Complete vidoe capture with webrtc natvie api, and a simple Gtk UI.

Must be complie with Webrtc

compile with gn command:

  rtc_executable("peer_test") {
    testonly = true
    sources = [
    "peerconnection/peer_test/peerconnectionimpl.cc",
    "peerconnection/peer_test/peerconnectionimpl.h",
    "peerconnection/peer_test/main.cc",
    ]
    if (!build_with_chromium && is_clang) {
      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
    }
    deps = [
      "../api:libjingle_peerconnection_api",
      "../api/video:video_frame_i420",
      "../rtc_base:checks",
      "../rtc_base:stringutils",
      "../rtc_base/third_party/sigslot",
      "../system_wrappers:field_trial",
      "../test:field_trial",
    ]
    sources += [
      "peerconnection/peer_test/linux/main_wnd.cc",
      "peerconnection/peer_test/linux/main_wnd.h",
    ]
    cflags = [ "-Wno-deprecated-declarations" ]
    libs = [
      "X11",
      "Xcomposite",
      "Xext",
      "Xrender",
    ]
    deps += [ "//build/config/linux/gtk" ]
    deps += [
      "../api:libjingle_peerconnection_api",
      "../api/audio_codecs:builtin_audio_decoder_factory",
      "../api/audio_codecs:builtin_audio_encoder_factory",
      "../api/video:video_frame",
      "../api/video_codecs:builtin_video_decoder_factory",
      "../api/video_codecs:builtin_video_encoder_factory",
      "../media:rtc_audio_video",
      "../modules/audio_device:audio_device",
      "../modules/audio_processing:api",
      "../modules/audio_processing:audio_processing",
      "../modules/video_capture:video_capture_module",
      "../pc:libjingle_peerconnection",
      "../rtc_base:rtc_base",
      "../rtc_base:rtc_base_approved",
      "../rtc_base:rtc_json",
      "//third_party/libyuv",
    ]
  }

The original possition I play this code is in src/examples/peerconnection/peer_test, so you should change the relative path in the gn above.

Example was change from google examples

Implement withouth signal channel to exchange device description, and other complex meso it's easier to learn how the peerconnection work, and this is the essential reason why I write it.