From d542fb37a81d1d96604d41b36a6d6b11087ba2da Mon Sep 17 00:00:00 2001
From: Marcel Holtmann <marcel@holtmann.org>
Date: Sat, 25 Aug 2007 19:32:03 +0000
Subject: Implement full encoding support

---
 audio/gstsbcenc.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
 audio/gstsbcenc.h |   4 ++
 2 files changed, 117 insertions(+), 2 deletions(-)

diff --git a/audio/gstsbcenc.c b/audio/gstsbcenc.c
index 6e63ac45..86a66270 100644
--- a/audio/gstsbcenc.c
+++ b/audio/gstsbcenc.c
@@ -25,7 +25,7 @@
 #include <config.h>
 #endif
 
-#include "sbc.h"
+#include <string.h>
 
 #include "gstsbcenc.h"
 
@@ -40,21 +40,132 @@ static const GstElementDetails sbc_enc_details =
 				"Encode a SBC audio stream",
 				"Marcel Holtmann <marcel@holtmann.org>");
 
+static GstStaticPadTemplate sbc_enc_sink_factory =
+	GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+		GST_STATIC_CAPS("audio/x-raw-int, "
+				"rate = (int) { 16000, 32000, 44100, 48000 }, "
+				"channels = (int) [ 1, 2 ], "
+				"endianness = (int) BYTE_ORDER, "
+				"signed = (boolean) true, "
+				"width = (int) 16, "
+				"depth = (int) 16"));
+
+static GstStaticPadTemplate sbc_enc_src_factory =
+	GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+		GST_STATIC_CAPS("audio/x-sbc"));
+
+static GstFlowReturn sbc_enc_chain(GstPad *pad, GstBuffer *buffer)
+{
+	GstSbcEnc *enc = GST_SBC_ENC(gst_pad_get_parent(pad));
+	GstFlowReturn res = GST_FLOW_OK;
+	GstStructure *structure;
+	gint rate, channels;
+	guint size, offset = 0;
+	guint8 *data;
+
+	data = GST_BUFFER_DATA(buffer);
+	size = GST_BUFFER_SIZE(buffer);
+
+	structure = gst_caps_get_structure(GST_PAD_CAPS(pad), 0);
+	gst_structure_get_int(structure, "rate", &rate);
+	gst_structure_get_int(structure, "channels", &channels);
+
+	enc->sbc.rate = rate;
+	enc->sbc.channels = channels;
+	enc->sbc.subbands = 8;
+	enc->sbc.joint = 0;
+
+	while (offset < size) {
+		GstBuffer *output;
+		GstCaps *caps;
+		int consumed;
+
+		consumed = sbc_encode(&enc->sbc, data + offset, size - offset);
+		if (consumed <= 0)
+			break;
+
+		caps = GST_PAD_CAPS(enc->srcpad);
+
+		res = gst_pad_alloc_buffer_and_set_caps(enc->srcpad,
+						GST_BUFFER_OFFSET_NONE,
+						enc->sbc.len, caps, &output);
+
+		if (res != GST_FLOW_OK)
+			goto done;
+
+		memcpy(GST_BUFFER_DATA(output), enc->sbc.data, enc->sbc.len);
+
+		res = gst_pad_push(enc->srcpad, output);
+		if (res != GST_FLOW_OK)
+			goto done;
+
+		offset += consumed;
+	}
+
+	if (offset < size)
+		res = GST_FLOW_ERROR;
+
+done:
+	gst_buffer_unref(buffer);
+	gst_object_unref(enc);
+
+	return res;
+}
+
+static GstStateChangeReturn sbc_enc_change_state(GstElement *element,
+						GstStateChange transition)
+{
+	GstSbcEnc *enc = GST_SBC_ENC(element);
+
+	switch (transition) {
+	case GST_STATE_CHANGE_READY_TO_PAUSED:
+		GST_DEBUG("Setup subband codec");
+		sbc_init(&enc->sbc, 0);
+		break;
+
+	case GST_STATE_CHANGE_PAUSED_TO_READY:
+		GST_DEBUG("Finish subband codec");
+		sbc_finish(&enc->sbc);
+		break;
+
+	default:
+		break;
+	}
+
+	return parent_class->change_state(element, transition);
+}
+
 static void gst_sbc_enc_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_enc_sink_factory));
+
+	gst_element_class_add_pad_template(element_class,
+		gst_static_pad_template_get(&sbc_enc_src_factory));
+
 	gst_element_class_set_details(element_class, &sbc_enc_details);
 }
 
 static void gst_sbc_enc_class_init(GstSbcEncClass *klass)
 {
+	GstElementClass *element_class = GST_ELEMENT_CLASS(klass);
+
 	parent_class = g_type_class_peek_parent(klass);
 
+	element_class->change_state = GST_DEBUG_FUNCPTR(sbc_enc_change_state);
+
 	GST_DEBUG_CATEGORY_INIT(sbc_enc_debug, "sbcenc", 0,
 						"SBC encoding element");
 }
 
-static void gst_sbc_enc_init(GstSbcEnc *sbcenc, GstSbcEncClass *klass)
+static void gst_sbc_enc_init(GstSbcEnc *self, GstSbcEncClass *klass)
 {
+	self->sinkpad = gst_pad_new_from_static_template(&sbc_enc_sink_factory, "sink");
+	gst_element_add_pad(GST_ELEMENT(self), self->sinkpad);
+
+	self->srcpad = gst_pad_new_from_static_template(&sbc_enc_src_factory, "src");
+	gst_pad_set_chain_function(self->sinkpad, GST_DEBUG_FUNCPTR(sbc_enc_chain));
+	gst_element_add_pad(GST_ELEMENT(self), self->srcpad);
 }
diff --git a/audio/gstsbcenc.h b/audio/gstsbcenc.h
index 64457d21..491135c1 100644
--- a/audio/gstsbcenc.h
+++ b/audio/gstsbcenc.h
@@ -23,6 +23,8 @@
 
 #include <gst/gst.h>
 
+#include "sbc.h"
+
 G_BEGIN_DECLS
 
 #define GST_TYPE_SBC_ENC \
@@ -44,6 +46,8 @@ struct _GstSbcEnc {
 
 	GstPad *sinkpad;
 	GstPad *srcpad;
+
+	sbc_t sbc;
 };
 
 struct _GstSbcEncClass {
-- 
cgit