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  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_AVDCT_H
  20. #define AVCODEC_AVDCT_H
  21.  
  22. #include "libavutil/opt.h"
  23.  
  24. /**
  25.  * AVDCT context.
  26.  * @note function pointers can be NULL if the specific features have been
  27.  *       disabled at build time.
  28.  */
  29. typedef struct AVDCT {
  30.     const AVClass *av_class;
  31.  
  32.     void (*idct)(int16_t *block /* align 16 */);
  33.  
  34.     /**
  35.      * IDCT input permutation.
  36.      * Several optimized IDCTs need a permutated input (relative to the
  37.      * normal order of the reference IDCT).
  38.      * This permutation must be performed before the idct_put/add.
  39.      * Note, normally this can be merged with the zigzag/alternate scan<br>
  40.      * An example to avoid confusion:
  41.      * - (->decode coeffs -> zigzag reorder -> dequant -> reference IDCT -> ...)
  42.      * - (x -> reference DCT -> reference IDCT -> x)
  43.      * - (x -> reference DCT -> simple_mmx_perm = idct_permutation
  44.      *    -> simple_idct_mmx -> x)
  45.      * - (-> decode coeffs -> zigzag reorder -> simple_mmx_perm -> dequant
  46.      *    -> simple_idct_mmx -> ...)
  47.      */
  48.     uint8_t idct_permutation[64];
  49.  
  50.     void (*fdct)(int16_t *block /* align 16 */);
  51.  
  52.  
  53.     /**
  54.      * DCT algorithm.
  55.      * must use AVOptions to set this field.
  56.      */
  57.     int dct_algo;
  58.  
  59.     /**
  60.      * IDCT algorithm.
  61.      * must use AVOptions to set this field.
  62.      */
  63.     int idct_algo;
  64.  
  65.     void (*get_pixels)(int16_t *block /* align 16 */,
  66.                        const uint8_t *pixels /* align 8 */,
  67.                        ptrdiff_t line_size);
  68.  
  69.     int bits_per_sample;
  70. } AVDCT;
  71.  
  72. /**
  73.  * Allocates a AVDCT context.
  74.  * This needs to be initialized with avcodec_dct_init() after optionally
  75.  * configuring it with AVOptions.
  76.  *
  77.  * To free it use av_free()
  78.  */
  79. AVDCT *avcodec_dct_alloc(void);
  80. int avcodec_dct_init(AVDCT *);
  81.  
  82. const AVClass *avcodec_dct_get_class(void);
  83.  
  84. #endif /* AVCODEC_AVDCT_H */
  85.