private void readPaktChunk(BinaryReader source)
{
long nbPackets = StreamUtils.DecodeBEInt64(source.ReadBytes(8));
long nbFrames = StreamUtils.DecodeBEInt64(source.ReadBytes(8));
//duration = nbFrames * channelsPerFrame * bitsPerChannel / 8;
duration = nbFrames * 1000d / sampleRate;
}
public void StreamUtils_LongConverters()
{
ulong longValue = 0x45976248;
byte[] byteValue = BitConverter.GetBytes(longValue);
Assert.AreEqual(longValue, StreamUtils.DecodeUInt64(byteValue));
byteValue = StreamUtils.EncodeBEUInt64(longValue);
Assert.AreEqual((long)longValue, StreamUtils.DecodeBEInt64(byteValue));
}
// WARNING : EXPERIMENTAL / UNTESTED DUE TO THE LACK OF METADATA-RICH SAMPLE FILES
private void readStringsChunk(BinaryReader source)
{
uint nbEntries = StreamUtils.DecodeBEUInt32(source.ReadBytes(4));
Dictionary <uint, long> stringIds = new Dictionary <uint, long>();
for (int i = 0; i < nbEntries; i++)
{
uint stringId = StreamUtils.DecodeBEUInt32(source.ReadBytes(4));
long stringOffset = StreamUtils.DecodeBEInt64(source.ReadBytes(8));
stringIds.Add(stringId, stringOffset);
}
long initialPos = source.BaseStream.Position;
string stringValue;
foreach (uint id in stringIds.Keys)
{
source.BaseStream.Seek(initialPos + stringIds[id], SeekOrigin.Begin);
stringValue = StreamUtils.ReadNullTerminatedString(source, Encoding.UTF8);
SetMetaField("str-" + id, stringValue, true);
}
}
protected override bool read(BinaryReader source, ReadTagParams readTagParams)
{
ResetData();
source.BaseStream.Seek(0, SeekOrigin.Begin);
bool result = readFileHeader(source);
long cursorPos = source.BaseStream.Position;
long audioChunkSize = 0;
// Iterate through chunks
while (cursorPos < source.BaseStream.Length)
{
string chunkType = Utils.Latin1Encoding.GetString(source.ReadBytes(4));
long chunkSize = StreamUtils.DecodeBEInt64(source.ReadBytes(8));
if (readTagParams.PrepareForWriting)
{
structureHelper.AddZone(cursorPos, chunkSize + 12, chunkType);
}
switch (chunkType)
{
case CHUNK_AUDIO_DESC:
readAudioDescriptionChunk(source);
break;
case CHUNK_CHANNEL_LAYOUT:
readChannelLayoutChunk(source);
break;
case CHUNK_COOKIE:
case CHUNK_UMID:
if (readTagParams.PrepareForWriting || readTagParams.ReadAllMetaFrames)
{
readStringChunk(source, chunkType, chunkSize);
}
break;
case CHUNK_STRINGS:
if (readTagParams.PrepareForWriting || readTagParams.ReadAllMetaFrames)
{
readStringsChunk(source);
}
break;
case CHUNK_INFO:
readInfoChunk(source, readTagParams.PrepareForWriting || readTagParams.ReadAllMetaFrames);
break;
case CHUNK_AUDIO:
AudioDataOffset = cursorPos;
audioChunkSize = chunkSize;
AudioDataSize = chunkSize + 12;
if (secondsPerByte > 0)
{
duration = chunkSize * secondsPerByte * 1000;
}
break;
case CHUNK_PACKET_TABLE:
if (0 == secondsPerByte)
{
readPaktChunk(source);
}
break;
}
source.BaseStream.Seek(cursorPos + chunkSize + 12, SeekOrigin.Begin);
cursorPos = source.BaseStream.Position;
}
bitrate = audioChunkSize * 8d / duration;
if (null == channelsArrangement)
{
if (1 == channelsPerFrame)
{
channelsArrangement = MONO;
}
else if (2 == channelsPerFrame)
{
channelsArrangement = STEREO;
}
else
{
channelsArrangement = new ChannelsArrangement((int)channelsPerFrame, "Custom layout (" + channelsPerFrame + " channels)");
}
}
return(result);
}
public void StreamUtils_Exceptions()
{
Assert.IsFalse(StreamUtils.ArrEqualsArr(new byte[1], new byte[2]));
Assert.IsFalse(StreamUtils.StringEqualsArr(".", new char[2]));
try
{
StreamUtils.DecodeBEUInt16(new byte[1]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeUInt16(new byte[1]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeInt16(new byte[1]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEInt16(new byte[1]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEInt24(new byte[2]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEUInt24(new byte[2]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.EncodeBEUInt24(0x01FFFFFF);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEUInt32(new byte[3]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeUInt32(new byte[3]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEInt32(new byte[3]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeInt32(new byte[3]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeUInt64(new byte[7]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeBEInt64(new byte[7]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeSynchSafeInt(new byte[6]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.DecodeSynchSafeInt32(new byte[6]);
Assert.Fail();
}
catch { }
try
{
StreamUtils.EncodeSynchSafeInt(1, 0);
Assert.Fail();
}
catch { }
try
{
StreamUtils.EncodeSynchSafeInt(1, 6);
Assert.Fail();
}
catch { }
try
{
StreamUtils.ReadBits(new BinaryReader(new MemoryStream()), 0, 0);
Assert.Fail();
}
catch { }
try
{
StreamUtils.ReadBits(new BinaryReader(new MemoryStream()), 0, 33);
Assert.Fail();
}
catch { }
}
