/*
 *  Copyright (c) 2016 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 API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_
#define API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_

#include <memory>
#include <vector>

#include "api/audio_codecs/audio_codec_pair_id.h"
#include "api/audio_codecs/audio_decoder.h"
#include "api/audio_codecs/audio_format.h"
#include "api/optional.h"
#include "rtc_base/refcount.h"

namespace webrtc {

// A factory that creates AudioDecoders.
// NOTE: This class is still under development and may change without notice.
class AudioDecoderFactory : public rtc::RefCountInterface {
 public:
  virtual std::vector<AudioCodecSpec> GetSupportedDecoders() = 0;

  virtual bool IsSupportedDecoder(const SdpAudioFormat& format) = 0;

  // Create a new decoder instance. The `codec_pair_id` argument is used to
  // link encoders and decoders that talk to the same remote entity; if a
  // MakeAudioEncoder() and a MakeAudioDecoder() call receive non-null IDs that
  // compare equal, the factory implementations may assume that the encoder and
  // decoder form a pair.
  //
  // Note: Implementations need to be robust against combinations other than
  // one encoder, one decoder getting the same ID; such decoders must still
  // work.
  virtual std::unique_ptr<AudioDecoder> MakeAudioDecoder(
      const SdpAudioFormat& format,
      rtc::Optional<AudioCodecPairId> codec_pair_id);

  // Deprecated version of the above.
  virtual std::unique_ptr<AudioDecoder> MakeAudioDecoder(
      const SdpAudioFormat& format);
};

}  // namespace webrtc

#endif  // API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_