utils/wxMMedia2/lib/sndulaw.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndulaw.cpp
   3 // Purpose:
   4 // Date: 08/11/1999
   5 // Author: Guilhem Lavaux <lavaux@easynet.fr> (C) 1999
   6 // CVSID: $Id$
   7 // --------------------------------------------------------------------------
   8 #ifdef __GNUG__
   9 #pragma implementation "sndulaw.cpp"
  10 #endif
  11
  12 #include "sndbase.h"
  13 #include "sndfile.h"
  14 #include "sndpcm.h"
  15 #include "sndulaw.h"
  16 #include "g72x.h"
  17
  18 // --------------------------------------------------------------------------
  19 // wxSoundFormatUlaw
  20 // --------------------------------------------------------------------------
  21
  22 wxSoundFormatUlaw::wxSoundFormatUlaw()
  23   : m_srate(22050)
  24 {
  25 }
  26
  27 wxSoundFormatUlaw::~wxSoundFormatUlaw()
  28 {
  29 }
  30
  31 void wxSoundFormatUlaw::SetSampleRate(wxUint32 srate)
  32 {
  33   m_srate = srate;
  34 }
  35
  36 wxUint32 wxSoundFormatUlaw::GetSampleRate() const
  37 {
  38   return m_srate;
  39 }
  40
  41 wxSoundFormatBase *wxSoundFormatUlaw::Clone() const
  42 {
  43   wxSoundFormatUlaw *ulaw = new wxSoundFormatUlaw();
  44
  45   ulaw->m_srate = m_srate;
  46   return ulaw;
  47 }
  48
  49 wxUint32 wxSoundFormatUlaw::GetTimeFromByte(wxUint32 bytes) const
  50 {
  51   return (bytes / m_srate);
  52 }
  53
  54 wxUint32 wxSoundFormatUlaw::GetByteFromTime(wxUint32 time) const
  55 {
  56   return time * m_srate;
  57 }
  58
  59 bool wxSoundFormatUlaw::operator !=(const wxSoundFormatBase& frmt2) const
  60 {
  61   wxSoundFormatUlaw *ulaw = (wxSoundFormatUlaw *)&frmt2;
  62
  63   if (frmt2.GetType() != wxSOUND_ULAW)
  64     return TRUE;
  65
  66   return (ulaw->m_srate != m_srate);
  67 }
  68
  69 // --------------------------------------------------------------------------
  70 // wxSoundStreamUlaw
  71 // --------------------------------------------------------------------------
  72 wxSoundStreamUlaw::wxSoundStreamUlaw(wxSoundStream& sndio)
  73  : wxSoundStreamCodec(sndio)
  74 {
  75   // PCM converter
  76   m_router = new wxSoundRouterStream(sndio);
  77 }
  78
  79 wxSoundStreamUlaw::~wxSoundStreamUlaw()
  80 {
  81   delete m_router;
  82 }
  83
  84 wxSoundStream& wxSoundStreamUlaw::Read(void *buffer, size_t len)
  85 {
  86   return *this;
  87 }
  88
  89 wxSoundStream& wxSoundStreamUlaw::Write(const void *buffer, size_t len)
  90 {
  91   wxUint16 *old_linear;
  92   register wxUint16 *linear_buffer;
  93   register const wxUint8 *ulaw_buffer;
  94   register size_t countdown = len;
  95
  96   old_linear = linear_buffer = new wxUint16[len*2];
  97   ulaw_buffer = (const wxUint8 *)buffer;
  98
  99   while (countdown != 0) {
 100     *linear_buffer++ = ulaw2linear(*ulaw_buffer++);
 101     countdown--;
 102   }
 103
 104   m_router->Write(old_linear, len * 2);
 105
 106   delete[] old_linear;
 107
 108   return *m_router;
 109 }
 110
 111 bool wxSoundStreamUlaw::SetSoundFormat(const wxSoundFormatBase& format)
 112 {
 113   if (format.GetType() != wxSOUND_ULAW) {
 114     m_snderror = wxSOUND_INVFRMT;
 115     return FALSE;
 116   }
 117
 118   wxSoundFormatPcm pcm;
 119   wxSoundFormatUlaw *ulaw;
 120
 121   wxSoundStreamCodec::SetSoundFormat(format);
 122
 123   ulaw = (wxSoundFormatUlaw *)m_sndformat;
 124
 125   pcm.SetSampleRate(ulaw->GetSampleRate());
 126   pcm.SetBPS(16);
 127   pcm.SetChannels(1);
 128   pcm.Signed(TRUE);
 129   pcm.SetOrder(wxBYTE_ORDER);
 130
 131   m_router->SetSoundFormat(pcm);
 132
 133   return TRUE;
 134 }