1 /* 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_ 12 #define API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_ 13 14 #include <memory> 15 #include <vector> 16 17 #include "absl/types/optional.h" 18 #include "api/audio_codecs/audio_codec_pair_id.h" 19 #include "api/audio_codecs/audio_decoder.h" 20 #include "api/audio_codecs/audio_format.h" 21 #include "rtc_base/ref_count.h" 22 23 namespace webrtc { 24 25 // A factory that creates AudioDecoders. 26 class AudioDecoderFactory : public rtc::RefCountInterface { 27 public: 28 virtual std::vector<AudioCodecSpec> GetSupportedDecoders() = 0; 29 30 virtual bool IsSupportedDecoder(const SdpAudioFormat& format) = 0; 31 32 // Create a new decoder instance. The `codec_pair_id` argument is used to link 33 // encoders and decoders that talk to the same remote entity: if a 34 // AudioEncoderFactory::MakeAudioEncoder() and a 35 // AudioDecoderFactory::MakeAudioDecoder() call receive non-null IDs that 36 // compare equal, the factory implementations may assume that the encoder and 37 // decoder form a pair. (The intended use case for this is to set up 38 // communication between the AudioEncoder and AudioDecoder instances, which is 39 // needed for some codecs with built-in bandwidth adaptation.) 40 // 41 // Note: Implementations need to be robust against combinations other than 42 // one encoder, one decoder getting the same ID; such decoders must still 43 // work. 44 virtual std::unique_ptr<AudioDecoder> MakeAudioDecoder( 45 const SdpAudioFormat& format, 46 absl::optional<AudioCodecPairId> codec_pair_id) = 0; 47 }; 48 49 } // namespace webrtc 50 51 #endif // API_AUDIO_CODECS_AUDIO_DECODER_FACTORY_H_ 52