/// <summary>
/// Loads MediaHeader atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 28;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 16;
}
int packedLanguage = (int)bitstream.ReadBytes(2);
int qt_quality = (int)bitstream.ReadBytes(2);
_bytesRead += 4;
return(_bytesRead);
}
/// <summary>
/// Loads M4ESDAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_esd_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
esd_descriptor = Mp4Descriptor.CreateDescriptor(bitstream);
_bytesRead += esd_descriptor.BytesRead;
return(_bytesRead);
}
/// <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);
}
public static Mp4Descriptor CreateDescriptor(Mp4DataStream bitstream)
{
int tag = (int)bitstream.ReadBytes(1);
int bytesRead = 1;
int size = 0;
int b = 0;
do
{
b = (int)bitstream.ReadBytes(1);
size <<= 7;
size |= b & 0x7f;
bytesRead++;
} while ((b & 0x80) == 0x80);
Mp4Descriptor descriptor = new Mp4Descriptor(tag, size);
switch (tag)
{
case MP4ES_DescriptorTag:
descriptor.CreateESDescriptor(bitstream);
break;
case MP4DecoderConfigDescriptorTag:
descriptor.CreateDecoderConfigDescriptor(bitstream);
break;
case MP4DecSpecificInfoDescriptorTag:
descriptor.CreateDecSpecificInfoDescriptor(bitstream);
break;
default:
break;
}
bitstream.SkipBytes(descriptor._size - descriptor._bytesRead);
descriptor._bytesRead = bytesRead + descriptor._size;
return descriptor;
}
/// <summary>
/// Loads the MP4ES_Descriptor from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
public void CreateESDescriptor(Mp4DataStream bitstream)
{
int ES_ID = (int)bitstream.ReadBytes(2);
int flags = (int)bitstream.ReadBytes(1);
bool streamDependenceFlag = (flags & (1 << 7)) != 0;
bool urlFlag = (flags & (1 << 6)) != 0;
bool ocrFlag = (flags & (1 << 5)) != 0;
_bytesRead += 3;
if (streamDependenceFlag)
{
bitstream.SkipBytes(2);
_bytesRead += 2;
}
if (urlFlag)
{
int str_size = (int)bitstream.ReadBytes(1);
bitstream.ReadString(str_size);
_bytesRead += str_size + 1;
}
if (ocrFlag)
{
bitstream.SkipBytes(2);
_bytesRead += 2;
}
while (_bytesRead < _size)
{
Mp4Descriptor descriptor = CreateDescriptor(bitstream);
_children.Add(descriptor);
_bytesRead += descriptor.BytesRead;
}
}
/// <summary>
/// Loads MP4SoundMediaHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sound_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
balance = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(2);
_bytesRead += 4;
return(_bytesRead);
}
/// <summary>
/// Loads the version of the full atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_full_atom(Mp4DataStream bitstream)
{
long value = bitstream.ReadBytes(4);
version = (int)value >> 24;
flags = (int)value & 0xffffff;
_bytesRead += 4;
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);
}
public void CreateDecSpecificInfoDescriptor(Mp4DataStream bitstream)
{
decSpecificDataOffset = bitstream.Offset;
dsid = new byte[_size];
for (int b = 0; b < _size; b++)
{
dsid[b] = (byte)bitstream.ReadBytes(1);
_bytesRead++;
}
decSpecificDataSize = _size - _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 AVCC atom from the input bitstream.
/// <para>
/// 8+ bytes ISO/IEC 14496-10 or 3GPP AVC decode config box
/// = long unsigned offset + long ASCII text string 'avcC'
/// -> 1 byte version = 8-bit hex version (current = 1)
/// -> 1 byte H.264 profile = 8-bit unsigned stream profile
/// -> 1 byte H.264 compatible profiles = 8-bit hex flags
/// -> 1 byte H.264 level = 8-bit unsigned stream level
/// -> 1 1/2 nibble reserved = 6-bit unsigned value set to 63
/// -> 1/2 nibble NAL length = 2-bit length byte size type
/// - 1 byte = 0 ; 2 bytes = 1 ; 4 bytes = 3
/// -> 1 byte number of SPS = 8-bit unsigned total
/// -> 2+ bytes SPS length = short unsigned length
/// -> + SPS NAL unit = hexdump
/// -> 1 byte number of PPS = 8-bit unsigned total
/// -> 2+ bytes PPS length = short unsigned length
/// -> + PPS NAL unit = hexdump
/// </para>
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_avc_config_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("AVC config");
log.Debug(string.Format("Offset: {0}", bitstream.Offset));
#endif
//store the decoder config bytes
videoConfigBytes = new byte[(int)_size];
for (int b = 0; b < videoConfigBytes.Length; b++)
{
videoConfigBytes[b] = (byte)bitstream.ReadBytes(1);
switch (b)
{
//0 / version
case 1: //profile
avcProfile = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC profile: {0}", avcProfile));
#endif
break;
case 2: //compatible profile
int avcCompatProfile = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC compatible profile: {0}", avcCompatProfile));
#endif
break;
case 3: //avc level
avcLevel = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC level: {0}", avcLevel));
#endif
break;
case 4: //NAL length
break;
case 5: //SPS number
int numberSPS = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("Number of SPS: {0}", numberSPS));
#endif
break;
default:
break;
}
_bytesRead++;
}
return(_bytesRead);
}
/// <summary>
/// Loads ChunkOffset atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_chunk_offset_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
long chunkOffset = bitstream.ReadBytes(4);
chunks.Add(chunkOffset);
_bytesRead += 4;
}
return(_bytesRead);
}
/// <summary>
/// Loads MP4VideoMediaHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_video_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if ((_size - _bytesRead) == 8)
{
graphicsMode = (int)bitstream.ReadBytes(2);
opColorRed = (int)bitstream.ReadBytes(2);
opColorGreen = (int)bitstream.ReadBytes(2);
opColorBlue = (int)bitstream.ReadBytes(2);
_bytesRead += 8;
}
return(_bytesRead);
}
/// <summary>
/// Loads MP4SampleToChunkAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sample_to_chunk_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int firstChunk = (int)bitstream.ReadBytes(4);
int samplesPerChunk = (int)bitstream.ReadBytes(4);
int sampleDescriptionIndex = (int)bitstream.ReadBytes(4);
records.Add(new Record(firstChunk, samplesPerChunk, sampleDescriptionIndex));
_bytesRead += 12;
}
return(_bytesRead);
}
/// <summary>
/// Loads MP4TrackHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_track_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
#if !SILVERLIGHT
log.Debug(string.Format("Version: {0}", version));
#endif
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
trackId = bitstream.ReadBytes(4);
bitstream.SkipBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 32;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
trackId = bitstream.ReadBytes(4);
bitstream.SkipBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 20;
}
bitstream.SkipBytes(8); //reserved by Apple
int qt_layer = (int)bitstream.ReadBytes(2);
int qt_alternateGroup = (int)bitstream.ReadBytes(2);
int qt_volume = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Volume: {0}", qt_volume));
#endif
bitstream.SkipBytes(2); //reserved by Apple
long qt_matrixA = bitstream.ReadBytes(4);
long qt_matrixB = bitstream.ReadBytes(4);
long qt_matrixU = bitstream.ReadBytes(4);
long qt_matrixC = bitstream.ReadBytes(4);
long qt_matrixD = bitstream.ReadBytes(4);
long qt_matrixV = bitstream.ReadBytes(4);
long qt_matrixX = bitstream.ReadBytes(4);
long qt_matrixY = bitstream.ReadBytes(4);
long qt_matrixW = bitstream.ReadBytes(4);
qt_trackWidth = (int)bitstream.ReadBytes(4);
width = (qt_trackWidth >> 16);
qt_trackHeight = (int)bitstream.ReadBytes(4);
height = (qt_trackHeight >> 16);
_bytesRead += 60;
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 MP4SampleSizeAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sample_size_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
sampleSize = (int)bitstream.ReadBytes(4);
sampleCount = (int)bitstream.ReadBytes(4);
_bytesRead += 8;
if (sampleSize == 0)
{
for (int i = 0; i < sampleCount; i++)
{
int size = (int)bitstream.ReadBytes(4);
samples.Add(size);
_bytesRead += 4;
}
}
return(_bytesRead);
}
/// <summary>
/// Loads MovieHeader atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_movie_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 28;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 16;
}
int qt_preferredRate = (int)bitstream.ReadBytes(4);
int qt_preferredVolume = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(10);
long qt_matrixA = bitstream.ReadBytes(4);
long qt_matrixB = bitstream.ReadBytes(4);
long qt_matrixU = bitstream.ReadBytes(4);
long qt_matrixC = bitstream.ReadBytes(4);
long qt_matrixD = bitstream.ReadBytes(4);
long qt_matrixV = bitstream.ReadBytes(4);
long qt_matrixX = bitstream.ReadBytes(4);
long qt_matrixY = bitstream.ReadBytes(4);
long qt_matrixW = bitstream.ReadBytes(4);
long qt_previewTime = bitstream.ReadBytes(4);
long qt_previewDuration = bitstream.ReadBytes(4);
long qt_posterTime = bitstream.ReadBytes(4);
long qt_selectionTime = bitstream.ReadBytes(4);
long qt_selectionDuration = bitstream.ReadBytes(4);
long qt_currentTime = bitstream.ReadBytes(4);
long nextTrackID = bitstream.ReadBytes(4);
_bytesRead += 80;
return(_bytesRead);
}
/// <summary>
/// Loads MP4SyncSampleAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sync_sample_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Sync sample atom contains keyframe info");
#endif
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("Sync entries: {0}", entryCount));
#endif
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int sample = (int)bitstream.ReadBytes(4);
//log.trace("Sync entry: {}", sample);
syncSamples.Add(sample);
_bytesRead += 4;
}
return(_bytesRead);
}
/// <summary>
/// Loads Handler atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_handler_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
int qt_componentType = (int)bitstream.ReadBytes(4);
handlerType = (int)bitstream.ReadBytes(4);
int qt_componentManufacturer = (int)bitstream.ReadBytes(4);
int qt_componentFlags = (int)bitstream.ReadBytes(4);
int qt_componentFlagsMask = (int)bitstream.ReadBytes(4);
_bytesRead += 20;
int length = (int)(_size - _bytesRead - 1);
String trackName = bitstream.ReadString(length);
#if !SILVERLIGHT
log.Debug(string.Format("Track name: {0}", trackName));
#endif
_bytesRead += length;
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);
}
/// <summary>
/// Loads MP4TimeToSampleAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_time_to_sample_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Time to sample atom");
#endif
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("Time to sample entries: {0}", entryCount));
#endif
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int sampleCount = (int)bitstream.ReadBytes(4);
int sampleDuration = (int)bitstream.ReadBytes(4);
//log.trace("Sync entry: {}", sample);
timeToSamplesRecords.Add(new TimeSampleRecord(sampleCount, sampleDuration));
_bytesRead += 8;
}
return(_bytesRead);
}
/// <summary>
/// Loads CompactSampleSize atom from the input stream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_compact_sample_size_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
bitstream.SkipBytes(3);
sampleSize = 0;
fieldSize = (int)bitstream.ReadBytes(1);
sampleCount = (int)bitstream.ReadBytes(4);
_bytesRead += 8;
for (int i = 0; i < sampleCount; i++)
{
int size = 0;
switch (fieldSize)
{
case 4:
size = (int)bitstream.ReadBytes(1);
// TODO check the following code
samples.Add(size & 0x0f);
size = (size >> 4) & 0x0f;
i++;
_bytesRead += 1;
break;
case 8:
size = (int)bitstream.ReadBytes(1);
_bytesRead += 1;
break;
case 16:
size = (int)bitstream.ReadBytes(2);
_bytesRead += 2;
break;
}
if (i < sampleCount)
{
samples.Add(size);
}
}
return(_bytesRead);
}
/// <summary>
/// Loads the MP4DecoderConfigDescriptor from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
public void CreateDecoderConfigDescriptor(Mp4DataStream bitstream)
{
int objectTypeIndication = (int)bitstream.ReadBytes(1);
int value = (int)bitstream.ReadBytes(1);
bool upstream = (value & (1 << 1)) > 0;
byte streamType = (byte)(value >> 2);
value = (int)bitstream.ReadBytes(2);
int bufferSizeDB = value << 8;
value = (int)bitstream.ReadBytes(1);
bufferSizeDB |= value & 0xff;
int maxBitRate = (int)bitstream.ReadBytes(4);
int minBitRate = (int)bitstream.ReadBytes(4);
_bytesRead += 13;
if (_bytesRead < _size)
{
Mp4Descriptor descriptor = CreateDescriptor(bitstream);
_children.Add(descriptor);
_bytesRead += descriptor.BytesRead;
}
}
public static Mp4Descriptor CreateDescriptor(Mp4DataStream bitstream)
{
int tag = (int)bitstream.ReadBytes(1);
int bytesRead = 1;
int size = 0;
int b = 0;
do
{
b = (int)bitstream.ReadBytes(1);
size <<= 7;
size |= b & 0x7f;
bytesRead++;
} while ((b & 0x80) == 0x80);
Mp4Descriptor descriptor = new Mp4Descriptor(tag, size);
switch (tag)
{
case MP4ES_DescriptorTag:
descriptor.CreateESDescriptor(bitstream);
break;
case MP4DecoderConfigDescriptorTag:
descriptor.CreateDecoderConfigDescriptor(bitstream);
break;
case MP4DecSpecificInfoDescriptorTag:
descriptor.CreateDecSpecificInfoDescriptor(bitstream);
break;
default:
break;
}
bitstream.SkipBytes(descriptor._size - descriptor._bytesRead);
descriptor._bytesRead = bytesRead + descriptor._size;
return(descriptor);
}
/// <summary>
/// Loads MediaHeader atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 28;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 16;
}
int packedLanguage = (int)bitstream.ReadBytes(2);
int qt_quality = (int)bitstream.ReadBytes(2);
_bytesRead += 4;
return _bytesRead;
}
/// <summary>
/// Loads ChunkOffset atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_chunk_offset_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
long chunkOffset = bitstream.ReadBytes(4);
chunks.Add(chunkOffset);
_bytesRead += 4;
}
return _bytesRead;
}
/// <summary>
/// Loads Handler atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_handler_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
int qt_componentType = (int)bitstream.ReadBytes(4);
handlerType = (int)bitstream.ReadBytes(4);
int qt_componentManufacturer = (int)bitstream.ReadBytes(4);
int qt_componentFlags = (int)bitstream.ReadBytes(4);
int qt_componentFlagsMask = (int)bitstream.ReadBytes(4);
_bytesRead += 20;
int length = (int)(_size - _bytesRead - 1);
String trackName = bitstream.ReadString(length);
#if !SILVERLIGHT
log.Debug(string.Format("Track name: {0}", trackName));
#endif
_bytesRead += length;
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 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 MP4SampleSizeAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sample_size_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
sampleSize = (int)bitstream.ReadBytes(4);
sampleCount = (int)bitstream.ReadBytes(4);
_bytesRead += 8;
if (sampleSize == 0)
{
for (int i = 0; i < sampleCount; i++)
{
int size = (int)bitstream.ReadBytes(4);
samples.Add(size);
_bytesRead += 4;
}
}
return _bytesRead;
}
/// <summary>
/// Loads the version of the full atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_full_atom(Mp4DataStream bitstream)
{
long value = bitstream.ReadBytes(4);
version = (int)value >> 24;
flags = (int)value & 0xffffff;
_bytesRead += 4;
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 M4ESDAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_esd_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
esd_descriptor = Mp4Descriptor.CreateDescriptor(bitstream);
_bytesRead += esd_descriptor.BytesRead;
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;
}
public Mp4Reader(Stream stream)
{
_stream = stream;
_inputStream = new Mp4DataStream(_stream);
}
/// <summary>
/// Loads MP4TrackHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_track_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
#if !SILVERLIGHT
log.Debug(string.Format("Version: {0}", version));
#endif
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
trackId = bitstream.ReadBytes(4);
bitstream.SkipBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 32;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
trackId = bitstream.ReadBytes(4);
bitstream.SkipBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 20;
}
bitstream.SkipBytes(8); //reserved by Apple
int qt_layer = (int)bitstream.ReadBytes(2);
int qt_alternateGroup = (int)bitstream.ReadBytes(2);
int qt_volume = (int)bitstream.ReadBytes(2);
#if !SILVERLIGHT
log.Debug(string.Format("Volume: {0}", qt_volume));
#endif
bitstream.SkipBytes(2); //reserved by Apple
long qt_matrixA = bitstream.ReadBytes(4);
long qt_matrixB = bitstream.ReadBytes(4);
long qt_matrixU = bitstream.ReadBytes(4);
long qt_matrixC = bitstream.ReadBytes(4);
long qt_matrixD = bitstream.ReadBytes(4);
long qt_matrixV = bitstream.ReadBytes(4);
long qt_matrixX = bitstream.ReadBytes(4);
long qt_matrixY = bitstream.ReadBytes(4);
long qt_matrixW = bitstream.ReadBytes(4);
qt_trackWidth = (int)bitstream.ReadBytes(4);
width = (qt_trackWidth >> 16);
qt_trackHeight = (int)bitstream.ReadBytes(4);
height = (qt_trackHeight >> 16);
_bytesRead += 60;
return _bytesRead;
}
/// <summary>
/// Loads MP4TimeToSampleAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_time_to_sample_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Time to sample atom");
#endif
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("Time to sample entries: {0}", entryCount));
#endif
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int sampleCount = (int)bitstream.ReadBytes(4);
int sampleDuration = (int)bitstream.ReadBytes(4);
//log.trace("Sync entry: {}", sample);
timeToSamplesRecords.Add(new TimeSampleRecord(sampleCount, sampleDuration));
_bytesRead += 8;
}
return _bytesRead;
}
/// <summary>
/// Loads MP4SampleToChunkAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sample_to_chunk_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int firstChunk = (int)bitstream.ReadBytes(4);
int samplesPerChunk = (int)bitstream.ReadBytes(4);
int sampleDescriptionIndex = (int)bitstream.ReadBytes(4);
records.Add(new Record(firstChunk, samplesPerChunk, sampleDescriptionIndex));
_bytesRead += 12;
}
return _bytesRead;
}
/// <summary>
/// Loads MovieHeader atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_movie_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if (version == 1)
{
creationTime = createDate(bitstream.ReadBytes(8));
modificationTime = createDate(bitstream.ReadBytes(8));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(8);
_bytesRead += 28;
}
else
{
creationTime = createDate(bitstream.ReadBytes(4));
modificationTime = createDate(bitstream.ReadBytes(4));
timeScale = (int)bitstream.ReadBytes(4);
duration = bitstream.ReadBytes(4);
_bytesRead += 16;
}
int qt_preferredRate = (int)bitstream.ReadBytes(4);
int qt_preferredVolume = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(10);
long qt_matrixA = bitstream.ReadBytes(4);
long qt_matrixB = bitstream.ReadBytes(4);
long qt_matrixU = bitstream.ReadBytes(4);
long qt_matrixC = bitstream.ReadBytes(4);
long qt_matrixD = bitstream.ReadBytes(4);
long qt_matrixV = bitstream.ReadBytes(4);
long qt_matrixX = bitstream.ReadBytes(4);
long qt_matrixY = bitstream.ReadBytes(4);
long qt_matrixW = bitstream.ReadBytes(4);
long qt_previewTime = bitstream.ReadBytes(4);
long qt_previewDuration = bitstream.ReadBytes(4);
long qt_posterTime = bitstream.ReadBytes(4);
long qt_selectionTime = bitstream.ReadBytes(4);
long qt_selectionDuration = bitstream.ReadBytes(4);
long qt_currentTime = bitstream.ReadBytes(4);
long nextTrackID = bitstream.ReadBytes(4);
_bytesRead += 80;
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>
/// 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 MP4 reader from file input stream, sets up metadata generation flag.
/// </summary>
/// <param name="file"></param>
public Mp4Reader(FileInfo file)
{
//_file = file;
_stream = new FileStream(file.FullName, FileMode.Open);
_inputStream = new Mp4DataStream(_stream);
//Decode all the info that we want from the atoms
DecodeHeader();
//Analyze the samples/chunks and build the keyframe meta data
AnalyzeFrames();
//Add meta data
_firstTags.AddLast(CreateFileMeta());
//Create / add the pre-streaming (decoder config) tags
CreatePreStreamingTags();
}
/// <summary>
/// Loads CompactSampleSize atom from the input stream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_compact_sample_size_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
bitstream.SkipBytes(3);
sampleSize = 0;
fieldSize = (int)bitstream.ReadBytes(1);
sampleCount = (int)bitstream.ReadBytes(4);
_bytesRead += 8;
for (int i = 0; i < sampleCount; i++)
{
int size = 0;
switch (fieldSize)
{
case 4:
size = (int)bitstream.ReadBytes(1);
// TODO check the following code
samples.Add(size & 0x0f);
size = (size >> 4) & 0x0f;
i++;
_bytesRead += 1;
break;
case 8:
size = (int)bitstream.ReadBytes(1);
_bytesRead += 1;
break;
case 16:
size = (int)bitstream.ReadBytes(2);
_bytesRead += 2;
break;
}
if (i < sampleCount)
{
samples.Add(size);
}
}
return _bytesRead;
}
/// <summary>
/// Loads the MP4ES_Descriptor from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
public void CreateESDescriptor(Mp4DataStream bitstream)
{
int ES_ID = (int)bitstream.ReadBytes(2);
int flags = (int)bitstream.ReadBytes(1);
bool streamDependenceFlag = (flags & (1 << 7)) != 0;
bool urlFlag = (flags & (1 << 6)) != 0;
bool ocrFlag = (flags & (1 << 5)) != 0;
_bytesRead += 3;
if (streamDependenceFlag)
{
bitstream.SkipBytes(2);
_bytesRead += 2;
}
if (urlFlag)
{
int str_size = (int)bitstream.ReadBytes(1);
bitstream.ReadString(str_size);
_bytesRead += str_size + 1;
}
if (ocrFlag)
{
bitstream.SkipBytes(2);
_bytesRead += 2;
}
while (_bytesRead < _size)
{
Mp4Descriptor descriptor = CreateDescriptor(bitstream);
_children.Add(descriptor);
_bytesRead += descriptor.BytesRead;
}
}
/// <summary>
/// Loads MP4SyncSampleAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sync_sample_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("Sync sample atom contains keyframe info");
#endif
create_full_atom(bitstream);
entryCount = (int)bitstream.ReadBytes(4);
#if !SILVERLIGHT
log.Debug(string.Format("Sync entries: {0}", entryCount));
#endif
_bytesRead += 4;
for (int i = 0; i < entryCount; i++)
{
int sample = (int)bitstream.ReadBytes(4);
//log.trace("Sync entry: {}", sample);
syncSamples.Add(sample);
_bytesRead += 4;
}
return _bytesRead;
}
/// <summary>
/// Loads the MP4DecoderConfigDescriptor from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
public void CreateDecoderConfigDescriptor(Mp4DataStream bitstream)
{
int objectTypeIndication = (int)bitstream.ReadBytes(1);
int value = (int)bitstream.ReadBytes(1);
bool upstream = (value & (1 << 1)) > 0;
byte streamType = (byte)(value >> 2);
value = (int)bitstream.ReadBytes(2);
int bufferSizeDB = value << 8;
value = (int)bitstream.ReadBytes(1);
bufferSizeDB |= value & 0xff;
int maxBitRate = (int)bitstream.ReadBytes(4);
int minBitRate = (int)bitstream.ReadBytes(4);
_bytesRead += 13;
if (_bytesRead < _size)
{
Mp4Descriptor descriptor = CreateDescriptor(bitstream);
_children.Add(descriptor);
_bytesRead += descriptor.BytesRead;
}
}
/// <summary>
/// Loads MP4SoundMediaHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_sound_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
balance = (int)bitstream.ReadBytes(2);
bitstream.SkipBytes(2);
_bytesRead += 4;
return _bytesRead;
}
public void CreateDecSpecificInfoDescriptor(Mp4DataStream bitstream)
{
decSpecificDataOffset = bitstream.Offset;
dsid = new byte[_size];
for (int b = 0; b < _size; b++)
{
dsid[b] = (byte)bitstream.ReadBytes(1);
_bytesRead++;
}
decSpecificDataSize = _size - _bytesRead;
}
/// <summary>
/// Loads MP4VideoMediaHeaderAtom atom from the input bitstream.
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_video_media_header_atom(Mp4DataStream bitstream)
{
create_full_atom(bitstream);
if ((_size - _bytesRead) == 8)
{
graphicsMode = (int)bitstream.ReadBytes(2);
opColorRed = (int)bitstream.ReadBytes(2);
opColorGreen = (int)bitstream.ReadBytes(2);
opColorBlue = (int)bitstream.ReadBytes(2);
_bytesRead += 8;
}
return _bytesRead;
}
/// <summary>
/// Loads AVCC atom from the input bitstream.
/// <para>
/// 8+ bytes ISO/IEC 14496-10 or 3GPP AVC decode config box
/// = long unsigned offset + long ASCII text string 'avcC'
/// -> 1 byte version = 8-bit hex version (current = 1)
/// -> 1 byte H.264 profile = 8-bit unsigned stream profile
/// -> 1 byte H.264 compatible profiles = 8-bit hex flags
/// -> 1 byte H.264 level = 8-bit unsigned stream level
/// -> 1 1/2 nibble reserved = 6-bit unsigned value set to 63
/// -> 1/2 nibble NAL length = 2-bit length byte size type
/// - 1 byte = 0 ; 2 bytes = 1 ; 4 bytes = 3
/// -> 1 byte number of SPS = 8-bit unsigned total
/// -> 2+ bytes SPS length = short unsigned length
/// -> + SPS NAL unit = hexdump
/// -> 1 byte number of PPS = 8-bit unsigned total
/// -> 2+ bytes PPS length = short unsigned length
/// -> + PPS NAL unit = hexdump
/// </para>
/// </summary>
/// <param name="bitstream">The input bitstream.</param>
/// <returns>The number of bytes loaded.</returns>
public long create_avc_config_atom(Mp4DataStream bitstream)
{
#if !SILVERLIGHT
log.Debug("AVC config");
log.Debug(string.Format("Offset: {0}", bitstream.Offset));
#endif
//store the decoder config bytes
videoConfigBytes = new byte[(int)_size];
for (int b = 0; b < videoConfigBytes.Length; b++)
{
videoConfigBytes[b] = (byte)bitstream.ReadBytes(1);
switch (b)
{
//0 / version
case 1: //profile
avcProfile = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC profile: {0}", avcProfile));
#endif
break;
case 2: //compatible profile
int avcCompatProfile = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC compatible profile: {0}", avcCompatProfile));
#endif
break;
case 3: //avc level
avcLevel = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("AVC level: {0}", avcLevel));
#endif
break;
case 4: //NAL length
break;
case 5: //SPS number
int numberSPS = videoConfigBytes[b];
#if !SILVERLIGHT
log.Debug(string.Format("Number of SPS: {0}", numberSPS));
#endif
break;
default:
break;
}
_bytesRead++;
}
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>
/// 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);
}
