Mercurial > sdl-ios-xcode
annotate src/audio/dmedia/SDL_irixaudio.c @ 900:c3c8739f7844
*** empty log message ***
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 27 May 2004 22:57:30 +0000 |
| parents | 6399f4e90211 |
| children | 6e6248801043 |
| 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) */ | |
| 31 | |
| 32 #include <stdlib.h> | |
| 33 | |
| 34 #include "SDL_endian.h" | |
| 35 #include "SDL_timer.h" | |
| 36 #include "SDL_audio.h" | |
| 37 #include "SDL_audiomem.h" | |
| 38 #include "SDL_audio_c.h" | |
| 39 #include "SDL_irixaudio.h" | |
| 40 | |
| 41 | |
| 42 /* Audio driver functions */ | |
| 43 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 44 static void AL_WaitAudio(_THIS); | |
| 45 static void AL_PlayAudio(_THIS); | |
| 46 static Uint8 *AL_GetAudioBuf(_THIS); | |
| 47 static void AL_CloseAudio(_THIS); | |
| 48 | |
| 49 /* Audio driver bootstrap functions */ | |
| 50 | |
| 51 static int Audio_Available(void) | |
| 52 { | |
| 53 return 1; | |
| 54 } | |
| 55 | |
| 56 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 57 { | |
| 58 free(device->hidden); | |
| 59 free(device); | |
| 60 } | |
| 61 | |
| 62 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 63 { | |
| 64 SDL_AudioDevice *this; | |
| 65 | |
| 66 /* Initialize all variables that we clean on shutdown */ | |
| 67 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 68 if ( this ) { | |
| 69 memset(this, 0, (sizeof *this)); | |
| 70 this->hidden = (struct SDL_PrivateAudioData *) | |
| 71 malloc((sizeof *this->hidden)); | |
| 72 } | |
| 73 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 74 SDL_OutOfMemory(); | |
| 75 if ( this ) { | |
| 76 free(this); | |
| 77 } | |
| 78 return(0); | |
| 79 } | |
| 80 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 81 | |
| 82 /* Set the function pointers */ | |
| 83 this->OpenAudio = AL_OpenAudio; | |
| 84 this->WaitAudio = AL_WaitAudio; | |
| 85 this->PlayAudio = AL_PlayAudio; | |
| 86 this->GetAudioBuf = AL_GetAudioBuf; | |
| 87 this->CloseAudio = AL_CloseAudio; | |
| 88 | |
| 89 this->free = Audio_DeleteDevice; | |
| 90 | |
| 91 return this; | |
| 92 } | |
| 93 | |
|
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94 AudioBootStrap DMEDIA_bootstrap = { |
| 0 | 95 "AL", "IRIX DMedia audio", |
| 96 Audio_Available, Audio_CreateDevice | |
| 97 }; | |
| 98 | |
| 99 | |
| 100 void static AL_WaitAudio(_THIS) | |
| 101 { | |
| 102 Sint32 timeleft; | |
| 103 | |
| 104 timeleft = this->spec.samples - alGetFillable(audio_port); | |
| 105 if ( timeleft > 0 ) { | |
| 106 timeleft /= (this->spec.freq/1000); | |
| 107 SDL_Delay((Uint32)timeleft); | |
| 108 } | |
| 109 } | |
| 110 | |
| 111 static void AL_PlayAudio(_THIS) | |
| 112 { | |
| 113 /* Write the audio data out */ | |
| 114 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { | |
| 115 /* Assume fatal error, for now */ | |
| 116 this->enabled = 0; | |
| 117 } | |
| 118 } | |
| 119 | |
| 120 static Uint8 *AL_GetAudioBuf(_THIS) | |
| 121 { | |
| 122 return(mixbuf); | |
| 123 } | |
| 124 | |
| 125 static void AL_CloseAudio(_THIS) | |
| 126 { | |
| 127 if ( mixbuf != NULL ) { | |
| 128 SDL_FreeAudioMem(mixbuf); | |
| 129 mixbuf = NULL; | |
| 130 } | |
| 131 if ( audio_port != NULL ) { | |
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132 alClosePort(audio_port); |
| 0 | 133 audio_port = NULL; |
| 134 } | |
| 135 } | |
| 136 | |
| 137 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 138 { | |
| 139 ALconfig audio_config; | |
| 140 ALpv audio_param; | |
| 141 int width; | |
| 142 | |
| 143 /* Determine the audio parameters from the AudioSpec */ | |
| 144 switch ( spec->format & 0xFF ) { | |
| 145 | |
| 146 case 8: { /* Signed 8 bit audio data */ | |
| 147 spec->format = AUDIO_S8; | |
| 148 width = AL_SAMPLE_8; | |
| 149 } | |
| 150 break; | |
| 151 | |
| 152 case 16: { /* Signed 16 bit audio data */ | |
| 153 spec->format = AUDIO_S16MSB; | |
| 154 width = AL_SAMPLE_16; | |
| 155 } | |
| 156 break; | |
| 157 | |
| 158 default: { | |
| 159 SDL_SetError("Unsupported audio format"); | |
| 160 return(-1); | |
| 161 } | |
| 162 } | |
| 163 | |
| 164 /* Update the fragment size as size in bytes */ | |
| 165 SDL_CalculateAudioSpec(spec); | |
| 166 | |
| 167 /* Set output frequency */ | |
| 168 audio_param.param = AL_RATE; | |
| 169 audio_param.value.i = spec->freq; | |
| 170 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) { | |
| 171 SDL_SetError("alSetParams failed"); | |
| 172 return(-1); | |
| 173 } | |
| 174 | |
| 175 /* Open the audio port with the requested frequency */ | |
| 176 audio_port = NULL; | |
| 177 audio_config = alNewConfig(); | |
| 178 if ( audio_config && | |
| 179 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) && | |
| 180 (alSetWidth(audio_config, width) >= 0) && | |
| 181 (alSetQueueSize(audio_config, spec->samples*2) >= 0) && | |
| 182 (alSetChannels(audio_config, spec->channels) >= 0) ) { | |
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parents:
252
diff
changeset
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183 audio_port = alOpenPort("SDL audio", "w", audio_config); |
| 0 | 184 } |
| 185 alFreeConfig(audio_config); | |
| 186 if( audio_port == NULL ) { | |
| 187 SDL_SetError("Unable to open audio port"); | |
| 188 return(-1); | |
| 189 } | |
| 190 | |
| 191 /* Allocate mixing buffer */ | |
| 192 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size); | |
| 193 if ( mixbuf == NULL ) { | |
| 194 SDL_OutOfMemory(); | |
| 195 return(-1); | |
| 196 } | |
| 197 memset(mixbuf, spec->silence, spec->size); | |
| 198 | |
| 199 /* We're ready to rock and roll. :-) */ | |
| 200 return(0); | |
| 201 } |