# Membrane Realtimer plugin

[![Hex.pm](https://img.shields.io/hexpm/v/membrane_realtimer_plugin.svg)](https://hex.pm/packages/membrane_realtimer_plugin)
[![API Docs](https://img.shields.io/badge/api-docs-yellow.svg?style=flat)](https://hexdocs.pm/membrane_realtimer_plugin/)
[![CircleCI](https://circleci.com/gh/membraneframework/membrane_realtimer_plugin.svg?style=svg)](https://circleci.com/gh/membraneframework/membrane_realtimer_plugin)

Membrane plugin for limiting playback speed to realtime, according to buffers' timestamps.

It is a part of [Membrane Multimedia Framework](https://membraneframework.org).

## Installation

The package can be installed by adding `membrane_realtimer_plugin` to your list of dependencies in `mix.exs`:

```elixir
def deps do
  [
    {:membrane_realtimer_plugin, "~> 0.6.0"}
  ]
end
```

## Usage

The following pipeline downloads a sample h264 video via HTTP and sends it in realtime via RTP.
It requires [RTP plugin](https://github.com/membraneframework/membrane_rtp_plugin), [RTP H264 plugin](https://github.com/membraneframework/membrane_rtp_h264_plugin) and [UDP plugin](https://github.com/membraneframework/membrane_udp_plugin) to work.

```elixir
defmodule Example.Pipeline do
  use Membrane.Pipeline

  @ssrc 1234

  @impl true
  def handle_init(_ctx, _opts) do
    structure = [
      child(:source, %Membrane.Hackney.Source{
        location: "https://membraneframework.github.io/static/samples/ffmpeg-testsrc.h264",
        hackney_opts: [follow_redirect: true]
      })
      |> child(:parser, %Membrane.H264.FFmpeg.Parser{framerate: {30, 1}, alignment: :nal})
      |> via_in(Pad.ref(:input, @ssrc), options: [payloader: Membrane.RTP.H264.Payloader])
      |> child(:rtp, Membrane.RTP.SessionBin)
      |> via_out(Pad.ref(:rtp_output, @ssrc), options: [encoding: :H264])
      |> child(:realtimer, Membrane.Realtimer)
      |> child(:sink, %Membrane.UDP.Sink{
        destination_port_no: 5000,
        destination_address: {127, 0, 0, 1}
      })
    ]

    {[spec: structure, playback: :playing], %{}}
  end
end
```

## Copyright and License

Copyright 2020, [Software Mansion](https://swmansion.com/?utm_source=git&utm_medium=readme&utm_campaign=membrane_realtimer_plugin)

[![Software Mansion](https://logo.swmansion.com/logo?color=white&variant=desktop&width=200&tag=membrane-github)](https://swmansion.com/?utm_source=git&utm_medium=readme&utm_campaign=membrane_realtimer_plugin)

Licensed under the [Apache License, Version 2.0](LICENSE)