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298 lines
9 KiB
C
298 lines
9 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., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-irtspparse
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* @title: 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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* ## Example launch line
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* |[
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* gst-launch-1.0 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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*
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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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GST_ELEMENT_REGISTER_DEFINE (irtspparse, "irtspparse", GST_RANK_NONE,
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GST_TYPE_IRTSP_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_static_pad_template (element_class, &sink_template);
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gst_element_class_add_static_pad_template (element_class, &src_template);
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gst_element_class_set_static_metadata (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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IRTSPParse->state = IRTSP_SEARCH_FRAME;
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IRTSPParse->current_offset = 0;
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IRTSPParse->discont = FALSE;
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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), 1);
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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 void
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gst_irtsp_set_caps_once (GstBaseParse * parse)
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{
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if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
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GstCaps *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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}
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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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static const guint frame_header_size = sizeof (guint8) * 4;
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static const guint8 frame_header_magic = 0x24;
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GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
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GstBuffer *buf = frame->buffer;
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GstMapInfo map;
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const guint8 *frame_start;
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guint8 current_channel_id;
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const guint8 *data;
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guint data_size;
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guint flushed_size;
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if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (frame->buffer,
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GST_BUFFER_FLAG_DISCONT))) {
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IRTSPParse->discont = TRUE;
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}
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gst_buffer_map (buf, &map, GST_MAP_READ);
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start:
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g_assert (map.size >= IRTSPParse->current_offset);
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data = &map.data[IRTSPParse->current_offset];
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data_size = map.size - IRTSPParse->current_offset;
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switch (IRTSPParse->state) {
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case IRTSP_SEARCH_FRAME:
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/* Use the first occurrence of 0x24 as a start of interleaved frames.
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* This 'trick' allows us to parse a dump that doesn't contain RTSP
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* handshake. It's up to user to provide the data where the first 0x24
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* is an RTSP frame */
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frame_start = memchr (data, frame_header_magic, data_size);
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if (frame_start) {
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IRTSPParse->state = IRTSP_PARSE_FRAME;
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IRTSPParse->current_offset += frame_start - data;
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goto start;
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} else {
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IRTSPParse->current_offset += data_size;
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}
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break;
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case IRTSP_PARSE_FRAME:
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if (data_size > 0 && data[0] != frame_header_magic) {
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IRTSPParse->state = IRTSP_SEARCH_FRAME;
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goto start;
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}
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if (data_size >= frame_header_size) {
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IRTSPParse->current_offset += frame_header_size;
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current_channel_id = data[1];
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IRTSPParse->frame_size = GST_READ_UINT16_BE (&data[2]);
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if (current_channel_id != IRTSPParse->target_channel_id) {
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IRTSPParse->state = IRTSP_SKIP_FRAME;
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} else {
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IRTSPParse->state = IRTSP_FLUSH_FRAME;
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}
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goto start;
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}
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break;
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case IRTSP_SKIP_FRAME:
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if (data_size >= IRTSPParse->frame_size) {
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IRTSPParse->current_offset += IRTSPParse->frame_size;
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IRTSPParse->state = IRTSP_PARSE_FRAME;
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goto start;
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}
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break;
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case IRTSP_FLUSH_FRAME:
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if (data_size >= IRTSPParse->frame_size) {
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gst_irtsp_set_caps_once (parse);
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gst_buffer_unmap (buf, &map);
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frame->out_buffer = gst_buffer_copy (frame->buffer);
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gst_buffer_resize (frame->out_buffer, IRTSPParse->current_offset,
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IRTSPParse->frame_size);
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if (G_UNLIKELY (IRTSPParse->discont)) {
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GST_BUFFER_FLAG_SET (frame->out_buffer, GST_BUFFER_FLAG_DISCONT);
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IRTSPParse->discont = FALSE;
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}
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flushed_size = IRTSPParse->current_offset + IRTSPParse->frame_size;
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IRTSPParse->current_offset = 0;
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IRTSPParse->state = IRTSP_PARSE_FRAME;
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return gst_base_parse_finish_frame (parse, frame, flushed_size);
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}
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break;
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default:
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g_assert_not_reached ();
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break;
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}
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gst_buffer_unmap (buf, &map);
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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->target_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->target_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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