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/*
* 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 "test/rtp_file_writer.h"
#include <cstdint>
#include <cstdio>
#include <optional>
#include <string>
#include "rtc_base/checks.h"
#include "test/rtp_file_reader.h"
namespace webrtc {
namespace test {
static const uint16_t kPacketHeaderSize = 8;
static const char kFirstLine[] = "#!rtpplay1.0 0.0.0.0/0\n";
// Write RTP packets to file in rtpdump format, as documented at:
// http://www.cs.columbia.edu/irt/software/rtptools/
class RtpDumpWriter : public RtpFileWriter {
public:
explicit RtpDumpWriter(FILE* file) : file_(file) {
RTC_CHECK(file_ != nullptr);
Init();
}
~RtpDumpWriter() override {
if (file_ != nullptr) {
fclose(file_);
file_ = nullptr;
}
}
RtpDumpWriter(const RtpDumpWriter&) = delete;
RtpDumpWriter& operator=(const RtpDumpWriter&) = delete;
bool WritePacket(const RtpPacket* packet) override {
if (!first_packet_time_) {
first_packet_time_ = packet->time_ms;
}
uint16_t len = static_cast<uint16_t>(packet->length + kPacketHeaderSize);
uint16_t plen = static_cast<uint16_t>(packet->original_length);
uint32_t offset = packet->time_ms - *first_packet_time_;
RTC_CHECK(WriteUint16(len));
RTC_CHECK(WriteUint16(plen));
RTC_CHECK(WriteUint32(offset));
return fwrite(packet->data, sizeof(uint8_t), packet->length, file_) ==
packet->length;
}
private:
bool Init() {
fprintf(file_, "%s", kFirstLine);
RTC_CHECK(WriteUint32(0));
RTC_CHECK(WriteUint32(0));
RTC_CHECK(WriteUint32(0));
RTC_CHECK(WriteUint16(0));
RTC_CHECK(WriteUint16(0));
return true;
}
bool WriteUint32(uint32_t in) {
// Loop through shifts = {24, 16, 8, 0}.
for (int shifts = 24; shifts >= 0; shifts -= 8) {
uint8_t tmp = static_cast<uint8_t>((in >> shifts) & 0xFF);
if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
return false;
}
return true;
}
bool WriteUint16(uint16_t in) {
// Write 8 MSBs.
uint8_t tmp = static_cast<uint8_t>((in >> 8) & 0xFF);
if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
return false;
// Write 8 LSBs.
tmp = static_cast<uint8_t>(in & 0xFF);
if (fwrite(&tmp, sizeof(uint8_t), 1, file_) != 1)
return false;
return true;
}
FILE* file_;
std::optional<uint32_t> first_packet_time_;
};
RtpFileWriter* RtpFileWriter::Create(FileFormat format,
const std::string& filename) {
FILE* file = fopen(filename.c_str(), "wb");
if (file == nullptr) {
printf("ERROR: Can't open file: %s\n", filename.c_str());
return nullptr;
}
switch (format) {
case kRtpDump:
return new RtpDumpWriter(file);
}
fclose(file);
return nullptr;
}
} // namespace test
} // namespace webrtc
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