From 48ac225db2563fe534b1d9e999bf8e70d5a577f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelo=20Galv=C4=83o=20P=C3=B3voa?=
 <marspeoplester@gmail.com>
Date: Tue, 7 Sep 2010 20:46:29 +0000
Subject: [PATCH] Move lsp2lpc_sipr() function to common code so it can be
 reused in a AMRWB decoder.
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Patch by Marcelo Galvăo Póvoa.

Originally committed as revision 25062 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/lsp.c  | 26 ++++++++++++++++++++++++++
 libavcodec/lsp.h  |  5 +++++
 libavcodec/sipr.c | 28 +---------------------------
 3 files changed, 32 insertions(+), 27 deletions(-)

diff --git a/libavcodec/lsp.c b/libavcodec/lsp.c
index fa7152737a..98ca490a76 100644
--- a/libavcodec/lsp.c
+++ b/libavcodec/lsp.c
@@ -117,6 +117,32 @@ void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order)
     }
 }
 
+void ff_amrwb_lsp2lpc(const double *lsp, float *lp, int lp_order)
+{
+    int lp_half_order = lp_order >> 1;
+    double buf[lp_half_order + 1];
+    double pa[lp_half_order + 1];
+    double *qa = buf + 1;
+    int i,j;
+
+    qa[-1] = 0.0;
+
+    ff_lsp2polyf(lsp    , pa, lp_half_order    );
+    ff_lsp2polyf(lsp + 1, qa, lp_half_order - 1);
+
+    for (i = 1, j = lp_order - 1; i < lp_half_order; i++, j--) {
+        double paf =  pa[i]            * (1 + lsp[lp_order - 1]);
+        double qaf = (qa[i] - qa[i-2]) * (1 - lsp[lp_order - 1]);
+        lp[i-1]  = (paf + qaf) * 0.5;
+        lp[j-1]  = (paf - qaf) * 0.5;
+    }
+
+    lp[lp_half_order - 1] = (1.0 + lsp[lp_order - 1]) *
+        pa[lp_half_order] * 0.5;
+
+    lp[lp_order - 1] = lsp[lp_order - 1];
+}
+
 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)
 {
     int16_t lsp_1st[MAX_LP_ORDER]; // (0.15)
diff --git a/libavcodec/lsp.h b/libavcodec/lsp.h
index 2c22058062..e3af30d300 100644
--- a/libavcodec/lsp.h
+++ b/libavcodec/lsp.h
@@ -75,6 +75,11 @@ void ff_acelp_lsf2lspd(double *lsp, const float *lsf, int lp_order);
  */
 void ff_acelp_lsp2lpc(int16_t* lp, const int16_t* lsp, int lp_half_order);
 
+/**
+ * LSP to LP conversion (5.2.4 of AMR-WB)
+ */
+void ff_amrwb_lsp2lpc(const double *lsp, float *lp, int lp_order);
+
 /**
  * \brief Interpolate LSP for the first subframe and convert LSP -> LP for both subframes (3.2.5 and 3.2.6 of G.729)
  * \param[out] lp_1st decoded LP coefficients for first subframe  (-0x8000 <= (3.12) < 0x8000)
diff --git a/libavcodec/sipr.c b/libavcodec/sipr.c
index aa798340bb..ba274e6c80 100644
--- a/libavcodec/sipr.c
+++ b/libavcodec/sipr.c
@@ -209,32 +209,6 @@ static void decode_parameters(SiprParameters* parms, GetBitContext *pgb,
     }
 }
 
-static void lsp2lpc_sipr(const double *lsp, float *Az)
-{
-    int lp_half_order = LP_FILTER_ORDER >> 1;
-    double buf[(LP_FILTER_ORDER >> 1) + 1];
-    double pa[(LP_FILTER_ORDER >> 1) + 1];
-    double *qa = buf + 1;
-    int i,j;
-
-    qa[-1] = 0.0;
-
-    ff_lsp2polyf(lsp    , pa, lp_half_order    );
-    ff_lsp2polyf(lsp + 1, qa, lp_half_order - 1);
-
-    for (i = 1, j = LP_FILTER_ORDER - 1; i < lp_half_order; i++, j--) {
-        double paf =  pa[i]            * (1 + lsp[LP_FILTER_ORDER - 1]);
-        double qaf = (qa[i] - qa[i-2]) * (1 - lsp[LP_FILTER_ORDER - 1]);
-        Az[i-1]  = (paf + qaf) * 0.5;
-        Az[j-1]  = (paf - qaf) * 0.5;
-    }
-
-    Az[lp_half_order - 1] = (1.0 + lsp[LP_FILTER_ORDER - 1]) *
-        pa[lp_half_order] * 0.5;
-
-    Az[LP_FILTER_ORDER - 1] = lsp[LP_FILTER_ORDER - 1];
-}
-
 static void sipr_decode_lp(float *lsfnew, const float *lsfold, float *Az,
                            int num_subfr)
 {
@@ -247,7 +221,7 @@ static void sipr_decode_lp(float *lsfnew, const float *lsfold, float *Az,
         for (j = 0; j < LP_FILTER_ORDER; j++)
             lsfint[j] = lsfold[j] * (1 - t) + t * lsfnew[j];
 
-        lsp2lpc_sipr(lsfint, Az);
+        ff_amrwb_lsp2lpc(lsfint, Az, LP_FILTER_ORDER);
         Az += LP_FILTER_ORDER;
         t += t0;
     }