* Add Video4MotionVector in a stream description to behave like the -4mv flag

* Add ReadOnlyFile which behaves like File, but does not permit changing of the
  file. This can be used to prevent deleting of saved ffm files.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@1743 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

doc/ffserver.conf

@@ -46,6 +46,10 @@ NoDaemon
 File /tmp/feed1.ffm
 FileMaxSize 200K
 
+# You could specify
+# ReadOnlyFile /saved/specialvideo.ffm
+# This marks the file as readonly and it will not be deleted or updated
+
 # Specify launch in order to start ffmpeg automatically
 #Launch
 
@@ -110,6 +114,10 @@ VideoSize 160x128
 # frames Video synchronization can only begin at an I frames.
 VideoGopSize 12
 
+# More MPEG4 parameters
+# VideoHighQuality
+# Video4MotionVector
+
 # Choose your codecs: 
 #AudioCodec mp2
 #VideoCodec mpeg1video

ffserver.c

@@ -208,6 +208,7 @@ typedef struct FFStream {
     /* feed specific */
     int feed_opened;     /* true if someone is writing to the feed */
     int is_feed;         /* true if it is a feed */
+    int readonly;        /* True if writing is prohibited to the file */
     int conns_served;
     int64_t bytes_served;
     int64_t feed_max_size;      /* maximum storage size */
@@ -2389,6 +2390,10 @@ static int http_start_receive_data(HTTPContext *c)
     if (c->stream->feed_opened)
         return -1;
 
+    /* Don't permit writing to this one */
+    if (c->stream->readonly)
+        return -1;
+
     /* open feed */
     fd = open(c->stream->feed_filename, O_RDWR);
     if (fd < 0)
@@ -3455,12 +3460,24 @@ static void build_feed_streams(void)
                 printf("Deleting feed file '%s' as it appears to be corrupt\n",
                         feed->feed_filename);
             }
-            if (!matches)
+            if (!matches) {
+                if (feed->readonly) {
+                    printf("Unable to delete feed file '%s' as it is marked readonly\n",
+                        feed->feed_filename);
+                    exit(1);
+                }
                 unlink(feed->feed_filename);
+            }
         }
         if (!url_exist(feed->feed_filename)) {
             AVFormatContext s1, *s = &s1;
 
+            if (feed->readonly) {
+                printf("Unable to create feed file '%s' as it is marked readonly\n",
+                    feed->feed_filename);
+                exit(1);
+            }
+
             /* only write the header of the ffm file */
             if (url_fopen(&s->pb, feed->feed_filename, URL_WRONLY) < 0) {
                 fprintf(stderr, "Could not open output feed file '%s'\n",
@@ -3815,6 +3832,13 @@ static int parse_ffconfig(const char *filename)
                 snprintf(feed->child_argv[i], 256, "http://127.0.0.1:%d/%s", 
                     ntohs(my_http_addr.sin_port), feed->filename);
             }
+        } else if (!strcasecmp(cmd, "ReadOnlyFile")) {
+            if (feed) {
+                get_arg(feed->feed_filename, sizeof(feed->feed_filename), &p);
+                feed->readonly = 1;
+            } else if (stream) {
+                get_arg(stream->feed_filename, sizeof(stream->feed_filename), &p);
+            }
         } else if (!strcasecmp(cmd, "File")) {
             if (feed) {
                 get_arg(feed->feed_filename, sizeof(feed->feed_filename), &p);
@@ -4053,6 +4077,11 @@ static int parse_ffconfig(const char *filename)
             if (stream) {
                 video_enc.flags |= CODEC_FLAG_HQ;
             }
+        } else if (!strcasecmp(cmd, "Video4MotionVector")) {
+            if (stream) {
+                video_enc.flags |= CODEC_FLAG_HQ;
+                video_enc.flags |= CODEC_FLAG_4MV;
+            }
         } else if (!strcasecmp(cmd, "VideoQDiff")) {
             get_arg(arg, sizeof(arg), &p);
             if (stream) {