ffmpeg/libavcodec/fmtconvert.h

   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 */