Mercurial > sdl-ios-xcode
annotate src/audio/dmedia/SDL_irixaudio.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | 6e6248801043 |
| children | 3692456e7b0f |
| 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 */ |
| 22 | |
| 23 /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ | |
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24 /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
| 0 | 25 |
| 26 #include <stdlib.h> | |
| 27 | |
| 28 #include "SDL_endian.h" | |
| 29 #include "SDL_timer.h" | |
| 30 #include "SDL_audio.h" | |
| 31 #include "SDL_audiomem.h" | |
| 32 #include "SDL_audio_c.h" | |
| 33 #include "SDL_irixaudio.h" | |
| 34 | |
| 35 | |
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36 #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
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37 #define OLD_IRIX_AUDIO |
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38 #define alClosePort(x) ALcloseport(x) |
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39 #define alFreeConfig(x) ALfreeconfig(x) |
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40 #define alGetFillable(x) ALgetfillable(x) |
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41 #define alNewConfig() ALnewconfig() |
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42 #define alOpenPort(x,y,z) ALopenport(x,y,z) |
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43 #define alSetChannels(x,y) ALsetchannels(x,y) |
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44 #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
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45 #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
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46 #define alSetWidth(x,y) ALsetwidth(x,y) |
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47 #endif |
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48 |
| 0 | 49 /* Audio driver functions */ |
| 50 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 51 static void AL_WaitAudio(_THIS); | |
| 52 static void AL_PlayAudio(_THIS); | |
| 53 static Uint8 *AL_GetAudioBuf(_THIS); | |
| 54 static void AL_CloseAudio(_THIS); | |
| 55 | |
| 56 /* Audio driver bootstrap functions */ | |
| 57 | |
| 58 static int Audio_Available(void) | |
| 59 { | |
| 60 return 1; | |
| 61 } | |
| 62 | |
| 63 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 64 { | |
| 65 free(device->hidden); | |
| 66 free(device); | |
| 67 } | |
| 68 | |
| 69 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 70 { | |
| 71 SDL_AudioDevice *this; | |
| 72 | |
| 73 /* Initialize all variables that we clean on shutdown */ | |
| 74 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 75 if ( this ) { | |
| 76 memset(this, 0, (sizeof *this)); | |
| 77 this->hidden = (struct SDL_PrivateAudioData *) | |
| 78 malloc((sizeof *this->hidden)); | |
| 79 } | |
| 80 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 81 SDL_OutOfMemory(); | |
| 82 if ( this ) { | |
| 83 free(this); | |
| 84 } | |
| 85 return(0); | |
| 86 } | |
| 87 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 88 | |
| 89 /* Set the function pointers */ | |
| 90 this->OpenAudio = AL_OpenAudio; | |
| 91 this->WaitAudio = AL_WaitAudio; | |
| 92 this->PlayAudio = AL_PlayAudio; | |
| 93 this->GetAudioBuf = AL_GetAudioBuf; | |
| 94 this->CloseAudio = AL_CloseAudio; | |
| 95 | |
| 96 this->free = Audio_DeleteDevice; | |
| 97 | |
| 98 return this; | |
| 99 } | |
| 100 | |
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101 AudioBootStrap DMEDIA_bootstrap = { |
| 0 | 102 "AL", "IRIX DMedia audio", |
| 103 Audio_Available, Audio_CreateDevice | |
| 104 }; | |
| 105 | |
| 106 | |
| 107 void static AL_WaitAudio(_THIS) | |
| 108 { | |
| 109 Sint32 timeleft; | |
| 110 | |
| 111 timeleft = this->spec.samples - alGetFillable(audio_port); | |
| 112 if ( timeleft > 0 ) { | |
| 113 timeleft /= (this->spec.freq/1000); | |
| 114 SDL_Delay((Uint32)timeleft); | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 static void AL_PlayAudio(_THIS) | |
| 119 { | |
| 120 /* Write the audio data out */ | |
| 121 if ( alWriteFrames(audio_port, mixbuf, this->spec.samples) < 0 ) { | |
| 122 /* Assume fatal error, for now */ | |
| 123 this->enabled = 0; | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 static Uint8 *AL_GetAudioBuf(_THIS) | |
| 128 { | |
| 129 return(mixbuf); | |
| 130 } | |
| 131 | |
| 132 static void AL_CloseAudio(_THIS) | |
| 133 { | |
| 134 if ( mixbuf != NULL ) { | |
| 135 SDL_FreeAudioMem(mixbuf); | |
| 136 mixbuf = NULL; | |
| 137 } | |
| 138 if ( audio_port != NULL ) { | |
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139 alClosePort(audio_port); |
| 0 | 140 audio_port = NULL; |
| 141 } | |
| 142 } | |
| 143 | |
| 144 static int AL_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 145 { | |
| 146 ALconfig audio_config; | |
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147 #ifdef OLD_IRIX_AUDIO |
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148 long audio_param[2]; |
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149 #else |
| 0 | 150 ALpv audio_param; |
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151 #endif |
| 0 | 152 int width; |
| 153 | |
| 154 /* Determine the audio parameters from the AudioSpec */ | |
| 155 switch ( spec->format & 0xFF ) { | |
| 156 | |
| 157 case 8: { /* Signed 8 bit audio data */ | |
| 158 spec->format = AUDIO_S8; | |
| 159 width = AL_SAMPLE_8; | |
| 160 } | |
| 161 break; | |
| 162 | |
| 163 case 16: { /* Signed 16 bit audio data */ | |
| 164 spec->format = AUDIO_S16MSB; | |
| 165 width = AL_SAMPLE_16; | |
| 166 } | |
| 167 break; | |
| 168 | |
| 169 default: { | |
| 170 SDL_SetError("Unsupported audio format"); | |
| 171 return(-1); | |
| 172 } | |
| 173 } | |
| 174 | |
| 175 /* Update the fragment size as size in bytes */ | |
| 176 SDL_CalculateAudioSpec(spec); | |
| 177 | |
| 178 /* Set output frequency */ | |
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179 #ifdef OLD_IRIX_AUDIO |
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180 audio_param[0] = AL_OUTPUT_RATE; |
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181 audio_param[1] = spec->freq; |
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182 if( ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0 ) { |
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183 #else |
| 0 | 184 audio_param.param = AL_RATE; |
| 185 audio_param.value.i = spec->freq; | |
| 186 if( alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0 ) { | |
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187 #endif |
| 0 | 188 SDL_SetError("alSetParams failed"); |
| 189 return(-1); | |
| 190 } | |
| 191 | |
| 192 /* Open the audio port with the requested frequency */ | |
| 193 audio_port = NULL; | |
| 194 audio_config = alNewConfig(); | |
| 195 if ( audio_config && | |
| 196 (alSetSampFmt(audio_config, AL_SAMPFMT_TWOSCOMP) >= 0) && | |
| 197 (alSetWidth(audio_config, width) >= 0) && | |
| 198 (alSetQueueSize(audio_config, spec->samples*2) >= 0) && | |
| 199 (alSetChannels(audio_config, spec->channels) >= 0) ) { | |
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200 audio_port = alOpenPort("SDL audio", "w", audio_config); |
| 0 | 201 } |
| 202 alFreeConfig(audio_config); | |
| 203 if( audio_port == NULL ) { | |
| 204 SDL_SetError("Unable to open audio port"); | |
| 205 return(-1); | |
| 206 } | |
| 207 | |
| 208 /* Allocate mixing buffer */ | |
| 209 mixbuf = (Uint8 *)SDL_AllocAudioMem(spec->size); | |
| 210 if ( mixbuf == NULL ) { | |
| 211 SDL_OutOfMemory(); | |
| 212 return(-1); | |
| 213 } | |
| 214 memset(mixbuf, spec->silence, spec->size); | |
| 215 | |
| 216 /* We're ready to rock and roll. :-) */ | |
| 217 return(0); | |
| 218 } |