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/*
* Copyright (c) 2024 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_INTERFACE_H_
#define API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_INTERFACE_H_
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <variant>
#include <vector>
#include "api/units/time_delta.h"
#include "api/video/resolution.h"
#include "api/video/video_frame_buffer.h"
#include "api/video_codecs/video_encoder_interface.h"
#include "api/video_codecs/video_encoding_general.h"
#include "rtc_base/numerics/rational.h"
namespace webrtc {
using FrameType = VideoEncoderInterface::FrameType;
// NOTE: This class is still under development and may change without notice.
class VideoEncoderFactoryInterface {
public:
enum class RateControlMode { kCqp, kCbr };
struct Capabilities {
struct PredictionConstraints {
enum class BufferSpaceType {
kMultiInstance, // multiple independent sets of buffers
kMultiKeyframe, // single set of buffers, but can store multiple
// keyframes simultaneously.
kSingleKeyframe // single set of buffers, can only store one keyframe
// at a time.
};
int num_buffers;
int max_references;
int max_temporal_layers;
BufferSpaceType buffer_space_type;
int max_spatial_layers;
std::vector<Rational> scaling_factors;
std::vector<FrameType> supported_frame_types;
} prediction_constraints;
struct InputConstraints {
Resolution min;
Resolution max;
int pixel_alignment;
std::vector<VideoFrameBuffer::Type> input_formats;
} input_constraints;
std::vector<EncodingFormat> encoding_formats;
struct BitrateControl {
std::pair<int, int> qp_range;
std::vector<RateControlMode> rc_modes;
} rate_control;
struct Performance {
bool encode_on_calling_thread;
std::pair<int, int> min_max_effort_level;
} performance;
};
struct StaticEncoderSettings {
struct Cqp {};
struct Cbr {
// TD: Should there be an intial buffer size?
TimeDelta max_buffer_size;
TimeDelta target_buffer_size;
};
Resolution max_encode_dimensions;
EncodingFormat encoding_format;
std::variant<Cqp, Cbr> rc_mode;
int max_number_of_threads;
};
virtual ~VideoEncoderFactoryInterface() = default;
virtual std::string CodecName() const = 0;
virtual std::string ImplementationName() const = 0;
virtual std::map<std::string, std::string> CodecSpecifics() const = 0;
virtual Capabilities GetEncoderCapabilities() const = 0;
virtual std::unique_ptr<VideoEncoderInterface> CreateEncoder(
const StaticEncoderSettings& settings,
const std::map<std::string, std::string>& encoder_specific_settings) = 0;
};
} // namespace webrtc
#endif // API_VIDEO_CODECS_VIDEO_ENCODER_FACTORY_INTERFACE_H_
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