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split ConvertMonoToStereoInPlace

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This commit is contained in:
Glenn Maynard
2004-10-25 00:49:42 +00:00
parent fd813fe667
commit bc8bd43b9e
1 changed files with 17 additions and 14 deletions
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stepmania/src/RageSound.cpp
+17 -14
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@@ -280,6 +280,22 @@ void RageSound::RateChange(char *buf, int &cnt,
cnt = (cnt * speed_output_samples) / speed_input_samples;
}
/* Dupe mono to stereo in-place; do it in reverse, to handle overlap. */
void ConvertMonoToStereoInPlace( int16_t *data, int iFrames )
{
int16_t *input = data;
int16_t *output = input;
input += iFrames;
output += iFrames * 2;
while( iFrames-- )
{
input -= 1;
output -= 2;
output[0] = input[0];
output[1] = input[0];
}
}
/* Fill the buffer by about "bytes" worth of data. (We might go a little
* over, and we won't overflow our buffer.) Return the number of bytes
* actually read; 0 = EOF. Convert mono input to stereo. */
@@ -322,20 +338,7 @@ int RageSound::FillBuf( int frames )
if( Sample->GetNumChannels() == 1 )
{
/* Dupe mono to stereo in-place; do it in reverse, to handle overlap. */
int num_samples = cnt / sizeof(int16_t);
int16_t *input = (int16_t *) inbuf;
int16_t *output = input;
input += num_samples;
output += num_samples*2;
while( num_samples-- )
{
input -= 1;
output -= 2;
output[0] = input[0];
output[1] = input[0];
}
ConvertMonoToStereoInPlace( (int16_t *) inbuf, cnt / sizeof(int16_t) );
cnt *= 2;
}