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Expose QCELP's floating-point LSP-to-LPC function
qcelp_lsp exported a single function, ff_acelp_lspd2lpc, which was not specific to qcelp. It can be kept with its fixed-point version ff_acelp_lsp2lpc in lpc.c. Patch by Colin McQuillan ( m.niloc googlemail com ) Originally committed as revision 19571 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -177,7 +177,7 @@ OBJS-$(CONFIG_PNG_ENCODER) += png.o pngenc.o
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OBJS-$(CONFIG_PPM_DECODER) += pnmenc.o pnm.o
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OBJS-$(CONFIG_PPM_ENCODER) += pnmenc.o
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OBJS-$(CONFIG_PTX_DECODER) += ptx.o
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OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o qcelp_lsp.o celp_math.o celp_filters.o acelp_vectors.o
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OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o lsp.o celp_math.o celp_filters.o acelp_vectors.o
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OBJS-$(CONFIG_QDM2_DECODER) += qdm2.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
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OBJS-$(CONFIG_QDRAW_DECODER) += qdrw.o
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OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o
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@ -1,6 +1,7 @@
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/*
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* LSP routines for ACELP-based codecs
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*
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* Copyright (c) 2007 Reynaldo H. Verdejo Pinochet (QCELP decoder)
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* Copyright (c) 2008 Vladimir Voroshilov
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*
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* This file is part of FFmpeg.
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@ -118,3 +119,48 @@ void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd
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/* LSP values for second subframe (3.2.5 of G.729)*/
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ff_acelp_lsp2lpc(lp_2nd, lsp_2nd, lp_order >> 1);
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}
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/**
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* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
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* needed for LSP to LPC conversion.
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* We only need to calculate the 6 first elements of the polynomial.
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*
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* @param lsp line spectral pairs in cosine domain
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* @param f [out] polynomial input/output as a vector
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*
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* TIA/EIA/IS-733 2.4.3.3.5-1/2
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*/
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static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
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{
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int i, j;
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f[0] = 1.0;
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f[1] = -2 * lsp[0];
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lsp -= 2;
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for(i=2; i<=lp_half_order; i++)
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{
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double val = -2 * lsp[2*i];
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f[i] = val * f[i-1] + 2*f[i-2];
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for(j=i-1; j>1; j--)
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f[j] += f[j-1] * val + f[j-2];
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f[1] += val;
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}
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}
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void ff_acelp_lspd2lpc(const double *lsp, float *lpc)
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{
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double pa[6], qa[6];
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int i;
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lsp2polyf(lsp, pa, 5);
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lsp2polyf(lsp + 1, qa, 5);
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for (i=4; i>=0; i--)
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{
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double paf = pa[i+1] + pa[i];
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double qaf = qa[i+1] - qa[i];
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lpc[i ] = 0.5*(paf+qaf);
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lpc[9-i] = 0.5*(paf-qaf);
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}
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}
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@ -67,4 +67,14 @@ void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
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*/
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void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd, const int16_t* lsp_prev, int lp_order);
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/**
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* Reconstructs LPC coefficients from the line spectral pair frequencies.
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*
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* @param lsp line spectral pairs in cosine domain
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* @param lpc linear predictive coding coefficients
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*
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* TIA/EIA/IS-733 2.4.3.3.5
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*/
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void ff_acelp_lspd2lpc(const double *lsp, float *lpc);
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#endif /* AVCODEC_LSP_H */
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@ -1,81 +0,0 @@
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/*
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* QCELP decoder
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* Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavcodec/qcelp_lsp.c
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* QCELP decoder
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* @author Reynaldo H. Verdejo Pinochet
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* @remark FFmpeg merging spearheaded by Kenan Gillet
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* @remark Development mentored by Benjamin Larson
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*/
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#include "libavutil/mathematics.h"
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/**
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* Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
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* needed for LSP to LPC conversion.
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* We only need to calculate the 6 first elements of the polynomial.
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*
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* @param lsp line spectral pairs in cosine domain
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* @param f [out] polynomial input/output as a vector
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*
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* TIA/EIA/IS-733 2.4.3.3.5-1/2
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*/
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static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
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{
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int i, j;
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f[0] = 1.0;
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f[1] = -2 * lsp[0];
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lsp -= 2;
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for(i=2; i<=lp_half_order; i++)
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{
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double val = -2 * lsp[2*i];
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f[i] = val * f[i-1] + 2*f[i-2];
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for(j=i-1; j>1; j--)
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f[j] += f[j-1] * val + f[j-2];
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f[1] += val;
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}
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}
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/**
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* Reconstructs LPC coefficients from the line spectral pair frequencies.
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*
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* @param lsp line spectral pairs in cosine domain
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* @param lpc linear predictive coding coefficients
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*/
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void ff_acelp_lspd2lpc(const double *lsp, float *lpc)
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{
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double pa[6], qa[6];
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int i;
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lsp2polyf(lsp, pa, 5);
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lsp2polyf(lsp + 1, qa, 5);
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for (i=4; i>=0; i--)
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{
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double paf = pa[i+1] + pa[i];
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double qaf = qa[i+1] - qa[i];
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lpc[i ] = 0.5*(paf+qaf);
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lpc[9-i] = 0.5*(paf-qaf);
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}
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}
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@ -38,6 +38,7 @@
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#include "celp_math.h"
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#include "celp_filters.h"
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#include "acelp_vectors.h"
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#include "lsp.h"
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#undef NDEBUG
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#include <assert.h>
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@ -75,13 +76,6 @@ typedef struct
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uint8_t warned_buf_mismatch_bitrate;
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} QCELPContext;
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/**
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* Reconstructs LPC coefficients from the line spectral pair frequencies.
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*
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* TIA/EIA/IS-733 2.4.3.3.5
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*/
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void ff_acelp_lspd2lpc(const double *lsp, float *lpc);
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/**
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* Initialize the speech codec according to the specification.
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*
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