Mercurial > sdl-ios-xcode
annotate src/audio/dmedia/SDL_irixaudio.c @ 1616:9f836cec0521
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 31 Mar 2006 06:30:16 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb 405a192b68e7 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ | |
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25 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
| 0 | 26 |
| 27 #include "SDL_timer.h" | |
| 28 #include "SDL_audio.h" | |
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29 #include "../SDL_audiomem.h" |
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30 #include "../SDL_audio_c.h" |
| 0 | 31 #include "SDL_irixaudio.h" |
| 32 | |
| 33 | |
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34 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
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35 #define OLD_IRIX_AUDIO |
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36 #define alClosePort(x) ALcloseport(x) |
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37 #define alFreeConfig(x) ALfreeconfig(x) |
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38 #define alGetFillable(x) ALgetfillable(x) |
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39 #define alNewConfig() ALnewconfig() |
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40 #define alOpenPort(x,y,z) ALopenport(x,y,z) |
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41 #define alSetChannels(x,y) ALsetchannels(x,y) |
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42 #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
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43 #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
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44 #define alSetWidth(x,y) ALsetwidth(x,y) |
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45 #endif |
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46 |
| 0 | 47 /* Audio driver functions */ |
| 48 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 49 static void AL_WaitAudio(_THIS); | |
| 50 static void AL_PlayAudio(_THIS); | |
| 51 static Uint8 *AL_GetAudioBuf(_THIS); | |
| 52 static void AL_CloseAudio(_THIS); | |
| 53 | |
| 54 /* Audio driver bootstrap functions */ | |
| 55 | |
| 56 static int Audio_Available(void) | |
| 57 { | |
| 58 return 1; | |
| 59 } | |
| 60 | |
| 61 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 62 { | |
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63 SDL_free(device->hidden); |
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64 SDL_free(device); |
| 0 | 65 } |
| 66 | |
| 67 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 68 { | |
| 69 SDL_AudioDevice *this; | |
| 70 | |
| 71 /* Initialize all variables that we clean on shutdown */ | |
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72 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 73 if ( this ) { |
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74 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 75 this->hidden = (struct SDL_PrivateAudioData *) |
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76 SDL_malloc((sizeof *this->hidden)); |
| 0 | 77 } |
| 78 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 79 SDL_OutOfMemory(); | |
| 80 if ( this ) { | |
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81 SDL_free(this); |
| 0 | 82 } |
| 83 return(0); | |
| 84 } | |
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85 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 86 |
| 87 /* Set the function pointers */ | |
| 88 this->OpenAudio = AL_OpenAudio; | |
| 89 this->WaitAudio = AL_WaitAudio; | |
| 90 this->PlayAudio = AL_PlayAudio; | |
| 91 this->GetAudioBuf = AL_GetAudioBuf; | |
| 92 this->CloseAudio = AL_CloseAudio; | |
| 93 | |
| 94 this->free = Audio_DeleteDevice; | |
| 95 | |
| 96 return this; | |
| 97 } | |
| 98 | |
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99 AudioBootStrap DMEDIA_bootstrap = { |
| 0 | 100 "AL", "IRIX DMedia audio", |
| 101 Audio_Available, Audio_CreateDevice | |
| 102 }; | |
| 103 | |
| 104 | |
| 105 void static AL_WaitAudio(_THIS) | |
| 106 { | |
| 107 Sint32 timeleft; | |
| 108 | |
| 109 timeleft = this->spec.samples - alGetFillable(audio_port); | |
| 110 if ( timeleft > 0 ) { | |
| 111 timeleft /= (this->spec.freq/1000); | |
| 112 SDL_Delay((Uint32)timeleft); | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 static void AL_PlayAudio(_THIS) | |
| 117 { | |
| 118 /* Write the audio data out */ | |
| 119 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { | |
| 120 /* Assume fatal error, for now */ | |
| 121 this->enabled = 0; | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 static Uint8 *AL_GetAudioBuf(_THIS) | |
| 126 { | |
| 127 return(mixbuf); | |
| 128 } | |
| 129 | |
| 130 static void AL_CloseAudio(_THIS) | |
| 131 { | |
| 132 if ( mixbuf != NULL ) { | |
| 133 SDL_FreeAudioMem(mixbuf); | |
| 134 mixbuf = NULL; | |
| 135 } | |
| 136 if ( audio_port != NULL ) { | |
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137 alClosePort(audio_port); |
| 0 | 138 audio_port = NULL; |
| 139 } | |
| 140 } | |
| 141 | |
| 142 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 143 { | |
| 144 ALconfig audio_config; | |
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145 #ifdef OLD_IRIX_AUDIO |
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146 long audio_param[2]; |
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147 #else |
| 0 | 148 ALpv audio_param; |
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149 #endif |
| 0 | 150 int width; |
| 151 | |
| 152 /* Determine the audio parameters from the AudioSpec */ | |
| 153 switch ( spec->format & 0xFF ) { | |
| 154 | |
| 155 case 8: { /* Signed 8 bit audio data */ | |
| 156 spec->format = AUDIO_S8; | |
| 157 width = AL_SAMPLE_8; | |
| 158 } | |
| 159 break; | |
| 160 | |
| 161 case 16: { /* Signed 16 bit audio data */ | |
| 162 spec->format = AUDIO_S16MSB; | |
| 163 width = AL_SAMPLE_16; | |
| 164 } | |
| 165 break; | |
| 166 | |
| 167 default: { | |
| 168 SDL_SetError("Unsupported audio format"); | |
| 169 return(-1); | |
| 170 } | |
| 171 } | |
| 172 | |
| 173 /* Update the fragment size as size in bytes */ | |
| 174 SDL_CalculateAudioSpec(spec); | |
| 175 | |
| 176 /* Set output frequency */ | |
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177 #ifdef OLD_IRIX_AUDIO |
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178 audio_param[0] = AL_OUTPUT_RATE; |
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179 audio_param[1] = spec->freq; |
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180 if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) { |
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181 #else |
| 0 | 182 audio_param.param = AL_RATE; |
| 183 audio_param.value.i = spec->freq; | |
| 184 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) { | |
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185 #endif |
| 0 | 186 SDL_SetError("alSetParams failed"); |
| 187 return(-1); | |
| 188 } | |
| 189 | |
| 190 /* Open the audio port with the requested frequency */ | |
| 191 audio_port = NULL; | |
| 192 audio_config = alNewConfig(); | |
| 193 if ( audio_config && | |
| 194 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) && | |
| 195 (alSetWidth(audio_config, width) >= 0) && | |
| 196 (alSetQueueSize(audio_config, spec->samples*2) >= 0) && | |
| 197 (alSetChannels(audio_config, spec->channels) >= 0) ) { | |
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198 audio_port = alOpenPort("SDL audio", "w", audio_config); |
| 0 | 199 } |
| 200 alFreeConfig(audio_config); | |
| 201 if( audio_port == NULL ) { | |
| 202 SDL_SetError("Unable to open audio port"); | |
| 203 return(-1); | |
| 204 } | |
| 205 | |
| 206 /* Allocate mixing buffer */ | |
| 207 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size); | |
| 208 if ( mixbuf == NULL ) { | |
| 209 SDL_OutOfMemory(); | |
| 210 return(-1); | |
| 211 } | |
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212 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 213 |
| 214 /* We're ready to rock and roll. :-) */ | |
| 215 return(0); | |
| 216 } |