Function exif_attach_ifd

libavcodec/decode.c:2397–2450

}

static int exif_attach_ifd(AVCodecContext *avctx, AVFrame *frame, const AVExifMetadata *ifd, AVBufferRef **pbuf)
{
    const AVExifEntry *orient = NULL;
    AVExifMetadata *cloned = NULL;
    int ret;

    for (size_t i = 0; i < ifd->count; i++) {
        const AVExifEntry *entry = &ifd->entries[i];
        if (entry->id == av_exif_get_tag_id("Orientation") &&
            entry->count > 0 && entry->type == AV_TIFF_SHORT) {
            orient = entry;
            break;
        }
    }

    if (orient) {
        av_log(avctx, AV_LOG_DEBUG, "found EXIF orientation: %" PRIu64 "\n", orient->value.uint[0]);
        ret = attach_displaymatrix(avctx, frame, orient->value.uint[0]);
        if (ret < 0) {
            av_log(avctx, AV_LOG_WARNING, "unable to attach displaymatrix from EXIF\n");
        } else {
            cloned = av_exif_clone_ifd(ifd);
            if (!cloned) {
                ret = AVERROR(ENOMEM);
                goto end;
            }
            av_exif_remove_entry(avctx, cloned, orient->id, 0);
            ifd = cloned;
        }
    }

    ret = av_exif_ifd_to_dict(avctx, ifd, &frame->metadata);
    if (ret < 0)
        goto end;

    if (cloned || !*pbuf) {
        av_buffer_unref(pbuf);
        ret = av_exif_write(avctx, ifd, pbuf, AV_EXIF_TIFF_HEADER);
        if (ret < 0)
            goto end;
    }

    ret = ff_frame_new_side_data_from_buf(avctx, frame, AV_FRAME_DATA_EXIF, pbuf);
    if (ret < 0)
        goto end;

    ret = 0;

end:
    av_buffer_unref(pbuf);
    av_exif_free(cloned);
    av_free(cloned);
    return ret;
}

int ff_decode_exif_attach_ifd(AVCodecContext *avctx, AVFrame *frame, const AVExifMetadata *ifd)
{