Isochronous audio network software interface

• US 8,583,269 B2
• Filed: 03/03/2011
• Issued: 11/12/2013
• Est. Priority Date: 11/07/2003
• Status: Expired due to Fees

• Current Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Original Assignee: Harman International Industries Incorporated (Samsung Electronics Co. Ltd.)
• Inventors: Buckwalter, Paul Benjamin
• Primary Examiner(s): Tsang, Fan
• Assistant Examiner(s): SIEGEL, DAVID F
• Application Number:
  US13/039,898
• Publication Number:
  US 20110153049A1
• Time in Patent Office: 985 Days
• Field of Search: 709/231, 715/227, 700/94
• US Class Current: 700/94
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation

Abstract

A computer system includes a network interface that transmits and/or receives packets over a network. The packets may include isochronous audio packets and data packets. The computer system may have an operating system in which isochronous audio software is executable to extract audio data from the isochronous audio packets, or format audio data into isochronous audio packets. The system may also include other software executable within the operating system substantially in parallel with the isochronous audio software. The other software may extract data from the data packets.

Claims

1. A computer system, comprising:

a memory; and

a processor in communication with the memory, the memory comprising computer instructions executable by the processor, the computer instructions comprising;

an isochronous audio application executable to format audio data received from a source of audio data; and

an isochronous audio driver in communication with the isochronous audio application, the isochronous audio driver executable to convert the formatted audio data to isochronous audio data and buffer the isochronous audio data, where the isochronous audio driver and the isochronous audio application are executable within a multi-tasking operating system;

where the isochronous audio driver is further executable to generate an isochronous audio packet that includes the buffered isochronous audio data, and the isochronous audio packet is for transmission over the switched network; and

where, in response to only one interrupt request generated by the multi-tasking operating system, the isochronous audio application and the isochronous audio driver execute sequentially as a group without interruption to process the audio data and generate the isochronous audio packet for transmission over the switched network.

2. The computer system of claim 1, where the isochronous audio driver is executable to receive data packets from a protocol stack executable within the multi-tasking operating system and to provide the data packets to a network driver for transmission over the switched network, the data packets including information unassociated with the isochronous audio data.

3. The computer system of claim 1, where the isochronous audio packet is formatted in accordance with a CobraNet specification.

4. The computer system of claim 1, where the isochronous audio driver is executable to generate the isochronous audio packet in response to receipt of a synchronization packet.

5. The computer system of claim 1, where the isochronous audio driver includes a packet request module configured to request the formatted audio data from the isochronous audio application whenever a packet supply buffer included in the isochronous audio driver is less than full.

6. The computer system of claim 1, where the isochronous audio driver includes a packet request module, a packet supply buffer module and a packet format module, where the packet request module is configured to monitor the packet supply buffer and request additional audio data from the isochronous audio application whenever the packet supply buffer is not full, and the packet format module is configured to extract the audio data from the packet supply module and format the audio data to form the isochronous audio data.

7. The computer system of claim 1, where the isochronous audio data includes data indicative of the resolution of a plurality of audio data samples included in the isochronous audio data, data indicative of the frequency of the audio data samples, and data indicative of the number of channels of audio data that are included in the isochronous audio data.

8. A computer system, comprising:

a memory; and

a processor in communication with the memory, the memory comprising computer instructions executable by the processor, the computer instructions comprising;

a network interface driver executable within a multi-tasking operating system to receive a stream of packets over a switched network for an application, the stream of packets including isochronous audio packets; and

isochronous audio software executable within the multi-tasking operating system to process the stream of packets and provide audio data included in the isochronous audio packets to the application; and

where, in response to a single interrupt request provided by the multi-tasking operating system, the network interface driver, the isochronous audio software, and the application are executed as a group without interruption to process the isochronous audio packets received via the switched network.

9. The computer system of claim 8, where the isochronous audio packets are a first set of isochronous audio packets, and where the isochronous audio software is further executable to generate, and initiate transmission of, a second set of isochronous audio packets in response to receipt of a synchronization packet over the switched network.

10. The computer system of claim 8, where the application is a first application, and the isochronous audio software is further executable to pass data packets that are received over the switched network to a second application through a protocol stack without any processing of the data packets by the isochronous audio software.

11. The computer system of claim 8, where the isochronous audio software comprises an isochronous audio driver executable at a driver level of the multi-tasking operating system.

12. The computer system of claim 8, where the isochronous audio software comprises an isochronous audio driver and the multi-tasking operating system is operable in a safe mode in which the isochronous audio driver is enabled to be executed and the application is disabled.

13. The computer system of claim 8, where the isochronous audio software is configured to be executable in a pre-configured and pre-existing operating system utilizing pre-existing and pre-configured hardware.

14. The computer system of claim 8, where the audio data in the isochronous audio packets is uncompressed.

15. A computer implemented method of communicating audio over a switched network, comprising:

receiving a stream of packets from the switched network via a network interface, the stream of packets including isochronous audio packets;

generating a first interrupt request to a multi-tasking operating system by the network interface in response to receipt of the stream of packets;

receiving with the network interface a second interrupt request generated by the multi-tasking operating system;

providing the stream of packets to an isochronous audio driver with a network interface driver executable within the multi-tasking operating system, the providing the stream of packets being in response to receipt of the second interrupt request;

processing the stream of packets with the isochronous audio driver in response to the receipt of the second interrupt request by passing isochronous audio data included in the isochronous audio packets to an isochronous audio application from the isochronous audio driver; and

executing, with the multi-tasking operating system, the network interface driver and the isochronous audio driver substantially in parallel with the isochronous audio application, where providing the stream of packets to the isochronous audio driver, processing the stream of packets with the isochronous audio driver, and passing the isochronous audio data to the isochronous audio application are executed in the multi-tasking operating system without interruption in response to a single interrupt request from the multi-tasking operating system, and where the single interrupt request is included in the second interrupt request.

16. The method of claim 15, where the stream of packets includes data packets unrelated to the isochronous audio packets, processing the stream of packets with the isochronous audio driver further comprises passing the data packets unmodified from the isochronous audio driver to a protocol stack, the protocol stack being for communication on the switched network by at least one application, and the protocol stack and the at least one application are executed substantially in parallel with the network interface driver, the isochronous audio driver, and the isochronous audio application.

17. The method of claim 16, where the isochronous audio packets are transmitted in response to receipt of a synchronization packet and the data packets are not transmitted in response to receipt of the synchronization packet.

18. The method of claim 15, where processing the stream of packets with the isochronous audio driver further comprises determining whether a packet is an isochronous audio packet.

19. The method of claim 15 further comprising extracting the isochronous audio data with the isochronous audio driver.

20. The method of claim 15, further comprising extracting the isochronous audio data from the isochronous audio packets with the isochronous audio application, where passing the isochronous audio data to the isochronous audio application from the isochronous audio driver comprises passing the isochronous audio packets to the isochronous audio application.