pw_init()

Prototype   :

                     void pw_init(int *argc, char **argv[])

Parameter  :

                      argc - Pointer to argc

                      argv - Ponter to argv

Return Val   :

                    Void

Description :

                   It will initialize Pipewire system,parse and modify any parameters given by argc and argv.

                   This will load and configure the right modules and setup logging and other tasks.

                   Debug environment variable : export PIPEWIRE_DEBUG

pw_main_loop_new()

Prototype   :

                     struct pw_main_loop *pw_main_loop_new(const struct spa_dict *props)

Parameter  :

                    props - Pointer to properties of spa dictionary

Return Val   :

                    It will return newly allocated mail loop pointer

Description :

                  The mainloop is an abstraction of a big poll loop, waiting for events to occur and things to do. Most of the PipeWire work will actually be performed in the context of this loop.

pw_stream_new_simple()

Prototype   : 

                     struct pw_stream* pw_stream_new_simple     (     struct pw_loop *      loop,

                                                                                                  const char *      name,

                                                                                                  struct pw_properties *      props,

                                                                                                  const struct pw_stream_events *      events,

                                                                                                  void *      data 

                                                                                          )     

Parameter  : 

                    loop    - a Loop to use

                    name  - a stream media name

                    props  - stream properties, ownership is taken

                    events - stream events

                    data    - data passed to events 

Return Val   :

                    This will return a created stream object

Description :

                   This will create a stream object with different properties to make it a Camera Video Capture stream

pw_stream_connect()

Prototype   : 

                    int pw_stream_connect     (     struct pw_stream *      stream,

                                                                  enum pw_direction      direction,

                                                                  uint32_t                       target_id,

                                                                  enum pw_stream_flags      flags,

                                                                  const struct spa_pod **     params,

                                                                  uint32_t                            n_params 

                                                            )     

Parameter  : 

                    stream       - a Stream

                    direction    - the stream direction

                    target_id    - the target object id to connect to or PW_ID_ANY to let the manager select a target.

                    flags           - stream flags

                    params       - an array with params. The params should ideally contain supported formats.

                    n_params    - number of items in params

Return Val   :

                    If will return success or failure of stream connect

                    0 - Success           <0 - Error

Description :

                   It will start to connect the stream, You should connect to the process event and use pw_stream_dequeue_buffer() to get the latest metadata and data.