Add a frame generator that allows scrolling images

webrtc/video/screenshare_loopback.cc

 /*
  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #include <stdio.h>
 
 #include <map>
 
 #include "gflags/gflags.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+#include "webrtc/base/checks.h"
 #include "webrtc/test/field_trial.h"
 #include "webrtc/test/frame_generator.h"
 #include "webrtc/test/frame_generator_capturer.h"
 #include "webrtc/test/run_test.h"
 #include "webrtc/test/testsupport/fileutils.h"
 #include "webrtc/typedefs.h"
 #include "webrtc/video/loopback.h"
 #include "webrtc/video/video_send_stream.h"
 
 namespace webrtc {
 namespace flags {
 
-// Fixed for prerecorded screenshare content.
+DEFINE_int32(width, 1850, "Video width (crops source).");
 size_t Width() {
-  return 1850;
+  return static_cast<size_t>(FLAGS_width);
 }
+
+DEFINE_int32(height, 1110, "Video height (crops source).");
 size_t Height() {
-  return 1110;
+  return static_cast<size_t>(FLAGS_height);
 }
 
 DEFINE_int32(fps, 5, "Frames per second.");
 int Fps() {
   return static_cast<int>(FLAGS_fps);
 }
 
+DEFINE_int32(slide_change_interval,
+             10,
+             "Interval (in seconds) between simulated slide changes.");
+int SlideChangeInterval() {
+  return static_cast<int>(FLAGS_slide_change_interval);
+}
+
+DEFINE_int32(
+    scroll_duration,
+    0,
+    "Duration (in seconds) during which a slide will be scrolled into place.");
+int ScrollDuration() {
+  return static_cast<int>(FLAGS_scroll_duration);
+}
+
 DEFINE_int32(min_bitrate, 50, "Minimum video bitrate.");
 size_t MinBitrate() {
   return static_cast<size_t>(FLAGS_min_bitrate);
 }
 
 DEFINE_int32(tl0_bitrate, 200, "Temporal layer 0 target bitrate.");
 size_t StartBitrate() {
   return static_cast<size_t>(FLAGS_tl0_bitrate);
 }
 
@@ skipping 78 matching lines @@
     return encoder_config;
   }
 
   test::VideoCapturer* CreateCapturer(VideoSendStream* send_stream) override {
     std::vector<std::string> slides;
     slides.push_back(test::ResourcePath("web_screenshot_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("presentation_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("photo_1850_1110", "yuv"));
     slides.push_back(test::ResourcePath("difficult_photo_1850_1110", "yuv"));
 
+    // Fixed for input resolution for prerecorded screenshare content.
+    const size_t kWidth = 1850;
+    const size_t kHeight = 1110;
+    CHECK_LE(flags::Width(), kWidth);
+    CHECK_LE(flags::Height(), kHeight);
+    CHECK_GT(flags::SlideChangeInterval(), 0);
+    const int kPauseDurationMs =
+        (flags::SlideChangeInterval() - flags::ScrollDuration()) * 1000;
+    CHECK_LE(flags::ScrollDuration(), flags::SlideChangeInterval());
+
     test::FrameGenerator* frame_generator =
-        test::FrameGenerator::CreateFromYuvFile(
-            slides, flags::Width(), flags::Height(), 10 * flags::Fps());
+        test::FrameGenerator::CreateScrollingInputFromYuvFiles(
+            Clock::GetRealTimeClock(), slides, kWidth, kHeight, flags::Width(),
+            flags::Height(), flags::ScrollDuration() * 1000, kPauseDurationMs);
+
     test::FrameGeneratorCapturer* capturer(new test::FrameGeneratorCapturer(
         clock_, send_stream->Input(), frame_generator, flags::Fps()));
     EXPECT_TRUE(capturer->Init());
     return capturer;
   }
 
   VideoCodecVP8 vp8_settings_;
 };
 
 void Loopback() {
@@ skipping 18 matching lines @@
 }  // namespace webrtc
 
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
   google::ParseCommandLineFlags(&argc, &argv, true);
   webrtc::test::InitFieldTrialsFromString(
       webrtc::flags::FLAGS_force_fieldtrials);
   webrtc::test::RunTest(webrtc::Loopback);
   return 0;
 }