modules/rtp_rtcp/source/rtp_format_video_generic.h

/*
 *  Copyright (c) 2013 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.
 */
#ifndef MODULES_RTP_RTCP_SOURCE_RTP_FORMAT_VIDEO_GENERIC_H_
#define MODULES_RTP_RTCP_SOURCE_RTP_FORMAT_VIDEO_GENERIC_H_

#include <stdint.h>

#include <vector>

#include "api/array_view.h"
#include "modules/rtp_rtcp/source/rtp_format.h"
#include "rtc_base/constructor_magic.h"

namespace webrtc {

class RtpPacketToSend;
struct RTPVideoHeader;

namespace RtpFormatVideoGeneric {
static const uint8_t kKeyFrameBit = 0x01;
static const uint8_t kFirstPacketBit = 0x02;
// If this bit is set, there will be an extended header contained in this
// packet. This was added later so old clients will not send this.
static const uint8_t kExtendedHeaderBit = 0x04;
}  // namespace RtpFormatVideoGeneric

class RtpPacketizerGeneric : public RtpPacketizer {
 public:
  // Initialize with payload from encoder.
  // The payload_data must be exactly one encoded generic frame.
  // Packets returned by |NextPacket| will contain the generic payload header.
  RtpPacketizerGeneric(rtc::ArrayView<const uint8_t> payload,
                       PayloadSizeLimits limits,
                       const RTPVideoHeader& rtp_video_header,
                       VideoFrameType frametype);
  // Initialize with payload from encoder.
  // The payload_data must be exactly one encoded generic frame.
  // Packets returned by |NextPacket| will contain raw payload without the
  // generic payload header.
  RtpPacketizerGeneric(rtc::ArrayView<const uint8_t> payload,
                       PayloadSizeLimits limits);

  ~RtpPacketizerGeneric() override;

  size_t NumPackets() const override;

  // Get the next payload.
  // Write payload and set marker bit of the |packet|.
  // Returns true on success, false otherwise.
  bool NextPacket(RtpPacketToSend* packet) override;

 private:
  // Fills header_ and header_size_ members.
  void BuildHeader(const RTPVideoHeader& rtp_video_header,
                   VideoFrameType frame_type);

  uint8_t header_[3];
  size_t header_size_;
  rtc::ArrayView<const uint8_t> remaining_payload_;
  std::vector<int> payload_sizes_;
  std::vector<int>::const_iterator current_packet_;

  RTC_DISALLOW_COPY_AND_ASSIGN(RtpPacketizerGeneric);
};

// Depacketizer for generic codec.
class RtpDepacketizerGeneric : public RtpDepacketizer {
 public:
  // Parses the generic payload header if |generic_header_enabled| is true,
  // returns raw payload otherwise.
  explicit RtpDepacketizerGeneric(bool generic_header_enabled);
  ~RtpDepacketizerGeneric() override;

  bool Parse(ParsedPayload* parsed_payload,
             const uint8_t* payload_data,
             size_t payload_data_length) override;

 private:
  bool generic_header_enabled_;
};
}  // namespace webrtc
#endif  // MODULES_RTP_RTCP_SOURCE_RTP_FORMAT_VIDEO_GENERIC_H_