From 126efa5e06d1a90f41736b78e746e982bffb980a Mon Sep 17 00:00:00 2001
From: =?utf8?q?Olivier=20Cr=C3=AAte?= <olivier.crete@collabora.co.uk>
Date: Thu, 14 Apr 2011 15:46:08 -0400
Subject: [PATCH] dtmfsrc: Align DTMF sound buffers with last-stop from event

Also make sure the timestamps never go backwards
---
 gst/dtmf/gstdtmfsrc.c | 48 ++++++++++++++++++++++++++++++++++++++----------
 gst/dtmf/gstdtmfsrc.h |  2 ++
 2 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/gst/dtmf/gstdtmfsrc.c b/gst/dtmf/gstdtmfsrc.c
index 79525b5..eb55268 100644
--- a/gst/dtmf/gstdtmfsrc.c
+++ b/gst/dtmf/gstdtmfsrc.c
@@ -323,6 +323,7 @@ gst_dtmf_src_handle_dtmf_event (GstDTMFSrc * dtmfsrc,
   gint event_type;
   gboolean start;
   gint method;
+  GstClockTime last_stop;
 
   if (!gst_structure_get_int (event_structure, "type", &event_type) ||
       !gst_structure_get_boolean (event_structure, "start", &start) ||
@@ -335,6 +336,14 @@ gst_dtmf_src_handle_dtmf_event (GstDTMFSrc * dtmfsrc,
     }
   }
 
+
+  GST_OBJECT_LOCK (dtmfsrc);
+  if (gst_structure_get_clock_time (event_structure, "last-stop", &last_stop))
+    dtmfsrc->last_stop = last_stop;
+  else
+    dtmfsrc->last_stop = GST_CLOCK_TIME_NONE;
+  GST_OBJECT_UNLOCK (dtmfsrc);
+
   if (start) {
     gint event_number;
     gint event_volume;
@@ -447,19 +456,37 @@ gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
 static void
 gst_dtmf_prepare_timestamps (GstDTMFSrc * dtmfsrc)
 {
-  GstClock *clock;
+  GstClockTime last_stop;
+  GstClockTime timestamp;
 
-  clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
-  if (clock != NULL) {
-    dtmfsrc->timestamp = gst_clock_get_time (clock)
-        - gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
-    gst_object_unref (clock);
+  GST_OBJECT_LOCK (dtmfsrc);
+  last_stop = dtmfsrc->last_stop;
+  GST_OBJECT_UNLOCK (dtmfsrc);
+
+  if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
+    timestamp = last_stop;
   } else {
-    gchar *dtmf_name = gst_element_get_name (dtmfsrc);
-    GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
-    dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
-    g_free (dtmf_name);
+    GstClock *clock;
+
+    /* If there is no valid start time, lets use now as the start time */
+
+    clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
+    if (clock != NULL) {
+      timestamp = gst_clock_get_time (clock)
+          - gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
+      gst_object_unref (clock);
+    } else {
+      gchar *dtmf_name = gst_element_get_name (dtmfsrc);
+      GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
+      dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
+      g_free (dtmf_name);
+      return;
+    }
   }
+
+  /* Make sure the timestamp always goes forward */
+  if (timestamp > dtmfsrc->timestamp)
+    dtmfsrc->timestamp = timestamp;
 }
 
 static void
@@ -823,6 +850,7 @@ gst_dtmf_src_change_state (GstElement * element, GstStateChange transition)
         g_slice_free (GstDTMFSrcEvent, event);
         event = g_async_queue_try_pop (dtmfsrc->event_queue);
       }
+      dtmfsrc->timestamp = 0;
       no_preroll = TRUE;
       break;
     default:
diff --git a/gst/dtmf/gstdtmfsrc.h b/gst/dtmf/gstdtmfsrc.h
index aa5d35a6..cda5840 100644
--- a/gst/dtmf/gstdtmfsrc.h
+++ b/gst/dtmf/gstdtmfsrc.h
@@ -81,6 +81,8 @@ struct _GstDTMFSrc
   gboolean paused;
   GstClockID clockid;
 
+  GstClockTime last_stop;
+
   gint sample_rate;
 };
 
-- 
2.7.4