1 /* GStreamer
2 * Copyright (C) <2008> Wim Taymans <wim.taymans@gmail.com>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #ifdef HAVE_CONFIG_H
21 # include "config.h"
22 #endif
23
24 #include <gst/rtp/gstrtpbuffer.h>
25
26 #include <string.h>
27 #include "gstrtpmp1sdepay.h"
28 #include "gstrtputils.h"
29
30 /* RtpMP1SDepay signals and args */
31 enum
32 {
33 /* FILL ME */
34 LAST_SIGNAL
35 };
36
37 enum
38 {
39 PROP_0,
40 PROP_LAST
41 };
42
43 static GstStaticPadTemplate gst_rtp_mp1s_depay_src_template =
44 GST_STATIC_PAD_TEMPLATE ("src",
45 GST_PAD_SRC,
46 GST_PAD_ALWAYS,
47 GST_STATIC_CAPS ("video/mpeg,systemstream=(boolean)true")
48 );
49
50 /* The spec says video/MP1S but I have seen streams with other/MP1S so we will
51 * allow them both */
52 static GstStaticPadTemplate gst_rtp_mp1s_depay_sink_template =
53 GST_STATIC_PAD_TEMPLATE ("sink",
54 GST_PAD_SINK,
55 GST_PAD_ALWAYS,
56 GST_STATIC_CAPS ("application/x-rtp, "
57 "media = (string) \"other\", "
58 "clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"MP1S\";"
59 "application/x-rtp, "
60 "media = (string) \"video\", "
61 "clock-rate = (int) [1, MAX ], " "encoding-name = (string) \"MP1S\"")
62 );
63
64 G_DEFINE_TYPE (GstRtpMP1SDepay, gst_rtp_mp1s_depay,
65 GST_TYPE_RTP_BASE_DEPAYLOAD);
66
67 static gboolean gst_rtp_mp1s_depay_setcaps (GstRTPBaseDepayload * depayload,
68 GstCaps * caps);
69 static GstBuffer *gst_rtp_mp1s_depay_process (GstRTPBaseDepayload * depayload,
70 GstRTPBuffer * rtp);
71
72 static void
gst_rtp_mp1s_depay_class_init(GstRtpMP1SDepayClass * klass)73 gst_rtp_mp1s_depay_class_init (GstRtpMP1SDepayClass * klass)
74 {
75 GstElementClass *gstelement_class;
76 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
77
78 gstelement_class = (GstElementClass *) klass;
79 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
80
81 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mp1s_depay_process;
82 gstrtpbasedepayload_class->set_caps = gst_rtp_mp1s_depay_setcaps;
83
84 gst_element_class_add_static_pad_template (gstelement_class,
85 &gst_rtp_mp1s_depay_src_template);
86 gst_element_class_add_static_pad_template (gstelement_class,
87 &gst_rtp_mp1s_depay_sink_template);
88
89 gst_element_class_set_static_metadata (gstelement_class,
90 "RTP MPEG1 System Stream depayloader", "Codec/Depayloader/Network/RTP",
91 "Extracts MPEG1 System Streams from RTP packets (RFC 3555)",
92 "Wim Taymans <wim.taymans@gmail.com>");
93 }
94
95 static void
gst_rtp_mp1s_depay_init(GstRtpMP1SDepay * rtpmp1sdepay)96 gst_rtp_mp1s_depay_init (GstRtpMP1SDepay * rtpmp1sdepay)
97 {
98 }
99
100 static gboolean
gst_rtp_mp1s_depay_setcaps(GstRTPBaseDepayload * depayload,GstCaps * caps)101 gst_rtp_mp1s_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
102 {
103 GstCaps *srccaps;
104 GstStructure *structure;
105 gint clock_rate;
106 gboolean res;
107
108 structure = gst_caps_get_structure (caps, 0);
109 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
110 clock_rate = 90000; /* default */
111 depayload->clock_rate = clock_rate;
112
113 srccaps = gst_caps_new_simple ("video/mpeg",
114 "systemstream", G_TYPE_BOOLEAN, TRUE, NULL);
115 res = gst_pad_set_caps (GST_RTP_BASE_DEPAYLOAD_SRCPAD (depayload), srccaps);
116 gst_caps_unref (srccaps);
117
118 return res;
119 }
120
121 static GstBuffer *
gst_rtp_mp1s_depay_process(GstRTPBaseDepayload * depayload,GstRTPBuffer * rtp)122 gst_rtp_mp1s_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
123 {
124 GstBuffer *outbuf;
125
126 outbuf = gst_rtp_buffer_get_payload_buffer (rtp);
127
128 if (outbuf) {
129 GST_DEBUG ("gst_rtp_mp1s_depay_chain: pushing buffer of size %"
130 G_GSIZE_FORMAT, gst_buffer_get_size (outbuf));
131
132 gst_rtp_drop_meta (GST_ELEMENT_CAST (depayload), outbuf, 0);
133 }
134
135 return outbuf;
136 }
137
138 gboolean
gst_rtp_mp1s_depay_plugin_init(GstPlugin * plugin)139 gst_rtp_mp1s_depay_plugin_init (GstPlugin * plugin)
140 {
141 return gst_element_register (plugin, "rtpmp1sdepay",
142 GST_RANK_SECONDARY, GST_TYPE_RTP_MP1S_DEPAY);
143 }
144