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