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optimized WrappedMemoryStream::readBuffer (It's almost 3 AM, so I don't trust myself, hence I'll leave this as an #ifdef for now :-)

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svn-id: r9473
This commit is contained in:
Max Horn 2003-08-05 00:50:15 +00:00
parent b96e5501e6
commit b1d3b7ab99
1 changed files with 19 additions and 2 deletions
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21
sound/audiostream.cpp
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@ -72,9 +72,10 @@ public:
int samples = 0;
while (samples < numSamples && !eosIntern()) {
const int len = MIN(numSamples, (_end - _ptr) / (is16Bit ? 2 : 1));
for (; samples < len; samples++) {
while (samples < len) {
*buffer++ = readSample<is16Bit, isUnsigned>(_ptr);
_ptr += (is16Bit ? 2 : 1);
samples++;
}
if (_loopPtr && _ptr == _end) {
_ptr = _loopPtr;
@ -143,10 +144,26 @@ inline int16 WrappedMemoryStream<stereo, is16Bit, isUnsigned>::readIntern() {
template<bool stereo, bool is16Bit, bool isUnsigned>
int WrappedMemoryStream<stereo, is16Bit, isUnsigned>::readBuffer(int16 *buffer, int numSamples) {
int samples;
int samples = 0;
#if 1
for (int i = (_pos > _end) ? 0 : 1; i < 2 && samples < numSamples && !eosIntern(); i++) {
const byte *endMarker = (i == 0) ? _bufferEnd : _end;
const int len = MIN(numSamples, (endMarker - _pos) / (is16Bit ? 2 : 1));
while (samples < len) {
*buffer++ = readSample<is16Bit, isUnsigned>(_pos);
_pos += (is16Bit ? 2 : 1);
samples++;
}
// Wrap around?
if (_pos >= _bufferEnd)
_pos = _pos - (_bufferEnd - _bufferStart);
}
#else
for (samples = 0; samples < numSamples && !eosIntern(); samples++) {
*buffer++ = readIntern();
}
#endif
return samples;
}