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  1. /*
  2.  * Format Conversion Utils
  3.  * Copyright (c) 2000, 2001 Fabrice Bellard
  4.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "avcodec.h"
  24. #include "fmtconvert.h"
  25. #include "libavutil/common.h"
  26.  
  27. static void int32_to_float_fmul_scalar_c(float *dst, const int32_t *src,
  28.                                          float mul, int len)
  29. {
  30.     int i;
  31.     for(i=0; i<len; i++)
  32.         dst[i] = src[i] * mul;
  33. }
  34.  
  35. static void int32_to_float_fmul_array8_c(FmtConvertContext *c, float *dst,
  36.                                          const int32_t *src, const float *mul,
  37.                                          int len)
  38. {
  39.     int i;
  40.     for (i = 0; i < len; i += 8)
  41.         c->int32_to_float_fmul_scalar(&dst[i], &src[i], *mul++, 8);
  42. }
  43.  
  44. static av_always_inline int float_to_int16_one(const float *src){
  45.     return av_clip_int16(lrintf(*src));
  46. }
  47.  
  48. static void float_to_int16_c(int16_t *dst, const float *src, long len)
  49. {
  50.     int i;
  51.     for(i=0; i<len; i++)
  52.         dst[i] = float_to_int16_one(src+i);
  53. }
  54.  
  55. static void float_to_int16_interleave_c(int16_t *dst, const float **src,
  56.                                         long len, int channels)
  57. {
  58.     int i,j,c;
  59.     if(channels==2){
  60.         for(i=0; i<len; i++){
  61.             dst[2*i]   = float_to_int16_one(src[0]+i);
  62.             dst[2*i+1] = float_to_int16_one(src[1]+i);
  63.         }
  64.     }else{
  65.         for(c=0; c<channels; c++)
  66.             for(i=0, j=c; i<len; i++, j+=channels)
  67.                 dst[j] = float_to_int16_one(src[c]+i);
  68.     }
  69. }
  70.  
  71. void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
  72.                            int channels)
  73. {
  74.     int j, c;
  75.     unsigned int i;
  76.     if (channels == 2) {
  77.         for (i = 0; i < len; i++) {
  78.             dst[2*i]   = src[0][i];
  79.             dst[2*i+1] = src[1][i];
  80.         }
  81.     } else if (channels == 1 && len < INT_MAX / sizeof(float)) {
  82.         memcpy(dst, src[0], len * sizeof(float));
  83.     } else {
  84.         for (c = 0; c < channels; c++)
  85.             for (i = 0, j = c; i < len; i++, j += channels)
  86.                 dst[j] = src[c][i];
  87.     }
  88. }
  89.  
  90. av_cold void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx)
  91. {
  92.     c->int32_to_float_fmul_scalar = int32_to_float_fmul_scalar_c;
  93.     c->int32_to_float_fmul_array8 = int32_to_float_fmul_array8_c;
  94.     c->float_to_int16             = float_to_int16_c;
  95.     c->float_to_int16_interleave  = float_to_int16_interleave_c;
  96.     c->float_interleave           = ff_float_interleave_c;
  97.  
  98.     if (ARCH_ARM) ff_fmt_convert_init_arm(c, avctx);
  99.     if (ARCH_PPC) ff_fmt_convert_init_ppc(c, avctx);
  100.     if (ARCH_X86) ff_fmt_convert_init_x86(c, avctx);
  101.     if (HAVE_MIPSFPU) ff_fmt_convert_init_mips(c);
  102. }
  103.  
  104. /* ffdshow custom code */
  105. void float_interleave(float *dst, const float **src, long len, int channels)
  106. {
  107.     int i,j,c;
  108.     if(channels==2){
  109.         for(i=0; i<len; i++){
  110.             dst[2*i]   = src[0][i] / 32768.0f;
  111.             dst[2*i+1] = src[1][i] / 32768.0f;
  112.         }
  113.     }else{
  114.         for(c=0; c<channels; c++)
  115.             for(i=0, j=c; i<len; i++, j+=channels)
  116.                 dst[j] = src[c][i] / 32768.0f;
  117.     }
  118. }
  119.  
  120. void float_interleave_noscale(float *dst, const float **src, long len, int channels)
  121. {
  122.     int i,j,c;
  123.     if(channels==2){
  124.         for(i=0; i<len; i++){
  125.             dst[2*i]   = src[0][i];
  126.             dst[2*i+1] = src[1][i];
  127.         }
  128.     }else{
  129.         for(c=0; c<channels; c++)
  130.             for(i=0, j=c; i<len; i++, j+=channels)
  131.                 dst[j] = src[c][i];
  132.     }
  133. }
  134.