초록 ▼

An extensible kernel-mode audio (e.g., MIDI) processing architecture is implemented using multiple modules that together comprise a module graph. The module graph is implemented in kernel-mode, reducing latency and jitter when handling audio data by avoiding transfers of the audio data to user-mode

An extensible kernel-mode audio (e.g., MIDI) processing architecture is implemented using multiple modules that together comprise a module graph. The module graph is implemented in kernel-mode, reducing latency and jitter when handling audio data by avoiding transfers of the audio data to user-mode applications for processing. In one embodiment, the audio processing architecture is readily extensible. A graph builder can readily change the module graph, adding new modules, removing modules, or altering connections as necessary, all while the graph is running.

대표청구항 ▼

The invention claimed is: 1. A computer-readable medium having stored thereon a data structure, the data structure comprising: a presentation time portion indicating when audio data is to be rendered; a data portion that can include audio data, a pointer to a data buffer, or a pointer to a chain of

The invention claimed is: 1. A computer-readable medium having stored thereon a data structure, the data structure comprising: a presentation time portion indicating when audio data is to be rendered; a data portion that can include audio data, a pointer to a data buffer, or a pointer to a chain of additional data structures that include the audio data; an event byte count portion that identifies whether the data portion includes the audio data or the pointer to the data buffer; and a flag portion that is set to indicate to a kernel-mode transform filter that the data portion includes the pointer to the chain of additional data structures rather than the audio data or the pointer to the data buffer. 2. A computer-readable medium as recited in claim 1, wherein the data structure further comprises a structure byte count portion that identifies the size of the data structure. 3. A computer-readable medium as recited in claim 1, wherein the event byte count portion identifies a number of data bytes that are referred to in the data portion. 4. A computer-readable medium as recited in claim 1, wherein the data structure further comprises a channel group portion that identifies which of a plurality of channel groups the data identified in the data portion corresponds to. 5. A computer-readable medium as recited in claim 1, wherein the data structure further comprises a byte position portion including an identifier of where the data structure is situated among a plurality of data structures received from an application. 6. A computer-readable medium as recited in claim 1, wherein the data structure further comprises a next event portion including an identifier of a next data structure in a chain of data structures. 7. A method of processing audio data in a privileged level module, the method comprising: receiving a data packet, the data packet including: a presentation time portion indicating when audio data is to be rendered; a data portion that can include audio data, a pointer to a data buffer, or a pointer to a chain of additional data packets that include the audio data; an event byte count portion that identifies whether the data portion includes the audio data or the pointer to the data buffer; and a flag portion that is set to indicated to a kernel-mode transform filter that the data portion includes the pointer to the chain of additional data packets rather than the audio data or the pointer to the data buffer; and determining that the data portion includes a pointer to a chain of additional data packets based on the flag portion; and carrying out a programmed operation on each of the additional data packets. 8. A computer-readable memory containing a computer program that is executable by a computer to perform the method recited in claim 7. 9. A method of processing audio data in a kernel-mode transform filter, the method comprising: passing, to another kernel-mode transform filter, a data packet, the data packet including: a presentation time portion indicating when audio data is to be rendered; a data portion that can include audio data, a pointer to a data buffer, or a pointer to a chain of additional data packets that include the audio data; an event byte count portion that identifies whether the data portion includes the audio data or the pointer to the data buffer; and a flag portion that is set to indicate to a kernel-mode transform filter that the data portion includes the pointer to the chain of additional data packets rather than the audio data or the pointer to the data buffer; and configuring the data portion to include a pointer to a chain of additional data packets that include audio data; and indicating that the data packet includes the pointer by setting a package event flag in the flag portion. 10. A computer-readable memory containing a computer program that is executable by a computer to perform the method recited in claim 9.