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Diffstat (limited to 'third_party/libwebrtc/api/audio_codecs/audio_encoder_factory.h')
-rw-r--r-- | third_party/libwebrtc/api/audio_codecs/audio_encoder_factory.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/audio_codecs/audio_encoder_factory.h b/third_party/libwebrtc/api/audio_codecs/audio_encoder_factory.h new file mode 100644 index 0000000000..6128b1b6f3 --- /dev/null +++ b/third_party/libwebrtc/api/audio_codecs/audio_encoder_factory.h @@ -0,0 +1,62 @@ +/* + * Copyright (c) 2017 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_ENCODER_FACTORY_H_ +#define API_AUDIO_CODECS_AUDIO_ENCODER_FACTORY_H_ + +#include <memory> +#include <vector> + +#include "absl/types/optional.h" +#include "api/audio_codecs/audio_codec_pair_id.h" +#include "api/audio_codecs/audio_encoder.h" +#include "api/audio_codecs/audio_format.h" +#include "rtc_base/ref_count.h" + +namespace webrtc { + +// A factory that creates AudioEncoders. +class AudioEncoderFactory : public rtc::RefCountInterface { + public: + // Returns a prioritized list of audio codecs, to use for signaling etc. + virtual std::vector<AudioCodecSpec> GetSupportedEncoders() = 0; + + // Returns information about how this format would be encoded, provided it's + // supported. More format and format variations may be supported than those + // returned by GetSupportedEncoders(). + virtual absl::optional<AudioCodecInfo> QueryAudioEncoder( + const SdpAudioFormat& format) = 0; + + // Creates an AudioEncoder for the specified format. The encoder will tags its + // payloads with the specified payload type. The `codec_pair_id` argument is + // used to link encoders and decoders that talk to the same remote entity: if + // a AudioEncoderFactory::MakeAudioEncoder() and a + // AudioDecoderFactory::MakeAudioDecoder() 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 encoders must still + // work. + // + // TODO(ossu): Try to avoid audio encoders having to know their payload type. + virtual std::unique_ptr<AudioEncoder> MakeAudioEncoder( + int payload_type, + const SdpAudioFormat& format, + absl::optional<AudioCodecPairId> codec_pair_id) = 0; +}; + +} // namespace webrtc + +#endif // API_AUDIO_CODECS_AUDIO_ENCODER_FACTORY_H_ |