Add Jpeg frame writer for test support.

webrtc/test/testsupport/frame_writer.h

 /*
  *  Copyright (c) 2012 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.
  */
 
 #ifndef WEBRTC_TEST_TESTSUPPORT_FRAME_WRITER_H_
 #define WEBRTC_TEST_TESTSUPPORT_FRAME_WRITER_H_
 
 #include <stdio.h>
 
 #include <string>
 
+#include "webrtc/api/video/video_frame.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 namespace test {
 
 // Handles writing of video files.
 class FrameWriter {
  public:
   virtual ~FrameWriter() {}
 
@@ skipping 47 matching lines @@
                      int height,
                      int frame_rate);
   ~Y4mFrameWriterImpl() override;
   bool Init() override;
   bool WriteFrame(uint8_t* frame_buffer) override;
 
  private:
   const int frame_rate_;
 };
 
+// LibJpeg is not available on iOS
+#if !defined(is_ios)
+class JpegFrameWriter {
+ public:
+  JpegFrameWriter(std::string output_filename);

[sprang_webrtc, 2017/08/17 15:27:50]

nit: make parameter a const ref

[ilnik, 2017/08/18 08:42:04]

Done.

+  bool WriteFrame(const VideoFrame& input_frame, int quality);
+
+ private:
+  bool frame_written_;
+  const std::string output_filename_;
+  FILE* output_file_;
+};
+#endif
+
 }  // namespace test
 }  // namespace webrtc
 
 #endif  // WEBRTC_TEST_TESTSUPPORT_FRAME_WRITER_H_