Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 127 insertions, 0 deletions

diff --git a/third_party/libwebrtc/api/video_codecs/video_encoder_factory.h b/third_party/libwebrtc/api/video_codecs/video_encoder_factory.h
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index 0000000000..d28a2a4035
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+++ b/third_party/libwebrtc/api/video_codecs/video_encoder_factory.h
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+/*
+ *  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_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_H_
+#define API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/units/data_rate.h"
+#include "api/video/render_resolution.h"
+#include "api/video_codecs/sdp_video_format.h"
+
+namespace webrtc {
+
+class VideoEncoder;
+
+// A factory that creates VideoEncoders.
+// NOTE: This class is still under development and may change without notice.
+class VideoEncoderFactory {
+ public:
+  struct CodecSupport {
+    bool is_supported = false;
+    bool is_power_efficient = false;
+  };
+
+  // An injectable class that is continuously updated with encoding conditions
+  // and selects the best encoder given those conditions. An implementation is
+  // typically stateful to avoid toggling between different encoders, which is
+  // costly due to recreation of objects, a new codec will always start with a
+  // key-frame.
+  class EncoderSelectorInterface {
+   public:
+    virtual ~EncoderSelectorInterface() {}
+
+    // Informs the encoder selector about which encoder that is currently being
+    // used.
+    virtual void OnCurrentEncoder(const SdpVideoFormat& format) = 0;
+
+    // Called every time the available bitrate is updated. Should return a
+    // non-empty if an encoder switch should be performed.
+    virtual absl::optional<SdpVideoFormat> OnAvailableBitrate(
+        const DataRate& rate) = 0;
+
+    // Called every time the encoder input resolution change. Should return a
+    // non-empty if an encoder switch should be performed.
+    virtual absl::optional<SdpVideoFormat> OnResolutionChange(
+        const RenderResolution& resolution) {
+      return absl::nullopt;
+    }
+
+    // Called if the currently used encoder reports itself as broken. Should
+    // return a non-empty if an encoder switch should be performed.
+    virtual absl::optional<SdpVideoFormat> OnEncoderBroken() = 0;
+  };
+
+  // Returns a list of supported video formats in order of preference, to use
+  // for signaling etc.
+  virtual std::vector<SdpVideoFormat> GetSupportedFormats() const = 0;
+
+  // Returns a list of supported video formats in order of preference, that can
+  // also be tagged with additional information to allow the VideoEncoderFactory
+  // to separate between different implementations when CreateVideoEncoder is
+  // called.
+  virtual std::vector<SdpVideoFormat> GetImplementations() const {
+    return GetSupportedFormats();
+  }
+
+  // Query whether the specifed format is supported or not and if it will be
+  // power efficient, which is currently interpreted as if there is support for
+  // hardware acceleration.
+  // See https://w3c.github.io/webrtc-svc/#scalabilitymodes* for a specification
+  // of valid values for `scalability_mode`.
+  // NOTE: QueryCodecSupport is currently an experimental feature that is
+  // subject to change without notice.
+  virtual CodecSupport QueryCodecSupport(
+      const SdpVideoFormat& format,
+      absl::optional<std::string> scalability_mode) const {
+    // Default implementation, query for supported formats and check if the
+    // specified format is supported. Returns false if scalability_mode is
+    // specified.
+    CodecSupport codec_support;
+    if (!scalability_mode) {
+      codec_support.is_supported = format.IsCodecInList(GetSupportedFormats());
+    }
+    return codec_support;
+  }
+
+  // Creates a VideoEncoder for the specified format.
+  virtual std::unique_ptr<VideoEncoder> CreateVideoEncoder(
+      const SdpVideoFormat& format) = 0;
+
+  // This method creates a EncoderSelector to use for a VideoSendStream.
+  // (and hence should probably been called CreateEncoderSelector()).
+  //
+  // Note: This method is unsuitable if encoding several streams that
+  // are using same VideoEncoderFactory (either by several streams in one
+  // PeerConnection or streams with different PeerConnection but same
+  // PeerConnectionFactory). This is due to the fact that the method is not
+  // given any stream identifier, nor is the EncoderSelectorInterface given any
+  // stream identifiers, i.e one does not know which stream is being encoded
+  // with help of the selector.
+  //
+  // In such scenario, the `RtpSenderInterface::SetEncoderSelector` is
+  // recommended.
+  //
+  // TODO(bugs.webrtc.org:14122): Deprecate and remove in favor of
+  // `RtpSenderInterface::SetEncoderSelector`.
+  virtual std::unique_ptr<EncoderSelectorInterface> GetEncoderSelector() const {
+    return nullptr;
+  }
+
+  virtual ~VideoEncoderFactory() {}
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_H_