MP3ADUdescriptor.hh

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FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
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// "liveMedia"
// Copyright (c) 1996-2024 Live Networks, Inc.  All rights reserved.
// Descriptor preceding frames of 'ADU' MP3 streams (for improved loss-tolerance)
// C++ header
 
#ifndef _MP3_ADU_DESCRIPTOR_HH
#define _MP3_ADU_DESCRIPTOR_HH
 
// A class for handling the descriptor that begins each ADU frame:
//   (Note: We don't yet implement fragmentation)
class ADUdescriptor {
public:
  // Operations for generating a new descriptor
  static unsigned computeSize(unsigned remainingFrameSize) {
    return remainingFrameSize >= 64 ? 2 : 1;
  }
  static unsigned generateDescriptor(unsigned char*& toPtr, unsigned remainingFrameSize);
   // returns descriptor size; increments "toPtr" afterwards
  static void generateTwoByteDescriptor(unsigned char*& toPtr, unsigned remainingFrameSize);
   // always generates a 2-byte descriptor, even if "remainingFrameSize" is
   // small enough for a 1-byte descriptor
 
  // Operations for reading a descriptor
  static unsigned getRemainingFrameSize(unsigned char*& fromPtr);
   // increments "fromPtr" afterwards
};
 
#endif