Updated FFmpeg

git-svn-id: https://mpc-hc.svn.sourceforge.net/svnroot/mpc-hc/trunk@1792 10f7b99b-c216-0410-bff0-8a66a9350fd8

1 files changed, 81 insertions, 0 deletions

diff --git a/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/lpc.h b/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/lpc.h
new file mode 100644
index 000000000..c8053d0d7
--- /dev/null
+++ b/src/filters/transform/MPCVideoDec/ffmpeg/libavcodec/lpc.h
@@ -0,0 +1,81 @@
+/**
+ * LPC utility code
+ * Copyright (c) 2006  Justin Ruggles <justin.ruggles@gmail.com>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_LPC_H
+#define AVCODEC_LPC_H
+
+#include <stdint.h>
+
+#ifdef LPC_USE_DOUBLE
+#define LPC_TYPE double
+#else
+#define LPC_TYPE float
+#endif
+
+/**
+ * Levinson-Durbin recursion.
+ * Produces LPC coefficients from autocorrelation data.
+ */
+static inline int compute_lpc_coefs(const LPC_TYPE *autoc, int max_order,
+                                    LPC_TYPE *lpc, int lpc_stride, int fail,
+                                    int normalize)
+{
+    int i, j;
+    LPC_TYPE err;
+    LPC_TYPE *lpc_last = lpc;
+
+    if (normalize)
+        err = *autoc++;
+
+    if (fail && (autoc[max_order - 1] == 0 || err <= 0))
+        return -1;
+
+    for(i=0; i<max_order; i++) {
+        LPC_TYPE r = -autoc[i];
+
+        if (normalize) {
+            for(j=0; j<i; j++)
+                r -= lpc_last[j] * autoc[i-j-1];
+
+            r /= err;
+            err *= 1.0 - (r * r);
+        }
+
+        lpc[i] = r;
+
+        for(j=0; j < (i+1)>>1; j++) {
+            LPC_TYPE f = lpc_last[    j];
+            LPC_TYPE b = lpc_last[i-1-j];
+            lpc[    j] = f + r * b;
+            lpc[i-1-j] = b + r * f;
+        }
+
+        if (fail && err < 0)
+            return -1;
+
+        lpc_last = lpc;
+        lpc += lpc_stride;
+    }
+
+    return 0;
+}
+
+#endif /* AVCODEC_LPC_H */