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 bool wxSoundAiff::CanRead()
  46 {
  47   wxUint32 signature1, signature2, len;
  48
  49   if (m_input->Read(&signature1, 4).LastRead() != 4)
  50     return FALSE;
  51
  52   if (wxUINT32_SWAP_ON_BE(signature1) != FORM_SIGNATURE) {
  53     m_input->Ungetch(&signature1, 4);
  54     return FALSE;
  55   }
  56
  57   m_input->Read(&len, 4);
  58   if (m_input->LastRead() != 4) {
  59     m_input->Ungetch(&len, m_input->LastRead());
  60     m_input->Ungetch(&signature1, 4);
  61     return FALSE;
  62   }
  63
  64   if (m_input->Read(&signature2, 4).LastRead() != 4) {
  65     m_input->Ungetch(&signature2, m_input->LastRead());
  66     m_input->Ungetch(&len, 4);
  67     m_input->Ungetch(&signature1, 4);
  68     return FALSE;
  69   }
  70
  71   m_input->Ungetch(&signature2, 4);
  72   m_input->Ungetch(&len, 4);
  73   m_input->Ungetch(&signature1, 4);
  74
  75   if (
  76          wxUINT32_SWAP_ON_BE(signature2) != AIFF_SIGNATURE &&
  77          wxUINT32_SWAP_ON_BE(signature2) != AIFC_SIGNATURE)
  78     return FALSE;
  79
  80   return TRUE;
  81 }
  82
  83 #define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
  84
  85 bool wxSoundAiff::PrepareToPlay()
  86 {
  87   wxDataInputStream data(*m_input);
  88   wxUint32 signature, len, ssnd;
  89   bool end_headers;
  90
  91   if (!m_input) {
  92     m_snderror = wxSOUND_INVSTRM;
  93     return FALSE;
  94   }
  95
  96   data.BigEndianOrdered(TRUE);
  97
  98   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
  99   FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != FORM_SIGNATURE, wxSOUND_INVSTRM);
 100      // "FORM"
 101
 102   len = data.Read32();
 103   FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
 104     // dummy len
 105
 106   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
 107   FAIL_WITH(
 108          wxUINT32_SWAP_ON_BE(signature) != AIFF_SIGNATURE &&
 109          wxUINT32_SWAP_ON_BE(signature) != AIFC_SIGNATURE, wxSOUND_INVSTRM);
 110      // "AIFF" / "AIFC"
 111
 112   end_headers = FALSE;
 113   while (!end_headers) {
 114     FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
 115
 116     len = data.Read32();
 117     FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
 118
 119     switch (wxUINT32_SWAP_ON_BE(signature)) {
 120     case COMM_SIGNATURE: { // "COMM"
 121       wxUint16 channels, bps;
 122       wxUint32 num_samples;
 123       double srate;
 124       wxSoundFormatPcm sndformat;
 125
 126       data >> channels >> num_samples >> bps >> srate;
 127
 128       sndformat.SetSampleRate((wxUint32) srate);
 129       sndformat.SetBPS(bps);
 130       sndformat.SetChannels(channels);
 131       sndformat.Signed(FALSE);
 132       sndformat.SetOrder(wxBIG_ENDIAN);
 133
 134       if (!SetSoundFormat(sndformat))
 135         return FALSE;
 136       m_input->SeekI(len-18, wxFromCurrent);
 137       break;
 138     }
 139     case SSND_SIGNATURE: {  // "SSND"
 140       data >> ssnd;
 141       // m_input->SeekI(4, wxFromCurrent);  // Pass an INT32
 142       // m_input->SeekI(len-4, wxFromCurrent); // Pass the rest
 143       m_input->SeekI(ssnd + 4, wxFromCurrent);
 144       end_headers = TRUE;
 145       break;
 146     }
 147     default:
 148       m_input->SeekI(len, wxFromCurrent);
 149       break;
 150     }
 151   }
 152   return TRUE;
 153 }
 154
 155 bool wxSoundAiff::PrepareToRecord(unsigned long time)
 156 {
 157   // TODO
 158   return FALSE;
 159 }
 160
 161 bool wxSoundAiff::FinishRecording()
 162 {
 163   // TODO
 164   return FALSE;
 165 }
 166
 167 wxUint32 wxSoundAiff::GetData(void *buffer, wxUint32 len)
 168 {
 169   return m_input->Read(buffer, len).LastRead();
 170 }
 171
 172 wxUint32 wxSoundAiff::PutData(const void *buffer, wxUint32 len)
 173 {
 174   return m_output->Write(buffer, len).LastWrite();
 175 }