Mercurial > sdl-ios-xcode
annotate src/audio/baudio/SDL_beaudio.cc @ 1399:c35c161a1100
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 23:18:49 +0000 |
| parents | e440d5c488c1 |
| children | 376665398b25 |
| 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 the audio stream on BeOS */ | |
| 24 | |
| 25 #include <SoundPlayer.h> | |
| 26 | |
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27 #include "../../main/beos/SDL_BeApp.h" |
| 0 | 28 |
| 29 extern "C" { | |
| 30 | |
| 31 #include "SDL_audio.h" | |
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32 #include "../SDL_audio_c.h" |
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33 #include "../SDL_sysaudio.h" |
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34 #include "../../thread/beos/SDL_systhread_c.h" |
| 0 | 35 #include "SDL_beaudio.h" |
| 36 | |
| 37 | |
| 38 /* Audio driver functions */ | |
| 39 static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 40 static void BE_WaitAudio(_THIS); | |
| 41 static void BE_PlayAudio(_THIS); | |
| 42 static Uint8 *BE_GetAudioBuf(_THIS); | |
| 43 static void BE_CloseAudio(_THIS); | |
| 44 | |
| 45 /* Audio driver bootstrap functions */ | |
| 46 | |
| 47 static int Audio_Available(void) | |
| 48 { | |
| 49 return(1); | |
| 50 } | |
| 51 | |
| 52 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 53 { | |
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54 SDL_free(device->hidden); |
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55 SDL_free(device); |
| 0 | 56 } |
| 57 | |
| 58 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 59 { | |
| 60 SDL_AudioDevice *device; | |
| 61 | |
| 62 /* Initialize all variables that we clean on shutdown */ | |
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63 device = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 64 if ( device ) { |
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65 SDL_memset(device, 0, (sizeof *device)); |
| 0 | 66 device->hidden = (struct SDL_PrivateAudioData *) |
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67 SDL_malloc((sizeof *device->hidden)); |
| 0 | 68 } |
| 69 if ( (device == NULL) || (device->hidden == NULL) ) { | |
| 70 SDL_OutOfMemory(); | |
| 71 if ( device ) { | |
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72 SDL_free(device); |
| 0 | 73 } |
| 74 return(0); | |
| 75 } | |
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76 SDL_memset(device->hidden, 0, (sizeof *device->hidden)); |
| 0 | 77 |
| 78 /* Set the function pointers */ | |
| 79 device->OpenAudio = BE_OpenAudio; | |
| 80 device->WaitAudio = BE_WaitAudio; | |
| 81 device->PlayAudio = BE_PlayAudio; | |
| 82 device->GetAudioBuf = BE_GetAudioBuf; | |
| 83 device->CloseAudio = BE_CloseAudio; | |
| 84 | |
| 85 device->free = Audio_DeleteDevice; | |
| 86 | |
| 87 return device; | |
| 88 } | |
| 89 | |
| 90 AudioBootStrap BAUDIO_bootstrap = { | |
| 91 "baudio", "BeOS BSoundPlayer", | |
| 92 Audio_Available, Audio_CreateDevice | |
| 93 }; | |
| 94 | |
| 95 /* The BeOS callback for handling the audio buffer */ | |
| 96 static void FillSound(void *device, void *stream, size_t len, | |
| 97 const media_raw_audio_format &format) | |
| 98 { | |
| 99 SDL_AudioDevice *audio = (SDL_AudioDevice *)device; | |
| 100 | |
| 101 /* Silence the buffer, since it's ours */ | |
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102 SDL_memset(stream, audio->spec.silence, len); |
| 0 | 103 |
| 104 /* Only do soemthing if audio is enabled */ | |
| 105 if ( ! audio->enabled ) | |
| 106 return; | |
| 107 | |
| 108 if ( ! audio->paused ) { | |
| 109 if ( audio->convert.needed ) { | |
| 110 SDL_mutexP(audio->mixer_lock); | |
| 111 (*audio->spec.callback)(audio->spec.userdata, | |
| 112 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 113 SDL_mutexV(audio->mixer_lock); | |
| 114 SDL_ConvertAudio(&audio->convert); | |
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115 SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt); |
| 0 | 116 } else { |
| 117 SDL_mutexP(audio->mixer_lock); | |
| 118 (*audio->spec.callback)(audio->spec.userdata, | |
| 119 (Uint8 *)stream, len); | |
| 120 SDL_mutexV(audio->mixer_lock); | |
| 121 } | |
| 122 } | |
| 123 return; | |
| 124 } | |
| 125 | |
| 126 /* Dummy functions -- we don't use thread-based audio */ | |
| 127 void BE_WaitAudio(_THIS) | |
| 128 { | |
| 129 return; | |
| 130 } | |
| 131 void BE_PlayAudio(_THIS) | |
| 132 { | |
| 133 return; | |
| 134 } | |
| 135 Uint8 *BE_GetAudioBuf(_THIS) | |
| 136 { | |
| 137 return(NULL); | |
| 138 } | |
| 139 | |
| 140 void BE_CloseAudio(_THIS) | |
| 141 { | |
| 142 if ( audio_obj ) { | |
| 143 audio_obj->Stop(); | |
| 144 delete audio_obj; | |
| 145 audio_obj = NULL; | |
| 146 } | |
| 147 | |
| 148 /* Quit the Be Application, if there's nothing left to do */ | |
| 149 SDL_QuitBeApp(); | |
| 150 } | |
| 151 | |
| 152 int BE_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 153 { | |
| 154 media_raw_audio_format format; | |
| 155 | |
| 156 /* Initialize the Be Application, if it's not already started */ | |
| 157 if ( SDL_InitBeApp() < 0 ) { | |
| 158 return(-1); | |
| 159 } | |
| 160 | |
| 161 /* Parse the audio format and fill the Be raw audio format */ | |
| 162 format.frame_rate = (float)spec->freq; | |
| 163 format.channel_count = spec->channels; | |
| 164 switch (spec->format&~0x1000) { | |
| 165 case AUDIO_S8: | |
| 166 /* Signed 8-bit audio unsupported, convert to U8 */ | |
| 167 spec->format = AUDIO_U8; | |
| 168 case AUDIO_U8: | |
| 169 format.format = media_raw_audio_format::B_AUDIO_UCHAR; | |
| 170 format.byte_order = 0; | |
| 171 break; | |
| 172 case AUDIO_U16: | |
| 173 /* Unsigned 16-bit audio unsupported, convert to S16 */ | |
| 174 spec->format ^= 0x8000; | |
| 175 case AUDIO_S16: | |
| 176 format.format = media_raw_audio_format::B_AUDIO_SHORT; | |
| 177 if ( spec->format & 0x1000 ) { | |
| 178 format.byte_order = 1; /* Big endian */ | |
| 179 } else { | |
| 180 format.byte_order = 2; /* Little endian */ | |
| 181 } | |
| 182 break; | |
| 183 } | |
| 184 format.buffer_size = spec->samples; | |
| 185 | |
| 186 /* Calculate the final parameters for this audio specification */ | |
| 187 SDL_CalculateAudioSpec(spec); | |
| 188 | |
| 189 /* Subscribe to the audio stream (creates a new thread) */ | |
| 190 { sigset_t omask; | |
| 191 SDL_MaskSignals(&omask); | |
| 192 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound, | |
| 193 NULL, _this); | |
| 194 SDL_UnmaskSignals(&omask); | |
| 195 } | |
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196 if ( audio_obj->Start() == B_NO_ERROR ) { |
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197 audio_obj->SetHasData(true); |
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198 } else { |
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199 SDL_SetError("Unable to start Be audio"); |
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200 return(-1); |
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201 } |
| 0 | 202 |
| 203 /* We're running! */ | |
| 204 return(1); | |
| 205 } | |
| 206 | |
| 207 }; /* Extern C */ |