Function side_data_exif_parse

libavcodec/decode.c:1401–1471

}

static int side_data_exif_parse(AVFrame *dst, const AVPacketSideData *sd_pkt)
{
    AVExifMetadata ifd = { 0 };
    AVExifEntry *entry = NULL;
    AVBufferRef *buf = NULL;
    AVFrameSideData *sd_frame;
    int ret;

    ret = av_exif_parse_buffer(NULL, sd_pkt->data, sd_pkt->size, &ifd,
                               AV_EXIF_TIFF_HEADER);
    if (ret < 0)
        return ret;

    ret = av_exif_get_entry(NULL, &ifd, av_exif_get_tag_id("Orientation"), 0, &entry);
    if (ret < 0)
        goto end;

    if (!entry) {
        ret = av_exif_ifd_to_dict(NULL, &ifd, &dst->metadata);
        if (ret < 0)
            goto end;

        sd_frame = av_frame_side_data_new(&dst->side_data, &dst->nb_side_data, AV_FRAME_DATA_EXIF,
                                          sd_pkt->size, 0);
        if (sd_frame)
            memcpy(sd_frame->data, sd_pkt->data, sd_pkt->size);
        ret = sd_frame ? 0 : AVERROR(ENOMEM);

        goto end;
    } else if (entry->count <= 0 || entry->type != AV_TIFF_SHORT) {
        ret = AVERROR_INVALIDDATA;
        goto end;
    }

    // If a display matrix already exists in the frame, give it priority
    if (av_frame_side_data_get(dst->side_data, dst->nb_side_data, AV_FRAME_DATA_DISPLAYMATRIX))
        goto finish;

    sd_frame = av_frame_side_data_new(&dst->side_data, &dst->nb_side_data, AV_FRAME_DATA_DISPLAYMATRIX,
                                      sizeof(int32_t) * 9, 0);
    if (!sd_frame) {
        ret = AVERROR(ENOMEM);
        goto end;
    }

    ret = av_exif_orientation_to_matrix((int32_t *)sd_frame->data, entry->value.uint[0]);
    if (ret < 0)
        goto end;

finish:
    av_exif_remove_entry(NULL, &ifd, entry->id, 0);

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

    ret = av_exif_write(NULL, &ifd, &buf, AV_EXIF_TIFF_HEADER);
    if (ret < 0)