[MPlayer-dev-eng] [PATCH] Movie fragments support for demux_mov

[David Romacho]

Hi all,

The goal of these patches is to provide MPlayer with the movie fragment 
feature present in mov/mp4 container (ISO/IEC 14496-12 standard). This 
feature is used by some digital cameras that save the video in several 
fragments. Currently MPlayer just recognises the first movie fragment 
and does not play the rest of fragments.

I split the previous patch into 3 different patches. They are supposed 
to be applied one right after the other against demux_mov.c
MPlayer should compile after applying each patch but support for movie 
fragments won't be fully operational till last patch is applied.
So, once all patches are applied, MPlayer should playback the movie 
fragment test samples (http://samples.mplayerhq.hu/mov/fragments/) 
completely. The head of MPlayer just plays the first 15 seconds of them 
(the first movie fragment).

Patch description:

step1.patch

This patch basically adds :

    * Adds the mov_traf_t struct.
    * Adds new members to mov_priv_t.
    * Does not stop parsing when a 'mdat' atom is found. Inserts it into 
the list and continues.
    * Recognises 'mfra' atoms in 'mov_check_file' function.
    * Recognises 'moov' atoms in 'mov_check_file' function.

step2.patch

This patch adds new functions that parse previously ignored atoms:

    * lschunks_inmfra: parses 'mfra' atoms. Movie Fragment Random Access 
Box (for fast seeking). Has 'tfra' and 'mfro' atoms inside.
    * lschunks_intraf: parses 'traf' atoms. Track Fragment Box. Has 
'tfhd' and 'trun' atoms inside.
    * lschunks_inmoof: parses 'moof' atoms. Movie Fragment Box. Has 
'mfhd' and 'traf' atoms inside.
    * lschunks_inmvex: parses 'mvex' atoms. Movie Extends Box. Has 
'mehd' and 'trex' atoms inside.

If someone reviews this patch, he will need to take a look to the 
ISO/IEC 14496-12 Standard documentation.
And a couple of new functions that are needed in order to add the traf 
to each track and finally rebuild indexes.

    * add_traf_to_track.
    * mov_rebuild_index.

step3.patch

    * Free allocated memory.
    * Fix the duration map.
    * Detect 'mvex' atoms in lschunks function.
    * Process 'moof' chunks, attach corresponding trafs and rebuild 
indexes in mov_read_header function.


I am also including movie_fragments.patch which includes all the 
changes. It can can be applied directly to demux_mov.c.

Cheers,

  David

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