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      1 /*
      2  *  Copyright (c) 2014 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 
     11 #include "webrtc/test/rtp_file_writer.h"
     12 
     13 #include <stdio.h>
     14 
     15 #include <string>
     16 
     17 #include "webrtc/base/checks.h"
     18 #include "webrtc/base/constructormagic.h"
     19 
     20 namespace webrtc {
     21 namespace test {
     22 
     23 static const uint16_t kPacketHeaderSize = 8;
     24 static const char kFirstLine[] = "#!rtpplay1.0 0.0.0.0/0\n";
     25 
     26 // Write RTP packets to file in rtpdump format, as documented at:
     27 // http://www.cs.columbia.edu/irt/software/rtptools/
     28 class RtpDumpWriter : public RtpFileWriter {
     29  public:
     30   explicit RtpDumpWriter(FILE* file) : file_(file) {
     31     RTC_CHECK(file_ != NULL);
     32     Init();
     33   }
     34   virtual ~RtpDumpWriter() {
     35     if (file_ != NULL) {
     36       fclose(file_);
     37       file_ = NULL;
     38     }
     39   }
     40 
     41   bool WritePacket(const RtpPacket* packet) override {
     42     uint16_t len = static_cast<uint16_t>(packet->length + kPacketHeaderSize);
     43     uint16_t plen = static_cast<uint16_t>(packet->original_length);
     44     uint32_t offset = packet->time_ms;
     45     RTC_CHECK(WriteUint16(len));
     46     RTC_CHECK(WriteUint16(plen));
     47     RTC_CHECK(WriteUint32(offset));
     48     return fwrite(packet->data, sizeof(uint8_t), packet->length, file_) ==
     49            packet->length;
     50   }
     51 
     52  private:
     53   bool Init() {
     54     fprintf(file_, "%s", kFirstLine);
     55 
     56     RTC_CHECK(WriteUint32(0));
     57     RTC_CHECK(WriteUint32(0));
     58     RTC_CHECK(WriteUint32(0));
     59     RTC_CHECK(WriteUint16(0));
     60     RTC_CHECK(WriteUint16(0));
     61 
     62     return true;
     63   }
     64 
     65   bool WriteUint32(uint32_t in) {
     66     // Loop through shifts = {24, 16, 8, 0}.
     67     for (int shifts = 24; shifts >= 0; shifts -= 8) {
     68       uint8_t tmp = static_cast<uint8_t>((in >> shifts) & 0xFF);
     69       if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
     70         return false;
     71     }
     72     return true;
     73   }
     74 
     75   bool WriteUint16(uint16_t in) {
     76     // Write 8 MSBs.
     77     uint8_t tmp = static_cast<uint8_t>((in >> 8) & 0xFF);
     78     if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
     79       return false;
     80     // Write 8 LSBs.
     81     tmp = static_cast<uint8_t>(in & 0xFF);
     82     if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
     83       return false;
     84     return true;
     85   }
     86 
     87   FILE* file_;
     88 
     89   RTC_DISALLOW_COPY_AND_ASSIGN(RtpDumpWriter);
     90 };
     91 
     92 RtpFileWriter* RtpFileWriter::Create(FileFormat format,
     93                                      const std::string& filename) {
     94   FILE* file = fopen(filename.c_str(), "wb");
     95   if (file == NULL) {
     96     printf("ERROR: Can't open file: %s\n", filename.c_str());
     97     return NULL;
     98   }
     99   switch (format) {
    100     case kRtpDump:
    101       return new RtpDumpWriter(file);
    102   }
    103   fclose(file);
    104   return NULL;
    105 }
    106 
    107 }  // namespace test
    108 }  // namespace webrtc
    109