API out of imgconvert.c into avcodec.h.

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Patch by Benoit Fouet % benoit P fouet A purplelabs P com %

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libavcodec/avcodec.h.

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AVERROR_ defines are moved to avcodec.h as they are needed in there as well. Feel free to move that to avutil/common.h.
Bumped up avcodec/format version numbers as though it's binary compatible we will want to rebuild apps as error values changed.
Please from now on use return AVERROR(EFOO) instead of the ugly return -EFOO in your code.
This also removes the need for berrno.h.

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Revised patch for HD DVD .EVO demuxing by (Ian Caulfield <lowercase name seperated by . place at here gmail place a dot here com>)

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courtesy of Paul Richards, paul.richards gmail com

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difference to avcodec_decode_audio() is that the user can pass the allocated size of the output buffer to the decoder and the decoder can check if theres enough space

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comment in the code.

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