Redesign the libopencv wrapper to make it more generic. Accept both

FILTERNAME=ARGS and FILTERNAME:ARGS syntax.

The same filter class will be used for managing all the libopencv
filtering functions.

Originally committed as revision 26079 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog

@@ -66,6 +66,7 @@ version <next>:
 - FLAC parser added
 - gradfun filter added
 - AMR-WB decoder
+- replace the ocv_smooth filter by a more generic ocv filter
 
 
 version 0.6:

configure

@@ -1413,7 +1413,7 @@ cropdetect_filter_deps="gpl"
 frei0r_filter_deps="frei0r dlopen strtok_r"
 frei0r_src_filter_deps="frei0r dlopen strtok_r"
 hqdn3d_filter_deps="gpl"
-ocv_smooth_filter_deps="libopencv"
+ocv_filter_deps="libopencv"
 yadif_filter_deps="gpl"
 
 # libraries

doc/filters.texi

@@ -512,14 +512,31 @@ input to the vflip filter.
 
 Pass the video source unchanged to the output.
 
-@section ocv_smooth
+@section ocv
 
-Apply smooth transform using libopencv.
+Apply video transform using libopencv.
 
 To enable this filter install libopencv library and headers and
 configure FFmpeg with --enable-libopencv.
 
-The filter accepts the following parameters:
+The filter takes the parameters: @var{filter_name}@{:=@}@var{filter_params}.
+
+@var{filter_name} is the name of the libopencv filter to apply.
+
+@var{filter_params} specifies the parameters to pass to the libopencv
+filter. If not specified the default values are assumed.
+
+Refer to the official libopencv documentation for more precise
+informations:
+@url{http://opencv.willowgarage.com/documentation/c/image_filtering.html}
+
+Follows the list of supported libopencv filters.
+
+@subsection smooth
+
+Smooth the input video.
+
+The filter takes the following parameters:
 @var{type}:@var{param1}:@var{param2}:@var{param3}:@var{param4}.
 
 @var{type} is the type of smooth filter to apply, and can be one of
@@ -535,9 +552,7 @@ The default value for @var{param1} is 3, the default value for the
 other parameters is 0.
 
 These parameters correspond to the parameters assigned to the
-libopencv function @code{cvSmooth}. Refer to the official libopencv
-documentation for the exact meaning of the parameters:
-@url{http://opencv.willowgarage.com/documentation/c/image_filtering.html}
+libopencv function @code{cvSmooth}.
 
 @section overlay
 

libavfilter/Makefile

@@ -31,7 +31,7 @@ OBJS-$(CONFIG_HFLIP_FILTER)                  += vf_hflip.o
 OBJS-$(CONFIG_HQDN3D_FILTER)                 += vf_hqdn3d.o
 OBJS-$(CONFIG_NOFORMAT_FILTER)               += vf_format.o
 OBJS-$(CONFIG_NULL_FILTER)                   += vf_null.o
-OBJS-$(CONFIG_OCV_SMOOTH_FILTER)             += vf_libopencv.o
+OBJS-$(CONFIG_OCV_FILTER)                    += vf_libopencv.o
 OBJS-$(CONFIG_OVERLAY_FILTER)                += vf_overlay.o
 OBJS-$(CONFIG_PAD_FILTER)                    += vf_pad.o
 OBJS-$(CONFIG_PIXDESCTEST_FILTER)            += vf_pixdesctest.o

libavfilter/allfilters.c

@@ -52,7 +52,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER (HQDN3D,      hqdn3d,      vf);
     REGISTER_FILTER (NOFORMAT,    noformat,    vf);
     REGISTER_FILTER (NULL,        null,        vf);
-    REGISTER_FILTER (OCV_SMOOTH,  ocv_smooth,  vf);
+    REGISTER_FILTER (OCV,         ocv,         vf);
     REGISTER_FILTER (OVERLAY,     overlay,     vf);
     REGISTER_FILTER (PAD,         pad,         vf);
     REGISTER_FILTER (PIXDESCTEST, pixdesctest, vf);

libavfilter/avfilter.h

@@ -27,7 +27,7 @@
 #include "libavcore/samplefmt.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  1
-#define LIBAVFILTER_VERSION_MINOR 69
+#define LIBAVFILTER_VERSION_MINOR 70
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_libopencv.c

@@ -63,7 +63,13 @@ static int query_formats(AVFilterContext *ctx)
 
 static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
 
-#if CONFIG_OCV_SMOOTH_FILTER
+typedef struct {
+    const char *name;
+    int (*init)(AVFilterContext *ctx, const char *args, void *opaque);
+    void (*uninit)(AVFilterContext *ctx);
+    void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
+    void *priv;
+} OCVContext;
 
 typedef struct {
     int type;
@@ -73,7 +79,8 @@ typedef struct {
 
 static av_cold int smooth_init(AVFilterContext *ctx, const char *args, void *opaque)
 {
-    SmoothContext *smooth = ctx->priv;
+    OCVContext *ocv = ctx->priv;
+    SmoothContext *smooth = ocv->priv;
     char type_str[128] = "gaussian";
 
     smooth->param1 = 3;
@@ -113,17 +120,74 @@ static av_cold int smooth_init(AVFilterContext *ctx, const char *args, void *opa
     return 0;
 }
 
-static void smooth_end_frame(AVFilterLink *inlink)
+static void smooth_end_frame_filter(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg)
 {
-    SmoothContext *smooth = inlink->dst->priv;
-    AVFilterLink *outlink = inlink->dst->outputs[0];
+    OCVContext *ocv = ctx->priv;
+    SmoothContext *smooth = ocv->priv;
+    cvSmooth(inimg, outimg, smooth->type, smooth->param1, smooth->param2, smooth->param3, smooth->param4);
+}
+
+typedef struct {
+    const char *name;
+    size_t priv_size;
+    int  (*init)(AVFilterContext *ctx, const char *args, void *opaque);
+    void (*uninit)(AVFilterContext *ctx);
+    void (*end_frame_filter)(AVFilterContext *ctx, IplImage *inimg, IplImage *outimg);
+} OCVFilterEntry;
+
+static OCVFilterEntry ocv_filter_entries[] = {
+    { "smooth", sizeof(SmoothContext), smooth_init, NULL, smooth_end_frame_filter },
+};
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+    OCVContext *ocv = ctx->priv;
+    char name[128], priv_args[1024];
+    int i;
+    char c;
+
+    sscanf(args, "%127[^=:]%c%1023s", name, &c, priv_args);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(ocv_filter_entries); i++) {
+        OCVFilterEntry *entry = &ocv_filter_entries[i];
+        if (!strcmp(name, entry->name)) {
+            ocv->name             = entry->name;
+            ocv->init             = entry->init;
+            ocv->uninit           = entry->uninit;
+            ocv->end_frame_filter = entry->end_frame_filter;
+
+            if (!(ocv->priv = av_mallocz(entry->priv_size)))
+                return AVERROR(ENOMEM);
+            return ocv->init(ctx, priv_args, opaque);
+        }
+    }
+
+    av_log(ctx, AV_LOG_ERROR, "No libopencv filter named '%s'\n", name);
+    return AVERROR(EINVAL);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    OCVContext *ocv = ctx->priv;
+
+    if (ocv->uninit)
+        ocv->uninit(ctx);
+    av_free(ocv->priv);
+    memset(ocv, 0, sizeof(*ocv));
+}
+
+static void end_frame(AVFilterLink *inlink)
+{
+    AVFilterContext *ctx = inlink->dst;
+    OCVContext *ocv = ctx->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);
+    ocv->end_frame_filter(ctx, &inimg, &outimg);
     fill_picref_from_iplimage(outpicref, &outimg, inlink->format);
 
     avfilter_unref_buffer(inpicref);
@@ -132,19 +196,20 @@ static void smooth_end_frame(AVFilterLink *inlink)
     avfilter_unref_buffer(outpicref);
 }
 
-AVFilter avfilter_vf_ocv_smooth = {
-    .name        = "ocv_smooth",
-    .description = NULL_IF_CONFIG_SMALL("Apply smooth transform using libopencv."),
+AVFilter avfilter_vf_ocv = {
+    .name        = "ocv",
+    .description = NULL_IF_CONFIG_SMALL("Apply transform using libopencv."),
 
-    .priv_size = sizeof(SmoothContext),
+    .priv_size = sizeof(OCVContext),
 
     .query_formats = query_formats,
-    .init = smooth_init,
+    .init = init,
+    .uninit = uninit,
 
     .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                     .type             = AVMEDIA_TYPE_VIDEO,
                                     .draw_slice       = null_draw_slice,
-                                    .end_frame        = smooth_end_frame,
+                                    .end_frame        = end_frame,
                                     .min_perms        = AV_PERM_READ },
                                   { .name = NULL}},
 
@@ -152,5 +217,3 @@ AVFilter avfilter_vf_ocv_smooth = {
                                     .type             = AVMEDIA_TYPE_VIDEO, },
                                   { .name = NULL}},
 };
-
-#endif /* CONFIG_OCV_SMOOTH_FILTER */