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 Player(System.IO.Stream stream, AudioDevice device)
{
bitstream = new Bitstream(stream);
decoder = new Decoder();
if (device != null)
{
audio = device;
}
else
{
FactoryRegistry r = FactoryRegistry.systemRegistry();
audio = r.createAudioDevice();
}
audio.open(decoder);
}
public abstract void read_allocation(Bitstream stream, Header header, Crc16 crc);
//UPGRADE_NOTE: Synchronized keyword was removed from method 'convert'. Lock expression was added. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1027"'
public virtual void convert(System.IO.Stream sourceStream, System.String destName, ProgressListener progressListener, Decoder.Params decoderParams)
{
lock (this)
{
if (progressListener == null)
progressListener = PrintWriterProgressListener.newStdOut(PrintWriterProgressListener.NO_DETAIL);
try
{
if (!(sourceStream is System.IO.BufferedStream))
sourceStream = new System.IO.BufferedStream(sourceStream);
int frameCount = - 1;
//UPGRADE_ISSUE: Method 'java.io.InputStream.markSupported' was not converted. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1000_javaioInputStreammarkSupported"'
if (sourceStream.markSupported())
{
//UPGRADE_ISSUE: Method 'java.io.InputStream.mark' was not converted. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1000_javaioInputStreammark_int"'
sourceStream.mark(- 1);
frameCount = countFrames(sourceStream);
//UPGRADE_ISSUE: Method 'java.io.InputStream.reset' was not converted. 'ms-help://MS.VSCC.2003/commoner/redir/redirect.htm?keyword="jlca1000_javaioInputStreamreset"'
sourceStream.reset();
}
progressListener.converterUpdate(javazoom.jl.converter.Converter.ProgressListener_Fields.UPDATE_FRAME_COUNT, frameCount, 0);
Obuffer output = null;
Decoder decoder = new Decoder(decoderParams);
Bitstream stream = new Bitstream(sourceStream);
if (frameCount == - 1)
frameCount = System.Int32.MaxValue;
int frame = 0;
long startTime = (System.DateTime.Now.Ticks - 621355968000000000) / 10000;
try
{
for (; frame < frameCount; frame++)
{
try
{
Header header = stream.readFrame();
if (header == null)
break;
progressListener.readFrame(frame, header);
if (output == null)
{
// REVIEW: Incorrect functionality.
// the decoder should provide decoded
// frequency and channels output as it may differ from
// the source (e.g. when downmixing stereo to mono.)
int channels = (header.mode() == Header.SINGLE_CHANNEL)?1:2;
int freq = header.frequency();
output = new WaveFileObuffer(channels, freq, destName);
decoder.OutputBuffer = output;
}
Obuffer decoderOutput = decoder.decodeFrame(header, stream);
// REVIEW: the way the output buffer is set
// on the decoder is a bit dodgy. Even though
// this exception should never happen, we test to be sure.
if (decoderOutput != output)
throw new System.ApplicationException("Output buffers are different.");
progressListener.decodedFrame(frame, header, output);
stream.closeFrame();
}
catch (System.Exception ex)
{
bool stop = !progressListener.converterException(ex);
if (stop)
{
throw new JavaLayerException(ex.Message, ex);
}
}
}
}
finally
{
if (output != null)
output.close();
}
int time = (int) ((System.DateTime.Now.Ticks - 621355968000000000) / 10000 - startTime);
progressListener.converterUpdate(javazoom.jl.converter.Converter.ProgressListener_Fields.UPDATE_CONVERT_COMPLETE, time, frame);
}
catch (System.IO.IOException ex)
{
throw new JavaLayerException(ex.Message, ex);
}
}
}
/// <summary> Read a 32-bit header from the bitstream.
/// </summary>
internal void read_header(Bitstream stream, Crc16[] crcp)
{
int headerstring;
int channel_bitrate;
bool sync = false;
do
{
headerstring = stream.syncHeader(syncmode);
_headerstring = headerstring; // E.B
if (syncmode == Bitstream.INITIAL_SYNC)
{
h_version = ((SupportClass.URShift(headerstring, 19)) & 1);
if (((SupportClass.URShift(headerstring, 20)) & 1) == 0)
// SZD: MPEG2.5 detection
if (h_version == MPEG2_LSF)
h_version = MPEG25_LSF;
else
throw stream.newBitstreamException(javazoom.jl.decoder.BitstreamErrors_Fields.UNKNOWN_ERROR);
if ((h_sample_frequency = ((SupportClass.URShift(headerstring, 10)) & 3)) == 3)
{
throw stream.newBitstreamException(javazoom.jl.decoder.BitstreamErrors_Fields.UNKNOWN_ERROR);
}
}
h_layer = 4 - (SupportClass.URShift(headerstring, 17)) & 3;
h_protection_bit = (SupportClass.URShift(headerstring, 16)) & 1;
h_bitrate_index = (SupportClass.URShift(headerstring, 12)) & 0xF;
h_padding_bit = (SupportClass.URShift(headerstring, 9)) & 1;
h_mode = ((SupportClass.URShift(headerstring, 6)) & 3);
h_mode_extension = (SupportClass.URShift(headerstring, 4)) & 3;
if (h_mode == JOINT_STEREO)
h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
else
h_intensity_stereo_bound = 0;
// should never be used
if (((SupportClass.URShift(headerstring, 3)) & 1) == 1)
h_copyright = true;
if (((SupportClass.URShift(headerstring, 2)) & 1) == 1)
h_original = true;
// calculate number of subbands:
if (h_layer == 1)
h_number_of_subbands = 32;
else
{
channel_bitrate = h_bitrate_index;
// calculate bitrate per channel:
if (h_mode != SINGLE_CHANNEL)
if (channel_bitrate == 4)
channel_bitrate = 1;
else
channel_bitrate -= 4;
if ((channel_bitrate == 1) || (channel_bitrate == 2))
if (h_sample_frequency == THIRTYTWO)
h_number_of_subbands = 12;
else
h_number_of_subbands = 8;
else if ((h_sample_frequency == FOURTYEIGHT) || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
h_number_of_subbands = 27;
else
h_number_of_subbands = 30;
}
if (h_intensity_stereo_bound > h_number_of_subbands)
h_intensity_stereo_bound = h_number_of_subbands;
// calculate framesize and nSlots
calculate_framesize();
// read framedata:
stream.read_frame_data(framesize);
if (stream.isSyncCurrentPosition(syncmode))
{
if (syncmode == Bitstream.INITIAL_SYNC)
{
syncmode = Bitstream.STRICT_SYNC;
stream.set_syncword(headerstring & unchecked((int)0xFFF80CC0));
}
sync = true;
}
else
{
stream.unreadFrame();
}
}
while (!sync);
stream.parse_frame();
if (h_protection_bit == 0)
{
// frame contains a crc checksum
checksum = (short) stream.get_bits(16);
if (crc == null)
crc = new Crc16();
crc.add_bits(headerstring, 16);
crcp[0] = crc;
}
else
crcp[0] = null;
if (h_sample_frequency == FOURTYFOUR_POINT_ONE)
{
/*
if (offset == null)
{
int max = max_number_of_frames(stream);
offset = new int[max];
for(int i=0; i<max; i++) offset[i] = 0;
}
// Bizarre, y avait ici une acollade ouvrante
int cf = stream.current_frame();
int lf = stream.last_frame();
if ((cf > 0) && (cf == lf))
{
offset[cf] = offset[cf-1] + h_padding_bit;
}
else
{
offset[0] = h_padding_bit;
}
*/
}
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
allocation = stream.get_bits(4);
channel2_allocation = stream.get_bits(4);
// try/catch block to handle invalid allocation
// (catch array bounds error)
try
{
if (crc != null)
{
crc.add_bits(allocation, 4);
crc.add_bits(channel2_allocation, 4);
}
if (allocation != 0)
{
samplelength = allocation + 1;
factor = table_factor[allocation];
offset = table_offset[allocation];
}
if (channel2_allocation != 0)
{
channel2_samplelength = channel2_allocation + 1;
channel2_factor = table_factor[channel2_allocation];
channel2_offset = table_offset[channel2_allocation];
}
}
catch (IndexOutOfRangeException )
{
// array bounds error? Invalid allocation
// (or unsupported). Ignore for now.
}
}
/// <summary>*
/// </summary>
public override void read_scalefactor(Bitstream stream, Header header)
{
if (allocation != 0)
scalefactor = scalefactors[stream.get_bits(6)];
if (channel2_allocation != 0)
channel2_scalefactor = scalefactors[stream.get_bits(6)];
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
if ((allocation = stream.get_bits(4)) == 15)
{
}
// cerr << "WARNING: stream contains an illegal allocation!\n";
// MPEG-stream is corrupted!
if (crc != null)
crc.add_bits(allocation, 4);
if (allocation != 0)
{
samplelength = allocation + 1;
factor = table_factor[allocation];
offset = table_offset[allocation];
}
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
base.read_allocation(stream, header, crc);
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
if (allocation != 0)
if (groupingtable[0] != null)
{
int samplecode = stream.get_bits(codelength[0]);
// create requantized samples:
samplecode += samplecode << 1;
float[] target = samples;
float[] source = groupingtable[0];
/*
int tmp = 0;
int temp = 0;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp] = source[samplecode + temp];
*/
//Bugfix:
int tmp = 0;
int temp = samplecode;
if (temp > source.Length - 3)
temp = source.Length - 3;
target[tmp] = source[temp];
temp++; tmp++;
target[tmp] = source[temp];
temp++; tmp++;
target[tmp] = source[temp];
// memcpy (samples, groupingtable + samplecode, 3 * sizeof (real));
}
else
{
samples[0] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
samples[1] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
samples[2] = (float) ((stream.get_bits(codelength[0])) * factor[0] - 1.0);
}
samplenumber = 0;
if (++groupnumber == 12)
return true;
else
return false;
}
/// <summary>*
/// </summary>
public override void read_scalefactor(Bitstream stream, Header header)
{
if (allocation != 0)
{
switch (scfsi)
{
case 0:
scalefactor1 = scalefactors[stream.get_bits(6)];
scalefactor2 = scalefactors[stream.get_bits(6)];
scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
scalefactor1 = scalefactor2 = scalefactors[stream.get_bits(6)];
scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
scalefactor1 = scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
scalefactor1 = scalefactors[stream.get_bits(6)];
scalefactor2 = scalefactor3 = scalefactors[stream.get_bits(6)];
break;
}
prepare_sample_reading(header, allocation, 0, factor, codelength, c, d);
}
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
base.read_allocation(stream, header, crc);
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
return(base.read_sampledata(stream));
}
public abstract bool read_sampledata(Bitstream stream);
public abstract void read_scalefactor(Bitstream stream, Header header);
public abstract void read_allocation(Bitstream stream, Header header, Crc16 crc);
public abstract bool read_sampledata(Bitstream stream);
/// <summary>*
/// </summary>
public virtual void read_scalefactor_selection(Bitstream stream, Crc16 crc)
{
if (allocation != 0)
{
scfsi = stream.get_bits(2);
if (crc != null)
crc.add_bits(scfsi, 2);
}
}
public abstract void read_scalefactor(Bitstream stream, Header header);
/// <summary>*
/// </summary>
public override void read_scalefactor(Bitstream stream, Header header)
{
if (allocation != 0)
{
base.read_scalefactor(stream, header);
switch (channel2_scfsi)
{
case 0:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
channel2_scalefactor1 = channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
}
}
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
if (allocation != 0)
{
sample = (float) (stream.get_bits(samplelength));
}
if (++samplenumber == 12)
{
samplenumber = 0;
return true;
}
return false;
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
int length = get_allocationlength(header);
allocation = stream.get_bits(length);
channel2_allocation = stream.get_bits(length);
if (crc != null)
{
crc.add_bits(allocation, length);
crc.add_bits(channel2_allocation, length);
}
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
return base.read_sampledata(stream);
}
/// <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();
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
bool returnvalue = base.read_sampledata(stream);
if (channel2_allocation != 0)
{
channel2_sample = (float) (stream.get_bits(channel2_samplelength));
}
return (returnvalue);
}
protected internal virtual FrameDecoder retrieveDecoder(Header header, Bitstream stream, int layer)
{
FrameDecoder decoder = null;
// REVIEW: allow channel output selection type
// (LEFT, RIGHT, BOTH, DOWNMIX)
switch (layer)
{
case 3:
if (l3decoder == null)
{
l3decoder = new LayerIIIDecoder(stream, header, filter1, filter2, output, (int)OutputChannelsEnum.BOTH_CHANNELS);
}
decoder = l3decoder;
break;
case 2:
if (l2decoder == null)
{
l2decoder = new LayerIIDecoder();
l2decoder.create(stream, header, filter1, filter2, output, (int)OutputChannelsEnum.BOTH_CHANNELS);
}
decoder = l2decoder;
break;
case 1:
if (l1decoder == null)
{
l1decoder = new LayerIDecoder();
l1decoder.create(stream, header, filter1, filter2, output, (int)OutputChannelsEnum.BOTH_CHANNELS);
}
decoder = l1decoder;
break;
}
if (decoder == null)
{
throw newDecoderException(javazoom.jl.decoder.DecoderErrors_Fields.UNSUPPORTED_LAYER, null);
}
return decoder;
}
/// <summary>*
/// </summary>
public override bool read_sampledata(Bitstream stream)
{
bool returnvalue = base.read_sampledata(stream);
if (channel2_allocation != 0)
if (groupingtable[1] != null)
{
int samplecode = stream.get_bits(channel2_codelength[0]);
// create requantized samples:
samplecode += samplecode << 1;
/*
float[] target = channel2_samples;
float[] source = channel2_groupingtable[0];
int tmp = 0;
int temp = 0;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp++] = source[samplecode + temp];
temp++;
target[tmp] = source[samplecode + temp];
// memcpy (channel2_samples, channel2_groupingtable + samplecode, 3 * sizeof (real));
*/
float[] target = channel2_samples;
float[] source = groupingtable[1];
int tmp = 0;
int temp = samplecode;
target[tmp] = source[temp];
temp++; tmp++;
target[tmp] = source[temp];
temp++; tmp++;
target[tmp] = source[temp];
}
else
{
channel2_samples[0] = (float) ((stream.get_bits(channel2_codelength[0])) * channel2_factor[0] - 1.0);
channel2_samples[1] = (float) ((stream.get_bits(channel2_codelength[0])) * channel2_factor[0] - 1.0);
channel2_samples[2] = (float) ((stream.get_bits(channel2_codelength[0])) * channel2_factor[0] - 1.0);
}
return returnvalue;
}
/// <summary> Read a 32-bit header from the bitstream.
/// </summary>
internal void read_header(Bitstream stream, Crc16[] crcp)
{
int headerstring;
int channel_bitrate;
bool sync = false;
do
{
headerstring = stream.syncHeader(syncmode);
_headerstring = headerstring; // E.B
if (syncmode == Bitstream.INITIAL_SYNC)
{
h_version = ((SupportClass.URShift(headerstring, 19)) & 1);
if (((SupportClass.URShift(headerstring, 20)) & 1) == 0)
{
// SZD: MPEG2.5 detection
if (h_version == MPEG2_LSF)
{
h_version = MPEG25_LSF;
}
else
{
throw stream.newBitstreamException(javazoom.jl.decoder.BitstreamErrors_Fields.UNKNOWN_ERROR);
}
}
if ((h_sample_frequency = ((SupportClass.URShift(headerstring, 10)) & 3)) == 3)
{
throw stream.newBitstreamException(javazoom.jl.decoder.BitstreamErrors_Fields.UNKNOWN_ERROR);
}
}
h_layer = 4 - (SupportClass.URShift(headerstring, 17)) & 3;
h_protection_bit = (SupportClass.URShift(headerstring, 16)) & 1;
h_bitrate_index = (SupportClass.URShift(headerstring, 12)) & 0xF;
h_padding_bit = (SupportClass.URShift(headerstring, 9)) & 1;
h_mode = ((SupportClass.URShift(headerstring, 6)) & 3);
h_mode_extension = (SupportClass.URShift(headerstring, 4)) & 3;
if (h_mode == JOINT_STEREO)
{
h_intensity_stereo_bound = (h_mode_extension << 2) + 4;
}
else
{
h_intensity_stereo_bound = 0;
}
// should never be used
if (((SupportClass.URShift(headerstring, 3)) & 1) == 1)
{
h_copyright = true;
}
if (((SupportClass.URShift(headerstring, 2)) & 1) == 1)
{
h_original = true;
}
// calculate number of subbands:
if (h_layer == 1)
{
h_number_of_subbands = 32;
}
else
{
channel_bitrate = h_bitrate_index;
// calculate bitrate per channel:
if (h_mode != SINGLE_CHANNEL)
{
if (channel_bitrate == 4)
{
channel_bitrate = 1;
}
else
{
channel_bitrate -= 4;
}
}
if ((channel_bitrate == 1) || (channel_bitrate == 2))
{
if (h_sample_frequency == THIRTYTWO)
{
h_number_of_subbands = 12;
}
else
{
h_number_of_subbands = 8;
}
}
else if ((h_sample_frequency == FOURTYEIGHT) || ((channel_bitrate >= 3) && (channel_bitrate <= 5)))
{
h_number_of_subbands = 27;
}
else
{
h_number_of_subbands = 30;
}
}
if (h_intensity_stereo_bound > h_number_of_subbands)
{
h_intensity_stereo_bound = h_number_of_subbands;
}
// calculate framesize and nSlots
calculate_framesize();
// read framedata:
stream.read_frame_data(framesize);
if (stream.isSyncCurrentPosition(syncmode))
{
if (syncmode == Bitstream.INITIAL_SYNC)
{
syncmode = Bitstream.STRICT_SYNC;
stream.set_syncword(headerstring & unchecked ((int)0xFFF80CC0));
}
sync = true;
}
else
{
stream.unreadFrame();
}
}while (!sync);
stream.parse_frame();
if (h_protection_bit == 0)
{
// frame contains a crc checksum
checksum = (short)stream.get_bits(16);
if (crc == null)
{
crc = new Crc16();
}
crc.add_bits(headerstring, 16);
crcp[0] = crc;
}
else
{
crcp[0] = null;
}
if (h_sample_frequency == FOURTYFOUR_POINT_ONE)
{
/*
* if (offset == null)
* {
* int max = max_number_of_frames(stream);
* offset = new int[max];
* for(int i=0; i<max; i++) offset[i] = 0;
* }
* // Bizarre, y avait ici une acollade ouvrante
* int cf = stream.current_frame();
* int lf = stream.last_frame();
* if ((cf > 0) && (cf == lf))
* {
* offset[cf] = offset[cf-1] + h_padding_bit;
* }
* else
* {
* offset[0] = h_padding_bit;
* }
*/
}
}
/// <summary> Decodes one frame from an MPEG audio bitstream.
///
/// </summary>
/// <param name="header The">header describing the frame to decode.
/// </param>
/// <param name="bitstream The">bistream that provides the bits for te body of the frame.
///
/// </param>
/// <returns> A SampleBuffer containing the decoded samples.
///
/// </returns>
public virtual Obuffer decodeFrame(Header header, Bitstream stream)
{
if (!initialized)
{
initialize(header);
}
int layer = header.layer();
output.clear_buffer();
FrameDecoder decoder = retrieveDecoder(header, stream, layer);
decoder.decodeFrame();
output.write_buffer(1);
return output;
}
/// <summary>*
/// </summary>
public override void read_scalefactor(Bitstream stream, Header header)
{
base.read_scalefactor(stream, header);
if (channel2_allocation != 0)
{
switch (channel2_scfsi)
{
case 0:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 1:
channel2_scalefactor1 = channel2_scalefactor2 = scalefactors[stream.get_bits(6)];
channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 2:
channel2_scalefactor1 = channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
case 3:
channel2_scalefactor1 = scalefactors[stream.get_bits(6)];
channel2_scalefactor2 = channel2_scalefactor3 = scalefactors[stream.get_bits(6)];
break;
}
prepare_sample_reading(header, channel2_allocation, 1, channel2_factor, channel2_codelength, channel2_c, channel2_d);
}
}
/// <summary>*
/// </summary>
public override void read_scalefactor_selection(Bitstream stream, Crc16 crc)
{
if (allocation != 0)
{
scfsi = stream.get_bits(2);
if (crc != null)
crc.add_bits(scfsi, 2);
}
if (channel2_allocation != 0)
{
channel2_scfsi = stream.get_bits(2);
if (crc != null)
crc.add_bits(channel2_scfsi, 2);
}
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
allocation = stream.get_bits(4);
channel2_allocation = stream.get_bits(4);
if (crc != null)
{
crc.add_bits(allocation, 4);
crc.add_bits(channel2_allocation, 4);
}
if (allocation != 0)
{
samplelength = allocation + 1;
factor = table_factor[allocation];
offset = table_offset[allocation];
}
if (channel2_allocation != 0)
{
channel2_samplelength = channel2_allocation + 1;
channel2_factor = table_factor[channel2_allocation];
channel2_offset = table_offset[channel2_allocation];
}
}
