| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/unix/sound_sdl.cpp |
| 3 | // Purpose: wxSound backend using SDL |
| 4 | // Author: Vaclav Slavik |
| 5 | // Modified by: |
| 6 | // Created: 2004/01/31 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) 2004, Open Source Applications Foundation |
| 9 | // Licence: wxWindows licence |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // for compilers that support precompilation, includes "wx.h". |
| 13 | #include "wx/wxprec.h" |
| 14 | |
| 15 | #if defined(__BORLANDC__) |
| 16 | #pragma hdrstop |
| 17 | #endif |
| 18 | |
| 19 | #if wxUSE_SOUND && wxUSE_LIBSDL |
| 20 | |
| 21 | #include <SDL.h> |
| 22 | |
| 23 | #ifndef WX_PRECOMP |
| 24 | #include "wx/event.h" |
| 25 | #include "wx/intl.h" |
| 26 | #include "wx/log.h" |
| 27 | #include "wx/utils.h" |
| 28 | #include "wx/module.h" |
| 29 | #endif |
| 30 | |
| 31 | #include "wx/thread.h" |
| 32 | #include "wx/sound.h" |
| 33 | |
| 34 | // ---------------------------------------------------------------------------- |
| 35 | // wxSoundBackendSDL, for Unix with libSDL |
| 36 | // ---------------------------------------------------------------------------- |
| 37 | |
| 38 | class wxSoundBackendSDLNotification : public wxEvent |
| 39 | { |
| 40 | public: |
| 41 | DECLARE_DYNAMIC_CLASS(wxSoundBackendSDLNotification) |
| 42 | wxSoundBackendSDLNotification(); |
| 43 | wxEvent *Clone() const { return new wxSoundBackendSDLNotification(*this); } |
| 44 | }; |
| 45 | |
| 46 | typedef void (wxEvtHandler::*wxSoundBackendSDLNotificationFunction) |
| 47 | (wxSoundBackendSDLNotification&); |
| 48 | |
| 49 | BEGIN_DECLARE_EVENT_TYPES() |
| 50 | DECLARE_LOCAL_EVENT_TYPE(wxEVT_SOUND_BACKEND_SDL_NOTIFICATION, -1) |
| 51 | END_DECLARE_EVENT_TYPES() |
| 52 | |
| 53 | #define EVT_SOUND_BACKEND_SDL_NOTIFICATON(func) \ |
| 54 | DECLARE_EVENT_TABLE_ENTRY(wxEVT_SOUND_BACKEND_SDL_NOTIFICATION, \ |
| 55 | -1, \ |
| 56 | -1, \ |
| 57 | (wxObjectEventFunction) wxStaticCastEvent( wxSoundBackendSDLNotificationFunction, & func ), \ |
| 58 | (wxObject *) NULL ), |
| 59 | |
| 60 | IMPLEMENT_DYNAMIC_CLASS(wxSoundBackendSDLNotification, wxEvtHandler) |
| 61 | DEFINE_EVENT_TYPE(wxEVT_SOUND_BACKEND_SDL_NOTIFICATION) |
| 62 | |
| 63 | wxSoundBackendSDLNotification::wxSoundBackendSDLNotification() |
| 64 | { |
| 65 | SetEventType(wxEVT_SOUND_BACKEND_SDL_NOTIFICATION); |
| 66 | } |
| 67 | |
| 68 | class wxSoundBackendSDLEvtHandler; |
| 69 | |
| 70 | class wxSoundBackendSDL : public wxSoundBackend |
| 71 | { |
| 72 | public: |
| 73 | wxSoundBackendSDL() |
| 74 | : m_initialized(false), m_playing(false), m_audioOpen(false), |
| 75 | m_data(NULL), m_evtHandler(NULL) {} |
| 76 | virtual ~wxSoundBackendSDL(); |
| 77 | |
| 78 | wxString GetName() const { return _T("Simple DirectMedia Layer"); } |
| 79 | int GetPriority() const { return 9; } |
| 80 | bool IsAvailable() const; |
| 81 | bool HasNativeAsyncPlayback() const { return true; } |
| 82 | bool Play(wxSoundData *data, unsigned flags, |
| 83 | volatile wxSoundPlaybackStatus *status); |
| 84 | |
| 85 | void FillAudioBuffer(Uint8 *stream, int len); |
| 86 | void FinishedPlayback(); |
| 87 | |
| 88 | void Stop(); |
| 89 | bool IsPlaying() const { return m_playing; } |
| 90 | |
| 91 | private: |
| 92 | bool OpenAudio(); |
| 93 | void CloseAudio(); |
| 94 | |
| 95 | bool m_initialized; |
| 96 | bool m_playing, m_audioOpen; |
| 97 | // playback information: |
| 98 | wxSoundData *m_data; |
| 99 | unsigned m_pos; |
| 100 | SDL_AudioSpec m_spec; |
| 101 | bool m_loop; |
| 102 | |
| 103 | wxSoundBackendSDLEvtHandler *m_evtHandler; |
| 104 | }; |
| 105 | |
| 106 | class wxSoundBackendSDLEvtHandler : public wxEvtHandler |
| 107 | { |
| 108 | public: |
| 109 | wxSoundBackendSDLEvtHandler(wxSoundBackendSDL *bk) : m_backend(bk) {} |
| 110 | |
| 111 | private: |
| 112 | void OnNotify(wxSoundBackendSDLNotification& WXUNUSED(event)) |
| 113 | { |
| 114 | wxLogTrace(_T("sound"), |
| 115 | _T("received playback status change notification")); |
| 116 | m_backend->FinishedPlayback(); |
| 117 | } |
| 118 | wxSoundBackendSDL *m_backend; |
| 119 | |
| 120 | DECLARE_EVENT_TABLE() |
| 121 | }; |
| 122 | |
| 123 | BEGIN_EVENT_TABLE(wxSoundBackendSDLEvtHandler, wxEvtHandler) |
| 124 | EVT_SOUND_BACKEND_SDL_NOTIFICATON(wxSoundBackendSDLEvtHandler::OnNotify) |
| 125 | END_EVENT_TABLE() |
| 126 | |
| 127 | wxSoundBackendSDL::~wxSoundBackendSDL() |
| 128 | { |
| 129 | Stop(); |
| 130 | CloseAudio(); |
| 131 | delete m_evtHandler; |
| 132 | } |
| 133 | |
| 134 | bool wxSoundBackendSDL::IsAvailable() const |
| 135 | { |
| 136 | if (m_initialized) |
| 137 | return true; |
| 138 | if (SDL_WasInit(SDL_INIT_AUDIO) != SDL_INIT_AUDIO) |
| 139 | { |
| 140 | if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE) == -1) |
| 141 | return false; |
| 142 | } |
| 143 | wxConstCast(this, wxSoundBackendSDL)->m_initialized = true; |
| 144 | wxLogTrace(_T("sound"), _T("initialized SDL audio subsystem")); |
| 145 | return true; |
| 146 | } |
| 147 | |
| 148 | extern "C" void wx_sdl_audio_callback(void *userdata, Uint8 *stream, int len) |
| 149 | { |
| 150 | wxSoundBackendSDL *bk = (wxSoundBackendSDL*)userdata; |
| 151 | bk->FillAudioBuffer(stream, len); |
| 152 | } |
| 153 | |
| 154 | void wxSoundBackendSDL::FillAudioBuffer(Uint8 *stream, int len) |
| 155 | { |
| 156 | if (m_playing) |
| 157 | { |
| 158 | // finished playing the sample |
| 159 | if (m_pos == m_data->m_dataBytes) |
| 160 | { |
| 161 | m_playing = false; |
| 162 | wxSoundBackendSDLNotification event; |
| 163 | m_evtHandler->AddPendingEvent(event); |
| 164 | } |
| 165 | // still something to play |
| 166 | else |
| 167 | { |
| 168 | unsigned size = ((len + m_pos) < m_data->m_dataBytes) ? |
| 169 | len : |
| 170 | (m_data->m_dataBytes - m_pos); |
| 171 | memcpy(stream, m_data->m_data + m_pos, size); |
| 172 | m_pos += size; |
| 173 | len -= size; |
| 174 | stream += size; |
| 175 | } |
| 176 | } |
| 177 | // the sample doesn't play, fill the buffer with silence and wait for |
| 178 | // the main thread to shut the playback down: |
| 179 | if (len > 0) |
| 180 | { |
| 181 | if (m_loop) |
| 182 | { |
| 183 | m_pos = 0; |
| 184 | FillAudioBuffer(stream, len); |
| 185 | return; |
| 186 | } |
| 187 | else |
| 188 | { |
| 189 | memset(stream, m_spec.silence, len); |
| 190 | } |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | void wxSoundBackendSDL::FinishedPlayback() |
| 195 | { |
| 196 | if (!m_playing) |
| 197 | Stop(); |
| 198 | } |
| 199 | |
| 200 | bool wxSoundBackendSDL::OpenAudio() |
| 201 | { |
| 202 | if (!m_audioOpen) |
| 203 | { |
| 204 | if (!m_evtHandler) |
| 205 | m_evtHandler = new wxSoundBackendSDLEvtHandler(this); |
| 206 | |
| 207 | m_spec.silence = 0; |
| 208 | m_spec.samples = 4096; |
| 209 | m_spec.size = 0; |
| 210 | m_spec.callback = wx_sdl_audio_callback; |
| 211 | m_spec.userdata = (void*)this; |
| 212 | |
| 213 | wxLogTrace(_T("sound"), _T("opening SDL audio...")); |
| 214 | if (SDL_OpenAudio(&m_spec, NULL) >= 0) |
| 215 | { |
| 216 | #if wxUSE_LOG_DEBUG |
| 217 | char driver[256]; |
| 218 | SDL_AudioDriverName(driver, 256); |
| 219 | wxLogTrace(_T("sound"), _T("opened audio, driver '%s'"), |
| 220 | wxString(driver, wxConvLocal).c_str()); |
| 221 | #endif |
| 222 | m_audioOpen = true; |
| 223 | return true; |
| 224 | } |
| 225 | else |
| 226 | { |
| 227 | wxString err(SDL_GetError(), wxConvLocal); |
| 228 | wxLogError(_("Couldn't open audio: %s"), err.c_str()); |
| 229 | return false; |
| 230 | } |
| 231 | } |
| 232 | return true; |
| 233 | } |
| 234 | |
| 235 | void wxSoundBackendSDL::CloseAudio() |
| 236 | { |
| 237 | if (m_audioOpen) |
| 238 | { |
| 239 | SDL_CloseAudio(); |
| 240 | wxLogTrace(_T("sound"), _T("closed audio")); |
| 241 | m_audioOpen = false; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | bool wxSoundBackendSDL::Play(wxSoundData *data, unsigned flags, |
| 246 | volatile wxSoundPlaybackStatus *WXUNUSED(status)) |
| 247 | { |
| 248 | Stop(); |
| 249 | |
| 250 | int format; |
| 251 | if (data->m_bitsPerSample == 8) |
| 252 | format = AUDIO_U8; |
| 253 | else if (data->m_bitsPerSample == 16) |
| 254 | format = AUDIO_S16LSB; |
| 255 | else |
| 256 | return false; |
| 257 | |
| 258 | bool needsOpen = true; |
| 259 | if (m_audioOpen) |
| 260 | { |
| 261 | if (format == m_spec.format && |
| 262 | m_spec.freq == (int)data->m_samplingRate && |
| 263 | m_spec.channels == data->m_channels) |
| 264 | { |
| 265 | needsOpen = false; |
| 266 | } |
| 267 | else |
| 268 | { |
| 269 | CloseAudio(); |
| 270 | } |
| 271 | } |
| 272 | |
| 273 | if (needsOpen) |
| 274 | { |
| 275 | m_spec.format = format; |
| 276 | m_spec.freq = data->m_samplingRate; |
| 277 | m_spec.channels = data->m_channels; |
| 278 | if (!OpenAudio()) |
| 279 | return false; |
| 280 | } |
| 281 | |
| 282 | SDL_LockAudio(); |
| 283 | wxLogTrace(_T("sound"), _T("playing new sound")); |
| 284 | m_playing = true; |
| 285 | m_pos = 0; |
| 286 | m_loop = (flags & wxSOUND_LOOP); |
| 287 | m_data = data; |
| 288 | data->IncRef(); |
| 289 | SDL_UnlockAudio(); |
| 290 | |
| 291 | SDL_PauseAudio(0); |
| 292 | |
| 293 | // wait until playback finishes if called in sync mode: |
| 294 | if (!(flags & wxSOUND_ASYNC)) |
| 295 | { |
| 296 | wxLogTrace(_T("sound"), _T("waiting for sample to finish")); |
| 297 | while (m_playing && m_data == data) |
| 298 | { |
| 299 | #if wxUSE_THREADS |
| 300 | // give the playback thread a chance to add event to pending |
| 301 | // events queue, release GUI lock temporarily: |
| 302 | if (wxThread::IsMain()) |
| 303 | wxMutexGuiLeave(); |
| 304 | #endif |
| 305 | wxMilliSleep(10); |
| 306 | #if wxUSE_THREADS |
| 307 | if (wxThread::IsMain()) |
| 308 | wxMutexGuiEnter(); |
| 309 | #endif |
| 310 | } |
| 311 | wxLogTrace(_T("sound"), _T("sample finished")); |
| 312 | } |
| 313 | |
| 314 | return true; |
| 315 | } |
| 316 | |
| 317 | void wxSoundBackendSDL::Stop() |
| 318 | { |
| 319 | SDL_LockAudio(); |
| 320 | SDL_PauseAudio(1); |
| 321 | m_playing = false; |
| 322 | if (m_data) |
| 323 | { |
| 324 | m_data->DecRef(); |
| 325 | m_data = NULL; |
| 326 | } |
| 327 | SDL_UnlockAudio(); |
| 328 | } |
| 329 | |
| 330 | extern "C" wxSoundBackend *wxCreateSoundBackendSDL() |
| 331 | { |
| 332 | return new wxSoundBackendSDL(); |
| 333 | } |
| 334 | |
| 335 | #endif // wxUSE_SOUND && wxUSE_LIBSDL |