gstreamer/ext/sbc/gstsbcdec.c

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/*
*
* 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
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#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>");
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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) [ 6000, 48000 ], "
"channels = (int) [ 1, 2 ], "
"endianness = (int) BYTE_ORDER, "
"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, offset = 0;
guint8 *data;
GstClockTime timestamp;
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, *temp;
int consumed;
consumed = sbc_decode (&dec->sbc, data + offset, size - offset);
if (consumed <= 0)
break;
caps = gst_caps_new_simple ("audio/x-raw-int",
"rate", G_TYPE_INT, dec->sbc.rate,
"channels", G_TYPE_INT, dec->sbc.channels, NULL);
template = gst_static_pad_template_get (&sbc_dec_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 (dec->srcpad,
GST_BUFFER_OFFSET_NONE, dec->sbc.len, temp, &output);
gst_caps_unref (temp);
if (res != GST_FLOW_OK)
goto done;
memcpy (GST_BUFFER_DATA (output), dec->sbc.data, dec->sbc.len);
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);
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);
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);
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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)
{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
parent_class = g_type_class_peek_parent (klass);
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (sbc_dec_change_state);
GST_DEBUG_CATEGORY_INIT (sbc_dec_debug, "sbcdec", 0, "SBC decoding element");
}
static void
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gst_sbc_dec_init (GstSbcDec * self, GstSbcDecClass * klass)
{
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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);
}