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+/*
+ * 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_DECODER_DATABASE_H_
+#define MODULES_VIDEO_CODING_DECODER_DATABASE_H_
+
+#include <stdint.h>
+
+#include <map>
+
+#include "absl/types/optional.h"
+#include "api/video_codecs/video_decoder.h"
+#include "modules/video_coding/encoded_frame.h"
+#include "modules/video_coding/generic_decoder.h"
+
+namespace webrtc {
+
+class VCMDecoderDataBase {
+ public:
+ VCMDecoderDataBase() = default;
+ VCMDecoderDataBase(const VCMDecoderDataBase&) = delete;
+ VCMDecoderDataBase& operator=(const VCMDecoderDataBase&) = delete;
+ ~VCMDecoderDataBase() = default;
+
+ bool DeregisterExternalDecoder(uint8_t payload_type);
+ void RegisterExternalDecoder(uint8_t payload_type,
+ VideoDecoder* external_decoder);
+ bool IsExternalDecoderRegistered(uint8_t payload_type) const;
+
+ void RegisterReceiveCodec(uint8_t payload_type,
+ const VideoDecoder::Settings& settings);
+ bool DeregisterReceiveCodec(uint8_t payload_type);
+
+ // Returns a decoder specified by frame.PayloadType. The decoded frame
+ // callback of the decoder is set to `decoded_frame_callback`. If no such
+ // decoder already exists an instance will be created and initialized.
+ // nullptr is returned if no decoder with the specified payload type was found
+ // and the function failed to create one.
+ VCMGenericDecoder* GetDecoder(
+ const VCMEncodedFrame& frame,
+ VCMDecodedFrameCallback* decoded_frame_callback);
+
+ private:
+ void CreateAndInitDecoder(const VCMEncodedFrame& frame);
+
+ absl::optional<uint8_t> current_payload_type_;
+ absl::optional<VCMGenericDecoder> current_decoder_;
+ // Initialization paramaters for decoders keyed by payload type.
+ std::map<uint8_t, VideoDecoder::Settings> decoder_settings_;
+ // Decoders keyed by payload type.
+ std::map<uint8_t, VideoDecoder*> decoders_;
+};
+
+} // namespace webrtc
+
+#endif // MODULES_VIDEO_CODING_DECODER_DATABASE_H_