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Sun Jan 14 05:41:02 CET 2007 · https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027356.html

Hi

On Sat, Jan 13, 2007 at 09:39:43PM +0100, Reimar D?ffinger wrote:
> Hello,
> attached patch uses macros to eliminate code duplication in MXF metadata
> read functions.

it eliminates the duplication at source code level but not at object level

may i rather suggest:

typedef struct MXFChunk {
    UID uid;
    enum MXFMetadataSetType type;
}

static int mxf_read_local_tag(MXFContext *mxf, KLVPacket *klv, int ctx_size, read_child, MXFMetadataSetType type){
    ByteIOContext *pb = &mxf->fc->pb;
    MXFChunk *ctx = av_mallocz(ctx_size);
    uint64_t klv_end= url_ftell(pb) + klv->length;

    while (url_ftell(pb) + 4 < klv_end) {
        int tag = get_be16(pb);
        int size = get_be16(pb); /* KLV specified by 0x53 */
        uint64_t next= url_ftell(pb) + 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;
        }
        if(tag == 0x3C0A)
            get_buffer(pb, ctx->uid, 16);
        else
            read_child(ctx, pb, tag);

        url_fseek(pb, next, SEEK_SET);
    }
    ctx->type = type;
    return mxf_add_metadata_set(mxf, ctx);
}

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato
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Showing content from https://ffmpeg.org/pipermail/ffmpeg-devel/2007-January/027356.html below:

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