LCOV - code coverage report
Current view: top level - src/libswresample - dither_template.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 29 0.0 %
Date: 2017-01-19 23:52:33 Functions: 0 4 0.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of libswresample
       3             :  *
       4             :  * libswresample 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             :  * libswresample 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 libswresample; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #if defined(TEMPLATE_DITHER_DBL)
      20             : #    define RENAME(N) N ## _double
      21             : #    define DELEM  double
      22             : #    define CLIP(v) while(0)
      23             : 
      24             : #elif defined(TEMPLATE_DITHER_FLT)
      25             : #    define RENAME(N) N ## _float
      26             : #    define DELEM  float
      27             : #    define CLIP(v) while(0)
      28             : 
      29             : #elif defined(TEMPLATE_DITHER_S32)
      30             : #    define RENAME(N) N ## _int32
      31             : #    define DELEM  int32_t
      32             : #    define CLIP(v) v = FFMAX(FFMIN(v, INT32_MAX), INT32_MIN)
      33             : 
      34             : #elif defined(TEMPLATE_DITHER_S16)
      35             : #    define RENAME(N) N ## _int16
      36             : #    define DELEM  int16_t
      37             : #    define CLIP(v) v = FFMAX(FFMIN(v, INT16_MAX), INT16_MIN)
      38             : 
      39             : #else
      40             : ERROR
      41             : #endif
      42             : 
      43           0 : void RENAME(swri_noise_shaping)(SwrContext *s, AudioData *dsts, const AudioData *srcs, const AudioData *noises, int count){
      44           0 :     int pos = s->dither.ns_pos;
      45             :     int i, j, ch;
      46           0 :     int taps  = s->dither.ns_taps;
      47           0 :     float S   = s->dither.ns_scale;
      48           0 :     float S_1 = s->dither.ns_scale_1;
      49             : 
      50             :     av_assert2((taps&3) != 2);
      51             :     av_assert2((taps&3) != 3 || s->dither.ns_coeffs[taps] == 0);
      52             : 
      53           0 :     for (ch=0; ch<srcs->ch_count; ch++) {
      54           0 :         const float *noise = ((const float *)noises->ch[ch]) + s->dither.noise_pos;
      55           0 :         const DELEM *src = (const DELEM*)srcs->ch[ch];
      56           0 :         DELEM *dst = (DELEM*)dsts->ch[ch];
      57           0 :         float *ns_errors = s->dither.ns_errors[ch];
      58           0 :         const float *ns_coeffs = s->dither.ns_coeffs;
      59           0 :         pos  = s->dither.ns_pos;
      60           0 :         for (i=0; i<count; i++) {
      61           0 :             double d1, d = src[i]*S_1;
      62           0 :             for(j=0; j<taps-2; j+=4) {
      63           0 :                 d -= ns_coeffs[j    ] * ns_errors[pos + j    ]
      64           0 :                     +ns_coeffs[j + 1] * ns_errors[pos + j + 1]
      65           0 :                     +ns_coeffs[j + 2] * ns_errors[pos + j + 2]
      66           0 :                     +ns_coeffs[j + 3] * ns_errors[pos + j + 3];
      67             :             }
      68           0 :             if(j < taps)
      69           0 :                 d -= ns_coeffs[j] * ns_errors[pos + j];
      70           0 :             pos = pos ? pos - 1 : taps - 1;
      71           0 :             d1 = rint(d + noise[i]);
      72           0 :             ns_errors[pos + taps] = ns_errors[pos] = d1 - d;
      73           0 :             d1 *= S;
      74           0 :             CLIP(d1);
      75           0 :             dst[i] = d1;
      76             :         }
      77             :     }
      78             : 
      79           0 :     s->dither.ns_pos = pos;
      80           0 : }
      81             : 
      82             : #undef RENAME
      83             : #undef DELEM
      84             : #undef CLIP

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