Write track and segment UIDs, write muxing date, write TRACKDEFAULTDURATION for TTA audio, write BLOCKDURATION if known.

Original commit message from CVS:
Write track and segment UIDs, write muxing date, write TRACKDEFAULTDURATION for TTA audio, write BLOCKDURATION if known.

ChangeLog

@@ -1,3 +1,17 @@
+2004-09-01  Arwed v. Merkatz  <v.merkatz@gmx.net>
+
+	* gst/matroska/ebml-ids.h:
+	* gst/matroska/ebml-read.c: (gst_ebml_read_date):
+	* gst/matroska/ebml-write.c: (gst_ebml_write_date):
+	  automatically convert unix time <-> ebml time when reading/writing a date
+	* gst/matroska/matroska-ids.h:
+	* gst/matroska/matroska-mux.c: (gst_matroska_mux_create_uid),
+	(gst_matroska_mux_reset), (gst_matroska_mux_audio_pad_link),
+	(gst_matroska_mux_track_header), (gst_matroska_mux_start),
+	(gst_matroska_mux_write_data):
+	  Write track and segment UIDs, write muxing date, write
+		TRACKDEFAULTDURATION for TTA audio, write BLOCKDURATION if known.
+
 2004-08-31  Ronald S. Bultje  <rbultje@ronald.bitfreak.net>
 
 	* ext/alsa/gstalsamixer.c: (gst_alsa_mixer_build_list):

gst/matroska/ebml-ids.h

@@ -42,6 +42,9 @@ G_BEGIN_DECLS
 /* general EBML types */
 #define GST_EBML_ID_VOID               0xEC
 
+/* EbmlDate offset from the unix epoch in seconds, 2001/01/01 00:00:00 UTC */
+#define GST_EBML_DATE_OFFSET           978307200
+
 G_END_DECLS
 
 #endif /* __GST_EBML_IDS_H__ */

gst/matroska/ebml-read.c

@@ -591,13 +591,18 @@ gst_ebml_read_utf8 (GstEbmlRead * ebml, guint32 * id, gchar ** str)
 }
 
 /*
- * Read the next element as a date (nanoseconds since 1/1/2000).
+ * Read the next element as a date.
+ * Returns the seconds since the unix epoch.
  */
 
 gboolean
 gst_ebml_read_date (GstEbmlRead * ebml, guint32 * id, gint64 * date)
 {
-  return gst_ebml_read_sint (ebml, id, date);
+  gint64 ebml_date;
+  gboolean res = gst_ebml_read_sint (ebml, id, &ebml_date);
+
+  *date = (ebml_date / GST_SECOND) + GST_EBML_DATE_OFFSET;
+  return res;
 }
 
 /*

gst/matroska/ebml-write.c

@@ -430,10 +430,11 @@ gst_ebml_write_utf8 (GstEbmlWrite * ebml, guint32 id, const gchar * str)
   gst_ebml_write_ascii (ebml, id, str);
 }
 
+/* date should be in seconds since the unix epoch */
 void
 gst_ebml_write_date (GstEbmlWrite * ebml, guint32 id, gint64 date)
 {
-  gst_ebml_write_sint (ebml, id, date);
+  gst_ebml_write_sint (ebml, id, (date - GST_EBML_DATE_OFFSET) * GST_SECOND);
 }
 
 /*

gst/matroska/matroska-ids.h

@@ -45,6 +45,7 @@
 #define GST_MATROSKA_ID_WRITINGAPP 0x5741
 #define GST_MATROSKA_ID_MUXINGAPP  0x4D80
 #define GST_MATROSKA_ID_DATEUTC    0x4461
+#define GST_MATROSKA_ID_SEGMENTUID 0x73A4
 
 /* ID in the tracks master */
 #define GST_MATROSKA_ID_TRACKENTRY 0xAE

gst/matroska/matroska-mux.c

@@ -114,6 +114,8 @@ GST_STATIC_PAD_TEMPLATE ("subtitle_%d",
     GST_PAD_REQUEST,
     GST_STATIC_CAPS_ANY);
 
+static GArray *used_uids;
+
 /* gobject magic foo */
 static void gst_matroska_mux_base_init (GstMatroskaMuxClass * klass);
 static void gst_matroska_mux_class_init (GstMatroskaMuxClass * klass);
@@ -139,6 +141,9 @@ static void gst_matroska_mux_get_property (GObject * object,
 /* reset muxer */
 static void gst_matroska_mux_reset (GstElement * element);
 
+/* uid generation */
+static guint32 gst_matroska_mux_create_uid ();
+
 static GstEbmlWriteClass *parent_class = NULL;
 
 /*static guint gst_matroska_mux_signals[LAST_SIGNAL] = { 0 };*/
@@ -242,6 +247,28 @@ gst_matroska_mux_init (GstMatroskaMux * mux)
   gst_matroska_mux_reset (GST_ELEMENT (mux));
 }
 
+static guint32
+gst_matroska_mux_create_uid ()
+{
+  guint32 uid = 0;
+  GRand *rand = g_rand_new ();
+
+  while (!uid) {
+    guint i;
+
+    uid = g_rand_int (rand);
+    for (i = 0; i < used_uids->len; i++) {
+      if (g_array_index (used_uids, guint32, i) == uid) {
+        uid = 0;
+        break;
+      }
+    }
+    g_array_append_val (used_uids, uid);
+  }
+  g_free (rand);
+  return uid;
+}
+
 static void
 gst_matroska_mux_reset (GstElement * element)
 {
@@ -289,6 +316,13 @@ gst_matroska_mux_reset (GstElement * element)
   /* reset timers */
   mux->time_scale = 1000000;
   mux->duration = 0;
+
+  /* reset uid array */
+  if (used_uids) {
+    g_free (used_uids);
+  }
+  /* arbitrary size, 10 should be enough in most cases */
+  used_uids = g_array_sized_new (FALSE, FALSE, sizeof (guint32), 10);
 }
 
 static GstPadLinkReturn
@@ -468,6 +502,7 @@ gst_matroska_mux_audio_pad_link (GstPad * pad, const GstCaps * caps)
   audiocontext->samplerate = samplerate;
   audiocontext->channels = channels;
   audiocontext->bitdepth = 0;
+  context->default_duration = 0;
 
   if (!strcmp (mimetype, "audio/mpeg")) {
     gint mpegversion = 0;
@@ -530,6 +565,9 @@ gst_matroska_mux_audio_pad_link (GstPad * pad, const GstCaps * caps)
   } else if (!strcmp (mimetype, "audio/x-raw-tta")) {
     gint width;
 
+    /* TTA frame duration */
+    context->default_duration = 1.04489795918367346939 * GST_SECOND;
+
     gst_structure_get_int (structure, "width", &width);
     audiocontext->bitdepth = width;
     context->codec_id = g_strdup (GST_MATROSKA_CODEC_ID_AUDIO_TTA);
@@ -610,16 +648,19 @@ gst_matroska_mux_track_header (GstMatroskaMux * mux,
   gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKNUMBER, context->num);
   gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKTYPE, context->type);
 
+  gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKUID,
+      gst_matroska_mux_create_uid ());
+  if (context->default_duration) {
+    gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKDEFAULTDURATION,
+        context->default_duration);
+  }
+
   /* type-specific stuff */
   switch (context->type) {
     case GST_MATROSKA_TRACK_TYPE_VIDEO:{
       GstMatroskaTrackVideoContext *videocontext =
           (GstMatroskaTrackVideoContext *) context;
 
-      /* framerate, but not in the video part */
-      gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TRACKDEFAULTDURATION,
-          context->default_duration);
-
       master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_TRACKVIDEO);
       gst_ebml_write_uint (ebml, GST_MATROSKA_ID_VIDEOPIXELWIDTH,
           videocontext->pixel_width);
@@ -697,6 +738,9 @@ gst_matroska_mux_start (GstMatroskaMux * mux)
   gint i;
   guint tracknum = 1;
   gdouble duration = 0;
+  guint32 *segment_uid = (guint32 *) g_malloc (16);
+  GRand *rand = g_rand_new ();
+  GTimeVal time = { 0, 0 };
 
   /* we start with a EBML header */
   gst_ebml_write_header (ebml, "matroska", 1);
@@ -723,6 +767,12 @@ gst_matroska_mux_start (GstMatroskaMux * mux)
   /* segment info */
   mux->info_pos = ebml->pos;
   master = gst_ebml_write_master_start (ebml, GST_MATROSKA_ID_INFO);
+  for (i = 0; i < 4; i++) {
+    segment_uid[i] = g_rand_int (rand);
+  }
+  g_free (rand);
+  gst_ebml_write_binary (ebml, GST_MATROSKA_ID_SEGMENTUID,
+      (guint8 *) segment_uid, 16);
   gst_ebml_write_uint (ebml, GST_MATROSKA_ID_TIMECODESCALE, mux->time_scale);
   mux->duration_pos = ebml->pos;
   /* get duration */
@@ -752,8 +802,8 @@ gst_matroska_mux_start (GstMatroskaMux * mux)
       gst_ebml_write_utf8 (ebml, GST_MATROSKA_ID_WRITINGAPP, app);
     }
   }
-  /* FIXME: how do I get this? Automatic? Via tags? */
+  g_get_current_time (&time);
-  /*gst_ebml_write_date (ebml, GST_MATROSKA_ID_DATEUTC, 0); */
+  gst_ebml_write_date (ebml, GST_MATROSKA_ID_DATEUTC, time.tv_sec);
   gst_ebml_write_master_finish (ebml, master);
 
   /* tracks */
@@ -956,6 +1006,14 @@ gst_matroska_mux_write_data (GstMatroskaMux * mux)
   GST_BUFFER_DATA (hdr)[3] = 0;
   gst_ebml_write_buffer (ebml, hdr);
   gst_ebml_write_buffer (ebml, buf);
+  if (GST_BUFFER_DURATION_IS_VALID (buf)) {
+    guint64 block_duration = GST_BUFFER_DURATION (buf);
+
+    if (block_duration != mux->sink[i].track->default_duration) {
+      gst_ebml_write_uint (ebml, GST_MATROSKA_ID_BLOCKDURATION,
+          block_duration / mux->time_scale);
+    }
+  }
   gst_ebml_write_master_finish (ebml, blockgroup);
   gst_ebml_write_master_finish (ebml, cluster);
 }