Implement libopencv smooth filter.

Originally committed as revision 25118 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 156 insertions, 0 deletions

diff --git a/libavfilter/vf_libopencv.c b/libavfilter/vf_libopencv.c
new file mode 100644
index 0000000000..63d5b61004
--- /dev/null
+++ b/libavfilter/vf_libopencv.c
@@ -0,0 +1,156 @@
+/*
+ * copyright Stefano Sabatini 2010
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * libopencv wrapper functions
+ */
+
+#include "opencv/cv.h"
+#include "opencv/cxtypes.h"
+#include "avfilter.h"
+
+static void fill_iplimage_from_picref(IplImage *img, const AVFilterBufferRef *picref, enum PixelFormat pixfmt)
+{
+    IplImage *tmpimg;
+    int depth, channels_nb;
+
+    if      (pixfmt == PIX_FMT_GRAY8) { depth = IPL_DEPTH_8U;  channels_nb = 1; }
+    else if (pixfmt == PIX_FMT_BGRA)  { depth = IPL_DEPTH_8U;  channels_nb = 4; }
+    else if (pixfmt == PIX_FMT_BGR24) { depth = IPL_DEPTH_8U;  channels_nb = 3; }
+    else return;
+
+    tmpimg = cvCreateImageHeader((CvSize){picref->video->w, picref->video->h}, depth, channels_nb);
+    *img = *tmpimg;
+    img->imageData = img->imageDataOrigin = picref->data[0];
+    img->dataOrder = IPL_DATA_ORDER_PIXEL;
+    img->origin    = IPL_ORIGIN_TL;
+    img->widthStep = picref->linesize[0];
+}
+
+static void fill_picref_from_iplimage(AVFilterBufferRef *picref, const IplImage *img, enum PixelFormat pixfmt)
+{
+    picref->linesize[0] = img->widthStep;
+    picref->data[0]     = img->imageData;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+    static const enum PixelFormat pix_fmts[] = {
+        PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_GRAY8, PIX_FMT_NONE
+    };
+
+    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
+    return 0;
+}
+
+static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
+
+#if CONFIG_OCV_SMOOTH_FILTER
+
+typedef struct {
+    int type;
+    int    param1, param2;
+    double param3, param4;
+} SmoothContext;
+
+static av_cold int smooth_init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    SmoothContext *smooth = ctx->priv;
+    char type_str[128] = "gaussian";
+
+    smooth->param1 = 3;
+    smooth->param2 = 0;
+    smooth->param3 = 0.0;
+    smooth->param4 = 0.0;
+
+    if (args)
+        sscanf(args, "%127[^:]:%d:%d:%lf:%lf", type_str, &smooth->param1, &smooth->param2, &smooth->param3, &smooth->param4);
+
+    if      (!strcmp(type_str, "blur"         )) smooth->type = CV_BLUR;
+    else if (!strcmp(type_str, "blur_no_scale")) smooth->type = CV_BLUR_NO_SCALE;
+    else if (!strcmp(type_str, "median"       )) smooth->type = CV_MEDIAN;
+    else if (!strcmp(type_str, "gaussian"     )) smooth->type = CV_GAUSSIAN;
+    else if (!strcmp(type_str, "bilateral"    )) smooth->type = CV_BILATERAL;
+    else {
+        av_log(ctx, AV_LOG_ERROR, "Smoothing type '%s' unknown\n.", type_str);
+        return AVERROR(EINVAL);
+    }
+
+    if (smooth->param1 < 0 || !(smooth->param1%2)) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Invalid value '%d' for param1, it has to be a positive odd number\n",
+               smooth->param1);
+        return AVERROR(EINVAL);
+    }
+    if ((smooth->type == CV_BLUR || smooth->type == CV_BLUR_NO_SCALE || smooth->type == CV_GAUSSIAN) &&
+        (smooth->param2 < 0 || (smooth->param2 && !(smooth->param2%2)))) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Invalid value '%d' for param2, it has to be zero or a positive odd number\n",
+               smooth->param2);
+        return AVERROR(EINVAL);
+    }
+
+    av_log(ctx, AV_LOG_INFO, "type:%s param1:%d param2:%d param3:%f param4:%f\n",
+           type_str, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
+    return 0;
+}
+
+static void smooth_end_frame(AVFilterLink *inlink)
+{
+    SmoothContext *smooth = inlink->dst->priv;
+    AVFilterLink *outlink= inlink->dst->outputs[0];
+    AVFilterBufferRef *inpicref  = inlink ->cur_buf;
+    AVFilterBufferRef *outpicref = outlink->out_buf;
+    IplImage inimg, outimg;
+
+    fill_iplimage_from_picref(&inimg , inpicref , inlink->format);
+    fill_iplimage_from_picref(&outimg, outpicref, inlink->format);
+    cvSmooth(&inimg, &outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
+    fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
+
+    avfilter_unref_buffer(inpicref);
+    avfilter_draw_slice(outlink, 0, outlink->h, 1);
+    avfilter_end_frame(outlink);
+    avfilter_unref_buffer(outpicref);
+}
+
+AVFilter avfilter_vf_ocv_smooth = {
+    .name        = "ocv_smooth",
+    .description = "Apply smooth transform using libopencv.",
+
+    .priv_size = sizeof(SmoothContext),
+
+    .query_formats = query_formats,
+    .init = smooth_init,
+
+    .inputs    = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO,
+                                    .draw_slice       = null_draw_slice,
+                                    .end_frame        = smooth_end_frame,
+                                    .min_perms        = AV_PERM_READ },
+                                  { .name = NULL}},
+
+    .outputs   = (AVFilterPad[]) {{ .name             = "default",
+                                    .type             = AVMEDIA_TYPE_VIDEO, },
+                                  { .name = NULL}},
+};
+
+#endif /* CONFIG_OCV_SMOOTH_FILTER */