Package org.mp4parser.boxes.iso14496.part12

Class CompositionTimeToSample

  • All Implemented Interfaces:
    Box, FullBox, ParsableBox
    public class CompositionTimeToSample
extends AbstractFullBox

    4cc = ""ctts""

     aligned(8) class CompositionOffsetBox extends FullBox(‘ctts’, version = 0, 0) {
  unsigned int(32) entry_count;
  int i;
  if (version==0) {
   for (i=0; i < entry_count; i++) {
    unsigned int(32) sample_count;
    unsigned int(32) sample_offset;
   }
  }
  else if (version == 1) {
   for (i=0; i < entry_count; i++) {
    unsigned int(32) sample_count;
    signed int(32) sample_offset;
   }
  }
 }

    This box provides the offset between decoding time and composition time. In version 0 of this box the decoding time must be less than the composition time, and the offsets are expressed as unsigned numbers such that

    CT(n) = DT(n) + CTTS(n) where CTTS(n) is the (uncompressed) table entry for sample n.

    In version 1 of this box, the composition timeline and the decoding timeline are still derived from each other, but the offsets are signed. It is recommended that for the computed composition timestamps, there is exactly one with the value 0 (zero).

    • Constructor Detail

      • CompositionTimeToSample

        public CompositionTimeToSample()

    • Method Detail

      • blowupCompositionTimes

        public static int[] blowupCompositionTimes​(List<CompositionTimeToSample.Entry> entries)
        Decompresses the list of entries and returns the list of composition times.
        Parameters:
        entries - composition time to sample entries in compressed form
        Returns:
        decoding time per sample

      • _parseDetails

        public void _parseDetails​(ByteBuffer content)
        Description copied from class: AbstractBox
        Parse the box's fields and child boxes if any.
        Specified by:
        _parseDetails in class AbstractBox
        Parameters:
        content - the box's raw content beginning after the 4-cc field.

      • getContent

        protected void getContent​(ByteBuffer byteBuffer)
        Description copied from class: AbstractBox
        Write the box's content into the given ByteBuffer. This must include flags and version in case of a full box. byteBuffer has been initialized with getSize() bytes.
        Specified by:
        getContent in class AbstractBox
        Parameters:
        byteBuffer - the sink for the box's content