/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** * block -> idct -> clip to unsigned 8 bit -> dest. * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...) * @param line_size size in bytes of a horizontal line of dest
*/ void (*idct_put)(uint8_t *dest /* align 8 */,
ptrdiff_t line_size, int16_t *block /* align 16 */);
/** * block -> idct -> add dest -> clip to unsigned 8 bit -> dest. * @param line_size size in bytes of a horizontal line of dest
*/ void (*idct_add)(uint8_t *dest /* align 8 */,
ptrdiff_t line_size, int16_t *block /* align 16 */);
/** * IDCT input permutation. * Several optimized IDCTs need a permutated input (relative to the * normal order of the reference IDCT). * This permutation must be performed before the idct_put/add. * Note, normally this can be merged with the zigzag/alternate scan<br> * An example to avoid confusion: * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...) * - (x -> reference DCT -> reference IDCT -> x) * - (x -> reference DCT -> simple_mmx_perm = idct_permutation * -> simple_idct_mmx -> x) * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant * -> simple_idct_mmx -> ...)
*/
uint8_t idct_permutation[64]; enum idct_permutation_type perm_type;
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