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optimizations

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This commit is contained in:
chudov
2009-10-16 23:35:56 +00:00
parent 597ffdfa87
commit 28e8c70a9f
3 changed files with 288 additions and 288 deletions
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36
CUETools.Codecs.FLAKE/FlakeReader.cs
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@@ -40,6 +40,7 @@ namespace CUETools.Codecs.FLAKE
Crc8 crc8;
Crc16 crc16;
FlacFrame frame;
BitReader framereader;
int channels;
uint bits_per_sample;
int sample_rate = 44100;
@@ -53,9 +54,23 @@ namespace CUETools.Codecs.FLAKE
ulong _sampleCount = 0;
ulong _sampleOffset = 0;
bool do_crc = true;
string _path;
Stream _IO;
public bool DoCRC
{
get
{
return do_crc;
}
set
{
do_crc = value;
}
}
public int[] Samples
{
get
@@ -76,6 +91,7 @@ namespace CUETools.Codecs.FLAKE
decode_metadata();
frame = new FlacFrame(channels);
framereader = new BitReader();
//max_frame_size = 16 + ((Flake.MAX_BLOCKSIZE * (int)(bits_per_sample * channels + 1) + 7) >> 3);
if (((int)max_frame_size * (int)bits_per_sample * channels * 2 >> 3) > _framesBuffer.Length)
@@ -105,6 +121,7 @@ namespace CUETools.Codecs.FLAKE
samplesBuffer = new int[Flake.MAX_BLOCKSIZE * channels];
residualBuffer = new int[Flake.MAX_BLOCKSIZE * channels];
frame = new FlacFrame(channels);
framereader = new BitReader();
}
public void Close()
@@ -344,9 +361,9 @@ namespace CUETools.Codecs.FLAKE
throw new Exception("invalid channel mode");
// CRC-8 of frame header
byte crc = crc8.ComputeChecksum(bitreader.Buffer, header_start, bitreader.Position - header_start);
byte crc = do_crc ? crc8.ComputeChecksum(bitreader.Buffer, header_start, bitreader.Position - header_start) : (byte)0;
frame.crc8 = (byte)bitreader.readbits(8);
if (frame.crc8 != crc)
if (do_crc && frame.crc8 != crc)
throw new Exception("header crc mismatch");
}
@@ -617,16 +634,17 @@ namespace CUETools.Codecs.FLAKE
{
fixed (byte* buf = buffer)
{
BitReader bitreader = new BitReader(buf, pos, len);
decode_frame_header(bitreader, frame);
decode_subframes(bitreader, frame);
bitreader.flush();
ushort crc = crc16.ComputeChecksum(bitreader.Buffer + pos, bitreader.Position - pos);
if (crc != bitreader.readbits(16))
framereader.Reset(buf, pos, len);
decode_frame_header(framereader, frame);
decode_subframes(framereader, frame);
framereader.flush();
ushort crc_1 = do_crc ? crc16.ComputeChecksum(framereader.Buffer + pos, framereader.Position - pos) : (ushort)0;
ushort crc_2 = (ushort)framereader.readbits(16);
if (do_crc && crc_1 != crc_2)
throw new Exception("frame crc mismatch");
restore_samples(frame);
_samplesInBuffer = (uint)frame.blocksize;
return bitreader.Position - pos;
return framereader.Position - pos;
}
}