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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. #ifndef AVCODEC_FMTCONVERT_H
  24. #define AVCODEC_FMTCONVERT_H
  25.  
  26. #include "avcodec.h"
  27.  
  28. typedef struct FmtConvertContext {
  29.     /**
  30.      * Convert an array of int32_t to float and multiply by a float value.
  31.      * @param dst destination array of float.
  32.      *            constraints: 16-byte aligned
  33.      * @param src source array of int32_t.
  34.      *            constraints: 16-byte aligned
  35.      * @param len number of elements to convert.
  36.      *            constraints: multiple of 8
  37.      */
  38.     void (*int32_to_float_fmul_scalar)(float *dst, const int32_t *src,
  39.                                        float mul, int len);
  40.  
  41.     /**
  42.      * Convert an array of int32_t to float and multiply by a float value from another array,
  43.      * stepping along the float array once for each 8 integers.
  44.      * @param c   pointer to FmtConvertContext.
  45.      * @param dst destination array of float.
  46.      *            constraints: 16-byte aligned
  47.      * @param src source array of int32_t.
  48.      *            constraints: 16-byte aligned
  49.      * @param mul source array of float multipliers.
  50.      * @param len number of elements to convert.
  51.      *            constraints: multiple of 8
  52.      */
  53.     void (*int32_to_float_fmul_array8)(struct FmtConvertContext *c,
  54.                                        float *dst, const int32_t *src,
  55.                                        const float *mul, int len);
  56.  
  57.     /**
  58.      * Convert an array of float to an array of int16_t.
  59.      *
  60.      * Convert floats from in the range [-32768.0,32767.0] to ints
  61.      * without rescaling
  62.      *
  63.      * @param dst destination array of int16_t.
  64.      *            constraints: 16-byte aligned
  65.      * @param src source array of float.
  66.      *            constraints: 16-byte aligned
  67.      * @param len number of elements to convert.
  68.      *            constraints: multiple of 8
  69.      */
  70.     void (*float_to_int16)(int16_t *dst, const float *src, long len);
  71.  
  72.     /**
  73.      * Convert multiple arrays of float to an interleaved array of int16_t.
  74.      *
  75.      * Convert floats from in the range [-32768.0,32767.0] to ints
  76.      * without rescaling
  77.      *
  78.      * @param dst destination array of interleaved int16_t.
  79.      *            constraints: 16-byte aligned
  80.      * @param src source array of float arrays, one for each channel.
  81.      *            constraints: 16-byte aligned
  82.      * @param len number of elements to convert.
  83.      *            constraints: multiple of 8
  84.      * @param channels number of channels
  85.      */
  86.     void (*float_to_int16_interleave)(int16_t *dst, const float **src,
  87.                                       long len, int channels);
  88.  
  89.     /**
  90.      * Convert multiple arrays of float to an array of interleaved float.
  91.      *
  92.      * @param dst destination array of interleaved float.
  93.      *            constraints: 16-byte aligned
  94.      * @param src source array of float arrays, one for each channel.
  95.      *            constraints: 16-byte aligned
  96.      * @param len number of elements to convert.
  97.      *            constraints: multiple of 8
  98.      * @param channels number of channels
  99.      */
  100.     void (*float_interleave)(float *dst, const float **src, unsigned int len,
  101.                              int channels);
  102. } FmtConvertContext;
  103.  
  104. void ff_float_interleave_c(float *dst, const float **src, unsigned int len,
  105.                            int channels);
  106.  
  107. void ff_fmt_convert_init(FmtConvertContext *c, AVCodecContext *avctx);
  108.  
  109. void ff_fmt_convert_init_arm(FmtConvertContext *c, AVCodecContext *avctx);
  110. void ff_fmt_convert_init_ppc(FmtConvertContext *c, AVCodecContext *avctx);
  111. void ff_fmt_convert_init_x86(FmtConvertContext *c, AVCodecContext *avctx);
  112. void ff_fmt_convert_init_mips(FmtConvertContext *c);
  113.  
  114. /* ffdshow custom code */
  115. void float_interleave(float *dst, const float **src, long len, int channels);
  116. void float_interleave_noscale(float *dst, const float **src, long len, int channels);
  117.  
  118. #endif /* AVCODEC_FMTCONVERT_H */
  119.