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[wxWidgets.git] / utils / wxMMedia2 / lib / sndaiff.cpp

diff --git a/utils/wxMMedia2/lib/sndaiff.cpp b/utils/wxMMedia2/lib/sndaiff.cpp
index 70a6a6a21c11f23fc220809d7f541fd71bae22b2..7c6bfb4018269e1eff4a0d138bd710c5201fcbc4 100644 (file)
--- a/utils/wxMMedia2/lib/sndaiff.cpp
+++ b/utils/wxMMedia2/lib/sndaiff.cpp
@@ -31,107 +31,162 @@
 wxSoundAiff::wxSoundAiff(wxInputStream& stream, wxSoundStream& io_sound)
   : wxSoundFileStream(stream, io_sound)
 {
+    m_base_offset = wxInvalidOffset;
 }
 
 wxSoundAiff::wxSoundAiff(wxOutputStream& stream, wxSoundStream& io_sound)
   : wxSoundFileStream(stream, io_sound)
 {
+    m_base_offset = wxInvalidOffset;
 }
 
 wxSoundAiff::~wxSoundAiff()
 {
 }
 
-#define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
-
-bool wxSoundAiff::PrepareToPlay()
+wxString wxSoundAiff::GetCodecName() const
 {
-  wxDataInputStream data(*m_input);
-  wxUint32 signature, len, ssnd;
-  bool end_headers;
-
-  if (!m_input) {
-    m_snderror = wxSOUND_INVSTRM;
-    return FALSE;
-  }
-
-  data.BigEndianOrdered(TRUE);
-
-  FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
-  FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != FORM_SIGNATURE, wxSOUND_INVSTRM);
-     // "FORM"
+    return "wxSoundAiff codec";
+}
 
-  len = data.Read32(); 
-  FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
-    // dummy len
- 
-  FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
-  FAIL_WITH(
-         wxUINT32_SWAP_ON_BE(signature) != AIFF_SIGNATURE &&
-         wxUINT32_SWAP_ON_BE(signature) != AIFC_SIGNATURE, wxSOUND_INVSTRM);
-     // "AIFF" / "AIFC"
- 
-  end_headers = FALSE;
-  while (!end_headers) {
-    FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
+bool wxSoundAiff::CanRead()
+{
+    wxUint32 signature1, signature2, len;
+    
+    if (m_input->Read(&signature1, 4).LastRead() != 4)
+        return FALSE;
+    
+    if (wxUINT32_SWAP_ON_BE(signature1) != FORM_SIGNATURE) {
+        m_input->Ungetch(&signature1, 4);
+        return FALSE;
+    }
+    
+    m_input->Read(&len, 4);
+    if (m_input->LastRead() != 4) {
+        m_input->Ungetch(&len, m_input->LastRead());
+        m_input->Ungetch(&signature1, 4);
+        return FALSE;
+    }
+    
+    if (m_input->Read(&signature2, 4).LastRead() != 4) {
+        m_input->Ungetch(&signature2, m_input->LastRead());
+        m_input->Ungetch(&len, 4);
+        m_input->Ungetch(&signature1, 4);
+        return FALSE;
+    }
+    
+    m_input->Ungetch(&signature2, 4);
+    m_input->Ungetch(&len, 4);
+    m_input->Ungetch(&signature1, 4);
+    
+    if (
+        wxUINT32_SWAP_ON_BE(signature2) != AIFF_SIGNATURE &&
+        wxUINT32_SWAP_ON_BE(signature2) != AIFC_SIGNATURE)
+        return FALSE;
+    
+    return TRUE;
+}
 
-    len = data.Read32();
-    FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
+#define FAIL_WITH(condition, err) if (condition) { m_snderror = err; return FALSE; }
 
-    switch (wxUINT32_SWAP_ON_BE(signature)) {
-    case COMM_SIGNATURE: { // "COMM"
-      wxUint16 channels, bps;
-      wxUint32 num_samples;
-      double srate;
-      wxSoundFormatPcm sndformat;
-
-      data >> channels >> num_samples >> bps >> srate; 
-      
-      sndformat.SetSampleRate((wxUint32) srate);
-      sndformat.SetBPS(bps);
-      sndformat.SetChannels(channels);
-      sndformat.Signed(TRUE);
-      sndformat.SetOrder(wxBIG_ENDIAN);
-
-      if (!SetSoundFormat(sndformat))
+bool wxSoundAiff::PrepareToPlay()
+{
+    wxDataInputStream data(*m_input);
+    wxUint32 signature, len, ssnd;
+    bool end_headers;
+    
+    if (!m_input) {
+        m_snderror = wxSOUND_INVSTRM;
         return FALSE;
-      m_input->SeekI(len-18, wxFromCurrent);
-      break;
-    }
-    case SSND_SIGNATURE: {  // "SSND"
-      data >> ssnd;
-      // m_input->SeekI(4, wxFromCurrent);  // Pass an INT32
-      // m_input->SeekI(len-4, wxFromCurrent); // Pass the rest
-      m_input->SeekI(ssnd + 4, wxFromCurrent);
-      end_headers = TRUE;
-      break;
     }
-    default:
-      m_input->SeekI(len, wxFromCurrent);
-      break;
+    
+    data.BigEndianOrdered(TRUE);
+    
+    FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
+    FAIL_WITH(wxUINT32_SWAP_ON_BE(signature) != FORM_SIGNATURE, wxSOUND_INVSTRM);
+    // "FORM"
+    
+    len = data.Read32(); 
+    FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
+    // dummy len
+    
+    FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
+    FAIL_WITH(
+        wxUINT32_SWAP_ON_BE(signature) != AIFF_SIGNATURE &&
+        wxUINT32_SWAP_ON_BE(signature) != AIFC_SIGNATURE, wxSOUND_INVSTRM);
+    // "AIFF" / "AIFC"
+    
+    end_headers = FALSE;
+    while (!end_headers) {
+        FAIL_WITH(m_input->Read(&signature, 4).LastRead() != 4, wxSOUND_INVSTRM);
+        
+        len = data.Read32();
+        FAIL_WITH(m_input->LastRead() != 4, wxSOUND_INVSTRM);
+        
+        switch (wxUINT32_SWAP_ON_BE(signature)) {
+            case COMM_SIGNATURE: { // "COMM"
+                wxUint16 channels, bps;
+                wxUint32 num_samples;
+                double srate;
+                wxSoundFormatPcm sndformat;
+                
+                data >> channels >> num_samples >> bps >> srate; 
+                
+                sndformat.SetSampleRate((wxUint32) srate);
+                sndformat.SetBPS(bps);
+                sndformat.SetChannels(channels);
+                sndformat.Signed(FALSE);
+                sndformat.SetOrder(wxBIG_ENDIAN);
+                
+                if (!SetSoundFormat(sndformat))
+                    return FALSE;
+                m_input->SeekI(len-18, wxFromCurrent);
+                break;
+            }
+            case SSND_SIGNATURE: {  // "SSND"
+                data >> ssnd;
+                // m_input->SeekI(4, wxFromCurrent);  // Pass an INT32
+                // m_input->SeekI(len-4, wxFromCurrent); // Pass the rest
+                m_input->SeekI(ssnd + 4, wxFromCurrent);
+                m_base_offset = m_input->TellI();
+                FinishPreparation(len - 8);
+                end_headers = TRUE;
+                break;
+            }
+            default:
+                m_input->SeekI(len, wxFromCurrent);
+                break;
+        }
     }
-  }
-  return TRUE;
+    return TRUE;
 }
 
-bool wxSoundAiff::PrepareToRecord(unsigned long time)
+bool wxSoundAiff::PrepareToRecord(wxUint32 time)
 {
-  // TODO
-  return FALSE;
+    // TODO
+    return FALSE;
 }
 
 bool wxSoundAiff::FinishRecording()
 {
-  // TODO
-  return FALSE;
+    // TODO
+    return FALSE;
+}
+
+bool wxSoundAiff::RepositionStream(wxUint32 position)
+{
+    if (m_base_offset == wxInvalidOffset)
+        return FALSE;
+    m_input->SeekI(m_base_offset, wxFromStart);
+    return TRUE;
 }
 
 wxUint32 wxSoundAiff::GetData(void *buffer, wxUint32 len)
 {
-  return m_input->Read(buffer, len).LastRead();
+    return m_input->Read(buffer, len).LastRead();
 }
 
 wxUint32 wxSoundAiff::PutData(const void *buffer, wxUint32 len)
 {
-  return m_output->Write(buffer, len).LastWrite();
+    return m_output->Write(buffer, len).LastWrite();
 }