aacsbr: Make the previous value of bs_num_env local to read_sbr_data().

[ffmpeg] / libavcodec / lsp.c

diff --git a/libavcodec/lsp.c b/libavcodec/lsp.c
index f57f62135009e4715036d12ccb4794da1a04138b..003ffbc63440677a7b176b73f16f9556627a3858 100644 (file)
--- 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.
@@ -46,6 +47,14 @@ void ff_acelp_reorder_lsf(int16_t* lsfq, int lsfq_min_distance, int lsfq_min, in
     lsfq[lp_order-1] = FFMIN(lsfq[lp_order-1], lsfq_max);//Is warning required ?
 }
 
+void ff_set_min_dist_lsf(float *lsf, double min_spacing, int size)
+{
+    int i;
+    float prev = 0.0;
+    for (i = 0; i < size; i++)
+        prev = lsf[i] = FFMAX(lsf[i], prev + min_spacing);
+}
+
 void ff_acelp_lsf2lsp(int16_t *lsp, const int16_t *lsf, int lp_order)
 {
     int i;
@@ -118,3 +127,48 @@ 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);
 }
+
+void ff_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, int lp_half_order)
+{
+    double pa[MAX_LP_HALF_ORDER+1], qa[MAX_LP_HALF_ORDER+1];
+    float *lpc2 = lpc + (lp_half_order << 1) - 1;
+
+    assert(lp_half_order <= MAX_LP_HALF_ORDER);
+
+    ff_lsp2polyf(lsp,     pa, lp_half_order);
+    ff_lsp2polyf(lsp + 1, qa, lp_half_order);
+
+    while (lp_half_order--) {
+        double paf = pa[lp_half_order+1] + pa[lp_half_order];
+        double qaf = qa[lp_half_order+1] - qa[lp_half_order];
+
+        lpc [ lp_half_order] = 0.5*(paf+qaf);
+        lpc2[-lp_half_order] = 0.5*(paf-qaf);
+    }
+}
+
+void ff_sort_nearly_sorted_floats(float *vals, int len)
+{
+    int i,j;
+
+    for (i = 0; i < len - 1; i++)
+        for (j = i; j >= 0 && vals[j] > vals[j+1]; j--)
+            FFSWAP(float, vals[j], vals[j+1]);
+}