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