[rygel/wip/dvd-byteseek: 4/5] WIP

[Jens Georg <jensgeorg src gnome org>]

commit 6130c0b9500b68b1a27648ff568dec585343b4ec
Author: Jens Georg <mail jensge org>
Date:   Sun Feb 28 00:36:05 2016 +0100

    WIP

 .../gstreamer/rygel-gst-data-source.vala           |   18 +++++
 .../rygel-media-export-dvd-parser.vala             |   70 ++++++++++++--------
 .../media-export/rygel-media-export-dvd-track.vala |    5 +-
 3 files changed, 63 insertions(+), 30 deletions(-)
---
diff --git a/src/media-engines/gstreamer/rygel-gst-data-source.vala 
b/src/media-engines/gstreamer/rygel-gst-data-source.vala
index 198ada5..2f860e0 100644
--- a/src/media-engines/gstreamer/rygel-gst-data-source.vala
+++ b/src/media-engines/gstreamer/rygel-gst-data-source.vala
@@ -280,6 +280,14 @@ internal class Rygel.GstDataSource : Rygel.DataSource, GLib.Object {
         return ret;
     }
 
+    // Work-Around for https://bugzilla.gnome.org/show_bug.cgi?id=762795
+    [CCode (cname="gst_element_query_convert")]
+    extern static bool element_query_convert (Gst.Element element,
+                                       Gst.Format src_format,
+                                       int64 src_val,
+                                       Gst.Format dest_format,
+                                       out int64 dst_val);
+
     private bool perform_seek () {
         var stop_type = Gst.SeekType.NONE;
         Format format;
@@ -312,6 +320,16 @@ internal class Rygel.GstDataSource : Rygel.DataSource, GLib.Object {
             debug ("Performing byte-range seek: bytes %lld to %lld",
                    start,
                    stop);
+            if (this.src.name == "dvdreadsrc") {
+                int64 offset;
+                element_query_convert (this.src,
+                                                Gst.Format.TIME,
+                                                1 * Gst.SECOND,
+                                                Gst.Format.BYTES,
+                                                out offset);
+                start += offset;
+                stop = 0;
+            }
         } else {
             var result = new DataSourceError.SEEK_FAILED
                                         (_("Unsupported seek type"));
diff --git a/src/plugins/media-export/rygel-media-export-dvd-parser.vala 
b/src/plugins/media-export/rygel-media-export-dvd-parser.vala
index 6d9bbcc..b6eac7f 100644
--- a/src/plugins/media-export/rygel-media-export-dvd-parser.vala
+++ b/src/plugins/media-export/rygel-media-export-dvd-parser.vala
@@ -67,12 +67,7 @@ internal class Rygel.DVDParser : GLib.Object {
             throw new DVDParserError.NOT_AVAILABLE ("No DVD extractor found");
         }
 
-        var doc = yield this.get_information ();
-        if (doc == null) {
-            throw new DVDParserError.GENERAL ("Failed to read cache file");
-        }
-
-        delete doc;
+        yield this.get_information ();
     }
 
     public async void get_information () throws Error {
@@ -89,9 +84,9 @@ internal class Rygel.DVDParser : GLib.Object {
 
             var process = new Subprocess.newv (args, SubprocessFlags.STDOUT_PIPE);
 
-            string buffer;
+            Bytes bytes = null;
 
-            yield process.communicate_utf8_async (null, null, out buffer, null);
+            yield process.communicate_async (null, null, out bytes, null);
 
             if (!(process.get_if_exited () &&
                 process.get_exit_status () == 0)) {
@@ -103,8 +98,8 @@ internal class Rygel.DVDParser : GLib.Object {
                 throw new DVDParserError.GENERAL ("lsdvd did die or file is not a DVD");
             }
 
-            var doc = Xml.Parser.read_memory (buffer,
-                                              buffer.length,
+            var doc = Xml.Parser.read_memory ((string) bytes.get_data (),
+                                              (int) bytes.get_size (),
                                               null,
                                               "UTF-8",
                                               Xml.ParserOption.NOBLANKS |
@@ -117,24 +112,26 @@ internal class Rygel.DVDParser : GLib.Object {
             var result = context.eval_expression ("/lsdvd/track");
 
             if (result != null) {
-                if (result->type == Xml.XPath.ObjectType.NODESET &&
-                    result->nodesetval->length () == 1) {
-                    var node = result->nodesetval->item (0);
-                    try {
-                        var duration = yield this.query_length ();
-                        var duration_node = doc->new_node (null,
-                                                           "rygel:bytelength",
-                                                           "%lld".printf (duration));
-                        node->add_child (duration_node);
-                    } catch (Error error) {
-                        warning (_("Failed to query length from DVD: %s"),
-                                 error.message);
+                if (result->type == Xml.XPath.ObjectType.NODESET) {
+                    for (int i = 0; i < result->nodesetval->length (); i++) {
+                        var it = result->nodesetval->item (i);
+                        try {
+                            var duration = yield this.query_length (i + 1);
+                            var node = doc->new_node (null,
+                                                      "rygel:bytelength",
+                                                      "%lld".printf (duration));
+                            it->add_child (node);
+                        } catch (Error error) {
+                            warning (_("Failed to query length from DVD: %s"),
+                                     error.message);
+                        }
                     }
                 }
 
                 delete result;
             }
 
+            string buffer;
             doc->dump_memory_enc_format (out buffer, null, "UTF-8", false);
             delete doc;
 
@@ -147,9 +144,20 @@ internal class Rygel.DVDParser : GLib.Object {
          }
     }
 
-    private async int64 query_length () throws Error {
+    // Work-Around for https://bugzilla.gnome.org/show_bug.cgi?id=762795
+    [CCode (cname="gst_element_query_convert")]
+    extern static bool element_query_convert (Gst.Element element,
+                                       Gst.Format src_format,
+                                       int64 src_val,
+                                       Gst.Format dest_format,
+                                       out int64 dst_val);
+
+    private async int64 query_length (int title)
+                                      throws Error {
         bool failed = false;
 
+        warning ("Guessing length from track");
+
         var pipeline = new Gst.Pipeline ("DVD title size query");
         dynamic Gst.Element? src = Gst.ElementFactory.make ("dvdreadsrc", "src");
         var sink = Gst.ElementFactory.make ("fakesink", "sink");
@@ -162,6 +170,7 @@ internal class Rygel.DVDParser : GLib.Object {
         pipeline.add_many (src, sink);
         src.link (sink);
         src.device = file.get_path ();
+        src.title = title;
 
         var bus = pipeline.get_bus ();
         bus.add_signal_watch ();
@@ -188,11 +197,18 @@ internal class Rygel.DVDParser : GLib.Object {
             throw new DVDParserError.GENERAL (_("Querying the size of the tile failed"));
         }
 
-        int64 duration;
-        pipeline.query_duration (Gst.Format.BYTES, out duration);
+        int64 end;
+        pipeline.query_duration (Gst.Format.TIME, out end);
+
+        int64 start;
+        element_query_convert (pipeline, Gst.Format.TIME, 1 * Gst.SECOND,
+                               Gst.Format.BYTES, out start);
+
 
-        warning ("DVD title has %lld bytes", duration);
+        int64 stop;
+        element_query_convert (pipeline, Gst.Format.TIME, end / 2,
+                               Gst.Format.BYTES, out stop);
 
-        return duration;
+        return (stop * 2) - start;
     }
 }
diff --git a/src/plugins/media-export/rygel-media-export-dvd-track.vala 
b/src/plugins/media-export/rygel-media-export-dvd-track.vala
index 769af92..6445170 100644
--- a/src/plugins/media-export/rygel-media-export-dvd-track.vala
+++ b/src/plugins/media-export/rygel-media-export-dvd-track.vala
@@ -55,7 +55,6 @@ internal class Rygel.MediaExport.DVDTrack : VideoItem {
 
             var it = node->children;
             while (it != null) {
-            warning ("name: %s", it->name);
                 if (it->name == "length") {
                     this.duration = (int) double.parse (it->children->content);
                 } else if (it->name == "width") {
@@ -64,8 +63,8 @@ internal class Rygel.MediaExport.DVDTrack : VideoItem {
                     this.height = int.parse (it->children->content);
             } else if (it->name == "format") {
                 this.dlna_profile += "_" + it->children->content;
- /*           } else if (it->name == "rygel:bytelength") {
-                this.size = int64.parse (it->children->content); */
+            } else if (it->name == "rygel:bytelength") {
+                this.size = int64.parse (it->children->content);
                 }
                 // TODO: Japanese formats...
                 it = it->next;