REQUIRED_IF
REQUIRED_IF(wav != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(ai.blocksize != 0);
REQUIRED_IF(data != NULL);
REQUIRED_IF(ai.blocksize != 0);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);
REQUIRED_IF(buf != NULL);