Mercurial > sdl-ios-xcode

annotate src/audio/amigaos/SDL_ahiaudio.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
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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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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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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 }
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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 }
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215
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216 D(bug("Freeing audio_port...\n"));
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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 }
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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 }
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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: */