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      1 /*
      2  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
     11 
     12 #include "webrtc/base/scoped_ptr.h"
     13 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extension.h"
     14 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
     15 #include "webrtc/system_wrappers/include/critical_section_wrapper.h"
     16 
     17 namespace webrtc {
     18 
     19 class RtpHeaderParserImpl : public RtpHeaderParser {
     20  public:
     21   RtpHeaderParserImpl();
     22   virtual ~RtpHeaderParserImpl() {}
     23 
     24   bool Parse(const uint8_t* packet,
     25              size_t length,
     26              RTPHeader* header) const override;
     27 
     28   bool RegisterRtpHeaderExtension(RTPExtensionType type, uint8_t id) override;
     29 
     30   bool DeregisterRtpHeaderExtension(RTPExtensionType type) override;
     31 
     32  private:
     33   rtc::scoped_ptr<CriticalSectionWrapper> critical_section_;
     34   RtpHeaderExtensionMap rtp_header_extension_map_ GUARDED_BY(critical_section_);
     35 };
     36 
     37 RtpHeaderParser* RtpHeaderParser::Create() {
     38   return new RtpHeaderParserImpl;
     39 }
     40 
     41 RtpHeaderParserImpl::RtpHeaderParserImpl()
     42     : critical_section_(CriticalSectionWrapper::CreateCriticalSection()) {}
     43 
     44 bool RtpHeaderParser::IsRtcp(const uint8_t* packet, size_t length) {
     45   RtpUtility::RtpHeaderParser rtp_parser(packet, length);
     46   return rtp_parser.RTCP();
     47 }
     48 
     49 bool RtpHeaderParserImpl::Parse(const uint8_t* packet,
     50                                 size_t length,
     51                                 RTPHeader* header) const {
     52   RtpUtility::RtpHeaderParser rtp_parser(packet, length);
     53   memset(header, 0, sizeof(*header));
     54 
     55   RtpHeaderExtensionMap map;
     56   {
     57     CriticalSectionScoped cs(critical_section_.get());
     58     rtp_header_extension_map_.GetCopy(&map);
     59   }
     60 
     61   const bool valid_rtpheader = rtp_parser.Parse(header, &map);
     62   if (!valid_rtpheader) {
     63     return false;
     64   }
     65   return true;
     66 }
     67 
     68 bool RtpHeaderParserImpl::RegisterRtpHeaderExtension(RTPExtensionType type,
     69                                                      uint8_t id) {
     70   CriticalSectionScoped cs(critical_section_.get());
     71   return rtp_header_extension_map_.Register(type, id) == 0;
     72 }
     73 
     74 bool RtpHeaderParserImpl::DeregisterRtpHeaderExtension(RTPExtensionType type) {
     75   CriticalSectionScoped cs(critical_section_.get());
     76   return rtp_header_extension_map_.Deregister(type) == 0;
     77 }
     78 }  // namespace webrtc
     79