Embedded equipment audio frequency controller and method

Abstract

The invention discloses an audio manage device and the method for an embedded equipment, the method comprises the following steps: step one, a synchronous module builds a synchronous mechanism betweena dummy audio drive module and an audio drive module; step two, the synchronous module controls the operate of the dummy audio drive module using the synchronous mechanism according to the working state of the audio drive module, when a third part operates the dummy audio drive module, so that the sound card is driven to work in time-sharing by the dummy audio drive module and the audio drive module. The invention avoids the conflict of the audio system manage.

Description

technical field [0001] The invention relates to a technology for implementing audio management on an embedded device (such as a mobile phone) to facilitate third-party program transplantation. Background technique [0002] The most typical operating systems currently running on mobile terminals are Linux and WinCE. Taking Linux as an example, general applications interact with the operating system, and these applications are operated through interfaces provided by the operating system (such as driver interfaces). For example, if an application wants to play sound, it needs to interact with the sound card (audio, the same below) driver, and generally operates the sound card by calling functions such as open(), ioctl(), write(), read(), and close() . Common system audio structures such as figure 1 shown. There is a big difference between a simple embedded system and a powerful PC. For example, a simple sound card device does not allow multiple applications to open the soun...

AI Technical Summary

Problems solved by technology

But these sounds have different characteristics. For example, the ringtone of an incoming call can be said to be real-time and has the highest priority. The feature of the button tone is that the priority is relatively low. Generally, when other sounds are playing, the button tone can not be played; the feature of MP3 music is that the playback time is generally very long. During the playback, many other things may happen, there are many Other sounds need to be played. Generally speaking, MP3 music should be paused at this time

When many scenarios are concurrent, you will encounter the problem we mentioned earlier: if an application is using the sound card, all subsequent applications will not be able to use the sound card in time

The advantage of this method is that the transplantation of third-party programs is convenient, but it has the following obvious disadvantages: First, the audio driver needs to be greatly changed, which is an important factor for system instability; second, it should not be done by the driver. In the driver, the structure of the whole system is not clear, the logic is chaotic, the driver and the upper application are heavily interdependent, which is not conducive to transplantation and expansion, and is not conducive to independent development

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