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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
View File
@@ -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
src/modules/sound/SoundData.h
+2
View File
@@ -61,6 +61,8 @@ public:
float getSample(int i) const;
float getSample(int i, int channel) const;
void copyFrom(const SoundData *src, int srcStart, int count, int dstStart);
private:
void load(int samples, int sampleRate, int bitDepth, int channels, void *newData = 0);
src/modules/sound/wrap_SoundData.cpp
+14
View File
@@ -121,6 +121,19 @@ int w_SoundData_getSample(lua_State *L)
return 1;
}
int w_SoundData_copyFrom(lua_State *L)
{
SoundData *dst = luax_checksounddata(L, 1);
const SoundData *src = luax_checksounddata(L, 2);
int srcStart = (int) luaL_checkinteger(L, 3);
int count = (int) luaL_checkinteger(L, 4);
int dstStart = (int) luaL_optinteger(L, 5, 0);
luax_catchexcept(L, [&](){ dst->copyFrom(src, srcStart, count, dstStart); });
return 0;
}
static const luaL_Reg w_SoundData_functions[] =
{
{ "clone", w_SoundData_clone },
@@ -131,6 +144,7 @@ static const luaL_Reg w_SoundData_functions[] =
{ "getDuration", w_SoundData_getDuration },
{ "setSample", w_SoundData_setSample },
{ "getSample", w_SoundData_getSample },
{ "copyFrom", w_SoundData_copyFrom },
{ 0, 0 }
};