///FIXME perhaps support extensible wav format
FXbool WavOutput::configure(const AudioFormat & fmt) {
FXushort format;
// Can't handle big endian yet, neither does the output thread handle byteorder swaps
if (fmt.byteorder() != Format::Little)
return false;
// Extensible Wav Format not yet supported
if (fmt.channels>2)
return false;
// Determine format
switch(fmt.datatype()) {
case Format::Unsigned :
case Format::Signed : format = WAV_FORMAT_PCM; break;
case Format::Float : format = WAV_FORMAT_FLOAT; break;
default : return false; break;
}
FXString path=FXPath::unique("gap.wav");
if (file.open(path,FXIO::Writing)) {
GM_DEBUG_PRINT("[wav] opened output file: %s\n",path.text());
af=fmt;
FXuint chunksize=0;
FXlong ldata=0;
/// riff chunk
file.writeBlock("RIFF",4);
file.writeBlock(&chunksize,4); // empty for now
file.writeBlock("WAVE",4);
/// junk chunk
chunksize=28;
file.writeBlock("JUNK",4);
file.writeBlock(&chunksize,4);
file.writeBlock(&ldata,8);
file.writeBlock(&ldata,8);
file.writeBlock(&ldata,8);
chunksize=0;
file.writeBlock(&chunksize,4);
/// fmt
file.writeBlock("fmt ",4);
chunksize=16;
file.writeBlock(&chunksize,4);
file.writeBlock(&format,2);
FXushort channels=fmt.channels;
FXuint rate=fmt.rate;
FXuint byterate=fmt.rate*fmt.channels*fmt.packing();
FXushort blockalign=fmt.framesize();
FXushort bitspersample=fmt.bps();
file.writeBlock(&channels,2);
file.writeBlock(&rate,4);
file.writeBlock(&byterate,4);
file.writeBlock(&blockalign,2);
file.writeBlock(&bitspersample,2);
file.writeBlock("data",4);
chunksize=0xFFFFFFFF;
data_pos=file.position();
file.writeBlock(&chunksize,4);
return true;
}
GM_DEBUG_PRINT("[wav] failed to open output file: %s\n",path.text());
return false;
}
