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ALAC encoder

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This commit is contained in:
chudov
2009-08-30 21:58:54 +00:00
parent 2b7312e261
commit 5e37052bc1
18 changed files with 2225 additions and 259 deletions
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97
CUETools.Codecs.ALAC/ALACDotNet.cs
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@@ -42,6 +42,24 @@ namespace CUETools.Codecs.ALAC
calculate_length();
}
public ALACReader(int channels, int bps, int rice_historymult, int rice_initialhistory, int rice_kmodifier, int blocksize)
{
_channelCount = channels;
_bitsPerSample = bps;
_sampleRate = 44100;
setinfo_max_samples_per_frame = (uint)blocksize;
setinfo_rice_historymult = (byte)rice_historymult;
setinfo_rice_initialhistory = (byte)rice_initialhistory;
setinfo_rice_kmodifier = (byte)rice_kmodifier;
_predicterror_buffer_a = new int[setinfo_max_samples_per_frame];
_predicterror_buffer_b = new int[setinfo_max_samples_per_frame];
_outputsamples_buffer_a = new int[setinfo_max_samples_per_frame];
_outputsamples_buffer_b = new int[setinfo_max_samples_per_frame];
_framesBuffer = new byte[65536];
}
public int[,] Read(int[,] buff)
{
return AudioSamples.Read(this, buff);
@@ -96,7 +114,7 @@ namespace CUETools.Codecs.ALAC
return (uint)offset;
get_sample_info(_iSample, out sampleDuration, out sampleSize);
_IO.Read(_framesBuffer, 0, (int) sampleSize);
decodeFrame(sampleDuration, sampleSize);
decodeFrame(sampleSize);
if (sampleDuration != _samplesInBuffer)
throw new Exception("sample count mismatch");
_samplesInBuffer -= _samplesBufferOffset;
@@ -157,6 +175,8 @@ namespace CUETools.Codecs.ALAC
_IO.Position = _saved_mdat_pos + fileOffs;
return;
}
if ((int)_iSample >= _sample_byte_size.Length)
throw new Exception("seeking past end of stream");
get_sample_info(_iSample, out sampleDuration, out sampleSize);
durOffs += sampleDuration;
fileOffs += sampleSize;
@@ -225,6 +245,8 @@ namespace CUETools.Codecs.ALAC
while (_time_to_sample_count[duration_cur_index] + duration_index_accum <= iSample)
{
duration_index_accum += _time_to_sample_count[duration_cur_index];
if (duration_cur_index == _time_to_sample_count.Length - 1)
throw new Exception("seeking past end of stream");
duration_cur_index ++;
}
sampleDuration = _time_to_sample_duration[duration_cur_index];
@@ -250,7 +272,7 @@ namespace CUETools.Codecs.ALAC
get_sample_info(_iSample, out sampleDuration, out sampleSize);
InitTables();
_IO.Read(_framesBuffer, 0, (int)sampleSize);
decodeFrame(sampleDuration, sampleSize);
decodeFrame(sampleSize);
if (_samplesInBuffer < sampleDuration)
{
_time_to_sample_duration = new uint[2] { sample_duration_0, _samplesInBuffer };
@@ -395,11 +417,6 @@ namespace CUETools.Codecs.ALAC
return result;
}
private static uint SIGN_EXTENDED32(uint val, int bits)
{
return ((val << (32 - bits)) >> (32 - bits));
}
private void unreadbits(ref int pos, int bits)
{
int new_accumulator = (_bitaccumulator - bits);
@@ -412,7 +429,7 @@ namespace CUETools.Codecs.ALAC
private static int count_leading_zeroes(uint input)
{
int zeroes = 1;
int zeroes = 0;
uint shifted_input = input >> 16;
if (shifted_input == 0)
zeroes += 16;
@@ -423,22 +440,7 @@ namespace CUETools.Codecs.ALAC
zeroes += 8;
else
input = shifted_input;
shifted_input = input >> 4;
if (shifted_input == 0)
zeroes += 4;
else
input = shifted_input;
shifted_input = input >> 2;
if (shifted_input == 0)
zeroes += 2;
else
input = shifted_input;
shifted_input = input >> 1;
if (shifted_input == 0)
zeroes ++;
else
input = shifted_input;
return zeroes - (int)input;
return zeroes + BitReader.byte_to_unary_table[input];
}
private unsafe void readPredictor(ref int pos, ref predictor_t predictor_info)
@@ -462,30 +464,14 @@ namespace CUETools.Codecs.ALAC
private unsafe int decode_scalar(byte * buff, ref int pos, int k, int limit, int readsamplesize)
{
int x = 0;
uint next = peekbits_9(buff, pos);
if (next == 0x1ff) /* RICE THRESHOLD 9 bits */
int x = (next >> 8 == 0) ? 0 :
1 + BitReader.byte_to_unary_table[(~next) & 0xff];
if (x == 9) /* RICE THRESHOLD 9 bits */
{
skipbits(ref pos, 9);
return (int)readbits(buff, ref pos, readsamplesize);
}
if ((next & 0x1e0) == 0x1e0)
{
x += 4;
next <<= 4;
}
if ((next & 0x180) == 0x180)
{
x += 2;
next <<= 2;
}
if ((next & 0x100) == 0x100)
{
x += 1;
next <<= 1;
}
x += (int) (next & 0x100) >> 8;
//x = count_leading_zeroes((~next) & 0x1ff) - 23;
skipbits(ref pos, x + 1);
if (k >= limit)
k = limit;
@@ -637,7 +623,7 @@ namespace CUETools.Codecs.ALAC
}
}
private unsafe void deinterlace(int[,] samplesBuffer, uint offset, uint sampleCount)
internal unsafe void deinterlace(int[,] samplesBuffer, uint offset, uint sampleCount)
{
if (sampleCount <= 0 || sampleCount > _samplesInBuffer)
return;
@@ -670,17 +656,18 @@ namespace CUETools.Codecs.ALAC
}
/* otherwise basic interlacing took place */
for (i = 0; i < sampleCount; i++)
{
int a = buf_a[i];
int b = buf_b[i];
buf_s[i * 2] = a;
buf_s[i * 2 + 1] = b;
}
AudioSamples.Interlace(buf_s, buf_a, buf_b, (int)sampleCount);
}
}
private void decodeFrame(ulong sampleDuration, uint sampleSize)
internal int DecodeFrame(byte[] buffer, int pos, int len)
{
Array.Copy(buffer, pos, _framesBuffer, 0, len);
decodeFrame((uint)len);
return len; // pos
}
private void decodeFrame(uint sampleSize)
{
_bitaccumulator = 0;
int pos = 0;
@@ -723,8 +710,6 @@ namespace CUETools.Codecs.ALAC
else
{
/* not compressed, easy case */
if (_bitsPerSample != 16)
throw new Exception("Not 16 bit");
for (int i = 0; i < outputSamples; i++)
{
_outputsamples_buffer_a[i] = extend_sign32((int)readbits(_framesBuffer, ref pos, _bitsPerSample), _bitsPerSample);
@@ -735,8 +720,8 @@ namespace CUETools.Codecs.ALAC
_interlacing_leftweight = 0;
}
if (_bitsPerSample != 16)
throw new Exception("Not 16 bit");
if (readbits(_framesBuffer, ref pos, 3) != 7)
throw new Exception("Invalid frame.");
_samplesInBuffer = outputSamples;
}