blob: cdff513263742ad2cecdcc8c20852e757183c87d [file] [log] [blame]
* Copyright (c) 2013 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.
#include <string>
#include <vector>
#include "webrtc/common_types.h"
#include "webrtc/rtc_base/basictypes.h"
#include "webrtc/rtc_base/optional.h"
#include "webrtc/rtc_base/refcount.h"
#include "webrtc/rtc_base/scoped_ref_ptr.h"
#include "webrtc/typedefs.h"
namespace webrtc {
struct VideoStream {
std::string ToString() const;
size_t width;
size_t height;
int max_framerate;
int min_bitrate_bps;
int target_bitrate_bps;
int max_bitrate_bps;
int max_qp;
// Bitrate thresholds for enabling additional temporal layers. Since these are
// thresholds in between layers, we have one additional layer. One threshold
// gives two temporal layers, one below the threshold and one above, two give
// three, and so on.
// The VideoEncoder may redistribute bitrates over the temporal layers so a
// bitrate threshold of 100k and an estimate of 105k does not imply that we
// get 100k in one temporal layer and 5k in the other, just that the bitrate
// in the first temporal layer should not exceed 100k.
// TODO(kthelgason): Apart from a special case for two-layer screencast these
// thresholds are not propagated to the VideoEncoder. To be implemented.
std::vector<int> temporal_layer_thresholds_bps;
class VideoEncoderConfig {
// These are reference counted to permit copying VideoEncoderConfig and be
// kept alive until all encoder_specific_settings go out of scope.
// TODO(kthelgason): Consider removing the need for copying VideoEncoderConfig
// and use rtc::Optional for encoder_specific_settings instead.
class EncoderSpecificSettings : public rtc::RefCountInterface {
// TODO(pbos): Remove FillEncoderSpecificSettings as soon as VideoCodec is
// not in use and encoder implementations ask for codec-specific structs
// directly.
void FillEncoderSpecificSettings(VideoCodec* codec_struct) const;
virtual void FillVideoCodecVp8(VideoCodecVP8* vp8_settings) const;
virtual void FillVideoCodecVp9(VideoCodecVP9* vp9_settings) const;
virtual void FillVideoCodecH264(VideoCodecH264* h264_settings) const;
~EncoderSpecificSettings() override {}
friend class VideoEncoderConfig;
class H264EncoderSpecificSettings : public EncoderSpecificSettings {
explicit H264EncoderSpecificSettings(const VideoCodecH264& specifics);
void FillVideoCodecH264(VideoCodecH264* h264_settings) const override;
VideoCodecH264 specifics_;
class Vp8EncoderSpecificSettings : public EncoderSpecificSettings {
explicit Vp8EncoderSpecificSettings(const VideoCodecVP8& specifics);
void FillVideoCodecVp8(VideoCodecVP8* vp8_settings) const override;
VideoCodecVP8 specifics_;
class Vp9EncoderSpecificSettings : public EncoderSpecificSettings {
explicit Vp9EncoderSpecificSettings(const VideoCodecVP9& specifics);
void FillVideoCodecVp9(VideoCodecVP9* vp9_settings) const override;
VideoCodecVP9 specifics_;
enum class ContentType {
class VideoStreamFactoryInterface : public rtc::RefCountInterface {
// An implementation should return a std::vector<VideoStream> with the
// wanted VideoStream settings for the given video resolution.
// The size of the vector may not be larger than
// |encoder_config.number_of_streams|.
virtual std::vector<VideoStream> CreateEncoderStreams(
int width,
int height,
const VideoEncoderConfig& encoder_config) = 0;
~VideoStreamFactoryInterface() override {}
VideoEncoderConfig& operator=(VideoEncoderConfig&&) = default;
VideoEncoderConfig& operator=(const VideoEncoderConfig&) = delete;
// Mostly used by tests. Avoid creating copies if you can.
VideoEncoderConfig Copy() const { return VideoEncoderConfig(*this); }
std::string ToString() const;
rtc::scoped_refptr<VideoStreamFactoryInterface> video_stream_factory;
std::vector<SpatialLayer> spatial_layers;
ContentType content_type;
rtc::scoped_refptr<const EncoderSpecificSettings> encoder_specific_settings;
// Padding will be used up to this bitrate regardless of the bitrate produced
// by the encoder. Padding above what's actually produced by the encoder helps
// maintaining a higher bitrate estimate. Padding will however not be sent
// unless the estimated bandwidth indicates that the link can handle it.
int min_transmit_bitrate_bps;
int max_bitrate_bps;
// Max number of encoded VideoStreams to produce.
size_t number_of_streams;
// Access to the copy constructor is private to force use of the Copy()
// method for those exceptional cases where we do use it.
VideoEncoderConfig(const VideoEncoderConfig&);
} // namespace webrtc