modules/video_coding refactorings

The main purpose was the interface-> include rename, but other files
were also moved, eliminating the "main" dir.

To avoid breaking downstream, the "interface" directories were copied
into a new "video_coding/include" dir. The old headers got pragma
warnings added about deprecation (a very short deprecation since I plan
to remove them as soon downstream is updated).

Other files also moved:
video_coding/main/source -> video_coding
video_coding/main/test -> video_coding/test

BUG=webrtc:5095
TESTED=Passing compile-trybots with --clobber flag:
git cl try --clobber --bot=win_compile_rel --bot=linux_compile_rel --bot=android_compile_rel --bot=mac_compile_rel --bot=ios_rel --bot=linux_gn_rel --bot=win_x64_gn_rel --bot=mac_x64_gn_rel --bot=android_gn_rel -m tryserver.webrtc

R=stefan@webrtc.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/1417283007 .

Cr-Commit-Position: refs/heads/master@{#10694}

webrtc/modules/video_coding/receiver.h

@@ -0,0 +1,92 @@
+/*
+ *  Copyright (c) 2011 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_MODULES_VIDEO_CODING_RECEIVER_H_
+#define WEBRTC_MODULES_VIDEO_CODING_RECEIVER_H_
+
+#include "webrtc/modules/video_coding/jitter_buffer.h"
+#include "webrtc/modules/video_coding/packet.h"
+#include "webrtc/modules/video_coding/timing.h"
+#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
+#include "webrtc/modules/video_coding/include/video_coding.h"
+#include "webrtc/modules/video_coding/include/video_coding_defines.h"
+
+namespace webrtc {
+
+class Clock;
+class VCMEncodedFrame;
+
+class VCMReceiver {
+ public:
+  VCMReceiver(VCMTiming* timing,
+              Clock* clock,
+              EventFactory* event_factory);
+
+  // Using this constructor, you can specify a different event factory for the
+  // jitter buffer. Useful for unit tests when you want to simulate incoming
+  // packets, in which case the jitter buffer's wait event is different from
+  // that of VCMReceiver itself.
+  VCMReceiver(VCMTiming* timing,
+              Clock* clock,
+              rtc::scoped_ptr<EventWrapper> receiver_event,
+              rtc::scoped_ptr<EventWrapper> jitter_buffer_event);
+
+  ~VCMReceiver();
+
+  void Reset();
+  void UpdateRtt(int64_t rtt);
+  int32_t InsertPacket(const VCMPacket& packet,
+                       uint16_t frame_width,
+                       uint16_t frame_height);
+  VCMEncodedFrame* FrameForDecoding(uint16_t max_wait_time_ms,
+                                    int64_t& next_render_time_ms,
+                                    bool render_timing = true);
+  void ReleaseFrame(VCMEncodedFrame* frame);
+  void ReceiveStatistics(uint32_t* bitrate, uint32_t* framerate);
+  uint32_t DiscardedPackets() const;
+
+  // NACK.
+  void SetNackMode(VCMNackMode nackMode,
+                   int64_t low_rtt_nack_threshold_ms,
+                   int64_t high_rtt_nack_threshold_ms);
+  void SetNackSettings(size_t max_nack_list_size,
+                       int max_packet_age_to_nack,
+                       int max_incomplete_time_ms);
+  VCMNackMode NackMode() const;
+  std::vector<uint16_t> NackList(bool* request_key_frame);
+
+  // Receiver video delay.
+  int SetMinReceiverDelay(int desired_delay_ms);
+
+  // Decoding with errors.
+  void SetDecodeErrorMode(VCMDecodeErrorMode decode_error_mode);
+  VCMDecodeErrorMode DecodeErrorMode() const;
+
+  // Returns size in time (milliseconds) of complete continuous frames in the
+  // jitter buffer. The render time is estimated based on the render delay at
+  // the time this function is called.
+  int RenderBufferSizeMs();
+
+  void RegisterStatsCallback(VCMReceiveStatisticsCallback* callback);
+
+  void TriggerDecoderShutdown();
+
+ private:
+  CriticalSectionWrapper* crit_sect_;
+  Clock* const clock_;
+  VCMJitterBuffer jitter_buffer_;
+  VCMTiming* timing_;
+  rtc::scoped_ptr<EventWrapper> render_wait_event_;
+  int max_video_delay_ms_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_VIDEO_CODING_RECEIVER_H_