Mercurial > sdl-ios-xcode
annotate src/audio/baudio/SDL_beaudio.cc @ 1339:62802d9d7c87
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 07 Feb 2006 10:40:14 +0000 |
| parents | 604d73db6802 |
| children | c71e05b4dc2e |
| 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 | |
| 27 #include "SDL_BeApp.h" | |
| 28 | |
| 29 extern "C" { | |
| 30 | |
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31 #include "SDL_stdlib.h" |
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32 #include "SDL_string.h" |
| 0 | 33 #include "SDL_audio.h" |
| 34 #include "SDL_audio_c.h" | |
| 35 #include "SDL_sysaudio.h" | |
| 36 #include "SDL_systhread_c.h" | |
| 37 #include "SDL_beaudio.h" | |
| 38 | |
| 39 | |
| 40 /* Audio driver functions */ | |
| 41 static int BE_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 42 static void BE_WaitAudio(_THIS); | |
| 43 static void BE_PlayAudio(_THIS); | |
| 44 static Uint8 *BE_GetAudioBuf(_THIS); | |
| 45 static void BE_CloseAudio(_THIS); | |
| 46 | |
| 47 /* Audio driver bootstrap functions */ | |
| 48 | |
| 49 static int Audio_Available(void) | |
| 50 { | |
| 51 return(1); | |
| 52 } | |
| 53 | |
| 54 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 55 { | |
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56 SDL_free(device->hidden); |
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57 SDL_free(device); |
| 0 | 58 } |
| 59 | |
| 60 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 61 { | |
| 62 SDL_AudioDevice *device; | |
| 63 | |
| 64 /* Initialize all variables that we clean on shutdown */ | |
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65 device = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 66 if ( device ) { |
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67 SDL_memset(device, 0, (sizeof *device)); |
| 0 | 68 device->hidden = (struct SDL_PrivateAudioData *) |
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69 SDL_malloc((sizeof *device->hidden)); |
| 0 | 70 } |
| 71 if ( (device == NULL) || (device->hidden == NULL) ) { | |
| 72 SDL_OutOfMemory(); | |
| 73 if ( device ) { | |
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74 SDL_free(device); |
| 0 | 75 } |
| 76 return(0); | |
| 77 } | |
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78 SDL_memset(device->hidden, 0, (sizeof *device->hidden)); |
| 0 | 79 |
| 80 /* Set the function pointers */ | |
| 81 device->OpenAudio = BE_OpenAudio; | |
| 82 device->WaitAudio = BE_WaitAudio; | |
| 83 device->PlayAudio = BE_PlayAudio; | |
| 84 device->GetAudioBuf = BE_GetAudioBuf; | |
| 85 device->CloseAudio = BE_CloseAudio; | |
| 86 | |
| 87 device->free = Audio_DeleteDevice; | |
| 88 | |
| 89 return device; | |
| 90 } | |
| 91 | |
| 92 AudioBootStrap BAUDIO_bootstrap = { | |
| 93 "baudio", "BeOS BSoundPlayer", | |
| 94 Audio_Available, Audio_CreateDevice | |
| 95 }; | |
| 96 | |
| 97 /* The BeOS callback for handling the audio buffer */ | |
| 98 static void FillSound(void *device, void *stream, size_t len, | |
| 99 const media_raw_audio_format &format) | |
| 100 { | |
| 101 SDL_AudioDevice *audio = (SDL_AudioDevice *)device; | |
| 102 | |
| 103 /* Silence the buffer, since it's ours */ | |
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104 SDL_memset(stream, audio->spec.silence, len); |
| 0 | 105 |
| 106 /* Only do soemthing if audio is enabled */ | |
| 107 if ( ! audio->enabled ) | |
| 108 return; | |
| 109 | |
| 110 if ( ! audio->paused ) { | |
| 111 if ( audio->convert.needed ) { | |
| 112 SDL_mutexP(audio->mixer_lock); | |
| 113 (*audio->spec.callback)(audio->spec.userdata, | |
| 114 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 115 SDL_mutexV(audio->mixer_lock); | |
| 116 SDL_ConvertAudio(&audio->convert); | |
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117 SDL_memcpy(stream,audio->convert.buf,audio->convert.len_cvt); |
| 0 | 118 } else { |
| 119 SDL_mutexP(audio->mixer_lock); | |
| 120 (*audio->spec.callback)(audio->spec.userdata, | |
| 121 (Uint8 *)stream, len); | |
| 122 SDL_mutexV(audio->mixer_lock); | |
| 123 } | |
| 124 } | |
| 125 return; | |
| 126 } | |
| 127 | |
| 128 /* Dummy functions -- we don't use thread-based audio */ | |
| 129 void BE_WaitAudio(_THIS) | |
| 130 { | |
| 131 return; | |
| 132 } | |
| 133 void BE_PlayAudio(_THIS) | |
| 134 { | |
| 135 return; | |
| 136 } | |
| 137 Uint8 *BE_GetAudioBuf(_THIS) | |
| 138 { | |
| 139 return(NULL); | |
| 140 } | |
| 141 | |
| 142 void BE_CloseAudio(_THIS) | |
| 143 { | |
| 144 if ( audio_obj ) { | |
| 145 audio_obj->Stop(); | |
| 146 delete audio_obj; | |
| 147 audio_obj = NULL; | |
| 148 } | |
| 149 | |
| 150 /* Quit the Be Application, if there's nothing left to do */ | |
| 151 SDL_QuitBeApp(); | |
| 152 } | |
| 153 | |
| 154 int BE_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 155 { | |
| 156 media_raw_audio_format format; | |
| 157 | |
| 158 /* Initialize the Be Application, if it's not already started */ | |
| 159 if ( SDL_InitBeApp() < 0 ) { | |
| 160 return(-1); | |
| 161 } | |
| 162 | |
| 163 /* Parse the audio format and fill the Be raw audio format */ | |
| 164 format.frame_rate = (float)spec->freq; | |
| 165 format.channel_count = spec->channels; | |
| 166 switch (spec->format&~0x1000) { | |
| 167 case AUDIO_S8: | |
| 168 /* Signed 8-bit audio unsupported, convert to U8 */ | |
| 169 spec->format = AUDIO_U8; | |
| 170 case AUDIO_U8: | |
| 171 format.format = media_raw_audio_format::B_AUDIO_UCHAR; | |
| 172 format.byte_order = 0; | |
| 173 break; | |
| 174 case AUDIO_U16: | |
| 175 /* Unsigned 16-bit audio unsupported, convert to S16 */ | |
| 176 spec->format ^= 0x8000; | |
| 177 case AUDIO_S16: | |
| 178 format.format = media_raw_audio_format::B_AUDIO_SHORT; | |
| 179 if ( spec->format & 0x1000 ) { | |
| 180 format.byte_order = 1; /* Big endian */ | |
| 181 } else { | |
| 182 format.byte_order = 2; /* Little endian */ | |
| 183 } | |
| 184 break; | |
| 185 } | |
| 186 format.buffer_size = spec->samples; | |
| 187 | |
| 188 /* Calculate the final parameters for this audio specification */ | |
| 189 SDL_CalculateAudioSpec(spec); | |
| 190 | |
| 191 /* Subscribe to the audio stream (creates a new thread) */ | |
| 192 { sigset_t omask; | |
| 193 SDL_MaskSignals(&omask); | |
| 194 audio_obj = new BSoundPlayer(&format, "SDL Audio", FillSound, | |
| 195 NULL, _this); | |
| 196 SDL_UnmaskSignals(&omask); | |
| 197 } | |
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198 if ( audio_obj->Start() == B_NO_ERROR ) { |
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199 audio_obj->SetHasData(true); |
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200 } else { |
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201 SDL_SetError("Unable to start Be audio"); |
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202 return(-1); |
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203 } |
| 0 | 204 |
| 205 /* We're running! */ | |
| 206 return(1); | |
| 207 } | |
| 208 | |
| 209 }; /* Extern C */ |