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/*
* 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 <optional>
#include <vector>
#include "absl/base/nullability.h"
#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/environment/environment.h"
#include "api/ref_count.h"
namespace webrtc {
// A factory that creates AudioDecoders.
class AudioDecoderFactory : public 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
// AudioEncoderFactory::Create() and a AudioDecoderFactory::Create() call
// receive non-null IDs that compare equal, the factory implementations may
// assume that the encoder and decoder form a pair. (The intended use case for
// this is to set up communication between the AudioEncoder and AudioDecoder
// instances, which is needed for some codecs with built-in bandwidth
// adaptation.)
//
// Returns null if the format isn't supported.
//
// Note: Implementations need to be robust against combinations other than
// one encoder, one decoder getting the same ID; such decoders must still
// work.
virtual absl::Nullable<std::unique_ptr<AudioDecoder>> Create(
const Environment& env,
const SdpAudioFormat& format,
std::optional<AudioCodecPairId> codec_pair_id) = 0;
};
} // namespace webrtc
#endif // API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_
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