private void ReadFrameFooter()
{
ushort crc16 = bitReader.Complete();
bitReader = null;
byte[] data = ReadExactly(2);
int footerCrc16 = data[0] << 8 | data[1];
if (crc16 != footerCrc16)
{
throw new FlacException("Invalid frame footer CRC16");
}
subframeIndex = 0;
this.recordType = FlacRecordType.FrameFooter;
}
public byte[] ReadFrameRawData()
{
if (recordType != FlacRecordType.Frame)
{
throw new FlacException("Cannot read non-frame data");
}
MemoryStream ms = new MemoryStream();
ms.Write(lastFrameHeaderData, 0, lastFrameHeaderData.Length);
// replace bitReader
ushort currentCrc16 = bitReader.Complete();
bitReader = new FlacBitStreamReader(
new SinkedStream(BaseStream, ms), currentCrc16);
// read subframes
for (int i = 0; i < FrameChannelCount; i++)
{
ReadSubframe();
SkipSampleValues();
}
bitReader.Complete();
bitReader = null;
// read footer
byte[] crc16 = ReadExactly(2);
recordType = FlacRecordType.FrameFooter;
int frameDataLength = checked ((int)ms.Length);
ms.Write(crc16, 0, crc16.Length);
byte[] frameData = ms.ToArray();
// check CRC16
ushort dataCrc16 = CrcUtils.Crc16(0, frameData, 0, frameDataLength);
int footerCrc = (crc16[0] << 8) | crc16[1];
if (dataCrc16 != footerCrc)
{
throw new FlacException("Invalid frame footer CRC16");
}
return(frameData);
}
public byte[] ReadFrameRawData()
{
if(recordType != FlacRecordType.Frame)
throw new FlacException("Cannot read non-frame data");
MemoryStream ms = new MemoryStream();
ms.Write(lastFrameHeaderData, 0, lastFrameHeaderData.Length);
// replace bitReader
ushort currentCrc16 = bitReader.Complete();
bitReader = new FlacBitStreamReader(
new SinkedStream(BaseStream, ms), currentCrc16);
// read subframes
for (int i = 0; i < FrameChannelCount; i++)
{
ReadSubframe();
SkipSampleValues();
}
bitReader.Complete();
bitReader = null;
// read footer
byte[] crc16 = ReadExactly(2);
recordType = FlacRecordType.FrameFooter;
int frameDataLength = checked((int)ms.Length);
ms.Write(crc16, 0, crc16.Length);
byte[] frameData = ms.ToArray();
// check CRC16
ushort dataCrc16 = CrcUtils.Crc16(0, frameData, 0, frameDataLength);
int footerCrc = (crc16[0] << 8) | crc16[1];
if(dataCrc16 != footerCrc)
throw new FlacException("Invalid frame footer CRC16");
return frameData;
}
