dv1394src: Add a clock based on isochronous cycle counter

Partial fix for #169383.

ext/raw1394/Makefile.am

@@ -1,6 +1,8 @@
 plugin_LTLIBRARIES = libgst1394.la
 
-libgst1394_la_SOURCES = gst1394.c gst1394probe.c gstdv1394src.c gsthdv1394src.c
+libgst1394_la_SOURCES = \
+	gst1394.c gst1394probe.c gstdv1394src.c gsthdv1394src.c \
+	gst1394clock.c
 libgst1394_la_CFLAGS = \
 	$(GST_PLUGINS_BASE_CFLAGS) \
 	$(GST_BASE_CFLAGS) \
@@ -14,4 +16,6 @@ libgst1394_la_LIBADD = \
 libgst1394_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
 libgst1394_la_LIBTOOLFLAGS = --tag=disable-static
 
-noinst_HEADERS = gstdv1394src.h gst1394probe.h gsthdv1394src.h
+noinst_HEADERS = gstdv1394src.h gst1394probe.h gsthdv1394src.h \
+	gst1394clock.h
+

ext/raw1394/gst1394clock.c

@@ -0,0 +1,150 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2000 Wim Taymans <wtay@chello.be>
+ * Copyright (C) 2009      David Schleef <ds@schleef.org>
+ *
+ * gst1394clock.c: Clock for use by IEEE 1394 plugins
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gst1394clock.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_1394_clock_debug);
+#define GST_CAT_DEFAULT gst_1394_clock_debug
+
+static void gst_1394_clock_class_init (Gst1394ClockClass * klass);
+static void gst_1394_clock_init (Gst1394Clock * clock);
+
+static GstClockTime gst_1394_clock_get_internal_time (GstClock * clock);
+
+static GstSystemClockClass *parent_class = NULL;
+
+/* static guint gst_1394_clock_signals[LAST_SIGNAL] = { 0 }; */
+
+GType
+gst_1394_clock_get_type (void)
+{
+  static GType clock_type = 0;
+
+  if (!clock_type) {
+    static const GTypeInfo clock_info = {
+      sizeof (Gst1394ClockClass),
+      NULL,
+      NULL,
+      (GClassInitFunc) gst_1394_clock_class_init,
+      NULL,
+      NULL,
+      sizeof (Gst1394Clock),
+      4,
+      (GInstanceInitFunc) gst_1394_clock_init,
+      NULL
+    };
+
+    clock_type = g_type_register_static (GST_TYPE_SYSTEM_CLOCK, "Gst1394Clock",
+        &clock_info, 0);
+  }
+  return clock_type;
+}
+
+
+static void
+gst_1394_clock_class_init (Gst1394ClockClass * klass)
+{
+  GstClockClass *gstclock_class;
+
+  gstclock_class = (GstClockClass *) klass;
+
+  parent_class = g_type_class_peek_parent (klass);
+
+  gstclock_class->get_internal_time = gst_1394_clock_get_internal_time;
+
+  GST_DEBUG_CATEGORY_INIT (gst_1394_clock_debug, "1394clock", 0, "1394clock");
+}
+
+static void
+gst_1394_clock_init (Gst1394Clock * clock)
+{
+  clock->last_time = 0;
+  GST_OBJECT_FLAG_SET (clock, GST_CLOCK_FLAG_CAN_SET_MASTER);
+}
+
+/**
+ * gst_1394_clock_new:
+ * @name: the name of the clock
+ *
+ * Create a new #Gst1394Clock instance.
+ *
+ * Returns: a new #Gst1394Clock
+ */
+Gst1394Clock *
+gst_1394_clock_new (const gchar * name)
+{
+  Gst1394Clock *_1394clock =
+      GST_1394_CLOCK (g_object_new (GST_TYPE_1394_CLOCK, "name", name, NULL));
+
+  return _1394clock;
+}
+
+static GstClockTime
+gst_1394_clock_get_internal_time (GstClock * clock)
+{
+  Gst1394Clock *_1394clock;
+  GstClockTime result;
+  guint32 cycle_timer;
+  guint64 local_time;
+
+  _1394clock = GST_1394_CLOCK_CAST (clock);
+
+  if (_1394clock->handle != NULL) {
+    raw1394_read_cycle_timer (_1394clock->handle, &cycle_timer, &local_time);
+
+    if (cycle_timer < _1394clock->cycle_timer_lo) {
+      GST_LOG_OBJECT (clock, "overflow %u to %u",
+          _1394clock->cycle_timer_lo, cycle_timer);
+
+      _1394clock->cycle_timer_hi++;
+    }
+    _1394clock->cycle_timer_lo = cycle_timer;
+
+    result = (((guint64) _1394clock->cycle_timer_hi) << 32) | cycle_timer;
+    result *= 40;
+
+    GST_LOG_OBJECT (clock, "result %lld", result);
+  } else {
+    result = GST_CLOCK_TIME_NONE;
+  }
+
+  return result;
+}
+
+void
+gst_1394_clock_set_handle (Gst1394Clock * clock, raw1394handle_t handle)
+{
+  clock->handle = handle;
+  clock->cycle_timer_lo = 0;
+  clock->cycle_timer_hi = 0;
+}
+
+void
+gst_1394_clock_unset_handle (Gst1394Clock * clock)
+{
+  clock->handle = NULL;
+}

ext/raw1394/gst1394clock.h

@@ -0,0 +1,81 @@
+/* GStreamer
+ * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
+ *                    2005 Wim Taymans <wim@fluendo.com>
+ * Copyright (C) 2009      David Schleef <ds@schleef.org>
+ *
+ * gst1394clock.h: Clock for use by the IEEE 1394
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __GST_1394_CLOCK_H__
+#define __GST_1394_CLOCK_H__
+
+#include <gst/gst.h>
+#include <gst/gstsystemclock.h>
+
+#include <libraw1394/raw1394.h>
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_1394_CLOCK \
+  (gst_1394_clock_get_type())
+#define GST_1394_CLOCK(obj) \
+  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_1394_CLOCK,Gst1394Clock))
+#define GST_1394_CLOCK_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_1394_CLOCK,Gst1394ClockClass))
+#define GST_IS_1394_CLOCK(obj) \
+  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_1394_CLOCK))
+#define GST_IS_1394_CLOCK_CLASS(klass) \
+  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_1394_CLOCK))
+#define GST_1394_CLOCK_CAST(obj) \
+  ((Gst1394Clock*)(obj))
+
+typedef struct _Gst1394Clock Gst1394Clock;
+typedef struct _Gst1394ClockClass Gst1394ClockClass;
+
+/**
+ * Gst1394Clock:
+ * @clock: parent #GstSystemClock
+ *
+ * Opaque #Gst1394Clock.
+ */
+struct _Gst1394Clock {
+  GstSystemClock clock;
+
+  raw1394handle_t handle;
+
+  GstClockTime last_time;
+  guint32 cycle_timer_lo;
+  guint32 cycle_timer_hi;
+};
+
+struct _Gst1394ClockClass {
+  GstSystemClockClass parent_class;
+
+  /*< private >*/
+  gpointer _gst_reserved[GST_PADDING];
+};
+
+GType           gst_1394_clock_get_type        (void);
+Gst1394Clock*   gst_1394_clock_new             (const gchar *name);
+void            gst_1394_clock_set_handle      (Gst1394Clock *clock,
+    raw1394handle_t handle);
+void            gst_1394_clock_unset_handle      (Gst1394Clock *clock);
+
+G_END_DECLS
+
+#endif /* __GST_1394_CLOCK_H__ */

ext/raw1394/gstdv1394src.c

@@ -56,6 +56,7 @@
 
 #include "gstdv1394src.h"
 #include "gst1394probe.h"
+#include "gst1394clock.h"
 
 
 #define CONTROL_STOP            'S'     /* stop the select call */
@@ -136,6 +137,8 @@ static void gst_dv1394src_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec);
 static void gst_dv1394src_dispose (GObject * object);
 
+static GstClock *gst_dv1394src_provide_clock (GstElement * element);
+
 static gboolean gst_dv1394src_start (GstBaseSrc * bsrc);
 static gboolean gst_dv1394src_stop (GstBaseSrc * bsrc);
 static gboolean gst_dv1394src_unlock (GstBaseSrc * bsrc);
@@ -183,10 +186,12 @@ static void
 gst_dv1394src_class_init (GstDV1394SrcClass * klass)
 {
   GObjectClass *gobject_class;
+  GstElementClass *gstelement_class;
   GstBaseSrcClass *gstbasesrc_class;
   GstPushSrcClass *gstpushsrc_class;
 
   gobject_class = (GObjectClass *) klass;
+  gstelement_class = (GstElementClass *) klass;
   gstbasesrc_class = (GstBaseSrcClass *) klass;
   gstpushsrc_class = (GstPushSrcClass *) klass;
 
@@ -194,6 +199,8 @@ gst_dv1394src_class_init (GstDV1394SrcClass * klass)
   gobject_class->get_property = gst_dv1394src_get_property;
   gobject_class->dispose = gst_dv1394src_dispose;
 
+  gstelement_class->provide_clock = gst_dv1394src_provide_clock;
+
   gst_dv1394src_signals[SIGNAL_FRAME_DROPPED] =
       g_signal_new ("frame-dropped", G_TYPE_FROM_CLASS (klass),
       G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstDV1394SrcClass, frame_dropped),
@@ -274,6 +281,8 @@ gst_dv1394src_init (GstDV1394Src * dv1394src, GstDV1394SrcClass * klass)
   dv1394src->buf = NULL;
   dv1394src->frame = NULL;
   dv1394src->frame_sequence = 0;
+
+  dv1394src->provided_clock = gst_1394_clock_new ("dv1394clock");
 }
 
 static void
@@ -281,6 +290,10 @@ gst_dv1394src_dispose (GObject * object)
 {
   GstDV1394Src *src = GST_DV1394SRC (object);
 
+  if (src->provided_clock) {
+    g_object_unref (src->provided_clock);
+  }
+
   g_free (src->uri);
   src->uri = NULL;
 
@@ -363,6 +376,14 @@ gst_dv1394src_get_property (GObject * object, guint prop_id, GValue * value,
   }
 }
 
+static GstClock *
+gst_dv1394src_provide_clock (GstElement * element)
+{
+  GstDV1394Src *dv1394src = GST_DV1394SRC (element);
+
+  return GST_CLOCK_CAST (gst_object_ref (dv1394src->provided_clock));
+}
+
 #ifdef HAVE_LIBIEC61883
 static GstDV1394Src *
 gst_dv1394src_from_raw1394handle (raw1394handle_t handle)
@@ -833,6 +854,8 @@ gst_dv1394src_start (GstBaseSrc * bsrc)
     }
   }
 
+  gst_1394_clock_set_handle (src->provided_clock, src->handle);
+
   return TRUE;
 
 socket_pair:
@@ -927,6 +950,8 @@ gst_dv1394src_stop (GstBaseSrc * bsrc)
     }
   }
 
+  gst_1394_clock_unset_handle (src->provided_clock);
+
   raw1394_destroy_handle (src->handle);
 
   return TRUE;

ext/raw1394/gstdv1394src.h

@@ -24,6 +24,7 @@
 
 #include <gst/gst.h>
 #include <gst/base/gstpushsrc.h>
+#include "gst1394clock.h"
 
 #include <libraw1394/raw1394.h>
 #ifdef HAVE_LIBIEC61883
@@ -82,6 +83,8 @@ struct _GstDV1394Src {
   #ifdef HAVE_LIBIEC61883
   iec61883_dv_fb_t iec61883dv;
   #endif
+
+  Gst1394Clock *provided_clock;
 };
 
 struct _GstDV1394SrcClass {