libavcodec/idctdsp.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_IDCTDSP_H
  20 #define AVCODEC_IDCTDSP_H
  21
  22 #include <stddef.h>
  23 #include <stdint.h>
  24
  25 struct AVCodecContext;
  26
  27 enum idct_permutation_type {
  28     FF_IDCT_PERM_NONE,
  29     FF_IDCT_PERM_LIBMPEG2,
  30     FF_IDCT_PERM_SIMPLE,
  31     FF_IDCT_PERM_TRANSPOSE,
  32     FF_IDCT_PERM_PARTTRANS,
  33     FF_IDCT_PERM_SSE2,
  34 };
  35
  36 void ff_permute_scantable(uint8_t dst[64], const uint8_t src[64],
  37                           const uint8_t permutation[64]);
  38 void ff_init_scantable_permutation(uint8_t *idct_permutation,
  39                                    enum idct_permutation_type perm_type);
  40 int ff_init_scantable_permutation_x86(uint8_t *idct_permutation,
  41                                       enum idct_permutation_type perm_type);
  42
  43 typedef struct IDCTDSPContext {
  44     /* pixel ops : interface with DCT */
  45     void (*put_pixels_clamped)(const int16_t *block /* align 16 */,
  46                                uint8_t *restrict pixels /* align 8 */,
  47                                ptrdiff_t line_size);
  48     void (*put_signed_pixels_clamped)(const int16_t *block /* align 16 */,
  49                                       uint8_t *restrict pixels /* align 8 */,
  50                                       ptrdiff_t line_size);
  51     void (*add_pixels_clamped)(const int16_t *block /* align 16 */,
  52                                uint8_t *restrict pixels /* align 8 */,
  53                                ptrdiff_t line_size);
  54
  55     void (*idct)(int16_t *block /* align 16 */);
  56
  57     /**
  58      * block -> idct -> clip to unsigned 8 bit -> dest.
  59      * (-1392, 0, 0, ...) -> idct -> (-174, -174, ...) -> put -> (0, 0, ...)
  60      * @param line_size size in bytes of a horizontal line of dest
  61      */
  62     void (*idct_put)(uint8_t *dest /* align 8 */,
  63                      ptrdiff_t line_size, int16_t *block /* align 16 */);
  64
  65     /**
  66      * block -> idct -> add dest -> clip to unsigned 8 bit -> dest.
  67      * @param line_size size in bytes of a horizontal line of dest
  68      */
  69     void (*idct_add)(uint8_t *dest /* align 8 */,
  70                      ptrdiff_t line_size, int16_t *block /* align 16 */);
  71
  72     /**
  73      * IDCT input permutation.
  74      * Several optimized IDCTs need a permutated input (relative to the
  75      * normal order of the reference IDCT).
  76      * This permutation must be performed before the idct_put/add.
  77      * Note, normally this can be merged with the zigzag/alternate scan<br>
  78      * An example to avoid confusion:
  79      * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
  80      * - (x -> reference DCT -> reference IDCT -> x)
  81      * - (x -> reference DCT -> simple_mmx_perm = idct_permutation
  82      *    -> simple_idct_mmx -> x)
  83      * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
  84      *    -> simple_idct_mmx -> ...)
  85      */
  86     uint8_t idct_permutation[64];
  87     enum idct_permutation_type perm_type;
  88
  89     int mpeg4_studio_profile;
  90 } IDCTDSPContext;
  91
  92 void ff_put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
  93                              ptrdiff_t line_size);
  94 void ff_add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
  95                              ptrdiff_t line_size);
  96
  97 void ff_idctdsp_init(IDCTDSPContext *c, struct AVCodecContext *avctx);
  98
  99 void ff_idctdsp_init_aarch64(IDCTDSPContext *c, struct AVCodecContext *avctx,
 100                              unsigned high_bit_depth);
 101 void ff_idctdsp_init_alpha(IDCTDSPContext *c, struct AVCodecContext *avctx,
 102                            unsigned high_bit_depth);
 103 void ff_idctdsp_init_arm(IDCTDSPContext *c, struct AVCodecContext *avctx,
 104                          unsigned high_bit_depth);
 105 void ff_idctdsp_init_ppc(IDCTDSPContext *c, struct AVCodecContext *avctx,
 106                          unsigned high_bit_depth);
 107 void ff_idctdsp_init_riscv(IDCTDSPContext *c, struct AVCodecContext *avctx,
 108                            unsigned high_bit_depth);
 109 void ff_idctdsp_init_x86(IDCTDSPContext *c, struct AVCodecContext *avctx,
 110                          unsigned high_bit_depth);
 111 void ff_idctdsp_init_mips(IDCTDSPContext *c, struct AVCodecContext *avctx,
 112                           unsigned high_bit_depth);
 113 void ff_idctdsp_init_loongarch(IDCTDSPContext *c, struct AVCodecContext *avctx,
 114                                unsigned high_bit_depth);
 115
 116 #endif /* AVCODEC_IDCTDSP_H */