[SCM] libav/experimental: 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.
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:49:41 UTC 2013
The following commit has been merged in the experimental branch:
commit 33ae681f5ca9fa9aae82081dd6a6edbe2509f983
Author: Colin McQuillan <m.niloc at googlemail.com>
Date: Mon Aug 3 08:37:02 2009 +0000
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
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index c549d20..3ad54c0 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -177,7 +177,7 @@ OBJS-$(CONFIG_PNG_ENCODER) += png.o pngenc.o
OBJS-$(CONFIG_PPM_DECODER) += pnmenc.o pnm.o
OBJS-$(CONFIG_PPM_ENCODER) += pnmenc.o
OBJS-$(CONFIG_PTX_DECODER) += ptx.o
-OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o qcelp_lsp.o celp_math.o celp_filters.o acelp_vectors.o
+OBJS-$(CONFIG_QCELP_DECODER) += qcelpdec.o lsp.o celp_math.o celp_filters.o acelp_vectors.o
OBJS-$(CONFIG_QDM2_DECODER) += qdm2.o mpegaudiodec.o mpegaudiodecheader.o mpegaudio.o mpegaudiodata.o
OBJS-$(CONFIG_QDRAW_DECODER) += qdrw.o
OBJS-$(CONFIG_QPEG_DECODER) += qpeg.o
diff --git a/libavcodec/lsp.c b/libavcodec/lsp.c
index f57f621..5b5fc1c 100644
--- a/libavcodec/lsp.c
+++ b/libavcodec/lsp.c
@@ -1,6 +1,7 @@
/*
* LSP routines for ACELP-based codecs
*
+ * Copyright (c) 2007 Reynaldo H. Verdejo Pinochet (QCELP decoder)
* Copyright (c) 2008 Vladimir Voroshilov
*
* This file is part of FFmpeg.
@@ -118,3 +119,48 @@ void ff_acelp_lp_decode(int16_t* lp_1st, int16_t* lp_2nd, const int16_t* lsp_2nd
/* LSP values for second subframe (3.2.5 of G.729)*/
ff_acelp_lsp2lpc(lp_2nd, lsp_2nd, lp_order >> 1);
}
+
+/**
+ * Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
+ * needed for LSP to LPC conversion.
+ * We only need to calculate the 6 first elements of the polynomial.
+ *
+ * @param lsp line spectral pairs in cosine domain
+ * @param f [out] polynomial input/output as a vector
+ *
+ * TIA/EIA/IS-733 2.4.3.3.5-1/2
+ */
+static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
+{
+ int i, j;
+
+ f[0] = 1.0;
+ f[1] = -2 * lsp[0];
+ lsp -= 2;
+ for(i=2; i<=lp_half_order; i++)
+ {
+ double val = -2 * lsp[2*i];
+ f[i] = val * f[i-1] + 2*f[i-2];
+ for(j=i-1; j>1; j--)
+ f[j] += f[j-1] * val + f[j-2];
+ f[1] += val;
+ }
+}
+
+void ff_acelp_lspd2lpc(const double *lsp, float *lpc)
+{
+ double pa[6], qa[6];
+ int i;
+
+ lsp2polyf(lsp, pa, 5);
+ lsp2polyf(lsp + 1, qa, 5);
+
+ for (i=4; i>=0; i--)
+ {
+ double paf = pa[i+1] + pa[i];
+ double qaf = qa[i+1] - qa[i];
+
+ lpc[i ] = 0.5*(paf+qaf);
+ lpc[9-i] = 0.5*(paf-qaf);
+ }
+}
diff --git a/libavcodec/lsp.h b/libavcodec/lsp.h
index 2337756..0fa5850 100644
--- a/libavcodec/lsp.h
+++ b/libavcodec/lsp.h
@@ -67,4 +67,14 @@ void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
*/
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);
+/**
+ * Reconstructs LPC coefficients from the line spectral pair frequencies.
+ *
+ * @param lsp line spectral pairs in cosine domain
+ * @param lpc linear predictive coding coefficients
+ *
+ * TIA/EIA/IS-733 2.4.3.3.5
+ */
+void ff_acelp_lspd2lpc(const double *lsp, float *lpc);
+
#endif /* AVCODEC_LSP_H */
diff --git a/libavcodec/qcelp_lsp.c b/libavcodec/qcelp_lsp.c
deleted file mode 100644
index 6823ad8..0000000
--- a/libavcodec/qcelp_lsp.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/*
- * QCELP decoder
- * Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file libavcodec/qcelp_lsp.c
- * QCELP decoder
- * @author Reynaldo H. Verdejo Pinochet
- * @remark FFmpeg merging spearheaded by Kenan Gillet
- * @remark Development mentored by Benjamin Larson
- */
-
-#include "libavutil/mathematics.h"
-
-/**
- * Computes the Pa / (1 + z(-1)) or Qa / (1 - z(-1)) coefficients
- * needed for LSP to LPC conversion.
- * We only need to calculate the 6 first elements of the polynomial.
- *
- * @param lsp line spectral pairs in cosine domain
- * @param f [out] polynomial input/output as a vector
- *
- * TIA/EIA/IS-733 2.4.3.3.5-1/2
- */
-static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
-{
- int i, j;
-
- f[0] = 1.0;
- f[1] = -2 * lsp[0];
- lsp -= 2;
- for(i=2; i<=lp_half_order; i++)
- {
- double val = -2 * lsp[2*i];
- f[i] = val * f[i-1] + 2*f[i-2];
- for(j=i-1; j>1; j--)
- f[j] += f[j-1] * val + f[j-2];
- f[1] += val;
- }
-}
-
-/**
- * Reconstructs LPC coefficients from the line spectral pair frequencies.
- *
- * @param lsp line spectral pairs in cosine domain
- * @param lpc linear predictive coding coefficients
- */
-void ff_acelp_lspd2lpc(const double *lsp, float *lpc)
-{
- double pa[6], qa[6];
- int i;
-
- lsp2polyf(lsp, pa, 5);
- lsp2polyf(lsp + 1, qa, 5);
-
- for (i=4; i>=0; i--)
- {
- double paf = pa[i+1] + pa[i];
- double qaf = qa[i+1] - qa[i];
-
- lpc[i ] = 0.5*(paf+qaf);
- lpc[9-i] = 0.5*(paf-qaf);
- }
-}
diff --git a/libavcodec/qcelpdec.c b/libavcodec/qcelpdec.c
index 4ba42a1..0df30da 100644
--- a/libavcodec/qcelpdec.c
+++ b/libavcodec/qcelpdec.c
@@ -38,6 +38,7 @@
#include "celp_math.h"
#include "celp_filters.h"
#include "acelp_vectors.h"
+#include "lsp.h"
#undef NDEBUG
#include <assert.h>
@@ -76,13 +77,6 @@ typedef struct
} QCELPContext;
/**
- * Reconstructs LPC coefficients from the line spectral pair frequencies.
- *
- * TIA/EIA/IS-733 2.4.3.3.5
- */
-void ff_acelp_lspd2lpc(const double *lsp, float *lpc);
-
-/**
* Initialize the speech codec according to the specification.
*
* TIA/EIA/IS-733 2.4.9
--
Libav/FFmpeg packaging
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