[FFmpeg-devel] [PATCH] move av_crc04C11DB7_update to libavutil

Baptiste Coudurier baptiste.coudurier
Sun Oct 28 22:11:05 CET 2007

Aurelien Jacobs wrote:
> Michael Niedermayer wrote:
>>On Sun, Oct 28, 2007 at 06:51:19PM +0100, Baptiste Coudurier wrote:
>>>$subject. Needed to avoid code duplication for new ogg muxer.
>>>Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
>>>SMARTJOG S.A.                                    http://www.smartjog.com
>>>Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
>>>Phone: +33 1 49966312
>>>Index: libavutil/crc.c
>>>--- libavutil/crc.c	(revision 10867)
>>>+++ libavutil/crc.c	(working copy)
>>>@@ -105,6 +105,10 @@
>>>     return crc;
>>> }
>>>+unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, unsigned int len){
>>>+    return av_crc(av_crc04C11DB7, checksum, buf, len);
>>> #ifdef TEST
>>> #undef printf
>>> main(){
>>libavutil is not supposed to be a place for code common between libavcodec
>>and libavformat, even less so between 2 libavformat (de)muxers! but rather
>>a small lib of generally usefull things av_crc04C11DB7_update() is not
>>usefull outside of libavformat
>>so this function should stay in libavformat 
> Indeed.
> And I naively thought it should be moved to libavformat/crc.[ch].
> But that's not possible right now. We currently can't have to .h
> files with the same name in different libav* lib.
> I wonder if this is intentional or if this should be fixed ?
> The problems are:
>  - usage of the FFMPEG_ prefix for multiple inclusion guards
>      solution: use the following prefix: AVUTIL_, AVFORMAT_...
>  - usage of -Ilibav* to set compiler include path
>      solution: only add ffmpeg root directory to compiler include
>      path, and explicitly specify directory when including files
>      which are not in the same directory
> I personally think it should be fixed, but if it's not, we should
> probably at least add a note somewhere explaining that multiple
> headers with the same name are forbidden.

Humm, so it ok to add it to aviobuf.c and avio.h for now ?

Baptiste COUDURIER                              GnuPG Key Id: 0x5C1ABAAA
SMARTJOG S.A.                                    http://www.smartjog.com
Key fingerprint                 8D77134D20CC9220201FC5DB0AC9325C5C1ABAAA
Phone: +33 1 49966312
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