原文地址: https://www.cnblogs.com/ziyu-trip/p/7075003.html
#ifndef _X264_ENCODER_H
#define _X264_ENCODER_H
#include <stdint.h>
#include "x264.h"
#include "opencv/cv.h"
#include "opencv/highgui.h"
struct x264_encoder{
x264_param_t param;
char preset[20];
char tune[20];
char profile[20];
x264_t* h;
x264_picture_t pic_in;
x264_picture_t pic_out;
long colorspace;
x264_nal_t* nal;
int iframe;
int iframe_size;
int inal;
};
class x264Encoder
{
public:
x264Encoder();
x264Encoder(int videoWidth, int videoHeight, int channel, int fps);
~x264Encoder();
/** 创建X264编码器
* @param[in] videoWidth 视频宽度
* @param[in] videoHeight 视频高度
* @param[in] fps 帧率
* @return 成功返回true, 失败返回false.
*/
bool Create(int videoWidth, int videoHeight, int channel = 3, int fps = 30);
/** 编码一帧
* @param[in] frame 输入的一帧图像
* @return 返回编码后数据尺寸, 0表示编码失败
*/
int EncodeOneFrame(const cv::Mat& frame);
/** 获取编码后的帧数据
* 说明: EncodeOneFrame 后调用
* @return 返回裸x264数据
*/
uchar* GetEncodedFrame() const;
/** 销毁X264编码器
*/
void Destory();
// 编码器是否可用
bool IsValid() const;
private:
void Init();
public:
int m_width;
int m_height;
int m_channel;
int m_fps;
protected:
int m_widthstep;
int m_lumaSize;
int m_chromaSize;
x264_encoder* m_encoder;
};
#endif
#include "x264_encoder.h"
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include "opencv2/imgproc.hpp"
#define ENCODER_TUNE "zerolatency"
#define ENCODER_PROFILE "baseline"
#define ENCODER_PRESET "veryfast"
#define ENCODER_COLORSPACE X264_CSP_I420
#define CLEAR(x) (memset((&x),0,sizeof(x)))
x264Encoder::x264Encoder()
{
Init();
}
x264Encoder::x264Encoder(int videoWidth, int videoHeight, int channel, int fps)
{
Init();
Create(videoWidth, videoHeight, channel, fps);
}
x264Encoder::~x264Encoder()
{
Destory();
}
void x264Encoder::Init()
{
m_width = 0;
m_height = 0;
m_channel = 0;
m_widthstep = 0;
m_fps = 30;
m_lumaSize = 0;
m_chromaSize = 0;
m_encoder = NULL;
}
bool x264Encoder::Create(int videoWidth, int videoHeight, int channel, int fps)
{
int ret;
int imgSize;
if (videoWidth <= 0 || videoHeight <= 0 || channel < 0 || fps <= 0){
printf("wrong input param\n");
return false;
}
m_width = videoWidth;
m_height = videoHeight;
m_channel = channel;
m_fps = fps;
m_widthstep = videoWidth * channel;
m_lumaSize = m_width * m_height;
m_chromaSize = m_lumaSize / 4;
imgSize = m_lumaSize * channel;
m_encoder = (x264_encoder *)malloc(sizeof(x264_encoder));
if (!m_encoder){
printf("cannot malloc x264_encoder !\n");
return false;
}
CLEAR(*m_encoder);
m_encoder->iframe = 0;
m_encoder->iframe_size = 0;
strcpy(m_encoder->preset, ENCODER_PRESET);
strcpy(m_encoder->tune, ENCODER_TUNE);
/*初始化编码器*/
CLEAR(m_encoder->param);
x264_param_default(&m_encoder->param);
ret = x264_param_default_preset(&m_encoder->param, m_encoder->preset, m_encoder->tune);
if (ret < 0){
printf("x264_param_default_preset error!\n");
return false;
}
/*cpuFlags 去空缓冲区继续使用不死锁保证*/
m_encoder->param.i_threads = X264_SYNC_LOOKAHEAD_AUTO;
/*视频选项*/
m_encoder->param.i_csp = X264_CSP_I420;
m_encoder->param.i_width = m_width; // 要编码的图像的宽度
m_encoder->param.i_height = m_height; // 要编码的图像的高度
m_encoder->param.i_frame_total = 0; // 要编码的总帧数，不知道用0
m_encoder->param.i_keyint_max = 10*fps;// 关键帧间隔
/*流参数*/
m_encoder->param.i_bframe = 5;
m_encoder->param.b_open_gop = 0;
m_encoder->param.i_bframe_pyramid = 0;
m_encoder->param.i_bframe_adaptive = X264_B_ADAPT_TRELLIS;
/*log参数，不需要打印编码信息时直接注释掉*/
m_encoder->param.i_log_level = X264_LOG_NONE;
m_encoder->param.i_fps_num = fps;//码率分子
m_encoder->param.i_fps_den = 1; //码率分母
m_encoder->param.b_intra_refresh = 1;
m_encoder->param.b_annexb = 1;
m_encoder->param.rc.f_rf_constant = 24;
m_encoder->param.rc.i_rc_method = X264_RC_CRF;
/////////////////////////////////////////////////////////////////////////////////////////////////////
strcpy(m_encoder->profile, ENCODER_PROFILE);
ret = x264_param_apply_profile(&m_encoder->param, m_encoder->profile);
if (ret < 0){
printf("x264_param_apply_profile error!\n");
return false;
}
/*打开编码器*/
m_encoder->h = x264_encoder_open(&m_encoder->param);
m_encoder->colorspace = ENCODER_COLORSPACE;
/*初始化pic*/
ret = x264_picture_alloc(&m_encoder->pic_in, m_encoder->colorspace, m_width, m_height);
if ( ret < 0 ){
printf("x264_picture_alloc error! ret=%d\n", ret);
return false;
}
m_encoder->pic_in.img.i_csp = m_encoder->colorspace;
m_encoder->pic_in.img.i_plane = 3;
m_encoder->pic_in.i_type = X264_TYPE_AUTO;
m_encoder->inal = 0;
m_encoder->nal = (x264_nal_t *)calloc(2, sizeof(x264_nal_t));
if (!m_encoder->nal){
printf("malloc x264_nal_t error!\n");
return false;
}
CLEAR(*(m_encoder->nal));
return true;
}
int x264Encoder::EncodeOneFrame(const cv::Mat& frame)
{
if (frame.empty()){
return 0;
}
cv::Mat bgr(frame), yuv;
if(1 == frame.channels()){
cv::cvtColor(frame, bgr, CV_GRAY2BGR);
}
cv::cvtColor(bgr, yuv, CV_BGR2YUV_I420);
memcpy(m_encoder->pic_in.img.plane[0], yuv.data, m_lumaSize);
memcpy(m_encoder->pic_in.img.plane[1], yuv.data + m_lumaSize, m_chromaSize);
memcpy(m_encoder->pic_in.img.plane[2], yuv.data + m_lumaSize + m_chromaSize, m_chromaSize);
m_encoder->pic_in.i_pts = m_encoder->iframe ++;
m_encoder->iframe_size = x264_encoder_encode(m_encoder->h, &m_encoder->nal, &m_encoder->inal, &m_encoder->pic_in, &m_encoder->pic_out);
return m_encoder->iframe_size;
}
uchar* x264Encoder::GetEncodedFrame() const
{
return m_encoder->nal->p_payload;
}
void x264Encoder::Destory()
{
if (m_encoder){
if (m_encoder->h){
x264_encoder_close(m_encoder->h);
m_encoder->h = NULL;
}
free(m_encoder);
m_encoder = NULL;
}
}
bool x264Encoder::IsValid() const
{
return ((m_encoder != NULL) && (m_encoder->h != NULL));
}
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