contrib/src/mmedia/sndbase.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndbase.cpp
   3 // Purpose:
   4 // Date: 08/11/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999, 2000
   6 // CVSID: $Id$
   7 // wxWindows licence
   8 // --------------------------------------------------------------------------
   9 #ifdef __GNUG__
  10 #pragma implementation "sndbase.cpp"
  11 #endif
  12
  13 #include "wx/wxprec.h"
  14
  15 #ifndef WX_PRECOMP
  16 #include "wx/defs.h"
  17 #include "wx/string.h"
  18 #include "wx/log.h"
  19 #endif
  20
  21 #include "wx/mmedia/sndbase.h"
  22
  23
  24 // ---------------------------------------------------------------------------
  25 // wxSoundFormatBase
  26 // ---------------------------------------------------------------------------
  27
  28 wxSoundFormatBase::wxSoundFormatBase()
  29 {
  30 }
  31
  32 wxSoundFormatBase::~wxSoundFormatBase()
  33 {
  34 }
  35
  36 wxSoundFormatBase *wxSoundFormatBase::Clone() const
  37 {
  38     wxLogFatalError(wxT("In wxSoundFormatBase::Clone() but I should")
  39                     wxT(" not be there"));
  40     return NULL;
  41 }
  42
  43 bool wxSoundFormatBase::operator!=(const wxSoundFormatBase& frmt2) const
  44 {
  45     return (GetType() != frmt2.GetType());
  46 }
  47
  48 // ---------------------------------------------------------------------------
  49 // wxSoundStream
  50 // ---------------------------------------------------------------------------
  51
  52 wxSoundStream::wxSoundStream()
  53 {
  54     int i;
  55
  56     // Reset all variables to their neutral value.
  57     m_sndformat = NULL;
  58     m_handler = NULL;
  59     m_snderror = wxSOUND_NOERROR;
  60     m_lastcount = 0;
  61     for (i=0;i<2;i++)
  62         m_callback[i] = NULL;
  63 }
  64
  65 wxSoundStream::~wxSoundStream()
  66 {
  67   if (m_sndformat)
  68       delete m_sndformat;
  69 }
  70
  71 // --------------------------------------------------------------------------
  72 // SetSoundFormat(const wxSoundFormatBase& format) is one of the most
  73 // important function of the wxSoundStream class. It prepares the stream to
  74 // receive or send the data in a strict format. Normally, the sound stream
  75 // should be ready to accept any format it is asked to manage but in certain
  76 // cases, it really cannot: in that case it returns false. To have more
  77 // details in the functionnalities of SetSoundFormat see
  78 // wxSoundRouterStream::SetSoundFormat()
  79 // --------------------------------------------------------------------------
  80 bool wxSoundStream::SetSoundFormat(const wxSoundFormatBase& format)
  81 {
  82     // delete the previous prepared format
  83     if (m_sndformat)
  84       delete m_sndformat;
  85
  86     // create a new one by cloning the format passed in parameter
  87     m_sndformat = format.Clone();
  88     return true;
  89 }
  90
  91
  92 // --------------------------------------------------------------------------
  93 // Register(int evt, ...) registers the callback for a specified async event.
  94 // Warning ! Only one callback by event is supported. It means that if you
  95 // call twice this function the previous registered callback is absolutely
  96 // ignored.
  97 // --------------------------------------------------------------------------
  98 void wxSoundStream::SetCallback(int evt, wxSoundCallback cbk, void *cdata)
  99 {
 100   int c;
 101
 102   switch (evt) {
 103   case wxSOUND_INPUT:
 104     c = 0;
 105     break;
 106   case wxSOUND_OUTPUT:
 107     c = 1;
 108     break;
 109   default:
 110     return;
 111   }
 112   m_callback[c] = cbk;
 113   m_cdata[c] = cdata;
 114 }
 115
 116 // --------------------------------------------------------------------------
 117 // OnSoundEvent(int evt) is called either when the driver is ready to receive
 118 // a new block to play or when the driver has a new recorded buffer. You
 119 // must be careful here and try not to spend a lot of time: this is a
 120 // real-time call. In the case, an "event handler" was specified previously,
 121 // it called him before everything.
 122 // --------------------------------------------------------------------------
 123 void wxSoundStream::OnSoundEvent(int evt)
 124 {
 125   int c;
 126
 127   if (m_handler) {
 128     m_handler->OnSoundEvent(evt);
 129     return;
 130   }
 131
 132   switch (evt) {
 133   case wxSOUND_INPUT:
 134     c = 0;
 135     break;
 136   case wxSOUND_OUTPUT:
 137     c = 1;
 138     break;
 139   default:
 140     return;
 141   }
 142   if (m_callback[c])
 143     m_callback[c](this, evt, m_cdata[c]);
 144 }