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Sat Jan 13 21:55:06 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027353.html

Reimar D?ffinger wrote:
> Hello,
> attached patch uses macros to eliminate code duplication in MXF metadata
> read functions.
> 
> Greetings,
> Reimar D?ffinger
> 
> 
> ------------------------------------------------------------------------
> 
> Index: libavformat/mxf.c
> ===================================================================
> --- libavformat/mxf.c	(revision 7448)
> +++ libavformat/mxf.c	(working copy)
> @@ -359,26 +443,37 @@
>      return 0;
>  }
>  
> +#define MXF_READ_LOCAL_TAGS_START(typename, ctype, name) \
> +    ByteIOContext *pb = &mxf->fc->pb;\
> +    ctype *name = av_mallocz(sizeof(*name));\
> +    int bytes_read = 0;\
> +\
> +    while (bytes_read < klv->length) {\
> +        int tag = get_be16(pb);\
> +        int size = get_be16(pb); /* KLV specified by 0x53 */\
> +\
> +        dprintf("tag 0x%04X, size %d\n", tag, size);\
> +        if (!size) { /* ignore empty tag, needed for some files with empty UMID tag */\
> +            av_log(mxf->fc, AV_LOG_ERROR, "local tag 0x%04X with 0 size\n", tag);\
> +            continue;\
> +        }\

need to move bytes_read += size + 4 before continue besides that patch
looks ok.

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Showing content from https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027353.html below:

[Ffmpeg-devel] [PATCH] use macros to simplify MXF metadata read