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sbc: Implement full parsing support

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Marcel Holtmann 2007-08-26 13:59:05 +00:00 committed by Tim-Philipp Müller
parent 5488f2bf13
commit 85874338ff
2 changed files with 255 additions and 0 deletions
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194
ext/sbc/gstsbcparse.c Normal file
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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
#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);
}

61
ext/sbc/gstsbcparse.h Normal file
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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
*
*/
#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