1 /*
2 * Opus Depayloader Gst Element
3 *
4 * @author: Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 # include "config.h"
24 #endif
25
26 #include <string.h>
27 #include <stdlib.h>
28 #include <gst/rtp/gstrtpbuffer.h>
29 #include <gst/audio/audio.h>
30 #include "gstrtpopusdepay.h"
31 #include "gstrtputils.h"
32
33 GST_DEBUG_CATEGORY_STATIC (rtpopusdepay_debug);
34 #define GST_CAT_DEFAULT (rtpopusdepay_debug)
35
36 static GstStaticPadTemplate gst_rtp_opus_depay_sink_template =
37 GST_STATIC_PAD_TEMPLATE ("sink",
38 GST_PAD_SINK,
39 GST_PAD_ALWAYS,
40 GST_STATIC_CAPS ("application/x-rtp, "
41 "media = (string) \"audio\", "
42 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ","
43 "clock-rate = (int) 48000, "
44 "encoding-name = (string) { \"OPUS\", \"X-GST-OPUS-DRAFT-SPITTKA-00\" }")
45 );
46
47 static GstStaticPadTemplate gst_rtp_opus_depay_src_template =
48 GST_STATIC_PAD_TEMPLATE ("src",
49 GST_PAD_SRC,
50 GST_PAD_ALWAYS,
51 GST_STATIC_CAPS ("audio/x-opus, channel-mapping-family = (int) 0")
52 );
53
54 static GstBuffer *gst_rtp_opus_depay_process (GstRTPBaseDepayload * depayload,
55 GstRTPBuffer * rtp_buffer);
56 static gboolean gst_rtp_opus_depay_setcaps (GstRTPBaseDepayload * depayload,
57 GstCaps * caps);
58
59 G_DEFINE_TYPE (GstRTPOpusDepay, gst_rtp_opus_depay,
60 GST_TYPE_RTP_BASE_DEPAYLOAD);
61
62 static void
gst_rtp_opus_depay_class_init(GstRTPOpusDepayClass * klass)63 gst_rtp_opus_depay_class_init (GstRTPOpusDepayClass * klass)
64 {
65 GstRTPBaseDepayloadClass *gstbasertpdepayload_class;
66 GstElementClass *element_class;
67
68 element_class = GST_ELEMENT_CLASS (klass);
69 gstbasertpdepayload_class = (GstRTPBaseDepayloadClass *) klass;
70
71 gst_element_class_add_static_pad_template (element_class,
72 &gst_rtp_opus_depay_src_template);
73 gst_element_class_add_static_pad_template (element_class,
74 &gst_rtp_opus_depay_sink_template);
75 gst_element_class_set_static_metadata (element_class,
76 "RTP Opus packet depayloader", "Codec/Depayloader/Network/RTP",
77 "Extracts Opus audio from RTP packets",
78 "Danilo Cesar Lemes de Paula <danilo.cesar@collabora.co.uk>");
79
80 gstbasertpdepayload_class->process_rtp_packet = gst_rtp_opus_depay_process;
81 gstbasertpdepayload_class->set_caps = gst_rtp_opus_depay_setcaps;
82
83 GST_DEBUG_CATEGORY_INIT (rtpopusdepay_debug, "rtpopusdepay", 0,
84 "Opus RTP Depayloader");
85 }
86
87 static void
gst_rtp_opus_depay_init(GstRTPOpusDepay * rtpopusdepay)88 gst_rtp_opus_depay_init (GstRTPOpusDepay * rtpopusdepay)
89 {
90
91 }
92
93 static gboolean
gst_rtp_opus_depay_setcaps(GstRTPBaseDepayload * depayload,GstCaps * caps)94 gst_rtp_opus_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
95 {
96 GstCaps *srccaps;
97 GstStructure *s;
98 gboolean ret;
99 const gchar *sprop_stereo, *sprop_maxcapturerate;
100
101 srccaps =
102 gst_caps_new_simple ("audio/x-opus", "channel-mapping-family", G_TYPE_INT,
103 0, NULL);
104
105 s = gst_caps_get_structure (caps, 0);
106 if ((sprop_stereo = gst_structure_get_string (s, "sprop-stereo"))) {
107 if (strcmp (sprop_stereo, "0") == 0)
108 gst_caps_set_simple (srccaps, "channels", G_TYPE_INT, 1, NULL);
109 else if (strcmp (sprop_stereo, "1") == 0)
110 gst_caps_set_simple (srccaps, "channels", G_TYPE_INT, 2, NULL);
111 else
112 GST_WARNING_OBJECT (depayload, "Unknown sprop-stereo value '%s'",
113 sprop_stereo);
114 }
115
116 if ((sprop_maxcapturerate =
117 gst_structure_get_string (s, "sprop-maxcapturerate"))) {
118 gulong rate;
119 gchar *tailptr;
120
121 rate = strtoul (sprop_maxcapturerate, &tailptr, 10);
122 if (rate > INT_MAX || *tailptr != '\0') {
123 GST_WARNING_OBJECT (depayload,
124 "Failed to parse sprop-maxcapturerate value '%s'",
125 sprop_maxcapturerate);
126 } else {
127 gst_caps_set_simple (srccaps, "rate", G_TYPE_INT, rate, NULL);
128 }
129 }
130
131 ret = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
132
133 GST_DEBUG_OBJECT (depayload,
134 "set caps on source: %" GST_PTR_FORMAT " (ret=%d)", srccaps, ret);
135 gst_caps_unref (srccaps);
136
137 depayload->clock_rate = 48000;
138
139 return ret;
140 }
141
142 static GstBuffer *
gst_rtp_opus_depay_process(GstRTPBaseDepayload * depayload,GstRTPBuffer * rtp_buffer)143 gst_rtp_opus_depay_process (GstRTPBaseDepayload * depayload,
144 GstRTPBuffer * rtp_buffer)
145 {
146 GstBuffer *outbuf;
147
148 outbuf = gst_rtp_buffer_get_payload_buffer (rtp_buffer);
149
150 gst_rtp_drop_non_audio_meta (depayload, outbuf);
151
152 return outbuf;
153 }
154
155 gboolean
gst_rtp_opus_depay_plugin_init(GstPlugin * plugin)156 gst_rtp_opus_depay_plugin_init (GstPlugin * plugin)
157 {
158 return gst_element_register (plugin, "rtpopusdepay",
159 GST_RANK_PRIMARY, GST_TYPE_RTP_OPUS_DEPAY);
160 }
161