Mobile phones audio frequency playing method

Abstract

The invention relates to a mobile phone audio play method which adopts an audio driver of multi audio play. The method includes the following steps: an application program or process is directly called; the application program or process controls the write in of corresponding sound data and the priority of the sound data inside a play list set up by the audio driver; the audio driver transmits the sound data to a play buffer area according to the priority; finally, the sound data is transmitted to audio equipment through the play buffer area to be played. The method, which adds a play list recording a plurality of parallel sound data inside the audio driver, selects the sound data of higher priority to play; moreover, the method can also select the sound data needing to be played at the same time to be played after being mixed with the sound data of higher priority; therefore, the method avoids the complicated interprocess communication, synchronization and mass data transmission caused by single sound service program management; meanwhile, adopting an extended universal standard interface function ensures relatively simple program portability and fully meets the requirements of sound play management of a mobile phone.

Description

technical field [0001] The invention relates to sound management of an embedded operating system, in particular to an audio playing method in a wireless mobile terminal. Background technique [0002] At present, the most typical embedded operating systems on mobile phones and PDA terminals are Linux and WinCE. Taking Linux as an example, the general application program plays sound, and usually calls the sound interface functions such as open(), ioctl(), write(), read(), close() in the Linux operating system, and the audio driver operates the audio device to complete the specific play. [0003] When the audio driver is called by the application, it can create a DMA data buffer in memory, such as figure 1 , including several buffer units. Play sound methods for existing audio drivers such as figure 2 , including: 210) start; 220) judge whether there is sound data in the DMA data buffer; yes, proceed to step 230); no, enter the next step; 221) wait for data, return to step...

AI Technical Summary

Problems solved by technology

However, this method is applied to the embedded operating systems of terminals such as mobile phones and PDAs, and there are two obvious disadvantages: (1) the service program is complicated to implement, and multiple situations must be considered: simple ring tones can directly use the file name as the message parameter , the service program calls the codec to decompress, and directly operates the sound card to play; for MP3 music, since the MP3 player has already called the codec to decompress, the service program only needs to write the unpacked data directly to the sound card for playback, but it needs to cons

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