From 838d803155dd7bcdf87db409af9e151aca3329ae Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20B=C5=93sch?= <ubitux@gmail.com>
Date: Thu, 11 Apr 2013 22:39:42 +0200
Subject: [PATCH] lavfi/mp: switch to an AVOptions-based system.

---
 libavfilter/avfilter.c | 16 +++++++++++++++-
 libavfilter/vf_mp.c    | 20 +++++++++++++++++---
 2 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index d20c74d42a..9cdf12d2d1 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -680,7 +680,6 @@ static const char *const filters_left_to_update[] = {
 #endif
     "atempo",
     "buffer",
-    "mp",
     "pan",
     "scale",
 };
@@ -818,6 +817,21 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
                 goto fail;
 #endif
         } else {
+#if CONFIG_MP_FILTER
+            if (!strcmp(filter->filter->name, "mp")) {
+                char *escaped;
+
+                if (!strncmp(args, "filter=", 7))
+                    args += 7;
+                ret = av_escape(&escaped, args, ":=", AV_ESCAPE_MODE_BACKSLASH, 0);
+                if (ret < 0) {
+                    av_log(filter, AV_LOG_ERROR, "Unable to escape MPlayer filters arg '%s'\n", args);
+                    goto fail;
+                }
+                ret = process_options(filter, &options, escaped);
+                av_free(escaped);
+            } else
+#endif
             ret = process_options(filter, &options, args);
             if (ret < 0)
                 goto fail;
diff --git a/libavfilter/vf_mp.c b/libavfilter/vf_mp.c
index b53624fdc9..eebfa1da85 100644
--- a/libavfilter/vf_mp.c
+++ b/libavfilter/vf_mp.c
@@ -32,6 +32,7 @@
 #include "libavutil/pixdesc.h"
 #include "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
 
 #include "libmpcodecs/vf.h"
 #include "libmpcodecs/img_format.h"
@@ -262,12 +263,23 @@ struct SwsContext *ff_sws_getContextFromCmdLine(int srcW, int srcH, int srcForma
 }
 
 typedef struct {
+    const AVClass *class;
     vf_instance_t vf;
     vf_instance_t next_vf;
     AVFilterContext *avfctx;
     int frame_returned;
+    char *filter;
 } MPContext;
 
+#define OFFSET(x) offsetof(MPContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption mp_options[] = {
+    { "filter", "set MPlayer filter name and parameters", OFFSET(filter), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(mp);
+
 void ff_mp_msg(int mod, int lev, const char *format, ... ){
     va_list va;
     va_start(va, format);
@@ -533,7 +545,7 @@ mp_image_t* ff_vf_get_image(vf_instance_t* vf, unsigned int outfmt, int mp_imgty
 static void dummy_free(void *opaque, uint8_t *data){}
 
 int ff_vf_next_put_image(struct vf_instance *vf,mp_image_t *mpi, double pts){
-    MPContext *m= (void*)vf;
+    MPContext *m= (MPContext*)(((uint8_t*)vf) - offsetof(MPContext, vf));
     AVFilterLink *outlink     = m->avfctx->outputs[0];
     AVFrame *picref = av_frame_alloc();
     int i;
@@ -605,13 +617,13 @@ int ff_vf_next_config(struct vf_instance *vf,
 }
 
 int ff_vf_next_control(struct vf_instance *vf, int request, void* data){
-    MPContext *m= (void*)vf;
+    MPContext *m= (MPContext*)(((uint8_t*)vf) - offsetof(MPContext, vf));
     av_log(m->avfctx, AV_LOG_DEBUG, "Received control %d\n", request);
     return 0;
 }
 
 static int vf_default_query_format(struct vf_instance *vf, unsigned int fmt){
-    MPContext *m= (void*)vf;
+    MPContext *m= (MPContext*)(((uint8_t*)vf) - offsetof(MPContext, vf));
     int i;
     av_log(m->avfctx, AV_LOG_DEBUG, "query %X\n", fmt);
 
@@ -644,6 +656,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
 
     m->avfctx= ctx;
 
+    args = m->filter;
     if(!args || 1!=sscanf(args, "%255[^:=]", name)){
         av_log(ctx, AV_LOG_ERROR, "Invalid parameter.\n");
         return AVERROR(EINVAL);
@@ -850,4 +863,5 @@ AVFilter avfilter_vf_mp = {
     .query_formats = query_formats,
     .inputs        = mp_inputs,
     .outputs       = mp_outputs,
+    .priv_class    = &mp_class,
 };