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
  14 #ifndef WX_PRECOMP
  15 #endif
  16
  17 #include "sndbase.h"
  18 #include "sndfile.h"
  19 #include "sndpcm.h"
  20 #include "sndulaw.h"
  21 #include "g72x.h"
  22
  23 // --------------------------------------------------------------------------
  24 // wxSoundFormatUlaw
  25 // --------------------------------------------------------------------------
  26
  27 wxSoundFormatUlaw::wxSoundFormatUlaw()
  28   : m_srate(22050)
  29 {
  30 }
  31
  32 wxSoundFormatUlaw::~wxSoundFormatUlaw()
  33 {
  34 }
  35
  36 void wxSoundFormatUlaw::SetSampleRate(wxUint32 srate)
  37 {
  38   m_srate = srate;
  39 }
  40
  41 wxUint32 wxSoundFormatUlaw::GetSampleRate() const
  42 {
  43   return m_srate;
  44 }
  45
  46 wxSoundFormatBase *wxSoundFormatUlaw::Clone() const
  47 {
  48   wxSoundFormatUlaw *ulaw = new wxSoundFormatUlaw();
  49
  50   ulaw->m_srate = m_srate;
  51   return ulaw;
  52 }
  53
  54 wxUint32 wxSoundFormatUlaw::GetTimeFromBytes(wxUint32 bytes) const
  55 {
  56   return (bytes / m_srate);
  57 }
  58
  59 wxUint32 wxSoundFormatUlaw::GetBytesFromTime(wxUint32 time) const
  60 {
  61   return time * m_srate;
  62 }
  63
  64 bool wxSoundFormatUlaw::operator !=(const wxSoundFormatBase& frmt2) const
  65 {
  66   wxSoundFormatUlaw *ulaw = (wxSoundFormatUlaw *)&frmt2;
  67
  68   if (frmt2.GetType() != wxSOUND_ULAW)
  69     return TRUE;
  70
  71   return (ulaw->m_srate != m_srate);
  72 }
  73
  74 // --------------------------------------------------------------------------
  75 // wxSoundStreamUlaw
  76 // --------------------------------------------------------------------------
  77 wxSoundStreamUlaw::wxSoundStreamUlaw(wxSoundStream& sndio)
  78  : wxSoundStreamCodec(sndio)
  79 {
  80   // PCM converter
  81   m_router = new wxSoundRouterStream(sndio);
  82 }
  83
  84 wxSoundStreamUlaw::~wxSoundStreamUlaw()
  85 {
  86   delete m_router;
  87 }
  88
  89 wxSoundStream& wxSoundStreamUlaw::Read(void *buffer, wxUint32 len)
  90 {
  91     // TODO
  92     return *this;
  93 }
  94
  95 wxSoundStream& wxSoundStreamUlaw::Write(const void *buffer, wxUint32 len)
  96 {
  97   wxUint16 *old_linear;
  98   register wxUint16 *linear_buffer;
  99   register const wxUint8 *ulaw_buffer;
 100   register wxUint32 countdown = len;
 101
 102   old_linear = linear_buffer = new wxUint16[len*2];
 103   ulaw_buffer = (const wxUint8 *)buffer;
 104
 105   while (countdown != 0) {
 106     *linear_buffer++ = ulaw2linear(*ulaw_buffer++);
 107     countdown--;
 108   }
 109
 110   m_router->Write(old_linear, len * 2);
 111
 112   delete[] old_linear;
 113
 114   return *m_router;
 115 }
 116
 117 wxUint32 wxSoundStreamUlaw::GetBestSize() const
 118 {
 119   return m_sndio->GetBestSize() / 2;
 120 }
 121
 122 bool wxSoundStreamUlaw::SetSoundFormat(const wxSoundFormatBase& format)
 123 {
 124   if (format.GetType() != wxSOUND_ULAW) {
 125     m_snderror = wxSOUND_INVFRMT;
 126     return FALSE;
 127   }
 128
 129   wxSoundFormatPcm pcm;
 130   wxSoundFormatUlaw *ulaw;
 131
 132   wxSoundStreamCodec::SetSoundFormat(format);
 133
 134   ulaw = (wxSoundFormatUlaw *)m_sndformat;
 135
 136   pcm.SetSampleRate(ulaw->GetSampleRate());
 137   pcm.SetBPS(16);
 138   pcm.SetChannels(1);
 139   pcm.Signed(TRUE);
 140   pcm.SetOrder(wxBYTE_ORDER);
 141
 142   m_router->SetSoundFormat(pcm);
 143
 144   return TRUE;
 145 }