/// <summary>
/// Creates a new stream instance using the provided stream as a source.
/// Will also read the first frame of the MP3 into the internal buffer.
/// TODO: allow selecting stereo or mono in the constructor (note that this also requires "implementing" the stereo format).
/// UPDATE: (Giperion) I hate that TODO above
/// </summary>
public MP3Stream(Stream sourceStream, int chunkSize, bool IsMono)
{
IsEOF = false;
m_SourceStream = sourceStream;
pushback = new PushbackStream(m_SourceStream, chunkSize);
m_BitStream = new Bitstream(pushback);
if (IsMono)
{
Decoder.Params ParamsCustom = new Decoder.Params();
ParamsCustom.OutputChannels = OutputChannels.LEFT;
m_Decoder = new Decoder(ParamsCustom);
m_Buffer = new Buffer16BitMono();
FormatRep = SoundFormat.Pcm16BitMono;
m_ChannelCountRep = 1;
}
else
{
m_Buffer = new Buffer16BitStereo();
FormatRep = SoundFormat.Pcm16BitStereo;
m_ChannelCountRep = 2;
}
m_Decoder.OutputBuffer = m_Buffer;
// read the first frame. This will fill the initial buffer with data, and get our frequency!
if (!ReadFrame())
{
IsEOF = true;
}
}
private static void test_xbuffer(A data)
{
var steam = new XSteam(1, 1024 * 1024 * 100);
// 序列化
uint offset = 0;
Timer.beginTime();
ABuffer.serialize(data, steam);
Timer.endTime("xbuffer 普通模式序列化");
var buffer = steam.getBytes();
// 反序列化
offset = 0;
Timer.beginTime();
ABuffer.deserialize(buffer, ref offset);
Timer.endTime("xbuffer 普通模式反序列化");
// 泛型模式序列化
Timer.beginTime();
Serializer.cachedSteam = steam;
Serializer.serialize(data);
Timer.endTime("xbuffer 泛型模式序列化");
buffer = steam.getBytes();
// 泛型模式反序列化
Timer.beginTime();
Serializer.deserialize <A>(buffer);
Timer.endTime("xbuffer 泛型模式反序列化");
// 内存占用
Console.WriteLine(string.Format(" xbuffer 普通模式总占用内存 {0} byte.", buffer.Length));
}
public virtual void Create(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb,
ABuffer buffer0, int whichCh0)
{
stream = stream0;
header = header0;
filter1 = filtera;
filter2 = filterb;
buffer = buffer0;
which_channels = whichCh0;
}
public virtual void Create(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb,
ABuffer buffer0, int whichCh0)
{
stream = stream0;
header = header0;
filter1 = filtera;
filter2 = filterb;
buffer = buffer0;
which_channels = whichCh0;
}
internal virtual void Create(Bitstream stream0, Header header0, SynthesisFilter filtera, SynthesisFilter filterb,
ABuffer buffer0, int whichCh0)
{
Stream = stream0;
Header = header0;
Filter1 = filtera;
Filter2 = filterb;
Buffer = buffer0;
WhichChannels = whichCh0;
}
/// <summary>
/// Reads a frame from the MP3 stream. Returns whether the operation was successful. If it wasn't,
/// the source stream is probably at its end.
/// </summary>
private bool ReadFrame(bool first = false)
{
// Read a frame from the bitstream.
Header header = m_BitStream.readFrame();
if (header == null)
{
return(false);
}
try
{
// Set the channel count and frequency values for the stream.
if (header.mode() == Header.SINGLE_CHANNEL)
{
m_ChannelCountRep = 1;
}
else
{
m_ChannelCountRep = 2;
}
m_FrequencyRep = header.frequency();
// if (first)
// m_TotalMs = header.total_ms((int) m_SourceStream.Length);
// Decode the frame.
ABuffer decoderOutput = m_Decoder.DecodeFrame(header, m_BitStream);
// Apparently, the way JavaZoom sets the output buffer
// on the decoder is a bit dodgy. Even though
// this exception should never happen, we test to be sure.
if (decoderOutput != m_Buffer)
{
throw new ApplicationException("Output buffers are different.");
}
// And we're done.
}
finally
{
// No resource leaks please!
m_BitStream.CloseFrame();
}
return(true);
}
/// <summary>
/// Constructor.
/// REVIEW: these constructor arguments should be moved to the decodeFrame() method.
/// </summary>
public LayerIIIDecoder(Bitstream stream, Header header, SynthesisFilter filtera, SynthesisFilter filterb, ABuffer buffer, int whichCh)
{
Huffman.Initialize();
InitBlock();
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 ScaleFactorData[2];
III_scalefac_t[0] = new ScaleFactorData();
III_scalefac_t[1] = new ScaleFactorData();
scalefac = III_scalefac_t;
// L3TABLE INIT
sfBandIndex = new SBI[9]; // SZD: MPEG2.5 +3 indices
int[] l0 =
{
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 = {0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192};
int[] l1 =
{
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 = {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192};
int[] l2 =
{
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 = {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l3 =
{
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 = {0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192};
int[] l4 =
{
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 = {0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192};
int[] l5 =
{
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 = {0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192};
// SZD: MPEG2.5
int[] l6 =
{
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 = {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l7 =
{
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 = {0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192};
int[] l8 =
{
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 = {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 = {0, 6, 11, 16, 21};
int[] ss0 = {0, 6, 12};
sftable = new ScaleFactorTable(this, ll0, ss0);
// END OF Sftable
// scalefac_buffer
scalefac_buffer = new int[54];
// END OF scalefac_buffer
this.stream = stream;
this.header = header;
filter1 = filtera;
filter2 = filterb;
this.buffer = buffer;
which_channels = whichCh;
frame_start = 0;
channels = (this.header.mode() == Header.SINGLE_CHANNEL) ? 1 : 2;
max_gr = (this.header.version() == Header.MPEG1) ? 2 : 1;
sfreq = this.header.sample_frequency() +
((this.header.version() == Header.MPEG1) ? 3 : (this.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;
m_BitReserve = new BitReserve();
m_SideInfo = new Layer3SideInfo();
}
