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, 135 insertions, 0 deletions

diff --git a/third_party/libwebrtc/api/video_codecs/video_encoder_factory_template.h b/third_party/libwebrtc/api/video_codecs/video_encoder_factory_template.h
new file mode 100644
index 0000000000..643096dbbb
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+++ b/third_party/libwebrtc/api/video_codecs/video_encoder_factory_template.h
@@ -0,0 +1,135 @@
+/*
+ *  Copyright (c) 2022 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_TEMPLATE_H_
+#define API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_TEMPLATE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/algorithm/container.h"
+#include "api/array_view.h"
+#include "api/video_codecs/video_encoder.h"
+#include "api/video_codecs/video_encoder_factory.h"
+#include "modules/video_coding/svc/scalability_mode_util.h"
+
+namespace webrtc {
+// The VideoEncoderFactoryTemplate supports encoders implementations given as
+// template arguments.
+//
+// To include an encoder in the factory it requires three static members
+// functions to be defined:
+//
+//   // Returns the supported SdpVideoFormats this encoder can produce.
+//   static std::vector<SdpVideoFormat> SupportedFormats();
+//
+//   // Creates an encoder instance for the given format.
+//   static std::unique_ptr<VideoEncoder>
+//       CreateEncoder(const SdpVideoFormat& format);
+//
+//   // Returns true if the encoder supports the given scalability mode.
+//   static bool
+//       IsScalabilityModeSupported(ScalabilityMode scalability_mode);
+//
+// Note that the order of the template arguments matter as the factory will
+// query/return the first encoder implementation supporting the given
+// SdpVideoFormat.
+template <typename... Ts>
+class VideoEncoderFactoryTemplate : public VideoEncoderFactory {
+ public:
+  std::vector<SdpVideoFormat> GetSupportedFormats() const override {
+    return GetSupportedFormatsInternal<Ts...>();
+  }
+
+  std::unique_ptr<VideoEncoder> CreateVideoEncoder(
+      const SdpVideoFormat& format) override {
+    return CreateVideoEncoderInternal<Ts...>(format);
+  }
+
+  CodecSupport QueryCodecSupport(
+      const SdpVideoFormat& format,
+      absl::optional<std::string> scalability_mode) const override {
+    return QueryCodecSupportInternal<Ts...>(format, scalability_mode);
+  }
+
+ private:
+  bool IsFormatInList(
+      const SdpVideoFormat& format,
+      rtc::ArrayView<const SdpVideoFormat> supported_formats) const {
+    return absl::c_any_of(
+        supported_formats, [&](const SdpVideoFormat& supported_format) {
+          return supported_format.name == format.name &&
+                 supported_format.parameters == format.parameters;
+        });
+  }
+
+  template <typename V>
+  bool IsScalabilityModeSupported(
+      const absl::optional<std::string>& scalability_mode_string) const {
+    if (!scalability_mode_string.has_value()) {
+      return true;
+    }
+    absl::optional<ScalabilityMode> scalability_mode =
+        ScalabilityModeFromString(*scalability_mode_string);
+    return scalability_mode.has_value() &&
+           V::IsScalabilityModeSupported(*scalability_mode);
+  }
+
+  template <typename V, typename... Vs>
+  std::vector<SdpVideoFormat> GetSupportedFormatsInternal() const {
+    auto supported_formats = V::SupportedFormats();
+
+    if constexpr (sizeof...(Vs) > 0) {
+      // Supported formats may overlap between implementations, so duplicates
+      // should be filtered out.
+      for (const auto& other_format : GetSupportedFormatsInternal<Vs...>()) {
+        if (!IsFormatInList(other_format, supported_formats)) {
+          supported_formats.push_back(other_format);
+        }
+      }
+    }
+
+    return supported_formats;
+  }
+
+  template <typename V, typename... Vs>
+  std::unique_ptr<VideoEncoder> CreateVideoEncoderInternal(
+      const SdpVideoFormat& format) {
+    if (IsFormatInList(format, V::SupportedFormats())) {
+      return V::CreateEncoder(format);
+    }
+
+    if constexpr (sizeof...(Vs) > 0) {
+      return CreateVideoEncoderInternal<Vs...>(format);
+    }
+
+    return nullptr;
+  }
+
+  template <typename V, typename... Vs>
+  CodecSupport QueryCodecSupportInternal(
+      const SdpVideoFormat& format,
+      const absl::optional<std::string>& scalability_mode) const {
+    if (IsFormatInList(format, V::SupportedFormats())) {
+      return {.is_supported = IsScalabilityModeSupported<V>(scalability_mode)};
+    }
+
+    if constexpr (sizeof...(Vs) > 0) {
+      return QueryCodecSupportInternal<Vs...>(format, scalability_mode);
+    }
+
+    return {.is_supported = false};
+  }
+};
+
+}  // namespace webrtc
+
+#endif  // API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_TEMPLATE_H_