| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 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 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* Allow access to a raw mixing buffer (For IRIX 6.5 and higher) */ |
| 25 | /* patch for IRIX 5 by Georg Schwarz 18/07/2004 */ |
| 26 | |
| 27 | #include "SDL_timer.h" |
| 28 | #include "SDL_audio.h" |
| 29 | #include "../SDL_audiomem.h" |
| 30 | #include "../SDL_audio_c.h" |
| 31 | #include "SDL_irixaudio.h" |
| 32 | |
| 33 | |
| 34 | #ifndef AL_RESOURCE /* as a test whether we use the old IRIX audio libraries */ |
| 35 | #define OLD_IRIX_AUDIO |
| 36 | #define alClosePort(x) ALcloseport(x) |
| 37 | #define alFreeConfig(x) ALfreeconfig(x) |
| 38 | #define alGetFillable(x) ALgetfillable(x) |
| 39 | #define alNewConfig() ALnewconfig() |
| 40 | #define alOpenPort(x,y,z) ALopenport(x,y,z) |
| 41 | #define alSetChannels(x,y) ALsetchannels(x,y) |
| 42 | #define alSetQueueSize(x,y) ALsetqueuesize(x,y) |
| 43 | #define alSetSampFmt(x,y) ALsetsampfmt(x,y) |
| 44 | #define alSetWidth(x,y) ALsetwidth(x,y) |
| 45 | #endif |
| 46 | |
| 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 | { |
| 63 | SDL_free(device->hidden); |
| 64 | SDL_free(device); |
| 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 */ |
| 72 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 73 | if ( this ) { |
| 74 | SDL_memset(this, 0, (sizeof *this)); |
| 75 | this->hidden = (struct SDL_PrivateAudioData *) |
| 76 | SDL_malloc((sizeof *this->hidden)); |
| 77 | } |
| 78 | if ( (this == NULL) || (this->hidden == NULL) ) { |
| 79 | SDL_OutOfMemory(); |
| 80 | if ( this ) { |
| 81 | SDL_free(this); |
| 82 | } |
| 83 | return(0); |
| 84 | } |
| 85 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 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 | |
| 99 | AudioBootStrap DMEDIA_bootstrap = { |
| 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 ) { |
| 137 | alClosePort(audio_port); |
| 138 | audio_port = NULL; |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | static int AL_OpenAudio(_THIS, SDL_AudioSpec * spec) |
| 143 | { |
| 144 | Uint16 test_format = SDL_FirstAudioFormat(spec->format); |
| 145 | long width = 0; |
| 146 | long fmt = 0; |
| 147 | int valid = 0; |
| 148 | |
| 149 | #ifdef OLD_IRIX_AUDIO |
| 150 | { |
| 151 | long audio_param[2]; |
| 152 | audio_param[0] = AL_OUTPUT_RATE; |
| 153 | audio_param[1] = spec->freq; |
| 154 | valid = (ALsetparams(AL_DEFAULT_DEVICE, audio_param, 2) < 0); |
| 155 | } |
| 156 | #else |
| 157 | { |
| 158 | ALpv audio_param; |
| 159 | audio_param.param = AL_RATE; |
| 160 | audio_param.value.i = spec->freq; |
| 161 | valid = (alSetParams(AL_DEFAULT_OUTPUT, &audio_param, 1) < 0); |
| 162 | } |
| 163 | #endif |
| 164 | |
| 165 | while ((!valid) && (test_format)) { |
| 166 | valid = 1; |
| 167 | spec->format = test_format; |
| 168 | |
| 169 | switch (test_format) { |
| 170 | case AUDIO_S8: |
| 171 | width = AL_SAMPLE_8; |
| 172 | fmt = AL_SAMPFMT_TWOSCOMP; |
| 173 | break; |
| 174 | |
| 175 | case AUDIO_S16SYS: |
| 176 | width = AL_SAMPLE_16; |
| 177 | fmt = AL_SAMPFMT_TWOSCOMP; |
| 178 | break; |
| 179 | |
| 180 | default: |
| 181 | valid = 0; |
| 182 | test_format = SDL_NextAudioFormat(); |
| 183 | break; |
| 184 | } |
| 185 | |
| 186 | if (valid) { |
| 187 | ALconfig audio_config = alNewConfig(); |
| 188 | valid = 0; |
| 189 | if (audio_config) { |
| 190 | if (alSetChannels(audio_config, spec->channels) < 0) { |
| 191 | if (spec->channels > 2) { /* can't handle > stereo? */ |
| 192 | spec->channels = 2; /* try again below. */ |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | if ((alSetSampFmt(audio_config, fmt) >= 0) && |
| 197 | ((!width) || (alSetWidth(audio_config, width) >= 0)) && |
| 198 | (alSetQueueSize(audio_config, spec->samples * 2) >= 0) && |
| 199 | (alSetChannels(audio_config, spec->channels) >= 0)) { |
| 200 | |
| 201 | audio_port = alOpenPort("SDL audio", "w", audio_config); |
| 202 | if (audio_port == NULL) { |
| 203 | /* docs say AL_BAD_CHANNELS happens here, too. */ |
| 204 | int err = oserror(); |
| 205 | if (err == AL_BAD_CHANNELS) { |
| 206 | spec->channels = 2; |
| 207 | alSetChannels(audio_config, spec->channels); |
| 208 | audio_port = alOpenPort("SDL audio", "w", |
| 209 | audio_config); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | if (audio_port != NULL) { |
| 214 | valid = 1; |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | alFreeConfig(audio_config); |
| 219 | } |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | if (!valid) { |
| 224 | SDL_SetError("Unsupported audio format"); |
| 225 | return (-1); |
| 226 | } |
| 227 | |
| 228 | /* Update the fragment size as size in bytes */ |
| 229 | SDL_CalculateAudioSpec(spec); |
| 230 | |
| 231 | /* Allocate mixing buffer */ |
| 232 | mixbuf = (Uint8 *) SDL_AllocAudioMem(spec->size); |
| 233 | if (mixbuf == NULL) { |
| 234 | SDL_OutOfMemory(); |
| 235 | return (-1); |
| 236 | } |
| 237 | SDL_memset(mixbuf, spec->silence, spec->size); |
| 238 | |
| 239 | /* We're ready to rock and roll. :-) */ |
| 240 | return (0); |
| 241 | } |
| 242 | |