Simon Pickering a écrit : > >> If the DSP in not the limitation, then the N800 could be used for a >> funny project I have now in my head. I there any documentation on how to >> program a Linux application to use some existing DSP tasks available >> on the N800? I am interesting about the MP3 decoder and a pair of low >> bandwidth coder/decoder like G711, G729 or ILBC. > > There is source available for the ARM-side part of the gstreamer sinks > (http://repository.maemo.org/pool/chinook/free/source/g/gst-plugins-dsp0.10/). > > That should show you how to use the dsp tasks. > > There's a fundamental problem though, the mp3 dsp task sends its data > directly to the audio codec (hardware) on the DSP-side, therefore you're > probably not going to be able to access the raw data to reencode it as > something else (unless it is also exposed in a buffer in shared memory). > > I am debugging an mp3 dsptask at the moment, so you may yet have > something to play with at some point in the near future if you can't get > the built-in tasks to work as you wish. > > Cheers,
Hi Simon, Thanks for your explanation. After having read the basic Gstreamer documentation, I understand better the sink pad concept of the mp3 task. In the application I am thinking about now, I don't need to look at the raw audio data decoded by the MP3 task as long as I can mix with it an other raw audio stream. I fact I need to mix a MP3 stream and a G711|G729|ILBC|AMR stream. You can see it as a kind of karaoke: mixing music (MP3) and voice (low bandwidth codec). The result should simply be available on the output jack. Did you think it is already doable now ? Best Regards, -- Jean-Christian de Rivaz _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
