media/cast/rtp_receiver/rtp_receiver.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/cast/rtp_receiver/rtp_receiver.h"
   6
   7 #include "base/big_endian.h"
   8 #include "base/logging.h"
   9 #include "media/cast/rtp_receiver/receiver_stats.h"
  10 #include "media/cast/rtp_receiver/rtp_parser/rtp_parser.h"
  11 #include "media/cast/rtp_receiver/rtp_receiver_defines.h"
  12
  13 namespace media {
  14 namespace cast {
  15
  16 RtpReceiver::RtpReceiver(base::TickClock* clock,
  17                          const FrameReceiverConfig* audio_config,
  18                          const FrameReceiverConfig* video_config) :
  19     packet_parser_(audio_config ? audio_config->incoming_ssrc :
  20                    (video_config ? video_config->incoming_ssrc : 0),
  21                    audio_config ? audio_config->rtp_payload_type :
  22                    (video_config ? video_config->rtp_payload_type : 0)),
  23     stats_(clock) {
  24   DCHECK(audio_config || video_config);
  25 }
  26
  27 RtpReceiver::~RtpReceiver() {}
  28
  29 // static
  30 uint32 RtpReceiver::GetSsrcOfSender(const uint8* rtcp_buffer, size_t length) {
  31   DCHECK_GE(length, kMinLengthOfRtp) << "Invalid RTP packet";
  32   uint32 ssrc_of_sender;
  33   base::BigEndianReader big_endian_reader(
  34       reinterpret_cast<const char*>(rtcp_buffer), length);
  35   big_endian_reader.Skip(8);  // Skip header
  36   big_endian_reader.ReadU32(&ssrc_of_sender);
  37   return ssrc_of_sender;
  38 }
  39
  40 bool RtpReceiver::ReceivedPacket(const uint8* packet, size_t length) {
  41   RtpCastHeader rtp_header;
  42   const uint8* payload_data;
  43   size_t payload_size;
  44   if (!packet_parser_.ParsePacket(
  45           packet, length, &rtp_header, &payload_data, &payload_size)) {
  46     return false;
  47   }
  48
  49   OnReceivedPayloadData(payload_data, payload_size, rtp_header);
  50   stats_.UpdateStatistics(rtp_header);
  51   return true;
  52 }
  53
  54 }  // namespace cast
  55 }  // namespace media