Most formats are split into blocks of audio and video. You should also setup your streams (looking at examples usually explains most things, except perhaps timestamp information) set codec_type, codec_id, and possibly width, height, pix_fmt for video, and channels, sample_rate, bits_per_sample, and bit_rate for audio. the frame width if it is video, the sample rate if it is audio, etc. Here you should get any header information, e.g. 2) to designate limited confidence that the file corresponds to your demuxer. If the format is mis-designed and doesn't have this, divide AVPROBE_SCORE_MAX by something (e.g. If there are 4 bytes and they are always the same, and unique, then return AVPROBE_SCORE_MAX. Most video containers start with some constant sequence of bytes. There should be no dependence on filename, in fact you probably can't even access it. The probe will be called by the framework this is where you can detect if the file is your format.
This section is merely an overview please look at an actual demuxer to see how to do it.
OBJS-$(CONFIG_DEMUXERNAME_DEMUXER) += filename.o Run configure in the top level directory and make clean, as config.h will be automatically modified.
The macro will add the _demuxer or whatever is appropriate. REGISTER_DEMUXER(DEMUXERNAME, demuxername) Registering the demuxer libavformat/allformats.c
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