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 "gstrtpelements.h"
29 #include "gstrtpmpvdepay.h"
30 #include "gstrtputils.h"
32 GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug);
33 #define GST_CAT_DEFAULT (rtpmpvdepay_debug)
35 /* FIXME, we set the mpeg version to 2, we should ideally be looking at contents
36 * of the stream to figure out the version */
37 static GstStaticPadTemplate gst_rtp_mpv_depay_src_template =
38 GST_STATIC_PAD_TEMPLATE ("src",
42 ("video/mpeg, mpegversion = (int) 2, systemstream = (boolean) FALSE")
45 static GstStaticPadTemplate gst_rtp_mpv_depay_sink_template =
46 GST_STATIC_PAD_TEMPLATE ("sink",
49 GST_STATIC_CAPS ("application/x-rtp, "
50 "media = (string) \"video\", "
51 "clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
53 "media = (string) \"video\", "
54 "payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
55 "clock-rate = (int) 90000")
58 G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
59 GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpmpvdepay, "rtpmpvdepay",
60 GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY, rtp_element_init (plugin));
62 static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
64 static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
68 gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
70 GstElementClass *gstelement_class;
71 GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
73 gstelement_class = (GstElementClass *) klass;
74 gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
76 gst_element_class_add_static_pad_template (gstelement_class,
77 &gst_rtp_mpv_depay_src_template);
78 gst_element_class_add_static_pad_template (gstelement_class,
79 &gst_rtp_mpv_depay_sink_template);
81 gst_element_class_set_static_metadata (gstelement_class,
82 "RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
83 "Extracts MPEG video from RTP packets (RFC 2250)",
84 "Wim Taymans <wim.taymans@gmail.com>");
86 gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
87 gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mpv_depay_process;
89 GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
90 "MPEG Video RTP Depayloader");
94 gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
99 gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
101 GstStructure *structure;
106 structure = gst_caps_get_structure (caps, 0);
108 if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
109 clock_rate = 90000; /* default */
110 depayload->clock_rate = clock_rate;
112 outcaps = gst_caps_new_simple ("video/mpeg",
113 "mpegversion", G_TYPE_INT, 2,
114 "systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
115 res = gst_pad_set_caps (depayload->srcpad, outcaps);
116 gst_caps_unref (outcaps);
122 gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
124 GstRtpMPVDepay *rtpmpvdepay;
125 GstBuffer *outbuf = NULL;
127 rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
130 gint payload_len, payload_header;
134 payload_len = gst_rtp_buffer_get_payload_len (rtp);
135 payload = gst_rtp_buffer_get_payload (rtp);
138 if (payload_len <= 4)
141 /* 3.4 MPEG Video-specific header
144 * 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
145 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
146 * | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
147 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
150 T = (payload[0] & 0x04);
158 * 3.4.1 MPEG-2 Video-specific header extension
161 * 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
162 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
163 * |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|
164 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
166 if (payload_len <= 4)
174 outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, payload_header, -1);
177 GST_DEBUG_OBJECT (rtpmpvdepay,
178 "gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
179 gst_buffer_get_size (outbuf));
180 gst_rtp_drop_non_video_meta (rtpmpvdepay, outbuf);
190 GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
191 (NULL), ("Empty payload."));