pbitsdev@gmail.com

I am trying to write audio files (.aif) from an msp external i am working on.

A file is written successfully, however, it does not open

in QT for example (stating end-of-file not found).

I am wondering where I am going wrong. Do I not have to write .aiff header information before writing my data or is this

handled by the sys API since I specify my file type as being 'AIFF'.

    // create file name to save .aif file as

    char fileName[256] = "doormouse";

    long fileSizeBytes = sizeof(float) * wsf->tableSize;

    err = path_createsysfile(fileName, path, type, &fh);

        error("writesf~: error %d creating file", err);

    err = sysfile_write(fh, &wsf->tableSize, wsf->table);

        error("writesf~: error %d writing file", err);

    sysfile_seteof(fh, fileSizeBytes);    // state end-of-file

    post("writesf~: wrote file %s sucessfully", fileName);

I am trying to write audio files (.aif) from an msp external i am working on.
A file is written successfully, however, it does not open
in QT for example (stating end-of-file not found).

I am wondering where I am going wrong. Do I not have to write .aiff header information before writing my data or is this
handled by the sys API since I specify my file type as being 'AIFF'.

	// create file name to save .aif file as
	char fileName[256] = "doormouse";
	short path = defvolume();
	long type = 'AIFF';
	t_filehandle fh;
	long fileSizeBytes = sizeof(float) * wsf->tableSize;
	short err;

	// First: Create File
	err = path_createsysfile(fileName, path, type, &fh);
	if(err) {
		fh = 0;
		error("writesf~: error %d creating file", err);
		return;
	}

	// Second: Write File
	err = sysfile_write(fh, &wsf->tableSize, wsf->table);
	if(err) {
		error("writesf~: error %d writing file", err);
		return;
	}

	// Third: Close File
	sysfile_seteof(fh, fileSizeBytes);	// state end-of-file
	sysfile_close(fh);
	post("writesf~: wrote file %s sucessfully", fileName);

sysfile_write-aiff

I'm pretty sure that creating the file as AIFF just tells the OS that the file should be treated as an AIFF file (regardless of whether the data is valid). Looking at your code you'll have a RAW 32-bit floating point audio file.

You need to write the data into the file according to the AIFF spec. So yes you'd need to write header data and audio data as AIFF "chunks". You'd probably need to convert the floating point format to 8, 16, 24 or 32 bit signed ints too, I'm fairly sure AIFF doesn't support float.

http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/

I found this which might be helpful:
http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/

Yah, Bourke's AIFF tutorial is ver helpful.

I will relook at my code and try and write header data.

sysfile_write: .aiff