com.coremedia.iso.boxes
Class CompositionTimeToSample

java.lang.Object
  com.googlecode.mp4parser.AbstractBox
      com.googlecode.mp4parser.AbstractFullBox
          com.coremedia.iso.boxes.CompositionTimeToSample

All Implemented Interfaces:

Box, FullBox

public class CompositionTimeToSample
extends AbstractFullBox

 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).

Nested Class Summary

static class

CompositionTimeToSample.Entry

Field Summary

static String

TYPE

Fields inherited from class com.googlecode.mp4parser.AbstractBox

type

Constructor Summary

CompositionTimeToSample()

Method Summary

void	_parseDetails(ByteBuffer content) Parse the box's fields and child boxes if any.
static int[]	blowupCompositionTimes(List<CompositionTimeToSample.Entry> entries) Decompresses the list of entries and returns the list of composition times.
protected void	getContent(ByteBuffer byteBuffer) Write the box's content into the given ByteBuffer.
protected long	getContentSize() Get the box's content size without its header.
List<CompositionTimeToSample.Entry>	getEntries()
void	setEntries(List<CompositionTimeToSample.Entry> entries)

Methods inherited from class com.googlecode.mp4parser.AbstractFullBox

getFlags, getVersion, parseVersionAndFlags, setFlags, setVersion, writeVersionAndFlags

Methods inherited from class com.googlecode.mp4parser.AbstractBox

getBox, getIsoFile, getParent, getSize, getType, getUserType, isParsed, parse, setDeadBytes, setParent

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface com.coremedia.iso.boxes.Box

getBox, getParent, getSize, getType, parse, setParent

Field Detail

TYPE

public static final String TYPE

See Also:

Constant Field Values

Constructor Detail

CompositionTimeToSample

public CompositionTimeToSample()

Method Detail

getContentSize

protected long getContentSize()

Description copied from class: AbstractBox

Get the box's content size without its header. This must be the exact number of bytes that getContent(ByteBuffer) writes.

Specified by:

getContentSize in class AbstractBox

Returns:

Gets the box's content size in bytes

See Also:

AbstractBox.getContent(java.nio.ByteBuffer)

getEntries

public List<CompositionTimeToSample.Entry> getEntries()

setEntries

public void setEntries(List<CompositionTimeToSample.Entry> entries)

_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

blowupCompositionTimes

public static int[] blowupCompositionTimes(List<CompositionTimeToSample.Entry> entries)

Decompresses the list of entries and returns the list of composition times.

Returns:

decoding time per sample