PCM constants defined by the shapepcmcontext.h file.
SHAPE_PCM_CIRCULAR_BUFFER_ALIGNMENT
SHAPE_PCM_INFINITE_LOOP_COUNT
SHAPE_PCM_MAX_BUFFER_LENGTH
SHAPE_PCM_MAX_LOOP_COUNT
SHAPE_PCM_READ_POINTER_MASK
SHAPE_PCM_UPDATE_BUFFER_LENGTH
SHAPE_PCM_UPDATE_BUFFER_START
SHAPE_PCM_UPDATE_FORMAT
SHAPE_PCM_UPDATE_FULL
SHAPE_PCM_UPDATE_LOOP_COUNT
SHAPE_PCM_UPDATE_LOOP_END
SHAPE_PCM_UPDATE_LOOP_START_WRITE_POINTER
SHAPE_PCM_UPDATE_MASK
SHAPE_PCM_UPDATE_MODE
SHAPE_PCM_UPDATE_READ_POINTER