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rework LPC coefficient quantizer

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This commit is contained in:
Josh Coalson
2001-02-28 23:56:03 +00:00
parent 74ce843cb7
commit c625f9033c
2 changed files with 69 additions and 13 deletions
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14
src/libFLAC/include/private/lpc.h
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@@ -71,15 +71,15 @@ void FLAC__lpc_compute_lp_coefficients(const real autoc[], unsigned max_order, r
* bit) of largest coefficient
* IN bits_per_sample > 0 bits per sample of the originial signal
* OUT qlp_coeff[0,order-1] quantized coefficients
* OUT bits # of bits to shift right to get approximated
* LP coefficients. NOTE: could be negative,
* but |*bits| will always be <= precision
* OUT shift # of bits to shift right to get approximated
* LP coefficients. NOTE: could be negative.
* RETURN 0 => quantization OK
* 1 => coefficients vary too much to quantize to the desired
* precision. 'bits' is unset
* 2 => coefficients are all zero, which is bad. 'bits' is unset
* 1 => coefficients require too much shifting for *shift to
* fit in the LPC subframe header. 'shift' is unset.
* 2 => coefficients are all zero, which is bad. 'shift' is
* unset.
*/
int FLAC__lpc_quantize_coefficients(const real lp_coeff[], unsigned order, unsigned precision, unsigned bits_per_sample, int32 qlp_coeff[], int *bits);
int FLAC__lpc_quantize_coefficients(const real lp_coeff[], unsigned order, unsigned precision, unsigned bits_per_sample, int32 qlp_coeff[], int *shift);
/*
* FLAC__lpc_compute_residual_from_qlp_coefficients()