myvtm/Other/libvideoframework/rtp_header_extension/rtp_header_extensions.h

#ifndef MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_
#define MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_

#include <stddef.h>
#include <stdint.h>
#include <string>

#include "../rtp_header_extension/rtp_header_extension_defines.h"


class AbsoluteSendTime {
 public:
  static const RTPExtensionType kId = kRtpExtensionAbsoluteSendTime;
  static const uint8_t kValueSizeBytes = 3;

  static bool Parse(const uint8_t *data, uint32_t* time_24bits);
  static size_t ValueSize(uint32_t time_24bits) { return kValueSizeBytes; }
  static bool Write(uint8_t *data, uint32_t time_24bits);

  static const uint32_t MsTo24Bits(int64_t time_ms) {
    return static_cast<uint32_t>(((time_ms << 18) + 500) / 1000) & 0x00FFFFFF;
  }
  static const char kUri[];
};

class AudioLevel {
 public:
  static const RTPExtensionType kId = kRtpExtensionAudioLevel;
  static const uint8_t kValueSizeBytes = 1;

  static bool Parse(const uint8_t *data,
                    bool* voice_activity,
                    uint8_t* audio_level);
  static size_t ValueSize(bool voice_activity, uint8_t audio_level) {
    return kValueSizeBytes;
  }
  static bool Write(uint8_t *data,
                    bool voice_activity,
                    uint8_t audio_level);
  static const char kUri[];
};

class TransmissionOffset {
 public:
  static const RTPExtensionType kId = kRtpExtensionTransmissionTimeOffset;
  static const uint8_t kValueSizeBytes = 3;

  static bool Parse(const uint8_t *data, int32_t* rtp_time);
  static size_t ValueSize(int32_t rtp_time) { return kValueSizeBytes; }
  static bool Write(uint8_t *data, int32_t rtp_time);
  static const char kUri[];
};

class TransportSequenceNumber {
 public:
  static const RTPExtensionType kId = kRtpExtensionTransportSequenceNumber;
  static const uint8_t kValueSizeBytes = 2;

  static bool Parse(const uint8_t *data,
                    uint16_t* transport_sequence_number);
  static size_t ValueSize(uint16_t /*transport_sequence_number*/) {
    return kValueSizeBytes;
  }
  static bool Write(uint8_t *data,
                    uint16_t transport_sequence_number);
  static const char kUri[];
};


class VideoOrientation {
 public:
  static const RTPExtensionType kId = kRtpExtensionVideoRotation;
  static const uint8_t kValueSizeBytes = 1;

  static bool Parse(const uint8_t *data, VideoRotation* value);
  static size_t ValueSize(VideoRotation) { return kValueSizeBytes; }
  static bool Write(uint8_t *data, VideoRotation value);
  static bool Parse(const uint8_t *data, uint8_t* value);
  static size_t ValueSize(uint8_t value) { return kValueSizeBytes; }
  static bool Write(uint8_t *data, uint8_t value);
  static const char kUri[];
};

class PlayoutDelayLimits {
 public:
  static const RTPExtensionType kId = kRtpExtensionPlayoutDelay;
  static const uint8_t kValueSizeBytes = 3;

  // Playout delay in milliseconds. A playout delay limit (min or max)
  // has 12 bits allocated. This allows a range of 0-4095 values which
  // translates to a range of 0-40950 in milliseconds.
  static const int kGranularityMs = 10;
  // Maximum playout delay value in milliseconds.
  static const int kMaxMs = 0xfff * kGranularityMs;  // 40950.

  static bool Parse(const uint8_t *data,
                    PlayoutDelay* playout_delay);
  static size_t ValueSize(const PlayoutDelay&) {
    return kValueSizeBytes;
  }
  static bool Write(uint8_t *data,
                    const PlayoutDelay& playout_delay);
  static const char kUri[];
};

class VideoContentTypeExtension {
 public:
  static const RTPExtensionType kId = kRtpExtensionVideoContentType;
  static const uint8_t kValueSizeBytes = 1;

  static bool Parse(const uint8_t *data,
                    VideoContentType* content_type);
  static size_t ValueSize(VideoContentType) {
    return kValueSizeBytes;
  }
  static bool Write(uint8_t *data,
                    VideoContentType content_type);
  static const char kUri[];
};


// Base extension class for RTP header extensions which are strings.
// Subclasses must defined kId and kUri static constexpr members.
class BaseRtpStringExtension {
 public:
  // String RTP header extensions are limited to 16 bytes because it is the
  // maximum length that can be encoded with one-byte header extensions.
  static const uint8_t kMaxValueSizeBytes = 16;

  static bool Parse(const uint8_t *data, std::string* str);
  static size_t ValueSize(const std::string& str) { return str.size(); }
  static bool Write(uint8_t *data, const std::string& str);
};

class RtpStreamId : public BaseRtpStringExtension {
 public:
  static const RTPExtensionType kId = kRtpExtensionRtpStreamId;
  static const char kUri[];
};

class RepairedRtpStreamId : public BaseRtpStringExtension {
 public:
  static const RTPExtensionType kId = kRtpExtensionRepairedRtpStreamId;
  static const char kUri[];
};

class RtpMid : public BaseRtpStringExtension {
 public:
  static const RTPExtensionType kId = kRtpExtensionMid;
  static const char kUri[];
};

#endif  // MODULES_RTP_RTCP_SOURCE_RTP_HEADER_EXTENSIONS_H_