Add camerabin element.

1 files changed, 826 insertions, 0 deletions

diff --git a/gst/camerabin/camerabinvideo.c b/gst/camerabin/camerabinvideo.c
new file mode 100644
index 00000000..14a95064
--- /dev/null
+++ b/gst/camerabin/camerabinvideo.c
@@ -0,0 +1,826 @@
+/*
+ * GStreamer
+ * Copyright (C) 2008 Nokia Corporation <multimedia@maemo.org>
+ *
+ * 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.
+ */
+
+/**
+ * SECTION:camerabinvideo
+ * @short_description: video recording module of #GstCameraBin
+ *
+ * <refsect2>
+ * <para>
+ *
+ * The pipeline for this module is:
+ *
+ * <informalexample>
+ * <programlisting>
+ *-----------------------------------------------------------------------------
+ * audiosrc -> audio_queue -> audioconvert -> volume -> audioenc
+ *                                                       > videomux -> filesink
+ *                       video_queue -> [timeoverlay] -> videoenc
+ * -> [post proc] -> tee <
+ *                       queue ->
+ *-----------------------------------------------------------------------------
+ * </programlisting>
+ * </informalexample>
+ *
+ * The properties of elements are:
+ *
+ * queue - "leaky", 2 (Leaky on downstream (old buffers))
+ *
+ * </para>
+ * </refsect2>
+ */
+
+/*
+ * includes
+ */
+
+
+#include <gst/gst.h>
+#include "camerabingeneral.h"
+
+#include "camerabinvideo.h"
+
+/*
+ * defines and static global vars
+ */
+
+/* internal element names */
+
+#define DEFAULT_AUD_SRC "pulsesrc"
+#define DEFAULT_AUD_ENC "vorbisenc"
+#define DEFAULT_VID_ENC "theoraenc"
+#define DEFAULT_MUX "oggmux"
+#define DEFAULT_SINK "filesink"
+
+#define USE_AUDIO_CONVERSION 1
+
+enum
+{
+  PROP_0,
+  PROP_FILENAME
+};
+
+static void gst_camerabin_video_dispose (GstCameraBinVideo * sink);
+static void gst_camerabin_video_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_camerabin_video_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static GstClock *gst_camerabin_video_provide_clock (GstElement * elem);
+static GstStateChangeReturn
+gst_camerabin_video_change_state (GstElement * element,
+    GstStateChange transition);
+
+static
+    gboolean camerabin_video_pad_tee_src0_have_buffer (GstPad * pad,
+    GstBuffer * buffer, gpointer u_data);
+static gboolean camerabin_video_pad_aud_src_have_buffer (GstPad * pad,
+    GstBuffer * buffer, gpointer u_data);
+static gboolean camerabin_video_sink_have_event (GstPad * pad, GstEvent * event,
+    gpointer u_data);
+static gboolean gst_camerabin_video_create_elements (GstCameraBinVideo * vid);
+static void gst_camerabin_video_destroy_elements (GstCameraBinVideo * vid);
+
+GST_BOILERPLATE (GstCameraBinVideo, gst_camerabin_video, GstBin, GST_TYPE_BIN);
+
+static const GstElementDetails gst_camerabin_video_details =
+GST_ELEMENT_DETAILS ("Video capture bin for camerabin",
+    "Bin/Video",
+    "Process and store video data",
+    "Edgard Lima <edgard.lima@indt.org.br>\n"
+    "Nokia Corporation <multimedia@maemo.org>");
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS_ANY);
+
+
+/* GObject methods implementation */
+
+static void
+gst_camerabin_video_base_init (gpointer klass)
+{
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (eklass,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_add_pad_template (eklass,
+      gst_static_pad_template_get (&src_template));
+  gst_element_class_set_details (eklass, &gst_camerabin_video_details);
+}
+
+static void
+gst_camerabin_video_class_init (GstCameraBinVideoClass * klass)
+{
+  GObjectClass *gobject_class;
+  GstElementClass *eklass = GST_ELEMENT_CLASS (klass);
+
+  gobject_class = G_OBJECT_CLASS (klass);
+  gobject_class->dispose =
+      (GObjectFinalizeFunc) GST_DEBUG_FUNCPTR (gst_camerabin_video_dispose);
+  eklass->change_state = GST_DEBUG_FUNCPTR (gst_camerabin_video_change_state);
+
+  eklass->provide_clock = GST_DEBUG_FUNCPTR (gst_camerabin_video_provide_clock);
+
+  gobject_class->set_property =
+      GST_DEBUG_FUNCPTR (gst_camerabin_video_set_property);
+  gobject_class->get_property =
+      GST_DEBUG_FUNCPTR (gst_camerabin_video_get_property);
+
+  /**
+   * GstCameraBinVideo:filename:
+   *
+   * This property can be used to specify the filename of the video.
+   *
+   **/
+  g_object_class_install_property (gobject_class, PROP_FILENAME,
+      g_param_spec_string ("filename", "Filename",
+          "Filename of the video to save", NULL, G_PARAM_READWRITE));
+}
+
+static void
+gst_camerabin_video_init (GstCameraBinVideo * vid,
+    GstCameraBinVideoClass * g_class)
+{
+  vid->filename = g_string_new ("");
+
+  vid->user_post = NULL;
+  vid->user_vid_enc = NULL;
+  vid->user_aud_enc = NULL;
+  vid->user_aud_src = NULL;
+  vid->user_mux = NULL;
+
+  vid->aud_src = NULL;
+  vid->sink = NULL;
+  vid->tee = NULL;
+  vid->volume = NULL;
+  vid->video_queue = NULL;
+
+  vid->tee_video_srcpad = NULL;
+  vid->tee_vf_srcpad = NULL;
+
+  vid->pending_eos = NULL;
+
+  /* Create src and sink ghost pads */
+  vid->sinkpad = gst_ghost_pad_new_no_target ("sink", GST_PAD_SINK);
+  gst_element_add_pad (GST_ELEMENT (vid), vid->sinkpad);
+
+  vid->srcpad = gst_ghost_pad_new_no_target ("src", GST_PAD_SRC);
+  gst_element_add_pad (GST_ELEMENT (vid), vid->srcpad);
+
+  /* Add probe for handling eos when stopping recording */
+  gst_pad_add_event_probe (vid->sinkpad,
+      G_CALLBACK (camerabin_video_sink_have_event), vid);
+}
+
+static void
+gst_camerabin_video_dispose (GstCameraBinVideo * vid)
+{
+  GST_DEBUG_OBJECT (vid, "disposing");
+
+  g_string_free (vid->filename, TRUE);
+  vid->filename = NULL;
+
+  if (vid->user_post) {
+    gst_object_unref (vid->user_post);
+    vid->user_post = NULL;
+  }
+
+  if (vid->user_vid_enc) {
+    gst_object_unref (vid->user_vid_enc);
+    vid->user_vid_enc = NULL;
+  }
+
+  if (vid->user_aud_enc) {
+    gst_object_unref (vid->user_aud_enc);
+    vid->user_aud_enc = NULL;
+  }
+
+  if (vid->user_aud_src) {
+    gst_object_unref (vid->user_aud_src);
+    vid->user_aud_src = NULL;
+  }
+
+  if (vid->user_mux) {
+    gst_object_unref (vid->user_mux);
+    vid->user_mux = NULL;
+  }
+
+  G_OBJECT_CLASS (parent_class)->dispose ((GObject *) vid);
+}
+
+
+static void
+gst_camerabin_video_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstCameraBinVideo *bin = GST_CAMERABIN_VIDEO (object);
+
+  switch (prop_id) {
+    case PROP_FILENAME:
+      g_string_assign (bin->filename, g_value_get_string (value));
+      if (bin->sink) {
+        g_object_set (G_OBJECT (bin->sink), "location", bin->filename->str,
+            NULL);
+      } else {
+        GST_INFO ("no sink, not setting name yet");
+      }
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_camerabin_video_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstCameraBinVideo *bin = GST_CAMERABIN_VIDEO (object);
+
+  switch (prop_id) {
+    case PROP_FILENAME:
+      g_value_set_string (value, bin->filename->str);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+/* GstElement methods implementation */
+
+static GstClock *
+gst_camerabin_video_provide_clock (GstElement * elem)
+{
+  GstElement *aud_src = GST_CAMERABIN_VIDEO (elem)->aud_src;
+  if (aud_src) {
+    return gst_element_provide_clock (aud_src);
+  } else {
+    return NULL;
+  }
+}
+
+static GstStateChangeReturn
+gst_camerabin_video_change_state (GstElement * element,
+    GstStateChange transition)
+{
+  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
+  GstCameraBinVideo *vid = GST_CAMERABIN_VIDEO (element);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_NULL_TO_READY:
+      if (!gst_camerabin_video_create_elements (vid)) {
+        return GST_STATE_CHANGE_FAILURE;
+      }
+      /* Don't change sink to READY yet to allow changing the
+         filename in READY state. */
+      gst_element_set_locked_state (vid->sink, TRUE);
+      break;
+    case GST_STATE_CHANGE_READY_TO_PAUSED:
+      vid->calculate_adjust_ts_video = TRUE;
+      vid->calculate_adjust_ts_aud = TRUE;
+      g_object_set (G_OBJECT (vid->sink), "async", FALSE, NULL);
+      gst_element_set_locked_state (vid->sink, FALSE);
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+      vid->calculate_adjust_ts_video = TRUE;
+      vid->calculate_adjust_ts_aud = TRUE;
+      break;
+
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      /* Set sink to NULL in order to write the file _now_ */
+      GST_INFO ("write vid file: %s", vid->filename->str);
+      gst_element_set_locked_state (vid->sink, TRUE);
+      gst_element_set_state (vid->sink, GST_STATE_NULL);
+      break;
+    default:
+      break;
+  }
+
+  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+  switch (transition) {
+    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
+      if (vid->pending_eos) {
+        /* Video bin is still paused, so push eos directly to video queue */
+        GST_DEBUG_OBJECT (vid, "pushing pending eos");
+        gst_pad_push_event (vid->tee_video_srcpad, vid->pending_eos);
+        vid->pending_eos = NULL;
+      }
+      break;
+    case GST_STATE_CHANGE_PAUSED_TO_READY:
+      /* Reset counters related to timestamp rewriting */
+      vid->adjust_ts_video = 0;
+      vid->last_ts_video = 0;
+      vid->adjust_ts_aud = 0;
+      vid->last_ts_aud = 0;
+
+      if (vid->pending_eos) {
+        gst_event_unref (vid->pending_eos);
+        vid->pending_eos = NULL;
+      }
+      break;
+    case GST_STATE_CHANGE_READY_TO_NULL:
+      gst_camerabin_video_destroy_elements (vid);
+      break;
+    default:
+      break;
+  }
+
+  return ret;
+}
+
+/*
+ * static helper functions implementation
+ */
+
+/**
+ * camerabin_video_pad_tee_src0_have_buffer:
+ * @pad: tee src pad leading to video encoding
+ * @event: received buffer
+ * @u_data: video bin object
+ *
+ * Buffer probe for rewriting video buffer timestamps.
+ *
+ * Returns: TRUE always
+ */
+static gboolean
+camerabin_video_pad_tee_src0_have_buffer (GstPad * pad, GstBuffer * buffer,
+    gpointer u_data)
+{
+  GstCameraBinVideo *vid = (GstCameraBinVideo *) u_data;
+
+  GST_LOG ("buffer in with size %d ts %" GST_TIME_FORMAT,
+      GST_BUFFER_SIZE (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
+
+  if (G_UNLIKELY (vid->calculate_adjust_ts_video)) {
+    GstEvent *event;
+    GstObject *tee;
+    GstPad *sinkpad;
+    vid->adjust_ts_video = GST_BUFFER_TIMESTAMP (buffer) - vid->last_ts_video;
+    vid->calculate_adjust_ts_video = FALSE;
+    event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
+        0, GST_CLOCK_TIME_NONE, vid->last_ts_video);
+    /* Send the newsegment to both view finder and video bin */
+    tee = gst_pad_get_parent (pad);
+    sinkpad = gst_element_get_static_pad (GST_ELEMENT (tee), "sink");
+    gst_pad_send_event (sinkpad, event);
+    gst_object_unref (tee);
+    gst_object_unref (sinkpad);
+    GST_LOG_OBJECT (vid, "vid ts adjustment: %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (vid->adjust_ts_video));
+    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
+  }
+  GST_BUFFER_TIMESTAMP (buffer) -= vid->adjust_ts_video;
+  vid->last_ts_video = GST_BUFFER_TIMESTAMP (buffer);
+  if (GST_BUFFER_DURATION_IS_VALID (buffer))
+    vid->last_ts_video += GST_BUFFER_DURATION (buffer);
+
+
+  GST_LOG ("buffer out with size %d ts %" GST_TIME_FORMAT,
+      GST_BUFFER_SIZE (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
+  return TRUE;
+}
+
+/**
+ * camerabin_video_pad_aud_src_have_buffer:
+ * @pad: audio source src pad
+ * @event: received buffer
+ * @u_data: video bin object
+ *
+ * Buffer probe for rewriting audio buffer timestamps.
+ *
+ * Returns: TRUE always
+ */
+static gboolean
+camerabin_video_pad_aud_src_have_buffer (GstPad * pad, GstBuffer * buffer,
+    gpointer u_data)
+{
+  GstCameraBinVideo *vid = (GstCameraBinVideo *) u_data;
+
+  if (vid->calculate_adjust_ts_aud) {
+    GstEvent *event;
+    GstPad *peerpad = NULL;
+    vid->adjust_ts_aud = GST_BUFFER_TIMESTAMP (buffer) - vid->last_ts_aud;
+    vid->calculate_adjust_ts_aud = FALSE;
+    event = gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_TIME,
+        0, GST_CLOCK_TIME_NONE, vid->last_ts_aud);
+    peerpad = gst_pad_get_peer (pad);
+    if (peerpad) {
+      gst_pad_send_event (peerpad, event);
+      gst_object_unref (peerpad);
+    }
+    GST_LOG_OBJECT (vid, "aud ts adjustment: %" GST_TIME_FORMAT,
+        GST_TIME_ARGS (vid->adjust_ts_aud));
+    GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
+  }
+  GST_BUFFER_TIMESTAMP (buffer) -= vid->adjust_ts_aud;
+  vid->last_ts_aud = GST_BUFFER_TIMESTAMP (buffer);
+  if (GST_BUFFER_DURATION_IS_VALID (buffer))
+    vid->last_ts_aud += GST_BUFFER_DURATION (buffer);
+  GST_LOG ("buffer out with size %d ts %" GST_TIME_FORMAT,
+      GST_BUFFER_SIZE (buffer), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
+  return TRUE;
+}
+
+/**
+ * camerabin_video_sink_have_event:
+ * @pad: video bin sink pad
+ * @event: received event
+ * @u_data: video bin object
+ *
+ * Event probe for video bin eos handling.
+ * Copies the eos event to audio branch of video bin.
+ *
+ * Returns: FALSE to drop the event, TRUE otherwise
+ */
+static gboolean
+camerabin_video_sink_have_event (GstPad * pad, GstEvent * event,
+    gpointer u_data)
+{
+  GstCameraBinVideo *vid = (GstCameraBinVideo *) u_data;
+  gboolean ret = TRUE;
+
+  GST_DEBUG_OBJECT (vid, "got videobin sink event: %s",
+      GST_EVENT_TYPE_NAME (event));
+
+  switch (GST_EVENT_TYPE (event)) {
+    case GST_EVENT_EOS:
+      if (vid->aud_src) {
+        GST_DEBUG_OBJECT (vid, "copying %s to audio branch",
+            GST_EVENT_TYPE_NAME (event));
+        gst_element_send_event (vid->aud_src, gst_event_copy (event));
+      }
+
+      /* If we're paused, we can't pass eos to video now to avoid blocking.
+         Instead send eos when changing to playing next time. */
+      if (GST_STATE (GST_ELEMENT (vid)) == GST_STATE_PAUSED) {
+        GST_DEBUG_OBJECT (vid, "paused, delay eos sending");
+        vid->pending_eos = gst_event_ref (event);
+        ret = FALSE;            /* Drop the event */
+      }
+      break;
+    default:
+      break;
+  }
+  return ret;
+}
+
+/**
+ * gst_camerabin_video_create_elements:
+ * @vid: a pointer to #GstCameraBinVideo
+ *
+ * This function creates the needed #GstElements and resources to record videos.
+ * Use gst_camerabin_video_destroy_elements() to free these resources.
+ *
+ * Returns: %TRUE if succeeded or FALSE if failed
+ */
+static gboolean
+gst_camerabin_video_create_elements (GstCameraBinVideo * vid)
+{
+  GstPad *pad = NULL, *vid_sinkpad = NULL, *vid_srcpad = NULL;
+  GstBin *vidbin = GST_BIN (vid);
+  GstElement *queue = NULL;
+
+  vid->adjust_ts_video = 0;
+  vid->last_ts_video = 0;
+  vid->calculate_adjust_ts_video = FALSE;
+
+  vid->adjust_ts_aud = 0;
+  vid->last_ts_aud = 0;
+  vid->calculate_adjust_ts_aud = FALSE;
+
+  /* Add video post processing element if any */
+  if (vid->user_post) {
+    if (!gst_camerabin_add_element (vidbin, vid->user_post)) {
+      goto error;
+    }
+    vid_sinkpad = gst_element_get_static_pad (vid->user_post, "sink");
+  }
+
+  /* Add tee element */
+  if (!(vid->tee = gst_camerabin_create_and_add_element (vidbin, "tee"))) {
+    goto error;
+  }
+
+  /* Set up sink ghost pad for video bin */
+  if (!vid_sinkpad) {
+    vid_sinkpad = gst_element_get_static_pad (vid->tee, "sink");
+  }
+  gst_ghost_pad_set_target (GST_GHOST_PAD (vid->sinkpad), vid_sinkpad);
+
+
+  /* Add queue element for video */
+  vid->tee_video_srcpad = gst_element_get_request_pad (vid->tee, "src%d");
+  if (!(vid->video_queue =
+          gst_camerabin_create_and_add_element (vidbin, "queue"))) {
+    goto error;
+  }
+
+  /* Add probe for rewriting video timestamps */
+  gst_pad_add_buffer_probe (vid->tee_video_srcpad,
+      G_CALLBACK (camerabin_video_pad_tee_src0_have_buffer), vid);
+
+
+#ifdef USE_TIMEOVERLAY
+  /* Add timeoverlay element to visualize elapsed time for debugging */
+  if (!(gst_camerabin_create_and_add_element (vidbin, "timeoverlay"))) {
+    goto error;
+  }
+#endif
+
+  /* Add user set or default video encoder element */
+  if (vid->user_vid_enc) {
+    vid->vid_enc = vid->user_vid_enc;
+    if (!gst_camerabin_add_element (vidbin, vid->vid_enc)) {
+      goto error;
+    }
+  } else if (!(vid->vid_enc =
+          gst_camerabin_create_and_add_element (vidbin, DEFAULT_VID_ENC))) {
+    goto error;
+  }
+
+  /* Add user set or default muxer element */
+  if (vid->user_mux) {
+    vid->muxer = vid->user_mux;
+    if (!gst_camerabin_add_element (vidbin, vid->muxer)) {
+      goto error;
+    }
+  } else if (!(vid->muxer =
+          gst_camerabin_create_and_add_element (vidbin, DEFAULT_MUX))) {
+    goto error;
+  }
+
+  /* Add sink element for storing the video */
+  if (!(vid->sink =
+          gst_camerabin_create_and_add_element (vidbin, DEFAULT_SINK))) {
+    goto error;
+  }
+  g_object_set (G_OBJECT (vid->sink), "location", vid->filename->str, NULL);
+
+
+  /* Add user set or default audio source element */
+  if (vid->user_aud_src) {
+    vid->aud_src = vid->user_aud_src;
+    if (!gst_camerabin_add_element (vidbin, vid->aud_src)) {
+      goto error;
+    }
+  } else if (!(vid->aud_src =
+          gst_camerabin_create_and_add_element (vidbin, DEFAULT_AUD_SRC))) {
+    goto error;
+  }
+
+  /* Add queue element for audio */
+  if (!(queue = gst_camerabin_create_and_add_element (vidbin, "queue"))) {
+    goto error;
+  }
+  queue = NULL;
+
+  /* Add optional audio conversion and volume elements and
+     raise no errors if adding them fails */
+#ifdef USE_AUDIO_CONVERSION
+  if (!gst_camerabin_try_add_element (vidbin,
+          gst_element_factory_make ("audioconvert", NULL))) {
+    GST_WARNING_OBJECT (vid, "unable to add audio conversion element");
+    /* gst_camerabin_try_add_element() destroyed the element */
+  }
+#endif
+  vid->volume = gst_element_factory_make ("volume", NULL);
+  if (!gst_camerabin_try_add_element (vidbin, vid->volume)) {
+    GST_WARNING_OBJECT (vid, "unable to add volume element");
+    /* gst_camerabin_try_add_element() destroyed the element */
+    vid->volume = NULL;
+  }
+
+  /* Add user set or default audio encoder element */
+  if (vid->user_aud_enc) {
+    vid->aud_enc = vid->user_aud_enc;
+    if (!gst_camerabin_add_element (vidbin, vid->aud_enc)) {
+      goto error;
+    }
+  } else if (!(vid->aud_enc =
+          gst_camerabin_create_and_add_element (vidbin, DEFAULT_AUD_ENC))) {
+    goto error;
+  }
+
+  /* Link audio part to the muxer */
+  if (!gst_element_link (vid->aud_enc, vid->muxer)) {
+    GST_ELEMENT_ERROR (vid, CORE, NEGOTIATION, (NULL),
+        ("linking audio encoder and muxer failed"));
+    goto error;
+  }
+
+  /* Add queue leading out of the video bin and to view finder */
+  vid->tee_vf_srcpad = gst_element_get_request_pad (vid->tee, "src%d");
+  if (!(queue = gst_camerabin_create_and_add_element (vidbin, "queue"))) {
+    goto error;
+  }
+  /* Set queue leaky, we don't want to block video encoder feed, but
+     prefer leaking view finder buffers instead. */
+  g_object_set (G_OBJECT (queue), "leaky", 2, NULL);
+
+  /* Set up src ghost pad for video bin */
+  vid_srcpad = gst_element_get_static_pad (queue, "src");
+  gst_ghost_pad_set_target (GST_GHOST_PAD (vid->srcpad), vid_srcpad);
+  /* Never let video bin eos events reach view finder */
+  gst_pad_add_event_probe (vid_srcpad,
+      G_CALLBACK (gst_camerabin_drop_eos_probe), vid);
+
+  pad = gst_element_get_static_pad (vid->aud_src, "src");
+  gst_pad_add_buffer_probe (pad,
+      G_CALLBACK (camerabin_video_pad_aud_src_have_buffer), vid);
+  gst_object_unref (pad);
+
+  GST_DEBUG ("created video elements");
+
+  return TRUE;
+
+error:
+
+  gst_camerabin_video_destroy_elements (vid);
+
+  return FALSE;
+
+}
+
+/**
+ * gst_camerabin_video_destroy_elements:
+ * @vid: a pointer to #GstCameraBinVideo
+ *
+ * This function destroys all the elements created by
+ * gst_camerabin_video_create_elements().
+ *
+ */
+static void
+gst_camerabin_video_destroy_elements (GstCameraBinVideo * vid)
+{
+  GST_DEBUG ("destroying video elements");
+
+  /* Release tee request pads */
+  if (vid->tee_video_srcpad) {
+    gst_element_release_request_pad (vid->tee, vid->tee_video_srcpad);
+    vid->tee_video_srcpad = NULL;
+  }
+  if (vid->tee_vf_srcpad) {
+    gst_element_release_request_pad (vid->tee, vid->tee_vf_srcpad);
+    vid->tee_vf_srcpad = NULL;
+  }
+
+  gst_ghost_pad_set_target (GST_GHOST_PAD (vid->sinkpad), NULL);
+  gst_ghost_pad_set_target (GST_GHOST_PAD (vid->srcpad), NULL);
+
+  gst_camerabin_remove_elements_from_bin (GST_BIN (vid));
+
+  vid->aud_src = NULL;
+  vid->sink = NULL;
+  vid->tee = NULL;
+  vid->volume = NULL;
+  vid->video_queue = NULL;
+  vid->vid_enc = NULL;
+  vid->aud_enc = NULL;
+  vid->muxer = NULL;
+
+  if (vid->pending_eos) {
+    gst_event_unref (vid->pending_eos);
+    vid->pending_eos = NULL;
+  }
+
+  return;
+}
+
+/*
+ * Set & get mute and video capture elements
+ */
+
+void
+gst_camerabin_video_set_mute (GstCameraBinVideo * vid, gboolean mute)
+{
+  if (vid && vid->volume) {
+    GST_DEBUG_OBJECT (vid, "setting mute %s", mute ? "on" : "off");
+    g_object_set (vid->volume, "mute", mute, NULL);
+  }
+}
+
+void
+gst_camerabin_video_set_post (GstCameraBinVideo * vid, GstElement * post)
+{
+  GstElement **user_post;
+  GST_DEBUG_OBJECT (vid, "setting video post processing: %" GST_PTR_FORMAT,
+      post);
+  GST_OBJECT_LOCK (vid);
+  user_post = &vid->user_post;
+  gst_object_replace ((GstObject **) user_post, GST_OBJECT (post));
+  GST_OBJECT_UNLOCK (vid);
+}
+
+void
+gst_camerabin_video_set_video_enc (GstCameraBinVideo * vid,
+    GstElement * video_enc)
+{
+  GstElement **user_vid_enc;
+  GST_DEBUG_OBJECT (vid, "setting video encoder: %" GST_PTR_FORMAT, video_enc);
+  GST_OBJECT_LOCK (vid);
+  user_vid_enc = &vid->user_vid_enc;
+  gst_object_replace ((GstObject **) user_vid_enc, GST_OBJECT (video_enc));
+  GST_OBJECT_UNLOCK (vid);
+}
+
+void
+gst_camerabin_video_set_audio_enc (GstCameraBinVideo * vid,
+    GstElement * audio_enc)
+{
+  GstElement **user_aud_enc;
+  GST_DEBUG_OBJECT (vid, "setting audio encoder: %" GST_PTR_FORMAT, audio_enc);
+  GST_OBJECT_LOCK (vid);
+  user_aud_enc = &vid->user_aud_enc;
+  gst_object_replace ((GstObject **) user_aud_enc, GST_OBJECT (audio_enc));
+  GST_OBJECT_UNLOCK (vid);
+}
+
+void
+gst_camerabin_video_set_muxer (GstCameraBinVideo * vid, GstElement * muxer)
+{
+  GstElement **user_mux;
+  GST_DEBUG_OBJECT (vid, "setting muxer: %" GST_PTR_FORMAT, muxer);
+  GST_OBJECT_LOCK (vid);
+  user_mux = &vid->user_mux;
+  gst_object_replace ((GstObject **) user_mux, GST_OBJECT (muxer));
+  GST_OBJECT_UNLOCK (vid);
+}
+
+void
+gst_camerabin_video_set_audio_src (GstCameraBinVideo * vid,
+    GstElement * audio_src)
+{
+  GstElement **user_aud_src;
+  GST_DEBUG_OBJECT (vid, "setting audio source: %" GST_PTR_FORMAT, audio_src);
+  GST_OBJECT_LOCK (vid);
+  user_aud_src = &vid->user_aud_src;
+  gst_object_replace ((GstObject **) user_aud_src, GST_OBJECT (audio_src));
+  GST_OBJECT_UNLOCK (vid);
+}
+
+gboolean
+gst_camerabin_video_get_mute (GstCameraBinVideo * vid)
+{
+  gboolean mute = ARG_DEFAULT_MUTE;
+
+  if (vid && vid->volume) {
+    g_object_get (vid->volume, "mute", &mute, NULL);
+  }
+  return mute;
+}
+
+GstElement *
+gst_camerabin_video_get_post (GstCameraBinVideo * vid)
+{
+  return vid->user_post;
+}
+
+GstElement *
+gst_camerabin_video_get_video_enc (GstCameraBinVideo * vid)
+{
+  return vid->vid_enc ? vid->vid_enc : vid->user_vid_enc;
+}
+
+GstElement *
+gst_camerabin_video_get_audio_enc (GstCameraBinVideo * vid)
+{
+  return vid->aud_enc ? vid->aud_enc : vid->user_aud_enc;
+}
+
+GstElement *
+gst_camerabin_video_get_muxer (GstCameraBinVideo * vid)
+{
+  return vid->muxer ? vid->muxer : vid->user_mux;
+}
+
+GstElement *
+gst_camerabin_video_get_audio_src (GstCameraBinVideo * vid)
+{
+  return vid->aud_src ? vid->aud_src : vid->user_aud_src;
+}