static int decode_slice_chroma(AVCodecContext *avctx, SliceContext *slice,
                               uint16_t *dst, int dst_stride,
                               const uint8_t *buf, unsigned buf_size,
                               const int16_t *qmat, int log2_blocks_per_mb)
{
    ProresContext *ctx = avctx->priv_data;
    LOCAL_ALIGNED_16(int16_t, blocks, [8*4*64]);
    int16_t *block;
    GetBitContext gb;
    int i, j, blocks_per_slice = slice->mb_count << log2_blocks_per_mb;
    int ret;

    for (i = 0; i < blocks_per_slice; i++)
        ctx->bdsp.clear_block(blocks+(i<<6));

    init_get_bits(&gb, buf, buf_size << 3);

    if ((ret = decode_dc_coeffs(&gb, blocks, blocks_per_slice)) < 0)
        return ret;
    if ((ret = decode_ac_coeffs(avctx, &gb, blocks, blocks_per_slice)) < 0)
        return ret;

    block = blocks;
    for (i = 0; i < slice->mb_count; i++) {
        for (j = 0; j < log2_blocks_per_mb; j++) {
            ctx->prodsp.idct_put(dst,              dst_stride, block+(0<<6), qmat);
            ctx->prodsp.idct_put(dst+4*dst_stride, dst_stride, block+(1<<6), qmat);
            block += 2*64;
            dst += 8;
        }
    }
    return 0;
}