195 lines
6.0 KiB
C
195 lines
6.0 KiB
C
/* GStreamer
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* Copyright (C) <2006> Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <gst/rtp/gstrtpbuffer.h>
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#include <gst/video/video.h>
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#include <string.h>
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#include "gstrtpelements.h"
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#include "gstrtpmpvdepay.h"
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#include "gstrtputils.h"
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GST_DEBUG_CATEGORY_STATIC (rtpmpvdepay_debug);
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#define GST_CAT_DEFAULT (rtpmpvdepay_debug)
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/* FIXME, we set the mpeg version to 2, we should ideally be looking at contents
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* of the stream to figure out the version */
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static GstStaticPadTemplate gst_rtp_mpv_depay_src_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS
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("video/mpeg, mpegversion = (int) 2, systemstream = (boolean) FALSE")
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);
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static GstStaticPadTemplate gst_rtp_mpv_depay_sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-rtp, "
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"media = (string) \"video\", "
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"clock-rate = (int) 90000, " "encoding-name = (string) \"MPV\";"
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"application/x-rtp, "
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"media = (string) \"video\", "
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"payload = (int) " GST_RTP_PAYLOAD_MPV_STRING ", "
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"clock-rate = (int) 90000")
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);
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G_DEFINE_TYPE (GstRtpMPVDepay, gst_rtp_mpv_depay, GST_TYPE_RTP_BASE_DEPAYLOAD);
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpmpvdepay, "rtpmpvdepay",
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GST_RANK_SECONDARY, GST_TYPE_RTP_MPV_DEPAY, rtp_element_init (plugin));
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static gboolean gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload,
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GstRTPBuffer * rtp);
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static void
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gst_rtp_mpv_depay_class_init (GstRtpMPVDepayClass * klass)
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{
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GstElementClass *gstelement_class;
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GstRTPBaseDepayloadClass *gstrtpbasedepayload_class;
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gstelement_class = (GstElementClass *) klass;
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gstrtpbasedepayload_class = (GstRTPBaseDepayloadClass *) klass;
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mpv_depay_src_template);
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gst_element_class_add_static_pad_template (gstelement_class,
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&gst_rtp_mpv_depay_sink_template);
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gst_element_class_set_static_metadata (gstelement_class,
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"RTP MPEG video depayloader", "Codec/Depayloader/Network/RTP",
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"Extracts MPEG video from RTP packets (RFC 2250)",
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"Wim Taymans <wim.taymans@gmail.com>");
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gstrtpbasedepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
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gstrtpbasedepayload_class->process_rtp_packet = gst_rtp_mpv_depay_process;
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GST_DEBUG_CATEGORY_INIT (rtpmpvdepay_debug, "rtpmpvdepay", 0,
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"MPEG Video RTP Depayloader");
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}
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static void
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gst_rtp_mpv_depay_init (GstRtpMPVDepay * rtpmpvdepay)
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{
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}
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static gboolean
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gst_rtp_mpv_depay_setcaps (GstRTPBaseDepayload * depayload, GstCaps * caps)
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{
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GstStructure *structure;
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gint clock_rate;
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GstCaps *outcaps;
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gboolean res;
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structure = gst_caps_get_structure (caps, 0);
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if (!gst_structure_get_int (structure, "clock-rate", &clock_rate))
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clock_rate = 90000; /* default */
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depayload->clock_rate = clock_rate;
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outcaps = gst_caps_new_simple ("video/mpeg",
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"mpegversion", G_TYPE_INT, 2,
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"systemstream", G_TYPE_BOOLEAN, FALSE, NULL);
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res = gst_pad_set_caps (depayload->srcpad, outcaps);
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gst_caps_unref (outcaps);
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return res;
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}
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static GstBuffer *
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gst_rtp_mpv_depay_process (GstRTPBaseDepayload * depayload, GstRTPBuffer * rtp)
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{
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GstRtpMPVDepay *rtpmpvdepay;
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GstBuffer *outbuf = NULL;
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rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
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{
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gint payload_len, payload_header;
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guint8 *payload;
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guint8 T;
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payload_len = gst_rtp_buffer_get_payload_len (rtp);
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payload = gst_rtp_buffer_get_payload (rtp);
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payload_header = 0;
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if (payload_len <= 4)
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goto empty_packet;
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/* 3.4 MPEG Video-specific header
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | MBZ |T| TR | |N|S|B|E| P | | BFC | | FFC |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* AN FBV FFV
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*/
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T = (payload[0] & 0x04);
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payload_len -= 4;
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payload_header += 4;
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payload += 4;
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if (T) {
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/*
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* 3.4.1 MPEG-2 Video-specific header extension
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |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|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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if (payload_len <= 4)
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goto empty_packet;
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payload_len -= 4;
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payload_header += 4;
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payload += 4;
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}
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outbuf = gst_rtp_buffer_get_payload_subbuffer (rtp, payload_header, -1);
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if (outbuf) {
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GST_DEBUG_OBJECT (rtpmpvdepay,
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"gst_rtp_mpv_depay_chain: pushing buffer of size %" G_GSIZE_FORMAT,
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gst_buffer_get_size (outbuf));
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gst_rtp_drop_non_video_meta (rtpmpvdepay, outbuf);
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}
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}
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return outbuf;
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/* ERRORS */
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
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(NULL), ("Empty payload."));
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return NULL;
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}
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}
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