/// <summary>
/// Loads AudioSampleEntry atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_audio_sample_entry_atom(Mp4DataStream bitstream)
{
//qtff page 117
#if !SILVERLIGHT
log.Debug("Audio sample entry");
#endif
bitstream.SkipBytes(6);
int dataReferenceIndex = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(8);
channelCount = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Channels: {0}", channelCount));
#endif
sampleSize = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Sample size (bits): {0}", sampleSize));
#endif
bitstream.SkipBytes(4);
timeScale = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Time scale: {0}", timeScale));
#endif
bitstream.SkipBytes(2);
_bytesRead += 28;
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
return(_bytesRead);
}
/// <summary>
/// Loads the composite atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_composite_atom(Mp4DataStream bitstream)
{
while (_bytesRead < _size)
{
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
}
return(_bytesRead);
}
/// <summary>
/// Loads MP4VideoSampleEntryAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_video_sample_entry_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Video entry atom contains wxh");
#endif
bitstream.SkipBytes(6);
int dataReferenceIndex = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(2);
bitstream.SkipBytes(2);
bitstream.SkipBytes(12);
width = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Width: {0}", width));
#endif
height = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Height: {0}", height));
#endif
int horizontalRez = (int)bitstream.ReadBytes(4) >> 16;
#if !SILVERLIGHT
log.Debug(string.Format("H Resolution: {0}", horizontalRez));
#endif
int verticalRez = (int)bitstream.ReadBytes(4) >> 16;
#if !SILVERLIGHT
log.Debug(string.Format("V Resolution: {0}", verticalRez));
#endif
bitstream.SkipBytes(4);
int frameCount = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Frame to sample count: {0}", frameCount));
#endif
int stringLen = (int)bitstream.ReadBytes(1);
#if !SILVERLIGHT
log.Debug(string.Format("String length (cpname): {0}", stringLen));
#endif
String compressorName = bitstream.ReadString(31);
#if !SILVERLIGHT
log.Debug(string.Format("Compressor name: {0}", compressorName.Trim()));
#endif
int depth = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Depth: {0}", depth));
#endif
bitstream.SkipBytes(2);
_bytesRead += 78;
#if !SILVERLIGHT
log.Debug(string.Format("Bytes read: {0}", _bytesRead));
#endif
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
return(_bytesRead);
}
/// <summary>
/// Loads SampleDescription atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sample_description_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("stsd entry count: {0}", entryCount));
#endif
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
}
return(_bytesRead);
}
/// <summary>
/// Creates the PASP atom or Pixel Aspect Ratio. It is created by Quicktime
/// when exporting an MP4 file. The atom is required for ipod's and acts as
/// a container for the avcC atom in these cases.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_pasp_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Pixel aspect ratio");
#endif
int hSpacing = (int)bitstream.ReadBytes(4);
int vSpacing = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("hSpacing: {0} vSpacing: {1}", hSpacing, vSpacing));
#endif
_bytesRead += 8;
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
return(_bytesRead);
}
/// <summary>
/// Loads MP4VisualSampleEntryAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_visual_sample_entry_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Visual entry atom contains wxh");
#endif
bitstream.SkipBytes(24);
width = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Width: {0}", width));
#endif
height = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Height: {0}", height));
#endif
bitstream.SkipBytes(50);
_bytesRead += 78;
Mp4Atom child = Mp4Atom.CreateAtom(bitstream);
_children.Add(child);
_bytesRead += child.Size;
return(_bytesRead);
}
