Function vaapi_encode_init_row_slice_structure

libavcodec/vaapi_encode.c:1717–1760

}

static av_cold int vaapi_encode_init_row_slice_structure(AVCodecContext *avctx,
                                                         uint32_t slice_structure)
{
    VAAPIEncodeContext *ctx = avctx->priv_data;
    int req_slices;

    // For fixed-size slices currently we only support whole rows, making
    // rectangular slices.  This could be extended to arbitrary runs of
    // blocks, but since slices tend to be a conformance requirement and
    // most cases (such as broadcast or bluray) want rectangular slices
    // only it would need to be gated behind another option.
    if (avctx->slices > ctx->slice_block_rows) {
        av_log(avctx, AV_LOG_WARNING, "Not enough rows to use "
               "configured number of slices (%d < %d); using "
               "maximum.\n", ctx->slice_block_rows, avctx->slices);
        req_slices = ctx->slice_block_rows;
    } else {
        req_slices = avctx->slices;
    }
    if (slice_structure & VA_ENC_SLICE_STRUCTURE_ARBITRARY_ROWS ||
        slice_structure & VA_ENC_SLICE_STRUCTURE_ARBITRARY_MACROBLOCKS) {
        ctx->nb_slices  = req_slices;
        ctx->slice_size = ctx->slice_block_rows / ctx->nb_slices;
    } else if (slice_structure & VA_ENC_SLICE_STRUCTURE_POWER_OF_TWO_ROWS) {
        int k;
        for (k = 1;; k *= 2) {
            if (2 * k * (req_slices - 1) + 1 >= ctx->slice_block_rows)
                break;
        }
        ctx->nb_slices  = (ctx->slice_block_rows + k - 1) / k;
        ctx->slice_size = k;
#if VA_CHECK_VERSION(1, 0, 0)
    } else if (slice_structure & VA_ENC_SLICE_STRUCTURE_EQUAL_ROWS) {
        ctx->nb_slices  = ctx->slice_block_rows;
        ctx->slice_size = 1;
#endif
    } else {
        av_log(avctx, AV_LOG_ERROR, "Driver does not support any usable "
               "slice structure modes (%#x).\n", slice_structure);
        return AVERROR(EINVAL);
    }

    return 0;
}

static av_cold int vaapi_encode_init_tile_slice_structure(AVCodecContext *avctx,
                                                          uint32_t slice_structure)