static void writePartToOpenFile (LongSound me, int audioFileType, long imin, long n, MelderFile file, int numberOfChannels_override, int numberOfBitsPerSamplePoint) {
long ibuffer, offset, numberOfBuffers, numberOfSamplesInLastBuffer;
offset = imin;
numberOfBuffers = (n - 1) / my nmax + 1;
numberOfSamplesInLastBuffer = (n - 1) % my nmax + 1;
if (file -> filePointer) for (ibuffer = 1; ibuffer <= numberOfBuffers; ibuffer ++) {
long numberOfSamplesToCopy = ibuffer < numberOfBuffers ? my nmax : numberOfSamplesInLastBuffer;
LongSound_readAudioToShort (me, my buffer, offset, numberOfSamplesToCopy);
offset += numberOfSamplesToCopy;
MelderFile_writeShortToAudio (file, numberOfChannels_override ? numberOfChannels_override : my numberOfChannels, Melder_defaultAudioFileEncoding (audioFileType, numberOfBitsPerSamplePoint), my buffer, numberOfSamplesToCopy);
}
/*
* We "have" no samples any longer.
*/
my imin = 1;
my imax = 0;
}
void LongSounds_writeToStereoAudioFile16 (LongSound me, LongSound thee, int audioFileType, MelderFile file) {
try {
long nbuf = my nmax < thy nmax ? my nmax : thy nmax;
long nx = my nx > thy nx ? my nx : thy nx;
long numberOfReads = (nx - 1) / nbuf + 1, numberOfBitsPerSamplePoint = 16;
if (thy numberOfChannels != my numberOfChannels || my numberOfChannels != 1) {
Melder_throw ("LongSounds must be mono.");
}
if (my sampleRate != thy sampleRate) {
Melder_throw ("Sample rates must be equal.");
}
/*
Allocate a stereo buffer of size (2 * the smallest)!
WE SUPPOSE THAT SMALL IS LARGE ENOUGH.
Read the same number of samples from both files, despite
potential differences in internal buffer size.
*/
long nchannels = 2;
autoNUMvector<short> buffer (1, nchannels * nbuf);
autoMelderFile f = MelderFile_create (file);
MelderFile_writeAudioFileHeader (file, audioFileType, my sampleRate, nx, nchannels, numberOfBitsPerSamplePoint);
for (long i = 1; i <= numberOfReads; i++) {
long n_to_write = i == numberOfReads ? (nx - 1) % nbuf + 1 : nbuf;
_LongSound_to_multichannel_buffer (me, buffer.peek(), nbuf, nchannels, 1, i);
_LongSound_to_multichannel_buffer (thee, buffer.peek(), nbuf, nchannels, 2, i);
MelderFile_writeShortToAudio (file, nchannels, Melder_defaultAudioFileEncoding (audioFileType,
numberOfBitsPerSamplePoint), buffer.peek(), n_to_write);
}
MelderFile_writeAudioFileTrailer (file, audioFileType, my sampleRate, nx, nchannels, numberOfBitsPerSamplePoint);
f.close ();
} catch (MelderError) {
Melder_throw (me, ": no stereo audio file created.");
}
}