decoder_provider.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 <memory>
#include <string>
#include <vector>
 
#include "api/video_codecs/sdp_video_format.h"
#include "api/video_codecs/video_decoder.h"
 
#include "cuttlefish/result/result.h"
 
namespace cuttlefish {
namespace webrtc_streaming {
 
// Interface for pluggable video decoder backends.
//
// Mirrors EncoderProvider. WebRTC requires matching encoder and decoder
// format support for successful SDP negotiation.
//
// Priority: 0 = software fallback, 100+ = hardware acceleration.
class DecoderProvider {
 public:
  virtual ~DecoderProvider() = default;
 
  virtual std::string GetName() const = 0;
  virtual int GetPriority() const = 0;
  virtual bool IsAvailable() const = 0;
  virtual std::vector<webrtc::SdpVideoFormat> GetSupportedFormats() const = 0;
  virtual Result<std::unique_ptr<webrtc::VideoDecoder>> CreateDecoder(
      const webrtc::SdpVideoFormat& format) const = 0;
 
  // Descending: higher priority sorts first.
  bool operator<(const DecoderProvider& other) const {
    return other.GetPriority() < GetPriority();
  }
};
 
}  // namespace webrtc_streaming
}  // namespace cuttlefish