/// <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)
{
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];
}
}
/// <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_allocation(Bitstream stream, Header header, Crc16 crc)
{
base.read_allocation(stream, header, crc);
}
/// <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];
}
}
public abstract void read_allocation(Bitstream stream, Header header, Crc16 crc);
/// <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)
{
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> 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;
}
*/
}
}
// new Crc16[1] to enable CRC checking.
public LayerIDecoder()
{
crc = new Crc16();
}
/// <summary>*
/// </summary>
public override void read_allocation(Bitstream stream, Header header, Crc16 crc)
{
base.read_allocation(stream, header, crc);
}
public abstract void read_allocation(Bitstream stream, Header header, Crc16 crc);
/// <summary> Process user arguments.
/// *
/// Returns true if successful.
/// </summary>
public virtual bool processArgs(System.String[] argv)
{
filename = null;
Crc16[] crc;
crc = new Crc16[1];
int i;
int argc = argv.Length;
//stdout_mode = false;
verbose_mode = false;
output_mode = OutputChannels.BOTH_CHANNELS;
output_filename = "";
if (argc < 2 || argv[1].Equals("-h"))
return Usage();
i = 1;
while (i < argc)
{
/* System.out.println("Option = "+argv[i]);*/
if (argv[i][0] == '-')
{
if (argv[i].StartsWith("-v"))
{
verbose_mode = true;
if (argv[i].Length > 2)
{
try
{
System.String level = argv[i].Substring(2);
verbose_level = System.Int32.Parse(level);
}
catch (System.FormatException ex)
{
System.Console.Error.WriteLine("Invalid verbose level. Using default.");
}
}
System.Console.Out.WriteLine("Verbose Activated (level " + verbose_level + ")");
}
/* else if (argv[i].equals("-s"))
ma.stdout_mode = true; */
else if (argv[i].Equals("-p"))
{
if (++i == argc)
{
System.Console.Out.WriteLine("Please specify an output filename after the -p option!");
System.Environment.Exit(1);
}
//output_mode = O_WAVEFILE;
output_filename = argv[i];
}
/*else if (argv[i].equals("-f"))
{
if (++i == argc)
{
System.out.println("Please specify a new scalefactor after the -f option!");
System.exit(1);
}
ma.use_own_scalefactor = true;
// ma.scalefactor = argv[i];
}*/
else
return Usage();
}
else
{
filename = argv[i];
System.Console.Out.WriteLine("FileName = " + argv[i]);
if (filename == null)
return Usage();
}
i++;
}
if (filename == null)
return Usage();
return true;
}
// new Crc16[1] to enable CRC checking.
public LayerIDecoder()
{
crc = new Crc16();
}
/// <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);
}
}
/// <summary> Read a 32-bit header from the bitstream.
/// </summary>
public void read_header(Bitstream stream, Crc16[] crcp)
{
int headerstring;
int channel_bitrate;
bool sync = false;
////System.Diagnostics.Trace.WriteLine("Header - read_header");
do
{
////System.Diagnostics.Trace.WriteLine("Header - read_header - syncHeader");
headerstring = stream.syncHeader(syncmode);
_headerstring = headerstring; // E.B
////System.Diagnostics.Trace.WriteLine("Header - sync");
if (syncmode == Bitstream.INITIAL_SYNC)
{
////System.Diagnostics.Trace.WriteLine("Header - read_header - bit shifting");
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);
}
}
////System.Diagnostics.Trace.WriteLine("Header - read_header - more bit shifting");
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;
}
////System.Diagnostics.Trace.WriteLine("Header - read_header - calculate subbands");
// calculate number of subbands:
if (h_layer == 1)
{
h_number_of_subbands = 32;
}
else
{
////System.Diagnostics.Trace.WriteLine("Header - read_header - manage bitrates");
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
////System.Diagnostics.Trace.WriteLine("Header - read_header - calculate framesize");
calculate_framesize();
////System.Diagnostics.Trace.WriteLine("Header - read_header - calculate read frame data");
// 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);
////System.Diagnostics.Trace.WriteLine("Header - read_header - syncing:" +sync.ToString());
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)
{
/*//HACKED
* 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;
* }*/
}
////System.Diagnostics.Trace.WriteLine("Header - read_header end");
}
/// <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];
}
}
