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