contrib/src/mmedia/sndoss.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndoss.cpp
   3 // Purpose:
   4 // Date: 08/11/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999, 2000
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifdef __GNUG__
   9 #pragma implementation "sndoss.cpp"
  10 #endif
  11
  12 // --------------------------------------------------------------------------
  13 // System dependent headers
  14 // --------------------------------------------------------------------------
  15
  16 #include <sys/soundcard.h>
  17 #include <sys/types.h>
  18 #include <sys/stat.h>
  19 #include <sys/ioctl.h>
  20 #include <fcntl.h>
  21 #include <unistd.h>
  22 #ifdef __WXGTK__
  23 #include <gdk/gdk.h>
  24 #endif
  25
  26 // --------------------------------------------------------------------------
  27 // wxWidgets headers
  28 // --------------------------------------------------------------------------
  29 #include "wx/defs.h"
  30 #include "wx/string.h"
  31 #include "wx/mmedia/sndbase.h"
  32 #include "wx/mmedia/sndoss.h"
  33 #include "wx/mmedia/sndpcm.h"
  34
  35 wxSoundStreamOSS::wxSoundStreamOSS(const wxString& dev_name)
  36 {
  37     wxSoundFormatPcm pcm_default;
  38
  39     // Open the OSS device
  40     m_fd = open(dev_name.mb_str(), O_WRONLY);
  41     if (m_fd == -1) {
  42         // OSS not found
  43         m_oss_ok   = false;
  44         m_snderror = wxSOUND_INVDEV;
  45         return;
  46     }
  47
  48     // Remember the device name
  49     m_devname = dev_name;
  50
  51     // Initialize the default format
  52     wxSoundStreamOSS::SetSoundFormat(pcm_default);
  53
  54     // Get the default best size for OSS
  55     ioctl(m_fd, SNDCTL_DSP_GETBLKSIZE, &m_bufsize);
  56
  57     m_snderror = wxSOUND_NOERROR;
  58
  59     // Close OSS
  60     close(m_fd);
  61
  62     m_oss_ok   = true;
  63     m_oss_stop = true;
  64     m_q_filled = true;
  65 }
  66
  67 wxSoundStreamOSS::~wxSoundStreamOSS()
  68 {
  69     if (m_fd > 0)
  70         close(m_fd);
  71 }
  72
  73 wxUint32 wxSoundStreamOSS::GetBestSize() const
  74 {
  75     return m_bufsize;
  76 }
  77
  78 wxSoundStream& wxSoundStreamOSS::Read(void *buffer, wxUint32 len)
  79 {
  80     int ret;
  81
  82     if (m_oss_stop) {
  83         m_snderror = wxSOUND_NOTSTARTED;
  84         m_lastcount = 0;
  85         return *this;
  86     }
  87
  88     m_lastcount = (wxUint32)ret = read(m_fd, buffer, len);
  89     m_q_filled  = true;
  90
  91     if (ret < 0)
  92         m_snderror = wxSOUND_IOERROR;
  93     else
  94         m_snderror = wxSOUND_NOERROR;
  95
  96     return *this;
  97 }
  98
  99 wxSoundStream& wxSoundStreamOSS::Write(const void *buffer, wxUint32 len)
 100 {
 101     int ret;
 102
 103     if (m_oss_stop) {
 104         m_snderror = wxSOUND_NOTSTARTED;
 105         m_lastcount= 0;
 106         return *this;
 107     }
 108
 109     ret = write(m_fd, buffer, len);
 110     m_q_filled = true;
 111
 112     if (ret < 0) {
 113         m_lastcount = 0;
 114         m_snderror  = wxSOUND_IOERROR;
 115     } else {
 116         m_snderror = wxSOUND_NOERROR;
 117         m_lastcount = (wxUint32)ret;
 118     }
 119
 120     return *this;
 121 }
 122
 123 bool wxSoundStreamOSS::SetSoundFormat(const wxSoundFormatBase& format)
 124 {
 125     int tmp;
 126     wxSoundFormatPcm *pcm_format;
 127
 128     if (format.GetType() != wxSOUND_PCM) {
 129         m_snderror = wxSOUND_INVFRMT;
 130         return false;
 131     }
 132
 133     if (!m_oss_ok) {
 134         m_snderror = wxSOUND_INVDEV;
 135         return false;
 136     }
 137
 138     if (m_sndformat)
 139         delete m_sndformat;
 140
 141     m_sndformat = format.Clone();
 142     if (!m_sndformat) {
 143         m_snderror = wxSOUND_MEMERROR;
 144         return false;
 145     }
 146     pcm_format = (wxSoundFormatPcm *)m_sndformat;
 147
 148     // We temporary open the OSS device
 149     if (m_oss_stop) {
 150         m_fd = open(m_devname.mb_str(), O_WRONLY);
 151         if (m_fd == -1) {
 152             m_snderror = wxSOUND_INVDEV;
 153             return false;
 154         }
 155     }
 156
 157     // Set the sample rate field.
 158     tmp = pcm_format->GetSampleRate();
 159     ioctl(m_fd, SNDCTL_DSP_SPEED, &tmp);
 160
 161     pcm_format->SetSampleRate(tmp);
 162
 163     // Detect the best format
 164     DetectBest(pcm_format);
 165     // Try to apply it
 166     SetupFormat(pcm_format);
 167
 168     tmp = pcm_format->GetChannels();
 169     ioctl(m_fd, SNDCTL_DSP_CHANNELS, &tmp);
 170     pcm_format->SetChannels(tmp);
 171
 172     // Close the OSS device
 173     if (m_oss_stop)
 174         close(m_fd);
 175
 176     m_snderror = wxSOUND_NOERROR;
 177     if (*pcm_format != format) {
 178         m_snderror = wxSOUND_NOEXACT;
 179         return false;
 180     }
 181
 182     return true;
 183 }
 184
 185 bool wxSoundStreamOSS::SetupFormat(wxSoundFormatPcm *pcm_format)
 186 {
 187     int tmp;
 188
 189     switch(pcm_format->GetBPS()) {
 190         case 8:
 191             if (pcm_format->Signed())
 192                 tmp = AFMT_S8;
 193             else
 194                 tmp = AFMT_U8;
 195             break;
 196         case 16:
 197             switch (pcm_format->GetOrder()) {
 198                 case wxBIG_ENDIAN:
 199                     if (pcm_format->Signed())
 200                         tmp = AFMT_S16_BE;
 201                     else
 202                         tmp = AFMT_U16_BE;
 203                     break;
 204                 case wxLITTLE_ENDIAN:
 205                     if (pcm_format->Signed())
 206                         tmp = AFMT_S16_LE;
 207                     else
 208                         tmp = AFMT_U16_LE;
 209                     break;
 210             }
 211             break;
 212     }
 213
 214     ioctl(m_fd, SNDCTL_DSP_SETFMT, &tmp);
 215
 216     // Demangling.
 217     switch (tmp) {
 218         case AFMT_U8:
 219             pcm_format->SetBPS(8);
 220             pcm_format->Signed(false);
 221             break;
 222         case AFMT_S8:
 223             pcm_format->SetBPS(8);
 224             pcm_format->Signed(true);
 225             break;
 226         case AFMT_U16_LE:
 227             pcm_format->SetBPS(16);
 228             pcm_format->Signed(false);
 229             pcm_format->SetOrder(wxLITTLE_ENDIAN);
 230             break;
 231         case AFMT_U16_BE:
 232             pcm_format->SetBPS(16);
 233             pcm_format->Signed(false);
 234             pcm_format->SetOrder(wxBIG_ENDIAN);
 235             break;
 236         case AFMT_S16_LE:
 237             pcm_format->SetBPS(16);
 238             pcm_format->Signed(true);
 239             pcm_format->SetOrder(wxLITTLE_ENDIAN);
 240             break;
 241         case AFMT_S16_BE:
 242             pcm_format->SetBPS(16);
 243             pcm_format->Signed(true);
 244             pcm_format->SetOrder(wxBIG_ENDIAN);
 245             break;
 246     }
 247     return true;
 248 }
 249
 250 #ifdef __WXGTK__
 251 static void _wxSound_OSS_CBack(gpointer data, int source,
 252                                GdkInputCondition condition)
 253 {
 254     wxSoundStreamOSS *oss = (wxSoundStreamOSS *)data;
 255
 256     switch (condition) {
 257         case GDK_INPUT_READ:
 258             oss->WakeUpEvt(wxSOUND_INPUT);
 259             break;
 260         case GDK_INPUT_WRITE:
 261             oss->WakeUpEvt(wxSOUND_OUTPUT);
 262             break;
 263         default:
 264             break;
 265     }
 266 }
 267 #endif
 268
 269 void wxSoundStreamOSS::WakeUpEvt(int evt)
 270 {
 271     m_q_filled = false;
 272     OnSoundEvent(evt);
 273 }
 274
 275 bool wxSoundStreamOSS::StartProduction(int evt)
 276 {
 277     wxSoundFormatBase *old_frmt;
 278
 279     if (!m_oss_stop)
 280         StopProduction();
 281
 282     old_frmt = m_sndformat->Clone();
 283     if (!old_frmt) {
 284         m_snderror = wxSOUND_MEMERROR;
 285         return false;
 286     }
 287
 288     if (evt == wxSOUND_OUTPUT)
 289         m_fd = open(m_devname.mb_str(), O_WRONLY);
 290     else if (evt == wxSOUND_INPUT)
 291         m_fd = open(m_devname.mb_str(), O_RDONLY);
 292
 293     if (m_fd == -1) {
 294         m_snderror = wxSOUND_INVDEV;
 295         return false;
 296     }
 297
 298     SetSoundFormat(*old_frmt);
 299     delete old_frmt;
 300
 301     int trig;
 302
 303     if (evt == wxSOUND_OUTPUT) {
 304 #ifdef __WXGTK__
 305         m_tag = gdk_input_add(m_fd, GDK_INPUT_WRITE, _wxSound_OSS_CBack, (gpointer)this);
 306 #endif
 307         trig = PCM_ENABLE_OUTPUT;
 308     } else {
 309 #ifdef __WXGTK__
 310         m_tag = gdk_input_add(m_fd, GDK_INPUT_READ, _wxSound_OSS_CBack, (gpointer)this);
 311 #endif
 312         trig = PCM_ENABLE_INPUT;
 313     }
 314
 315   ioctl(m_fd, SNDCTL_DSP_SETTRIGGER, &trig);
 316
 317   m_oss_stop = false;
 318   m_q_filled = false;
 319
 320   return true;
 321 }
 322
 323 bool wxSoundStreamOSS::StopProduction()
 324 {
 325   if (m_oss_stop)
 326     return false;
 327
 328 #ifdef __WXGTK__
 329   gdk_input_remove(m_tag);
 330 #endif
 331
 332   close(m_fd);
 333   m_oss_stop = true;
 334   m_q_filled = true;
 335   return true;
 336 }
 337
 338 bool wxSoundStreamOSS::QueueFilled() const
 339 {
 340   return m_q_filled;
 341 }
 342
 343 //
 344 // Detect the closest format (The best).
 345 //
 346 void wxSoundStreamOSS::DetectBest(wxSoundFormatPcm *pcm)
 347 {
 348 #define MASK_16BITS (AFMT_S16_LE | AFMT_S16_BE | AFMT_U16_LE | AFMT_U16_BE)
 349
 350   int fmt_mask;
 351   wxSoundFormatPcm best_pcm;
 352
 353   // We change neither the number of channels nor the sample rate
 354
 355   best_pcm.SetSampleRate(pcm->GetSampleRate());
 356   best_pcm.SetChannels(pcm->GetChannels());
 357
 358   // Get the supported format by the sound card
 359   ioctl(m_fd, SNDCTL_DSP_GETFMTS, &fmt_mask);
 360
 361   // It supports 16 bits
 362   if (pcm->GetBPS() == 16 && ((fmt_mask & MASK_16BITS) != 0))
 363     best_pcm.SetBPS(16);
 364
 365   // It supports big endianness
 366   if (pcm->GetOrder() == wxBIG_ENDIAN &&
 367       ((fmt_mask & (AFMT_S16_BE | AFMT_U16_BE)) != 0))
 368     best_pcm.SetOrder(wxBIG_ENDIAN);
 369
 370   // It supports little endianness
 371   if (pcm->GetOrder() == wxLITTLE_ENDIAN &&
 372       ((fmt_mask & (AFMT_S16_LE | AFMT_U16_LE)) != 0))
 373     best_pcm.SetOrder(wxLITTLE_ENDIAN);
 374
 375   // It supports signed samples
 376   if (pcm->Signed() &&
 377       ((fmt_mask & (AFMT_S16_LE | AFMT_S16_BE | AFMT_S8)) != 0))
 378     best_pcm.Signed(true);
 379
 380   // It supports unsigned samples
 381   if (!pcm->Signed() &&
 382       ((fmt_mask & (AFMT_U16_LE | AFMT_U16_BE | AFMT_U8)) != 0))
 383     best_pcm.Signed(false);
 384
 385   // Finally recopy the new format
 386   *pcm = best_pcm;
 387 }