/// <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>
/// Looks up a child atom with the specified type, skips the <code>number</code> children with the same type before finding a result.
/// </summary>
/// <param name="type">The type of the atom.</param>
/// <param name="number">The number of atoms to skip.</param>
/// <returns>The atom if found othwerwise null.</returns>
public Mp4Atom Lookup(long type, int number)
{
int position = 0;
for (int i = 0; i < _children.Count; i++)
{
Mp4Atom atom = _children[i];
if (atom.Type == type)
{
if (position >= number)
{
return(atom);
}
position++;
}
}
return(null);
}
/// <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);
}
/// <summary>
/// Constructs an Atom object from the data in the bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The constructed atom.</returns>
public static Mp4Atom CreateAtom(Mp4DataStream bitstream)
{
String uuid = null;
long size = bitstream.ReadBytes(4);
if (size == 0)
{
throw new IOException("Invalid size");
}
int type = (int)bitstream.ReadBytes(4);
long bytesRead = 8;
if (type == MP4ExtendedAtomType)
{
uuid = bitstream.ReadString(16);
bytesRead += 16;
}
// large size
if (size == 1)
{
size = bitstream.ReadBytes(8);
bytesRead += 8;
}
Mp4Atom atom = new Mp4Atom(size, type, uuid, bytesRead);
if ((type == MP4MediaAtomType) || (type == MP4DataInformationAtomType) || (type == MP4MovieAtomType)
|| (type == MP4MediaInformationAtomType) || (type == MP4SampleTableAtomType) || (type == MP4TrackAtomType))
{
bytesRead = atom.create_composite_atom(bitstream);
}
else if (type == MP4AudioSampleEntryAtomType)
{
bytesRead = atom.create_audio_sample_entry_atom(bitstream);
}
else if (type == MP4ChunkLargeOffsetAtomType)
{
bytesRead = atom.create_chunk_large_offset_atom(bitstream);
}
else if (type == MP4ChunkOffsetAtomType)
{
bytesRead = atom.create_chunk_offset_atom(bitstream);
}
else if (type == MP4HandlerAtomType)
{
bytesRead = atom.create_handler_atom(bitstream);
}
else if (type == MP4MediaHeaderAtomType)
{
bytesRead = atom.create_media_header_atom(bitstream);
}
else if (type == MP4MovieHeaderAtomType)
{
bytesRead = atom.create_movie_header_atom(bitstream);
}
else if (type == MP4SampleDescriptionAtomType)
{
bytesRead = atom.create_sample_description_atom(bitstream);
}
else if (type == MP4SampleSizeAtomType)
{
bytesRead = atom.create_sample_size_atom(bitstream);
}
else if (type == MP4CompactSampleSizeAtomType)
{
bytesRead = atom.create_compact_sample_size_atom(bitstream);
}
else if (type == MP4SampleToChunkAtomType)
{
bytesRead = atom.create_sample_to_chunk_atom(bitstream);
}
else if (type == MP4SyncSampleAtomType)
{
bytesRead = atom.create_sync_sample_atom(bitstream);
}
else if (type == MP4TimeToSampleAtomType)
{
bytesRead = atom.create_time_to_sample_atom(bitstream);
}
else if (type == MP4SoundMediaHeaderAtomType)
{
bytesRead = atom.create_sound_media_header_atom(bitstream);
}
else if (type == MP4TrackHeaderAtomType)
{
bytesRead = atom.create_track_header_atom(bitstream);
}
else if (type == MP4VideoMediaHeaderAtomType)
{
bytesRead = atom.create_video_media_header_atom(bitstream);
}
else if (type == MP4VisualSampleEntryAtomType)
{
bytesRead = atom.create_visual_sample_entry_atom(bitstream);
}
else if (type == MP4VideoSampleEntryAtomType)
{
bytesRead = atom.create_video_sample_entry_atom(bitstream);
}
else if (type == MP4ESDAtomType)
{
bytesRead = atom.create_esd_atom(bitstream);
}
else if (type == MP4AVCAtomType)
{
bytesRead = atom.create_avc_config_atom(bitstream);
}
else if (type == MP4PixelAspectAtomType)
{
bytesRead = atom.create_pasp_atom(bitstream);
}
#if !SILVERLIGHT
log.Debug(string.Format("Atom: type = {0} size = {1}", IntToType(type), size));
#endif
bitstream.SkipBytes(size - bytesRead);
return atom;
}
/// <summary>
/// Constructs an Atom object from the data in the bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The constructed atom.</returns>
public static Mp4Atom CreateAtom(Mp4DataStream bitstream)
{
String uuid = null;
long size = bitstream.ReadBytes(4);
if (size == 0)
{
throw new IOException("Invalid size");
}
int type = (int)bitstream.ReadBytes(4);
long bytesRead = 8;
if (type == MP4ExtendedAtomType)
{
uuid = bitstream.ReadString(16);
bytesRead += 16;
}
// large size
if (size == 1)
{
size = bitstream.ReadBytes(8);
bytesRead += 8;
}
Mp4Atom atom = new Mp4Atom(size, type, uuid, bytesRead);
if ((type == MP4MediaAtomType) || (type == MP4DataInformationAtomType) || (type == MP4MovieAtomType) ||
(type == MP4MediaInformationAtomType) || (type == MP4SampleTableAtomType) || (type == MP4TrackAtomType))
{
bytesRead = atom.create_composite_atom(bitstream);
}
else if (type == MP4AudioSampleEntryAtomType)
{
bytesRead = atom.create_audio_sample_entry_atom(bitstream);
}
else if (type == MP4ChunkLargeOffsetAtomType)
{
bytesRead = atom.create_chunk_large_offset_atom(bitstream);
}
else if (type == MP4ChunkOffsetAtomType)
{
bytesRead = atom.create_chunk_offset_atom(bitstream);
}
else if (type == MP4HandlerAtomType)
{
bytesRead = atom.create_handler_atom(bitstream);
}
else if (type == MP4MediaHeaderAtomType)
{
bytesRead = atom.create_media_header_atom(bitstream);
}
else if (type == MP4MovieHeaderAtomType)
{
bytesRead = atom.create_movie_header_atom(bitstream);
}
else if (type == MP4SampleDescriptionAtomType)
{
bytesRead = atom.create_sample_description_atom(bitstream);
}
else if (type == MP4SampleSizeAtomType)
{
bytesRead = atom.create_sample_size_atom(bitstream);
}
else if (type == MP4CompactSampleSizeAtomType)
{
bytesRead = atom.create_compact_sample_size_atom(bitstream);
}
else if (type == MP4SampleToChunkAtomType)
{
bytesRead = atom.create_sample_to_chunk_atom(bitstream);
}
else if (type == MP4SyncSampleAtomType)
{
bytesRead = atom.create_sync_sample_atom(bitstream);
}
else if (type == MP4TimeToSampleAtomType)
{
bytesRead = atom.create_time_to_sample_atom(bitstream);
}
else if (type == MP4SoundMediaHeaderAtomType)
{
bytesRead = atom.create_sound_media_header_atom(bitstream);
}
else if (type == MP4TrackHeaderAtomType)
{
bytesRead = atom.create_track_header_atom(bitstream);
}
else if (type == MP4VideoMediaHeaderAtomType)
{
bytesRead = atom.create_video_media_header_atom(bitstream);
}
else if (type == MP4VisualSampleEntryAtomType)
{
bytesRead = atom.create_visual_sample_entry_atom(bitstream);
}
else if (type == MP4VideoSampleEntryAtomType)
{
bytesRead = atom.create_video_sample_entry_atom(bitstream);
}
else if (type == MP4ESDAtomType)
{
bytesRead = atom.create_esd_atom(bitstream);
}
else if (type == MP4AVCAtomType)
{
bytesRead = atom.create_avc_config_atom(bitstream);
}
else if (type == MP4PixelAspectAtomType)
{
bytesRead = atom.create_pasp_atom(bitstream);
}
#if !SILVERLIGHT
log.Debug(string.Format("Atom: type = {0} size = {1}", IntToType(type), size));
#endif
bitstream.SkipBytes(size - bytesRead);
return(atom);
}