Split VCMCodecDataBase into VCMEncoderDataBase and VCMDecoderDataBase.

Intended to ease further refactoring, cleanup and deletion in this code.

Bug: webrtc:8830
Change-Id: Ib862b073e93b67b4f8eedbbf40ad3a8354a566a2
Reviewed-on: https://webrtc-review.googlesource.com/55562
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22120}

modules/video_coding/encoder_database.h

@@ -0,0 +1,79 @@
+/*
+ *  Copyright (c) 2018 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 MODULES_VIDEO_CODING_ENCODER_DATABASE_H_
+#define MODULES_VIDEO_CODING_ENCODER_DATABASE_H_
+
+#include <memory>
+
+#include "modules/video_coding/generic_encoder.h"
+
+namespace webrtc {
+
+class VCMEncoderDataBase {
+ public:
+  explicit VCMEncoderDataBase(VCMEncodedFrameCallback* encoded_frame_callback);
+  ~VCMEncoderDataBase();
+
+  // Sets the sender side codec and initiates the desired codec given the
+  // VideoCodec struct.
+  // Returns true if the codec was successfully registered, false otherwise.
+  bool SetSendCodec(const VideoCodec* send_codec,
+                    int number_of_cores,
+                    size_t max_payload_size);
+
+  // Registers and initializes an external encoder object.
+  // |internal_source| should be set to true if the codec has an internal
+  // video source and doesn't need the user to provide it with frames via
+  // the Encode() method.
+  void RegisterExternalEncoder(VideoEncoder* external_encoder,
+                               uint8_t payload_type,
+                               bool internal_source);
+
+  // Deregisters an external encoder. Returns true if the encoder was
+  // found and deregistered, false otherwise. |was_send_codec| is set to true
+  // if the external encoder was the send codec before being deregistered.
+  bool DeregisterExternalEncoder(uint8_t payload_type, bool* was_send_codec);
+
+  VCMGenericEncoder* GetEncoder();
+
+  bool SetPeriodicKeyFrames(bool enable);
+
+  // Deregisters an external decoder object specified by |payload_type|.
+  bool DeregisterExternalDecoder(uint8_t payload_type);
+
+  // Registers an external decoder object to the payload type |payload_type|.
+  void RegisterExternalDecoder(VideoDecoder* external_decoder,
+                               uint8_t payload_type);
+
+  bool MatchesCurrentResolution(int width, int height) const;
+
+ private:
+  // Determines whether a new codec has to be created or not.
+  // Checks every setting apart from maxFramerate and startBitrate.
+  bool RequiresEncoderReset(const VideoCodec& send_codec);
+
+  void DeleteEncoder();
+
+  int number_of_cores_;
+  size_t max_payload_size_;
+  bool periodic_key_frames_;
+  bool pending_encoder_reset_;
+  VideoCodec send_codec_;
+  uint8_t encoder_payload_type_;
+  VideoEncoder* external_encoder_;
+  bool internal_source_;
+  VCMEncodedFrameCallback* const encoded_frame_callback_;
+  std::unique_ptr<VCMGenericEncoder> ptr_encoder_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_ENCODER_DATABASE_H_