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LG Monitor Drivers for Windows. These drivers are designed to work with all LG Monitors by type.If your Monitor Type is not listed, the Generic PnP Drivers supplied by your Operating System provide full functionality (no added advantage to product specific drivers). All smartphones come with a USB port through which they can be connected to a PC or another device. Although the Windows and Mac both come with preinstalled USB drivers for a large number of gadgets and manufacturers, there are chances that it may not work in a proper manner due to a software glitch or any other similar issue.

Technical Note TN2274

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.

Artifact-free Streaming

USB Audio Controls

Descriptive Naming

Supported USB Audio 2.0 Features

Background

This document assumes the reader is familiar with the Core Audio framework, Audio HAL, I/O Kit basics and USB fundamentals. Please review these documents for more information:

Note: There is often confusion when referencing the various USB related specifications. See Table 1 for a summary of the terms used in this article to reference USB specifications.

**Table 1** Terminology used in this document to reference USB related specifications.
Terms used in this document	Reference
USB Audio 1.0 USB Audio 2.0	Revisions of the USB Device Class Definition for Audio Devices
USB Audio Data Formats 1.0USB Audio Data Formats 2.0	Revisions of the USB Device Class Definition for Audio Data Formats
USB 1.0USB 1.1USB 2.0	Revisions of the Universal Serial Bus Specification

The reader is strongly encouraged to review the documents in Table 1.

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.)

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. Please see the Audio Device Driver Programming Guide 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 1.0devices	USB Audio 2.0devices	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.

In order to combine multiple streams on one engine, the following criteria must be met by the stream interfaces:

All sample rate sets must match. Pokemon diamond randomizer rom.
The same synchronization type is used for all interface alternate settings.
The streams reside in the same clock domain.

Illmind drum kit free. Please note the following behaviors of streams that occupy the same engine:

These streams operate in the same time domain and sample rate setting (but not necessarily the same format.)
These streams cannot be activated independently. They will always start and stop together.

Important: If a device is designed to combine multiple streams on a single engine, it must support starting multiple streams at the same time. If the device needs more time to do this, consider increasing the lock delay (see Section 4.6.1.2 of the USB Audio 1.0 Spec and Section 4.10.1.2 of the USB Audio 2.0 Spec.)

Artifact-free Streaming

The primary and most important function of the AppleUSBAudio driver is to support reliable, artifact-free audio streaming. Developers can aid the driver in achieving this goal by selecting the appropriate endpoint descriptor values for synchronization type and maximum packet size.

Endpoint Synchronization Types

To maintain glitch-free audio, AppleUSBAudio must regularly present timestamps to Core Audio that accurately represent the audio data

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