mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-10-06 12:13:49 +08:00
136 lines
3.9 KiB
C++
136 lines
3.9 KiB
C++
/*
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* Copyright (c) 2016-present The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
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*
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* Use of this source code is governed by MIT-like license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef ZLMEDIAKIT_H264_H
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#define ZLMEDIAKIT_H264_H
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#include "Extension/Frame.h"
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#include "Extension/Track.h"
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#define H264_TYPE(v) ((uint8_t)(v) & 0x1F)
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namespace mediakit{
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void splitH264(const char *ptr, size_t len, size_t prefix, const std::function<void(const char *, size_t, size_t)> &cb);
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size_t prefixSize(const char *ptr, size_t len);
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template<typename Parent>
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class H264FrameHelper : public Parent{
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public:
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friend class FrameImp;
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friend class toolkit::ResourcePool_l<H264FrameHelper>;
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using Ptr = std::shared_ptr<H264FrameHelper>;
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enum {
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NAL_IDR = 5,
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NAL_SEI = 6,
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NAL_SPS = 7,
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NAL_PPS = 8,
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NAL_AUD = 9,
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NAL_B_P = 1,
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};
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template<typename ...ARGS>
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H264FrameHelper(ARGS &&...args): Parent(std::forward<ARGS>(args)...) {
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this->_codec_id = CodecH264;
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}
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bool keyFrame() const override {
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auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
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return H264_TYPE(*nal_ptr) == NAL_IDR && decodeAble();
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}
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bool configFrame() const override {
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auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
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switch (H264_TYPE(*nal_ptr)) {
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case NAL_SPS:
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case NAL_PPS: return true;
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default: return false;
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}
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}
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bool dropAble() const override {
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auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
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switch (H264_TYPE(*nal_ptr)) {
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case NAL_SEI:
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case NAL_AUD: return true;
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default: return false;
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}
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}
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bool decodeAble() const override {
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auto nal_ptr = (uint8_t *) this->data() + this->prefixSize();
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auto type = H264_TYPE(*nal_ptr);
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//多slice情况下, first_mb_in_slice 表示其为一帧的开始
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return type >= NAL_B_P && type <= NAL_IDR && (nal_ptr[1] & 0x80);
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}
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};
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/**
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* 264帧类
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*/
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using H264Frame = H264FrameHelper<FrameImp>;
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/**
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* 防止内存拷贝的H264类
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* 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
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*/
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using H264FrameNoCacheAble = H264FrameHelper<FrameFromPtr>;
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/**
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* 264视频通道
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*/
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class H264Track : public VideoTrack {
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public:
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using Ptr = std::shared_ptr<H264Track>;
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/**
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* 不指定sps pps构造h264类型的媒体
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* 在随后的inputFrame中获取sps pps
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*/
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H264Track() = default;
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/**
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* 构造h264类型的媒体
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* @param sps sps帧数据
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* @param pps pps帧数据
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* @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
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* @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
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*/
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H264Track(const std::string &sps, const std::string &pps, int sps_prefix_len = 4, int pps_prefix_len = 4);
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bool ready() const override;
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CodecId getCodecId() const override;
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int getVideoHeight() const override;
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int getVideoWidth() const override;
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float getVideoFps() const override;
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bool inputFrame(const Frame::Ptr &frame) override;
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toolkit::Buffer::Ptr getExtraData() const override;
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void setExtraData(const uint8_t *data, size_t size) override;
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bool update() override;
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private:
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Sdp::Ptr getSdp(uint8_t payload_type) const override;
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Track::Ptr clone() const override;
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bool inputFrame_l(const Frame::Ptr &frame);
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void insertConfigFrame(const Frame::Ptr &frame);
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private:
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bool _latest_is_config_frame = false;
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int _width = 0;
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int _height = 0;
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float _fps = 0;
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std::string _sps;
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std::string _pps;
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};
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}//namespace mediakit
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#endif //ZLMEDIAKIT_H264_H
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