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 "test/rtp_file_writer.h"
12
13 #include <stdio.h>
14
15 #include <string>
16
17 #include "rtc_base/checks.h"
18 #include "rtc_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:
RtpDumpWriter(FILE * file)30 explicit RtpDumpWriter(FILE* file) : file_(file) {
31 RTC_CHECK(file_ != NULL);
32 Init();
33 }
~RtpDumpWriter()34 virtual ~RtpDumpWriter() {
35 if (file_ != NULL) {
36 fclose(file_);
37 file_ = NULL;
38 }
39 }
40
WritePacket(const RtpPacket * packet)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:
Init()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
WriteUint32(uint32_t in)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
WriteUint16(uint16_t in)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
Create(FileFormat format,const std::string & filename)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