Add optional automatic PicCap handover for non-secure playback

native/playback.h

@@ -0,0 +1,47 @@
+#ifndef HYPERDRM_PLAYBACK_H
+#define HYPERDRM_PLAYBACK_H
+#include <stdbool.h>
+#include <stddef.h>
+#include <string.h>
+#include <dlfcn.h>
+typedef struct {
+ void *lib;void *(*parse)(const char*);int (*get)(const void*,const char*,void**);
+ int (*type)(const void*);size_t (*length)(const void*);void *(*at)(const void*,size_t);
+ const char *(*string)(const void*);int (*boolean)(const void*);int (*put)(void*);
+} PlaybackJson;
+static inline bool playback_json_init(PlaybackJson *j){
+ j->lib=dlopen("libjson-c.so.5",RTLD_NOW);if(!j->lib)return false;
+ j->parse=dlsym(j->lib,"json_tokener_parse");j->get=dlsym(j->lib,"json_object_object_get_ex");
+ j->type=dlsym(j->lib,"json_object_get_type");j->length=dlsym(j->lib,"json_object_array_length");
+ j->at=dlsym(j->lib,"json_object_array_get_idx");j->string=dlsym(j->lib,"json_object_get_string");
+ j->boolean=dlsym(j->lib,"json_object_get_boolean");j->put=dlsym(j->lib,"json_object_put");
+ if(!j->parse||!j->get||!j->type||!j->length||!j->at||!j->string||!j->boolean||!j->put){dlclose(j->lib);j->lib=NULL;return false;}return true;
+}
+static inline void *playback_field(PlaybackJson *j,void *o,const char *key){void *v=NULL;return o && j->type(o)==4 && j->get(o,key,&v)?v:NULL;}
+static inline bool playback_true(PlaybackJson *j,void *o,const char *key){void *v=playback_field(j,o,key);return v && j->type(v)==1 && j->boolean(v);}
+static inline bool playback_is(PlaybackJson *j,void *o,const char *key,const char *value){void *v=playback_field(j,o,key);return v && j->type(v)==6 && strcmp(j->string(v),value)==0;}
+typedef enum {PLAYBACK_UNKNOWN,PLAYBACK_CLEAR,PLAYBACK_PROTECTED} PlaybackProtection;
+/* G4 resource-state classification, not black-frame or app-name guessing.
+ * Any active Secure Video Path wins. Only a foreground media decoder without
+ * a secure resource is eligible; HDMI, idle and malformed replies are unknown. */
+static inline PlaybackProtection playback_classify(PlaybackJson *j,const char *text){
+ void *root=j->parse(text);if(!root)return PLAYBACK_UNKNOWN;
+ bool clear=false,invalid=j->type(root)!=5,secure=false;
+ size_t n=invalid?0:j->length(root);
+ for(size_t i=0;i<n;i++){
+  void *p=j->at(root,i);if(!p || j->type(p)!=4){invalid=true;continue;}
+  void *resources=playback_field(j,p,"resource");if(!resources)resources=playback_field(j,p,"resources");
+  if(!resources || j->type(resources)!=5){invalid=true;continue;}
+  bool decoder=false;
+  for(size_t k=0;k<j->length(resources);k++){
+   void *resource=j->at(resources,k);void *name=playback_field(j,resource,"resource");
+   if(!name || j->type(name)!=6){invalid=true;continue;}
+   const char *s=j->string(name);
+   if(strcmp(s,"SVP_CPB")==0)secure=true;
+   if(strcmp(s,"VDEC")==0)decoder=true;
+  }
+  if(decoder && playback_true(j,p,"is_foreground") && playback_is(j,p,"type","media"))clear=true;
+ }
+ j->put(root);return secure?PLAYBACK_PROTECTED:clear&&!invalid?PLAYBACK_CLEAR:PLAYBACK_UNKNOWN;
+}
+#endif