utils/wxMMedia/sndau.cpp

   1 // /////////////////////////////////////////////////////////////////////////////
   2 // Name:       sndau.cpp
   3 // Purpose:    wxMMedia Sun Audio File Codec
   4 // Author:     Guilhem Lavaux
   5 // Created:    1998
   6 // Updated:
   7 // Copyright:  (C) 1998, Guilhem Lavaux
   8 // License:    wxWindows license
   9 // /////////////////////////////////////////////////////////////////////////////
  10 #ifdef __GNUG__
  11 #pragma implementation "sndau.h"
  12 #endif
  13
  14 #include "mmriff.h"
  15 #include "sndfile.h"
  16 #include "sndau.h"
  17
  18 #define AU_ISDN_ULAW 1
  19 #define AU_PCM_8BITS 2
  20 #define AU_PCM_16BITS 3
  21 #define AU_ADPCM 23
  22
  23 wxSndAuCodec::wxSndAuCodec()
  24   : wxSndFileCodec()
  25 {
  26 }
  27
  28 wxSndAuCodec::wxSndAuCodec(wxInputStream& s, bool preload, bool seekable)
  29   : wxSndFileCodec(s, preload, seekable)
  30 {
  31 }
  32
  33 wxSndAuCodec::wxSndAuCodec(wxOutputStream& s, bool seekable)
  34   : wxSndFileCodec(s, seekable)
  35 {
  36 }
  37
  38 wxSndAuCodec::wxSndAuCodec(const wxString& fname)
  39   : wxSndFileCodec(fname)
  40 {
  41 }
  42
  43 wxSndAuCodec::~wxSndAuCodec()
  44 {
  45 }
  46
  47 wxUint32 wxSndAuCodec::PrepareToPlay()
  48 {
  49   wxString id;
  50   char temp_buf[5];
  51   int offset, srate, codec, ch_count;
  52   size_t len;
  53
  54   m_istream->SeekI(0);
  55
  56   m_istream->Read(temp_buf, 4);
  57   temp_buf[4] = 0;
  58
  59   id = temp_buf;
  60   if (id != ".snd") {
  61     m_mmerror = wxMMFILE_INVALID;
  62     return 0;
  63   }
  64
  65 #define READ_BE_32(i) \
  66 m_istream->Read(temp_buf, 4); \
  67 i = (unsigned long)temp_buf[0] << 24; \
  68 i |= (unsigned long)temp_buf[1] << 16; \
  69 i |= (unsigned long)temp_buf[2] << 8; \
  70 i |= (unsigned long)temp_buf[3];
  71
  72   READ_BE_32(offset);
  73   READ_BE_32(len);
  74   READ_BE_32(codec);
  75   READ_BE_32(srate);
  76   READ_BE_32(ch_count);
  77
  78   m_sndformat.SetSampleRate(srate);
  79   m_sndformat.SetChannels(ch_count);
  80   switch (codec) {
  81   case AU_ISDN_ULAW:
  82     ChangeCodec(WXSOUND_ULAW);
  83     break;
  84   case AU_PCM_8BITS:
  85     ChangeCodec(WXSOUND_PCM);
  86     m_sndformat.SetByteOrder(wxSND_SAMPLE_LE);
  87     m_sndformat.SetSign(wxSND_SAMPLE_SIGNED);
  88     break;
  89   case AU_PCM_16BITS:
  90     ChangeCodec(WXSOUND_PCM);
  91     m_sndformat.SetByteOrder(wxSND_SAMPLE_LE);
  92     m_sndformat.SetSign(wxSND_SAMPLE_SIGNED);
  93     break;
  94   case AU_ADPCM:
  95     ChangeCodec(WXSOUND_ADPCM);
  96     break;
  97   }
  98   return len;
  99 }
 100
 101 bool wxSndAuCodec::OnNeedData(char *buf, wxUint32 size)
 102 {
 103   return m_istream->Read(buf, size).LastError();
 104 }
 105
 106 bool wxSndAuCodec::OnWriteData(char *buf, wxUint32 size)
 107 {
 108   return m_ostream->Write(buf, size).LastError();
 109 }
 110
 111 bool wxSndAuCodec::PrepareToRecord(wxUint32 file_size)
 112 {
 113   return FALSE;
 114 }