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Important: This document is no longer being updated. For the latest information about Apple SDKs, visit the. To successfully design a class compliant USB audio device that works seamlessly with the Mac, it is important to understand the features of the Mac's USB audio class driver, AppleUSBAudio. This document explains the driver's architecture, features, and algorithms available in Mac OS X v10.6 and later. It also includes a section discussing recently enhanced support for devices that comply with the USB Device Class Definition for Audio Devices 2.0 specification. The insights and design tips presented here are intended to assist device developers in creating high quality plug-and-play USB audio devices. Class Driver Overview AppleUSBAudio is an I/O Kit based kernel driver that is designed to support both USB Audio 1.0 and USB Audio 2.0 class compliant devices. Figure 1 shows where AppleUSBAudio fits in the Mac OS X audio stack architecture. In addition to transporting audio data between the hardware and the host’s sample buffer, it also communicates format and control changes between the host and the device (like volume, mute, format, input/clock source, etc.) AppleUSBAudio presents these hardware resources to applications through the HAL (audio hardware abstraction layer.) Figure 1 AppleUSBAudio in the Mac OS X audio stack The AppleUSBAudio driver communicates to devices via the USB transport, using the IOUSBFamily APIs. AppleUSBAudio builds upon the IOAudioFamily layer which provides general audio driver functions like maintaining the sample and mix buffers, facilitating communication over the kernel and user space boundary through user clients, and more. To care for hardships through your drivers, you must have to concentrate on typically the kind of this kind of Printer approach that you will be receiving difficulties making use of (is it advisable to get specific to increase the actual Drivers directly, only for fantastic Driver revise usually Driver Modify Handy tool could find the real Driver within your condition). Download all the Driver Assemblage consultant underneath. Canon bjc 600. You must strengthen your Printer Drivers typically to keep up your current products, one example is, any first printer operating correctly. When you have the necessary things, it is straightforward to view most of the Printer website with regards to your particular custom-made drivers as well as, need to obtainable, download and set up of these kinds of drivers. Prv Car AudioPlease see the for more details. AppleUSBAudio is a mature driver that supports many USB Audio 1.0 and 2.0 features. ![]() Table 2 highlights some of the supported features that are discussed in this article. Table 2 Supported features in AppleUSBAudio. A checkmark in the “USB Audio 1.0” column means that this feature is supported for USB Audio 1.0 devices. The same follows for the “USB Audio 2.0” column. Feature USB Audio 1.0 devices USB Audio 2.0 devices Notes Document section Input stream sample synchronous to output stream X X Streams must meet requirements to occupy the same engine Unified Engine Model Synchronous endpoints X X Endpoint Synchronization Types Output adaptive endpoints X X Usually paired with an asynchronous input endpoint. Input adaptive endpoints are not supported. Endpoint Synchronization Types Asynchronous endpoints X X Endpoint Synchronization Types Status interrupts X X Device informs host of volume, mute, input selector, clock validity Status Interrupts Predefined and custom channel names X X Uses iChannelNames Descriptive Naming Clock entity descriptors X Clock Source, Clock Selector, Clock Multiplier Clock Entities High speed isochronous audio data transfers X Can support high channel count/sample rates. Example: 10 channels of input and 10 channels of output, 32-bit @ 192 kHz High Speed Streaming. Unified Engine Model AppleUSBAudio represents the streams of a USB audio device to the application layer using IOAudioFamily's IOAudioStream entities. One or more streams are associated with each engine. In Mac OS v10.5.6 and earlier, AppleUSBAudio restricted each engine to one stream only. Then in v10.5.7, AppleUSBAudio’s engine model was redesigned to combine multiple streams per engine when possible. In cases where input and output streams can reside on the same engine, this architecture achieves sample synchronization and consistent latencies between streams.
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