChannel(bufSize,rightAMap);
if(iob1_right==NULL)
{
WriteMsg("Couldn't create the second stereo buffer\n");
cleanup(150);
}
/* If the user didn't specify a volume, get it from the VHDR */
if(volume==0)
volume=(vhdr->volume>>10);
/* If the VHDR gave a volume of zero, use maximum volume*/
if(volume==0)
volume=64;
/* Get the samples/sec rate (either the rate given by the user, or the*/
/* rate found in the VHDR) */
if(speed==0)
speed=1000000000/(vhdr->samplesPerSec*279);
else
speed=1000000000/(speed*279);
InitAudioChannel(iob1_left,volume,speed);
InitAudioChannel(iob1_right,volume,speed);
/*Get the 2nd audio channel*/
iob2_left=DuplicateAudioChannel(iob1_left);
if(iob2_left==NULL)
{
FreeAudioChannel(iob1_left);
FreeAudioChannel(iob1_right);
WriteMsg("Couldn't create the second buffer");
cleanup(175);
}
iob2_right=DuplicateAudioChannel(iob1_right);
if(iob2_right==NULL)
{
FreeAudioChannel(iob1_left);
DeleteDuplication(iob2_left);
FreeAudioChannel(iob1_right);
WriteMsg("Couldn't create the second buffer");
cleanup(175);
}
/* Load the first buffer*/
toRead=MIN(length,bufSize);
LoadAudioBuffer(leftFile,iob1_left,toRead);
LoadAudioBuffer(rightFile,iob1_right,toRead);
iob1_left->ioa_Length=iob1_right->ioa_Length=toRead;
length-=toRead;
if(length==0 && loop)
{
length=sampleSize;
if(!readAll)
{
Seek(leftFile,-sampleSize,OFFSET_CURRENT);
Seek(rightFile,-sampleSize,OFFSET_CURRENT);
}
}
/*Initialize the sample position info*/
updateSampleInfo(0,sampleSize,vhdr->samplesPerSec);
/*And queue up the play requests*/
BeginIO((struct IORequest *)iob1_left);
BeginIO((struct IORequest *)iob1_right);
cur_right=iob2_right;
cur_left=iob2_left;
alt_right=iob1_right;
alt_left=iob1_left;
/*Loop while there's stuff to read*/
while(!done)
{
toRead=MIN(length,bufSize);
if(toRead!=0)
{
LoadAudioBuffer(leftFile,cur_left,toRead);
LoadAudioBuffer(rightFile,cur_right,toRead);
cur_left->ioa_Length=cur_right->ioa_Length=toRead;
BeginIO((struct IORequest *)cur_left);
BeginIO((struct IORequest *)cur_right);
amountLeft=length-=toRead;
if(length==0 && loop)
{
length=sampleSize;
if(!readAll)
{
Seek(leftFile,-sampleSize,OFFSET_CURRENT);
Seek(rightFile,-sampleSize,OFFSET_CURRENT);
}
}
done=FALSE;
}
else
done=TRUE;
/*Wait for the buffer to finish*/
if((Wait(1<<cur_right->ioa_Request.io_Message.mn_ReplyPort->mp_SigBit |
signalMask) & SIGBREAKF_CTRL_C) == SIGBREAKF_CTRL_C)
done=TRUE;
/*Update the sample position info*/
updateSampleInfo(sampleSize-amountLeft-toRead,sampleSize,vhdr->samplesPerSec);
/*If we got a message from the window, it is a CLOSEWINDOW message*/
/*and we're done*/
if(window!=NULL && GetMsg(window->UserPort)!=NULL)
{
done=TRUE;
}
swapPointers(&cur_left,&alt_left);
swapPointers(&cur_right,&alt_right);
}
/*Restore the buffer lengths, so that FreeAudio() channel, etc., knows*/
/*how much memory to free*/
iob1_left->ioa_Length=iob2_left->ioa_Length=bufSize;
iob1_right->ioa_Length=iob2_right->ioa_Length=bufSize;
FreeAudioChannel(iob1_left);
DeleteDuplication(iob2_left);
FreeAudioChannel(iob1_right);
DeleteDuplication(iob2_right);
if(rightFile != 4L)
Close(rightFile);
return;
}
/*End of PlayStereo.c*/