[FFmpeg-devel] [PATCH] dshow: allow for more codecs take 2

Hendrik Leppkes h.leppkes at gmail.com
Thu Feb 14 12:30:42 CET 2013

On Thu, Feb 14, 2013 at 1:20 AM, Roger Pack <rogerdpack2 at gmail.com> wrote:
>>> still seems to not work correctly:
>>> <BBB-work> someone broke msvc dll builds by marking ff_codec_bmp_tags[]
>>> with av_export
>>> <BBB-work> can whoever did that fix it?
>>> <BBB-work> https://github.com/libav/c99-to-c89/issues/5
>>> [...]
>> This is also covered by a fate instance:
>> http://fate.ffmpeg.org/history.cgi?slot=x86_32-msvc10-dll-windows-native
>> Shared tables cannot be used as a constant initializer.
> so can anyone suggest something here?  I want to use ff_codec_bmp_tags
> shared, but apparently this is a special case where av_export won't
> work with it, because it is used elsewhere as a constant initializer?
> If there's no response I suppose I will just add a new (exported)
> method to riff.c that returns the table, and use that instead of raw
> access to the table...does that sound good?
> -roger-

It appears there already are functions for what you want:
- avformat_get_riff_video_tags gives you ff_codec_bmp_tags
- avformat_get_riff_audio_tags gives you ff_codec_wav_tags in case you
need this too

In general i think its a bad idea to export ff* functions and tables,
if something is needed rename it to avpriv* or for data tables a
getter function is a good idea, because sharing tables is always a bit
of a pain.

So, hide ff_codec_bmp_tags again (remove av_export and the .v file
entry), and usw the existing getter function. :)

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