Symbian incoming call stream

Incoming Call, Voice Streamer Module

Target device: Nokia Series 60 v2 running Symbian 7. e.g Nokia 6600

When 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 call

And 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 microphone

on the device or from call. The data is streamed at 8Khz 16/8-bit PCM.

2. Test APP

A test front end application which loads the DLL and has a

simple graphic display showing real time audio amplitude.

Technical details:

In Symbian-land all buffers tend to be descriptors, also, once the media

server is busy with a descriptor, it isn't safe to use its data until the media

server is done with it. So to handle this, an array of smallish descriptor

buffers are used to handle the streamed audio from the media server. Worse than

that is that I think people have found that its safer to run the 'recorder' bit

in its own thread. If one doesn't do this, then some folk have reported jerky,

intermittant audio, which is not good. But essentially an interface similar to

the 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 {



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


char* buffer;


Later on, we can add methods to get notifications, like when the write

pointer wraps around, and timed

notifications. Look at the DirectX9 CaptureBuffer class for inspiration.

This wrapper class will probably not be necessary as long as the descriptor with the data

is available for processing. Any threading related risks, should be managed though.

Habilidades: Programação C, Wireless

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Acerca do Empregador:
( 0 comentários ) Cape Town, South Africa

ID do Projeto: #6023

8 freelancers estão ofertando em média $366 nesse trabalho


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$500 USD in 18 dias
(3 Comentários)

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$100 USD em 1 dia
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$450 USD in 15 dias
(1 Comentário)

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$100 USD em 1 dia
(0 Comentários)

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$500 USD in 20 dias
(0 Comentários)

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$480 USD in 20 dias
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$207 USD in 9 dias
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$300 USD in 10 dias
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$500 USD em 1 dia
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