fix bug: source file needs to be explicitly rewound before reading/writing in callback mode
fix bug: source file needs to be explicitly rewound before reading/writing in callback mode

LordJZ/libflac,LordJZ/libflac,fredericgermain/flac,Distrotech/flac,kode54/flac,LordJZ/libflac,Distrotech/flac,kode54/flac,kode54/flac,Distrotech/flac,kode54/flac,fredericgermain/flac,waitman/flac,waitman/flac,waitman/flac,Distrotech/flac,waitman/flac,fredericgermain/flac,LordJZ/libflac,waitman/flac,fredericgermain/flac