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optimizations

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This commit is contained in:
chudov
2010-11-25 09:11:07 +00:00
parent 8857259a5f
commit a38c14f15c
2 changed files with 39 additions and 6 deletions
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8
CUETools.Codecs/BitWriter.cs
View File

@@ -56,19 +56,21 @@ namespace CUETools.Codecs
writebits(8, c);
}
public unsafe void writeints(int len, byte* buf)
public unsafe void writeints(int len, int pos, byte* buf)
{
int old_pos = BitLength;
int start = old_pos / 8;
int start1 = pos / 8;
int end = (old_pos + len) / 8;
int end1 = (pos + len) / 8;
flush();
byte start_val = old_pos % 8 != 0 ? buffer[start] : (byte)0;
fixed (byte* buf1 = &buffer[0])
AudioSamples.MemCpy(buf1 + start, buf + start, end - start);
AudioSamples.MemCpy(buf1 + start, buf + start1, end - start);
buffer[start] |= start_val;
buf_ptr = end;
if ((old_pos + len) % 8 != 0)
writebits((old_pos + len) % 8, buf[end] >> (8 - ((old_pos + len) % 8)));
writebits((old_pos + len) % 8, buf[end1] >> (8 - ((old_pos + len) % 8)));
}
public void write(params char [] chars)

37
CUETools.Codecs/Codecs.cs
View File

@@ -695,6 +695,12 @@ namespace CUETools.Codecs
*(res++) = *(smp++);
}
unsafe public static void MemCpy(long* res, long* smp, int n)
{
for (int i = n; i > 0; i--)
*(res++) = *(smp++);
}
unsafe public static void MemCpy(short* res, short* smp, int n)
{
for (int i = n; i > 0; i--)
@@ -703,8 +709,26 @@ namespace CUETools.Codecs
unsafe public static void MemCpy(byte* res, byte* smp, int n)
{
if ((((IntPtr)smp).ToInt64() & 3) == 0 && (((IntPtr)res).ToInt64() & 3) == 0 && n > 4)
if ((((IntPtr)smp).ToInt64() & 7) == (((IntPtr)res).ToInt64() & 7) && n > 32)
{
int delta = (int)((8 - (((IntPtr)smp).ToInt64() & 7)) & 7);
for (int i = delta; i > 0; i--)
*(res++) = *(smp++);
n -= delta;
MemCpy((long*)res, (long*)smp, n >> 3);
int n8 = (n >> 3) << 3;
n -= n8;
smp += n8;
res += n8;
}
if ((((IntPtr)smp).ToInt64() & 3) == (((IntPtr)res).ToInt64() & 3) && n > 16)
{
int delta = (int)((4 - (((IntPtr)smp).ToInt64() & 3)) & 3);
for (int i = delta; i > 0; i--)
*(res++) = *(smp++);
n -= delta;
MemCpy((int*)res, (int*)smp, n >> 2);
int n4 = (n >> 2) << 2;
n -= n4;
@@ -891,14 +915,21 @@ namespace CUETools.Codecs
{
private long _sampleOffset, _sampleCount;
private AudioPCMConfig pcm;
private int _sampleVal;
public SilenceGenerator(long sampleCount)
public SilenceGenerator(long sampleCount, int sampleVal)
{
_sampleVal = sampleVal;
_sampleOffset = 0;
_sampleCount = sampleCount;
pcm = AudioPCMConfig.RedBook;
}
public SilenceGenerator(long sampleCount)
: this(sampleCount, 0)
{
}
public long Length
{
get
@@ -936,7 +967,7 @@ namespace CUETools.Codecs
int[,] samples = buff.Samples;
for (int i = 0; i < buff.Length; i++)
for (int j = 0; j < PCM.ChannelCount; j++)
samples[i, j] = 0;
samples[i, j] = _sampleVal;
_sampleOffset += buff.Length;
return buff.Length;