utils/wxMMedia2/lib/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 #include "sndbase.h"
  14
  15
  16 // ---------------------------------------------------------------------------
  17 // wxSoundFormatBase
  18 // ---------------------------------------------------------------------------
  19
  20 wxSoundFormatBase::wxSoundFormatBase()
  21 {
  22 }
  23
  24 wxSoundFormatBase::~wxSoundFormatBase()
  25 {
  26 }
  27
  28 wxSoundFormatBase *wxSoundFormatBase::Clone() const
  29 {
  30   return NULL;
  31 }
  32
  33 bool wxSoundFormatBase::operator!=(const wxSoundFormatBase& frmt2) const
  34 {
  35   return (GetType() != frmt2.GetType());
  36 }
  37
  38 // ---------------------------------------------------------------------------
  39 // wxSoundStream
  40 // ---------------------------------------------------------------------------
  41
  42 wxSoundStream::wxSoundStream()
  43 {
  44   int i;
  45
  46   // Reset all variables to their neutral value.
  47   m_sndformat = NULL;
  48   m_handler = NULL;
  49   m_snderror = wxSOUND_NOERR;
  50   m_lastcount = 0;
  51   for (i=0;i<2;i++)
  52     m_callback[i] = NULL;
  53 }
  54
  55 wxSoundStream::~wxSoundStream()
  56 {
  57   if (m_sndformat)
  58     delete m_sndformat;
  59 }
  60
  61 // --------------------------------------------------------------------------
  62 // SetSoundFormat(const wxSoundFormatBase& format) is one of the most
  63 // important function of the wxSoundStream class. It prepares the stream to
  64 // receive or send the data in a strict format. Normally, the sound stream
  65 // should be ready to accept any format it is asked to manage but in certain
  66 // cases, it really cannot: in that case it returns FALSE. To have more
  67 // details in the functionnalities of SetSoundFormat see
  68 // wxSoundRouterStream::SetSoundFormat()
  69 // --------------------------------------------------------------------------
  70 bool wxSoundStream::SetSoundFormat(const wxSoundFormatBase& format)
  71 {
  72   // delete the previous prepared format
  73   if (m_sndformat)
  74     delete m_sndformat;
  75
  76   // create a new one by cloning the format passed in parameter
  77   m_sndformat = format.Clone();
  78   return TRUE;
  79 }
  80
  81
  82 // --------------------------------------------------------------------------
  83 // Register(int evt, ...) registers the callback for a specified async event.
  84 // Warning ! Only one callback by event is supported. It means that if you
  85 // call twice this function the previous registered callback is absolutely
  86 // ignored.
  87 // --------------------------------------------------------------------------
  88 void wxSoundStream::Register(int evt, wxSoundCallback cbk, char *cdata)
  89 {
  90   int c;
  91
  92   switch (evt) {
  93   case wxSOUND_INPUT:
  94     c = 0;
  95     break;
  96   case wxSOUND_OUTPUT:
  97     c = 1;
  98     break;
  99   default:
 100     return;
 101   }
 102   m_callback[c] = cbk;
 103   m_cdata[c] = cdata;
 104 }
 105
 106 // --------------------------------------------------------------------------
 107 // OnSoundEvent(int evt) is called either when the driver is ready to receive
 108 // a new block to play or when the driver has a new recorded buffer. You
 109 // must be careful here and try not to spend a lot of time: this is a
 110 // real-time call. In the case, an "event handler" was specified previously,
 111 // it called him before everything.
 112 // --------------------------------------------------------------------------
 113 void wxSoundStream::OnSoundEvent(int evt)
 114 {
 115   int c;
 116
 117   if (m_handler) {
 118     m_handler->OnSoundEvent(evt);
 119     return;
 120   }
 121
 122   switch (evt) {
 123   case wxSOUND_INPUT:
 124     c = 0;
 125     break;
 126   case wxSOUND_OUTPUT:
 127     c = 1;
 128     break;
 129   default:
 130     return;
 131   }
 132   if (m_callback[c])
 133     m_callback[c](this, evt, m_cdata[c]);
 134 }