2 * Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
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.
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.
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.
24 #include <gst/rtp/gstrtpbuffer.h>
25 #include <gst/video/video.h>
28 #include "gstrtpmpvdepay.h"
29 #include "gstrtputils.h"
31 GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug);
32 #define GST_CAT_DEFAULT (rtpmpvdepay_debug)
34 /* FIXME, we set the mpeg version to 2, we should ideally be looking at contents
35 * of the stream to figure out the version */
36 static GstStaticPadTemplate gst_rtp_mpv_depay_src_template =
37 GST_STATIC_PAD_TEMPLATE ("src",
41 ("video/mpeg, mpegversion = (int) 2, systemstream = (boolean) FALSE")
44 static GstStaticPadTemplate gst_rtp_mpv_depay_sink_template =
45 GST_STATIC_PAD_TEMPLATE ("sink",
48 GST_STATIC_CAPS ("application/x-rtp, "
49 "media = (string) \"video\", "
50 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
52 "media = (string) \"video\", "
53 "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
54 "clock-rate = (int) 90000")
57 G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
59 static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
61 static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
65 gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
67 GstElementClass *gstelement_class;
68 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
70 gstelement_class = (GstElementClass *) klass;
71 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
73 gst_element_class_add_static_pad_template (gstelement_class,
74 &gst_rtp_mpv_depay_src_template);
75 gst_element_class_add_static_pad_template (gstelement_class,
76 &gst_rtp_mpv_depay_sink_template);
78 gst_element_class_set_static_metadata (gstelement_class,
79 "RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
80 "Extracts MPEG video from RTP packets (RFC 2250)",
81 "Wim Taymans <wim.taymans@gmail.com>");
83 gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
84 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mpv_depay_process;
86 GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
87 "MPEG Video RTP Depayloader");
91 gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
96 gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
98 GstStructure *structure;
103 structure = gst_caps_get_structure (caps, 0);
105 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
106 clock_rate = 90000; /* default */
107 depayload->clock_rate = clock_rate;
109 outcaps = gst_caps_new_simple ("video/mpeg",
110 "mpegversion", G_TYPE_INT, 2,
111 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
112 res = gst_pad_set_caps (depayload->srcpad, outcaps);
113 gst_caps_unref (outcaps);
119 gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
121 GstRtpMPVDepay *rtpmpvdepay;
122 GstBuffer *outbuf = NULL;
124 rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
127 gint payload_len, payload_header;
131 payload_len = gst_rtp_buffer_get_payload_len (rtp);
132 payload = gst_rtp_buffer_get_payload (rtp);
135 if (payload_len <= 4)
138 /* 3.4 MPEG Video-specific header
141 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
144 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
147 T = (payload[0] & 0x04);
155 * 3.4.1 MPEG-2 Video-specific header extension
158 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
159 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
160 * |X|E|f_[0,0]|f_[0,1]|f_[1,0]|f_[1,1]| DC| PS|T|P|C|Q|V|A|R|H|G|D|
161 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
163 if (payload_len <= 4)
171 outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, payload_header, -1);
174 GST_DEBUG_OBJECT (rtpmpvdepay,
175 "gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
176 gst_buffer_get_size (outbuf));
177 gst_rtp_drop_meta (GST_ELEMENT_CAST (rtpmpvdepay), outbuf,
178 g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
188 GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
189 (NULL), ("Empty payload."));
195 gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
197 return gst_element_register (plugin, "rtpmpvdepay",
198 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY);