Add functions to return library license and library configuration.

[ffmpeg] / libavcodec / lsp.c

diff --git a/libavcodec/lsp.c b/libavcodec/lsp.c
index 5b5fc1c50e8cfe6ba5222aacd6e4760a76d227e0..ce0fbc28b85d6935c41203d553d1e9c54c37b5b7 100644 (file)
--- a/libavcodec/lsp.c
+++ b/libavcodec/lsp.c
@@ -47,6 +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;
@@ -147,20 +155,21 @@ static void lsp2polyf(const double *lsp, double *f, int lp_half_order)
     }
 }
 
-void ff_acelp_lspd2lpc(const double *lsp, float *lpc)
+void ff_acelp_lspd2lpc(const double *lsp, float *lpc, int lp_half_order)
 {
-    double pa[6], qa[6];
-    int   i;
+    double pa[MAX_LP_HALF_ORDER+1], qa[MAX_LP_HALF_ORDER+1];
+    float *lpc2 = lpc + (lp_half_order << 1) - 1;
 
-    lsp2polyf(lsp,     pa, 5);
-    lsp2polyf(lsp + 1, qa, 5);
+    assert(lp_half_order <= MAX_LP_HALF_ORDER);
 
-    for (i=4; i>=0; i--)
-    {
-        double paf = pa[i+1] + pa[i];
-        double qaf = qa[i+1] - qa[i];
+    lsp2polyf(lsp,     pa, lp_half_order);
+    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[i  ] = 0.5*(paf+qaf);
-        lpc[9-i] = 0.5*(paf-qaf);
+        lpc [ lp_half_order] = 0.5*(paf+qaf);
+        lpc2[-lp_half_order] = 0.5*(paf-qaf);
     }
 }