Review Request 129920: Replace Deprecated AV Functions

[Dominik Waurenschk]

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https://git.reviewboard.kde.org/r/129920/
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Review request for Amarok.


Repository: amarok


Description
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Replace all deprecated (and not found) functions with their new counterpart.  
  
At least `avcodec_alloc_frame()` and `avcodec_get_frame_defaults()` must be replaced with `av_frame_alloc()` and `av_frame_unref()` respectively as those cause the compile to crash otherwise.  
`av_free_packet()` should also be replaced with `av_packet_unref()`  
Replacing how pCodecCdx is obtained should also be fine.  
  
My only concerns are with replacing `avcodec_decode_audio4()` as this has become quite more complicated and I cannot currently test its functionality as getting tags from musicbrainz fails before it reaches this code. See [bug 328359](https://bugs.kde.org/show_bug.cgi?id=328359)


Diffs
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  src/musicbrainz/MusicDNSAudioDecoder.cpp ea39a1b4fc 

Diff: https://git.reviewboard.kde.org/r/129920/diff/


Testing
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Thanks,

Dominik Waurenschk

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