text: /*
   * DSP utils
   * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
   *
   * 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
   */
  
  /**
   * @file libavcodec/dsputil.h
   * DSP utils.
   * note, many functions in here may use MMX which trashes the FPU state, it is
   * absolutely necessary to call emms_c() between dsp & float/double code
   */
  
  #ifndef AVCODEC_DSPUTIL_H
  #define AVCODEC_DSPUTIL_H
  
  #include "libavutil/intreadwrite.h"
  #include "avcodec.h"
  
  
  //#define DEBUG
  /* dct code */
  typedef short DCTELEM;
  
  void fdct_ifast (DCTELEM *data);
  void fdct_ifast248 (DCTELEM *data);
  void ff_jpeg_fdct_islow (DCTELEM *data);
  void ff_fdct248_islow (DCTELEM *data);
  
  void j_rev_dct (DCTELEM *data);
  void j_rev_dct4 (DCTELEM *data);
  void j_rev_dct2 (DCTELEM *data);
  void j_rev_dct1 (DCTELEM *data);
  void ff_wmv2_idct_c(DCTELEM *data);
  
  void ff_fdct_mmx(DCTELEM *block);
  void ff_fdct_mmx2(DCTELEM *block);
  void ff_fdct_sse2(DCTELEM *block);
  
  void ff_h264_idct8_add_c(uint8_t *dst, DCTELEM *block, int stride);
  void ff_h264_idct_add_c(uint8_t *dst, DCTELEM *block, int stride);
  void ff_h264_idct8_dc_add_c(uint8_t *dst, DCTELEM *block, int stride);
  void ff_h264_idct_dc_add_c(uint8_t *dst, DCTELEM *block, int stride);
  void ff_h264_lowres_idct_add_c(uint8_t *dst, int stride, DCTELEM *block);
  void ff_h264_lowres_idct_put_c(uint8_t *dst, int stride, DCTELEM *block);
  void ff_h264_idct_add16_c(uint8_t *dst, const int *blockoffset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]);
  void ff_h264_idct_add16intra_c(uint8_t *dst, const int *blockoffset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]);
  void ff_h264_idct8_add4_c(uint8_t *dst, const int *blockoffset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]);
  void ff_h264_idct_add8_c(uint8_t **dest, const int *blockoffset, DCTELEM *block, int stride, const uint8_t nnzc[6*8]);
  
  void ff_vector_fmul_window_c(float *dst, const float *src0, const float *src1,
                               const float *win, float add_bias, int len);
  void ff_float_to_int16_c(int16_t *dst, const float *src, long len);
  void ff_float_to_int16_interleave_c(int16_t *dst, const float **src, long len, int channels);
  
  /* encoding scans */
  extern const uint8_t ff_alternate_horizontal_scan[64];
  extern const uint8_t ff_alternate_vertical_scan[64];
  extern const uint8_t ff_zigzag_direct[64];
  extern const uint8_t ff_zigzag248_direct[64];
  
  /* pixel operations */
  #define MAX_NEG_CROP 1024
  
  /* temporary */
  extern uint32_t ff_squareTbl[512];
  extern uint8_t ff_cropTbl[256 + 2 * MAX_NEG_CROP];
  
  /* VP3 DSP functions */
  void ff_vp3_idct_c(DCTELEM *block/* align 16*/);
  void ff_vp3_idct_put_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
  void ff_vp3_idct_add_c(uint8_t *dest/*align 8*/, int line_size, DCTELEM *block/*align 16*/);
  
  void ff_vp3_v_loop_filter_c(uint8_t *src, int stride, int *bounding_values);
  void ff_vp3_h_loop_filter_c(uint8_t *src, int stride, int *bounding_values);
  
  /* VP6 DSP functions */
  void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
                             const int16_t *h_weights, const int16_t *v_weights);
  
  /* Bink functions */
  void ff_bink_idct_c    (DCTELEM *block);
  void ff_bink_idct_add_c(uint8_t *dest, int linesize, DCTELEM *block);
  void ff_bink_idct_put_c(uint8_t *dest, int linesize, DCTELEM *block);
  
  /* CAVS functions */
  void ff_put_cavs_qpel8_mc00_c(uint8_t *dst, uint8_t *src, int stride);
  void ff_avg_cavs_qpel8_mc00_c(uint8_t *dst, uint8_t *src, int stride);
  void ff_put_cavs_qpel16_mc00_c(uint8_t *dst, uint8_t *src, int stride);
  void ff_avg_cavs_qpel16_mc00_c(uint8_t *dst, uint8_t *src, int stride);
  
  /* VC1 functions */
  void ff_put_vc1_mspel_mc00_c(uint8_t *dst, const uint8_t *src, int stride, int rnd);
  void ff_avg_vc1_mspel_mc00_c(uint8_t *dst, const uint8_t *src, int stride, int rnd);
  
  /* EA functions */
  void ff_ea_idct_put_c(uint8_t *dest, int linesize, DCTELEM *block);
  
  /* 1/2^n downscaling functions from imgconvert.c */
  void ff_img_copy_plane(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
  void ff_shrink22(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
  void ff_shrink44(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
  void ff_shrink88(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
  
  void ff_gmc_c(uint8_t *dst, uint8_t *src, int stride, int h, int ox, int oy,
                int dxx, int dxy, int dyx, int dyy, int shift, int r, int width, int height);
  
  /* minimum alignment rules ;)
  If you notice errors in the align stuff, need more alignment for some ASM code
  for some CPU or need to use a function with less aligned data then send a mail
  to the ffmpeg-devel mailing list, ...
  
  !warning These alignments might not match reality, (missing attribute((align))
  stuff somewhere possible).
  I (Michael) did not check them, these are just the alignments which I think
  could be reached easily ...
  
  !future video codecs might need functions with less strict alignment
  */
  
  /*
  void get_pixels_c(DCTELEM *block, const uint8_t *pixels, int line_size);
  void diff_pixels_c(DCTELEM *block, const uint8_t *s1, const uint8_t *s2, int stride);
  void put_pixels_clamped_c(const DCTELEM *block, uint8_t *pixels, int line_size);
  void add_pixels_clamped_c(const DCTELEM *block, uint8_t *pixels, int line_size);
  void clear_blocks_c(DCTELEM *blocks);
  */
  
  /* add and put pixel (decoding) */
  // blocksizes for op_pixels_func are 8x4,8x8 16x8 16x16
  //h for op_pixels_func is limited to {width/2, width} but never larger than 16 and never smaller then 4
  typedef void (*op_pixels_func)(uint8_t *block/*align width (8 or 16)*/, const uint8_t *pixels/*align 1*/, int line_size, int h);
  typedef void (*tpel_mc_func)(uint8_t *block/*align width (8 or 16)*/, const uint8_t *pixels/*align 1*/, int line_size, int w, int h);
  typedef void (*qpel_mc_func)(uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);
  typedef void (*h264_chroma_mc_func)(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int srcStride, int h, int x, int y);
  
  typedef void (*op_fill_func)(uint8_t *block/*align width (8 or 16)*/, uint8_t value, int line_size, int h);
  
  #define DEF_OLD_QPEL(name)\
  void ff_put_        ## name (uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);\
  void ff_put_no_rnd_ ## name (uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);\
  void ff_avg_        ## name (uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);
  
  DEF_OLD_QPEL(qpel16_mc11_old_c)
  DEF_OLD_QPEL(qpel16_mc31_old_c)
  DEF_OLD_QPEL(qpel16_mc12_old_c)
  DEF_OLD_QPEL(qpel16_mc32_old_c)
  DEF_OLD_QPEL(qpel16_mc13_old_c)
  DEF_OLD_QPEL(qpel16_mc33_old_c)
  DEF_OLD_QPEL(qpel8_mc11_old_c)
  DEF_OLD_QPEL(qpel8_mc31_old_c)
  DEF_OLD_QPEL(qpel8_mc12_old_c)
  DEF_OLD_QPEL(qpel8_mc32_old_c)
  DEF_OLD_QPEL(qpel8_mc13_old_c)
  DEF_OLD_QPEL(qpel8_mc33_old_c)
  
  #define CALL_2X_PIXELS(a, b, n)\
  static void a(uint8_t *block, const uint8_t *pixels, int line_size, int h){\
      b(block  , pixels  , line_size, h);\
      b(block+n, pixels+n, line_size, h);\
  }
  
  /* motion estimation */
  // h is limited to {width/2, width, 2*width} but never larger than 16 and never smaller then 2
  // although currently h<4 is not used as functions with width <8 are neither used nor implemented
  typedef int (*me_cmp_func)(void /*MpegEncContext*/ *s, uint8_t *blk1/*align width (8 or 16)*/, uint8_t *blk2/*align 1*/, int line_size, int h)/* __attribute__ ((const))*/;
  
  /**
   * Scantable.
   */
  typedef struct ScanTable{
      const uint8_t *scantable;
      uint8_t permutated[64];
      uint8_t raster_end[64];
  #if ARCH_PPC
                  /** Used by dct_quantize_altivec to find last-non-zero */
      DECLARE_ALIGNED(16, uint8_t, inverse)[64];
  #endif
  } ScanTable;
  
  void ff_init_scantable(uint8_t *, ScanTable *st, const uint8_t *src_scantable);
  
  void ff_emulated_edge_mc(uint8_t *buf, uint8_t *src, int linesize,
                           int block_w, int block_h,
                           int src_x, int src_y, int w, int h);
  
  /**
   * DSPContext.
   */
  typedef struct DSPContext {
      /* pixel ops : interface with DCT */
      void (*get_pixels)(DCTELEM *block/*align 16*/, const uint8_t *pixels/*align 8*/, int line_size);
      void (*diff_pixels)(DCTELEM *block/*align 16*/, const uint8_t *s1/*align 8*/, const uint8_t *s2/*align 8*/, int stride);
      void (*put_pixels_clamped)(const DCTELEM *block/*align 16*/, uint8_t *pixels/*align 8*/, int line_size);
      void (*put_signed_pixels_clamped)(const DCTELEM *block/*align 16*/, uint8_t *pixels/*align 8*/, int line_size);
      void (*put_pixels_nonclamped)(const DCTELEM *block/*align 16*/, uint8_t *pixels/*align 8*/, int line_size);
      void (*add_pixels_clamped)(const DCTELEM *block/*align 16*/, uint8_t *pixels/*align 8*/, int line_size);
      void (*add_pixels8)(uint8_t *pixels, DCTELEM *block, int line_size);
      void (*add_pixels4)(uint8_t *pixels, DCTELEM *block, int line_size);
      int (*sum_abs_dctelem)(DCTELEM *block/*align 16*/);
      /**
       * translational global motion compensation.
       */
      void (*gmc1)(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int srcStride, int h, int x16, int y16, int rounder);
      /**
       * global motion compensation.
       */
      void (*gmc )(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int stride, int h, int ox, int oy,
                      int dxx, int dxy, int dyx, int dyy, int shift, int r, int width, int height);
      void (*clear_block)(DCTELEM *block/*align 16*/);
      void (*clear_blocks)(DCTELEM *blocks/*align 16*/);
      int (*pix_sum)(uint8_t * pix, int line_size);
      int (*pix_norm1)(uint8_t * pix, int line_size);
  // 16x16 8x8 4x4 2x2 16x8 8x4 4x2 8x16 4x8 2x4
  
      me_cmp_func sad[6]; /* identical to pix_absAxA except additional void * */
      me_cmp_func sse[6];
      me_cmp_func hadamard8_diff[6];
      me_cmp_func dct_sad[6];
      me_cmp_func quant_psnr[6];
      me_cmp_func bit[6];
      me_cmp_func rd[6];
      me_cmp_func vsad[6];
      me_cmp_func vsse[6];
      me_cmp_func nsse[6];
      me_cmp_func w53[6];
      me_cmp_func w97[6];
      me_cmp_func dct_max[6];
      me_cmp_func dct264_sad[6];
  
      me_cmp_func me_pre_cmp[6];
      me_cmp_func me_cmp[6];
      me_cmp_func me_sub_cmp[6];
      me_cmp_func mb_cmp[6];
      me_cmp_func ildct_cmp[6]; //only width 16 used
      me_cmp_func frame_skip_cmp[6]; //only width 8 used
  
      int (*ssd_int8_vs_int16)(const int8_t *pix1, const int16_t *pix2,
                               int size);
  
      /**
       * Halfpel motion compensation with rounding (a+b+1)>>1.
       * this is an array[4][4] of motion compensation functions for 4
       * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
       * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
       * @param block destination where the result is stored
       * @param pixels source
       * @param line_size number of bytes in a horizontal line of block
       * @param h height
       */
      op_pixels_func put_pixels_tab[4][4];
  
      /**
       * Halfpel motion compensation with rounding (a+b+1)>>1.
       * This is an array[4][4] of motion compensation functions for 4
       * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
       * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
       * @param block destination into which the result is averaged (a+b+1)>>1
       * @param pixels source
       * @param line_size number of bytes in a horizontal line of block
       * @param h height
       */
      op_pixels_func avg_pixels_tab[4][4];
  
      /**
       * Halfpel motion compensation with no rounding (a+b)>>1.
       * this is an array[2][4] of motion compensation functions for 2
       * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
       * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
       * @param block destination where the result is stored
       * @param pixels source
       * @param line_size number of bytes in a horizontal line of block
       * @param h height
       */
      op_pixels_func put_no_rnd_pixels_tab[4][4];
  
      /**
       * Halfpel motion compensation with no rounding (a+b)>>1.
       * this is an array[2][4] of motion compensation functions for 2
       * horizontal blocksizes (8,16) and the 4 halfpel positions<br>
       * *pixels_tab[ 0->16xH 1->8xH ][ xhalfpel + 2*yhalfpel ]
       * @param block destination into which the result is averaged (a+b)>>1
       * @param pixels source
       * @param line_size number of bytes in a horizontal line of block
       * @param h height
       */
      op_pixels_func avg_no_rnd_pixels_tab[4][4];
  
      void (*put_no_rnd_pixels_l2[2])(uint8_t *block/*align width (8 or 16)*/, const uint8_t *a/*align 1*/, const uint8_t *b/*align 1*/, int line_size, int h);
  
      /**
       * Thirdpel motion compensation with rounding (a+b+1)>>1.
       * this is an array[12] of motion compensation functions for the 9 thirdpe
       * positions<br>
       * *pixels_tab[ xthirdpel + 4*ythirdpel ]
       * @param block destination where the result is stored
       * @param pixels source
       * @param line_size number of bytes in a horizontal line of block
       * @param h height
       */
      tpel_mc_func put_tpel_pixels_tab[11]; //FIXME individual func ptr per width?
      tpel_mc_func avg_tpel_pixels_tab[11]; //FIXME individual func ptr per width?
  
      qpel_mc_func put_qpel_pixels_tab[2][16];
      qpel_mc_func avg_qpel_pixels_tab[2][16];
      qpel_mc_func put_no_rnd_qpel_pixels_tab[2][16];
      qpel_mc_func avg_no_rnd_qpel_pixels_tab[2][16];
      qpel_mc_func put_mspel_pixels_tab[8];
  
      /**
       * h264 Chroma MC
       */
      h264_chroma_mc_func put_h264_chroma_pixels_tab[3];
      h264_chroma_mc_func avg_h264_chroma_pixels_tab[3];
      /* This is really one func used in VC-1 decoding */
      h264_chroma_mc_func put_no_rnd_vc1_chroma_pixels_tab[3];
      h264_chroma_mc_func avg_no_rnd_vc1_chroma_pixels_tab[3];
  
      qpel_mc_func put_h264_qpel_pixels_tab[4][16];
      qpel_mc_func avg_h264_qpel_pixels_tab[4][16];
  
      qpel_mc_func put_2tap_qpel_pixels_tab[4][16];
      qpel_mc_func avg_2tap_qpel_pixels_tab[4][16];
  
      /* AVS specific */
      qpel_mc_func put_cavs_qpel_pixels_tab[2][16];
      qpel_mc_func avg_cavs_qpel_pixels_tab[2][16];
      void (*cavs_filter_lv)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
      void (*cavs_filter_lh)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
      void (*cavs_filter_cv)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
      void (*cavs_filter_ch)(uint8_t *pix, int stride, int alpha, int beta, int tc, int bs1, int bs2);
      void (*cavs_idct8_add)(uint8_t *dst, DCTELEM *block, int stride);
  
      me_cmp_func pix_abs[2][4];
  
      /* huffyuv specific */
      void (*add_bytes)(uint8_t *dst/*align 16*/, uint8_t *src/*align 16*/, int w);
      void (*add_bytes_l2)(uint8_t *dst/*align 16*/, uint8_t *src1/*align 16*/, uint8_t *src2/*align 16*/, int w);
      void (*diff_bytes)(uint8_t *dst/*align 16*/, uint8_t *src1/*align 16*/, uint8_t *src2/*align 1*/,int w);
      /**
       * subtract huffyuv's variant of median prediction
       * note, this might read from src1[-1], src2[-1]
       */
      void (*sub_hfyu_median_prediction)(uint8_t *dst, const uint8_t *src1, const uint8_t *src2, int w, int *left, int *left_top);
      void (*add_hfyu_median_prediction)(uint8_t *dst, const uint8_t *top, const uint8_t *diff, int w, int *left, int *left_top);
      int  (*add_hfyu_left_prediction)(uint8_t *dst, const uint8_t *src, int w, int left);
      void (*add_hfyu_left_prediction_bgr32)(uint8_t *dst, const uint8_t *src, int w, int *red, int *green, int *blue, int *alpha);
      /* this might write to dst[w] */
      void (*add_png_paeth_prediction)(uint8_t *dst, uint8_t *src, uint8_t *top, int w, int bpp);
      void (*bswap_buf)(uint32_t *dst, const uint32_t *src, int w);
  
      void (*h263_v_loop_filter)(uint8_t *src, int stride, int qscale);
      void (*h263_h_loop_filter)(uint8_t *src, int stride, int qscale);
  
      void (*h261_loop_filter)(uint8_t *src, int stride);
  
      void (*x8_v_loop_filter)(uint8_t *src, int stride, int qscale);
      void (*x8_h_loop_filter)(uint8_t *src, int stride, int qscale);
  
      void (*vp3_v_loop_filter)(uint8_t *src, int stride, int *bounding_values);
      void (*vp3_h_loop_filter)(uint8_t *src, int stride, int *bounding_values);
  
      void (*vp6_filter_diag4)(uint8_t *dst, uint8_t *src, int stride,
                               const int16_t *h_weights,const int16_t *v_weights);
  
      /* assume len is a multiple of 4, and arrays are 16-byte aligned */
      void (*vorbis_inverse_coupling)(float *mag, float *ang, int blocksize);
      void (*ac3_downmix)(float (*samples)[256], float (*matrix)[2], int out_ch, int in_ch, int len);
      /* no alignment needed */
      void (*lpc_compute_autocorr)(const int32_t *data, int len, int lag, double *autoc);
      /* assume len is a multiple of 8, and arrays are 16-byte aligned */
      void (*vector_fmul)(float *dst, const float *src, int len);
      void (*vector_fmul_reverse)(float *dst, const float *src0, const float *src1, int len);
      /* assume len is a multiple of 8, and src arrays are 16-byte aligned */
      void (*vector_fmul_add)(float *dst, const float *src0, const float *src1, const float *src2, int len);
      /* assume len is a multiple of 4, and arrays are 16-byte aligned */
      void (*vector_fmul_window)(float *dst, const float *src0, const float *src1, const float *win, float add_bias, int len);
      /* assume len is a multiple of 8, and arrays are 16-byte aligned */
      void (*int32_to_float_fmul_scalar)(float *dst, const int *src, float mul, int len);
      void (*vector_clipf)(float *dst /* align 16 */, const float *src /* align 16 */, float min, float max, int len /* align 16 */);
      /**
       * Multiply a vector of floats by a scalar float.  Source and
       * destination vectors must overlap exactly or not at all.
       * @param dst result vector, 16-byte aligned
       * @param src input vector, 16-byte aligned
       * @param mul scalar value
       * @param len length of vector, multiple of 4
       */
      void (*vector_fmul_scalar)(float *dst, const float *src, float mul,
                                 int len);
      /**
       * Multiply a vector of floats by concatenated short vectors of
       * floats and by a scalar float.  Source and destination vectors
       * must overlap exactly or not at all.
       * [0]: short vectors of length 2, 8-byte aligned
       * [1]: short vectors of length 4, 16-byte aligned
       * @param dst output vector, 16-byte aligned
       * @param src input vector, 16-byte aligned
       * @param sv  array of pointers to short vectors
       * @param mul scalar value
       * @param len number of elements in src and dst, multiple of 4
       */
      void (*vector_fmul_sv_scalar[2])(float *dst, const float *src,
                                       const float **sv, float mul, int len);
      /**
       * Multiply short vectors of floats by a scalar float, store
       * concatenated result.
       * [0]: short vectors of length 2, 8-byte aligned
       * [1]: short vectors of length 4, 16-byte aligned
       * @param dst output vector, 16-byte aligned
       * @param sv  array of pointers to short vectors
       * @param mul scalar value
       * @param len number of output elements, multiple of 4
       */
      void (*sv_fmul_scalar[2])(float *dst, const float **sv,
                                float mul, int len);
      /**
       * Calculate the scalar product of two vectors of floats.
       * @param v1  first vector, 16-byte aligned
       * @param v2  second vector, 16-byte aligned
       * @param len length of vectors, multiple of 4
       */
      float (*scalarproduct_float)(const float *v1, const float *v2, int len);
      /**
       * Calculate the sum and difference of two vectors of floats.
       * @param v1  first input vector, sum output, 16-byte aligned
       * @param v2  second input vector, difference output, 16-byte aligned
       * @param len length of vectors, multiple of 4
       */
      void (*butterflies_float)(float *restrict v1, float *restrict v2, int len);
  
      /* C version: convert floats from the range [384.0,386.0] to ints in [-32768,32767]
       * simd versions: convert floats from [-32768.0,32767.0] without rescaling and arrays are 16byte aligned */
      void (*float_to_int16)(int16_t *dst, const float *src, long len);
      void (*float_to_int16_interleave)(int16_t *dst, const float **src, long len, int channels);
  
      /* (I)DCT */
      void (*fdct)(DCTELEM *block/* align 16*/);
      void (*fdct248)(DCTELEM *block/* align 16*/);
  
      /* IDCT really*/
      void (*idct)(DCTELEM *block/* align 16*/);
  
      /**
       * 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*/, int line_size, DCTELEM *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*/, int line_size, DCTELEM *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 -> referece dct -> reference idct -> x)
       * - (x -> referece 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];
      int idct_permutation_type;
  #define FF_NO_IDCT_PERM 1
  #define FF_LIBMPEG2_IDCT_PERM 2
  #define FF_SIMPLE_IDCT_PERM 3
  #define FF_TRANSPOSE_IDCT_PERM 4
  #define FF_PARTTRANS_IDCT_PERM 5
  #define FF_SSE2_IDCT_PERM 6
  
      int (*try_8x8basis)(int16_t rem[64], int16_t weight[64], int16_t basis[64], int scale);
      void (*add_8x8basis)(int16_t rem[64], int16_t basis[64], int scale);
  #define BASIS_SHIFT 16
  #define RECON_SHIFT 6
  
      void (*draw_edges)(uint8_t *buf, int wrap, int width, int height, int w);
  #define EDGE_WIDTH 16
  
      void (*prefetch)(void *mem, int stride, int h);
  
      void (*shrink[4])(uint8_t *dst, int dst_wrap, const uint8_t *src, int src_wrap, int width, int height);
  
      /* mlp/truehd functions */
      void (*mlp_filter_channel)(int32_t *state, const int32_t *coeff,
                                 int firorder, int iirorder,
                                 unsigned int filter_shift, int32_t mask, int blocksize,
                                 int32_t *sample_buffer);
  
      /* vc1 functions */
      void (*vc1_inv_trans_8x8)(DCTELEM *b);
      void (*vc1_inv_trans_8x4)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_4x8)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_4x4)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_8x8_dc)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_8x4_dc)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_4x8_dc)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_inv_trans_4x4_dc)(uint8_t *dest, int line_size, DCTELEM *block);
      void (*vc1_v_overlap)(uint8_t* src, int stride);
      void (*vc1_h_overlap)(uint8_t* src, int stride);
      void (*vc1_v_loop_filter4)(uint8_t *src, int stride, int pq);
      void (*vc1_h_loop_filter4)(uint8_t *src, int stride, int pq);
      void (*vc1_v_loop_filter8)(uint8_t *src, int stride, int pq);
      void (*vc1_h_loop_filter8)(uint8_t *src, int stride, int pq);
      void (*vc1_v_loop_filter16)(uint8_t *src, int stride, int pq);
      void (*vc1_h_loop_filter16)(uint8_t *src, int stride, int pq);
      /* put 8x8 block with bicubic interpolation and quarterpel precision
       * last argument is actually round value instead of height
       */
      op_pixels_func put_vc1_mspel_pixels_tab[16];
      op_pixels_func avg_vc1_mspel_pixels_tab[16];
  
      /* intrax8 functions */
      void (*x8_spatial_compensation[12])(uint8_t *src , uint8_t *dst, int linesize);
      void (*x8_setup_spatial_compensation)(uint8_t *src, uint8_t *dst, int linesize,
             int * range, int * sum,  int edges);
  
      /**
       * Calculate scalar product of two vectors.
       * @param len length of vectors, should be multiple of 16
       * @param shift number of bits to discard from product
       */
      int32_t (*scalarproduct_int16)(int16_t *v1, int16_t *v2/*align 16*/, int len, int shift);
      /* ape functions */
      /**
       * Calculate scalar product of v1 and v2,
       * and v1[i] += v3[i] * mul
       * @param len length of vectors, should be multiple of 16
       */
      int32_t (*scalarproduct_and_madd_int16)(int16_t *v1/*align 16*/, int16_t *v2, int16_t *v3, int len, int mul);
  
      /* rv30 functions */
      qpel_mc_func put_rv30_tpel_pixels_tab[4][16];
      qpel_mc_func avg_rv30_tpel_pixels_tab[4][16];
  
      /* rv40 functions */
      qpel_mc_func put_rv40_qpel_pixels_tab[4][16];
      qpel_mc_func avg_rv40_qpel_pixels_tab[4][16];
      h264_chroma_mc_func put_rv40_chroma_pixels_tab[3];
      h264_chroma_mc_func avg_rv40_chroma_pixels_tab[3];
  
      /* bink functions */
      op_fill_func fill_block_tab[2];
      void (*scale_block)(const uint8_t src[64]/*align 8*/, uint8_t *dst/*align 8*/, int linesize);
  } DSPContext;
  
  void dsputil_static_init(void);
  void dsputil_init(DSPContext* p, AVCodecContext *avctx);
  
  int ff_check_alignment(void);
  
  /**
   * permute block according to permuatation.
   * @param last last non zero element in scantable order
   */
  void ff_block_permute(DCTELEM *block, uint8_t *permutation, const uint8_t *scantable, int last);
  
  void ff_set_cmp(DSPContext* c, me_cmp_func *cmp, int type);
  
  #define         BYTE_VEC32(c)   ((c)*0x01010101UL)
  
  static inline uint32_t rnd_avg32(uint32_t a, uint32_t b)
  {
      return (a | b) - (((a ^ b) & ~BYTE_VEC32(0x01)) >> 1);
  }
  
  static inline uint32_t no_rnd_avg32(uint32_t a, uint32_t b)
  {
      return (a & b) + (((a ^ b) & ~BYTE_VEC32(0x01)) >> 1);
  }
  
  static inline int get_penalty_factor(int lambda, int lambda2, int type){
      switch(type&0xFF){
      default:
      case FF_CMP_SAD:
          return lambda>>FF_LAMBDA_SHIFT;
      case FF_CMP_DCT:
          return (3*lambda)>>(FF_LAMBDA_SHIFT+1);
      case FF_CMP_W53:
          return (4*lambda)>>(FF_LAMBDA_SHIFT);
      case FF_CMP_W97:
          return (2*lambda)>>(FF_LAMBDA_SHIFT);
      case FF_CMP_SATD:
      case FF_CMP_DCT264:
          return (2*lambda)>>FF_LAMBDA_SHIFT;
      case FF_CMP_RD:
      case FF_CMP_PSNR:
      case FF_CMP_SSE:
      case FF_CMP_NSSE:
          return lambda2>>FF_LAMBDA_SHIFT;
      case FF_CMP_BIT:
          return 1;
      }
  }
  
  /**
   * Empty mmx state.
   * this must be called between any dsp function and float/double code.
   * for example sin(); dsp->idct_put(); emms_c(); cos()
   */
  #define emms_c()
  
  /* should be defined by architectures supporting
     one or more MultiMedia extension */
  int mm_support(void);
  extern int mm_flags;
  
  void dsputil_init_alpha(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_arm(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_bfin(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_mlib(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_mmi(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_mmx(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_ppc(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_sh4(DSPContext* c, AVCodecContext *avctx);
  void dsputil_init_vis(DSPContext* c, AVCodecContext *avctx);
  
  void ff_dsputil_init_dwt(DSPContext *c);
  void ff_cavsdsp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_rv30dsp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_rv40dsp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_vc1dsp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_intrax8dsp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_mlp_init(DSPContext* c, AVCodecContext *avctx);
  void ff_mlp_init_x86(DSPContext* c, AVCodecContext *avctx);
  
  #if HAVE_MMX
  
  #undef emms_c
  
  static inline void emms(void)
  {
      __asm__ volatile ("emms;":::"memory");
  }
  
  
  #define emms_c() \
  {\
      if (mm_flags & FF_MM_MMX)\
          emms();\
  }
  
  #elif ARCH_ARM
  
  #if HAVE_NEON
  #   define STRIDE_ALIGN 16
  #endif
  
  #elif ARCH_PPC
  
  #define STRIDE_ALIGN 16
  
  #elif HAVE_MMI
  
  #define STRIDE_ALIGN 16
  
  #else
  
  #define mm_flags 0
  #define mm_support() 0
  
  #endif
  
  #ifndef STRIDE_ALIGN
  #   define STRIDE_ALIGN 8
  #endif
  
  #define LOCAL_ALIGNED(a, t, v, s, ...)                          \
      uint8_t la_##v[sizeof(t s __VA_ARGS__) + (a)];              \
      t (*v) __VA_ARGS__ = (void *)FFALIGN((uintptr_t)la_##v, a)
  
  #if HAVE_LOCAL_ALIGNED_8
  #   define LOCAL_ALIGNED_8(t, v, s, ...) DECLARE_ALIGNED(8, t, v) s __VA_ARGS__
  #else
  #   define LOCAL_ALIGNED_8(t, v, s, ...) LOCAL_ALIGNED(8, t, v, s, __VA_ARGS__)
  #endif
  
  #if HAVE_LOCAL_ALIGNED_16
  #   define LOCAL_ALIGNED_16(t, v, s, ...) DECLARE_ALIGNED(16, t, v) s __VA_ARGS__
  #else
  #   define LOCAL_ALIGNED_16(t, v, s, ...) LOCAL_ALIGNED(16, t, v, s, __VA_ARGS__)
  #endif
  
  /* PSNR */
  void get_psnr(uint8_t *orig_image[3], uint8_t *coded_image[3],
                int orig_linesize[3], int coded_linesize,
                AVCodecContext *avctx);
  
  #define WRAPPER8_16(name8, name16)\
  static int name16(void /*MpegEncContext*/ *s, uint8_t *dst, uint8_t *src, int stride, int h){\
      return name8(s, dst           , src           , stride, h)\
            +name8(s, dst+8         , src+8         , stride, h);\
  }
  
  #define WRAPPER8_16_SQ(name8, name16)\
  static int name16(void /*MpegEncContext*/ *s, uint8_t *dst, uint8_t *src, int stride, int h){\
      int score=0;\
      score +=name8(s, dst           , src           , stride, 8);\
      score +=name8(s, dst+8         , src+8         , stride, 8);\
      if(h==16){\
          dst += 8*stride;\
          src += 8*stride;\
          score +=name8(s, dst           , src           , stride, 8);\
          score +=name8(s, dst+8         , src+8         , stride, 8);\
      }\
      return score;\
  }
  
  
  static inline void copy_block2(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN16(dst   , AV_RN16(src   ));
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  static inline void copy_block4(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN32(dst   , AV_RN32(src   ));
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  static inline void copy_block8(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN32(dst   , AV_RN32(src   ));
          AV_WN32(dst+4 , AV_RN32(src+4 ));
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  static inline void copy_block9(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN32(dst   , AV_RN32(src   ));
          AV_WN32(dst+4 , AV_RN32(src+4 ));
          dst[8]= src[8];
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  static inline void copy_block16(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN32(dst   , AV_RN32(src   ));
          AV_WN32(dst+4 , AV_RN32(src+4 ));
          AV_WN32(dst+8 , AV_RN32(src+8 ));
          AV_WN32(dst+12, AV_RN32(src+12));
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  static inline void copy_block17(uint8_t *dst, const uint8_t *src, int dstStride, int srcStride, int h)
  {
      int i;
      for(i=0; i<h; i++)
      {
          AV_WN32(dst   , AV_RN32(src   ));
          AV_WN32(dst+4 , AV_RN32(src+4 ));
          AV_WN32(dst+8 , AV_RN32(src+8 ));
          AV_WN32(dst+12, AV_RN32(src+12));
          dst[16]= src[16];
          dst+=dstStride;
          src+=srcStride;
      }
  }
  
  #endif /* AVCODEC_DSPUTIL_H */
  