Musical sound generation device, musical sound generation method, storage medium, and electronic musical instrument

A method executed by a processor in a musical sound generation device that includes, in addition to the processor:

• a performance operation element for receiving a user operation for musical performance;
• a first memory storing a plurality of pieces of waveform data;
• a second memory having an access speed faster than the first memory for temporarily storing data transferred from the first memory;
• a sound source circuit including a waveform reader that can read data only from the second memory for generating digital musical sounds, the method comprising:
• in response to an operation of the performance operation element designating a specific pieces of waveform data, determining whether the designated specific piece of waveform data is already in the second memory, and if not, attempting to allocate a non-ring buffer region or a ring buffer region in the second memory, the non-ring buffer region being to store an entirety of the designated specific piece of waveform data to be read by the waveform reader in response to the operation of the performance operation element, the ring buffer region being to store the designated specific piece of waveform data as a ring buffer so as to be updated by data from the first memory and read by the waveform reader in a ring-buffer manner in response to the operation of the performance operation element;
• in attempting to allocate the non-ring buffer region or the ring buffer region, first determining whether the non-ring buffer region sufficient to receive the designated specific piece of waveform data can be allocated in the second memory, and if so, transferring the designated specific piece of waveform data from the first memory to the non-ring buffer region of the second memory;
• and
• if the non-ring buffer region sufficient to receive the designated specific piece of waveform data cannot be allocated in the second memory, attempting to allocate the ring buffer region in the second memory, and if allocated, transferring the designated specific piece of waveform data from the first memory to the ring buffer region of the second memory in the ring-buffer manner so as to be accessible by the waveform reader as the ring buffer.

A computer-readable non-transitory storage medium having stored thereon a program to be executable by a processor in a musical sound generation device that includes, in addition to the processor:

• a performance operation element for receiving a user operation for musical performance;
• a first memory storing a plurality of pieces of waveform data;
• a second memory having an access speed faster than the first memory for temporarily storing data transferred from the first memory;
• a sound source circuit including a waveform reader that can read data only from the second memory for generating digital musical sounds, the program causing the processor to perform the following:
• in response to an operation of the performance operation element designating a specific pieces of waveform data, determining whether the designated specific piece of waveform data is already in the second memory, and if not, attempting to allocate a non-ring buffer region or a ring buffer region in the second memory, the non-ring buffer region being to store an entirety of the designated specific piece of waveform data to be read by the waveform reader in response to the operation of the performance operation element, the ring buffer region being to store the designated specific piece of waveform data as a ring buffer so as to be updated by data from the first memory and read by the waveform reader in a ring-buffer manner in response to the operation of the performance operation element;
• in attempting to allocate the non-ring buffer region or the ring buffer region, first determining whether the non-ring buffer region sufficient to receive the designated specific piece of waveform data can be allocated in the second memory, and if so, transferring the designated specific piece of waveform data from the first memory to the non-ring buffer region of the second memory;
• and
• if the non-ring buffer region sufficient to receive the designated specific piece of waveform data cannot be allocated in the second memory, attempting to allocate the ring buffer region in the second memory, and if allocated, transferring the designated specific piece of waveform data from the first memory to the ring buffer region of the second memory in the ring-buffer manner so as to be accessible by the waveform reader as the ring buffer.