annotate src/audio/sun/SDL_sunaudio.c @ 1361:19418e4422cb

New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Allow access to a raw mixing buffer */
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24
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25 #include <fcntl.h>
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26 #include <errno.h>
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27 #ifdef __NetBSD__
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28 #include <sys/ioctl.h>
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29 #include <sys/audioio.h>
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30 #endif
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31 #ifdef __SVR4
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32 #include <sys/audioio.h>
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33 #else
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34 #include <sys/time.h>
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35 #include <sys/types.h>
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36 #endif
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37 #include <unistd.h>
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38
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39 #include "SDL_timer.h"
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40 #include "SDL_audio.h"
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41 #include "../SDL_audiomem.h"
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42 #include "../SDL_audio_c.h"
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43 #include "../SDL_audiodev_c.h"
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44 #include "SDL_sunaudio.h"
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45
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46 /* Open the audio device for playback, and don't block if busy */
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47 #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK)
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48
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49 /* Audio driver functions */
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50 static int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec);
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51 static void DSP_WaitAudio(_THIS);
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52 static void DSP_PlayAudio(_THIS);
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53 static Uint8 *DSP_GetAudioBuf(_THIS);
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54 static void DSP_CloseAudio(_THIS);
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55
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56 /* Audio driver bootstrap functions */
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57
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58 static int Audio_Available(void)
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59 {
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60 int fd;
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61 int available;
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62
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63 available = 0;
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64 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 1);
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65 if ( fd >= 0 ) {
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66 available = 1;
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67 close(fd);
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68 }
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69 return(available);
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70 }
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71
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72 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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73 {
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74 SDL_free(device->hidden);
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75 SDL_free(device);
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76 }
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77
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78 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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79 {
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80 SDL_AudioDevice *this;
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81
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82 /* Initialize all variables that we clean on shutdown */
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83 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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84 if ( this ) {
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85 SDL_memset(this, 0, (sizeof *this));
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86 this->hidden = (struct SDL_PrivateAudioData *)
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87 SDL_malloc((sizeof *this->hidden));
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88 }
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89 if ( (this == NULL) || (this->hidden == NULL) ) {
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90 SDL_OutOfMemory();
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91 if ( this ) {
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92 SDL_free(this);
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93 }
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94 return(0);
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95 }
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96 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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97 audio_fd = -1;
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98
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99 /* Set the function pointers */
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100 this->OpenAudio = DSP_OpenAudio;
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101 this->WaitAudio = DSP_WaitAudio;
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102 this->PlayAudio = DSP_PlayAudio;
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103 this->GetAudioBuf = DSP_GetAudioBuf;
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104 this->CloseAudio = DSP_CloseAudio;
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105
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106 this->free = Audio_DeleteDevice;
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107
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108 return this;
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109 }
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110
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111 AudioBootStrap SUNAUDIO_bootstrap = {
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112 "audio", "UNIX /dev/audio interface",
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113 Audio_Available, Audio_CreateDevice
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114 };
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115
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116 #ifdef DEBUG_AUDIO
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117 void CheckUnderflow(_THIS)
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118 {
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119 #ifdef AUDIO_GETINFO
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120 audio_info_t info;
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121 int left;
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122
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123 ioctl(audio_fd, AUDIO_GETINFO, &info);
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124 left = (written - info.play.samples);
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125 if ( written && (left == 0) ) {
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126 fprintf(stderr, "audio underflow!\n");
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127 }
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128 #endif
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129 }
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130 #endif
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131
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132 void DSP_WaitAudio(_THIS)
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133 {
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134 #ifdef AUDIO_GETINFO
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135 #define SLEEP_FUDGE 10 /* 10 ms scheduling fudge factor */
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136 audio_info_t info;
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137 Sint32 left;
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138
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139 ioctl(audio_fd, AUDIO_GETINFO, &info);
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140 left = (written - info.play.samples);
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141 if ( left > fragsize ) {
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142 Sint32 sleepy;
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143
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144 sleepy = ((left - fragsize)/frequency);
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145 sleepy -= SLEEP_FUDGE;
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146 if ( sleepy > 0 ) {
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147 SDL_Delay(sleepy);
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148 }
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149 }
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150 #else
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151 fd_set fdset;
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152
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153 FD_ZERO(&fdset);
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154 FD_SET(audio_fd, &fdset);
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155 select(audio_fd+1, NULL, &fdset, NULL, NULL);
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156 #endif
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157 }
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158
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159 static Uint8 snd2au(int sample);
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160 void DSP_PlayAudio(_THIS)
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161 {
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162 /* Write the audio data */
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163 if ( ulaw_only ) {
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164 /* Assuming that this->spec.freq >= 8000 Hz */
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165 int accum, incr, pos;
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parents:
diff changeset
166 Uint8 *aubuf;
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parents:
diff changeset
167
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parents:
diff changeset
168 accum = 0;
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parents:
diff changeset
169 incr = this->spec.freq/8;
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parents:
diff changeset
170 aubuf = ulaw_buf;
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parents:
diff changeset
171 switch (audio_fmt & 0xFF) {
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parents:
diff changeset
172 case 8: {
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parents:
diff changeset
173 Uint8 *sndbuf;
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parents:
diff changeset
174
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parents:
diff changeset
175 sndbuf = mixbuf;
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parents:
diff changeset
176 for ( pos=0; pos < fragsize; ++pos ) {
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parents:
diff changeset
177 *aubuf = snd2au((0x80-*sndbuf)*64);
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parents:
diff changeset
178 accum += incr;
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parents:
diff changeset
179 while ( accum > 0 ) {
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parents:
diff changeset
180 accum -= 1000;
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parents:
diff changeset
181 sndbuf += 1;
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parents:
diff changeset
182 }
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parents:
diff changeset
183 aubuf += 1;
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parents:
diff changeset
184 }
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parents:
diff changeset
185 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
186 break;
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parents:
diff changeset
187 case 16: {
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parents:
diff changeset
188 Sint16 *sndbuf;
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parents:
diff changeset
189
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parents:
diff changeset
190 sndbuf = (Sint16 *)mixbuf;
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parents:
diff changeset
191 for ( pos=0; pos < fragsize; ++pos ) {
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parents:
diff changeset
192 *aubuf = snd2au(*sndbuf/4);
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parents:
diff changeset
193 accum += incr;
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parents:
diff changeset
194 while ( accum > 0 ) {
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parents:
diff changeset
195 accum -= 1000;
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parents:
diff changeset
196 sndbuf += 1;
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parents:
diff changeset
197 }
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parents:
diff changeset
198 aubuf += 1;
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parents:
diff changeset
199 }
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parents:
diff changeset
200 }
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parents:
diff changeset
201 break;
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parents:
diff changeset
202 }
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parents:
diff changeset
203 #ifdef DEBUG_AUDIO
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parents:
diff changeset
204 CheckUnderflow(this);
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parents:
diff changeset
205 #endif
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parents:
diff changeset
206 if ( write(audio_fd, ulaw_buf, fragsize) < 0 ) {
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parents:
diff changeset
207 /* Assume fatal error, for now */
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parents:
diff changeset
208 this->enabled = 0;
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parents:
diff changeset
209 }
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parents:
diff changeset
210 written += fragsize;
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parents:
diff changeset
211 } else {
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parents:
diff changeset
212 #ifdef DEBUG_AUDIO
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parents:
diff changeset
213 CheckUnderflow(this);
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parents:
diff changeset
214 #endif
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parents:
diff changeset
215 if ( write(audio_fd, mixbuf, this->spec.size) < 0 ) {
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parents:
diff changeset
216 /* Assume fatal error, for now */
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parents:
diff changeset
217 this->enabled = 0;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
218 }
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parents:
diff changeset
219 written += fragsize;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
220 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
221 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
222
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parents:
diff changeset
223 Uint8 *DSP_GetAudioBuf(_THIS)
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parents:
diff changeset
224 {
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parents:
diff changeset
225 return(mixbuf);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
226 }
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parents:
diff changeset
227
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parents:
diff changeset
228 void DSP_CloseAudio(_THIS)
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parents:
diff changeset
229 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
230 if ( mixbuf != NULL ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
231 SDL_FreeAudioMem(mixbuf);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
232 mixbuf = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
233 }
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parents:
diff changeset
234 if ( ulaw_buf != NULL ) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
235 SDL_free(ulaw_buf);
0
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parents:
diff changeset
236 ulaw_buf = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 close(audio_fd);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239 }
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 int DSP_OpenAudio(_THIS, SDL_AudioSpec *spec)
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 char audiodev[1024];
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244 #ifdef AUDIO_SETINFO
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 int enc;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 #endif
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247 int desired_freq = spec->freq;
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parents:
diff changeset
248
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parents:
diff changeset
249 /* Initialize our freeable variables, in case we fail*/
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parents:
diff changeset
250 audio_fd = -1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
251 mixbuf = NULL;
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parents:
diff changeset
252 ulaw_buf = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
253
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parents:
diff changeset
254 /* Determine the audio parameters from the AudioSpec */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 switch ( spec->format & 0xFF ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
256
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 case 8: { /* Unsigned 8 bit audio data */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 spec->format = AUDIO_U8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 #ifdef AUDIO_SETINFO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 enc = AUDIO_ENCODING_LINEAR8;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 case 16: { /* Signed 16 bit audio data */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 spec->format = AUDIO_S16SYS;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 #ifdef AUDIO_SETINFO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
268 enc = AUDIO_ENCODING_LINEAR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
271 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 default: {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
274 SDL_SetError("Unsupported audio format");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 audio_fmt = spec->format;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
280 /* Open the audio device */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 if ( audio_fd < 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 SDL_SetError("Couldn't open %s: %s", audiodev,
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 strerror(errno));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 ulaw_only = 0; /* modern Suns do support linear audio */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 #ifdef AUDIO_SETINFO
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 for(;;) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 audio_info_t info;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 AUDIO_INITINFO(&info); /* init all fields to "no change" */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294 /* Try to set the requested settings */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 info.play.sample_rate = spec->freq;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296 info.play.channels = spec->channels;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 info.play.precision = (enc == AUDIO_ENCODING_ULAW)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 ? 8 : spec->format & 0xff;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299 info.play.encoding = enc;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 if( ioctl(audio_fd, AUDIO_SETINFO, &info) == 0 ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 /* Check to be sure we got what we wanted */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304 SDL_SetError("Error getting audio parameters: %s",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 strerror(errno));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 if(info.play.encoding == enc
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 && info.play.precision == (spec->format & 0xff)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 && info.play.channels == spec->channels) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 /* Yow! All seems to be well! */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312 spec->freq = info.play.sample_rate;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 switch(enc) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 case AUDIO_ENCODING_LINEAR8:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319 /* unsigned 8bit apparently not supported here */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 enc = AUDIO_ENCODING_LINEAR;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 spec->format = AUDIO_S16SYS;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 break; /* try again */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 case AUDIO_ENCODING_LINEAR:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325 /* linear 16bit didn't work either, resort to µ-law */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 enc = AUDIO_ENCODING_ULAW;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327 spec->channels = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 spec->freq = 8000;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 spec->format = AUDIO_U8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330 ulaw_only = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 /* oh well... */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 SDL_SetError("Error setting audio parameters: %s",
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 strerror(errno));
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
340 #endif /* AUDIO_SETINFO */
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341 written = 0;
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342
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343 /* We can actually convert on-the-fly to U-Law */
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344 if ( ulaw_only ) {
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345 spec->freq = desired_freq;
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346 fragsize = (spec->samples*1000)/(spec->freq/8);
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347 frequency = 8;
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348 ulaw_buf = (Uint8 *)SDL_malloc(fragsize);
0
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349 if ( ulaw_buf == NULL ) {
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350 SDL_OutOfMemory();
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351 return(-1);
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352 }
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353 spec->channels = 1;
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354 } else {
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355 fragsize = spec->samples;
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356 frequency = spec->freq/1000;
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357 }
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358 #ifdef DEBUG_AUDIO
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359 fprintf(stderr, "Audio device %s U-Law only\n",
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360 ulaw_only ? "is" : "is not");
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361 fprintf(stderr, "format=0x%x chan=%d freq=%d\n",
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362 spec->format, spec->channels, spec->freq);
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363 #endif
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364
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365 /* Update the fragment size as size in bytes */
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366 SDL_CalculateAudioSpec(spec);
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367
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368 /* Allocate mixing buffer */
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369 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size);
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370 if ( mixbuf == NULL ) {
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371 SDL_OutOfMemory();
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372 return(-1);
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373 }
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374 SDL_memset(mixbuf, spec->silence, spec->size);
0
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375
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376 /* We're ready to rock and roll. :-) */
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377 return(0);
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378 }
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379
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380 /************************************************************************/
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381 /* This function (snd2au()) copyrighted: */
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382 /************************************************************************/
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383 /* Copyright 1989 by Rich Gopstein and Harris Corporation */
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384 /* */
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385 /* Permission to use, copy, modify, and distribute this software */
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386 /* and its documentation for any purpose and without fee is */
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387 /* hereby granted, provided that the above copyright notice */
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388 /* appears in all copies and that both that copyright notice and */
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389 /* this permission notice appear in supporting documentation, and */
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390 /* that the name of Rich Gopstein and Harris Corporation not be */
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391 /* used in advertising or publicity pertaining to distribution */
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392 /* of the software without specific, written prior permission. */
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393 /* Rich Gopstein and Harris Corporation make no representations */
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394 /* about the suitability of this software for any purpose. It */
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395 /* provided "as is" without express or implied warranty. */
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396 /************************************************************************/
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397
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398 static Uint8 snd2au(int sample)
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399 {
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400
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401 int mask;
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402
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403 if (sample < 0) {
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404 sample = -sample;
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405 mask = 0x7f;
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406 } else {
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407 mask = 0xff;
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408 }
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409
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410 if (sample < 32) {
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411 sample = 0xF0 | (15 - sample / 2);
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412 } else if (sample < 96) {
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413 sample = 0xE0 | (15 - (sample - 32) / 4);
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414 } else if (sample < 224) {
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415 sample = 0xD0 | (15 - (sample - 96) / 8);
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416 } else if (sample < 480) {
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417 sample = 0xC0 | (15 - (sample - 224) / 16);
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418 } else if (sample < 992) {
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419 sample = 0xB0 | (15 - (sample - 480) / 32);
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420 } else if (sample < 2016) {
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421 sample = 0xA0 | (15 - (sample - 992) / 64);
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422 } else if (sample < 4064) {
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423 sample = 0x90 | (15 - (sample - 2016) / 128);
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424 } else if (sample < 8160) {
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425 sample = 0x80 | (15 - (sample - 4064) / 256);
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426 } else {
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427 sample = 0x80;
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428 }
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429 return (mask & sample);
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430 }