Package org.xiph.speex
Class NbDecoder
java.lang.Object
org.xiph.speex.NbCodec
org.xiph.speex.NbDecoder
Narrowband Speex Decoder
- Version:
- $Revision: 1.3 $
- Author:
- Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate int
protected boolean
protected Inband
private float[]
private float
Tail of the bufferprivate int
private float
Pitch of last correctly decoded frameprivate float[]
Pitch gain of last correctly decoded frameprivate int
Pitch gain of last decoded framesprotected Random
protected Stereo
Fields inherited from class org.xiph.speex.NbCodec
awk1, awk2, awk3, bufSize, dtx_enabled, exc_gain_quant_scal1, exc_gain_quant_scal3, excBuf, excIdx, filters, first, frameSize, frmBuf, frmIdx, gamma1, gamma2, innov, interp_qlpc, interp_qlsp, lag_factor, lpc, lpc_floor, lpcSize, m_lsp, max_pitch, mem_sp, min_pitch, NB_FRAME_SIZE, NB_SUBMODE_BITS, NB_SUBMODES, nbSubframes, old_qlsp, pi_gain, pre_mem, preemph, qlsp, subframeSize, submodeID, submodes, VERY_SMALL, voc_m1, voc_m2, voc_mean, voc_offset, windowSize
Fields inherited from interface org.xiph.speex.Codebook
cdbk_nb, cdbk_nb_high1, cdbk_nb_high2, cdbk_nb_low1, cdbk_nb_low2, exc_10_16_table, exc_10_32_table, exc_20_32_table, exc_5_256_table, exc_5_64_table, exc_8_128_table, gain_cdbk_lbr, gain_cdbk_nb, h0, h1, hexc_10_32_table, hexc_table, high_lsp_cdbk, high_lsp_cdbk2, NB_CDBK_SIZE, NB_CDBK_SIZE_HIGH1, NB_CDBK_SIZE_HIGH2, NB_CDBK_SIZE_LOW1, NB_CDBK_SIZE_LOW2
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionint
Decode the given input bits.int
decodeLost
(float[] out) Decode when packets are lost.void
decodeStereo
(float[] data, int frameSize) Decode the given bits to stereo.boolean
Returns whether perceptual enhancement is enabled or disabled.void
init
(int frameSize, int subframeSize, int lpcSize, int bufSize) Initialisevoid
setPerceptualEnhancement
(boolean enhanced) Enables or disables perceptual enhancement.Methods inherited from class org.xiph.speex.NbCodec
getDtx, getExc, getFrameSize, getInnov, getPiGain, nbinit
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Field Details
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innov2
private float[] innov2 -
count_lost
private int count_lost -
last_pitch
private int last_pitch -
last_pitch_gain
private float last_pitch_gainPitch of last correctly decoded frame -
pitch_gain_buf
private float[] pitch_gain_bufPitch gain of last correctly decoded frame -
pitch_gain_buf_idx
private int pitch_gain_buf_idxPitch gain of last decoded frames -
last_ol_gain
private float last_ol_gainTail of the buffer -
random
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stereo
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inband
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enhanced
protected boolean enhanced
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Constructor Details
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NbDecoder
public NbDecoder()Constructor
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Method Details
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init
public void init(int frameSize, int subframeSize, int lpcSize, int bufSize) Initialise -
decode
Decode the given input bits.- Specified by:
decode
in interfaceDecoder
- Parameters:
bits
- - Speex bits buffer.out
- - the decoded mono audio frame.- Returns:
- 1 if a terminator was found, 0 if not.
- Throws:
StreamCorruptedException
- If there is an error detected in the data stream.
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decodeLost
public int decodeLost(float[] out) Decode when packets are lost.- Parameters:
out
- - the generated mono audio frame.- Returns:
- 0 if successful.
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decodeStereo
public void decodeStereo(float[] data, int frameSize) Decode the given bits to stereo.- Specified by:
decodeStereo
in interfaceDecoder
- Parameters:
data
- - float array of size 2*frameSize, that contains the mono audio samples in the first half. When the function has completed, the array will contain the interlaced stereo audio samples.frameSize
- - the size of a frame of mono audio samples.
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setPerceptualEnhancement
public void setPerceptualEnhancement(boolean enhanced) Enables or disables perceptual enhancement.- Specified by:
setPerceptualEnhancement
in interfaceDecoder
- Parameters:
enhanced
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getPerceptualEnhancement
public boolean getPerceptualEnhancement()Returns whether perceptual enhancement is enabled or disabled.- Specified by:
getPerceptualEnhancement
in interfaceDecoder
- Returns:
- whether perceptual enhancement is enabled or disabled.
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