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
20namespace webrtc {
21namespace test {
22
23static const uint16_t kPacketHeaderSize = 8;
24static 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/
28class 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
92RtpFileWriter* 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