summaryrefslogtreecommitdiffstats
path: root/audio/gstsbcdec.c
blob: 0c7a42e48ce6b4bcf4c3d7fbb5e2539a89998592 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
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 "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) 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);

	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 *gstelement_class = GST_ELEMENT_CLASS(klass);

	parent_class = g_type_class_peek_parent(klass);

	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 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);
}