bluez: Add an a2dpsrc bin element

This wraps avdtpsrc + rtpsbcdepay into a single element. when more
formats are supported in avdtpsrc, payloader selection will need to be
done dynamically.

This could also be extended to accept a device, connect to it, and
provide avdtpsrc a transport (instead of passing through a transport as
it does now).

sys/bluez/gsta2dpsink.c

@@ -39,7 +39,6 @@ GST_DEBUG_CATEGORY_STATIC (gst_a2dp_sink_debug);
 #define GST_CAT_DEFAULT gst_a2dp_sink_debug
 
 #define A2DP_SBC_RTP_PAYLOAD_TYPE 1
-#define TEMPLATE_MAX_BITPOOL_STR "64"
 
 #define DEFAULT_AUTOCONNECT TRUE
 

sys/bluez/gsta2dpsrc.c

@@ -0,0 +1,192 @@
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2012  Collabora Ltd.
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "gsta2dpsrc.h"
+#include "gstavdtputil.h"
+
+GST_DEBUG_CATEGORY (a2dpsrc_debug);
+#define GST_CAT_DEFAULT (a2dpsrc_debug)
+
+enum
+{
+  PROP_0,
+  PROP_TRANSPORT
+};
+
+GST_BOILERPLATE (GstA2dpSrc, gst_a2dp_src, GstBin, GST_TYPE_BIN);
+
+static void gst_a2dp_src_finalize (GObject * object);
+static void gst_a2dp_src_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+static void gst_a2dp_src_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+
+static GstStaticPadTemplate gst_a2dp_src_template =
+GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-sbc, "
+        "rate = (int) { 16000, 32000, 44100, 48000 }, "
+        "channels = (int) [ 1, 2 ], "
+        "mode = (string) { \"mono\", \"dual\", "
+        "\"stereo\", \"joint\" }, "
+        "blocks = (int) { 4, 8, 12, 16 }, "
+        "subbands = (int) { 4, 8 }, "
+        "allocation = (string) { \"snr\", \"loudness\" }, "
+        "bitpool = (int) [ 2, " TEMPLATE_MAX_BITPOOL_STR " ]"));
+
+static void
+gst_a2dp_src_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&gst_a2dp_src_template));
+
+  gst_element_class_set_details_simple (element_class,
+      "Bluetooth A2DP Source",
+      "Source/Audio/Network",
+      "Receives and depayloads audio from an A2DP device",
+      "Arun Raghavan <arun.raghavan@collabora.co.uk>");
+}
+
+static void
+gst_a2dp_src_class_init (GstA2dpSrcClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+  gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_a2dp_src_finalize);
+  gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_a2dp_src_set_property);
+  gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_a2dp_src_get_property);
+
+  g_object_class_install_property (gobject_class, PROP_TRANSPORT,
+      g_param_spec_string ("transport",
+          "Transport", "Use configured transport", NULL, G_PARAM_READWRITE));
+
+  GST_DEBUG_CATEGORY_INIT (a2dpsrc_debug, "a2dpsrc", 0,
+      "Bluetooth A2DP Source");
+}
+
+static void
+gst_a2dp_src_init (GstA2dpSrc * a2dpsrc, GstA2dpSrcClass * klass)
+{
+  GstBin *bin = GST_BIN (a2dpsrc);
+  GstElement *depay = NULL;
+  GstPad *srcpad, *depay_srcpad;
+
+  /* FIXME: We can set up the bin elements here since we only support
+   * SBC. When supporting more formats, we would need to only instantiate
+   * an avdtpsrc here, wait for it to get to READY, query its srcpad caps
+   * and attach the appropriate RTP depayloader. */
+
+  a2dpsrc->avdtpsrc = gst_element_factory_make ("avdtpsrc", NULL);
+  if (!a2dpsrc->avdtpsrc) {
+    GST_ERROR_OBJECT (a2dpsrc, "Unable to instantiate avdtpsrc");
+    goto fail;
+  }
+
+  depay = gst_element_factory_make ("rtpsbcdepay", NULL);
+  if (!depay) {
+    GST_ERROR_OBJECT (a2dpsrc, "Unable to instantiate rtpsbcdepay");
+    goto fail;
+  }
+
+  if (!gst_bin_add (bin, a2dpsrc->avdtpsrc) || !gst_bin_add (bin, depay) ||
+      !gst_element_link (a2dpsrc->avdtpsrc, depay)) {
+    GST_ERROR_OBJECT (a2dpsrc, "Unable to add elements to bin");
+    goto fail;
+  }
+
+  depay_srcpad = gst_element_get_static_pad (depay, "src");
+  srcpad = gst_ghost_pad_new ("sink", depay_srcpad);
+  gst_object_unref (depay_srcpad);
+
+  if (!gst_element_add_pad (GST_ELEMENT (a2dpsrc), srcpad)) {
+    GST_ERROR_OBJECT (a2dpsrc, "Could not add srcpad");
+    goto fail;
+  }
+
+  /* We keep a copy for easy proxying of properties */
+  gst_object_ref (a2dpsrc->avdtpsrc);
+
+  return;
+
+fail:
+  if (a2dpsrc->avdtpsrc)
+    gst_object_unref (a2dpsrc->avdtpsrc);
+  if (depay)
+    gst_object_unref (depay);
+  if (srcpad)
+    gst_object_unref (srcpad);
+
+  return;
+}
+
+static void
+gst_a2dp_src_finalize (GObject * object)
+{
+  GstA2dpSrc *a2dpsrc = GST_A2DP_SRC (object);
+
+  gst_object_unref (a2dpsrc->avdtpsrc);
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gst_a2dp_src_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstA2dpSrc *a2dpsrc = GST_A2DP_SRC (object);
+
+  switch (prop_id) {
+    case PROP_TRANSPORT:
+      g_object_get_property (G_OBJECT (a2dpsrc->avdtpsrc), "transport", value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_a2dp_src_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstA2dpSrc *a2dpsrc = GST_A2DP_SRC (object);
+
+  switch (prop_id) {
+    case PROP_TRANSPORT:
+      g_object_set_property (G_OBJECT (a2dpsrc->avdtpsrc), "transport", value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+gboolean
+gst_a2dp_src_plugin_init (GstPlugin * plugin)
+{
+  return gst_element_register (plugin, "a2dpsrc", GST_RANK_NONE,
+      GST_TYPE_A2DP_SRC);
+}

sys/bluez/gsta2dpsrc.h

@@ -0,0 +1,59 @@
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2012  Collabora Ltd.
+ *
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2.1 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#ifndef __GST_A2DP_SRC_H
+#define __GST_A2DP_SRC_H
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+#define GST_TYPE_A2DP_SRC \
+	(gst_a2dp_src_get_type())
+#define GST_A2DP_SRC(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_A2DP_SRC, GstA2dpSrc))
+#define GST_A2DP_SRC_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_A2DP_SRC, GstA2dpSrc))
+#define GST_IS_A2DP_SRC(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_A2DP_SRC))
+#define GST_IS_A2DP_SRC_CLASS(obj) \
+	(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_A2DP_SRC))
+typedef struct _GstA2dpSrc GstA2dpSrc;
+typedef struct _GstA2dpSrcClass GstA2dpSrcClass;
+
+struct _GstA2dpSrcClass
+{
+  GstBinClass parentclass;
+};
+
+struct _GstA2dpSrc
+{
+  GstBin parent;
+
+  GstElement *avdtpsrc;
+  GstPad *srcpad;
+};
+
+gboolean gst_a2dp_src_plugin_init (GstPlugin * plugin);
+
+G_END_DECLS
+#endif

sys/bluez/gstavdtputil.h

@@ -31,6 +31,7 @@
 
 G_BEGIN_DECLS
 #define DEFAULT_CODEC_BUFFER_SIZE 2048
+#define TEMPLATE_MAX_BITPOOL_STR "64"
     struct bluetooth_data
 {
   guint link_mtu;