text: /*
   * Copyright (C) 2011-2012 Michael Niedermayer (michaelni@gmx.at)
   *
   * This file is part of libswresample
   *
   * libswresample 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.
   *
   * libswresample 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 libswresample; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "swresample_internal.h"
  #include "libavutil/avassert.h"
  #include "libavutil/channel_layout.h"
  
  #define TEMPLATE_REMATRIX_FLT
  #include "rematrix_template.c"
  #undef TEMPLATE_REMATRIX_FLT
  
  #define TEMPLATE_REMATRIX_DBL
  #include "rematrix_template.c"
  #undef TEMPLATE_REMATRIX_DBL
  
  #define TEMPLATE_REMATRIX_S16
  #include "rematrix_template.c"
  #define TEMPLATE_CLIP
  #include "rematrix_template.c"
  #undef TEMPLATE_CLIP
  #undef TEMPLATE_REMATRIX_S16
  
  #define TEMPLATE_REMATRIX_S32
  #include "rematrix_template.c"
  #undef TEMPLATE_REMATRIX_S32
  
  #define FRONT_LEFT             0
  #define FRONT_RIGHT            1
  #define FRONT_CENTER           2
  #define LOW_FREQUENCY          3
  #define BACK_LEFT              4
  #define BACK_RIGHT             5
  #define FRONT_LEFT_OF_CENTER   6
  #define FRONT_RIGHT_OF_CENTER  7
  #define BACK_CENTER            8
  #define SIDE_LEFT              9
  #define SIDE_RIGHT             10
  #define TOP_CENTER             11
  #define TOP_FRONT_LEFT         12
  #define TOP_FRONT_CENTER       13
  #define TOP_FRONT_RIGHT        14
  #define TOP_BACK_LEFT          15
  #define TOP_BACK_CENTER        16
  #define TOP_BACK_RIGHT         17
  #define NUM_NAMED_CHANNELS     18
  
  int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride)
  {
      int nb_in, nb_out, in, out;
  
      if (!s || s->in_convert) // s needs to be allocated but not initialized
          return AVERROR(EINVAL);
      memset(s->matrix, 0, sizeof(s->matrix));
      memset(s->matrix_flt, 0, sizeof(s->matrix_flt));
      nb_in  = av_get_channel_layout_nb_channels(s->user_in_ch_layout);
      nb_out = av_get_channel_layout_nb_channels(s->user_out_ch_layout);
      for (out = 0; out < nb_out; out++) {
          for (in = 0; in < nb_in; in++)
              s->matrix_flt[out][in] = s->matrix[out][in] = matrix[in];
          matrix += stride;
      }
      s->rematrix_custom = 1;
      return 0;
  }
  
  static int even(int64_t layout){
      if(!layout) return 1;
      if(layout&(layout-1)) return 1;
      return 0;
  }
  
  static int clean_layout(void *s, int64_t layout){
      if(layout && layout != AV_CH_FRONT_CENTER && !(layout&(layout-1))) {
          char buf[128];
          av_get_channel_layout_string(buf, sizeof(buf), -1, layout);
          av_log(s, AV_LOG_VERBOSE, "Treating %s as mono\n", buf);
          return AV_CH_FRONT_CENTER;
      }
  
      return layout;
  }
  
  static int sane_layout(int64_t layout){
      if(!(layout & AV_CH_LAYOUT_SURROUND)) // at least 1 front speaker
          return 0;
      if(!even(layout & (AV_CH_FRONT_LEFT | AV_CH_FRONT_RIGHT))) // no asymetric front
          return 0;
      if(!even(layout & (AV_CH_SIDE_LEFT | AV_CH_SIDE_RIGHT)))   // no asymetric side
          return 0;
      if(!even(layout & (AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT)))
          return 0;
      if(!even(layout & (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)))
          return 0;
      if(av_get_channel_layout_nb_channels(layout) >= SWR_CH_MAX)
          return 0;
  
      return 1;
  }
  
  av_cold int swr_build_matrix(uint64_t in_ch_layout_param, uint64_t out_ch_layout_param,
                               double center_mix_level, double surround_mix_level,
                               double lfe_mix_level, double maxval,
                               double rematrix_volume, double *matrix_param,
                               int stride, enum AVMatrixEncoding matrix_encoding, void *log_context)
  {
      int i, j, out_i;
      double matrix[NUM_NAMED_CHANNELS][NUM_NAMED_CHANNELS]={{0}};
      int64_t unaccounted, in_ch_layout, out_ch_layout;
      double maxcoef=0;
      char buf[128];
  
       in_ch_layout = clean_layout(log_context,  in_ch_layout_param);
      out_ch_layout = clean_layout(log_context, out_ch_layout_param);
  
      if(   out_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
         && (in_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
      )
          out_ch_layout = AV_CH_LAYOUT_STEREO;
  
      if(    in_ch_layout == AV_CH_LAYOUT_STEREO_DOWNMIX
         && (out_ch_layout & AV_CH_LAYOUT_STEREO_DOWNMIX) == 0
      )
          in_ch_layout = AV_CH_LAYOUT_STEREO;
  
      if(!sane_layout(in_ch_layout)){
          av_get_channel_layout_string(buf, sizeof(buf), -1, in_ch_layout_param);
          av_log(log_context, AV_LOG_ERROR, "Input channel layout '%s' is not supported\n", buf);
          return AVERROR(EINVAL);
      }
  
      if(!sane_layout(out_ch_layout)){
          av_get_channel_layout_string(buf, sizeof(buf), -1, out_ch_layout_param);
          av_log(log_context, AV_LOG_ERROR, "Output channel layout '%s' is not supported\n", buf);
          return AVERROR(EINVAL);
      }
  
      for(i=0; i<FF_ARRAY_ELEMS(matrix); i++){
          if(in_ch_layout & out_ch_layout & (1ULL<<i))
              matrix[i][i]= 1.0;
      }
  
      unaccounted= in_ch_layout & ~out_ch_layout;
  
  //FIXME implement dolby surround
  //FIXME implement full ac3
  
  
      if(unaccounted & AV_CH_FRONT_CENTER){
          if((out_ch_layout & AV_CH_LAYOUT_STEREO) == AV_CH_LAYOUT_STEREO){
              if(in_ch_layout & AV_CH_LAYOUT_STEREO) {
                  matrix[ FRONT_LEFT][FRONT_CENTER]+= center_mix_level;
                  matrix[FRONT_RIGHT][FRONT_CENTER]+= center_mix_level;
              } else {
                  matrix[ FRONT_LEFT][FRONT_CENTER]+= M_SQRT1_2;
                  matrix[FRONT_RIGHT][FRONT_CENTER]+= M_SQRT1_2;
              }
          }else
              av_assert0(0);
      }
      if(unaccounted & AV_CH_LAYOUT_STEREO){
          if(out_ch_layout & AV_CH_FRONT_CENTER){
              matrix[FRONT_CENTER][ FRONT_LEFT]+= M_SQRT1_2;
              matrix[FRONT_CENTER][FRONT_RIGHT]+= M_SQRT1_2;
              if(in_ch_layout & AV_CH_FRONT_CENTER)
                  matrix[FRONT_CENTER][ FRONT_CENTER] = center_mix_level*sqrt(2);
          }else
              av_assert0(0);
      }
  
      if(unaccounted & AV_CH_BACK_CENTER){
          if(out_ch_layout & AV_CH_BACK_LEFT){
              matrix[ BACK_LEFT][BACK_CENTER]+= M_SQRT1_2;
              matrix[BACK_RIGHT][BACK_CENTER]+= M_SQRT1_2;
          }else if(out_ch_layout & AV_CH_SIDE_LEFT){
              matrix[ SIDE_LEFT][BACK_CENTER]+= M_SQRT1_2;
              matrix[SIDE_RIGHT][BACK_CENTER]+= M_SQRT1_2;
          }else if(out_ch_layout & AV_CH_FRONT_LEFT){
              if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY ||
                  matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
                  if (unaccounted & (AV_CH_BACK_LEFT | AV_CH_SIDE_LEFT)) {
                      matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level * M_SQRT1_2;
                      matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level * M_SQRT1_2;
                  } else {
                      matrix[FRONT_LEFT ][BACK_CENTER] -= surround_mix_level;
                      matrix[FRONT_RIGHT][BACK_CENTER] += surround_mix_level;
                  }
              } else {
                  matrix[ FRONT_LEFT][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
              }
          }else if(out_ch_layout & AV_CH_FRONT_CENTER){
              matrix[ FRONT_CENTER][BACK_CENTER]+= surround_mix_level * M_SQRT1_2;
          }else
              av_assert0(0);
      }
      if(unaccounted & AV_CH_BACK_LEFT){
          if(out_ch_layout & AV_CH_BACK_CENTER){
              matrix[BACK_CENTER][ BACK_LEFT]+= M_SQRT1_2;
              matrix[BACK_CENTER][BACK_RIGHT]+= M_SQRT1_2;
          }else if(out_ch_layout & AV_CH_SIDE_LEFT){
              if(in_ch_layout & AV_CH_SIDE_LEFT){
                  matrix[ SIDE_LEFT][ BACK_LEFT]+= M_SQRT1_2;
                  matrix[SIDE_RIGHT][BACK_RIGHT]+= M_SQRT1_2;
              }else{
              matrix[ SIDE_LEFT][ BACK_LEFT]+= 1.0;
              matrix[SIDE_RIGHT][BACK_RIGHT]+= 1.0;
              }
          }else if(out_ch_layout & AV_CH_FRONT_LEFT){
              if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
                  matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * M_SQRT1_2;
              } else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
                  matrix[FRONT_LEFT ][BACK_LEFT ] -= surround_mix_level * SQRT3_2;
                  matrix[FRONT_LEFT ][BACK_RIGHT] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][BACK_LEFT ] += surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level * SQRT3_2;
              } else {
                  matrix[ FRONT_LEFT][ BACK_LEFT] += surround_mix_level;
                  matrix[FRONT_RIGHT][BACK_RIGHT] += surround_mix_level;
              }
          }else if(out_ch_layout & AV_CH_FRONT_CENTER){
              matrix[ FRONT_CENTER][BACK_LEFT ]+= surround_mix_level*M_SQRT1_2;
              matrix[ FRONT_CENTER][BACK_RIGHT]+= surround_mix_level*M_SQRT1_2;
          }else
              av_assert0(0);
      }
  
      if(unaccounted & AV_CH_SIDE_LEFT){
          if(out_ch_layout & AV_CH_BACK_LEFT){
              /* if back channels do not exist in the input, just copy side
                 channels to back channels, otherwise mix side into back */
              if (in_ch_layout & AV_CH_BACK_LEFT) {
                  matrix[BACK_LEFT ][SIDE_LEFT ] += M_SQRT1_2;
                  matrix[BACK_RIGHT][SIDE_RIGHT] += M_SQRT1_2;
              } else {
                  matrix[BACK_LEFT ][SIDE_LEFT ] += 1.0;
                  matrix[BACK_RIGHT][SIDE_RIGHT] += 1.0;
              }
          }else if(out_ch_layout & AV_CH_BACK_CENTER){
              matrix[BACK_CENTER][ SIDE_LEFT]+= M_SQRT1_2;
              matrix[BACK_CENTER][SIDE_RIGHT]+= M_SQRT1_2;
          }else if(out_ch_layout & AV_CH_FRONT_LEFT){
              if (matrix_encoding == AV_MATRIX_ENCODING_DOLBY) {
                  matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * M_SQRT1_2;
              } else if (matrix_encoding == AV_MATRIX_ENCODING_DPLII) {
                  matrix[FRONT_LEFT ][SIDE_LEFT ] -= surround_mix_level * SQRT3_2;
                  matrix[FRONT_LEFT ][SIDE_RIGHT] -= surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][SIDE_LEFT ] += surround_mix_level * M_SQRT1_2;
                  matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level * SQRT3_2;
              } else {
                  matrix[ FRONT_LEFT][ SIDE_LEFT] += surround_mix_level;
                  matrix[FRONT_RIGHT][SIDE_RIGHT] += surround_mix_level;
              }
          }else if(out_ch_layout & AV_CH_FRONT_CENTER){
              matrix[ FRONT_CENTER][SIDE_LEFT ]+= surround_mix_level * M_SQRT1_2;
              matrix[ FRONT_CENTER][SIDE_RIGHT]+= surround_mix_level * M_SQRT1_2;
          }else
              av_assert0(0);
      }
  
      if(unaccounted & AV_CH_FRONT_LEFT_OF_CENTER){
          if(out_ch_layout & AV_CH_FRONT_LEFT){
              matrix[ FRONT_LEFT][ FRONT_LEFT_OF_CENTER]+= 1.0;
              matrix[FRONT_RIGHT][FRONT_RIGHT_OF_CENTER]+= 1.0;
          }else if(out_ch_layout & AV_CH_FRONT_CENTER){
              matrix[ FRONT_CENTER][ FRONT_LEFT_OF_CENTER]+= M_SQRT1_2;
              matrix[ FRONT_CENTER][FRONT_RIGHT_OF_CENTER]+= M_SQRT1_2;
          }else
              av_assert0(0);
      }
      /* mix LFE into front left/right or center */
      if (unaccounted & AV_CH_LOW_FREQUENCY) {
          if (out_ch_layout & AV_CH_FRONT_CENTER) {
              matrix[FRONT_CENTER][LOW_FREQUENCY] += lfe_mix_level;
          } else if (out_ch_layout & AV_CH_FRONT_LEFT) {
              matrix[FRONT_LEFT ][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
              matrix[FRONT_RIGHT][LOW_FREQUENCY] += lfe_mix_level * M_SQRT1_2;
          } else
              av_assert0(0);
      }
  
      for(out_i=i=0; i<64; i++){
          double sum=0;
          int in_i=0;
          if((out_ch_layout & (1ULL<<i)) == 0)
              continue;
          for(j=0; j<64; j++){
              if((in_ch_layout & (1ULL<<j)) == 0)
                 continue;
              if (i < FF_ARRAY_ELEMS(matrix) && j < FF_ARRAY_ELEMS(matrix[0]))
                  matrix_param[stride*out_i + in_i] = matrix[i][j];
              else
                  matrix_param[stride*out_i + in_i] = i == j && (in_ch_layout & out_ch_layout & (1ULL<<i));
              sum += fabs(matrix_param[stride*out_i + in_i]);
              in_i++;
          }
          maxcoef= FFMAX(maxcoef, sum);
          out_i++;
      }
      if(rematrix_volume  < 0)
          maxcoef = -rematrix_volume;
  
      if(maxcoef > maxval || rematrix_volume  < 0){
          maxcoef /= maxval;
          for(i=0; i<SWR_CH_MAX; i++)
              for(j=0; j<SWR_CH_MAX; j++){
                  matrix_param[stride*i + j] /= maxcoef;
              }
      }
  
      if(rematrix_volume > 0){
          for(i=0; i<SWR_CH_MAX; i++)
              for(j=0; j<SWR_CH_MAX; j++){
                  matrix_param[stride*i + j] *= rematrix_volume;
              }
      }
  
      av_log(log_context, AV_LOG_DEBUG, "Matrix coefficients:\n");
      for(i=0; i<av_get_channel_layout_nb_channels(out_ch_layout); i++){
          const char *c =
              av_get_channel_name(av_channel_layout_extract_channel(out_ch_layout, i));
          av_log(log_context, AV_LOG_DEBUG, "%s: ", c ? c : "?");
          for(j=0; j<av_get_channel_layout_nb_channels(in_ch_layout); j++){
              c = av_get_channel_name(av_channel_layout_extract_channel(in_ch_layout, j));
              av_log(log_context, AV_LOG_DEBUG, "%s:%f ", c ? c : "?", matrix_param[stride*i + j]);
          }
          av_log(log_context, AV_LOG_DEBUG, "\n");
      }
      return 0;
  }
  
  av_cold static int auto_matrix(SwrContext *s)
  {
      double maxval;
      int ret;
  
      if (s->rematrix_maxval > 0) {
          maxval = s->rematrix_maxval;
      } else if (   av_get_packed_sample_fmt(s->out_sample_fmt) < AV_SAMPLE_FMT_FLT
                 || av_get_packed_sample_fmt(s->int_sample_fmt) < AV_SAMPLE_FMT_FLT) {
          maxval = 1.0;
      } else
          maxval = INT_MAX;
  
      memset(s->matrix, 0, sizeof(s->matrix));
      ret = swr_build_matrix(s->in_ch_layout, s->out_ch_layout,
                             s->clev, s->slev, s->lfe_mix_level,
                             maxval, s->rematrix_volume, (double*)s->matrix,
                             s->matrix[1] - s->matrix[0], s->matrix_encoding, s);
  
      if (ret >= 0 && s->int_sample_fmt == AV_SAMPLE_FMT_FLTP) {
          int i, j;
          for (i = 0; i < FF_ARRAY_ELEMS(s->matrix[0]); i++)
              for (j = 0; j < FF_ARRAY_ELEMS(s->matrix[0]); j++)
                  s->matrix_flt[i][j] = s->matrix[i][j];
      }
  
      return ret;
  }
  
  av_cold int swri_rematrix_init(SwrContext *s){
      int i, j;
      int nb_in  = av_get_channel_layout_nb_channels(s->in_ch_layout);
      int nb_out = av_get_channel_layout_nb_channels(s->out_ch_layout);
  
      s->mix_any_f = NULL;
  
      if (!s->rematrix_custom) {
          int r = auto_matrix(s);
          if (r)
              return r;
      }
      if (s->midbuf.fmt == AV_SAMPLE_FMT_S16P){
          int maxsum = 0;
          s->native_matrix = av_calloc(nb_in * nb_out, sizeof(int));
          s->native_one    = av_mallocz(sizeof(int));
          if (!s->native_matrix || !s->native_one)
              return AVERROR(ENOMEM);
          for (i = 0; i < nb_out; i++) {
              double rem = 0;
              int sum = 0;
  
              for (j = 0; j < nb_in; j++) {
                  double target = s->matrix[i][j] * 32768 + rem;
                  ((int*)s->native_matrix)[i * nb_in + j] = lrintf(target);
                  rem += target - ((int*)s->native_matrix)[i * nb_in + j];
                  sum += FFABS(((int*)s->native_matrix)[i * nb_in + j]);
              }
              maxsum = FFMAX(maxsum, sum);
          }
          *((int*)s->native_one) = 32768;
          if (maxsum <= 32768) {
              s->mix_1_1_f = (mix_1_1_func_type*)copy_s16;
              s->mix_2_1_f = (mix_2_1_func_type*)sum2_s16;
              s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s16(s);
          } else {
              s->mix_1_1_f = (mix_1_1_func_type*)copy_clip_s16;
              s->mix_2_1_f = (mix_2_1_func_type*)sum2_clip_s16;
              s->mix_any_f = (mix_any_func_type*)get_mix_any_func_clip_s16(s);
          }
      }else if(s->midbuf.fmt == AV_SAMPLE_FMT_FLTP){
          s->native_matrix = av_calloc(nb_in * nb_out, sizeof(float));
          s->native_one    = av_mallocz(sizeof(float));
          if (!s->native_matrix || !s->native_one)
              return AVERROR(ENOMEM);
          for (i = 0; i < nb_out; i++)
              for (j = 0; j < nb_in; j++)
                  ((float*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
          *((float*)s->native_one) = 1.0;
          s->mix_1_1_f = (mix_1_1_func_type*)copy_float;
          s->mix_2_1_f = (mix_2_1_func_type*)sum2_float;
          s->mix_any_f = (mix_any_func_type*)get_mix_any_func_float(s);
      }else if(s->midbuf.fmt == AV_SAMPLE_FMT_DBLP){
          s->native_matrix = av_calloc(nb_in * nb_out, sizeof(double));
          s->native_one    = av_mallocz(sizeof(double));
          if (!s->native_matrix || !s->native_one)
              return AVERROR(ENOMEM);
          for (i = 0; i < nb_out; i++)
              for (j = 0; j < nb_in; j++)
                  ((double*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
          *((double*)s->native_one) = 1.0;
          s->mix_1_1_f = (mix_1_1_func_type*)copy_double;
          s->mix_2_1_f = (mix_2_1_func_type*)sum2_double;
          s->mix_any_f = (mix_any_func_type*)get_mix_any_func_double(s);
      }else if(s->midbuf.fmt == AV_SAMPLE_FMT_S32P){
          // Only for dithering currently
  //         s->native_matrix = av_calloc(nb_in * nb_out, sizeof(double));
          s->native_one    = av_mallocz(sizeof(int));
          if (!s->native_one)
              return AVERROR(ENOMEM);
  //         for (i = 0; i < nb_out; i++)
  //             for (j = 0; j < nb_in; j++)
  //                 ((double*)s->native_matrix)[i * nb_in + j] = s->matrix[i][j];
          *((int*)s->native_one) = 32768;
          s->mix_1_1_f = (mix_1_1_func_type*)copy_s32;
          s->mix_2_1_f = (mix_2_1_func_type*)sum2_s32;
          s->mix_any_f = (mix_any_func_type*)get_mix_any_func_s32(s);
      }else
          av_assert0(0);
      //FIXME quantize for integeres
      for (i = 0; i < SWR_CH_MAX; i++) {
          int ch_in=0;
          for (j = 0; j < SWR_CH_MAX; j++) {
              s->matrix32[i][j]= lrintf(s->matrix[i][j] * 32768);
              if(s->matrix[i][j])
                  s->matrix_ch[i][++ch_in]= j;
          }
          s->matrix_ch[i][0]= ch_in;
      }
  
      if(HAVE_X86ASM && HAVE_MMX)
          return swri_rematrix_init_x86(s);
  
      return 0;
  }
  
  av_cold void swri_rematrix_free(SwrContext *s){
      av_freep(&s->native_matrix);
      av_freep(&s->native_one);
      av_freep(&s->native_simd_matrix);
      av_freep(&s->native_simd_one);
  }
  
  int swri_rematrix(SwrContext *s, AudioData *out, AudioData *in, int len, int mustcopy){
      int out_i, in_i, i, j;
      int len1 = 0;
      int off = 0;
  
      if(s->mix_any_f) {
          s->mix_any_f(out->ch, (const uint8_t **)in->ch, s->native_matrix, len);
          return 0;
      }
  
      if(s->mix_2_1_simd || s->mix_1_1_simd){
          len1= len&~15;
          off = len1 * out->bps;
      }
  
      av_assert0(!s->out_ch_layout || out->ch_count == av_get_channel_layout_nb_channels(s->out_ch_layout));
      av_assert0(!s-> in_ch_layout || in ->ch_count == av_get_channel_layout_nb_channels(s-> in_ch_layout));
  
      for(out_i=0; out_i<out->ch_count; out_i++){
          switch(s->matrix_ch[out_i][0]){
          case 0:
              if(mustcopy)
                  memset(out->ch[out_i], 0, len * av_get_bytes_per_sample(s->int_sample_fmt));
              break;
          case 1:
              in_i= s->matrix_ch[out_i][1];
              if(s->matrix[out_i][in_i]!=1.0){
                  if(s->mix_1_1_simd && len1)
                      s->mix_1_1_simd(out->ch[out_i]    , in->ch[in_i]    , s->native_simd_matrix, in->ch_count*out_i + in_i, len1);
                  if(len != len1)
                      s->mix_1_1_f   (out->ch[out_i]+off, in->ch[in_i]+off, s->native_matrix, in->ch_count*out_i + in_i, len-len1);
              }else if(mustcopy){
                  memcpy(out->ch[out_i], in->ch[in_i], len*out->bps);
              }else{
                  out->ch[out_i]= in->ch[in_i];
              }
              break;
          case 2: {
              int in_i1 = s->matrix_ch[out_i][1];
              int in_i2 = s->matrix_ch[out_i][2];
              if(s->mix_2_1_simd && len1)
                  s->mix_2_1_simd(out->ch[out_i]    , in->ch[in_i1]    , in->ch[in_i2]    , s->native_simd_matrix, in->ch_count*out_i + in_i1, in->ch_count*out_i + in_i2, len1);
              else
                  s->mix_2_1_f   (out->ch[out_i]    , in->ch[in_i1]    , in->ch[in_i2]    , s->native_matrix, in->ch_count*out_i + in_i1, in->ch_count*out_i + in_i2, len1);
              if(len != len1)
                  s->mix_2_1_f   (out->ch[out_i]+off, in->ch[in_i1]+off, in->ch[in_i2]+off, s->native_matrix, in->ch_count*out_i + in_i1, in->ch_count*out_i + in_i2, len-len1);
              break;}
          default:
              if(s->int_sample_fmt == AV_SAMPLE_FMT_FLTP){
                  for(i=0; i<len; i++){
                      float v=0;
                      for(j=0; j<s->matrix_ch[out_i][0]; j++){
                          in_i= s->matrix_ch[out_i][1+j];
                          v+= ((float*)in->ch[in_i])[i] * s->matrix_flt[out_i][in_i];
                      }
                      ((float*)out->ch[out_i])[i]= v;
                  }
              }else if(s->int_sample_fmt == AV_SAMPLE_FMT_DBLP){
                  for(i=0; i<len; i++){
                      double v=0;
                      for(j=0; j<s->matrix_ch[out_i][0]; j++){
                          in_i= s->matrix_ch[out_i][1+j];
                          v+= ((double*)in->ch[in_i])[i] * s->matrix[out_i][in_i];
                      }
                      ((double*)out->ch[out_i])[i]= v;
                  }
              }else{
                  for(i=0; i<len; i++){
                      int v=0;
                      for(j=0; j<s->matrix_ch[out_i][0]; j++){
                          in_i= s->matrix_ch[out_i][1+j];
                          v+= ((int16_t*)in->ch[in_i])[i] * s->matrix32[out_i][in_i];
                      }
                      ((int16_t*)out->ch[out_i])[i]= (v + 16384)>>15;
                  }
              }
          }
      }
      return 0;
  }
  