text: /*
   *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #include <stdio.h>
  
  #include "webrtc/base/format_macros.h"
  #include "webrtc/base/scoped_ptr.h"
  #include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
  #include "webrtc/modules/remote_bitrate_estimator/tools/bwe_rtp.h"
  #include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
  #include "webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h"
  #include "webrtc/test/rtp_file_reader.h"
  
  class Observer : public webrtc::RemoteBitrateObserver {
   public:
    explicit Observer(webrtc::Clock* clock) : clock_(clock) {}
  
    // Called when a receive channel group has a new bitrate estimate for the
    // incoming streams.
    virtual void OnReceiveBitrateChanged(const std::vector<uint32_t>& ssrcs,
                                         uint32_t bitrate) {
      printf("[%u] Num SSRCs: %d, bitrate: %u\n",
             static_cast<uint32_t>(clock_->TimeInMilliseconds()),
             static_cast<int>(ssrcs.size()), bitrate);
    }
  
    virtual ~Observer() {}
  
   private:
    webrtc::Clock* clock_;
  };
  
  int main(int argc, char** argv) {
    webrtc::test::RtpFileReader* reader;
    webrtc::RemoteBitrateEstimator* estimator;
    webrtc::RtpHeaderParser* parser;
    std::string estimator_used;
    webrtc::SimulatedClock clock(0);
    Observer observer(&clock);
    if (!ParseArgsAndSetupEstimator(argc, argv, &clock, &observer, &reader,
                                    &parser, &estimator, &estimator_used)) {
      return -1;
    }
    rtc::scoped_ptr<webrtc::test::RtpFileReader> rtp_reader(reader);
    rtc::scoped_ptr<webrtc::RtpHeaderParser> rtp_parser(parser);
    rtc::scoped_ptr<webrtc::RemoteBitrateEstimator> rbe(estimator);
  
    // Process the file.
    int packet_counter = 0;
    int64_t next_rtp_time_ms = 0;
    int64_t first_rtp_time_ms = -1;
    int abs_send_time_count = 0;
    int ts_offset_count = 0;
    webrtc::test::RtpPacket packet;
    if (!rtp_reader->NextPacket(&packet)) {
      printf("No RTP packet found\n");
      return 0;
    }
    first_rtp_time_ms = packet.time_ms;
    packet.time_ms = packet.time_ms - first_rtp_time_ms;
    while (true) {
      if (next_rtp_time_ms <= clock.TimeInMilliseconds()) {
        if (!parser->IsRtcp(packet.data, packet.length)) {
          webrtc::RTPHeader header;
          parser->Parse(packet.data, packet.length, &header);
          if (header.extension.hasAbsoluteSendTime)
            ++abs_send_time_count;
          if (header.extension.hasTransmissionTimeOffset)
            ++ts_offset_count;
          size_t packet_length = packet.length;
          // Some RTP dumps only include the header, in which case packet.length
          // is equal to the header length. In those cases packet.original_length
          // usually contains the original packet length.
          if (packet.original_length > 0) {
            packet_length = packet.original_length;
          }
          rbe->IncomingPacket(clock.TimeInMilliseconds(),
                              packet_length - header.headerLength, header, true);
          ++packet_counter;
        }
        if (!rtp_reader->NextPacket(&packet)) {
          break;
        }
        packet.time_ms = packet.time_ms - first_rtp_time_ms;
        next_rtp_time_ms = packet.time_ms;
      }
      int64_t time_until_process_ms = rbe->TimeUntilNextProcess();
      if (time_until_process_ms <= 0) {
        rbe->Process();
      }
      int64_t time_until_next_event =
          std::min(rbe->TimeUntilNextProcess(),
                   next_rtp_time_ms - clock.TimeInMilliseconds());
      clock.AdvanceTimeMilliseconds(std::max<int64_t>(time_until_next_event, 0));
    }
    printf("Parsed %d packets\nTime passed: %" PRId64 " ms\n", packet_counter,
           clock.TimeInMilliseconds());
    printf("Estimator used: %s\n", estimator_used.c_str());
    printf("Packets with absolute send time: %d\n",
           abs_send_time_count);
    printf("Packets with timestamp offset: %d\n",
           ts_offset_count);
    printf("Packets with no extension: %d\n",
           packet_counter - ts_offset_count - abs_send_time_count);
    return 0;
  }
  