Mercurial > SDL_sound_CoreAudio

annotate mixer/converters.c @ 579:6927c489964c

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Bug fix for CoreAudio seeking. Comments inline in code.
author Eric Wing <ewing@anscamobile.com>
date Mon, 08 Nov 2010 21:02:49 -0800
parents 2e8907ff98e9
children
rev   line source
486
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1 /*
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2 * SDL_sound -- An sound processing toolkit.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /**
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21 * This file implements the mixer itself. Largely, this is handled in the
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22 * SDL audio callback.
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23 *
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24 * Documentation is in SDL_sound.h ... It's verbose, honest. :)
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25 *
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2e8907ff98e9 Replaced references to COPYING with references to LICENSE.txt ...
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26 * Please see the file LICENSE.txt in the source's root directory.
486
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27 *
526
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28 * This file written by Ryan C. Gordon. (icculus@icculus.org)
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29 */
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30
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31 #if HAVE_CONFIG_H
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32 # include <config.h>
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33 #endif
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34
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35 #include <stdio.h>
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36 #include <stdlib.h>
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37 #include <string.h>
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38
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39 #include "SDL.h"
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40 #include "SDL_thread.h"
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41 #include "SDL_sound.h"
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42
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43 #define __SDL_SOUND_INTERNAL__
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44 #include "SDL_sound_internal.h"
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45
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46
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47 static void conv_mix_buf_u8_mono(void *userdata, Uint8 *_stream, int len)
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48 {
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49 register Uint8 *stream = _stream;
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50 register Uint32 i;
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51 register Uint32 max = len * 2;
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52 for (i = 0; i < max; i += 2)
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53 {
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54 *stream = (Uint8) ((((mixbuf[i]+mixbuf[i+1])*0.5f) * 127.0f) + 128.0f);
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55 stream++;
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56 } /* for */
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57 } /* conv_mix_buf_s8s */
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58
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59 static void conv_mix_buf_s8_mono(void *userdata, Uint8 *_stream, int len)
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60 {
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61 register Uint32 i;
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62 register Sint8 *stream = (Sint8 *) _stream;
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63 register Uint32 max = len * 2;
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64 for (i = 0; i < max; i += 2)
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65 {
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66 *stream = (Sint8) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 127.0f);
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67 stream++;
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68 } /* for */
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69 } /* conv_mix_buf_s8s */
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70
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71 static void conv_mix_buf_s16_lsb_mono(void *userdata, Uint8 *_stream, int len)
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72 {
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73 register Uint32 i;
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74 register Sint16 *stream = (Sint16 *) _stream;
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75 register Sint16 val;
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76 register Uint32 max = len / 2;
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77 for (i = 0; i < max; i += 2)
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78 {
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79 val = (Sint16) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 32767.0f);
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80 *stream = SDL_SwapLE16(val);
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81 stream++;
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82 } /* for */
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83 } /* conv_mix_buf_s16_lsb_mono */
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84
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85 static void conv_mix_buf_s16_msb_mono(void *userdata, Uint8 *_stream, int len)
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86 {
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87 register Uint32 i;
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88 register Sint16 *stream = (Sint16 *) _stream;
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89 register Sint16 val;
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90 register Uint32 max = len / 2;
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91 for (i = 0; i < max; i += 2)
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92 {
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93 val = (Sint16) (((mixbuf[i] + mixbuf[i+1]) * 0.5f) * 32767.0f);
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94 *stream = SDL_SwapBE16(val);
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95 stream++;
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96 } /* for */
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97 } /* conv_mix_buf_s16_msb_mono */
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98
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99 static void conv_mix_buf_u16_lsb_mono(void *userdata, Uint8 *_stream, int len)
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100 {
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101 register Uint32 i;
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102 register Uint16 *stream = (Uint16 *) _stream;
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103 register Uint16 val;
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104 register Uint32 max = len / 2;
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105 for (i = 0; i < max; i += 2)
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106 {
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107 val = (Uint16)((((mixbuf[i]+mixbuf[i+1])*0.5f) * 32767.0f) + 32768.0f);
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108 *stream = SDL_SwapLE16(val);
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109 stream++;
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110 } /* for */
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111 } /* conv_mix_buf_s16_lsb_mono */
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112
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113 static void conv_mix_buf_u16_msb_mono(void *userdata, Uint8 *_stream, int len)
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114 {
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115 register Uint32 i;
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116 register Uint16 *stream = (Uint16 *) _stream;
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117 register Uint16 val;
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118 register Uint32 max = len / 2;
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119 for (i = 0; i < max; i += 2)
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120 {
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121 val = (Uint16)((((mixbuf[i]+mixbuf[i+1])*0.5f) * 32767.0f) + 32768.0f);
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122 *stream = SDL_SwapBE16(val);
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123 stream++;
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124 } /* for */
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125 } /* conv_mix_buf_s16_lsb_mono */
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126
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127 static void conv_mix_buf_u8_stereo(void *userdata, Uint8 *_stream, int len)
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128 {
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129 register Uint32 i;
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130 register Uint8 *stream = _stream;
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131 register Uint32 max = len;
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132 for (i = 0; i < max; i++)
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133 {
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134 *stream = (Uint8) ((mixbuf[i] * 127.0f) + 128.0f);
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135 stream++;
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136 } /* for */
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137 } /* conv_mix_buf_s8s */
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138
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139 static void conv_mix_buf_s8_stereo(void *userdata, Uint8 *_stream, int len)
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140 {
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141 register Uint32 i;
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142 register Sint8 *stream = (Sint8 *) _stream;
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143 register Uint32 max = len;
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144 for (i = 0; i < max; i++)
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145 {
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146 *stream = (Sint8) (mixbuf[i] * 127.0f);
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147 stream++;
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148 } /* for */
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149 } /* conv_mix_buf_s8s */
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150
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151 static void conv_mix_buf_s16lsb_stereo(void *userdata, Uint8 *_stream, int len)
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152 {
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153 register Uint32 i;
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154 register Sint16 *stream = (Sint16 *) _stream;
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155 register Sint16 val;
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156 register Uint32 max = len / 2;
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157 for (i = 0; i < max; i++)
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158 {
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159 val = (Sint16) (mixbuf[i] * 32767.0f);
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160 *stream = SDL_SwapLE16(val);
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161 stream++;
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162 } /* for */
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163 } /* conv_mix_buf_s16_lsb_stereo */
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164
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165 static void conv_mix_buf_s16msb_stereo(void *userdata, Uint8 *_stream, int len)
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166 {
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167 register Uint32 i;
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168 register Sint16 *stream = (Sint16 *) _stream;
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169 register Sint16 val;
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170 register Uint32 max = len / 2;
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171 for (i = 0; i < max; i++)
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172 {
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173 val = (Sint16) (mixbuf[i] * 32767.0f);
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174 *stream = SDL_SwapBE16(val);
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175 stream++;
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176 } /* for */
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177 } /* conv_mix_buf_s16_msb_stereo */
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178
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179 static void conv_mix_buf_u16lsb_stereo(void *userdata, Uint8 *_stream, int len)
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180 {
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181 register Uint32 i;
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182 register Uint16 *stream = (Uint16 *) _stream;
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183 register Uint16 val;
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184 register Uint32 max = len / 2;
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185 for (i = 0; i < max; i++)
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186 {
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187 val = (Uint16) ((mixbuf[i] * 32767.0f) + 32768.0f);
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188 *stream = SDL_SwapLE16(val);
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189 stream++;
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190 } /* for */
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191 } /* conv_mix_buf_s16_lsb_stereo */
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192
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193 static void conv_mix_buf_u16msb_stereo(void *userdata, Uint8 *_stream, int len)
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194 {
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195 register Uint32 i;
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196 register Uint16 *stream = (Uint16 *) _stream;
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197 register Uint16 val;
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198 register Uint32 max = len / 2;
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199 for (i = 0; i < max; i++)
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200 {
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201 val = (Uint16) ((mixbuf[i] * 32767.0f) + 32768.0f);
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202 *stream = SDL_SwapBE16(val);
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203 stream++;
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204 } /* for */
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205 } /* conv_mix_buf_s16_msb_stereo */
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206
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207 /* end of converters.c ... */
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208