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/*
* Copyright (c) 2014 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 WEBRTC_VIDEO_ENCODER_H_
#define WEBRTC_VIDEO_ENCODER_H_
#include <string>
#include <vector>
#include "webrtc/common_types.h"
#include "webrtc/typedefs.h"
#include "webrtc/video_frame.h"
namespace webrtc {
class RTPFragmentationHeader;
// TODO(pbos): Expose these through a public (root) header or change these APIs.
struct CodecSpecificInfo;
struct VideoCodec;
class EncodedImageCallback {
public:
virtual ~EncodedImageCallback() {}
// Callback function which is called when an image has been encoded.
virtual int32_t Encoded(const EncodedImage& encoded_image,
const CodecSpecificInfo* codec_specific_info,
const RTPFragmentationHeader* fragmentation) = 0;
};
class VideoEncoder {
public:
enum EncoderType {
kH264,
kVp8,
kVp9,
kUnsupportedCodec,
};
static VideoEncoder* Create(EncoderType codec_type);
static VideoCodecVP8 GetDefaultVp8Settings();
static VideoCodecVP9 GetDefaultVp9Settings();
static VideoCodecH264 GetDefaultH264Settings();
virtual ~VideoEncoder() {}
// Initialize the encoder with the information from the codecSettings
//
// Input:
// - codec_settings : Codec settings
// - number_of_cores : Number of cores available for the encoder
// - max_payload_size : The maximum size each payload is allowed
// to have. Usually MTU - overhead.
//
// Return value : Set bit rate if OK
// <0 - Errors:
// WEBRTC_VIDEO_CODEC_ERR_PARAMETER
// WEBRTC_VIDEO_CODEC_ERR_SIZE
// WEBRTC_VIDEO_CODEC_LEVEL_EXCEEDED
// WEBRTC_VIDEO_CODEC_MEMORY
// WEBRTC_VIDEO_CODEC_ERROR
virtual int32_t InitEncode(const VideoCodec* codec_settings,
int32_t number_of_cores,
size_t max_payload_size) = 0;
// Register an encode complete callback object.
//
// Input:
// - callback : Callback object which handles encoded images.
//
// Return value : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
virtual int32_t RegisterEncodeCompleteCallback(
EncodedImageCallback* callback) = 0;
// Free encoder memory.
// Return value : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
virtual int32_t Release() = 0;
// Encode an I420 image (as a part of a video stream). The encoded image
// will be returned to the user through the encode complete callback.
//
// Input:
// - frame : Image to be encoded
// - frame_types : Frame type to be generated by the encoder.
//
// Return value : WEBRTC_VIDEO_CODEC_OK if OK
// <0 - Errors:
// WEBRTC_VIDEO_CODEC_ERR_PARAMETER
// WEBRTC_VIDEO_CODEC_MEMORY
// WEBRTC_VIDEO_CODEC_ERROR
// WEBRTC_VIDEO_CODEC_TIMEOUT
virtual int32_t Encode(const VideoFrame& frame,
const CodecSpecificInfo* codec_specific_info,
const std::vector<FrameType>* frame_types) = 0;
// Inform the encoder of the new packet loss rate and the round-trip time of
// the network.
//
// Input:
// - packet_loss : Fraction lost
// (loss rate in percent = 100 * packetLoss / 255)
// - rtt : Round-trip time in milliseconds
// Return value : WEBRTC_VIDEO_CODEC_OK if OK
// <0 - Errors: WEBRTC_VIDEO_CODEC_ERROR
virtual int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) = 0;
// Inform the encoder about the new target bit rate.
//
// Input:
// - bitrate : New target bit rate
// - framerate : The target frame rate
//
// Return value : WEBRTC_VIDEO_CODEC_OK if OK, < 0 otherwise.
virtual int32_t SetRates(uint32_t bitrate, uint32_t framerate) = 0;
virtual int32_t SetPeriodicKeyFrames(bool enable) { return -1; }
virtual void OnDroppedFrame() {}
virtual int GetTargetFramerate() { return -1; }
virtual bool SupportsNativeHandle() const { return false; }
virtual const char* ImplementationName() const { return "unknown"; }
};
// Class used to wrap external VideoEncoders to provide a fallback option on
// software encoding when a hardware encoder fails to encode a stream due to
// hardware restrictions, such as max resolution.
class VideoEncoderSoftwareFallbackWrapper : public VideoEncoder {
public:
VideoEncoderSoftwareFallbackWrapper(VideoCodecType codec_type,
webrtc::VideoEncoder* encoder);
int32_t InitEncode(const VideoCodec* codec_settings,
int32_t number_of_cores,
size_t max_payload_size) override;
int32_t RegisterEncodeCompleteCallback(
EncodedImageCallback* callback) override;
int32_t Release() override;
int32_t Encode(const VideoFrame& frame,
const CodecSpecificInfo* codec_specific_info,
const std::vector<FrameType>* frame_types) override;
int32_t SetChannelParameters(uint32_t packet_loss, int64_t rtt) override;
int32_t SetRates(uint32_t bitrate, uint32_t framerate) override;
void OnDroppedFrame() override;
int GetTargetFramerate() override;
bool SupportsNativeHandle() const override;
const char* ImplementationName() const override;
private:
bool InitFallbackEncoder();
// Settings used in the last InitEncode call and used if a dynamic fallback to
// software is required.
VideoCodec codec_settings_;
int32_t number_of_cores_;
size_t max_payload_size_;
// The last bitrate/framerate set, and a flag for noting they are set.
bool rates_set_;
uint32_t bitrate_;
uint32_t framerate_;
// The last channel parameters set, and a flag for noting they are set.
bool channel_parameters_set_;
uint32_t packet_loss_;
int64_t rtt_;
const EncoderType encoder_type_;
webrtc::VideoEncoder* const encoder_;
rtc::scoped_ptr<webrtc::VideoEncoder> fallback_encoder_;
std::string fallback_implementation_name_;
EncodedImageCallback* callback_;
};
} // namespace webrtc
#endif // WEBRTC_VIDEO_ENCODER_H_
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