audio/gstrtpsbcpay.c - bluez-imx - Git at Google

 /*
  *
  *  BlueZ - Bluetooth protocol stack for Linux
  *
  *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
  *
  *
  *  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
  *
  */

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #include "gstpragma.h"
 #include "gstrtpsbcpay.h"
 #include <math.h>
 #include <string.h>

 #define RTP_SBC_PAYLOAD_HEADER_SIZE 1
 #define DEFAULT_MIN_FRAMES 0
 #define RTP_SBC_HEADER_TOTAL (12 + RTP_SBC_PAYLOAD_HEADER_SIZE)

 #if __BYTE_ORDER == __LITTLE_ENDIAN

 struct rtp_payload {
 	guint8 frame_count:4;
 	guint8 rfa0:1;
 	guint8 is_last_fragment:1;
 	guint8 is_first_fragment:1;
 	guint8 is_fragmented:1;
 } __attribute__ ((packed));

 #elif __BYTE_ORDER == __BIG_ENDIAN

 struct rtp_payload {
 	guint8 is_fragmented:1;
 	guint8 is_first_fragment:1;
 	guint8 is_last_fragment:1;
 	guint8 rfa0:1;
 	guint8 frame_count:4;
 } __attribute__ ((packed));

 #else
 #error "Unknown byte order"
 #endif

 enum {
 	PROP_0,
 	PROP_MIN_FRAMES
 };

 GST_DEBUG_CATEGORY_STATIC(gst_rtp_sbc_pay_debug);
 #define GST_CAT_DEFAULT gst_rtp_sbc_pay_debug

 GST_BOILERPLATE(GstRtpSBCPay, gst_rtp_sbc_pay, GstBaseRTPPayload,
 		GST_TYPE_BASE_RTP_PAYLOAD);

 static const GstElementDetails gst_rtp_sbc_pay_details =
 	GST_ELEMENT_DETAILS("RTP packet payloader",
 				"Codec/Payloader/Network",
 				"Payload SBC audio as RTP packets",
 				"Thiago Sousa Santos "
 				"<thiagoss@lcc.ufcg.edu.br>");

 static GstStaticPadTemplate gst_rtp_sbc_pay_sink_factory =
 	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, 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, 64 ]")
 	);

 static GstStaticPadTemplate gst_rtp_sbc_pay_src_factory =
 	GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS,
 		GST_STATIC_CAPS(
 			"application/x-rtp, "
 			"media = (string) \"audio\","
 			"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
 			"clock-rate = (int) { 16000, 32000, 44100, 48000 },"
 			"encoding-name = (string) \"SBC\"")
 	);

 static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id,
 				const GValue *value, GParamSpec *pspec);
 static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id,
 				GValue *value, GParamSpec *pspec);

 static gint gst_rtp_sbc_pay_get_frame_len(gint subbands, gint channels,
 		gint blocks, gint bitpool, const gchar *channel_mode)
 {
 	gint len;
 	gint join;

 	len = 4 + (4 * subbands * channels)/8;

 	if (strcmp(channel_mode, "mono") == 0 ||
 		strcmp(channel_mode, "dual") == 0)
 		len += ((blocks * channels * bitpool) + 7) / 8;
 	else {
 		join = strcmp(channel_mode, "joint") == 0 ? 1 : 0;
 		len += ((join * subbands + blocks * bitpool) + 7) / 8;
 	}

 	return len;
 }

 static gboolean gst_rtp_sbc_pay_set_caps(GstBaseRTPPayload *payload,
 			GstCaps *caps)
 {
 	GstRtpSBCPay *sbcpay;
 	gint rate, subbands, channels, blocks, bitpool;
 	gint frame_len;
 	const gchar *channel_mode;
 	GstStructure *structure;

 	sbcpay = GST_RTP_SBC_PAY(payload);

 	structure = gst_caps_get_structure(caps, 0);
 	if (!gst_structure_get_int(structure, "rate", &rate))
 		return FALSE;
 	if (!gst_structure_get_int(structure, "channels", &channels))
 		return FALSE;
 	if (!gst_structure_get_int(structure, "blocks", &blocks))
 		return FALSE;
 	if (!gst_structure_get_int(structure, "bitpool", &bitpool))
 		return FALSE;
 	if (!gst_structure_get_int(structure, "subbands", &subbands))
 		return FALSE;

 	channel_mode = gst_structure_get_string(structure, "mode");
 	if (!channel_mode)
 		return FALSE;

 	frame_len = gst_rtp_sbc_pay_get_frame_len(subbands, channels, blocks,
 				bitpool, channel_mode);

 	sbcpay->frame_length = frame_len;

 	gst_basertppayload_set_options(payload, "audio", TRUE, "SBC", rate);

 	GST_DEBUG_OBJECT(payload, "calculated frame length: %d ", frame_len);

 	return gst_basertppayload_set_outcaps(payload, NULL);
 }

 static GstFlowReturn gst_rtp_sbc_pay_flush_buffers(GstRtpSBCPay *sbcpay)
 {
 	guint available;
 	guint max_payload;
 	GstBuffer *outbuf;
 	guint8 *payload_data;
 	guint frame_count;
 	guint payload_length;
 	struct rtp_payload *payload;

 	if (sbcpay->frame_length == 0) {
 		GST_ERROR_OBJECT(sbcpay, "Frame length is 0");
 		return GST_FLOW_ERROR;
 	}

 	available = gst_adapter_available(sbcpay->adapter);

 	max_payload = gst_rtp_buffer_calc_payload_len(
 		GST_BASE_RTP_PAYLOAD_MTU(sbcpay) - RTP_SBC_PAYLOAD_HEADER_SIZE,
 		0, 0);

 	max_payload = MIN(max_payload, available);
 	frame_count = max_payload / sbcpay->frame_length;
 	payload_length = frame_count * sbcpay->frame_length;
 	if (payload_length == 0) /* Nothing to send */
 		return GST_FLOW_OK;

 	outbuf = gst_rtp_buffer_new_allocate(payload_length +
 			RTP_SBC_PAYLOAD_HEADER_SIZE, 0, 0);

 	gst_rtp_buffer_set_payload_type(outbuf,
 			GST_BASE_RTP_PAYLOAD_PT(sbcpay));

 	payload_data = gst_rtp_buffer_get_payload(outbuf);
 	payload = (struct rtp_payload *) payload_data;
 	memset(payload, 0, sizeof(struct rtp_payload));
 	payload->frame_count = frame_count;

 	gst_adapter_copy(sbcpay->adapter, payload_data +
 			RTP_SBC_PAYLOAD_HEADER_SIZE, 0, payload_length);
 	gst_adapter_flush(sbcpay->adapter, payload_length);

 	GST_BUFFER_TIMESTAMP(outbuf) = sbcpay->timestamp;
 	GST_DEBUG_OBJECT(sbcpay, "Pushing %d bytes", payload_length);

 	return gst_basertppayload_push(GST_BASE_RTP_PAYLOAD(sbcpay), outbuf);
 }

 static GstFlowReturn gst_rtp_sbc_pay_handle_buffer(GstBaseRTPPayload *payload,
 			GstBuffer *buffer)
 {
 	GstRtpSBCPay *sbcpay;
 	guint available;

 	/* FIXME check for negotiation */

 	sbcpay = GST_RTP_SBC_PAY(payload);
 	sbcpay->timestamp = GST_BUFFER_TIMESTAMP(buffer);

 	gst_adapter_push(sbcpay->adapter, buffer);

 	available = gst_adapter_available(sbcpay->adapter);
 	if (available + RTP_SBC_HEADER_TOTAL >=
 				GST_BASE_RTP_PAYLOAD_MTU(sbcpay) ||
 			(available >
 				(sbcpay->min_frames * sbcpay->frame_length)))
 		return gst_rtp_sbc_pay_flush_buffers(sbcpay);

 	return GST_FLOW_OK;
 }

 static gboolean gst_rtp_sbc_pay_handle_event(GstPad *pad,
 				GstEvent *event)
 {
 	GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(GST_PAD_PARENT(pad));

 	switch (GST_EVENT_TYPE(event)) {
 	case GST_EVENT_EOS:
 		gst_rtp_sbc_pay_flush_buffers(sbcpay);
 		break;
 	default:
 		break;
 	}

 	return FALSE;
 }

 static void gst_rtp_sbc_pay_base_init(gpointer g_class)
 {
 	GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

 	gst_element_class_add_pad_template(element_class,
 		gst_static_pad_template_get(&gst_rtp_sbc_pay_sink_factory));
 	gst_element_class_add_pad_template(element_class,
 		gst_static_pad_template_get(&gst_rtp_sbc_pay_src_factory));

 	gst_element_class_set_details(element_class, &gst_rtp_sbc_pay_details);
 }

 static void gst_rtp_sbc_pay_finalize(GObject *object)
 {
 	GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(object);
 	g_object_unref(sbcpay->adapter);

 	GST_CALL_PARENT(G_OBJECT_CLASS, finalize, (object));
 }

 static void gst_rtp_sbc_pay_class_init(GstRtpSBCPayClass *klass)
 {
 	GObjectClass *gobject_class;
 	GstBaseRTPPayloadClass *payload_class =
 		GST_BASE_RTP_PAYLOAD_CLASS(klass);

 	gobject_class = G_OBJECT_CLASS(klass);
 	parent_class = g_type_class_peek_parent(klass);

 	gobject_class->finalize = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_finalize);
 	gobject_class->set_property = GST_DEBUG_FUNCPTR(
 			gst_rtp_sbc_pay_set_property);
 	gobject_class->get_property = GST_DEBUG_FUNCPTR(
 			gst_rtp_sbc_pay_get_property);

 	payload_class->set_caps = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_set_caps);
 	payload_class->handle_buffer = GST_DEBUG_FUNCPTR(
 			gst_rtp_sbc_pay_handle_buffer);
 	payload_class->handle_event = GST_DEBUG_FUNCPTR(
 			gst_rtp_sbc_pay_handle_event);

 	/* properties */
 	g_object_class_install_property(G_OBJECT_CLASS(klass),
 		PROP_MIN_FRAMES,
 		g_param_spec_int("min-frames", "minimum frame number",
 		"Minimum quantity of frames to send in one packet "
 		"(-1 for maximum allowed by the mtu)",
 		-1, G_MAXINT, DEFAULT_MIN_FRAMES, G_PARAM_READWRITE));

 	GST_DEBUG_CATEGORY_INIT(gst_rtp_sbc_pay_debug, "rtpsbcpay", 0,
 				"RTP SBC payloader");
 }

 static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id,
 					const GValue *value, GParamSpec *pspec)
 {
 	GstRtpSBCPay *sbcpay;

 	sbcpay = GST_RTP_SBC_PAY(object);

 	switch (prop_id) {
 	case PROP_MIN_FRAMES:
 		sbcpay->min_frames = g_value_get_int(value);
 		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 	break;
 	}
 }

 static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id,
 					GValue *value, GParamSpec *pspec)
 {
 	GstRtpSBCPay *sbcpay;

 	sbcpay = GST_RTP_SBC_PAY(object);

 	switch (prop_id) {
 	case PROP_MIN_FRAMES:
 		g_value_set_int(value, sbcpay->min_frames);
 		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
 	break;
 	}
 }

 static void gst_rtp_sbc_pay_init(GstRtpSBCPay *self, GstRtpSBCPayClass *klass)
 {
 	self->adapter = gst_adapter_new();
 	self->frame_length = 0;
 	self->timestamp = 0;

 	self->min_frames = DEFAULT_MIN_FRAMES;
 }

 gboolean gst_rtp_sbc_pay_plugin_init(GstPlugin *plugin)
 {
 	return gst_element_register(plugin, "rtpsbcpay", GST_RANK_NONE,
 							GST_TYPE_RTP_SBC_PAY);
 }
	/*
	*
	* BlueZ - Bluetooth protocol stack for Linux
	*
	* Copyright (C) 2004-2010 Marcel Holtmann <marcel@holtmann.org>
	*
	*
	* 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
	*
	*/

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include "gstpragma.h"
	#include "gstrtpsbcpay.h"
	#include <math.h>
	#include <string.h>

	#define RTP_SBC_PAYLOAD_HEADER_SIZE 1
	#define DEFAULT_MIN_FRAMES 0
	#define RTP_SBC_HEADER_TOTAL (12 + RTP_SBC_PAYLOAD_HEADER_SIZE)

	#if __BYTE_ORDER == __LITTLE_ENDIAN

	struct rtp_payload {
	guint8 frame_count:4;
	guint8 rfa0:1;
	guint8 is_last_fragment:1;
	guint8 is_first_fragment:1;
	guint8 is_fragmented:1;
	} __attribute__ ((packed));

	#elif __BYTE_ORDER == __BIG_ENDIAN

	struct rtp_payload {
	guint8 is_fragmented:1;
	guint8 is_first_fragment:1;
	guint8 is_last_fragment:1;
	guint8 rfa0:1;
	guint8 frame_count:4;
	} __attribute__ ((packed));

	#else
	#error "Unknown byte order"
	#endif

	enum {
	PROP_0,
	PROP_MIN_FRAMES
	};

	GST_DEBUG_CATEGORY_STATIC(gst_rtp_sbc_pay_debug);
	#define GST_CAT_DEFAULT gst_rtp_sbc_pay_debug

	GST_BOILERPLATE(GstRtpSBCPay, gst_rtp_sbc_pay, GstBaseRTPPayload,
	GST_TYPE_BASE_RTP_PAYLOAD);

	static const GstElementDetails gst_rtp_sbc_pay_details =
	GST_ELEMENT_DETAILS("RTP packet payloader",
	"Codec/Payloader/Network",
	"Payload SBC audio as RTP packets",
	"Thiago Sousa Santos "
	"<thiagoss@lcc.ufcg.edu.br>");

	static GstStaticPadTemplate gst_rtp_sbc_pay_sink_factory =
	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, 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, 64 ]")
	);

	static GstStaticPadTemplate gst_rtp_sbc_pay_src_factory =
	GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS,
	GST_STATIC_CAPS(
	"application/x-rtp, "
	"media = (string) \"audio\","
	"payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
	"clock-rate = (int) { 16000, 32000, 44100, 48000 },"
	"encoding-name = (string) \"SBC\"")
	);

	static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id,
	const GValue value, GParamSpec pspec);
	static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id,
	GValue value, GParamSpec pspec);

	static gint gst_rtp_sbc_pay_get_frame_len(gint subbands, gint channels,
	gint blocks, gint bitpool, const gchar *channel_mode)
	{
	gint len;
	gint join;

	len = 4 + (4 * subbands * channels)/8;

	if (strcmp(channel_mode, "mono") == 0 \|\|
	strcmp(channel_mode, "dual") == 0)
	len += ((blocks * channels * bitpool) + 7) / 8;
	else {
	join = strcmp(channel_mode, "joint") == 0 ? 1 : 0;
	len += ((join * subbands + blocks * bitpool) + 7) / 8;
	}

	return len;
	}

	static gboolean gst_rtp_sbc_pay_set_caps(GstBaseRTPPayload *payload,
	GstCaps *caps)
	{
	GstRtpSBCPay *sbcpay;
	gint rate, subbands, channels, blocks, bitpool;
	gint frame_len;
	const gchar *channel_mode;
	GstStructure *structure;

	sbcpay = GST_RTP_SBC_PAY(payload);

	structure = gst_caps_get_structure(caps, 0);
	if (!gst_structure_get_int(structure, "rate", &rate))
	return FALSE;
	if (!gst_structure_get_int(structure, "channels", &channels))
	return FALSE;
	if (!gst_structure_get_int(structure, "blocks", &blocks))
	return FALSE;
	if (!gst_structure_get_int(structure, "bitpool", &bitpool))
	return FALSE;
	if (!gst_structure_get_int(structure, "subbands", &subbands))
	return FALSE;

	channel_mode = gst_structure_get_string(structure, "mode");
	if (!channel_mode)
	return FALSE;

	frame_len = gst_rtp_sbc_pay_get_frame_len(subbands, channels, blocks,
	bitpool, channel_mode);

	sbcpay->frame_length = frame_len;

	gst_basertppayload_set_options(payload, "audio", TRUE, "SBC", rate);

	GST_DEBUG_OBJECT(payload, "calculated frame length: %d ", frame_len);

	return gst_basertppayload_set_outcaps(payload, NULL);
	}

	static GstFlowReturn gst_rtp_sbc_pay_flush_buffers(GstRtpSBCPay *sbcpay)
	{
	guint available;
	guint max_payload;
	GstBuffer *outbuf;
	guint8 *payload_data;
	guint frame_count;
	guint payload_length;
	struct rtp_payload *payload;

	if (sbcpay->frame_length == 0) {
	GST_ERROR_OBJECT(sbcpay, "Frame length is 0");
	return GST_FLOW_ERROR;
	}

	available = gst_adapter_available(sbcpay->adapter);

	max_payload = gst_rtp_buffer_calc_payload_len(
	GST_BASE_RTP_PAYLOAD_MTU(sbcpay) - RTP_SBC_PAYLOAD_HEADER_SIZE,
	0, 0);

	max_payload = MIN(max_payload, available);
	frame_count = max_payload / sbcpay->frame_length;
	payload_length = frame_count * sbcpay->frame_length;
	if (payload_length == 0) /* Nothing to send */
	return GST_FLOW_OK;

	outbuf = gst_rtp_buffer_new_allocate(payload_length +
	RTP_SBC_PAYLOAD_HEADER_SIZE, 0, 0);

	gst_rtp_buffer_set_payload_type(outbuf,
	GST_BASE_RTP_PAYLOAD_PT(sbcpay));

	payload_data = gst_rtp_buffer_get_payload(outbuf);
	payload = (struct rtp_payload *) payload_data;
	memset(payload, 0, sizeof(struct rtp_payload));
	payload->frame_count = frame_count;

	gst_adapter_copy(sbcpay->adapter, payload_data +
	RTP_SBC_PAYLOAD_HEADER_SIZE, 0, payload_length);
	gst_adapter_flush(sbcpay->adapter, payload_length);

	GST_BUFFER_TIMESTAMP(outbuf) = sbcpay->timestamp;
	GST_DEBUG_OBJECT(sbcpay, "Pushing %d bytes", payload_length);

	return gst_basertppayload_push(GST_BASE_RTP_PAYLOAD(sbcpay), outbuf);
	}

	static GstFlowReturn gst_rtp_sbc_pay_handle_buffer(GstBaseRTPPayload *payload,
	GstBuffer *buffer)
	{
	GstRtpSBCPay *sbcpay;
	guint available;

	/* FIXME check for negotiation */

	sbcpay = GST_RTP_SBC_PAY(payload);
	sbcpay->timestamp = GST_BUFFER_TIMESTAMP(buffer);

	gst_adapter_push(sbcpay->adapter, buffer);

	available = gst_adapter_available(sbcpay->adapter);
	if (available + RTP_SBC_HEADER_TOTAL >=
	GST_BASE_RTP_PAYLOAD_MTU(sbcpay) \|\|
	(available >
	(sbcpay->min_frames * sbcpay->frame_length)))
	return gst_rtp_sbc_pay_flush_buffers(sbcpay);

	return GST_FLOW_OK;
	}

	static gboolean gst_rtp_sbc_pay_handle_event(GstPad *pad,
	GstEvent *event)
	{
	GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(GST_PAD_PARENT(pad));

	switch (GST_EVENT_TYPE(event)) {
	case GST_EVENT_EOS:
	gst_rtp_sbc_pay_flush_buffers(sbcpay);
	break;
	default:
	break;
	}

	return FALSE;
	}

	static void gst_rtp_sbc_pay_base_init(gpointer g_class)
	{
	GstElementClass *element_class = GST_ELEMENT_CLASS(g_class);

	gst_element_class_add_pad_template(element_class,
	gst_static_pad_template_get(&gst_rtp_sbc_pay_sink_factory));
	gst_element_class_add_pad_template(element_class,
	gst_static_pad_template_get(&gst_rtp_sbc_pay_src_factory));

	gst_element_class_set_details(element_class, &gst_rtp_sbc_pay_details);
	}

	static void gst_rtp_sbc_pay_finalize(GObject *object)
	{
	GstRtpSBCPay *sbcpay = GST_RTP_SBC_PAY(object);
	g_object_unref(sbcpay->adapter);

	GST_CALL_PARENT(G_OBJECT_CLASS, finalize, (object));
	}

	static void gst_rtp_sbc_pay_class_init(GstRtpSBCPayClass *klass)
	{
	GObjectClass *gobject_class;
	GstBaseRTPPayloadClass *payload_class =
	GST_BASE_RTP_PAYLOAD_CLASS(klass);

	gobject_class = G_OBJECT_CLASS(klass);
	parent_class = g_type_class_peek_parent(klass);

	gobject_class->finalize = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_finalize);
	gobject_class->set_property = GST_DEBUG_FUNCPTR(
	gst_rtp_sbc_pay_set_property);
	gobject_class->get_property = GST_DEBUG_FUNCPTR(
	gst_rtp_sbc_pay_get_property);

	payload_class->set_caps = GST_DEBUG_FUNCPTR(gst_rtp_sbc_pay_set_caps);
	payload_class->handle_buffer = GST_DEBUG_FUNCPTR(
	gst_rtp_sbc_pay_handle_buffer);
	payload_class->handle_event = GST_DEBUG_FUNCPTR(
	gst_rtp_sbc_pay_handle_event);

	/* properties */
	g_object_class_install_property(G_OBJECT_CLASS(klass),
	PROP_MIN_FRAMES,
	g_param_spec_int("min-frames", "minimum frame number",
	"Minimum quantity of frames to send in one packet "
	"(-1 for maximum allowed by the mtu)",
	-1, G_MAXINT, DEFAULT_MIN_FRAMES, G_PARAM_READWRITE));

	GST_DEBUG_CATEGORY_INIT(gst_rtp_sbc_pay_debug, "rtpsbcpay", 0,
	"RTP SBC payloader");
	}

	static void gst_rtp_sbc_pay_set_property(GObject *object, guint prop_id,
	const GValue value, GParamSpec pspec)
	{
	GstRtpSBCPay *sbcpay;

	sbcpay = GST_RTP_SBC_PAY(object);

	switch (prop_id) {
	case PROP_MIN_FRAMES:
	sbcpay->min_frames = g_value_get_int(value);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
	break;
	}
	}

	static void gst_rtp_sbc_pay_get_property(GObject *object, guint prop_id,
	GValue value, GParamSpec pspec)
	{
	GstRtpSBCPay *sbcpay;

	sbcpay = GST_RTP_SBC_PAY(object);

	switch (prop_id) {
	case PROP_MIN_FRAMES:
	g_value_set_int(value, sbcpay->min_frames);
	break;
	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
	break;
	}
	}

	static void gst_rtp_sbc_pay_init(GstRtpSBCPay self, GstRtpSBCPayClass klass)
	{
	self->adapter = gst_adapter_new();
	self->frame_length = 0;
	self->timestamp = 0;

	self->min_frames = DEFAULT_MIN_FRAMES;
	}

	gboolean gst_rtp_sbc_pay_plugin_init(GstPlugin *plugin)
	{
	return gst_element_register(plugin, "rtpsbcpay", GST_RANK_NONE,
	GST_TYPE_RTP_SBC_PAY);
	}