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 27static 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 35static 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 44static av_always_inline int float_to_int16_one(const float *src){ 45 return av_clip_int16(lrintf(*src)); 46} 47 48static 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 55static 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 71void 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 90av_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 */ 105void 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 120void 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