Mercurial > sdl-ios-xcode
annotate src/audio/baudio/SDL_beaudio.cc @ 3851:405a192b68e7 SDL-1.2
Backport from 1.3: most of the audio drivers can now handle data
conversion at a higher level when they can't open the hardware in the
exact format requested.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 01 Sep 2006 22:50:24 +0000 |
| parents | 376665398b25 |
| children | 5b5e549382b3 |
| 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 the audio stream on BeOS */ | |
| 25 | |
| 26 #include <SoundPlayer.h> | |
| 27 | |
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28 #include "../../main/beos/SDL_BeApp.h" |
| 0 | 29 |
| 30 extern "C" { | |
| 31 | |
| 32 #include "SDL_audio.h" | |
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33 #include "../SDL_audio_c.h" |
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34 #include "../SDL_sysaudio.h" |
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35 #include "../../thread/beos/SDL_systhread_c.h" |
| 0 | 36 #include "SDL_beaudio.h" |
| 37 | |
| 38 | |
| 39 /* Audio driver functions */ | |
| 40 static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 41 static void BE_WaitAudio(_THIS); | |
| 42 static void BE_PlayAudio(_THIS); | |
| 43 static Uint8 *BE_GetAudioBuf(_THIS); | |
| 44 static void BE_CloseAudio(_THIS); | |
| 45 | |
| 46 /* Audio driver bootstrap functions */ | |
| 47 | |
| 48 static int Audio_Available(void) | |
| 49 { | |
| 50 return(1); | |
| 51 } | |
| 52 | |
| 53 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 54 { | |
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55 SDL_free(device->hidden); |
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56 SDL_free(device); |
| 0 | 57 } |
| 58 | |
| 59 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 60 { | |
| 61 SDL_AudioDevice *device; | |
| 62 | |
| 63 /* Initialize all variables that we clean on shutdown */ | |
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64 device = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 65 if ( device ) { |
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66 SDL_memset(device, 0, (sizeof *device)); |
| 0 | 67 device->hidden = (struct SDL_PrivateAudioData *) |
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68 SDL_malloc((sizeof *device->hidden)); |
| 0 | 69 } |
| 70 if ( (device == NULL) || (device->hidden == NULL) ) { | |
| 71 SDL_OutOfMemory(); | |
| 72 if ( device ) { | |
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73 SDL_free(device); |
| 0 | 74 } |
| 75 return(0); | |
| 76 } | |
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77 SDL_memset(device->hidden, 0, (sizeof *device->hidden)); |
| 0 | 78 |
| 79 /* Set the function pointers */ | |
| 80 device->OpenAudio = BE_OpenAudio; | |
| 81 device->WaitAudio = BE_WaitAudio; | |
| 82 device->PlayAudio = BE_PlayAudio; | |
| 83 device->GetAudioBuf = BE_GetAudioBuf; | |
| 84 device->CloseAudio = BE_CloseAudio; | |
| 85 | |
| 86 device->free = Audio_DeleteDevice; | |
| 87 | |
| 88 return device; | |
| 89 } | |
| 90 | |
| 91 AudioBootStrap BAUDIO_bootstrap = { | |
| 92 "baudio", "BeOS BSoundPlayer", | |
| 93 Audio_Available, Audio_CreateDevice | |
| 94 }; | |
| 95 | |
| 96 /* The BeOS callback for handling the audio buffer */ | |
| 97 static void FillSound(void *device, void *stream, size_t len, | |
| 98 const media_raw_audio_format &format) | |
| 99 { | |
| 100 SDL_AudioDevice *audio = (SDL_AudioDevice *)device; | |
| 101 | |
| 102 /* Silence the buffer, since it's ours */ | |
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103 SDL_memset(stream, audio->spec.silence, len); |
| 0 | 104 |
| 105 /* Only do soemthing if audio is enabled */ | |
| 106 if ( ! audio->enabled ) | |
| 107 return; | |
| 108 | |
| 109 if ( ! audio->paused ) { | |
| 110 if ( audio->convert.needed ) { | |
| 111 SDL_mutexP(audio->mixer_lock); | |
| 112 (*audio->spec.callback)(audio->spec.userdata, | |
| 113 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 114 SDL_mutexV(audio->mixer_lock); | |
| 115 SDL_ConvertAudio(&audio->convert); | |
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116 SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt); |
| 0 | 117 } else { |
| 118 SDL_mutexP(audio->mixer_lock); | |
| 119 (*audio->spec.callback)(audio->spec.userdata, | |
| 120 (Uint8 *)stream, len); | |
| 121 SDL_mutexV(audio->mixer_lock); | |
| 122 } | |
| 123 } | |
| 124 return; | |
| 125 } | |
| 126 | |
| 127 /* Dummy functions -- we don't use thread-based audio */ | |
| 128 void BE_WaitAudio(_THIS) | |
| 129 { | |
| 130 return; | |
| 131 } | |
| 132 void BE_PlayAudio(_THIS) | |
| 133 { | |
| 134 return; | |
| 135 } | |
| 136 Uint8 *BE_GetAudioBuf(_THIS) | |
| 137 { | |
| 138 return(NULL); | |
| 139 } | |
| 140 | |
| 141 void BE_CloseAudio(_THIS) | |
| 142 { | |
| 143 if ( audio_obj ) { | |
| 144 audio_obj->Stop(); | |
| 145 delete audio_obj; | |
| 146 audio_obj = NULL; | |
| 147 } | |
| 148 | |
| 149 /* Quit the Be Application, if there's nothing left to do */ | |
| 150 SDL_QuitBeApp(); | |
| 151 } | |
| 152 | |
| 153 int BE_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 154 { | |
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155 int valid_datatype = 0; |
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156 media_raw_audio_format format; |
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157 SDL_AudioFormat test_format = SDL_FirstAudioFormat(spec->format); |
| 0 | 158 |
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159 /* Parse the audio format and fill the Be raw audio format */ |
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160 memset(&format, '\0', sizeof (media_raw_audio_format)); |
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161 format.byte_order = B_MEDIA_LITTLE_ENDIAN; |
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162 format.frame_rate = (float) spec->freq; |
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163 format.channel_count = spec->channels; /* !!! FIXME: support > 2? */ |
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164 while ((!valid_datatype) && (test_format)) { |
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165 valid_datatype = 1; |
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166 spec->format = test_format; |
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167 switch (test_format) { |
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168 case AUDIO_S8: |
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169 format.format = media_raw_audio_format::B_AUDIO_CHAR; |
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170 break; |
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171 |
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172 case AUDIO_U8: |
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173 format.format = media_raw_audio_format::B_AUDIO_UCHAR; |
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174 break; |
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175 |
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176 case AUDIO_S16LSB: |
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177 format.format = media_raw_audio_format::B_AUDIO_SHORT; |
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178 break; |
| 0 | 179 |
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180 case AUDIO_S16MSB: |
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181 format.format = media_raw_audio_format::B_AUDIO_SHORT; |
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182 format.byte_order = B_MEDIA_BIG_ENDIAN; |
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183 break; |
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184 |
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185 default: |
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186 valid_datatype = 0; |
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187 test_format = SDL_NextAudioFormat(); |
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188 break; |
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189 } |
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190 } |
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191 |
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192 if (!valid_datatype) { /* shouldn't happen, but just in case... */ |
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193 SDL_SetError("Unsupported audio format"); |
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194 return (-1); |
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195 } |
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196 |
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197 /* Initialize the Be Application, if it's not already started */ |
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198 if (SDL_InitBeApp() < 0) { |
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199 return (-1); |
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200 } |
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201 |
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202 format.buffer_size = spec->samples; |
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203 |
| 0 | 204 /* Calculate the final parameters for this audio specification */ |
| 205 SDL_CalculateAudioSpec(spec); | |
| 206 | |
| 207 /* Subscribe to the audio stream (creates a new thread) */ | |
| 208 { sigset_t omask; | |
| 209 SDL_MaskSignals(&omask); | |
| 210 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound, | |
| 211 NULL, _this); | |
| 212 SDL_UnmaskSignals(&omask); | |
| 213 } | |
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214 if ( audio_obj->Start() == B_NO_ERROR ) { |
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215 audio_obj->SetHasData(true); |
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216 } else { |
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217 SDL_SetError("Unable to start Be audio"); |
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218 return(-1); |
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219 } |
| 0 | 220 |
| 221 /* We're running! */ | |
| 222 return(1); | |
| 223 } | |
| 224 | |
| 225 }; /* Extern C */ |