Incoming Call, Voice Streamer ModuleTarget device: Nokia Series 60 v2 running Symbian 7. e.g Nokia 6600When the app is started it will run as a background process listening for an incoming call. When an incoming call is detected, a dialog will popup allowing the user to hook into the callAnd start the animated character application. If the user confirms this, it will record the audio from the incoming call and place the audio in a buffer which is accessible for processing. It will also start an application that will come to the foreground and display graphics to the screen. Note: Nokia series 60 phones beep every few seconds to notify that a call is being recorded. Sony Ericsson phones do not allow any call recording. The deliverable can be divided into two components: 1. Engine DLL The media server can stream data from either the microphoneon the device or from call. The data is streamed at 8Khz 168bit PCM. 2. Test APPA test front end application which loads the DLL and has asimple graphic display showing real time audio amplitude.Technical details: In Symbianland all buffers tend to be descriptors, also, once the mediaserver is busy with a descriptor, it isnt safe to use its data until the mediaserver is done with it. So to handle this, an array of smallish descriptorbuffers are used to handle the streamed audio from the media server. Worse thanthat is that I think people have found that its safer to run the recorder bitin its own thread. If one doesnt do this, then some folk have reported jerky,intermittant audio, which is not good. But essentially an interface similar tothe one below is possible... The buffer should support at least 100ms of sound which will be need for normalisation processing.Interface Requirements to Buffer:(Loosely based on DirectX9 CaptureBuffer)class CaptureBuffer public: CaptureBuffer() CaptureBuffer(int initSize) int getReadPosition() position that it is safe to read from int getCapturePosition() position that data is being written at int getBufferSize() size of internal buffer char read(int offset, int count) returns count bytes starting at offset bool start() start recording bool stop() stop recording private: char bufferLater on, we can add methods to get notifications, like when the write pointer wraps around, and timednotifications. Look at the DirectX9 CaptureBuffer class for inspiration.This wrapper class will probably not be necessary as long as the descriptor with the datais available for processing. Any threading related risks, should be managed though.
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