Add gradfun filter, ported from MPlayer.

Patch by Nolan L nol888 <=> gmail >=< com.

See thread:
Subject: [FFmpeg-devel] [PATCH] Port gradfun to libavfilter (GCI)
Date: Mon, 29 Nov 2010 07:18:14 -0500

Originally committed as revision 25942 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 48 insertions, 0 deletions

diff --git a/libavfilter/gradfun.h b/libavfilter/gradfun.h
new file mode 100644
index 0000000000..3dacbcb252
--- /dev/null
+++ b/libavfilter/gradfun.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2010 Nolan Lum <nol888@gmail.com>
+ * Copyright (c) 2009 Loren Merritt <lorenm@u.washignton.edu>
+ *
+ * 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 AVFILTER_GRADFUN_H
+#define AVFILTER_GRADFUN_H
+
+#include "avfilter.h"
+
+/// Holds instance-specific information for gradfun.
+typedef struct {
+    int thresh;    ///< threshold for gradient algorithm
+    int radius;    ///< blur radius
+    int chroma_w;  ///< width of the chroma planes
+    int chroma_h;  ///< weight of the chroma planes
+    int chroma_r;  ///< blur radius for the chroma planes
+    uint16_t *buf; ///< holds image data for blur algorithm passed into filter.
+    /// DSP functions.
+    void (*filter_line) (uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
+    void (*blur_line) (uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
+} GradFunContext;
+
+void ff_gradfun_filter_line_c(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
+void ff_gradfun_blur_line_c(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
+
+void ff_gradfun_filter_line_mmx2(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
+void ff_gradfun_filter_line_ssse3(uint8_t *dst, uint8_t *src, uint16_t *dc, int width, int thresh, const uint16_t *dithers);
+
+void ff_gradfun_blur_line_sse2(uint16_t *dc, uint16_t *buf, uint16_t *buf1, uint8_t *src, int src_linesize, int width);
+
+#endif /* AVFILTER_GRADFUN_H */