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annotate src/audio/macrom/SDL_romaudio.c @ 2690:ca01c20274c0 gsoc2008_nds

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More work and some bugfixes on the graphics driver.
author Darren Alton <dalton@stevens.edu>
date Sat, 16 Aug 2008 07:44:35 +0000
parents 866052b01ee5
children 79c1bd651f04
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 /* This should work on PowerPC and Intel Mac OS X, and Carbonized Mac OS 9. */
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25
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26 #if defined(__APPLE__) && defined(__MACH__)
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27 # define SDL_MACOS_NAME "Mac OS X"
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28 # include <Carbon/Carbon.h>
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29 #elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335)
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30 # define SDL_MACOS_NAME "Mac OS 9"
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31 # include <Carbon.h>
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32 #else
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33 # define SDL_MACOS_NAME "Mac OS 9"
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34 # include <Sound.h> /* SoundManager interface */
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35 # include <Gestalt.h>
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36 # include <DriverServices.h>
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37 #endif
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38
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39 #if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335)
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40 #if !defined(NewSndCallBackProc) /* avoid circular redefinition... */
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41 #define NewSndCallBackUPP NewSndCallBackProc
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42 #endif
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43 #if !defined(NewSndCallBackUPP)
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44 #define NewSndCallBackUPP NewSndCallBackProc
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45 #endif
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46 #endif
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47
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48 #include "SDL_audio.h"
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49 #include "../SDL_audio_c.h"
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50 #include "../SDL_sysaudio.h"
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51 #include "SDL_romaudio.h"
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52
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53 #pragma options align=power
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54
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55 static volatile SInt32 audio_is_locked = 0;
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56 static volatile SInt32 need_to_mix = 0;
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57
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58 static UInt8 *buffer[2];
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59 static volatile UInt32 running = 0;
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60 static CmpSoundHeader header;
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61 static volatile Uint32 fill_me = 0;
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62
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63
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64 static void
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65 mix_buffer(SDL_AudioDevice * audio, UInt8 * buffer)
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66 {
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67 if (!audio->paused) {
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68 #ifdef __MACOSX__
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69 SDL_mutexP(audio->mixer_lock);
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70 #endif
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71 if (audio->convert.needed) {
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72 audio->spec.callback(audio->spec.userdata,
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73 (Uint8 *) audio->convert.buf,
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74 audio->convert.len);
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75 SDL_ConvertAudio(&audio->convert);
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76 if (audio->convert.len_cvt != audio->spec.size) {
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77 /* Uh oh... probably crashes here */ ;
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78 }
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79 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt);
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80 } else {
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81 audio->spec.callback(audio->spec.userdata, buffer,
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82 audio->spec.size);
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83 }
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84 #ifdef __MACOSX__
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85 SDL_mutexV(audio->mixer_lock);
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86 #endif
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87 }
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88
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89 DecrementAtomic((SInt32 *) & need_to_mix);
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90 }
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91
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92 static void
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93 SNDMGR_LockDevice(_THIS)
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94 {
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95 IncrementAtomic((SInt32 *) & audio_is_locked);
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96 }
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97
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98 static void
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99 SNDMGR_UnlockDevice(_THIS)
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100 {
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101 SInt32 oldval;
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102
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103 oldval = DecrementAtomic((SInt32 *) & audio_is_locked);
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104 if (oldval != 1) /* != 1 means audio is still locked. */
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105 return;
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106
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107 /* Did we miss the chance to mix in an interrupt? Do it now. */
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108 if (BitAndAtomic(0xFFFFFFFF, (UInt32 *) & need_to_mix)) {
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109 /*
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110 * Note that this could be a problem if you missed an interrupt
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111 * while the audio was locked, and get preempted by a second
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112 * interrupt here, but that means you locked for way too long anyhow.
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113 */
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114 mix_buffer(this, buffer[fill_me]);
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115 }
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116 }
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117
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118 static void
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119 callBackProc(SndChannel * chan, SndCommand * cmd_passed)
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120 {
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121 UInt32 play_me;
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122 SndCommand cmd;
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123 SDL_AudioDevice *audio = (SDL_AudioDevice *) chan->userInfo;
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124
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125 IncrementAtomic((SInt32 *) & need_to_mix);
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126
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127 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */
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128 play_me = !fill_me; /* filled buffer to play _now_ */
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129
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130 if (!audio->enabled) {
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131 return;
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132 }
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133
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134 /* queue previously mixed buffer for playback. */
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135 header.samplePtr = (Ptr) buffer[play_me];
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136 cmd.cmd = bufferCmd;
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137 cmd.param1 = 0;
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138 cmd.param2 = (long) &header;
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139 SndDoCommand(chan, &cmd, 0);
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140
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141 SDL_memset(buffer[fill_me], 0, audio->spec.size);
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142
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143 /*
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144 * if audio device isn't locked, mix the next buffer to be queued in
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145 * the memory block that just finished playing.
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146 */
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147 if (!BitAndAtomic(0xFFFFFFFF, (UInt32 *) & audio_is_locked)) {
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148 mix_buffer(audio, buffer[fill_me]);
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149 }
323
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150
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151 /* set this callback to run again when current buffer drains. */
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152 if (running) {
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153 cmd.cmd = callBackCmd;
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154 cmd.param1 = 0;
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155 cmd.param2 = play_me;
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156
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157 SndDoCommand(chan, &cmd, 0);
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158 }
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159 }
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160
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161 static void
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162 SNDMGR_CloseDevice(_THIS)
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163 {
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164 running = 0;
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165
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166 if (this->hidden != NULL) {
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167 if (this->hidden->channel) {
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168 SndDisposeChannel(this->hidden->channel, true);
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169 this->hidden->channel = NULL;
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170 }
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171
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172 SDL_free(buffer[0]);
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173 SDL_free(buffer[1]);
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174 buffer[0] = buffer[1] = NULL;
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175
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176 SDL_free(this->hidden);
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177 this->hidden = NULL;
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178 }
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179 }
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180
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181 static int
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182 SNDMGR_OpenDevice(_THIS, const char *devname, int iscapture)
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183 {
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184 SDL_AudioSpec *spec = &this->spec;
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185 SndChannelPtr channel = NULL;
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186 SndCallBackUPP callback;
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187 int sample_bits;
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188 int i;
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189 long initOptions;
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190
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191 /* Initialize all variables that we clean on shutdown */
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192 this->hidden = (struct SDL_PrivateAudioData *)
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193 SDL_malloc((sizeof *this->hidden));
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194 if (this->hidden == NULL) {
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195 SDL_OutOfMemory();
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196 return 0;
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197 }
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198 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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199
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diff changeset
200 /* !!! FIXME: iterate through format matrix... */
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201 /* Very few conversions are required, but... */
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202 switch (spec->format) {
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203 case AUDIO_S8:
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204 spec->format = AUDIO_U8;
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205 break;
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206 case AUDIO_U16LSB:
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207 spec->format = AUDIO_S16LSB;
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208 break;
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209 case AUDIO_U16MSB:
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210 spec->format = AUDIO_S16MSB;
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211 break;
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diff changeset
212 case AUDIO_F32LSB:
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213 spec->format = AUDIO_F32MSB;
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diff changeset
214 break;
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215 }
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diff changeset
216 SDL_CalculateAudioSpec(&this->spec);
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217
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218 /* initialize bufferCmd header */
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diff changeset
219 SDL_memset(&header, 0, sizeof(header));
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220 callback = (SndCallBackUPP) NewSndCallBackUPP(callBackProc);
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221 sample_bits = spec->size / spec->samples / spec->channels * 8;
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diff changeset
222
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223 #ifdef DEBUG_AUDIO
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diff changeset
224 fprintf(stderr,
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225 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n",
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226 spec->format, spec->channels, sample_bits, spec->freq);
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227 #endif /* DEBUG_AUDIO */
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228
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229 header.numChannels = spec->channels;
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230 header.sampleSize = sample_bits;
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231 header.sampleRate = spec->freq << 16;
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diff changeset
232 header.numFrames = spec->samples;
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diff changeset
233 header.encode = cmpSH;
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diff changeset
234
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235 /* Note that we install the 16bitLittleEndian Converter if needed. */
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diff changeset
236 if (spec->format == AUDIO_S16LSB) {
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diff changeset
237 header.compressionID = fixedCompression;
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238 header.format = k16BitLittleEndianFormat;
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diff changeset
239 } else if (spec->format == AUDIO_S32MSB) {
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diff changeset
240 header.compressionID = fixedCompression;
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diff changeset
241 header.format = k32BitFormat;
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diff changeset
242 } else if (spec->format == AUDIO_S32LSB) {
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diff changeset
243 header.compressionID = fixedCompression;
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244 header.format = k32BitLittleEndianFormat;
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diff changeset
245 } else if (spec->format == AUDIO_F32MSB) {
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diff changeset
246 header.compressionID = fixedCompression;
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diff changeset
247 header.format = kFloat32Format;
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248 }
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249
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250 /* allocate 2 buffers */
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251 for (i = 0; i < 2; i++) {
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diff changeset
252 buffer[i] = (UInt8 *) SDL_malloc(sizeof(UInt8) * spec->size);
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253 if (buffer[i] == NULL) {
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diff changeset
254 SNDMGR_CloseDevice(this);
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255 SDL_OutOfMemory();
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diff changeset
256 return 0;
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257 }
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diff changeset
258 SDL_memset(buffer[i], 0, spec->size);
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259 }
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260
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261 /* Create the sound manager channel */
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diff changeset
262 channel = (SndChannelPtr) SDL_malloc(sizeof(*channel));
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diff changeset
263 if (channel == NULL) {
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264 SNDMGR_CloseDevice(this);
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265 SDL_OutOfMemory();
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266 return 0;
0
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267 }
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268 this->hidden->channel = channel;
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269 if (spec->channels >= 2) {
0
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270 initOptions = initStereo;
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271 } else {
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272 initOptions = initMono;
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273 }
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274 channel->userInfo = (long) this;
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275 channel->qLength = 128;
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276 if (SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr) {
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277 SNDMGR_CloseDevice(this);
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278 SDL_SetError("Unable to create audio channel");
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279 return 0;
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280 }
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281
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282 /* start playback */
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283 {
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284 SndCommand cmd;
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285 cmd.cmd = callBackCmd;
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286 cmd.param2 = 0;
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287 running = 1;
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288 SndDoCommand(channel, &cmd, 0);
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289 }
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290
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291 return 1;
0
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292 }
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293
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294 static int
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295 SNDMGR_Init(SDL_AudioDriverImpl * impl)
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296 {
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297 /* Set the function pointers */
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298 impl->OpenDevice = SNDMGR_OpenDevice;
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299 impl->CloseDevice = SNDMGR_CloseDevice;
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300 impl->ProvidesOwnCallbackThread = 1;
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301 impl->OnlyHasDefaultOutputDevice = 1;
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302
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303 /* Mac OS X uses threaded audio, so normal thread code is okay */
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304 #ifndef __MACOSX__
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305 impl->LockDevice = SNDMGR_LockDevice;
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306 impl->UnlockDevice = SNDMGR_UnlockDevice;
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307 impl->SkipMixerLock = 1;
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308 #endif
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309
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310 return 1;
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311 }
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312
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313 AudioBootStrap SNDMGR_bootstrap = {
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314 "sndmgr", SDL_MACOS_NAME " SoundManager", SNDMGR_Init, 0
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315 };
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316
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317 /* vi: set ts=4 sw=4 expandtab: */