mlpdec: Move MLP's filter_channel() to dsputils.

Originally committed as revision 18721 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 56 insertions, 0 deletions

diff --git a/libavcodec/mlpdsp.c b/libavcodec/mlpdsp.c
new file mode 100644
index 0000000000..c89bcc508b
--- /dev/null
+++ b/libavcodec/mlpdsp.c
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2007-2008 Ian Caulfield
+ *               2009 Ramiro Polla
+ *
+ * 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
+ */
+
+#include "dsputil.h"
+
+static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder,
+                                  int32_t *iirbuf, const int32_t *iircoeff, int iirorder,
+                                  unsigned int filter_shift, int32_t mask, int blocksize,
+                                  int32_t *sample_buffer)
+{
+    int i;
+
+    for (i = 0; i < blocksize; i++) {
+        int32_t residual = *sample_buffer;
+        unsigned int order;
+        int64_t accum = 0;
+        int32_t result;
+
+        for (order = 0; order < firorder; order++)
+            accum += (int64_t) firbuf[order] * fircoeff[order];
+        for (order = 0; order < iirorder; order++)
+            accum += (int64_t) iirbuf[order] * iircoeff[order];
+
+        accum  = accum >> filter_shift;
+        result = (accum + residual) & mask;
+
+        *--firbuf = result;
+        *--iirbuf = result - accum;
+
+        *sample_buffer = result;
+        sample_buffer += 8;
+    }
+}
+
+void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
+{
+    c->mlp_filter_channel = ff_mlp_filter_channel;
+}