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/defs.h>
  13 #include <wx/stream.h>
  14 #include <wx/datstrm.h>
  15 #include <wx/filefn.h>
  16 #include "sndbase.h"
  17 #include "sndcodec.h"
  18 #include "sndfile.h"
  19 #include "sndpcm.h"
  20 #include "sndaiff.h"
  21
  22 #define BUILD_SIGNATURE(a,b,c,d) (((wxUint32)a) | (((wxUint32)b) << 8) | (((wxUint32)c) << 16)  | (((wxUint32)d) << 24))
  23
  24 #define FORM_SIGNATURE BUILD_SIGNATURE('F','O','R','M')
  25 #define AIFF_SIGNATURE BUILD_SIGNATURE('A','I','F','F')
  26 #define AIFC_SIGNATURE BUILD_SIGNATURE('A','I','F','C')
  27 #define COMM_SIGNATURE BUILD_SIGNATURE('C','O','M','M')
  28 #define SSND_SIGNATURE BUILD_SIGNATURE('S','S','N','D')
  29
  30 wxSoundAiff::wxSoundAiff(wxInputStream& stream, wxSoundStream& io_sound)
  31   : wxSoundFileStream(stream, io_sound)
  32 {
  33 }
  34
  35 wxSoundAiff::wxSoundAiff(wxOutputStream& stream, wxSoundStream& io_sound)
  36   : wxSoundFileStream(stream, io_sound)
  37 {
  38 }
  39
  40 wxSoundAiff::~wxSoundAiff()
  41 {
  42 }
  43
  44 #define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
  45
  46 bool wxSoundAiff::PrepareToPlay()
  47 {
  48   wxDataInputStream data(*m_input);
  49   wxUint32 signature, len, ssnd;
  50   bool end_headers;
  51
  52   if (!m_input) {
  53     m_snderror = wxSOUND_INVSTRM;
  54     return FALSE;
  55   }
  56
  57   data.BigEndianOrdered(TRUE);
  58
  59   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
  60   FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != FORM_SIGNATURE, wxSOUND_INVSTRM);
  61      // "FORM"
  62
  63   len = data.Read32();
  64   FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
  65     // dummy len
  66
  67   FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
  68   FAIL_WITH(
  69          wxUINT32_SWAP_ON_BE(signature) != AIFF_SIGNATURE &&
  70          wxUINT32_SWAP_ON_BE(signature) != AIFC_SIGNATURE, wxSOUND_INVSTRM);
  71      // "AIFF" / "AIFC"
  72
  73   end_headers = FALSE;
  74   while (!end_headers) {
  75     FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
  76
  77     len = data.Read32();
  78     FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
  79
  80     switch (wxUINT32_SWAP_ON_BE(signature)) {
  81     case COMM_SIGNATURE: { // "COMM"
  82       wxUint16 channels, bps;
  83       wxUint32 num_samples;
  84       double srate;
  85       wxSoundFormatPcm sndformat;
  86
  87       data >> channels >> num_samples >> bps >> srate;
  88
  89       sndformat.SetSampleRate((wxUint32) srate);
  90       sndformat.SetBPS(bps);
  91       sndformat.SetChannels(channels);
  92       sndformat.Signed(TRUE);
  93       sndformat.SetOrder(wxBIG_ENDIAN);
  94
  95       if (!SetSoundFormat(sndformat))
  96         return FALSE;
  97       m_input->SeekI(len-18, wxFromCurrent);
  98       break;
  99     }
 100     case SSND_SIGNATURE: {  // "SSND"
 101       data >> ssnd;
 102       // m_input->SeekI(4, wxFromCurrent);  // Pass an INT32
 103       // m_input->SeekI(len-4, wxFromCurrent); // Pass the rest
 104       m_input->SeekI(ssnd + 4, wxFromCurrent);
 105       end_headers = TRUE;
 106       break;
 107     }
 108     default:
 109       m_input->SeekI(len, wxFromCurrent);
 110       break;
 111     }
 112   }
 113   return TRUE;
 114 }
 115
 116 bool wxSoundAiff::PrepareToRecord(unsigned long time)
 117 {
 118   return FALSE;
 119 }
 120
 121 bool wxSoundAiff::FinishRecording()
 122 {
 123   return FALSE;
 124 }
 125
 126 size_t wxSoundAiff::GetData(void *buffer, size_t len)
 127 {
 128   return m_input->Read(buffer, len).LastRead();
 129 }
 130
 131 size_t wxSoundAiff::PutData(const void *buffer, size_t len)
 132 {
 133   return m_output->Write(buffer, len).LastWrite();
 134 }