utils/wxMMedia2/lib/sndaiff.cpp

   1 // --------------------------------------------------------------------------
   2 // Name: sndaiff.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 "sndaiff.cpp"
  10 #endif
  11
  12 #include <wx/wxprec.h>
  13
  14 #include <wx/stream.h>
  15 #include <wx/datstrm.h>
  16 #include <wx/filefn.h>
  17 #include "sndbase.h"
  18 #include "sndcodec.h"
  19 #include "sndfile.h"
  20 #include "sndpcm.h"
  21 #include "sndaiff.h"
  22
  23 #define BUILD_SIGNATURE(a,b,c,d) (((wxUint32)a) | (((wxUint32)b) << 8) | (((wxUint32)c) << 16)  | (((wxUint32)d) << 24))
  24
  25 #define FORM_SIGNATURE BUILD_SIGNATURE('F','O','R','M')
  26 #define AIFF_SIGNATURE BUILD_SIGNATURE('A','I','F','F')
  27 #define AIFC_SIGNATURE BUILD_SIGNATURE('A','I','F','C')
  28 #define COMM_SIGNATURE BUILD_SIGNATURE('C','O','M','M')
  29 #define SSND_SIGNATURE BUILD_SIGNATURE('S','S','N','D')
  30
  31 wxSoundAiff::wxSoundAiff(wxInputStream& stream, wxSoundStream& io_sound)
  32   : wxSoundFileStream(stream, io_sound)
  33 {
  34 }
  35
  36 wxSoundAiff::wxSoundAiff(wxOutputStream& stream, wxSoundStream& io_sound)
  37   : wxSoundFileStream(stream, io_sound)
  38 {
  39 }
  40
  41 wxSoundAiff::~wxSoundAiff()
  42 {
  43 }
  44
  45 wxString wxSoundAiff::GetCodecName() const
  46 {
  47     return "wxSoundAiff codec";
  48 }
  49
  50 bool wxSoundAiff::CanRead()
  51 {
  52   wxUint32 signature1, signature2, len;
  53
  54   if (m_input->Read(&signature1, 4).LastRead() != 4)
  55     return FALSE;
  56
  57   if (wxUINT32_SWAP_ON_BE(signature1) != FORM_SIGNATURE) {
  58     m_input->Ungetch(&signature1, 4);
  59     return FALSE;
  60   }
  61
  62   m_input->Read(&len, 4);
  63   if (m_input->LastRead() != 4) {
  64     m_input->Ungetch(&len, m_input->LastRead());
  65     m_input->Ungetch(&signature1, 4);
  66     return FALSE;
  67   }
  68
  69   if (m_input->Read(&signature2, 4).LastRead() != 4) {
  70     m_input->Ungetch(&signature2, m_input->LastRead());
  71     m_input->Ungetch(&len, 4);
  72     m_input->Ungetch(&signature1, 4);
  73     return FALSE;
  74   }
  75
  76   m_input->Ungetch(&signature2, 4);
  77   m_input->Ungetch(&len, 4);
  78   m_input->Ungetch(&signature1, 4);
  79
  80   if (
  81          wxUINT32_SWAP_ON_BE(signature2) != AIFF_SIGNATURE &&
  82          wxUINT32_SWAP_ON_BE(signature2) != AIFC_SIGNATURE)
  83     return FALSE;
  84
  85   return TRUE;
  86 }
  87
  88 #define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
  89
  90 bool wxSoundAiff::PrepareToPlay()
  91 {
  92   wxDataInputStream data(*m_input);
  93   wxUint32 signature, len, ssnd;
  94   bool end_headers;
  95
  96   if (!m_input) {
  97     m_snderror = wxSOUND_INVSTRM;
  98     return FALSE;
  99   }
 100
 101   data.BigEndianOrdered(TRUE);
 102
 103   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
 104   FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != FORM_SIGNATURE, wxSOUND_INVSTRM);
 105      // "FORM"
 106
 107   len = data.Read32();
 108   FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
 109     // dummy len
 110
 111   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
 112   FAIL_WITH(
 113          wxUINT32_SWAP_ON_BE(signature) != AIFF_SIGNATURE &&
 114          wxUINT32_SWAP_ON_BE(signature) != AIFC_SIGNATURE, wxSOUND_INVSTRM);
 115      // "AIFF" / "AIFC"
 116
 117   end_headers = FALSE;
 118   while (!end_headers) {
 119     FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
 120
 121     len = data.Read32();
 122     FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
 123
 124     switch (wxUINT32_SWAP_ON_BE(signature)) {
 125     case COMM_SIGNATURE: { // "COMM"
 126       wxUint16 channels, bps;
 127       wxUint32 num_samples;
 128       double srate;
 129       wxSoundFormatPcm sndformat;
 130
 131       data >> channels >> num_samples >> bps >> srate;
 132
 133       sndformat.SetSampleRate((wxUint32) srate);
 134       sndformat.SetBPS(bps);
 135       sndformat.SetChannels(channels);
 136       sndformat.Signed(FALSE);
 137       sndformat.SetOrder(wxBIG_ENDIAN);
 138
 139       if (!SetSoundFormat(sndformat))
 140         return FALSE;
 141       m_input->SeekI(len-18, wxFromCurrent);
 142       break;
 143     }
 144     case SSND_SIGNATURE: {  // "SSND"
 145       data >> ssnd;
 146       // m_input->SeekI(4, wxFromCurrent);  // Pass an INT32
 147       // m_input->SeekI(len-4, wxFromCurrent); // Pass the rest
 148       m_input->SeekI(ssnd + 4, wxFromCurrent);
 149       FinishPreparation(len - 8);
 150       end_headers = TRUE;
 151       break;
 152     }
 153     default:
 154       m_input->SeekI(len, wxFromCurrent);
 155       break;
 156     }
 157   }
 158   return TRUE;
 159 }
 160
 161 bool wxSoundAiff::PrepareToRecord(unsigned long time)
 162 {
 163   // TODO
 164   return FALSE;
 165 }
 166
 167 bool wxSoundAiff::FinishRecording()
 168 {
 169   // TODO
 170   return FALSE;
 171 }
 172
 173 wxUint32 wxSoundAiff::GetData(void *buffer, wxUint32 len)
 174 {
 175   return m_input->Read(buffer, len).LastRead();
 176 }
 177
 178 wxUint32 wxSoundAiff::PutData(const void *buffer, wxUint32 len)
 179 {
 180   return m_output->Write(buffer, len).LastWrite();
 181 }