private void initialize(Header header)
{
// REVIEW: allow customizable scale factor
float scalefactor = 32700.0f;
int mode = header.mode();
int layer = header.layer();
int channels = mode == Header.SINGLE_CHANNEL?1:2;
// set up output buffer if not set up by client.
if (output == null)
{
output = new SampleBuffer(header.frequency(), channels);
}
float[] factors = equalizer.BandFactors;
//Console.WriteLine("NOT CREATING SYNTHESIS FILTERS");
filter1 = new SynthesisFilter(0, scalefactor, factors);
// REVIEW: allow mono output for stereo
if (channels == 2)
{
filter2 = new SynthesisFilter(1, scalefactor, factors);
}
outputChannels = channels;
outputFrequency = header.frequency();
initialized = true;
}
public virtual void create(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb, Obuffer buffer0, int which_ch0)
{
stream = stream0;
header = header0;
filter1 = filtera;
filter2 = filterb;
buffer = buffer0;
which_channels = which_ch0;
}
public virtual void create(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb, Obuffer buffer0, int which_ch0)
{
stream = stream0;
header = header0;
filter1 = filtera;
filter2 = filterb;
buffer = buffer0;
which_channels = which_ch0;
}
private void initialize(Header header)
{
// REVIEW: allow customizable scale factor
float scalefactor = 32700.0f;
int mode = header.mode();
int layer = header.layer();
int channels = mode == Header.SINGLE_CHANNEL?1:2;
// set up output buffer if not set up by client.
if (output == null)
output = new SampleBuffer(header.frequency(), channels);
float[] factors = equalizer.BandFactors;
//Console.WriteLine("NOT CREATING SYNTHESIS FILTERS");
filter1 = new SynthesisFilter(0, scalefactor, factors);
// REVIEW: allow mono output for stereo
if (channels == 2)
filter2 = new SynthesisFilter(1, scalefactor, factors);
outputChannels = channels;
outputFrequency = header.frequency();
initialized = true;
}
/// <summary> Constructor.
/// </summary>
// REVIEW: these constructor arguments should be moved to the
// decodeFrame() method, where possible, so that one
public LayerIIIDecoder(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb, Obuffer buffer0, int which_ch0)
{
InitBlock();
huffcodetab.inithuff();
is_1d = new int[SBLIMIT * SSLIMIT + 4];
ro = new float[2][][];
for (int i = 0; i < 2; i++)
{
ro[i] = new float[SBLIMIT][];
for (int i2 = 0; i2 < SBLIMIT; i2++)
{
ro[i][i2] = new float[SSLIMIT];
}
}
lr = new float[2][][];
for (int i3 = 0; i3 < 2; i3++)
{
lr[i3] = new float[SBLIMIT][];
for (int i4 = 0; i4 < SBLIMIT; i4++)
{
lr[i3][i4] = new float[SSLIMIT];
}
}
out_1d = new float[SBLIMIT * SSLIMIT];
prevblck = new float[2][];
for (int i5 = 0; i5 < 2; i5++)
{
prevblck[i5] = new float[SBLIMIT * SSLIMIT];
}
k = new float[2][];
for (int i6 = 0; i6 < 2; i6++)
{
k[i6] = new float[SBLIMIT * SSLIMIT];
}
nonzero = new int[2];
//III_scalefact_t
III_scalefac_t = new temporaire2[2];
III_scalefac_t[0] = new temporaire2();
III_scalefac_t[1] = new temporaire2();
scalefac = III_scalefac_t;
// L3TABLE INIT
sfBandIndex = new SBI[9]; // SZD: MPEG2.5 +3 indices
int[] l0 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576};
int[] s0 = new int[]{0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192};
int[] l1 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 330, 394, 464, 540, 576};
int[] s1 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192};
int[] l2 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576};
int[] s2 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l3 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576};
int[] s3 = new int[]{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192};
int[] l4 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576};
int[] s4 = new int[]{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192};
int[] l5 = new int[]{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576};
int[] s5 = new int[]{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192};
// SZD: MPEG2.5
int[] l6 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576};
int[] s6 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l7 = new int[]{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576};
int[] s7 = new int[]{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l8 = new int[]{0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576};
int[] s8 = new int[]{0, 8, 16, 24, 36, 52, 72, 96, 124, 160, 162, 164, 166, 192};
sfBandIndex[0] = new SBI(l0, s0);
sfBandIndex[1] = new SBI(l1, s1);
sfBandIndex[2] = new SBI(l2, s2);
sfBandIndex[3] = new SBI(l3, s3);
sfBandIndex[4] = new SBI(l4, s4);
sfBandIndex[5] = new SBI(l5, s5);
//SZD: MPEG2.5
sfBandIndex[6] = new SBI(l6, s6);
sfBandIndex[7] = new SBI(l7, s7);
sfBandIndex[8] = new SBI(l8, s8);
// END OF L3TABLE INIT
if (reorder_table == null)
{
// SZD: generate LUT
reorder_table = new int[9][];
for (int i = 0; i < 9; i++)
reorder_table[i] = reorder(sfBandIndex[i].s);
}
// Sftable
int[] ll0 = new int[]{0, 6, 11, 16, 21};
int[] ss0 = new int[]{0, 6, 12};
sftable = new Sftable(this, ll0, ss0);
// END OF Sftable
// scalefac_buffer
scalefac_buffer = new int[54];
// END OF scalefac_buffer
stream = stream0;
header = header0;
filter1 = filtera;
filter2 = filterb;
buffer = buffer0;
which_channels = which_ch0;
frame_start = 0;
channels = (header.mode() == Header.SINGLE_CHANNEL)?1:2;
max_gr = (header.version() == Header.MPEG1)?2:1;
sfreq = header.sample_frequency() + ((header.version() == Header.MPEG1)?3:(header.version() == Header.MPEG25_LSF)?6:0); // SZD
if (channels == 2)
{
switch (which_channels)
{
case (int)OutputChannelsEnum.LEFT_CHANNEL:
case (int)OutputChannelsEnum.DOWNMIX_CHANNELS:
first_channel = last_channel = 0;
break;
case (int)OutputChannelsEnum.RIGHT_CHANNEL:
first_channel = last_channel = 1;
break;
case (int)OutputChannelsEnum.BOTH_CHANNELS:
default:
first_channel = 0;
last_channel = 1;
break;
}
}
else
{
first_channel = last_channel = 0;
}
for (int ch = 0; ch < 2; ch++)
for (int j = 0; j < 576; j++)
prevblck[ch][j] = 0.0f;
nonzero[0] = nonzero[1] = 576;
br = new BitReserve();
si = new III_side_info_t();
}
public virtual void decodedFrame(int frameNo, Header header, Obuffer o)
{
if (isDetail(MAX_DETAIL))
{
//UPGRADE_TODO: The equivalent in .NET for method 'java.Object.toString' may return a different value. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1043"'
System.String headerString = header.ToString();
pw.WriteLine("Decoded frame " + frameNo + ": " + headerString);
pw.WriteLine("Output: " + o);
}
else if (isDetail(VERBOSE_DETAIL))
{
if (frameNo == 0)
{
pw.Write("Converting.");
pw.Flush();
}
if ((frameNo % 10) == 0)
{
pw.Write('.');
pw.Flush();
}
}
}
/// <summary> Calculate 32 PCM samples and put the into the Obuffer-object.
/// </summary>
public void calculate_pcm_samples(Obuffer buffer)
{
compute_new_v();
compute_pcm_samples(buffer);
actual_write_pos = (actual_write_pos + 1) & 0xf;
actual_v = (actual_v == v1)?v2:v1;
// initialize samples[]:
//for (register float *floatp = samples + 32; floatp > samples; )
// *--floatp = 0.0f;
// MDM: this may not be necessary. The Layer III decoder always
// outputs 32 subband samples, but I haven't checked layer I & II.
for (int p = 0; p < 32; p++)
samples[p] = 0.0f;
}
private void compute_pcm_samples9(Obuffer buffer)
{
//UPGRADE_NOTE: Final was removed from the declaration of 'vp '. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1003"'
float[] vp = actual_v;
//int inc = v_inc;
//UPGRADE_NOTE: Final was removed from the declaration of 'tmpOut '. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1003"'
float[] tmpOut = _tmpOut;
int dvp = 0;
// fat chance of having this loop unroll
for (int i = 0; i < 32; i++)
{
//UPGRADE_NOTE: Final was removed from the declaration of 'dp '. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1003"'
float[] dp = d16[i];
float pcm_sample;
pcm_sample = (float) (((vp[9 + dvp] * dp[0]) + (vp[8 + dvp] * dp[1]) + (vp[7 + dvp] * dp[2]) + (vp[6 + dvp] * dp[3]) + (vp[5 + dvp] * dp[4]) + (vp[4 + dvp] * dp[5]) + (vp[3 + dvp] * dp[6]) + (vp[2 + dvp] * dp[7]) + (vp[1 + dvp] * dp[8]) + (vp[0 + dvp] * dp[9]) + (vp[15 + dvp] * dp[10]) + (vp[14 + dvp] * dp[11]) + (vp[13 + dvp] * dp[12]) + (vp[12 + dvp] * dp[13]) + (vp[11 + dvp] * dp[14]) + (vp[10 + dvp] * dp[15])) * scalefactor);
tmpOut[i] = pcm_sample;
dvp += 16;
}
// for
}
private void compute_pcm_samples(Obuffer buffer)
{
switch (actual_write_pos)
{
case 0:
compute_pcm_samples0(buffer);
break;
case 1:
compute_pcm_samples1(buffer);
break;
case 2:
compute_pcm_samples2(buffer);
break;
case 3:
compute_pcm_samples3(buffer);
break;
case 4:
compute_pcm_samples4(buffer);
break;
case 5:
compute_pcm_samples5(buffer);
break;
case 6:
compute_pcm_samples6(buffer);
break;
case 7:
compute_pcm_samples7(buffer);
break;
case 8:
compute_pcm_samples8(buffer);
break;
case 9:
compute_pcm_samples9(buffer);
break;
case 10:
compute_pcm_samples10(buffer);
break;
case 11:
compute_pcm_samples11(buffer);
break;
case 12:
compute_pcm_samples12(buffer);
break;
case 13:
compute_pcm_samples13(buffer);
break;
case 14:
compute_pcm_samples14(buffer);
break;
case 15:
compute_pcm_samples15(buffer);
break;
}
if (buffer != null)
{
buffer.appendSamples(channel, _tmpOut);
}
/*
// MDM: I was considering putting in quality control for
// low-spec CPUs, but the performance gain (about 10-15%)
// did not justify the considerable drop in audio quality.
switch (inc)
{
case 16:
buffer.appendSamples(channel, tmpOut);
break;
case 32:
for (int i=0; i<16; i++)
{
buffer.append(channel, (short)tmpOut[i]);
buffer.append(channel, (short)tmpOut[i]);
}
break;
case 64:
for (int i=0; i<8; i++)
{
buffer.append(channel, (short)tmpOut[i]);
buffer.append(channel, (short)tmpOut[i]);
buffer.append(channel, (short)tmpOut[i]);
buffer.append(channel, (short)tmpOut[i]);
}
break;
}*/
}
