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Mkv.cs
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Mkv.cs
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/*
* Copyright (c) 2007, 2008 dmz
*
* This file is part of TsRemux.
*
* TsRemux is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* TsRemux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with TsRemux. If not, see <http://www.gnu.org/licenses/>.
*
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.ComponentModel;
using System.Globalization;
namespace TsRemux
{
public enum LacingType
{
NoLacing = 0,
XiphLacing,
FixedSizeLacing,
EbmlLacing
}
public class EbmlElement
{
protected Int64 id;
protected Int64 size;
protected Int64 pos;
protected Stream fs;
public static EbmlElement ParseEbml(Stream fs)
{
Int64 pos = fs.Position;
EbmlElement ebml = null;
if (null == fs || fs.Length == 0)
return null;
int b = fs.ReadByte();
if (b == -1)
goto cleanup;
int len = VintLength((byte)b);
if ((fs.Length - fs.Position) < (Int64)len)
goto cleanup;
fs.Position -= 1;
Int64 id = 0;
for (int i = 0; i < len; i++)
{
id <<= 8;
id |= (byte)fs.ReadByte();
}
b = fs.ReadByte();
if (b == -1)
goto cleanup;
len = VintLength((byte)b);
if ((fs.Length - fs.Position) < (Int64)len)
goto cleanup;
fs.Position -= 1;
Int64 size = VintToInt64(fs);
if ((fs.Length - fs.Position) < size)
goto cleanup;
ebml = new EbmlElement(id, size, fs.Position, fs);
cleanup:
fs.Position = pos;
return ebml;
}
public Int64 Id
{
get
{
return id;
}
}
public Int64 Size
{
get
{
return size;
}
}
public Stream DataStream
{
get
{
fs.Position = pos;
return fs;
}
}
protected Int64 Position
{
get
{
return pos;
}
}
public EbmlElement[] Children
{
get
{
List<EbmlElement> kids = new List<EbmlElement>();
EbmlElement eb = null;
Stream fs = DataStream;
do
{
eb = ParseEbml(fs);
if (null != eb)
{
kids.Add(eb);
Int64 p = eb.Position + eb.Size;
fs.Position = p;
}
} while (eb != null && fs.Position < (pos + size));
return kids.ToArray();
}
}
protected EbmlElement(Int64 id, Int64 size, Int64 pos, Stream fs)
{
this.id = id;
this.size = size;
this.pos = pos;
this.fs = fs;
}
public static byte VintLength(byte vint)
{
byte len = 1;
for (int i = 7; (((vint >> i) & 0x01) == 0) && i >= 0; i--)
len++;
return len;
}
public static Int64 VintToInt64(Stream fs)
{
byte b = (byte)fs.ReadByte();
int len = VintLength(b);
Int64 ret = (((1 << (8 - len)) - 1) & b) << (8 * (len - 1));
for (int i = 1; i < len; i++)
ret += (((byte)fs.ReadByte()) << (8 * (len - 1 - i)));
return ret;
}
private static readonly Int64[] vsint_subtr = new Int64[8] {
0x3f, 0x1ffff, 0xfffff, 0x7ffffff, 0x3ffffffff,
0x1ffffffffff, 0xffffffffffffff, 0x7fffffffffffff };
protected static Int64 VsintToInt64(Stream fs)
{
int b = fs.ReadByte();
int len = VintLength((byte)b);
fs.Position -= 1;
Int64 ret = VintToInt64(fs);
return ret - vsint_subtr[len - 1];
}
}
public struct TrackInfo
{
public TrackInfo(ushort pid, string codec, byte[] data, EbmlElement info)
{
this.pid = pid;
this.codec = codec;
this.data = data;
this.info = info;
}
public ushort pid;
public string codec;
public byte[] data;
public EbmlElement info;
}
public class MkvPesFile : PesFile
{
private SortedList<Int64,EbmlElement> Clusters;
private int CurrentIndex;
private Dictionary<ushort, TrackInfo> TrackList;
public MkvPesFile(BackgroundWorker bw)
: base(bw)
{
Clusters = new SortedList<long, EbmlElement>();
TrackList = new Dictionary<ushort, TrackInfo>();
CurrentIndex = -1;
}
public override DTCP_Descriptor DtcpInfo
{
get { return null; }
}
protected override void GetInitialValues()
{
fs.Seek(0, SeekOrigin.Begin);
UInt32 header = 0xffffffff;
EbmlElement mkv = null;
byte b = 0;
for (int i = 0; i < Constants.DISK_BUFFER; i++)
{
int ib = fs.ReadByte();
if (ib == -1)
throw new FormatException("The specified file is too short");
b = (byte)(ib & 0xff);
header <<= 8;
header |= b;
if (header == Constants.MKVSEGMENT_START)
{
fs.Seek(-4, SeekOrigin.Current);
mkv = EbmlElement.ParseEbml(fs);
if (null == mkv)
throw new FormatException("Invalid/Corrupted MKV file");
break;
}
}
EbmlElement[] clusts = mkv.Children;
foreach (EbmlElement clust in clusts)
{
ReportProgress((int)(50 * clust.DataStream.Position / clust.DataStream.Length));
if (clust.Id == Constants.MKVCLUSTER_START)
{
Clusters.Add(GetClusterClock(clust), clust);
}
else if (clust.Id == Constants.MKVTRACKINFO_START)
{
EbmlElement[] tracks = clust.Children;
ushort id = 0;
List<StreamInfo> mkvStreams = new List<StreamInfo>();
foreach (EbmlElement track in tracks)
{
if (track.Id == 0xae)
{
EbmlElement[] trackAttributes = track.Children;
string codec = null;
ushort pid = 0;
UInt64 uid = 0;
byte[] data = null;
EbmlElement elementaryInfo = null;
foreach (EbmlElement trackAtt in trackAttributes)
{
switch (trackAtt.Id)
{
case 0xd7: // Track number
for (Int64 i = 0; i < trackAtt.Size; i++)
{
pid <<= 8;
pid |= (byte)fs.ReadByte();
}
break;
case 0x86: // Codec ID
byte[] cid = new byte[(int)trackAtt.Size];
trackAtt.DataStream.Read(cid, 0, (int)trackAtt.Size);
codec = Encoding.ASCII.GetString(cid);
break;
case 0x63a2: // Coded Private
data = new byte[(int)trackAtt.Size];
trackAtt.DataStream.Read(data, 0, (int)trackAtt.Size);
break;
case 0x73c5: // Track UID
for (Int64 i = 0; i < trackAtt.Size; i++)
{
uid <<= 8;
uid |= (byte)fs.ReadByte();
}
break;
case 0xe0: // Video elementary stream info
elementaryInfo = trackAtt;
break;
case 0xe1: // Audio elementary stream info
elementaryInfo = trackAtt;
break;
}
}
if (codec == null || pid == 0)
throw new FormatException("Track info is invalid");
if (0 == string.Compare(codec, "V_MPEG2", true, CultureInfo.InvariantCulture) ||
0 == string.Compare(codec, "V_MPEG4/ISO/AVC", true, CultureInfo.InvariantCulture) ||
0 == string.Compare(codec, "V_MS/VFW/FOURCC", true, CultureInfo.InvariantCulture) ||
0 == string.Compare(codec, "A_AC3", true, CultureInfo.InvariantCulture) ||
0 == string.Compare(codec, "A_DTS", true, CultureInfo.InvariantCulture))
{
id++;
TrackInfo ti = new TrackInfo(id, codec, data, elementaryInfo);
TrackList.Add(id, ti);
StreamInfo si = null;
if (0 == string.Compare(codec, "V_MPEG2", true, CultureInfo.InvariantCulture))
si = new StreamInfo(ElementaryStreamTypes.VIDEO_STREAM_MPEG2, id);
else if (0 == string.Compare(codec, "V_MPEG4/ISO/AVC", true, CultureInfo.InvariantCulture))
si = new StreamInfo(ElementaryStreamTypes.VIDEO_STREAM_H264, id);
else if (0 == string.Compare(codec, "V_MS/VFW/FOURCC", true, CultureInfo.InvariantCulture))
si = new StreamInfo(ElementaryStreamTypes.VIDEO_STREAM_VC1, id);
else if (0 == string.Compare(codec, "A_AC3", true, CultureInfo.InvariantCulture))
si = new StreamInfo(ElementaryStreamTypes.AUDIO_STREAM_AC3, id);
else if (0 == string.Compare(codec, "A_DTS", true, CultureInfo.InvariantCulture))
si = new StreamInfo(ElementaryStreamTypes.AUDIO_STREAM_DTS, id);
mkvStreams.Add(si);
}
}
}
if (mkvStreams.Count > 0)
sis = mkvStreams.ToArray();
}
}
GetTimeStamps();
CurrentIndex = 0;
}
private Int64 GetClusterClock(EbmlElement cluster)
{
Int64 clock = -1;
if(cluster.Id != Constants.MKVCLUSTER_START)
throw new FormatException("Bad cluster ID - Invalid/Corrupted MKV file");
EbmlElement[] children = cluster.Children;
foreach (EbmlElement time in children)
{
if (time.Id == Constants.MKVTIMECODE_START)
{
clock = 0;
Stream s = time.DataStream;
for (Int64 i = 0; i < time.Size; i++)
{
clock <<= 8;
clock |= (byte)fs.ReadByte();
}
break;
}
}
if (-1 == clock)
throw new FormatException("Could not find timecode in cluster.");
return clock;
}
private PesPacket BuildAc3Pes(Int64 timestamp, byte[] data, ushort pid)
{
List<byte> pes = new List<byte>();
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(Constants.PES_PRIVATE1);
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x84);
pes.Add(0x81);
pes.Add(0x08);
pes.Add(0x21);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(0x01);
pes.Add(0x81);
pes.Add(0x71);
PesHeader ph = new PesHeader(pes.ToArray());
ph.Pts = timestamp;
PesPacket pp = new PesPacket(ph.Data, 0, ph.Data.Length, pid);
pp.AddData(data, 0, data.Length);
pp.Complete = true;
return pp;
}
private PesPacket BuildDtsPes(Int64 timestamp, byte[] data, ushort pid)
{
return BuildAc3Pes(timestamp, data, pid);
}
private PesPacket BuildMpeg2Pes(Int64 timestamp, byte[] data, ushort pid)
{
List<byte> pes = new List<byte>();
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(Constants.PES_VIDEO);
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x84);
pes.Add(0x81);
pes.Add(0x05);
pes.Add(0x21);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(0x00);
pes.Add(0x01);
PesHeader ph = new PesHeader(pes.ToArray());
ph.Pts = timestamp;
PesPacket pp = new PesPacket(ph.Data, 0, ph.Data.Length, pid);
pp.AddData(data, 0, data.Length);
pp.Complete = true;
return pp;
}
private PesPacket BuildAvcPes(Int64 timestamp, byte[] data, ushort pid)
{
return BuildMpeg2Pes(timestamp, data, pid);
}
private PesPacket BuildVc1Pes(Int64 timestamp, byte[] data, ushort pid)
{
List<byte> pes = new List<byte>();
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(Constants.PES_VIDEO_VC1);
pes.Add(0x00);
pes.Add(0x00);
pes.Add(0x84);
pes.Add(0x81);
pes.Add(0x08);
pes.Add(0x21);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(0x00);
pes.Add(0x01);
pes.Add(0x01);
pes.Add(0x81);
pes.Add(0x55);
PesHeader ph = new PesHeader(pes.ToArray());
ph.Pts = timestamp;
PesPacket pp = new PesPacket(ph.Data, 0, ph.Data.Length, pid);
pp.AddData(data, 0, data.Length);
pp.Complete = true;
return pp;
}
public override PesPacket[] GetNextPesPackets()
{
if (CurrentIndex >= Clusters.Keys.Count)
return null;
EbmlElement cluster = Clusters[Clusters.Keys[CurrentIndex]];
EbmlElement[] blocks = cluster.Children;
List<PesPacket> packList = new List<PesPacket>();
Int64 clock = GetClusterClock(cluster);
if (pcrDelegate != null)
pcrDelegate(clock * (Constants.MPEG2TS_CLOCK_RATE / 1000));
foreach (EbmlElement bl in blocks)
{
EbmlElement block = null;
switch (bl.Id)
{
case 0xa0: // block group
EbmlElement[] cbls = bl.Children;
foreach (EbmlElement bl2 in cbls)
if (bl2.Id == 0xa1)
{
block = bl2;
break;
}
break;
case 0xa3:
block = bl;
break;
}
if (null != block)
{
Stream stm = block.DataStream;
Int64 endPos = stm.Position + block.Size;
Int64 track = EbmlElement.VintToInt64(stm);
Int16 time = (short)stm.ReadByte();
time <<= 8;
time += (short)stm.ReadByte();
Int64 pts = clock + time;
pts *= 90;
byte flags = (byte)stm.ReadByte();
LacingType lacing = (LacingType)((flags >> 1) & 0x03);
if (lacing != LacingType.NoLacing && lacing != LacingType.FixedSizeLacing)
throw new FormatException("Variable lacing is not yet supported");
if (lacing == LacingType.FixedSizeLacing)
stm.Position += 1;
byte[] data = new byte[endPos - stm.Position];
stm.Read(data, 0, (int)(endPos - stm.Position));
if (data.Length > 0 && TrackList.ContainsKey((ushort)track))
{
TrackInfo ti = TrackList[(ushort)track];
if (ptsDelegate != null)
ptsDelegate(pts, ti.pid);
switch (sis[(ushort)track - 1].StreamType)
{
case ElementaryStreamTypes.AUDIO_STREAM_AC3:
packList.Add(BuildAc3Pes(pts, data, ti.pid));
break;
case ElementaryStreamTypes.AUDIO_STREAM_DTS:
packList.Add(BuildDtsPes(pts, data, ti.pid));
break;
case ElementaryStreamTypes.VIDEO_STREAM_MPEG2:
packList.Add(BuildMpeg2Pes(pts, data, ti.pid));
break;
case ElementaryStreamTypes.VIDEO_STREAM_H264:
packList.Add(BuildAvcPes(pts, data, ti.pid));
break;
case ElementaryStreamTypes.VIDEO_STREAM_VC1:
packList.Add(BuildVc1Pes(pts, data, ti.pid));
break;
}
}
}
}
CurrentIndex++;
if(packList.Count == 0)
return null;
return packList.ToArray();
}
public override void Seek(long pcr)
{
if (-1 == pcr)
{
CurrentIndex = 0;
return;
}
CurrentIndex = Clusters.IndexOfKey(pcr);
if (-1 != CurrentIndex)
return;
Clusters.Add(pcr, null);
CurrentIndex = Clusters.IndexOfKey(pcr);
if (CurrentIndex > 0)
CurrentIndex--;
Clusters.Remove(pcr);
}
private void GetTimeStamps()
{
startPcr = GetClusterClock(Clusters[Clusters.Keys[0]]) * (Constants.MPEG2TS_CLOCK_RATE / 1000);
endPcr = GetClusterClock(Clusters[Clusters.Keys[Clusters.Keys.Count - 1]]) * (Constants.MPEG2TS_CLOCK_RATE / 1000);
}
}
}