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 <stdint.h>
14 #include <stdio.h>
15
16 #include <string>
17
18 #include "rtc_base/checks.h"
19 #include "rtc_base/constructor_magic.h"
20
21 namespace webrtc {
22 namespace test {
23
24 static const uint16_t kPacketHeaderSize = 8;
25 static const char kFirstLine[] = "#!rtpplay1.0 0.0.0.0/0\n";
26
27 // Write RTP packets to file in rtpdump format, as documented at:
28 // http://www.cs.columbia.edu/irt/software/rtptools/
29 class RtpDumpWriter : public RtpFileWriter {
30 public:
RtpDumpWriter(FILE * file)31 explicit RtpDumpWriter(FILE* file) : file_(file) {
32 RTC_CHECK(file_ != NULL);
33 Init();
34 }
~RtpDumpWriter()35 ~RtpDumpWriter() override {
36 if (file_ != NULL) {
37 fclose(file_);
38 file_ = NULL;
39 }
40 }
41
WritePacket(const RtpPacket * packet)42 bool WritePacket(const RtpPacket* packet) override {
43 uint16_t len = static_cast<uint16_t>(packet->length + kPacketHeaderSize);
44 uint16_t plen = static_cast<uint16_t>(packet->original_length);
45 uint32_t offset = packet->time_ms;
46 RTC_CHECK(WriteUint16(len));
47 RTC_CHECK(WriteUint16(plen));
48 RTC_CHECK(WriteUint32(offset));
49 return fwrite(packet->data, sizeof(uint8_t), packet->length, file_) ==
50 packet->length;
51 }
52
53 private:
Init()54 bool Init() {
55 fprintf(file_, "%s", kFirstLine);
56
57 RTC_CHECK(WriteUint32(0));
58 RTC_CHECK(WriteUint32(0));
59 RTC_CHECK(WriteUint32(0));
60 RTC_CHECK(WriteUint16(0));
61 RTC_CHECK(WriteUint16(0));
62
63 return true;
64 }
65
WriteUint32(uint32_t in)66 bool WriteUint32(uint32_t in) {
67 // Loop through shifts = {24, 16, 8, 0}.
68 for (int shifts = 24; shifts >= 0; shifts -= 8) {
69 uint8_t tmp = static_cast<uint8_t>((in >> shifts) & 0xFF);
70 if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
71 return false;
72 }
73 return true;
74 }
75
WriteUint16(uint16_t in)76 bool WriteUint16(uint16_t in) {
77 // Write 8 MSBs.
78 uint8_t tmp = static_cast<uint8_t>((in >> 8) & 0xFF);
79 if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
80 return false;
81 // Write 8 LSBs.
82 tmp = static_cast<uint8_t>(in & 0xFF);
83 if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
84 return false;
85 return true;
86 }
87
88 FILE* file_;
89
90 RTC_DISALLOW_COPY_AND_ASSIGN(RtpDumpWriter);
91 };
92
Create(FileFormat format,const std::string & filename)93 RtpFileWriter* RtpFileWriter::Create(FileFormat format,
94 const std::string& filename) {
95 FILE* file = fopen(filename.c_str(), "wb");
96 if (file == NULL) {
97 printf("ERROR: Can't open file: %s\n", filename.c_str());
98 return NULL;
99 }
100 switch (format) {
101 case kRtpDump:
102 return new RtpDumpWriter(file);
103 }
104 fclose(file);
105 return NULL;
106 }
107
108 } // namespace test
109 } // namespace webrtc
110