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mirror of https://github.com/w23/xash3d-fwgs synced 2024-12-24 02:15:39 +01:00
xash3d-fwgs/engine/client/s_utils.c
Gleb Mazovetskiy 5e0a0765ce Trim all trailing whitespace
The `.editorconfig` file in this repo is configured to trim all trailing
whitespace regardless of whether the line is modified.

Trims all trailing whitespace in the repository to make the codebase easier
to work with in editors that respect `.editorconfig`.

`git blame` becomes less useful on these lines but it already isn't very useful.

Commands:

```
find . -type f -name '*.h' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
find . -type f -name '*.c' -exec sed --in-place 's/[[:space:]]\+$//' {} \+
```
2021-01-04 20:55:10 +03:00

307 lines
7.0 KiB
C

/*
s_utils.c - common sound functions
Copyright (C) 2009 Uncle Mike
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 3 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.
*/
#include "common.h"
#include "sound.h"
// hardcoded macros to test for zero crossing
#define ZERO_X_8( b ) (( b ) < 2 && ( b ) > -2 )
#define ZERO_X_16( b ) (( b ) < 512 && ( b ) > -512 )
//-----------------------------------------------------------------------------
// Purpose: Search backward for a zero crossing starting at sample
// Input : sample - starting point
// Output : position of zero crossing
//-----------------------------------------------------------------------------
int S_ZeroCrossingBefore( wavdata_t *pWaveData, int sample )
{
if( pWaveData == NULL )
return sample;
if( pWaveData->type == WF_PCMDATA )
{
int sampleSize;
sampleSize = pWaveData->width * pWaveData->channels;
// this can never be zero -- other functions divide by this.
// This should never happen, but avoid crashing
if( sampleSize <= 0 ) sampleSize = 1;
if( pWaveData->width == 1 )
{
signed char *pData = (signed char *)(pWaveData->buffer + sample * sampleSize);
qboolean zero = false;
if( pWaveData->channels == 1 )
{
while( sample > 0 && !zero )
{
if( ZERO_X_8( *pData ))
{
zero = true;
}
else
{
sample--;
pData--;
}
}
}
else
{
while( sample > 0 && !zero )
{
if( ZERO_X_8( *pData ) && ZERO_X_8( pData[1] ))
{
zero = true;
}
else
{
sample--;
pData--;
}
}
}
}
else
{
short *pData = (short *)(pWaveData->buffer + sample * sampleSize);
qboolean zero = false;
if( pWaveData->channels == 1 )
{
while( sample > 0 && !zero )
{
if( ZERO_X_16(*pData ))
{
zero = true;
}
else
{
pData--;
sample--;
}
}
}
else
{
while( sample > 0 && !zero )
{
if( ZERO_X_16( *pData ) && ZERO_X_16( pData[1] ))
{
zero = true;
}
else
{
sample--;
pData--;
}
}
}
}
}
return sample;
}
//-----------------------------------------------------------------------------
// Purpose: Search forward for a zero crossing
// Input : sample - starting point
// Output : position of found zero crossing
//-----------------------------------------------------------------------------
int S_ZeroCrossingAfter( wavdata_t *pWaveData, int sample )
{
if( pWaveData == NULL )
return sample;
if( pWaveData->type == WF_PCMDATA )
{
int sampleSize;
sampleSize = pWaveData->width * pWaveData->channels;
// this can never be zero -- other functions divide by this.
// This should never happen, but avoid crashing
if( sampleSize <= 0 ) sampleSize = 1;
if( pWaveData->width == 1 ) // 8-bit
{
signed char *pData = (signed char *)(pWaveData->buffer + sample * sampleSize);
qboolean zero = false;
if( pWaveData->channels == 1 )
{
while( sample < pWaveData->samples && !zero )
{
if( ZERO_X_8( *pData ))
{
zero = true;
}
else
{
sample++;
pData++;
}
}
}
else
{
while( sample < pWaveData->samples && !zero )
{
if( ZERO_X_8( *pData ) && ZERO_X_8( pData[1] ))
{
zero = true;
}
else
{
sample++;
pData++;
}
}
}
}
else
{
short *pData = (short *)(pWaveData->buffer + sample * sampleSize);
qboolean zero = false;
if( pWaveData->channels == 1 )
{
while( sample > 0 && !zero )
{
if( ZERO_X_16( *pData ))
{
zero = true;
}
else
{
pData++;
sample++;
}
}
}
else
{
while( sample > 0 && !zero )
{
if( ZERO_X_16( *pData ) && ZERO_X_16( pData[1] ))
{
zero = true;
}
else
{
sample++;
pData++;
}
}
}
}
}
return sample;
}
//-----------------------------------------------------------------------------
// Purpose: wrap the position wrt looping
// Input : samplePosition - absolute position
// Output : int - looped position
//-----------------------------------------------------------------------------
int S_ConvertLoopedPosition( wavdata_t *pSource, int samplePosition, qboolean use_loop )
{
// if the wave is looping and we're past the end of the sample
// convert to a position within the loop
// At the end of the loop, we return a short buffer, and subsequent call
// will loop back and get the rest of the buffer
if( pSource->loopStart >= 0 && samplePosition >= pSource->samples && use_loop )
{
// size of loop
int loopSize = pSource->samples - pSource->loopStart;
// subtract off starting bit of the wave
samplePosition -= pSource->loopStart;
if( loopSize )
{
// "real" position in memory (mod off extra loops)
samplePosition = pSource->loopStart + ( samplePosition % loopSize );
}
// ERROR? if no loopSize
}
return samplePosition;
}
int S_GetOutputData( wavdata_t *pSource, void **pData, int samplePosition, int sampleCount, qboolean use_loop )
{
int totalSampleCount;
int sampleSize;
// handle position looping
samplePosition = S_ConvertLoopedPosition( pSource, samplePosition, use_loop );
// how many samples are available (linearly not counting looping)
totalSampleCount = pSource->samples - samplePosition;
// may be asking for a sample out of range, clip at zero
if( totalSampleCount < 0 ) totalSampleCount = 0;
// clip max output samples to max available
if( sampleCount > totalSampleCount )
sampleCount = totalSampleCount;
sampleSize = pSource->width * pSource->channels;
// this can never be zero -- other functions divide by this.
// This should never happen, but avoid crashing
if( sampleSize <= 0 ) sampleSize = 1;
// byte offset in sample database
samplePosition *= sampleSize;
// if we are returning some samples, store the pointer
if( sampleCount )
{
*pData = pSource->buffer + samplePosition;
}
return sampleCount;
}
// move the current position to newPosition
void S_SetSampleStart( channel_t *pChan, wavdata_t *pSource, int newPosition )
{
if( pSource )
newPosition = S_ZeroCrossingAfter( pSource, newPosition );
pChan->pMixer.sample = newPosition;
}
// end playback at newEndPosition
void S_SetSampleEnd( channel_t *pChan, wavdata_t *pSource, int newEndPosition )
{
// forced end of zero means play the whole sample
if( !newEndPosition ) newEndPosition = 1;
if( pSource )
newEndPosition = S_ZeroCrossingBefore( pSource, newEndPosition );
// past current position? limit.
if( newEndPosition < pChan->pMixer.sample )
newEndPosition = pChan->pMixer.sample;
pChan->pMixer.forcedEndSample = newEndPosition;
}