Mercurial > sdl-ios-xcode
annotate src/audio/dmedia/SDL_irixaudio.c @ 1011:4095d9ca23f2
*** empty log message ***
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 13 Dec 2004 08:49:17 +0000 |
| parents | 6e6248801043 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 5635-34 Springhouse Dr. | |
| 21 Pleasanton, CA 94588 (USA) | |
|
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22 slouken@libsdl.org |
| 0 | 23 */ |
| 24 | |
| 25 #ifdef SAVE_RCSID | |
| 26 static char rcsid = | |
| 27 "@(#) $Id$"; | |
| 28 #endif | |
| 29 | |
| 30 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ | |
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31 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
| 0 | 32 |
| 33 #include <stdlib.h> | |
| 34 | |
| 35 #include "SDL_endian.h" | |
| 36 #include "SDL_timer.h" | |
| 37 #include "SDL_audio.h" | |
| 38 #include "SDL_audiomem.h" | |
| 39 #include "SDL_audio_c.h" | |
| 40 #include "SDL_irixaudio.h" | |
| 41 | |
| 42 | |
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43 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
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44 #define OLD_IRIX_AUDIO |
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45 #define alClosePort(x) ALcloseport(x) |
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46 #define alFreeConfig(x) ALfreeconfig(x) |
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47 #define alGetFillable(x) ALgetfillable(x) |
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48 #define alNewConfig() ALnewconfig() |
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49 #define alOpenPort(x,y,z) ALopenport(x,y,z) |
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50 #define alSetChannels(x,y) ALsetchannels(x,y) |
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51 #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
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52 #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
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53 #define alSetWidth(x,y) ALsetwidth(x,y) |
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54 #endif |
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55 |
| 0 | 56 /* Audio driver functions */ |
| 57 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 58 static void AL_WaitAudio(_THIS); | |
| 59 static void AL_PlayAudio(_THIS); | |
| 60 static Uint8 *AL_GetAudioBuf(_THIS); | |
| 61 static void AL_CloseAudio(_THIS); | |
| 62 | |
| 63 /* Audio driver bootstrap functions */ | |
| 64 | |
| 65 static int Audio_Available(void) | |
| 66 { | |
| 67 return 1; | |
| 68 } | |
| 69 | |
| 70 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 71 { | |
| 72 free(device->hidden); | |
| 73 free(device); | |
| 74 } | |
| 75 | |
| 76 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 77 { | |
| 78 SDL_AudioDevice *this; | |
| 79 | |
| 80 /* Initialize all variables that we clean on shutdown */ | |
| 81 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 82 if ( this ) { | |
| 83 memset(this, 0, (sizeof *this)); | |
| 84 this->hidden = (struct SDL_PrivateAudioData *) | |
| 85 malloc((sizeof *this->hidden)); | |
| 86 } | |
| 87 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 88 SDL_OutOfMemory(); | |
| 89 if ( this ) { | |
| 90 free(this); | |
| 91 } | |
| 92 return(0); | |
| 93 } | |
| 94 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 95 | |
| 96 /* Set the function pointers */ | |
| 97 this->OpenAudio = AL_OpenAudio; | |
| 98 this->WaitAudio = AL_WaitAudio; | |
| 99 this->PlayAudio = AL_PlayAudio; | |
| 100 this->GetAudioBuf = AL_GetAudioBuf; | |
| 101 this->CloseAudio = AL_CloseAudio; | |
| 102 | |
| 103 this->free = Audio_DeleteDevice; | |
| 104 | |
| 105 return this; | |
| 106 } | |
| 107 | |
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108 AudioBootStrap DMEDIA_bootstrap = { |
| 0 | 109 "AL", "IRIX DMedia audio", |
| 110 Audio_Available, Audio_CreateDevice | |
| 111 }; | |
| 112 | |
| 113 | |
| 114 void static AL_WaitAudio(_THIS) | |
| 115 { | |
| 116 Sint32 timeleft; | |
| 117 | |
| 118 timeleft = this->spec.samples - alGetFillable(audio_port); | |
| 119 if ( timeleft > 0 ) { | |
| 120 timeleft /= (this->spec.freq/1000); | |
| 121 SDL_Delay((Uint32)timeleft); | |
| 122 } | |
| 123 } | |
| 124 | |
| 125 static void AL_PlayAudio(_THIS) | |
| 126 { | |
| 127 /* Write the audio data out */ | |
| 128 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { | |
| 129 /* Assume fatal error, for now */ | |
| 130 this->enabled = 0; | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 static Uint8 *AL_GetAudioBuf(_THIS) | |
| 135 { | |
| 136 return(mixbuf); | |
| 137 } | |
| 138 | |
| 139 static void AL_CloseAudio(_THIS) | |
| 140 { | |
| 141 if ( mixbuf != NULL ) { | |
| 142 SDL_FreeAudioMem(mixbuf); | |
| 143 mixbuf = NULL; | |
| 144 } | |
| 145 if ( audio_port != NULL ) { | |
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146 alClosePort(audio_port); |
| 0 | 147 audio_port = NULL; |
| 148 } | |
| 149 } | |
| 150 | |
| 151 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 152 { | |
| 153 ALconfig audio_config; | |
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154 #ifdef OLD_IRIX_AUDIO |
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155 long audio_param[2]; |
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Date: Sun, 18 Jul 2004 16:46:44 +0200
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156 #else |
| 0 | 157 ALpv audio_param; |
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158 #endif |
| 0 | 159 int width; |
| 160 | |
| 161 /* Determine the audio parameters from the AudioSpec */ | |
| 162 switch ( spec->format & 0xFF ) { | |
| 163 | |
| 164 case 8: { /* Signed 8 bit audio data */ | |
| 165 spec->format = AUDIO_S8; | |
| 166 width = AL_SAMPLE_8; | |
| 167 } | |
| 168 break; | |
| 169 | |
| 170 case 16: { /* Signed 16 bit audio data */ | |
| 171 spec->format = AUDIO_S16MSB; | |
| 172 width = AL_SAMPLE_16; | |
| 173 } | |
| 174 break; | |
| 175 | |
| 176 default: { | |
| 177 SDL_SetError("Unsupported audio format"); | |
| 178 return(-1); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 /* Update the fragment size as size in bytes */ | |
| 183 SDL_CalculateAudioSpec(spec); | |
| 184 | |
| 185 /* Set output frequency */ | |
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186 #ifdef OLD_IRIX_AUDIO |
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187 audio_param[0] = AL_OUTPUT_RATE; |
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188 audio_param[1] = spec->freq; |
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189 if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) { |
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190 #else |
| 0 | 191 audio_param.param = AL_RATE; |
| 192 audio_param.value.i = spec->freq; | |
| 193 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) { | |
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194 #endif |
| 0 | 195 SDL_SetError("alSetParams failed"); |
| 196 return(-1); | |
| 197 } | |
| 198 | |
| 199 /* Open the audio port with the requested frequency */ | |
| 200 audio_port = NULL; | |
| 201 audio_config = alNewConfig(); | |
| 202 if ( audio_config && | |
| 203 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) && | |
| 204 (alSetWidth(audio_config, width) >= 0) && | |
| 205 (alSetQueueSize(audio_config, spec->samples*2) >= 0) && | |
| 206 (alSetChannels(audio_config, spec->channels) >= 0) ) { | |
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207 audio_port = alOpenPort("SDL audio", "w", audio_config); |
| 0 | 208 } |
| 209 alFreeConfig(audio_config); | |
| 210 if( audio_port == NULL ) { | |
| 211 SDL_SetError("Unable to open audio port"); | |
| 212 return(-1); | |
| 213 } | |
| 214 | |
| 215 /* Allocate mixing buffer */ | |
| 216 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size); | |
| 217 if ( mixbuf == NULL ) { | |
| 218 SDL_OutOfMemory(); | |
| 219 return(-1); | |
| 220 } | |
| 221 memset(mixbuf, spec->silence, spec->size); | |
| 222 | |
| 223 /* We're ready to rock and roll. :-) */ | |
| 224 return(0); | |
| 225 } |