RTSP APIs

RTSP Client

The RtspClient class provides an interface to an RTSP server. It is used to send RTSP requests and receive RTSP responses. It also provides an interface to the RTP and RTCP sessions that are created as a result of the RTSP interactions.

The RtspClient currently only supports MJPEG streams, since the ESP32 does not have a hardware decoder for H.264 or H.265.

Additionally the client currently only supports UDP transport for RTP and RTCP packets. TCP transport is not supported.

The user can register a callback function to be notified when new, complete JPEG frames are received. The callback function is called with a pointer to the JPEG frame.

RTSP Server

The RtspServer class provides an implementation of an RTSP server. It is used to receive RTSP requests and send RTSP responses. It is designed to allow the user to send JPEG frames to the server, which will then send them to the client over RTP/UDP.

The server currently only supports MJPEG streams, since the ESP32 does not have a hardware encoder for H.264 or H.265.

Additionally, the server currently only supports UDP transport for RTP and RTCP packets. TCP transport is not supported.

RTSP Example
- How to use example
- Example Output

API Reference

Header File

components/rtsp/include/rtsp_client.hpp

Classes

class RtspClient : public espp::BaseComponent 

A class for interacting with an RTSP server using RTP and RTCP over UDP

This class is used to connect to an RTSP server and receive JPEG frames over RTP. It uses the TCP socket to send RTSP requests and receive RTSP responses. It uses the UDP socket to receive RTP and RTCP packets.

The RTSP client is designed to be used with the RTSP server in the [camera-streamer]https://github.com/esp-cpp/camera-streamer) project, but it should work with any RTSP server that sends JPEG frames over RTP.

Example

  espp::RtspClient rtsp_client({
      .server_address = ip_address, // string of the form {}.{}.{}.{}
      .rtsp_port = CONFIG_RTSP_SERVER_PORT,
      .path = "/mjpeg/1",
      .on_jpeg_frame =
          [](std::unique_ptr<espp::JpegFrame> jpeg_frame) {
            fmt::print("Got JPEG frame of size {}x{}\n", jpeg_frame->get_width(),
                       jpeg_frame->get_height());
          },
      .log_level = espp::Logger::Verbosity::ERROR,
  });

  std::error_code ec;

  do {
    // clear the error code
    ec.clear();
    rtsp_client.connect(ec);
    if (ec) {
      logger.error("Error connecting to server: {}", ec.message());
      logger.info("Retrying in 1s...");
      std::this_thread::sleep_for(1s);
    }
  } while (ec);

  rtsp_client.describe(ec);
  if (ec) {
    logger.error("Error describing server: {}", ec.message());
  }

  rtsp_client.setup(ec);
  if (ec) {
    logger.error("Error setting up server: {}", ec.message());
  }

  rtsp_client.play(ec);
  if (ec) {
    logger.error("Error playing server: {}", ec.message());
  }

Public Types

using jpeg_frame_callback_t = std::function<void(std::unique_ptr<JpegFrame> jpeg_frame)>: Function type for the callback to call when a JPEG frame is received.

Public Functions

explicit RtspClient(const Config &config)

Constructor

Parameters: config – The configuration for the RTSP client

~RtspClient(): Destructor Disconnects from the RTSP server

std::string send_request(const std::string &method, const std::string &path, const std::unordered_map<std::string, std::string> &extra_headers, std::error_code &ec)

Send an RTSP request to the server

Note

This is a blocking call

Note

This will parse the response and set the session ID if it is present in the response. If the response is not a 200 OK, then an error code will be set and the response will be returned. If the response is a 200 OK, then the response will be returned and the error code will be set to success.

Parameters

method – The method to use for connecting. Options are “OPTIONS”, “DESCRIBE”, “SETUP”, “PLAY”, and “TEARDOWN”
path – The path to the RTSP stream on the server.
extra_headers – Any extra headers to send with the request. These will be added to the request after the CSeq and Session headers. The key is the header name and the value is the header value. For example, {“Accept”: “application/sdp”} will add “Accept: application/sdp” to the request. The “User-Agent” header will be added automatically. The “CSeq” and “Session” headers will be added automatically. The “Accept” header will be added automatically. The “Transport” header will be added automatically for the “SETUP” method. Defaults to an empty map.
ec – The error code to set if an error occurs

Returns

The response from the server

void connect(std::error_code &ec)

Connect to the RTSP server Connects to the RTSP server and sends the OPTIONS request.

Parameters: ec – The error code to set if an error occurs

void disconnect(std::error_code &ec)

Disconnect from the RTSP server Disconnects from the RTSP server and sends the TEARDOWN request.

Parameters: ec – The error code to set if an error occurs

void describe(std::error_code &ec)

Describe the RTSP stream Sends the DESCRIBE request to the RTSP server and parses the response.

Parameters: ec – The error code to set if an error occurs

void setup(std::error_code &ec)

Setup the RTSP stream

Note

Starts the RTP and RTCP threads. Sends the SETUP request to the RTSP server and parses the response.

Note

The default ports are 5000 and 5001 for RTP and RTCP respectively.

Parameters: ec – The error code to set if an error occurs

void setup(size_t rtp_port, size_t rtcp_port, std::error_code &ec)

Setup the RTSP stream Sends the SETUP request to the RTSP server and parses the response.

Note

Starts the RTP and RTCP threads.

Parameters

rtp_port – The RTP client port
rtcp_port – The RTCP client port
ec – The error code to set if an error occurs

void play(std::error_code &ec)

Play the RTSP stream Sends the PLAY request to the RTSP server and parses the response.

Parameters: ec – The error code to set if an error occurs

void pause(std::error_code &ec)

Pause the RTSP stream Sends the PAUSE request to the RTSP server and parses the response.

Parameters: ec – The error code to set if an error occurs

void teardown(std::error_code &ec)

Teardown the RTSP stream Sends the TEARDOWN request to the RTSP server and parses the response.

Parameters: ec – The error code to set if an error occurs

inline const std::string &get_name() const

Get the name of the component

Note

This is the tag of the logger

Returns: A const reference to the name of the component

inline void set_log_tag(const std::string_view &tag)

Set the tag for the logger

Parameters: tag – The tag to use for the logger

inline espp::Logger::Verbosity get_log_level() const

Get the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Returns: The verbosity level of the logger

inline void set_log_level(espp::Logger::Verbosity level)

Set the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Parameters: level – The verbosity level to use for the logger

inline void set_log_verbosity(espp::Logger::Verbosity level)

Set the log verbosity for the logger

See also

set_log_level

See also

Logger::Verbosity

See also

Logger::set_verbosity

Note

This is a convenience method that calls set_log_level

Parameters: level – The verbosity level to use for the logger

inline espp::Logger::Verbosity get_log_verbosity() const

Get the log verbosity for the logger

See also

get_log_level

See also

Logger::Verbosity

See also

Logger::get_verbosity

Note

This is a convenience method that calls get_log_level

Returns: The verbosity level of the logger

inline void set_log_rate_limit(std::chrono::duration<float> rate_limit)

Set the rate limit for the logger

See also

Logger::set_rate_limit

Note

Only calls to the logger that have _rate_limit suffix will be rate limited

Parameters: rate_limit – The rate limit to use for the logger

struct Config

Configuration for the RTSP client.

Public Members

std::string server_address: The server IP Address to connect to.

int rtsp_port = {8554}: The port of the RTSP server.

std::string path = {"/mjpeg/1"}: The path to the RTSP stream on the server. Will be appended to the server address and port to form the full path of the form “rtsp://<server_address>:<rtsp_port><path>”

espp::RtspClient::jpeg_frame_callback_t on_jpeg_frame: The callback to call when a JPEG frame is received.

espp::Logger::Verbosity log_level = espp::Logger::Verbosity::INFO : The verbosity of the logger.

Header File

components/rtsp/include/rtsp_server.hpp

Classes

class RtspServer : public espp::BaseComponent 

Class for streaming MJPEG data from a camera using RTSP + RTP Starts a TCP socket to listen for RTSP connections, and then spawns off a new RTSP session for each connection.

See also

RtspSession

example

  const int server_port = CONFIG_RTSP_SERVER_PORT;
  const std::string server_uri = fmt::format("rtsp://{}:{}/mjpeg/1", ip_address, server_port);

  logger.info("Starting RTSP Server on port {}", server_port);
  logger.info("RTSP URI: {}", server_uri);

  espp::RtspServer rtsp_server({
      .server_address = ip_address,
      .port = server_port,
      .path = "/mjpeg/1",
      .log_level = espp::Logger::Verbosity::INFO,
  });
  rtsp_server.start();

  espp::JpegFrame jpeg_frame(jpeg_data, sizeof(jpeg_data));

  logger.info("Parsed JPEG image, num bytes: {}", jpeg_frame.get_data().size());
  logger.info("Created frame of size {}x{}", jpeg_frame.get_width(), jpeg_frame.get_height());
  rtsp_server.send_frame(jpeg_frame);

Note

This class does not currently send RTCP packets

Public Functions

explicit RtspServer(const Config &config)

Construct an RTSP server.

Parameters: config – The configuration for the RTSP server

~RtspServer(): Destroy the RTSP server.

void set_session_log_level(espp::Logger::Verbosity log_level)

Sets the log level for the RTSP sessions created by this server.

Note

This does not affect the log level of the RTSP server itself

Note

This does not change the log level of any sessions that have already been created

Parameters: log_level – The log level to set

bool start()

Start the RTSP server Starts the accept task, session task, and binds the RTSP socket.

Returns: True if the server was started successfully, false otherwise

void stop(): Stop the FTP server Stops the accept task, session task, and closes the RTSP socket.

void send_frame(const espp::JpegFrame &frame)

Send a frame over the RTSP connection Converts the full JPEG frame into a series of simplified RTP/JPEG packets and stores it to be sent over the RTP socket, but does not actually send it.

Note

Overwrites any existing frame that has not been sent

Parameters: frame – The frame to send

inline const std::string &get_name() const

Get the name of the component

Note

This is the tag of the logger

Returns: A const reference to the name of the component

inline void set_log_tag(const std::string_view &tag)

Set the tag for the logger

Parameters: tag – The tag to use for the logger

inline espp::Logger::Verbosity get_log_level() const

Get the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Returns: The verbosity level of the logger

inline void set_log_level(espp::Logger::Verbosity level)

Set the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Parameters: level – The verbosity level to use for the logger

inline void set_log_verbosity(espp::Logger::Verbosity level)

Set the log verbosity for the logger

See also

set_log_level

See also

Logger::Verbosity

See also

Logger::set_verbosity

Note

This is a convenience method that calls set_log_level

Parameters: level – The verbosity level to use for the logger

inline espp::Logger::Verbosity get_log_verbosity() const

Get the log verbosity for the logger

See also

get_log_level

See also

Logger::Verbosity

See also

Logger::get_verbosity

Note

This is a convenience method that calls get_log_level

Returns: The verbosity level of the logger

inline void set_log_rate_limit(std::chrono::duration<float> rate_limit)

Set the rate limit for the logger

See also

Logger::set_rate_limit

Note

Only calls to the logger that have _rate_limit suffix will be rate limited

Parameters: rate_limit – The rate limit to use for the logger

struct Config

Configuration for the RTSP server.

Public Members

std::string server_address: The ip address of the server.

int port: The port to listen on.

std::string path: The path to the RTSP stream.

size_t max_data_size = 1000: The maximum size of RTP packet data for the MJPEG stream. Frames will be broken up into multiple packets if they are larger than this. It seems that 1500 works well for sending, but is too large for the esp32 (camera-display) to receive properly.

espp::Logger::Verbosity log_level = espp::Logger::Verbosity::WARN : The log level for the RTSP server.

Header File

components/rtsp/include/rtsp_session.hpp

Classes

class RtspSession : public espp::BaseComponent 

Class that reepresents an RTSP session, which is uniquely identified by a session id and sends frame data over RTP and RTCP to the client

Public Functions

explicit RtspSession(std::unique_ptr<espp::TcpSocket> control_socket, const Config &config)

Construct a new RtspSession object.

Parameters

control_socket – The control socket of the session
config – The configuration of the session

~RtspSession(): Destroy the RtspSession object Stop the session task.

uint32_t get_session_id() const

Get the session id.

Returns: The session id

bool is_closed() const

Check if the session is closed.

Returns: True if the session is closed, false otherwise

bool is_connected() const

Get whether the session is connected

Returns: True if the session is connected, false otherwise

bool is_active() const

Get whether the session is active

Returns: True if the session is active, false otherwise

void play(): Mark the session as active This will cause the server to start sending frames to the client

void pause(): Pause the session This will cause the server to stop sending frames to the client

Note

This does not stop the session, it just pauses it

Note

This is useful for when the client is buffering

void teardown(): Teardown the session This will cause the server to stop sending frames to the client and close the connection

bool send_rtp_packet(const espp::RtpPacket &packet)

Send an RTP packet to the client

Parameters: packet – The RTP packet to send
Returns: True if the packet was sent successfully, false otherwise

bool send_rtcp_packet(const espp::RtcpPacket &packet)

Send an RTCP packet to the client

Parameters: packet – The RTCP packet to send
Returns: True if the packet was sent successfully, false otherwise

inline const std::string &get_name() const

Get the name of the component

Note

This is the tag of the logger

Returns: A const reference to the name of the component

inline void set_log_tag(const std::string_view &tag)

Set the tag for the logger

Parameters: tag – The tag to use for the logger

inline espp::Logger::Verbosity get_log_level() const

Get the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Returns: The verbosity level of the logger

inline void set_log_level(espp::Logger::Verbosity level)

Set the log level for the logger

See also

Logger::Verbosity

See also

Logger::set_verbosity

Parameters: level – The verbosity level to use for the logger

inline void set_log_verbosity(espp::Logger::Verbosity level)

Set the log verbosity for the logger

See also

set_log_level

See also

Logger::Verbosity

See also

Logger::set_verbosity

Note

This is a convenience method that calls set_log_level

Parameters: level – The verbosity level to use for the logger

inline espp::Logger::Verbosity get_log_verbosity() const

Get the log verbosity for the logger

See also

get_log_level

See also

Logger::Verbosity

See also

Logger::get_verbosity

Note

This is a convenience method that calls get_log_level

Returns: The verbosity level of the logger

inline void set_log_rate_limit(std::chrono::duration<float> rate_limit)

Set the rate limit for the logger

See also

Logger::set_rate_limit

Note

Only calls to the logger that have _rate_limit suffix will be rate limited

Parameters: rate_limit – The rate limit to use for the logger

struct Config

Configuration for the RTSP session.

Public Members

std::string server_address: The address of the server.

std::string rtsp_path: The RTSP path of the session.

espp::Logger::Verbosity log_level = espp::Logger::Verbosity::WARN : The log level of the session.

Header File

components/rtsp/include/rtp_packet.hpp

Classes

class RtpPacket

RtpPacket is a class to parse RTP packet. It can be used to parse and serialize RTP packets. The RTP header fields are stored in the class and can be modified. The payload is stored in the packet_ vector and can be modified.

Subclassed by espp::RtpJpegPacket

Public Functions

RtpPacket(): Construct an empty RtpPacket. The packet_ vector is empty and the header fields are set to 0.

explicit RtpPacket(size_t payload_size): Construct an RtpPacket with a payload of size payload_size. The packet_ vector is resized to RTP_HEADER_SIZE + payload_size.

explicit RtpPacket(std::string_view data)

Construct an RtpPacket from a string_view. Store the string_view in the packet_ vector and parses the header.

Parameters: data – The string_view to parse.

~RtpPacket(): Destructor.

int get_version() const

Get the RTP version.

Returns: The RTP version.

bool get_padding() const

Get the padding flag.

Returns: The padding flag.

bool get_extension() const

Get the extension flag.

Returns: The extension flag.

int get_csrc_count() const

Get the CSRC count.

Returns: The CSRC count.

bool get_marker() const

Get the marker flag.

Returns: The marker flag.

int get_payload_type() const

Get the payload type.

Returns: The payload type.

int get_sequence_number() const

Get the sequence number.

Returns: The sequence number.

int get_timestamp() const

Get the timestamp.

Returns: The timestamp.

int get_ssrc() const

Get the SSRC.

Returns: The SSRC.

void set_version(int version)

Set the RTP version.

Parameters: version – The RTP version to set.

void set_padding(bool padding)

Set the padding flag.

Parameters: padding – The padding flag to set.

void set_extension(bool extension)

Set the extension flag.

Parameters: extension – The extension flag to set.

void set_csrc_count(int csrc_count)

Set the CSRC count.

Parameters: csrc_count – The CSRC count to set.

void set_marker(bool marker)

Set the marker flag.

Parameters: marker – The marker flag to set.

void set_payload_type(int payload_type)

Set the payload type.

Parameters: payload_type – The payload type to set.

void set_sequence_number(int sequence_number)

Set the sequence number.

Parameters: sequence_number – The sequence number to set.

void set_timestamp(int timestamp)

Set the timestamp.

Parameters: timestamp – The timestamp to set.

void set_ssrc(int ssrc)

Set the SSRC.

Parameters: ssrc – The SSRC to set.

void serialize(): Serialize the RTP header.

Note

This method should be called after modifying the RTP header fields.

Note

This method does not serialize the payload. To set the payload, use set_payload(). To get the payload, use get_payload().

std::string_view get_data() const

Get a string_view of the whole packet.

Note

The string_view is valid as long as the packet_ vector is not modified.

Note

If you manually build the packet_ vector, you should make sure that you call serialize() before calling this method.

Returns: A string_view of the whole packet.

size_t get_rtp_header_size() const

Get the size of the RTP header.

Returns: The size of the RTP header.

std::string_view get_rpt_header() const

Get a string_view of the RTP header.

Returns: A string_view of the RTP header.

std::vector<uint8_t> &get_packet()

Get a reference to the packet_ vector.

Returns: A reference to the packet_ vector.

std::string_view get_payload() const

Get a string_view of the payload.

Returns: A string_view of the payload.

void set_payload(std::string_view payload)

Set the payload.

Parameters: payload – The payload to set.

Header File

components/rtsp/include/rtp_jpeg_packet.hpp

Classes

class RtpJpegPacket : public espp::RtpPacket 

RTP packet for JPEG video. The RTP payload for JPEG is defined in RFC 2435.

Public Functions

inline explicit RtpJpegPacket(std::string_view data)

Construct an RTP packet from a buffer.

Parameters: data – The buffer containing the RTP packet.

inline explicit RtpJpegPacket(const int type_specific, const int frag_type, const int q, const int width, const int height, std::string_view q0, std::string_view q1, std::string_view scan_data)

Construct an RTP packet from fields

This will construct a packet with quantization tables, so it can only be used for the first packet in a frame.

Parameters

type_specific – The type-specific field.
frag_type – The fragment type field.
q – The q field.
width – The width field.
height – The height field.
q0 – The first quantization table.
q1 – The second quantization table.
scan_data – The scan data.

inline explicit RtpJpegPacket(const int type_specific, const int offset, const int frag_type, const int q, const int width, const int height, std::string_view scan_data)

Construct an RTP packet from fields

This will construct a packet without quantization tables, so it cannot be used for the first packet in a frame.

Parameters

type_specific – The type-specific field.
offset – The offset field.
frag_type – The fragment type field.
q – The q field.
width – The width field.
height – The height field.
scan_data – The scan data.

inline int get_type_specific() const

Get the type-specific field.

Returns: The type-specific field.

inline int get_offset() const

Get the offset field.

Returns: The offset field.

inline int get_q() const

Get the fragment type field.

Returns: The fragment type field.

inline int get_width() const

Get the fragment type field.

Returns: The fragment type field.

inline int get_height() const

Get the fragment type field.

Returns: The fragment type field.

inline std::string_view get_mjpeg_header() const

Get the mjepg header.

Returns: The mjepg header.

inline bool has_q_tables() const

Get whether the packet contains quantization tables.

Note

The quantization tables are optional. If they are present, the number of quantization tables is always 2.

Note

This check is based on the value of the q field. If the q field is 128-256, the packet contains quantization tables.

Returns: Whether the packet contains quantization tables.

inline int get_num_q_tables() const

Get the number of quantization tables.

Note

The quantization tables are optional. If they are present, the number of quantization tables is always 2.

Note

Only the first packet in a frame contains quantization tables.

Returns: The number of quantization tables.

inline std::string_view get_q_table(int index) const

Get the quantization table at the specified index.

Parameters: index – The index of the quantization table.
Returns: The quantization table at the specified index.

inline std::string_view get_jpeg_data() const

Get the JPEG data. The jpeg data is the payload minus the mjpeg header and quantization tables.

Returns: The JPEG data.

int get_version() const

Get the RTP version.

Returns: The RTP version.

bool get_padding() const

Get the padding flag.

Returns: The padding flag.

bool get_extension() const

Get the extension flag.

Returns: The extension flag.

int get_csrc_count() const

Get the CSRC count.

Returns: The CSRC count.

bool get_marker() const

Get the marker flag.

Returns: The marker flag.

int get_payload_type() const

Get the payload type.

Returns: The payload type.

int get_sequence_number() const

Get the sequence number.

Returns: The sequence number.

int get_timestamp() const

Get the timestamp.

Returns: The timestamp.

int get_ssrc() const

Get the SSRC.

Returns: The SSRC.

void set_version(int version)

Set the RTP version.

Parameters: version – The RTP version to set.

void set_padding(bool padding)

Set the padding flag.

Parameters: padding – The padding flag to set.

void set_extension(bool extension)

Set the extension flag.

Parameters: extension – The extension flag to set.

void set_csrc_count(int csrc_count)

Set the CSRC count.

Parameters: csrc_count – The CSRC count to set.

void set_marker(bool marker)

Set the marker flag.

Parameters: marker – The marker flag to set.

void set_payload_type(int payload_type)

Set the payload type.

Parameters: payload_type – The payload type to set.

void set_sequence_number(int sequence_number)

Set the sequence number.

Parameters: sequence_number – The sequence number to set.

void set_timestamp(int timestamp)

Set the timestamp.

Parameters: timestamp – The timestamp to set.

void set_ssrc(int ssrc)

Set the SSRC.

Parameters: ssrc – The SSRC to set.

void serialize(): Serialize the RTP header.

Note

This method should be called after modifying the RTP header fields.

Note

This method does not serialize the payload. To set the payload, use set_payload(). To get the payload, use get_payload().

std::string_view get_data() const

Get a string_view of the whole packet.

Note

The string_view is valid as long as the packet_ vector is not modified.

Note

If you manually build the packet_ vector, you should make sure that you call serialize() before calling this method.

Returns: A string_view of the whole packet.

size_t get_rtp_header_size() const

Get the size of the RTP header.

Returns: The size of the RTP header.

std::string_view get_rpt_header() const

Get a string_view of the RTP header.

Returns: A string_view of the RTP header.

std::vector<uint8_t> &get_packet()

Get a reference to the packet_ vector.

Returns: A reference to the packet_ vector.

std::string_view get_payload() const

Get a string_view of the payload.

Returns: A string_view of the payload.

void set_payload(std::string_view payload)

Set the payload.

Parameters: payload – The payload to set.

Header File

components/rtsp/include/rtcp_packet.hpp

Classes

class RtcpPacket

A class to represent a RTCP packet.

This class is used to represent a RTCP packet. It is used as a base class for all RTCP packet types.

Note

At the moment, this class is not used.

Public Functions

RtcpPacket() = default: Constructor, default.

virtual ~RtcpPacket() = default: Destructor, default.

std::string_view get_data() const

Get the buffer of the packet.

Returns: The buffer of the packet

Header File

components/rtsp/include/jpeg_header.hpp

Classes

class JpegHeader

A class to generate a JPEG header for a given image size and quantization tables. The header is generated once and then cached for future use. The header is generated according to the JPEG standard and is compatible with the ESP32 camera driver.

Public Functions

inline explicit JpegHeader(int width, int height, std::string_view q0_table, std::string_view q1_table)

Create a JPEG header for a given image size and quantization tables.

Parameters

width – The image width in pixels.
height – The image height in pixels.
q0_table – The quantization table for the Y channel.
q1_table – The quantization table for the Cb and Cr channels.

inline explicit JpegHeader(std::string_view data): Create a JPEG header from a given JPEG header data.

inline int get_width() const

Get the image width.

Returns: The image width in pixels.

inline int get_height() const

Get the image height.

Returns: The image height in pixels.

inline std::string_view get_data() const

Get the JPEG header data.

Returns: The JPEG header data.

inline std::string_view get_quantization_table(int index) const

Get the Quantization table at the index.

Parameters: index – The index of the quantization table.
Returns: The quantization table.

Header File

components/rtsp/include/jpeg_frame.hpp

Classes

class JpegFrame

A class that represents a complete JPEG frame.

This class is used to collect the JPEG scans that are received in RTP packets and to serialize them into a complete JPEG frame.

Public Functions

inline explicit JpegFrame(const RtpJpegPacket &packet)

Construct a JpegFrame from a RtpJpegPacket.

This constructor will parse the header of the packet and add the JPEG data to the frame.

Parameters: packet – The packet to parse.

inline explicit JpegFrame(const char *data, size_t size)

Construct a JpegFrame from buffer of jpeg data

Parameters

data – The buffer containing the jpeg data.
size – The size of the buffer.

inline const JpegHeader &get_header() const

Get a reference to the header.

Returns: A reference to the header.

inline int get_width() const

Get the width of the frame.

Returns: The width of the frame.

inline int get_height() const

Get the height of the frame.

Returns: The height of the frame.

inline bool is_complete() const

Check if the frame is complete.

Returns: True if the frame is complete, false otherwise.

inline void append(const RtpJpegPacket &packet)

Append a RtpJpegPacket to the frame. This will add the JPEG data to the frame.

Parameters: packet – The packet containing the scan to append.

inline void add_scan(const RtpJpegPacket &packet)

Append a JPEG scan to the frame. This will add the JPEG data to the frame.

Note

If the packet contains the EOI marker, the frame will be finalized, and no further scans can be added.

Parameters: packet – The packet containing the scan to append.

inline std::string_view get_data() const

Get the serialized data. This will return the serialized data.

Returns: The serialized data.

inline std::string_view get_scan_data() const

Get the scan data. This will return the scan data.

Returns: The scan data.