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299 lines
8 KiB
C
299 lines
8 KiB
C
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/* GStreamer
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* Copyright (C) <2006> Wim Taymans <wim@fluendo.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 <string.h>
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#include "gstrtpmpvdepay.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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/* elementfactory information */
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static const GstElementDetails gst_rtp_mpvdepay_details =
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GST_ELEMENT_DETAILS ("RTP packet depayloader",
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"Codec/Depayloader/Network",
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"Extracts MPEG video from RTP packets (RFC 2250)",
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"Wim Taymans <wim@fluendo.com>");
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/* RtpMPVDepay signals and args */
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enum
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{
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/* FILL ME */
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LAST_SIGNAL
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};
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enum
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{
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ARG_0,
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};
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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 ("video/mpeg")
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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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GST_BOILERPLATE (GstRtpMPVDepay, gst_rtp_mpv_depay, GstBaseRTPDepayload,
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GST_TYPE_BASE_RTP_DEPAYLOAD);
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static gboolean gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload,
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GstCaps * caps);
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static GstBuffer *gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload,
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GstBuffer * buf);
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static void gst_rtp_mpv_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_rtp_mpv_depay_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static GstStateChangeReturn gst_rtp_mpv_depay_change_state (GstElement *
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element, GstStateChange transition);
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static void
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gst_rtp_mpv_depay_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_mpv_depay_src_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&gst_rtp_mpv_depay_sink_template));
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gst_element_class_set_details (element_class, &gst_rtp_mpvdepay_details);
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}
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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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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->set_property = gst_rtp_mpv_depay_set_property;
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gobject_class->get_property = gst_rtp_mpv_depay_get_property;
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gstelement_class->change_state = gst_rtp_mpv_depay_change_state;
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gstbasertpdepayload_class->set_caps = gst_rtp_mpv_depay_setcaps;
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gstbasertpdepayload_class->process = 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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GstRtpMPVDepayClass * klass)
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{
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}
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static gboolean
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gst_rtp_mpv_depay_setcaps (GstBaseRTPDepayload * depayload, GstCaps * caps)
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{
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GstStructure *structure;
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GstRtpMPVDepay *rtpmpvdepay;
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gint clock_rate = 90000; /* default */
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rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "clock-rate", &clock_rate);
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depayload->clock_rate = clock_rate;
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return TRUE;
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}
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static GstBuffer *
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gst_rtp_mpv_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
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{
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GstRtpMPVDepay *rtpmpvdepay;
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GstBuffer *outbuf;
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rtpmpvdepay = GST_RTP_MPV_DEPAY (depayload);
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if (!gst_rtp_buffer_validate (buf))
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goto bad_packet;
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{
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gint payload_len;
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guint8 *payload;
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guint8 T;
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guint32 timestamp;
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payload_len = gst_rtp_buffer_get_payload_len (buf);
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payload = gst_rtp_buffer_get_payload (buf);
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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 += 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 += 4;
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}
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timestamp = gst_rtp_buffer_get_timestamp (buf);
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outbuf = gst_buffer_new_and_alloc (payload_len);
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memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
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GST_DEBUG_OBJECT (rtpmpvdepay,
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"gst_rtp_mpv_depay_chain: pushing buffer of size %d",
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GST_BUFFER_SIZE (outbuf));
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return outbuf;
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}
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return NULL;
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bad_packet:
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{
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GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
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("Packet did not validate."), (NULL));
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return NULL;
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}
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#if 0
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bad_payload:
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{
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GST_DEBUG_OBJECT (rtpmpvdepay, "Unexpected payload type %u", pt);
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return NULL;
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}
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#endif
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empty_packet:
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{
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GST_ELEMENT_WARNING (rtpmpvdepay, STREAM, DECODE,
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("Empty payload."), (NULL));
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return NULL;
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}
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}
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static void
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gst_rtp_mpv_depay_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstRtpMPVDepay *rtpmpvdepay;
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rtpmpvdepay = GST_RTP_MPV_DEPAY (object);
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_rtp_mpv_depay_get_property (GObject * object, guint prop_id, GValue * value,
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GParamSpec * pspec)
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{
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GstRtpMPVDepay *rtpmpvdepay;
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rtpmpvdepay = GST_RTP_MPV_DEPAY (object);
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switch (prop_id) {
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static GstStateChangeReturn
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gst_rtp_mpv_depay_change_state (GstElement * element, GstStateChange transition)
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{
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GstRtpMPVDepay *rtpmpvdepay;
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GstStateChangeReturn ret;
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rtpmpvdepay = GST_RTP_MPV_DEPAY (element);
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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switch (transition) {
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case GST_STATE_CHANGE_READY_TO_NULL:
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break;
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default:
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break;
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}
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return ret;
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}
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gboolean
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gst_rtp_mpv_depay_plugin_init (GstPlugin * plugin)
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{
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return gst_element_register (plugin, "rtpmpvdepay",
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GST_RANK_MARGINAL, GST_TYPE_RTP_MPV_DEPAY);
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}
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