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251 lines
7.3 KiB
C
251 lines
7.3 KiB
C
/* GStreamer Interleaved RTSP parser
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* Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>
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* Copyright (C) 2011 Nokia Corporation. All rights reserved.
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* Contact: Stefan Kost <stefan.kost@nokia.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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/**
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* SECTION:element-irtspparse
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* @short_description: Interleaved RTSP parser
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* @see_also: #GstPcapParse
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*
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* This is an interleaved RTSP parser that allows extracting specific
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* so-called "channels" from received interleaved (TCP) RTSP data
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* (typically extracted from some network capture).
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*
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* <refsect2>
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* <title>Example launch line</title>
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* |[
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* gst-launch-0.10 filesrc location=h264crasher.pcap ! pcapparse ! irtspparse
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* ! rtph264depay ! ffdec_h264 ! fakesink
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* ]| Read from a pcap dump file using filesrc, extract the raw TCP packets,
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* depayload and decode them.
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* </refsect2>
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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 <string.h>
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#include "gstirtspparse.h"
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#include <gst/base/gstbytereader.h>
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GST_DEBUG_CATEGORY_STATIC (irtsp_parse_debug);
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#define GST_CAT_DEFAULT irtsp_parse_debug
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enum
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{
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PROP_0,
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PROP_CHANNEL_ID
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};
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static GstStaticPadTemplate src_template = 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 ("application/x-rtp ; application/x-rtcp"));
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static GstStaticPadTemplate sink_template = 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_ANY);
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static void gst_irtsp_parse_finalize (GObject * object);
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static gboolean gst_irtsp_parse_start (GstBaseParse * parse);
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static gboolean gst_irtsp_parse_stop (GstBaseParse * parse);
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static GstFlowReturn gst_irtsp_parse_handle_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, gint * skipsize);
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static void gst_irtsp_parse_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec);
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static void gst_irtsp_parse_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec);
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#define parent_class gst_irtsp_parse_parent_class
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G_DEFINE_TYPE (GstIRTSPParse, gst_irtsp_parse, GST_TYPE_BASE_PARSE);
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static void
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gst_irtsp_parse_class_init (GstIRTSPParseClass * klass)
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{
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GstBaseParseClass *parse_class = GST_BASE_PARSE_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GST_DEBUG_CATEGORY_INIT (irtsp_parse_debug, "irtspparse", 0,
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"Interleaved RTSP stream parser");
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object_class->finalize = gst_irtsp_parse_finalize;
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object_class->set_property = gst_irtsp_parse_set_property;
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object_class->get_property = gst_irtsp_parse_get_property;
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g_object_class_install_property (object_class, PROP_CHANNEL_ID,
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g_param_spec_int ("channel-id", "channel-id",
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"Channel Identifier", 0, 255,
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0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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parse_class->start = GST_DEBUG_FUNCPTR (gst_irtsp_parse_start);
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parse_class->stop = GST_DEBUG_FUNCPTR (gst_irtsp_parse_stop);
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parse_class->handle_frame = GST_DEBUG_FUNCPTR (gst_irtsp_parse_handle_frame);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details_simple (element_class, "IRTSPParse",
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"Raw/Parser",
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"Parses a raw interleaved RTSP stream",
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"Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>");
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}
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static void
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gst_irtsp_parse_reset (GstIRTSPParse * IRTSPParse)
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{
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}
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static void
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gst_irtsp_parse_init (GstIRTSPParse * IRTSPParse)
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{
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gst_base_parse_set_min_frame_size (GST_BASE_PARSE (IRTSPParse), 4);
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gst_irtsp_parse_reset (IRTSPParse);
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}
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static void
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gst_irtsp_parse_finalize (GObject * object)
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{
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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gst_irtsp_parse_start (GstBaseParse * parse)
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{
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GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
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GST_DEBUG_OBJECT (parse, "starting");
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gst_irtsp_parse_reset (IRTSPParse);
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return TRUE;
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}
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static gboolean
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gst_irtsp_parse_stop (GstBaseParse * parse)
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{
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GST_DEBUG_OBJECT (parse, "stopping");
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return TRUE;
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}
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static GstFlowReturn
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gst_irtsp_parse_handle_frame (GstBaseParse * parse,
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GstBaseParseFrame * frame, gint * skipsize)
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{
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GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
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GstBuffer *buf = frame->buffer;
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GstByteReader reader;
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gint off;
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GstMapInfo map;
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gboolean ret = FALSE;
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guint framesize;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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if (G_UNLIKELY (map.size < 4))
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goto exit;
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gst_byte_reader_init (&reader, map.data, map.size);
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off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffff0000,
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0x24000000 + (IRTSPParse->channel_id << 16), 0, map.size);
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GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
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/* didn't find anything that looks like a sync word, skip */
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if (off < 0) {
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*skipsize = map.size - 3;
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goto exit;
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}
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/* possible frame header, but not at offset 0? skip bytes before sync */
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if (off > 0) {
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*skipsize = off;
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goto exit;
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}
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framesize = GST_READ_UINT16_BE (map.data + 2) + 4;
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GST_LOG_OBJECT (parse, "got frame size %d", framesize);
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ret = TRUE;
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if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
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GstCaps *caps;
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caps = gst_caps_new_empty_simple ("application/x-rtp");
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gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
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gst_caps_unref (caps);
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}
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exit:
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gst_buffer_unmap (buf, &map);
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if (ret && framesize <= map.size) {
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/* HACK HACK skip header.
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* could also ask baseparse to skip this,
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* but that would give us a discontinuity for free
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* which is a bit too much to have on all our packets */
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frame->out_buffer = gst_buffer_copy (frame->buffer);
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gst_buffer_resize (frame->out_buffer, 4, -1);
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GST_BUFFER_FLAG_UNSET (frame->out_buffer, GST_BUFFER_FLAG_DISCONT);
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return gst_base_parse_finish_frame (parse, frame, framesize);
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}
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return GST_FLOW_OK;
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}
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static void
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gst_irtsp_parse_set_property (GObject * object,
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guint prop_id, const GValue * value, GParamSpec * pspec)
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{
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GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (object);
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switch (prop_id) {
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case PROP_CHANNEL_ID:
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IRTSPParse->channel_id = g_value_get_int (value);
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break;
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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_irtsp_parse_get_property (GObject * object,
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guint prop_id, GValue * value, GParamSpec * pspec)
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{
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GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (object);
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switch (prop_id) {
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case PROP_CHANNEL_ID:
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g_value_set_int (value, IRTSPParse->channel_id);
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break;
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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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