decoder_provider_registry.h

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/*
 * Copyright (C) 2026 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <algorithm>
#include <memory>
#include <mutex>
#include <vector>
 
#include "cuttlefish/host/frontend/webrtc/libcommon/decoder_provider.h"
 
namespace cuttlefish {
namespace webrtc_streaming {
 
// Global registry for DecoderProvider instances. Thread-safe.
class DecoderProviderRegistry {
 public:
  static DecoderProviderRegistry& Get();
 
  // Takes ownership. Skips unavailable providers.
  void Register(std::unique_ptr<DecoderProvider> provider);
 
  // Returns available providers sorted by priority (highest first).
  std::vector<DecoderProvider*> GetProviders() const;
 
 private:
  DecoderProviderRegistry() = default;
  ~DecoderProviderRegistry() = default;
 
  DecoderProviderRegistry(const DecoderProviderRegistry&) = delete;
  DecoderProviderRegistry& operator=(const DecoderProviderRegistry&) = delete;
 
  mutable std::mutex mutex_;
  std::vector<std::unique_ptr<DecoderProvider>> providers_;
};
 
template <typename T>
class DecoderProviderRegistrar {
 public:
  DecoderProviderRegistrar() {
    DecoderProviderRegistry::Get().Register(std::make_unique<T>());
  }
};
 
#define REGISTER_DECODER_PROVIDER(ProviderClass)                   \
  static ::cuttlefish::webrtc_streaming::DecoderProviderRegistrar< \
      ProviderClass>                                               \
      g_decoder_provider_registrar_##ProviderClass
 
}  // namespace webrtc_streaming
}  // namespace cuttlefish