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Add SoundData:copyFrom

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SoundData:copyFrom(src, srcStart, count, dstStart = 0)
This commit is contained in:
Miku AuahDark
2020-09-22 12:06:26 +08:00
parent 26326a01e0
commit e71441d68b
3 changed files with 43 additions and 0 deletions
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src/modules/sound/SoundData.cpp
+27
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@@ -258,5 +258,32 @@ float SoundData::getSample(int i, int channel) const
return getSample(i * channels + (channel - 1));
}
void SoundData::copyFrom(const SoundData *src, int srcStart, int count, int dstStart)
{
if (channels != src->channels)
throw love::Exception("Channel count mismatch!");
size_t bytesPerSample = (size_t) channels * bitDepth/8;
size_t srcBytesPerSample = (size_t) src->channels * src->bitDepth/8;
// Check range
if (dstStart < 0 || (dstStart+count) * bytesPerSample >= size)
throw love::Exception("Destination out-of-range!");
if (srcStart < 0 || (srcStart+count) * srcBytesPerSample >= src->size)
throw love::Exception("Source out-of-range!");
if (bitDepth != src->bitDepth)
{
// Bit depth mismatch, use get/setSample at loop
for (int i = 0; i < count * channels; i++)
setSample(dstStart + i, src->getSample(srcStart + i));
}
else if (this->data == src->data)
// May overlap, use memmove
memmove(data + dstStart * bytesPerSample, src->data + srcStart * bytesPerSample, count * bytesPerSample);
else
memcpy(data + dstStart * bytesPerSample, src->data + srcStart * bytesPerSample, count * bytesPerSample);
}
} // sound
} // love