From 19e5736acd9557ad0458b39ecdabccfcfb9c8d00 Mon Sep 17 00:00:00 2001
From: Thiago Santos <thiago.sousa.santos@collabora.co.uk>
Date: Thu, 11 Aug 2011 18:59:07 -0300
Subject: [PATCH] camerabin2: Add audio-filter property

Adds a property to add a custom GstElement to the audio
branch of the pipeline. This allows the user to do custom audio
processing/analysis when recording videos.
---
 gst/camerabin2/gstcamerabin2.c | 28 +++++++++++++++++++++++++++-
 gst/camerabin2/gstcamerabin2.h |  2 ++
 2 files changed, 29 insertions(+), 1 deletion(-)

diff --git a/gst/camerabin2/gstcamerabin2.c b/gst/camerabin2/gstcamerabin2.c
index 3c3a6944ed..fc517e1219 100644
--- a/gst/camerabin2/gstcamerabin2.c
+++ b/gst/camerabin2/gstcamerabin2.c
@@ -221,7 +221,8 @@ enum
   PROP_MAX_ZOOM,
   PROP_IMAGE_ENCODING_PROFILE,
   PROP_IDLE,
-  PROP_FLAGS
+  PROP_FLAGS,
+  PROP_AUDIO_FILTER
 };
 
 enum
@@ -545,9 +546,13 @@ gst_camera_bin_dispose (GObject * object)
     gst_object_unref (camerabin->image_filter);
   if (camerabin->viewfinder_filter)
     gst_object_unref (camerabin->viewfinder_filter);
+  if (camerabin->audio_filter)
+    gst_object_unref (camerabin->audio_filter);
 
   if (camerabin->user_video_filter)
     gst_object_unref (camerabin->user_video_filter);
+  if (camerabin->user_audio_filter)
+    gst_object_unref (camerabin->user_audio_filter);
   if (camerabin->user_image_filter)
     gst_object_unref (camerabin->user_image_filter);
   if (camerabin->user_viewfinder_filter)
@@ -722,6 +727,12 @@ gst_camera_bin_class_init (GstCameraBin2Class * klass)
           " (Should be set on NULL state)",
           GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
 
+  g_object_class_install_property (object_class, PROP_AUDIO_FILTER,
+      g_param_spec_object ("audio-filter", "Audio filter",
+          "The element that will process captured audio buffers when recording"
+          ". (Should be set on NULL state)",
+          GST_TYPE_ELEMENT, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
+
   g_object_class_install_property (object_class, PROP_PREVIEW_FILTER,
       g_param_spec_object ("preview-filter", "Preview filter",
           "The element that will process preview buffers."
@@ -1530,6 +1541,11 @@ gst_camera_bin_create_elements (GstCameraBin2 * camera)
     gst_element_link_many (camera->audio_src, camera->audio_volume,
         camera->audio_capsfilter, NULL);
   }
+  if (has_audio) {
+    gst_camera_bin_check_and_replace_filter (camera, &camera->audio_filter,
+        camera->user_audio_filter, camera->audio_src, camera->audio_volume,
+        "src");
+  }
 
   if ((profile_switched && has_audio) || new_audio_src) {
     if (GST_PAD_LINK_FAILED (gst_camera_bin_link_encodebin (camera,
@@ -1843,6 +1859,12 @@ gst_camera_bin_set_property (GObject * object, guint prop_id,
         g_object_set (camera->src, "preview-filter", camera->preview_filter,
             NULL);
       break;
+    case PROP_AUDIO_FILTER:
+      if (camera->user_audio_filter)
+        g_object_unref (camera->user_audio_filter);
+
+      camera->user_audio_filter = g_value_dup_object (value);
+      break;
     case PROP_VIEWFINDER_SINK:
       g_object_set (camera->viewfinderbin, "video-sink",
           g_value_get_object (value), NULL);
@@ -1999,6 +2021,10 @@ gst_camera_bin_get_property (GObject * object, guint prop_id,
       if (camera->user_viewfinder_filter)
         g_value_set_object (value, camera->user_viewfinder_filter);
       break;
+    case PROP_AUDIO_FILTER:
+      if (camera->user_audio_filter)
+        g_value_set_object (value, camera->user_audio_filter);
+      break;
     case PROP_PREVIEW_FILTER:
       if (camera->preview_filter)
         g_value_set_object (value, camera->preview_filter);
diff --git a/gst/camerabin2/gstcamerabin2.h b/gst/camerabin2/gstcamerabin2.h
index 3276429ca7..e8611a8774 100644
--- a/gst/camerabin2/gstcamerabin2.h
+++ b/gst/camerabin2/gstcamerabin2.h
@@ -68,9 +68,11 @@ struct _GstCameraBin2
   GstElement *video_filter;
   GstElement *image_filter;
   GstElement *viewfinder_filter;
+  GstElement *audio_filter;
   GstElement *user_video_filter;
   GstElement *user_image_filter;
   GstElement *user_viewfinder_filter;
+  GstElement *user_audio_filter;
 
   GstElement *audio_src;
   GstElement *user_audio_src;