annotate audio_convert.c @ 205:2cae459bc47e

Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 10 Jan 2002 01:15:11 +0000
parents 907e3776d2f4
children fbbb1f25b944
rev   line source
141
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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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 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 /*
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24 * This file was derived from SDL's SDL_audiocvt.c and is an attempt to
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25 * address the shortcomings of it.
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26 *
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27 * Perhaps we can adapt some good filters from SoX?
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28 */
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29
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30 #if HAVE_CONFIG_H
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31 # include <config.h>
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32 #endif
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33
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34 #include "SDL.h"
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35 #include "SDL_sound.h"
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36
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37 #define __SDL_SOUND_INTERNAL__
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38 #include "SDL_sound_internal.h"
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39
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40 /* Functions for audio drivers to perform runtime conversion of audio format */
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41
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42
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43 /*
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44 * Toggle endianness. This filter is, of course, only applied to 16-bit
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45 * audio data.
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46 */
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47
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48 void Sound_ConvertEndian(Sound_AudioCVT *cvt, Uint16 *format)
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49 {
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50 int i;
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51 Uint8 *data, tmp;
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52
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53 /* SNDDBG(("Converting audio endianness\n")); */
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54
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55 data = cvt->buf;
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56
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57 for (i = cvt->len_cvt / 2; i; --i)
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58 {
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59 tmp = data[0];
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60 data[0] = data[1];
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61 data[1] = tmp;
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62 data += 2;
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63 } /* for */
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64
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65 *format = (*format ^ 0x1000);
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66 } /* Sound_ConvertEndian */
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67
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68
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69 /*
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70 * Toggle signed/unsigned. Apparently this is done by toggling the most
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71 * significant bit of each sample.
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72 */
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73
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74 void Sound_ConvertSign(Sound_AudioCVT *cvt, Uint16 *format)
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75 {
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76 int i;
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77 Uint8 *data;
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78
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79 /* SNDDBG(("Converting audio signedness\n")); */
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80
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81 data = cvt->buf;
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82
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83 /* 16-bit sound? */
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84 if ((*format & 0xFF) == 16)
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85 {
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86 /* Little-endian? */
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87 if ((*format & 0x1000) != 0x1000)
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88 ++data;
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89
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90 for (i = cvt->len_cvt / 2; i; --i)
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91 {
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92 *data ^= 0x80;
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93 data += 2;
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94 } /* for */
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95 } /* if */
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96 else
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97 {
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98 for (i = cvt->len_cvt; i; --i)
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99 *data++ ^= 0x80;
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100 } /* else */
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101
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102 *format = (*format ^ 0x8000);
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103 } /* Sound_ConvertSign */
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104
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105
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106 /*
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107 * Convert 16-bit to 8-bit. This is done by taking the most significant byte
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108 * of each 16-bit sample.
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109 */
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110
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111 void Sound_Convert8(Sound_AudioCVT *cvt, Uint16 *format)
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112 {
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113 int i;
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114 Uint8 *src, *dst;
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115
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116 /* SNDDBG(("Converting to 8-bit\n")); */
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117
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118 src = cvt->buf;
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119 dst = cvt->buf;
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120
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121 /* Little-endian? */
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122 if ((*format & 0x1000) != 0x1000)
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123 ++src;
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124
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125 for (i = cvt->len_cvt / 2; i; --i)
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126 {
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127 *dst = *src;
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128 src += 2;
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129 dst += 1;
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130 } /* for */
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131
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132 *format = ((*format & ~0x9010) | AUDIO_U8);
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133 cvt->len_cvt /= 2;
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134 } /* Sound_Convert8 */
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135
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136
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137 /* Convert 8-bit to 16-bit - LSB */
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138
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139 void Sound_Convert16LSB(Sound_AudioCVT *cvt, Uint16 *format)
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140 {
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141 int i;
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142 Uint8 *src, *dst;
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143
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144 /* SNDDBG(("Converting to 16-bit LSB\n")); */
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145
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146 src = cvt->buf + cvt->len_cvt;
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147 dst = cvt->buf + cvt->len_cvt * 2;
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148
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149 for (i = cvt->len_cvt; i; --i)
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150 {
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151 src -= 1;
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152 dst -= 2;
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153 dst[1] = *src;
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154 dst[0] = 0;
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155 } /* for */
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156
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157 *format = ((*format & ~0x0008) | AUDIO_U16LSB);
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158 cvt->len_cvt *= 2;
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159 } /* Sound_Convert16LSB */
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160
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161
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162 /* Convert 8-bit to 16-bit - MSB */
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163
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164 void Sound_Convert16MSB(Sound_AudioCVT *cvt, Uint16 *format)
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165 {
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166 int i;
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167 Uint8 *src, *dst;
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168
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169 /* SNDDBG(("Converting to 16-bit MSB\n")); */
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170
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171 src = cvt->buf + cvt->len_cvt;
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172 dst = cvt->buf + cvt->len_cvt * 2;
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173
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diff changeset
174 for (i = cvt->len_cvt; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
175 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 src -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177 dst -= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178 dst[0] = *src;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 dst[1] = 0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
182 *format = ((*format & ~0x0008) | AUDIO_U16MSB);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
183 cvt->len_cvt *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
184 } /* Sound_Convert16MSB */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
185
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
186
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
187 /* Duplicate a mono channel to both stereo channels */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
188
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 void Sound_ConvertStereo(Sound_AudioCVT *cvt, Uint16 *format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191 int i;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 /* SNDDBG(("Converting to stereo\n")); */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195 /* 16-bit sound? */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 if ((*format & 0xFF) == 16)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 Uint16 *src, *dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 src = (Uint16 *) (cvt->buf + cvt->len_cvt);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201 dst = (Uint16 *) (cvt->buf + cvt->len_cvt * 2);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203 for (i = cvt->len_cvt/2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
204 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
205 dst -= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
206 src -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 dst[1] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
210 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
211 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 Uint8 *src, *dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
215 src = cvt->buf + cvt->len_cvt;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
216 dst = cvt->buf + cvt->len_cvt * 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
217
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
218 for (i = cvt->len_cvt; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 dst -= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221 src -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223 dst[1] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 cvt->len_cvt *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
228 } /* Sound_ConvertStereo */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
229
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
230
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 /* Effectively mix right and left channels into a single channel */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233 void Sound_ConvertMono(Sound_AudioCVT *cvt, Uint16 *format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 int i;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 Sint32 sample;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 Uint8 *u_src, *u_dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 Sint8 *s_src, *s_dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240 /* SNDDBG(("Converting to mono\n")); */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 switch (*format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 case AUDIO_U8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245 u_src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246 u_dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
247
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
248 for (i = cvt->len_cvt / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 sample = u_src[0] + u_src[1];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 *u_dst = (sample > 255) ? 255 : sample;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 u_src += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 u_dst += 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
255 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
256
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
257 case AUDIO_S8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
258 s_src = (Sint8 *) cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
259 s_dst = (Sint8 *) cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
260
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
261 for (i = cvt->len_cvt / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
262 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
263 sample = s_src[0] + s_src[1];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
264 if (sample > 127)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
265 *s_dst = 127;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
266 else if (sample < -128)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
267 *s_dst = -128;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
268 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
269 *s_dst = sample;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
270
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
271 s_src += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
272 s_dst += 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
273 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
274 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
275
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
276 case AUDIO_U16MSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
277 u_src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
278 u_dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
279
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
280 for (i = cvt->len_cvt / 4; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
281 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
282 sample = (Uint16) ((u_src[0] << 8) | u_src[1])
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
283 + (Uint16) ((u_src[2] << 8) | u_src[3]);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284 if (sample > 65535)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 u_dst[0] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287 u_dst[1] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 u_dst[1] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 sample >>= 8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 u_dst[0] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295 u_src += 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 u_dst += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 case AUDIO_U16LSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301 u_src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 u_dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 for (i = cvt->len_cvt / 4; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
305 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
306 sample = (Uint16) ((u_src[1] << 8) | u_src[0])
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
307 + (Uint16) ((u_src[3] << 8) | u_src[2]);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
308 if (sample > 65535)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
309 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
310 u_dst[0] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
311 u_dst[1] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
312 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
313 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
314 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
315 u_dst[0] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
316 sample >>= 8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
317 u_dst[1] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
318 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
319 u_src += 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
320 u_dst += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
321 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
322 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
323
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
324 case AUDIO_S16MSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
325 u_src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
326 u_dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
327
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
328 for (i = cvt->len_cvt / 4; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
329 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
330 sample = (Sint16) ((u_src[0] << 8) | u_src[1])
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
331 + (Sint16) ((u_src[2] << 8) | u_src[3]);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
332 if (sample > 32767)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
333 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
334 u_dst[0] = 0x7F;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
335 u_dst[1] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
336 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
337 else if (sample < -32768)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
338 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
339 u_dst[0] = 0x80;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
340 u_dst[1] = 0x00;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
341 } /* else if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
342 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
343 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
344 u_dst[1] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
345 sample >>= 8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
346 u_dst[0] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
347 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
348 u_src += 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
349 u_dst += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
350 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
351 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
352
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
353 case AUDIO_S16LSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
354 u_src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
355 u_dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
356
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
357 for (i = cvt->len_cvt / 4; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
358 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
359 sample = (Sint16) ((u_src[1] << 8) | u_src[0])
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
360 + (Sint16) ((u_src[3] << 8) | u_src[2]);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
361 if (sample > 32767)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
362 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
363 u_dst[1] = 0x7F;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
364 u_dst[0] = 0xFF;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
365 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
366 else if (sample < -32768)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
367 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
368 u_dst[1] = 0x80;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
369 u_dst[0] = 0x00;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
370 } /* else if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
371 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
372 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
373 u_dst[0] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
374 sample >>= 8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
375 u_dst[1] = (sample & 0xFF);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
376 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
377 u_src += 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
378 u_dst += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
379 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
380 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
381 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
382
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
383 cvt->len_cvt /= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
384 } /* Sound_ConvertMono */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
385
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
386
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
387 /* Convert rate up by multiple of 2 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
388
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
389 void Sound_RateMUL2(Sound_AudioCVT *cvt, Uint16 *format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
390 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
391 int i;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
392 Uint8 *src, *dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
393
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
394 /* SNDDBG(("Converting audio rate * 2\n")); */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
395
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
396 src = cvt->buf + cvt->len_cvt;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
397 dst = cvt->buf + cvt->len_cvt*2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
398
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
399 /* 8- or 16-bit sound? */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
400 switch (*format & 0xFF)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
401 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
402 case 8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
403 for (i = cvt->len_cvt; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
404 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
405 src -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
406 dst -= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
407 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
408 dst[1] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
409 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
410 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
411
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
412 case 16:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
413 for (i = cvt->len_cvt / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
414 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
415 src -= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
416 dst -= 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
417 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
418 dst[1] = src[1];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
419 dst[2] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
420 dst[3] = src[1];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
421 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
422 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
423 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
424
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
425 cvt->len_cvt *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
426 } /* Sound_RateMUL2 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
427
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
428
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
429 /* Convert rate down by multiple of 2 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
430
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
431 void Sound_RateDIV2(Sound_AudioCVT *cvt, Uint16 *format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
432 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
433 int i;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
434 Uint8 *src, *dst;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
435
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
436 /* SNDDBG(("Converting audio rate / 2\n")); */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
437
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
438 src = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
439 dst = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
440
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
441 /* 8- or 16-bit sound? */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
442 switch (*format & 0xFF)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
443 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
444 case 8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
445 for (i = cvt->len_cvt / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
446 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
447 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
448 src += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
449 dst += 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
450 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
451 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
452
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
453 case 16:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
454 for (i = cvt->len_cvt / 4; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
455 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
456 dst[0] = src[0];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
457 dst[1] = src[1];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
458 src += 4;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
459 dst += 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
460 }
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
461 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
462 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
463
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
464 cvt->len_cvt /= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
465 } /* Sound_RateDIV2 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
466
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
467
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
468 /* Very slow rate conversion routine */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
469
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
470 void Sound_RateSLOW(Sound_AudioCVT *cvt, Uint16 *format)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
471 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
472 double ipos;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
473 int i, clen;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
474 Uint8 *output8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
475 Uint16 *output16;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
476
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
477 /* SNDDBG(("Converting audio rate * %4.4f\n", 1.0/cvt->rate_incr)); */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
478
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
479 clen = (int) ((double) cvt->len_cvt / cvt->rate_incr);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
480
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
481 if (cvt->rate_incr > 1.0)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
482 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
483 /* 8- or 16-bit sound? */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
484 switch (*format & 0xFF)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
485 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
486 case 8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
487 output8 = cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
488
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
489 ipos = 0.0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
490 for (i = clen; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
491 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
492 *output8 = cvt->buf[(int) ipos];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
493 ipos += cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
494 output8 += 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
495 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
496 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
497
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
498 case 16:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
499 output16 = (Uint16 *) cvt->buf;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
500
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
501 clen &= ~1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
502 ipos = 0.0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
503 for (i = clen / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
504 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
505 *output16 = ((Uint16 *) cvt->buf)[(int) ipos];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
506 ipos += cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
507 output16 += 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
508 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
509 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
510 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
511 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
512 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
513 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
514 /* 8- or 16-bit sound */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
515 switch (*format & 0xFF)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
516 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
517 case 8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
518 output8 = cvt->buf + clen;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
519
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
520 ipos = (double) cvt->len_cvt;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
521 for (i = clen; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
522 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
523 ipos -= cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
524 output8 -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
525 *output8 = cvt->buf[(int) ipos];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
526 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
527 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
528
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
529 case 16:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
530 clen &= ~1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
531 output16 = (Uint16 *) (cvt->buf + clen);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
532 ipos = (double) cvt->len_cvt / 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
533 for (i = clen / 2; i; --i)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
534 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
535 ipos -= cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
536 output16 -= 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
537 *output16 = ((Uint16 *) cvt->buf)[(int) ipos];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
538 } /* for */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
539 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
540 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
541 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
542
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
543 cvt->len_cvt = clen;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
544 } /* Sound_RateSLOW */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
545
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
546
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
547 int Sound_ConvertAudio(Sound_AudioCVT *cvt)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
548 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
549 Uint16 format;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
550
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
551 /* Make sure there's data to convert */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
552 if (cvt->buf == NULL)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
553 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
554 Sound_SetError("No buffer allocated for conversion");
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
555 return(-1);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
556 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
557
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
558 /* Return okay if no conversion is necessary */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
559 cvt->len_cvt = cvt->len;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
560 if (cvt->filters[0] == NULL)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
561 return(0);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
562
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
563 /* Set up the conversion and go! */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
564 format = cvt->src_format;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
565 for (cvt->filter_index = 0; cvt->filters[cvt->filter_index];
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
566 cvt->filter_index++)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
567 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
568 cvt->filters[cvt->filter_index](cvt, &format);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
569 }
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
570 return(0);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
571 } /* Sound_ConvertAudio */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
572
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
573
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
574 /*
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
575 * Creates a set of audio filters to convert from one format to another.
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
576 * Returns -1 if the format conversion is not supported, or 1 if the
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
577 * audio filter is set up.
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
578 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
579
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
580 int Sound_BuildAudioCVT(Sound_AudioCVT *cvt,
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
581 Uint16 src_format, Uint8 src_channels, Uint32 src_rate,
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
582 Uint16 dst_format, Uint8 dst_channels, Uint32 dst_rate)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
583 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
584 /* Start off with no conversion necessary */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
585 cvt->needed = 0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
586 cvt->filter_index = 0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
587 cvt->filters[0] = NULL;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
588 cvt->len_mult = 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
589 cvt->len_ratio = 1.0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
590
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
591 /* First filter: Endian conversion from src to dst */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
592 if ((src_format & 0x1000) != (dst_format & 0x1000) &&
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
593 ((src_format & 0xff) != 8))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
594 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
595 SNDDBG(("Adding filter: Sound_ConvertEndian\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
596 cvt->filters[cvt->filter_index++] = Sound_ConvertEndian;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
597 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
598
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
599 /* Second filter: Sign conversion -- signed/unsigned */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
600 if ((src_format & 0x8000) != (dst_format & 0x8000))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
601 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
602 SNDDBG(("Adding filter: Sound_ConvertSign\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
603 cvt->filters[cvt->filter_index++] = Sound_ConvertSign;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
604 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
605
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
606 /* Next filter: Convert 16 bit <--> 8 bit PCM. */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
607 if ((src_format & 0xFF) != (dst_format & 0xFF))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
608 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
609 switch (dst_format & 0x10FF)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
610 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
611 case AUDIO_U8:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
612 SNDDBG(("Adding filter: Sound_Convert8\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
613 cvt->filters[cvt->filter_index++] = Sound_Convert8;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
614 cvt->len_ratio /= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
615 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
616
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
617 case AUDIO_U16LSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
618 SNDDBG(("Adding filter: Sound_Convert16LSB\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
619 cvt->filters[cvt->filter_index++] = Sound_Convert16LSB;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
620 cvt->len_mult *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
621 cvt->len_ratio *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
622 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
623
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
624 case AUDIO_U16MSB:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
625 SNDDBG(("Adding filter: Sound_Convert16MSB\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
626 cvt->filters[cvt->filter_index++] = Sound_Convert16MSB;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
627 cvt->len_mult *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
628 cvt->len_ratio *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
629 break;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
630 } /* switch */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
631 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
632
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
633 /* Next filter: Mono/Stereo conversion */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
634 if (src_channels != dst_channels)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
635 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
636 while ((src_channels * 2) <= dst_channels)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
637 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
638 SNDDBG(("Adding filter: Sound_ConvertStereo\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
639 cvt->filters[cvt->filter_index++] = Sound_ConvertStereo;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
640 cvt->len_mult *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
641 src_channels *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
642 cvt->len_ratio *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
643 } /* while */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
644
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
645 /* This assumes that 4 channel audio is in the format:
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
646 * Left {front/back} + Right {front/back}
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
647 * so converting to L/R stereo works properly.
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
648 */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
649 while (((src_channels % 2) == 0) &&
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
650 ((src_channels / 2) >= dst_channels))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
651 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
652 SNDDBG(("Adding filter: Sound_ConvertMono\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
653 cvt->filters[cvt->filter_index++] = Sound_ConvertMono;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
654 src_channels /= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
655 cvt->len_ratio /= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
656 } /* while */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
657
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
658 if ( src_channels != dst_channels ) {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
659 /* Uh oh.. */;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
660 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
661 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
662
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
663 /* Do rate conversion */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
664 cvt->rate_incr = 0.0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
665 if ((src_rate / 100) != (dst_rate / 100))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
666 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
667 Uint32 hi_rate, lo_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
668 int len_mult;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
669 double len_ratio;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
670 void (*rate_cvt)(Sound_AudioCVT *cvt, Uint16 *format);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
671
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
672 if (src_rate > dst_rate)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
673 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
674 hi_rate = src_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
675 lo_rate = dst_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
676 SNDDBG(("Adding filter: Sound_RateDIV2\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
677 rate_cvt = Sound_RateDIV2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
678 len_mult = 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
679 len_ratio = 0.5;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
680 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
681 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
682 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
683 hi_rate = dst_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
684 lo_rate = src_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
685 SNDDBG(("Adding filter: Sound_RateMUL2\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
686 rate_cvt = Sound_RateMUL2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
687 len_mult = 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
688 len_ratio = 2.0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
689 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
690
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
691 /* If hi_rate = lo_rate*2^x then conversion is easy */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
692 while (((lo_rate * 2) / 100) <= (hi_rate / 100))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
693 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
694 cvt->filters[cvt->filter_index++] = rate_cvt;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
695 cvt->len_mult *= len_mult;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
696 lo_rate *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
697 cvt->len_ratio *= len_ratio;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
698 } /* while */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
699
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
700 /* We may need a slow conversion here to finish up */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
701 if ((lo_rate / 100) != (hi_rate / 100))
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
702 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
703 if (src_rate < dst_rate)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
704 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
705 cvt->rate_incr = (double) lo_rate / hi_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
706 cvt->len_mult *= 2;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
707 cvt->len_ratio /= cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
708 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
709 else
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
710 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
711 cvt->rate_incr = (double) hi_rate / lo_rate;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
712 cvt->len_ratio *= cvt->rate_incr;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
713 } /* else */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
714 SNDDBG(("Adding filter: Sound_RateSLOW\n"));
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
715 cvt->filters[cvt->filter_index++] = Sound_RateSLOW;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
716 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
717 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
718
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
719 /* Set up the filter information */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
720 if (cvt->filter_index != 0)
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
721 {
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
722 cvt->needed = 1;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
723 cvt->src_format = src_format;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
724 cvt->dst_format = dst_format;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
725 cvt->len = 0;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
726 cvt->buf = NULL;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
727 cvt->filters[cvt->filter_index] = NULL;
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
728 } /* if */
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
729
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
730 return(cvt->needed);
907e3776d2f4 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
731 } /* Sound_BuildAudioCVT */