text: //
  // Copyright (c) 2013-2021 The SRS Authors
  //
  // SPDX-License-Identifier: MIT or MulanPSL-2.0
  //
  
  #ifndef SRS_PROTOCOL_RAW_AVC_HPP
  #define SRS_PROTOCOL_RAW_AVC_HPP
  
  #include <srs_core.hpp>
  
  #include <string>
  
  #include <srs_kernel_codec.hpp>
  
  class SrsBuffer;
  
  // The raw h.264 stream, in annexb.
  class SrsRawH264Stream
  {
  public:
      SrsRawH264Stream();
      virtual ~SrsRawH264Stream();
  public:
      // Demux the stream in annexb format.
      // @param stream the input stream bytes.
      // @param pframe the output h.264 frame in stream. user should never free it.
      // @param pnb_frame the output h.264 frame size.
      virtual srs_error_t annexb_demux(SrsBuffer* stream, char** pframe, int* pnb_frame);
      // whether the frame is sps or pps.
      virtual bool is_sps(char* frame, int nb_frame);
      virtual bool is_pps(char* frame, int nb_frame);
      // Demux the sps or pps to string.
      // @param sps/pps output the sps/pps.
      virtual srs_error_t sps_demux(char* frame, int nb_frame, std::string& sps);
      virtual srs_error_t pps_demux(char* frame, int nb_frame, std::string& pps);
  public:
      // The h264 raw data to h264 packet, without flv payload header.
      // Mux the sps/pps to flv sequence header packet.
      // @param sh output the sequence header.
      virtual srs_error_t mux_sequence_header(std::string sps, std::string pps, uint32_t dts, uint32_t pts, std::string& sh);
      // The h264 raw data to h264 packet, without flv payload header.
      // Mux the ibp to flv ibp packet.
      // @param ibp output the packet.
      // @param frame_type output the frame type.
      virtual srs_error_t mux_ipb_frame(char* frame, int nb_frame, std::string& ibp);
      // Mux the avc video packet to flv video packet.
      // @param frame_type, SrsVideoAvcFrameTypeKeyFrame or SrsVideoAvcFrameTypeInterFrame.
      // @param avc_packet_type, SrsVideoAvcFrameTraitSequenceHeader or SrsVideoAvcFrameTraitNALU.
      // @param video the h.264 raw data.
      // @param flv output the muxed flv packet.
      // @param nb_flv output the muxed flv size.
      virtual srs_error_t mux_avc2flv(std::string video, int8_t frame_type, int8_t avc_packet_type, uint32_t dts, uint32_t pts, char** flv, int* nb_flv);
  };
  
  // The header of adts sample.
  struct SrsRawAacStreamCodec
  {
      // Codec level informations.
      int8_t protection_absent;
      SrsAacObjectType aac_object;
      int8_t sampling_frequency_index;
      int8_t channel_configuration;
      int16_t frame_length;
  
      // Format level, RTMP as such, informations.
      char sound_format;
      char sound_rate;
      char sound_size;
      char sound_type;
      // 0 for sh; 1 for raw data.
      int8_t aac_packet_type;
  };
  
  // The raw aac stream, in adts.
  class SrsRawAacStream
  {
  public:
      SrsRawAacStream();
      virtual ~SrsRawAacStream();
  public:
      // Demux the stream in adts format.
      // @param stream the input stream bytes.
      // @param pframe the output aac frame in stream. user should never free it.
      // @param pnb_frame the output aac frame size.
      // @param codec the output codec info.
      virtual srs_error_t adts_demux(SrsBuffer* stream, char** pframe, int* pnb_frame, SrsRawAacStreamCodec& codec);
      // Mux aac raw data to aac packet, without flv payload header.
      // Mux the aac specific config to flv sequence header packet.
      // @param sh output the sequence header.
      virtual srs_error_t mux_sequence_header(SrsRawAacStreamCodec* codec, std::string& sh);
      // Mux the aac audio packet to flv audio packet.
      // @param frame the aac raw data.
      // @param nb_frame the count of aac frame.
      // @param codec the codec info of aac.
      // @param flv output the muxed flv packet.
      // @param nb_flv output the muxed flv size.
      virtual srs_error_t mux_aac2flv(char* frame, int nb_frame, SrsRawAacStreamCodec* codec, uint32_t dts, char** flv, int* nb_flv);
  };
  
  #endif
  