Hi ppl, first sorry if my english isn't good as I would like.
About this topic, I'm working in a partial port of VLC to N770, my primary target is play an mpeg2-ts stream obtained via wifi from a dreambox 7000S STB (sat TV receiver). The stream consumed is 528x576 4:3 25 fps. I've a partial success on this by now. Currently video decoding/output at 35 fps with audio disabled, taking only luma info for a black/white fast colorspace conversion mixed with a half scaling(pixel skiping). My project is build on top of the following components: - VLC: gui, control operation, network layer, video output(SDL module:colorspace conversion YUV2RGB and stretching) - libdvbpsi: stream demux - libmpeg2: video decoding - libmad: audo decoding I modified it in the following way: 1. libmpeg2: implemented a fast IDCT8 using EDSP extensions and minimize memory operations. I've done some experiments with and IDCT4 implementation in order to reduce workload. 2. libmpeg2: skip IDCT for U and V blocks. 3. vlc(SDL video output module): stretching via pixel skiping mixed with fast colospace conversion RGB = YYY. I've thinking that a fixed point colospace conversion rutine using EDSP could be good for my project than the actual SDL implementation that uses an array of precalculated values but I'm not sure on that. Now I'm studing audio problem, libmad is a bad choice because it uses 32 bits fixed point operations(can't be beneficed of 16bits MUL and MAC EDSP operations) and ARM is stressed doing video decoding, etc... I would like use DSP in order to do audio decoding and balance the work. First I thought that I should to implement an DSP audio codec, but when I was studing DSP bridge I found that dsptask 11 is named "mp2dec" is it an mpeg2 audio decoder. / $ cat /sus/bus/dsptask/devices/dsptask11/devname mp2dec Is it an mpeg2 audio decoder implemented on DSP ? Can you give me info about how I could use it in my project ? I've been reading a bit about gstreamer but I never used it. Reading the web tutorial I've got the impression that in order to use gstreamer properly it must be the main thread, it seems bad for vlc arch, I would like to use dspcodec directly, dropping on it the audio frames demuxed for libdvbpsi, can it be done? Could you give me some info on this topic or an appointment on how to use gstreamer in a slave fashion. About gstreamer, samples that I found are related to command line tools, could you appoint me about how to use it from C. Thanks in advance. Josep Torra Valles http://n770galaxy.blogspot.com/ _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://maemo.org/mailman/listinfo/maemo-developers
