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 <wx/wxprec.h>
  13 #include "sndbase.h"
  14 #include "sndfile.h"
  15 #include "sndpcm.h"
  16 #include "sndulaw.h"
  17 #include "g72x.h"
  18
  19 // --------------------------------------------------------------------------
  20 // wxSoundFormatUlaw
  21 // --------------------------------------------------------------------------
  22
  23 wxSoundFormatUlaw::wxSoundFormatUlaw()
  24   : m_srate(22050)
  25 {
  26 }
  27
  28 wxSoundFormatUlaw::~wxSoundFormatUlaw()
  29 {
  30 }
  31
  32 void wxSoundFormatUlaw::SetSampleRate(wxUint32 srate)
  33 {
  34   m_srate = srate;
  35 }
  36
  37 wxUint32 wxSoundFormatUlaw::GetSampleRate() const
  38 {
  39   return m_srate;
  40 }
  41
  42 wxSoundFormatBase *wxSoundFormatUlaw::Clone() const
  43 {
  44   wxSoundFormatUlaw *ulaw = new wxSoundFormatUlaw();
  45
  46   ulaw->m_srate = m_srate;
  47   return ulaw;
  48 }
  49
  50 wxUint32 wxSoundFormatUlaw::GetTimeFromBytes(wxUint32 bytes) const
  51 {
  52   return (bytes / m_srate);
  53 }
  54
  55 wxUint32 wxSoundFormatUlaw::GetBytesFromTime(wxUint32 time) const
  56 {
  57   return time * m_srate;
  58 }
  59
  60 bool wxSoundFormatUlaw::operator !=(const wxSoundFormatBase& frmt2) const
  61 {
  62   wxSoundFormatUlaw *ulaw = (wxSoundFormatUlaw *)&frmt2;
  63
  64   if (frmt2.GetType() != wxSOUND_ULAW)
  65     return TRUE;
  66
  67   return (ulaw->m_srate != m_srate);
  68 }
  69
  70 // --------------------------------------------------------------------------
  71 // wxSoundStreamUlaw
  72 // --------------------------------------------------------------------------
  73 wxSoundStreamUlaw::wxSoundStreamUlaw(wxSoundStream& sndio)
  74  : wxSoundStreamCodec(sndio)
  75 {
  76   // PCM converter
  77   m_router = new wxSoundRouterStream(sndio);
  78 }
  79
  80 wxSoundStreamUlaw::~wxSoundStreamUlaw()
  81 {
  82   delete m_router;
  83 }
  84
  85 wxSoundStream& wxSoundStreamUlaw::Read(void *buffer, wxUint32 len)
  86 {
  87   return *this;
  88 }
  89
  90 wxSoundStream& wxSoundStreamUlaw::Write(const void *buffer, wxUint32 len)
  91 {
  92   wxUint16 *old_linear;
  93   register wxUint16 *linear_buffer;
  94   register const wxUint8 *ulaw_buffer;
  95   register wxUint32 countdown = len;
  96
  97   old_linear = linear_buffer = new wxUint16[len*2];
  98   ulaw_buffer = (const wxUint8 *)buffer;
  99
 100   while (countdown != 0) {
 101     *linear_buffer++ = ulaw2linear(*ulaw_buffer++);
 102     countdown--;
 103   }
 104
 105   m_router->Write(old_linear, len * 2);
 106
 107   delete[] old_linear;
 108
 109   return *m_router;
 110 }
 111
 112 wxUint32 wxSoundStreamUlaw::GetBestSize() const
 113 {
 114   return m_sndio->GetBestSize() / 2;
 115 }
 116
 117 bool wxSoundStreamUlaw::SetSoundFormat(const wxSoundFormatBase& format)
 118 {
 119   if (format.GetType() != wxSOUND_ULAW) {
 120     m_snderror = wxSOUND_INVFRMT;
 121     return FALSE;
 122   }
 123
 124   wxSoundFormatPcm pcm;
 125   wxSoundFormatUlaw *ulaw;
 126
 127   wxSoundStreamCodec::SetSoundFormat(format);
 128
 129   ulaw = (wxSoundFormatUlaw *)m_sndformat;
 130
 131   pcm.SetSampleRate(ulaw->GetSampleRate());
 132   pcm.SetBPS(16);
 133   pcm.SetChannels(1);
 134   pcm.Signed(TRUE);
 135   pcm.SetOrder(wxBYTE_ORDER);
 136
 137   m_router->SetSoundFormat(pcm);
 138
 139   return TRUE;
 140 }