The audio is composed of two parts: decoder and mixer.
* There can be mufti decoders active at same time,
* All the result of decoders goes in to mixer
* Input of decoder is encoded frames, out put of decoder is PCM
* input of mixer is connected to the output decoder, mixer mix all the streams to one stream.
aac -- aac decoder -- PCM \
amr -- amr decoder -- PCM - Mixer -- PCM
mp3 -- mp3 deocder -- PCM /
There is one DSP. aac/amr/mp3 decoder applet and mixer applet share the DSP resource.
A non-preemptive OS is controlling all the applets.
A DSP session example
AMR Decoder --> Volume Control --> FormatConversion --> Sample Rate Conversion --> Effects --> Audio Render.
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