61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/**
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*
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* $Log: private.h,v $
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* Revision 1.4 2002/11/20 04:29:13 robertj
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* Included optimisations for G.711 and G.726 codecs, thanks Ted Szoczei
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*
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* Revision 1.1 2002/02/11 23:24:23 robertj
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* Updated to openH323 v1.8.0
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*
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* Revision 1.2 2002/02/10 21:14:54 dereks
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* Add cvs log history to head of the file.
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* Ensure file is terminated by a newline.
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*
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*
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*
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*/
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#if !defined G726_PRIVATE
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#define G726_PRIVATE
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int linear2ulaw(int pcm_val);
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int ulaw2linear(int u_val);
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int linear2alaw(int pcm_val);
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int alaw2linear(int u_val);
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static int fmult(int an, int srn);
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int predictor_zero( g726_state *state_ptr);
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int predictor_pole( g726_state *state_ptr);
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int step_size( g726_state *state_ptr);
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int quantize( int d, /* Raw difference signal sample */
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int y, /* Step size multiplier */
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int * table, /* quantization table */
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int size); /* table size of short integers */
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int reconstruct( int sign, /* 0 for non-negative value */
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int dqln, /* G.72x codeword */
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int y); /* Step size multiplier */
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void update( int code_size, /* distinguish 723_40 with others */
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int y, /* quantizer step size */
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int wi, /* scale factor multiplier */
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int fi, /* for long/short term energies */
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int dq, /* quantized prediction difference */
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int sr, /* reconstructed signal */
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int dqsez, /* difference from 2-pole predictor */
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g726_state *state_ptr); /* coder state pointer */
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int tandem_adjust_alaw(
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int sr, /* decoder output linear PCM sample */
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int se, /* predictor estimate sample */
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int y, /* quantizer step size */
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int i, /* decoder input code */
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int sign,
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int * qtab);
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int tandem_adjust_ulaw(
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int sr, /* decoder output linear PCM sample */
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int se, /* predictor estimate sample */
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int y, /* quantizer step size */
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int i, /* decoder input code */
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int sign,
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int * qtab);
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#endif // G726_PRIVATE
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