sbc: Implement full parsing support

ext/sbc/gstsbcparse.c

@@ -0,0 +1,194 @@
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2004-2007  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 <string.h>
+
+#include "gstsbcparse.h"
+
+GST_DEBUG_CATEGORY_STATIC(sbc_parse_debug);
+#define GST_CAT_DEFAULT sbc_parse_debug
+
+GST_BOILERPLATE(GstSbcParse, gst_sbc_parse, GstElement, GST_TYPE_ELEMENT);
+
+static const GstElementDetails sbc_parse_details =
+	GST_ELEMENT_DETAILS("Bluetooth SBC parser",
+				"Codec/Parser/Audio",
+				"Parse a SBC audio stream",
+				"Marcel Holtmann <marcel@holtmann.org>");
+
+static GstStaticPadTemplate sbc_parse_sink_factory =
+	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+		GST_STATIC_CAPS("audio/x-sbc"));
+
+static GstStaticPadTemplate sbc_parse_src_factory =
+	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 }"));
+
+static GstFlowReturn sbc_parse_chain(GstPad *pad, GstBuffer *buffer)
+{
+	GstSbcParse *parse = GST_SBC_PARSE(gst_pad_get_parent(pad));
+	GstFlowReturn res = GST_FLOW_OK;
+	guint size, offset = 0;
+	guint8 *data;
+	GstClockTime timestamp;
+
+	timestamp = GST_BUFFER_TIMESTAMP(buffer);
+
+	if (parse->buffer) {
+		GstBuffer *temp = buffer;
+		buffer = gst_buffer_span(parse->buffer, 0, buffer,
+			GST_BUFFER_SIZE(parse->buffer) + GST_BUFFER_SIZE(buffer));
+		gst_buffer_unref(temp);
+		gst_buffer_unref(parse->buffer);
+		parse->buffer = NULL;
+	}
+
+	data = GST_BUFFER_DATA(buffer);
+	size = GST_BUFFER_SIZE(buffer);
+
+	while (offset < size) {
+		GstBuffer *output;
+		GstPadTemplate *template;
+		GstCaps *caps, *temp;
+		int consumed;
+
+		consumed = sbc_parse(&parse->sbc, data + offset, size - offset);
+		if (consumed <= 0)
+			break;
+
+		caps = gst_caps_new_simple("audio/x-sbc",
+				"rate", G_TYPE_INT, parse->sbc.rate,
+				"channels", G_TYPE_INT, parse->sbc.channels,
+				NULL);
+
+		template = gst_static_pad_template_get(&sbc_parse_src_factory);
+
+		temp = gst_caps_intersect(caps,
+					gst_pad_template_get_caps(template));
+
+		gst_caps_unref(caps);
+
+		res = gst_pad_alloc_buffer_and_set_caps(parse->srcpad,
+						GST_BUFFER_OFFSET_NONE,
+						consumed, temp, &output);
+
+		gst_caps_unref(temp);
+
+		if (res != GST_FLOW_OK)
+			goto done;
+
+		memcpy(GST_BUFFER_DATA(output), data + offset, consumed);
+
+		res = gst_pad_push(parse->srcpad, output);
+		if (res != GST_FLOW_OK)
+			goto done;
+
+		offset += consumed;
+	}
+
+	if (offset < size)
+		parse->buffer = gst_buffer_create_sub(buffer,
+							offset, size - offset);
+
+done:
+	gst_buffer_unref(buffer);
+	gst_object_unref(parse);
+
+	return res;
+}
+
+static GstStateChangeReturn sbc_parse_change_state(GstElement *element,
+						GstStateChange transition)
+{
+	GstSbcParse *parse = GST_SBC_PARSE(element);
+
+	switch (transition) {
+	case GST_STATE_CHANGE_READY_TO_PAUSED:
+		GST_DEBUG("Setup subband codec");
+		if (parse->buffer) {
+			gst_buffer_unref(parse->buffer);
+			parse->buffer = NULL;
+		}
+		sbc_init(&parse->sbc, 0);
+		break;
+
+	case GST_STATE_CHANGE_PAUSED_TO_READY:
+		GST_DEBUG("Finish subband codec");
+		if (parse->buffer) {
+			gst_buffer_unref(parse->buffer);
+			parse->buffer = NULL;
+		}
+		sbc_finish(&parse->sbc);
+		break;
+
+	default:
+		break;
+	}
+
+	return parent_class->change_state(element, transition);
+}
+
+static void gst_sbc_parse_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(&sbc_parse_sink_factory));
+
+	gst_element_class_add_pad_template(element_class,
+		gst_static_pad_template_get(&sbc_parse_src_factory));
+
+	gst_element_class_set_details(element_class, &sbc_parse_details);
+}
+
+static void gst_sbc_parse_class_init(GstSbcParseClass *klass)
+{
+	GstElementClass *element_class = GST_ELEMENT_CLASS(klass);
+
+	parent_class = g_type_class_peek_parent(klass);
+
+	element_class->change_state = GST_DEBUG_FUNCPTR(sbc_parse_change_state);
+
+	GST_DEBUG_CATEGORY_INIT(sbc_parse_debug, "sbcparse", 0,
+						"SBC parsing element");
+}
+
+static void gst_sbc_parse_init(GstSbcParse *self, GstSbcParseClass *klass)
+{
+	self->sinkpad = gst_pad_new_from_static_template(&sbc_parse_sink_factory, "sink");
+	gst_pad_set_chain_function(self->sinkpad, GST_DEBUG_FUNCPTR(sbc_parse_chain));
+	gst_element_add_pad(GST_ELEMENT(self), self->sinkpad);
+
+	self->srcpad = gst_pad_new_from_static_template(&sbc_parse_src_factory, "src");
+	gst_element_add_pad(GST_ELEMENT(self), self->srcpad);
+}

ext/sbc/gstsbcparse.h

@@ -0,0 +1,61 @@
+/*
+ *
+ *  BlueZ - Bluetooth protocol stack for Linux
+ *
+ *  Copyright (C) 2004-2007  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
+ *
+ */
+
+#include <gst/gst.h>
+
+#include "sbc.h"
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_SBC_PARSE \
+	(gst_sbc_parse_get_type())
+#define GST_SBC_PARSE(obj) \
+	(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SBC_PARSE,GstSbcParse))
+#define GST_SBC_PARSE_CLASS(klass) \
+	(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SBC_PARSE,GstSbcParseClass))
+#define GST_IS_SBC_PARSE(obj) \
+	(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SBC_PARSE))
+#define GST_IS_SBC_PARSE_CLASS(obj) \
+	(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SBC_PARSE))
+
+typedef struct _GstSbcParse GstSbcParse;
+typedef struct _GstSbcParseClass GstSbcParseClass;
+
+struct _GstSbcParse {
+	GstElement element;
+
+	GstPad *sinkpad;
+	GstPad *srcpad;
+
+	GstBuffer *buffer;
+
+	sbc_t sbc;
+};
+
+struct _GstSbcParseClass {
+	GstElementClass parent_class;
+};
+
+GType gst_sbc_parse_get_type(void);
+
+G_END_DECLS