bool AudioFormatWriter::writeFromAudioReader (AudioFormatReader& reader,
int64 startSample,
int64 numSamplesToRead)
{
const int bufferSize = 16384;
AudioSampleBuffer tempBuffer ((int) numChannels, bufferSize);
int* buffers [128] = { 0 };
for (int i = tempBuffer.getNumChannels(); --i >= 0;)
buffers[i] = reinterpret_cast<int*> (tempBuffer.getSampleData (i, 0));
if (numSamplesToRead < 0)
numSamplesToRead = reader.lengthInSamples;
while (numSamplesToRead > 0)
{
const int numToDo = (int) jmin (numSamplesToRead, (int64) bufferSize);
if (! reader.read (buffers, (int) numChannels, startSample, numToDo, false))
return false;
if (reader.usesFloatingPointData != isFloatingPoint())
{
int** bufferChan = buffers;
while (*bufferChan != nullptr)
{
void* const b = *bufferChan++;
if (isFloatingPoint())
FloatVectorOperations::convertFixedToFloat ((float*) b, (int*) b, 1.0f / 0x7fffffff, numToDo);
else
convertFloatsToInts ((int*) b, (float*) b, numToDo);
}
}
if (! write (const_cast <const int**> (buffers), numToDo))
return false;
numSamplesToRead -= numToDo;
startSample += numToDo;
}
return true;
}
bool AudioFormatWriter::writeFromFloatArrays (const float* const* channels, int numSourceChannels, int numSamples)
{
if (numSamples <= 0)
return true;
if (isFloatingPoint())
return write ((const int**) channels, numSamples);
int* chans[256];
int scratch[4096];
jassert (numSourceChannels < numElementsInArray (chans));
const int maxSamples = (int) (numElementsInArray (scratch) / numSourceChannels);
for (int i = 0; i < numSourceChannels; ++i)
chans[i] = scratch + (i * maxSamples);
chans[numSourceChannels] = nullptr;
int startSample = 0;
while (numSamples > 0)
{
auto numToDo = jmin (numSamples, maxSamples);
for (int i = 0; i < numSourceChannels; ++i)
convertFloatsToInts (chans[i], channels[i] + startSample, numToDo);
if (! write ((const int**) chans, numToDo))
return false;
startSample += numToDo;
numSamples -= numToDo;
}
return true;
}
