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annotate src/audio/amigaos/SDL_ahiaudio.c @ 1956:ba0d62354872

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Simplified driver window creation code. Implemented several Cocoa window functions
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Jul 2006 21:51:00 +0000
parents c121d94672cb
children f25d771fe6f2
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 /* Allow access to a raw mixing buffer (for AmigaOS) */
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25
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26 #include "SDL_audio.h"
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27 #include "../SDL_audio_c.h"
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28 #include "SDL_ahiaudio.h"
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29
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30 /* Audio driver functions */
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31 static int AHI_OpenAudio(_THIS, SDL_AudioSpec * spec);
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32 static void AHI_WaitAudio(_THIS);
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33 static void AHI_PlayAudio(_THIS);
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34 static Uint8 *AHI_GetAudioBuf(_THIS);
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35 static void AHI_CloseAudio(_THIS);
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36
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37 #ifndef __SASC
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38 #define mymalloc(x) AllocVec(x,MEMF_PUBLIC)
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39 #define myfree FreeVec
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40 #else
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41 #define mymalloc malloc
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42 #define myfree free
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43 #endif
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44
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45 /* Audio driver bootstrap functions */
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46
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47 static int
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48 Audio_Available(void)
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49 {
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50 int ok = 0;
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51 struct MsgPort *p;
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52 struct AHIRequest *req;
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53
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54 if (p = CreateMsgPort()) {
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55 if (req =
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56 (struct AHIRequest *) CreateIORequest(p,
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57 sizeof(struct
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58 AHIRequest))) {
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59 req->ahir_Version = 4;
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60
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61 if (!OpenDevice(AHINAME, 0, (struct IORequest *) req, NULL)) {
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62 D(bug("AHI available.\n"));
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63 ok = 1;
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64 CloseDevice((struct IORequest *) req);
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65 }
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66 DeleteIORequest((struct IORequest *) req);
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67 }
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68 DeleteMsgPort(p);
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69 }
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70
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71 D(if (!ok) bug("AHI not available\n"));
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72 return ok;
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73 }
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74
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75 static void
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76 Audio_DeleteDevice(SDL_AudioDevice * device)
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77 {
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78 SDL_free(device->hidden);
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79 SDL_free(device);
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80 }
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81
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82 static SDL_AudioDevice *
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83 Audio_CreateDevice(int devindex)
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84 {
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85 SDL_AudioDevice *this;
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86
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87 #ifndef NO_AMIGADEBUG
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88 D(bug("AHI created...\n"));
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89 #endif
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90
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91 /* Initialize all variables that we clean on shutdown */
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92 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
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93 if (this) {
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94 SDL_memset(this, 0, (sizeof *this));
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95 this->hidden = (struct SDL_PrivateAudioData *)
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96 SDL_malloc((sizeof *this->hidden));
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97 }
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98 if ((this == NULL) || (this->hidden == NULL)) {
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99 SDL_OutOfMemory();
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100 if (this) {
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101 SDL_free(this);
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102 }
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103 return (0);
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104 }
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105 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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106
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107 /* Set the function pointers */
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108 this->OpenAudio = AHI_OpenAudio;
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109 this->WaitAudio = AHI_WaitAudio;
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110 this->PlayAudio = AHI_PlayAudio;
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111 this->GetAudioBuf = AHI_GetAudioBuf;
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112 this->CloseAudio = AHI_CloseAudio;
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113
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114 this->free = Audio_DeleteDevice;
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115
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116 return this;
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117 }
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118
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119 AudioBootStrap AHI_bootstrap = {
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120 "AHI", Audio_Available, Audio_CreateDevice
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121 };
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122
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123
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124 void static
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125 AHI_WaitAudio(_THIS)
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126 {
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127 if (!CheckIO((struct IORequest *) audio_req[current_buffer])) {
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128 WaitIO((struct IORequest *) audio_req[current_buffer]);
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129 // AbortIO((struct IORequest *)audio_req[current_buffer]);
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130 }
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131 }
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132
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133 static void
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134 AHI_PlayAudio(_THIS)
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135 {
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136 if (playing > 1)
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137 WaitIO((struct IORequest *) audio_req[current_buffer]);
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138
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139 /* Write the audio data out */
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140 audio_req[current_buffer]->ahir_Std.io_Message.mn_Node.ln_Pri = 60;
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141 audio_req[current_buffer]->ahir_Std.io_Data = mixbuf[current_buffer];
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142 audio_req[current_buffer]->ahir_Std.io_Length = this->hidden->size;
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143 audio_req[current_buffer]->ahir_Std.io_Offset = 0;
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144 audio_req[current_buffer]->ahir_Std.io_Command = CMD_WRITE;
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145 audio_req[current_buffer]->ahir_Frequency = this->hidden->freq;
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146 audio_req[current_buffer]->ahir_Volume = 0x10000;
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147 audio_req[current_buffer]->ahir_Type = this->hidden->type;
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148 audio_req[current_buffer]->ahir_Position = 0x8000;
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149 audio_req[current_buffer]->ahir_Link =
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150 (playing > 0 ? audio_req[current_buffer ^ 1] : NULL);
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151
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152 SendIO((struct IORequest *) audio_req[current_buffer]);
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153 current_buffer ^= 1;
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154
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155 playing++;
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156 }
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157
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158 static Uint8 *
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159 AHI_GetAudioBuf(_THIS)
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160 {
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161 return (mixbuf[current_buffer]);
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162 }
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163
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164 static void
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165 AHI_CloseAudio(_THIS)
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166 {
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167 D(bug("Closing audio...\n"));
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168
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169 playing = 0;
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170
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171 if (audio_req[0]) {
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172 if (audio_req[1]) {
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173 D(bug("Break req[1]...\n"));
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174
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175 AbortIO((struct IORequest *) audio_req[1]);
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176 WaitIO((struct IORequest *) audio_req[1]);
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177 }
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178
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179 D(bug("Break req[0]...\n"));
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180
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181 AbortIO((struct IORequest *) audio_req[0]);
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182 WaitIO((struct IORequest *) audio_req[0]);
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183
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184 if (audio_req[1]) {
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185 D(bug("Break AGAIN req[1]...\n"));
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186 AbortIO((struct IORequest *) audio_req[1]);
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187 WaitIO((struct IORequest *) audio_req[1]);
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188 }
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189 // Double abort to be sure to break the dbuffering process.
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190
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191 SDL_Delay(200);
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192
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193 D(bug("Reqs breaked, closing device...\n"));
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194 CloseDevice((struct IORequest *) audio_req[0]);
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195 D(bug("Device closed, freeing memory...\n"));
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196 myfree(audio_req[1]);
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197 D(bug("Memory freed, deleting IOReq...\n"));
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198 DeleteIORequest((struct IORequest *) audio_req[0]);
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199 audio_req[0] = audio_req[1] = NULL;
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200 }
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201
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202 D(bug("Freeing mixbuf[0]...\n"));
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203 if (mixbuf[0] != NULL) {
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204 myfree(mixbuf[0]);
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205 // SDL_FreeAudioMem(mixbuf[0]);
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206 mixbuf[0] = NULL;
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207 }
21
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208
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209 D(bug("Freeing mixbuf[1]...\n"));
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210 if (mixbuf[1] != NULL) {
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211 myfree(mixbuf[1]);
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212 // SDL_FreeAudioMem(mixbuf[1]);
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213 mixbuf[1] = NULL;
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214 }
21
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diff changeset
215
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216 D(bug("Freeing audio_port...\n"));
21
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217
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218 if (audio_port != NULL) {
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219 DeleteMsgPort(audio_port);
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220 audio_port = NULL;
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221 }
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222 D(bug("...done!\n"));
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223 }
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224
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225 static int
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226 AHI_OpenAudio(_THIS, SDL_AudioSpec * spec)
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227 {
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228 // int width;
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229
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230 D(bug("AHI opening...\n"));
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231
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232 /* Determine the audio parameters from the AudioSpec */
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233 switch (spec->format & 0xFF) {
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234
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235 case 8:
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236 { /* Signed 8 bit audio data */
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237 D(bug("Samples a 8 bit...\n"));
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238 spec->format = AUDIO_S8;
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239 this->hidden->bytespersample = 1;
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240 if (spec->channels < 2)
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241 this->hidden->type = AHIST_M8S;
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242 else
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243 this->hidden->type = AHIST_S8S;
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244 }
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245 break;
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246
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247 case 16:
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248 { /* Signed 16 bit audio data */
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249 D(bug("Samples a 16 bit...\n"));
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250 spec->format = AUDIO_S16MSB;
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251 this->hidden->bytespersample = 2;
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252 if (spec->channels < 2)
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253 this->hidden->type = AHIST_M16S;
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254 else
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255 this->hidden->type = AHIST_S16S;
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256 }
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257 break;
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258
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259 default:
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260 {
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261 SDL_SetError("Unsupported audio format");
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262 return (-1);
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263 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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264 }
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265
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266 if (spec->channels != 1 && spec->channels != 2) {
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267 D(bug("Wrong channel number!\n"));
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268 SDL_SetError("Channel number non supported");
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269 return -1;
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270 }
21
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271
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272 D(bug("Before CalculateAudioSpec\n"));
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273 /* Update the fragment size as size in bytes */
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274 SDL_CalculateAudioSpec(spec);
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275
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276 D(bug("Before CreateMsgPort\n"));
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277
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278 if (!(audio_port = CreateMsgPort())) {
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279 SDL_SetError("Unable to create a MsgPort");
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280 return -1;
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281 }
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282
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283 D(bug("Before CreateIORequest\n"));
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284
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285 if (!
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286 (audio_req[0] =
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287 (struct AHIRequest *) CreateIORequest(audio_port,
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288 sizeof(struct AHIRequest)))) {
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289 SDL_SetError("Unable to create an AHIRequest");
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290 DeleteMsgPort(audio_port);
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291 return -1;
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292 }
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293
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294 audio_req[0]->ahir_Version = 4;
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295
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296 if (OpenDevice(AHINAME, 0, (struct IORequest *) audio_req[0], NULL)) {
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297 SDL_SetError("Unable to open AHI device!\n");
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298 DeleteIORequest((struct IORequest *) audio_req[0]);
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299 DeleteMsgPort(audio_port);
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300 return -1;
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301 }
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302
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303 D(bug("AFTER opendevice\n"));
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304
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305 /* Set output frequency and size */
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306 this->hidden->freq = spec->freq;
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307 this->hidden->size = spec->size;
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308
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309 D(bug("Before buffer allocation\n"));
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310
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311 /* Allocate mixing buffer */
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312 mixbuf[0] = (Uint8 *) mymalloc(spec->size);
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313 mixbuf[1] = (Uint8 *) mymalloc(spec->size);
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314
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315 D(bug("Before audio_req allocation\n"));
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316
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317 if (!(audio_req[1] = mymalloc(sizeof(struct AHIRequest)))) {
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318 SDL_OutOfMemory();
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319 return (-1);
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320 }
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321
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322 D(bug("Before audio_req memcpy\n"));
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323
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324 SDL_memcpy(audio_req[1], audio_req[0], sizeof(struct AHIRequest));
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325
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326 if (mixbuf[0] == NULL || mixbuf[1] == NULL) {
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327 SDL_OutOfMemory();
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328 return (-1);
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329 }
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330
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331 D(bug("Before mixbuf memset\n"));
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332
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333 SDL_memset(mixbuf[0], spec->silence, spec->size);
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334 SDL_memset(mixbuf[1], spec->silence, spec->size);
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335
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336 current_buffer = 0;
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337 playing = 0;
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338
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339 D(bug
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340 ("AHI opened: freq:%ld mixbuf:%lx/%lx buflen:%ld bits:%ld channels:%ld\n",
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341 spec->freq, mixbuf[0], mixbuf[1], spec->size,
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342 this->hidden->bytespersample * 8, spec->channels));
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343
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344 /* We're ready to rock and roll. :-) */
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345 return (0);
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346 }
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347
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348 /* vi: set ts=4 sw=4 expandtab: */