mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-23 11:17:09 +08:00
136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/*
|
||
* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
|
||
*
|
||
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
|
||
*
|
||
* Use of this source code is governed by MIT-like license that can be found in the
|
||
* LICENSE file in the root of the source tree. All contributing project authors
|
||
* may be found in the AUTHORS file in the root of the source tree.
|
||
*/
|
||
|
||
#ifndef ZLMEDIAKIT_H264_H
|
||
#define ZLMEDIAKIT_H264_H
|
||
|
||
#include "Extension/Frame.h"
|
||
#include "Extension/Track.h"
|
||
|
||
#define H264_TYPE(v) ((uint8_t)(v) & 0x1F)
|
||
|
||
namespace mediakit{
|
||
|
||
void splitH264(const char *ptr, size_t len, size_t prefix, const std::function<void(const char *, size_t, size_t)> &cb);
|
||
size_t prefixSize(const char *ptr, size_t len);
|
||
|
||
template<typename Parent>
|
||
class H264FrameHelper : public Parent{
|
||
public:
|
||
friend class FrameImp;
|
||
friend class toolkit::ResourcePool_l<H264FrameHelper>;
|
||
using Ptr = std::shared_ptr<H264FrameHelper>;
|
||
|
||
enum {
|
||
NAL_IDR = 5,
|
||
NAL_SEI = 6,
|
||
NAL_SPS = 7,
|
||
NAL_PPS = 8,
|
||
NAL_AUD = 9,
|
||
NAL_B_P = 1,
|
||
};
|
||
|
||
template<typename ...ARGS>
|
||
H264FrameHelper(ARGS &&...args): Parent(std::forward<ARGS>(args)...) {
|
||
this->_codec_id = CodecH264;
|
||
}
|
||
|
||
bool keyFrame() const override {
|
||
auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
|
||
return H264_TYPE(*nal_ptr) == NAL_IDR && decodeAble();
|
||
}
|
||
|
||
bool configFrame() const override {
|
||
auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
|
||
switch (H264_TYPE(*nal_ptr)) {
|
||
case NAL_SPS:
|
||
case NAL_PPS: return true;
|
||
default: return false;
|
||
}
|
||
}
|
||
|
||
bool dropAble() const override {
|
||
auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
|
||
switch (H264_TYPE(*nal_ptr)) {
|
||
case NAL_SEI:
|
||
case NAL_AUD: return true;
|
||
default: return false;
|
||
}
|
||
}
|
||
|
||
bool decodeAble() const override {
|
||
auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
|
||
auto type = H264_TYPE(*nal_ptr);
|
||
//多slice情况下, first_mb_in_slice 表示其为一帧的开始
|
||
return type >= NAL_B_P && type <= NAL_IDR && (nal_ptr[1] & 0x80);
|
||
}
|
||
};
|
||
|
||
/**
|
||
* 264帧类
|
||
*/
|
||
using H264Frame = H264FrameHelper<FrameImp>;
|
||
|
||
/**
|
||
* 防止内存拷贝的H264类
|
||
* 用户可以通过该类型快速把一个指针无拷贝的包装成Frame类
|
||
*/
|
||
using H264FrameNoCacheAble = H264FrameHelper<FrameFromPtr>;
|
||
|
||
/**
|
||
* 264视频通道
|
||
*/
|
||
class H264Track : public VideoTrack {
|
||
public:
|
||
using Ptr = std::shared_ptr<H264Track>;
|
||
|
||
/**
|
||
* 不指定sps pps构造h264类型的媒体
|
||
* 在随后的inputFrame中获取sps pps
|
||
*/
|
||
H264Track() = default;
|
||
|
||
/**
|
||
* 构造h264类型的媒体
|
||
* @param sps sps帧数据
|
||
* @param pps pps帧数据
|
||
* @param sps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
|
||
* @param pps_prefix_len 264头长度，可以为3个或4个字节，一般为0x00 00 00 01
|
||
*/
|
||
H264Track(const std::string &sps, const std::string &pps, int sps_prefix_len = 4, int pps_prefix_len = 4);
|
||
|
||
bool ready() const override;
|
||
CodecId getCodecId() const override;
|
||
int getVideoHeight() const override;
|
||
int getVideoWidth() const override;
|
||
float getVideoFps() const override;
|
||
bool inputFrame(const Frame::Ptr &frame) override;
|
||
toolkit::Buffer::Ptr getExtraData() const override;
|
||
void setExtraData(const uint8_t *data, size_t size) override;
|
||
bool update() override;
|
||
|
||
private:
|
||
Sdp::Ptr getSdp(uint8_t payload_type) const override;
|
||
Track::Ptr clone() const override;
|
||
bool inputFrame_l(const Frame::Ptr &frame);
|
||
void insertConfigFrame(const Frame::Ptr &frame);
|
||
|
||
private:
|
||
bool _latest_is_config_frame = false;
|
||
int _width = 0;
|
||
int _height = 0;
|
||
float _fps = 0;
|
||
std::string _sps;
|
||
std::string _pps;
|
||
};
|
||
|
||
}//namespace mediakit
|
||
#endif //ZLMEDIAKIT_H264_H
|