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/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2004-2008 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 "gstsbcdec.h"
GST_DEBUG_CATEGORY_STATIC(sbc_dec_debug);
#define GST_CAT_DEFAULT sbc_dec_debug
GST_BOILERPLATE(GstSbcDec, gst_sbc_dec, GstElement, GST_TYPE_ELEMENT);
static const GstElementDetails sbc_dec_details =
GST_ELEMENT_DETAILS("Bluetooth SBC decoder",
"Codec/Decoder/Audio",
"Decode a SBC audio stream",
"Marcel Holtmann <marcel@holtmann.org>");
static GstStaticPadTemplate sbc_dec_sink_factory =
GST_STATIC_PAD_TEMPLATE("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS("audio/x-sbc"));
static GstStaticPadTemplate sbc_dec_src_factory =
GST_STATIC_PAD_TEMPLATE("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS("audio/x-raw-int, "
"rate = (int) { 16000, 32000, 44100, 48000 }, "
"channels = (int) [ 1, 2 ], "
"endianness = (int) LITTLE_ENDIAN, "
"signed = (boolean) true, "
"width = (int) 16, "
"depth = (int) 16"));
static GstFlowReturn sbc_dec_chain(GstPad *pad, GstBuffer *buffer)
{
GstSbcDec *dec = GST_SBC_DEC(gst_pad_get_parent(pad));
GstFlowReturn res = GST_FLOW_OK;
guint size, codesize, offset = 0;
guint8 *data;
GstClockTime timestamp;
codesize = sbc_get_codesize(&dec->sbc);
timestamp = GST_BUFFER_TIMESTAMP(buffer);
if (dec->buffer) {
GstBuffer *temp = buffer;
buffer = gst_buffer_span(dec->buffer, 0, buffer,
GST_BUFFER_SIZE(dec->buffer) + GST_BUFFER_SIZE(buffer));
gst_buffer_unref(temp);
gst_buffer_unref(dec->buffer);
dec->buffer = NULL;
}
data = GST_BUFFER_DATA(buffer);
size = GST_BUFFER_SIZE(buffer);
while (offset < size) {
GstBuffer *output;
GstPadTemplate *template;
GstCaps *caps;
int consumed;
res = gst_pad_alloc_buffer_and_set_caps(dec->srcpad,
GST_BUFFER_OFFSET_NONE,
codesize, NULL, &output);
if (res != GST_FLOW_OK)
goto done;
consumed = sbc_decode(&dec->sbc, data + offset, size - offset,
GST_BUFFER_DATA(output), codesize,
NULL);
if (consumed <= 0)
break;
/* we will reuse the same caps object */
if (dec->outcaps == NULL) {
caps = gst_caps_new_simple("audio/x-raw-int",
"rate", G_TYPE_INT,
gst_sbc_parse_rate_from_sbc(
dec->sbc.frequency),
"channels", G_TYPE_INT,
gst_sbc_get_channel_number(
dec->sbc.mode),
NULL);
template = gst_static_pad_template_get(&sbc_dec_src_factory);
dec->outcaps = gst_caps_intersect(caps,
gst_pad_template_get_caps(template));
gst_caps_unref(caps);
}
gst_buffer_set_caps(output, dec->outcaps);
/* FIXME get a real timestamp */
GST_BUFFER_TIMESTAMP(output) = GST_CLOCK_TIME_NONE;
res = gst_pad_push(dec->srcpad, output);
if (res != GST_FLOW_OK)
goto done;
offset += consumed;
}
if (offset < size)
dec->buffer = gst_buffer_create_sub(buffer,
offset, size - offset);
done:
gst_buffer_unref(buffer);
gst_object_unref(dec);
return res;
}
static GstStateChangeReturn sbc_dec_change_state(GstElement *element,
GstStateChange transition)
{
GstSbcDec *dec = GST_SBC_DEC(element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_DEBUG("Setup subband codec");
if (dec->buffer) {
gst_buffer_unref(dec->buffer);
dec->buffer = NULL;
}
sbc_init(&dec->sbc, 0);
dec->outcaps = NULL;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_DEBUG("Finish subband codec");
if (dec->buffer) {
gst_buffer_unref(dec->buffer);
dec->buffer = NULL;
}
sbc_finish(&dec->sbc);
if (dec->outcaps) {
gst_caps_unref(dec->outcaps);
dec->outcaps = NULL;
}
break;
default:
break;
}
return parent_class->change_state(element, transition);
}
static void gst_sbc_dec_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_dec_sink_factory));
gst_element_class_add_pad_template(element_class,
gst_static_pad_template_get(&sbc_dec_src_factory));
gst_element_class_set_details(element_class, &sbc_dec_details);
}
static void gst_sbc_dec_class_init(GstSbcDecClass *klass)
{
GstElementClass *element_class = GST_ELEMENT_CLASS(klass);
parent_class = g_type_class_peek_parent(klass);
element_class->change_state = GST_DEBUG_FUNCPTR(sbc_dec_change_state);
GST_DEBUG_CATEGORY_INIT(sbc_dec_debug, "sbcdec", 0,
"SBC decoding element");
}
static void gst_sbc_dec_init(GstSbcDec *self, GstSbcDecClass *klass)
{
self->sinkpad = gst_pad_new_from_static_template(
&sbc_dec_sink_factory, "sink");
gst_pad_set_chain_function(self->sinkpad, GST_DEBUG_FUNCPTR(
sbc_dec_chain));
gst_element_add_pad(GST_ELEMENT(self), self->sinkpad);
self->srcpad = gst_pad_new_from_static_template(
&sbc_dec_src_factory, "src");
gst_element_add_pad(GST_ELEMENT(self), self->srcpad);
self->outcaps = NULL;
}
gboolean gst_sbc_dec_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "sbcdec",
GST_RANK_PRIMARY, GST_TYPE_SBC_DEC);
}
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