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02bfcf5132
Since https://webrtc-review.googlesource.com/c/src/+/267780 supported scalability modes are also used to compare for equality between SdpVideoFormats(?). Bug: webrtc:14267, webrtc:13573 Change-Id: I2f3c2fca93bac6fadd222f776f672c9bd3f1de0a Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/268304 Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37510}
134 lines
4.4 KiB
C++
134 lines
4.4 KiB
C++
/*
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* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_TEMPLATE_H_
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#define API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_TEMPLATE_H_
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#include <memory>
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#include <string>
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#include <vector>
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#include "absl/algorithm/container.h"
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#include "api/array_view.h"
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#include "api/video_codecs/video_encoder.h"
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#include "api/video_codecs/video_encoder_factory.h"
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#include "modules/video_coding/svc/scalability_mode_util.h"
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namespace webrtc {
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// The VideoEncoderFactoryTemplate supports encoders implementations given as
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// template arguments.
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//
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// To include an encoder in the factory it requires three static members
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// functions to be defined:
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//
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// // Returns the supported SdpVideoFormats this encoder can produce.
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// static std::vector<SdpVideoFormat> SupportedFormats();
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//
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// // Creates an encoder instance for the given format.
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// static std::unique_ptr<VideoEncoder>
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// CreateEncoder(const SdpVideoFormat& format);
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//
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// // Returns true if the encoder supports the given scalability mode.
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// static bool
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// IsScalabilityModeSupported(ScalabilityMode scalability_mode);
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//
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// Note that the order of the template arguments matter as the factory will
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// query/return the first encoder implementation supporting the given
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// SdpVideoFormat.
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template <typename... Ts>
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class VideoEncoderFactoryTemplate : public VideoEncoderFactory {
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public:
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std::vector<SdpVideoFormat> GetSupportedFormats() const override {
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std::vector<SdpVideoFormat> formats;
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GetSupportedFormatsInternal<Ts...>(formats);
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return formats;
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}
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std::unique_ptr<VideoEncoder> CreateVideoEncoder(
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const SdpVideoFormat& format) override {
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return CreateVideoEncoderInternal<Ts...>(format);
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}
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CodecSupport QueryCodecSupport(
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const SdpVideoFormat& format,
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absl::optional<std::string> scalability_mode) const override {
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return QueryCodecSupportInternal<Ts...>(format, scalability_mode);
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}
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private:
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bool IsFormatInList(
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const SdpVideoFormat& format,
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rtc::ArrayView<const SdpVideoFormat> supported_formats) const {
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return absl::c_any_of(
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supported_formats, [&](const SdpVideoFormat& supported_format) {
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return supported_format.name == format.name &&
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supported_format.parameters == format.parameters;
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});
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}
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template <typename V>
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bool IsScalabilityModeSupported(
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const absl::optional<std::string>& scalability_mode_string) const {
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if (!scalability_mode_string.has_value()) {
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return true;
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}
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absl::optional<ScalabilityMode> scalability_mode =
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ScalabilityModeFromString(*scalability_mode_string);
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return scalability_mode.has_value() &&
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V::IsScalabilityModeSupported(*scalability_mode);
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}
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template <typename V, typename... Vs>
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void GetSupportedFormatsInternal(std::vector<SdpVideoFormat>& formats) const {
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auto supported_formats = V::SupportedFormats();
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for (const auto& format : supported_formats) {
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if (!IsFormatInList(format, formats)) {
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formats.push_back(format);
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}
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}
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if constexpr (sizeof...(Vs) > 0) {
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return GetSupportedFormatsInternal<Vs...>(formats);
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}
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}
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template <typename V, typename... Vs>
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std::unique_ptr<VideoEncoder> CreateVideoEncoderInternal(
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const SdpVideoFormat& format) {
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if (IsFormatInList(format, V::SupportedFormats())) {
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return V::CreateEncoder(format);
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}
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if constexpr (sizeof...(Vs) > 0) {
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return CreateVideoEncoderInternal<Vs...>(format);
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}
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return nullptr;
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}
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template <typename V, typename... Vs>
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CodecSupport QueryCodecSupportInternal(
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const SdpVideoFormat& format,
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const absl::optional<std::string>& scalability_mode) const {
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if (IsFormatInList(format, V::SupportedFormats())) {
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return {.is_supported = IsScalabilityModeSupported<V>(scalability_mode)};
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}
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if constexpr (sizeof...(Vs) > 0) {
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return QueryCodecSupportInternal<Vs...>(format, scalability_mode);
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}
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return {.is_supported = false};
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}
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};
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} // namespace webrtc
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#endif // API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_TEMPLATE_H_
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