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annotate src/audio/macrom/SDL_romaudio.c @ 2042:3908e1f808e1

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Fixed bug #292 I might be on crack here. It looks like SDL_ConvertMono() in src/audio/SDL_audiocvt.c adds the left and right channels of a stereo stream together, and clamps the new mono channel if it would overflow. Shouldn't it be dividing by 2 to average the two sample points instead of clamping? Otherwise the mono sample point's volume doubles in the conversion. This would also make the conversion faster, as it replaces two branches per sample frame with a bitwise shift. --ryan.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 24 Sep 2006 15:56:36 +0000
parents c27292a690b7
children 5f6550e5184f 8225ef1f4dee
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 #include "SDL_config.h"
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23
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24 #if defined(__APPLE__) && defined(__MACH__)
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25 # include <Carbon/Carbon.h>
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26 #elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335)
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27 # include <Carbon.h>
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28 #else
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29 # include <Sound.h> /* SoundManager interface */
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30 # include <Gestalt.h>
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31 # include <DriverServices.h>
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32 #endif
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33
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34 #if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335)
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35 #if !defined(NewSndCallBackProc) /* avoid circular redefinition... */
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36 #define NewSndCallBackUPP NewSndCallBackProc
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37 #endif
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38 #if !defined(NewSndCallBackUPP)
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39 #define NewSndCallBackUPP NewSndCallBackProc
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40 #endif
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41 #endif
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42
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43 #include "SDL_audio.h"
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44 #include "../SDL_audio_c.h"
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45 #include "../SDL_sysaudio.h"
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46 #include "SDL_romaudio.h"
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47
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48 /* Audio driver functions */
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49
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50 static void Mac_CloseAudio(_THIS);
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51 static int Mac_OpenAudio(_THIS, SDL_AudioSpec * spec);
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52 static void Mac_LockAudio(_THIS);
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53 static void Mac_UnlockAudio(_THIS);
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54
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55 /* Audio driver bootstrap functions */
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56
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57
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58 static int
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59 Audio_Available(void)
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60 {
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61 return (1);
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62 }
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63
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64 static void
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65 Audio_DeleteDevice(SDL_AudioDevice * device)
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66 {
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67 SDL_free(device->hidden);
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68 SDL_free(device);
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69 }
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70
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71 static SDL_AudioDevice *
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72 Audio_CreateDevice(int devindex)
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73 {
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74 SDL_AudioDevice *this;
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75
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76 /* Initialize all variables that we clean on shutdown */
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77 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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78 if (this) {
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79 SDL_memset(this, 0, (sizeof *this));
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80 this->hidden = (struct SDL_PrivateAudioData *)
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81 SDL_malloc((sizeof *this->hidden));
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82 }
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83 if ((this == NULL) || (this->hidden == NULL)) {
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84 SDL_OutOfMemory();
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85 if (this) {
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86 SDL_free(this);
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87 }
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88 return (0);
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89 }
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90 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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91
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92 /* Set the function pointers */
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93 this->OpenAudio = Mac_OpenAudio;
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94 this->CloseAudio = Mac_CloseAudio;
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95 this->LockAudio = Mac_LockAudio;
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96 this->UnlockAudio = Mac_UnlockAudio;
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97 this->free = Audio_DeleteDevice;
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98
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99 #ifdef __MACOSX__ /* Mac OS X uses threaded audio, so normal thread code is okay */
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100 this->LockAudio = NULL;
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101 this->UnlockAudio = NULL;
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102 #endif
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103 return this;
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104 }
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105
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106 AudioBootStrap SNDMGR_bootstrap = {
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107 "sndmgr", "MacOS SoundManager 3.0",
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108 Audio_Available, Audio_CreateDevice
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109 };
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110
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111 #if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE)
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112 /* This works correctly on Mac OS X */
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113
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114 #pragma options align=power
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115
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116 static volatile SInt32 audio_is_locked = 0;
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117 static volatile SInt32 need_to_mix = 0;
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118
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119 static UInt8 *buffer[2];
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120 static volatile UInt32 running = 0;
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121 static CmpSoundHeader header;
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122 static volatile Uint32 fill_me = 0;
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123
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124 static void
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125 mix_buffer(SDL_AudioDevice * audio, UInt8 * buffer)
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126 {
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127 if (!audio->paused) {
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128 #ifdef __MACOSX__
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129 SDL_mutexP(audio->mixer_lock);
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130 #endif
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131 if (audio->convert.needed) {
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132 audio->spec.callback(audio->spec.userdata,
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133 (Uint8 *) audio->convert.buf,
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134 audio->convert.len);
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135 SDL_ConvertAudio(&audio->convert);
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136 if (audio->convert.len_cvt != audio->spec.size) {
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137 /* Uh oh... probably crashes here */ ;
323
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138 }
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139 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
323
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140 } else {
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141 audio->spec.callback(audio->spec.userdata, buffer,
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142 audio->spec.size);
323
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143 }
1402
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144 #ifdef __MACOSX__
348
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145 SDL_mutexV(audio->mixer_lock);
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146 #endif
323
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147 }
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148
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149 DecrementAtomic((SInt32 *) & need_to_mix);
323
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150 }
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151
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152 static void
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153 Mac_LockAudio(_THIS)
323
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154 {
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155 IncrementAtomic((SInt32 *) & audio_is_locked);
323
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156 }
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157
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158 static void
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159 Mac_UnlockAudio(_THIS)
323
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160 {
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161 SInt32 oldval;
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162
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163 oldval = DecrementAtomic((SInt32 *) & audio_is_locked);
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164 if (oldval != 1) /* != 1 means audio is still locked. */
323
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165 return;
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166
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167 /* Did we miss the chance to mix in an interrupt? Do it now. */
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168 if (BitAndAtomic(0xFFFFFFFF, (UInt32 *) & need_to_mix)) {
323
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169 /*
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170 * Note that this could be a problem if you missed an interrupt
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171 * while the audio was locked, and get preempted by a second
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172 * interrupt here, but that means you locked for way too long anyhow.
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173 */
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174 mix_buffer(this, buffer[fill_me]);
323
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175 }
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176 }
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177
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178 static void
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179 callBackProc(SndChannel * chan, SndCommand * cmd_passed)
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180 {
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181 UInt32 play_me;
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182 SndCommand cmd;
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183 SDL_AudioDevice *audio = (SDL_AudioDevice *) chan->userInfo;
323
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184
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185 IncrementAtomic((SInt32 *) & need_to_mix);
323
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diff changeset
186
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187 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */
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188 play_me = !fill_me; /* filled buffer to play _now_ */
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189
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190 if (!audio->enabled) {
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191 return;
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192 }
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193
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194 /* queue previously mixed buffer for playback. */
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195 header.samplePtr = (Ptr) buffer[play_me];
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196 cmd.cmd = bufferCmd;
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197 cmd.param1 = 0;
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198 cmd.param2 = (long) &header;
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199 SndDoCommand(chan, &cmd, 0);
47
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200
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201 memset(buffer[fill_me], 0, audio->spec.size);
47
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diff changeset
202
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203 /*
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204 * if audio device isn't locked, mix the next buffer to be queued in
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205 * the memory block that just finished playing.
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206 */
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207 if (!BitAndAtomic(0xFFFFFFFF, (UInt32 *) & audio_is_locked)) {
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208 mix_buffer(audio, buffer[fill_me]);
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209 }
323
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diff changeset
210
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211 /* set this callback to run again when current buffer drains. */
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212 if (running) {
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213 cmd.cmd = callBackCmd;
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214 cmd.param1 = 0;
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215 cmd.param2 = play_me;
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216
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217 SndDoCommand(chan, &cmd, 0);
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218 }
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219 }
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220
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221 static int
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222 Mac_OpenAudio(_THIS, SDL_AudioSpec * spec)
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223 {
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224
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225 SndCallBackUPP callback;
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226 int sample_bits;
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227 int i;
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228 long initOptions;
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229
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230 /* Very few conversions are required, but... */
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231 switch (spec->format) {
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232 case AUDIO_S8:
0
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233 spec->format = AUDIO_U8;
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234 break;
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235 case AUDIO_U16LSB:
0
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236 spec->format = AUDIO_S16LSB;
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237 break;
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238 case AUDIO_U16MSB:
0
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239 spec->format = AUDIO_S16MSB;
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240 break;
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241 case AUDIO_F32LSB:
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242 spec->format = AUDIO_F32MSB;
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243 break;
0
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244 }
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245 SDL_CalculateAudioSpec(spec);
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246
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247 /* initialize bufferCmd header */
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248 memset(&header, 0, sizeof(header));
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249 callback = (SndCallBackUPP) NewSndCallBackUPP(callBackProc);
0
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250 sample_bits = spec->size / spec->samples / spec->channels * 8;
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251
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252 #ifdef DEBUG_AUDIO
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253 fprintf(stderr,
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254 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n",
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255 spec->format, spec->channels, sample_bits, spec->freq);
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256 #endif /* DEBUG_AUDIO */
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257
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258 header.numChannels = spec->channels;
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259 header.sampleSize = sample_bits;
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260 header.sampleRate = spec->freq << 16;
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261 header.numFrames = spec->samples;
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diff changeset
262 header.encode = cmpSH;
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diff changeset
263
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264 /* Note that we install the 16bitLittleEndian Converter if needed. */
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diff changeset
265 if (spec->format == AUDIO_S16LSB) {
0
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266 header.compressionID = fixedCompression;
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diff changeset
267 header.format = k16BitLittleEndianFormat;
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268 } else if (spec->format == AUDIO_S32MSB) {
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269 header.compressionID = fixedCompression;
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270 header.format = k32BitFormat;
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271 } else if (spec->format == AUDIO_S32LSB) {
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272 header.compressionID = fixedCompression;
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273 header.format = k32BitLittleEndianFormat;
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274 } else if (spec->format == AUDIO_F32MSB) {
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275 header.compressionID = fixedCompression;
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276 header.format = kFloat32Format;
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277 }
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278
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279 /* allocate 2 buffers */
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280 for (i = 0; i < 2; i++) {
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281 buffer[i] = (UInt8 *) malloc(sizeof(UInt8) * spec->size);
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282 if (buffer[i] == NULL) {
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283 SDL_OutOfMemory();
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284 return (-1);
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285 }
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286 memset(buffer[i], 0, spec->size);
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287 }
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288
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289 /* Create the sound manager channel */
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290 channel = (SndChannelPtr) SDL_malloc(sizeof(*channel));
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291 if (channel == NULL) {
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292 SDL_OutOfMemory();
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293 return (-1);
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294 }
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295 if (spec->channels >= 2) {
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296 initOptions = initStereo;
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297 } else {
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298 initOptions = initMono;
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299 }
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300 channel->userInfo = (long) this;
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301 channel->qLength = 128;
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302 if (SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr) {
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303 SDL_SetError("Unable to create audio channel");
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304 SDL_free(channel);
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305 channel = NULL;
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306 return (-1);
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307 }
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308
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309 /* start playback */
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310 {
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311 SndCommand cmd;
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312 cmd.cmd = callBackCmd;
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313 cmd.param2 = 0;
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314 running = 1;
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315 SndDoCommand(channel, &cmd, 0);
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316 }
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317
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318 return 1;
0
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319 }
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320
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321 static void
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322 Mac_CloseAudio(_THIS)
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323 {
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324
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325 int i;
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326
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327 running = 0;
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328
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329 if (channel) {
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330 SndDisposeChannel(channel, true);
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331 channel = NULL;
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332 }
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333
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334 for (i = 0; i < 2; ++i) {
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335 if (buffer[i]) {
1336
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336 SDL_free(buffer[i]);
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337 buffer[i] = NULL;
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338 }
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339 }
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340 }
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341
323
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diff changeset
342 #else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */
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diff changeset
343
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344 static void
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345 Mac_LockAudio(_THIS)
323
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diff changeset
346 {
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diff changeset
347 /* no-op. */
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diff changeset
348 }
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diff changeset
349
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350 static void
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351 Mac_UnlockAudio(_THIS)
323
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diff changeset
352 {
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diff changeset
353 /* no-op. */
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diff changeset
354 }
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diff changeset
355
0
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356
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357 /* This function is called by Sound Manager when it has exhausted one of
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diff changeset
358 the buffers, so we'll zero it to silence and fill it with audio if
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359 we're not paused.
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360 */
1895
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diff changeset
361 static pascal void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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362 sndDoubleBackProc(SndChannelPtr chan, SndDoubleBufferPtr newbuf)
0
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diff changeset
363 {
1895
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364 SDL_AudioDevice *audio = (SDL_AudioDevice *) newbuf->dbUserInfo[0];
0
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365
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366 /* If audio is quitting, don't do anything */
1895
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367 if (!audio->enabled) {
0
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368 return;
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369 }
1895
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370 memset(newbuf->dbSoundData, 0, audio->spec.size);
0
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371 newbuf->dbNumFrames = audio->spec.samples;
1895
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372 if (!audio->paused) {
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373 if (audio->convert.needed) {
0
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374 audio->spec.callback(audio->spec.userdata,
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375 (Uint8 *) audio->convert.buf,
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diff changeset
376 audio->convert.len);
0
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diff changeset
377 SDL_ConvertAudio(&audio->convert);
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378 #if 0
1895
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379 if (audio->convert.len_cvt != audio->spec.size) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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380 /* Uh oh... probably crashes here */ ;
0
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381 }
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382 #endif
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
383 SDL_memcpy(newbuf->dbSoundData, audio->convert.buf,
1895
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diff changeset
384 audio->convert.len_cvt);
0
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385 } else {
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diff changeset
386 audio->spec.callback(audio->spec.userdata,
1895
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387 (Uint8 *) newbuf->dbSoundData,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
388 audio->spec.size);
0
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diff changeset
389 }
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390 }
1895
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391 newbuf->dbFlags |= dbBufferReady;
0
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diff changeset
392 }
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diff changeset
393
1895
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394 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
395 DoubleBufferAudio_Available(void)
0
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diff changeset
396 {
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diff changeset
397 int available;
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diff changeset
398 NumVersion sndversion;
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diff changeset
399 long response;
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parents:
diff changeset
400
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diff changeset
401 available = 0;
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diff changeset
402 sndversion = SndSoundManagerVersion();
1895
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403 if (sndversion.majorRev >= 3) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
404 if (Gestalt(gestaltSoundAttr, &response) == noErr) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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405 if ((response & (1 << gestaltSndPlayDoubleBuffer))) {
0
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diff changeset
406 available = 1;
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parents:
diff changeset
407 }
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parents:
diff changeset
408 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
409 } else {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
410 if (Gestalt(gestaltSoundAttr, &response) == noErr) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
411 if ((response & (1 << gestaltHasASC))) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
412 available = 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
413 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
414 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
415 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
416 return (available);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
417 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
418
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
419 static void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
420 Mac_CloseAudio(_THIS)
0
74212992fb08 Initial revision
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parents:
diff changeset
421 {
74212992fb08 Initial revision
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diff changeset
422 int i;
74212992fb08 Initial revision
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parents:
diff changeset
423
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
424 if (channel != NULL) {
0
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parents:
diff changeset
425 /* Clean up the audio channel */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
426 SndDisposeChannel(channel, true);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
427 channel = NULL;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
428 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
429 for (i = 0; i < 2; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
430 if (audio_buf[i]) {
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
431 SDL_free(audio_buf[i]);
0
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parents:
diff changeset
432 audio_buf[i] = NULL;
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parents:
diff changeset
433 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
434 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
435 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
436
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
437 static int
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
438 Mac_OpenAudio(_THIS, SDL_AudioSpec * spec)
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
439 {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
440 SndDoubleBufferHeader2 audio_dbh;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
441 int i;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
442 long initOptions;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
443 int sample_bits;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
444 SndDoubleBackUPP doubleBackProc;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
445
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parents:
diff changeset
446 /* Check to make sure double-buffered audio is available */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
447 if (!DoubleBufferAudio_Available()) {
0
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parents:
diff changeset
448 SDL_SetError("Sound manager doesn't support double-buffering");
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
449 return (-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
450 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
451
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parents:
diff changeset
452 /* Very few conversions are required, but... */
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parents:
diff changeset
453 switch (spec->format) {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
454 case AUDIO_S8:
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
455 spec->format = AUDIO_U8;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
456 break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
457 case AUDIO_U16LSB:
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
458 spec->format = AUDIO_S16LSB;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
459 break;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
460 case AUDIO_U16MSB:
0
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parents:
diff changeset
461 spec->format = AUDIO_S16MSB;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
462 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
463 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
464 SDL_CalculateAudioSpec(spec);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
465
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
466 /* initialize the double-back header */
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
467 SDL_memset(&audio_dbh, 0, sizeof(audio_dbh));
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
468 doubleBackProc = NewSndDoubleBackProc(sndDoubleBackProc);
0
74212992fb08 Initial revision
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parents:
diff changeset
469 sample_bits = spec->size / spec->samples / spec->channels * 8;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
470
0
74212992fb08 Initial revision
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parents:
diff changeset
471 audio_dbh.dbhNumChannels = spec->channels;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
472 audio_dbh.dbhSampleSize = sample_bits;
0
74212992fb08 Initial revision
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parents:
diff changeset
473 audio_dbh.dbhCompressionID = 0;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
474 audio_dbh.dbhPacketSize = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
475 audio_dbh.dbhSampleRate = spec->freq << 16;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
476 audio_dbh.dbhDoubleBack = doubleBackProc;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
477 audio_dbh.dbhFormat = 0;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
478
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
479 /* Note that we install the 16bitLittleEndian Converter if needed. */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
480 if (spec->format == 0x8010) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
481 audio_dbh.dbhCompressionID = fixedCompression;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
482 audio_dbh.dbhFormat = k16BitLittleEndianFormat;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
483 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
484
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
485 /* allocate the 2 double-back buffers */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
486 for (i = 0; i < 2; ++i) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
487 audio_buf[i] = SDL_calloc(1, sizeof(SndDoubleBuffer) + spec->size);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
488 if (audio_buf[i] == NULL) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
489 SDL_OutOfMemory();
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
490 return (-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
491 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
492 audio_buf[i]->dbNumFrames = spec->samples;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
493 audio_buf[i]->dbFlags = dbBufferReady;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
494 audio_buf[i]->dbUserInfo[0] = (long) this;
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
495 audio_dbh.dbhBufferPtr[i] = audio_buf[i];
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
496 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
497
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
498 /* Create the sound manager channel */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
499 channel = (SndChannelPtr) SDL_malloc(sizeof(*channel));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
500 if (channel == NULL) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
501 SDL_OutOfMemory();
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
502 return (-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
503 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
504 if (spec->channels >= 2) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
505 initOptions = initStereo;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
506 } else {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
507 initOptions = initMono;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
508 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
509 channel->userInfo = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
510 channel->qLength = 128;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
511 if (SndNewChannel(&channel, sampledSynth, initOptions, 0L) != noErr) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
512 SDL_SetError("Unable to create audio channel");
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents: 1312
diff changeset
513 SDL_free(channel);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
514 channel = NULL;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
515 return (-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
516 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
517
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
518 /* Start playback */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
519 if (SndPlayDoubleBuffer(channel, (SndDoubleBufferHeaderPtr) & audio_dbh)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
520 != noErr) {
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
521 SDL_SetError("Unable to play double buffered audio");
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
522 return (-1);
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
523 }
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
524
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
525 return 1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
526 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
527
323
b7e8038e40ae The audio lock and unlock functions are now a part of the driver.
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
528 #endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1621
diff changeset
529 /* vi: set ts=4 sw=4 expandtab: */