本文详细解读了海思SDK中的sample_venc.c代码片段，涉及1080pH.264编码功能，包括多路码流支持、系统初始化、异常处理和编码流程。重点介绍了如何配置参数、处理异常情况和编码过程中的步骤。
第一章 海思SDK编码之sample_venc.c解析
海思SDK系列代码解析
提示：以下是本篇文章正文内容，下面案例可供参考
/******************************************************************************
A simple program of Hisilicon HI3531 video encode implementation.
Copyright ©, 2010-2011, Hisilicon Tech. Co., Ltd.
Modification: 2011-2 Created
*****************************************************************************/
#ifdef __cplusplus //__cplusplus是C++中定义的一个宏，如果这个宏被定义，说明这个程序是C++程序
#if __cplusplus //那么如果C++程序要调用C实现的函数或库等，则需要使用extern “C”{
extern “C”{ //这是实现C++调用C库或函数的一种手段，原因是因为C++和C语言的编译器不同导致
#endif
#endif / End of #ifdef __cplusplus */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include “sample_comm.h”
//VIDEO_NORM_E gs_enNorm = VIDEO_ENCODING_MODE_PAL; //PAL(德国制@25帧)，中国主要也是使用这种。
VIDEO_NORM_E gs_enNorm = VIDEO_ENCODING_MODE_NTSC; //NTSC(美国制@30帧)，(来自网络)更换N制的镜头后，VI VO的属性都要设置成N制的
//VIDEO_NORM_E gs_enNorm = VIDEO_ENCODING_MODE_AUTO,
//VIDEO_NORM_E gs_enNorm = VIDEO_ENCODING_MODE_BUTT;
#ifdef hi3518ev201
HI_U32 g_u32BlkCnt = 4;
#endif
#ifdef hi3518ev200
HI_U32 g_u32BlkCnt = 4; //啥意思？块大小？
#endif
#ifdef hi3516cv200
HI_U32 g_u32BlkCnt = 10;
#endif
//2018.06.02
/******************************************************************************
-
function : show usage 介绍使用方法
/
void SAMPLE_VENC_Usage(char sPrgNm) //接收的字符串为argv[0]
{
printf(“Usage : %s \n”, sPrgNm); //string program number
printf(“index:\n”);
printf("\t 0) 11080p H264 + 1VGA H264.\n");
printf("\t 1) 11080p MJPEG encode + 11080p jpeg.\n");
printf(“\t 2) low delay encode(only vi-vpss online).\n”);
printf(“\t 3) roi background framerate.\n”);
printf("\t 4) Thumbnail of 11080p jpeg.\n");
#ifndef hi3518ev201
printf(“\t 5) svc-t H264\n”);
#endif
return;
}
//2018.06.02
/**** -
function : to process abnormal case 处理异常情况，譬如中断处理、结束进程
/
void SAMPLE_VENC_HandleSig(HI_S32 signo)
{
if (SIGINT == signo || SIGTERM == signo)
{
SAMPLE_COMM_ISP_Stop();
SAMPLE_COMM_SYS_Exit();
printf(“\033[0;31mprogram termination abnormally!\033[0;39m\n”);
}
exit(-1);
}
//2018.06.02
/ -
function : to process abnormal case - the case of stream venc 编码异常处理
******************************************************************************/
void SAMPLE_VENC_StreamHandleSig(HI_S32 signo)
{if (SIGINT == signo || SIGTSTP == signo)
{
SAMPLE_COMM_ISP_Stop();
SAMPLE_COMM_SYS_Exit();
printf(“\033[0;31mprogram exit abnormally!\033[0;39m\n”);
}exit(0);
}//2018.06.02
/******************************************************************************
-
function : H.264@1080p@30fps+H.264@VGA@30fps 支持同时编码2路码流
*****************************************************************************/
HI_S32 SAMPLE_VENC_1080P_CLASSIC(HI_VOID) / 最重要的函数 */
{
PAYLOAD_TYPE_E enPayLoad[3]= {PT_H264, PT_H264,PT_H264}; /*枚举类型、数组、3路码流的编码类型 /
PIC_SIZE_E enSize[3] = {PIC_HD1080, PIC_VGA,PIC_QVGA}; / 3路码流的分辨率 */
HI_U32 u32Profile = 0;VB_CONF_S stVbConf; /* 视频缓存池 */
SAMPLE_VI_CONFIG_S stViConfig = {0};VPSS_GRP VpssGrp; /* 这部分是和VPSS相关的 */
VPSS_CHN VpssChn;
VPSS_GRP_ATTR_S stVpssGrpAttr;
VPSS_CHN_ATTR_S stVpssChnAttr;
VPSS_CHN_MODE_S stVpssChnMode;VENC_CHN VencChn;
SAMPLE_RC_E enRcMode= SAMPLE_RC_CBR; /* 恒定比特率方式进行编码 / / H.264编码方式有好种，这是其中一种 */HI_S32 s32ChnNum=0;
HI_S32 s32Ret = HI_SUCCESS;
HI_U32 u32BlkSize;
SIZE_S stSize;
char c;/******************************************
step 1: init sys variable ## 1.这里的sys指“mpp”，指的是初始化mpp的变量 ##
****************************************/
memset(&stVbConf,0,sizeof(VB_CONF_S)); / 刷新缓存池/SAMPLE_COMM_VI_GetSizeBySensor(&enSize[0]); /* 获取SENSOR,在这个函数里面添加 /
if (PIC_HD1080 == enSize[0])
{
enSize[1] = PIC_VGA;
s32ChnNum = 2;
}
else if (PIC_HD720 == enSize[0]) / 走的是这条路 /
{
enSize[1] = PIC_VGA; / 通过对VI原始图像(720P)进行裁剪、缩放成这两路(VGA、QVGA) /
enSize[2] = PIC_QVGA;
s32ChnNum = 3; / 这里的3表示3路码流，分别是720P、VGA、QVGA */
}
else
{
printf(“not support this sensor\n”);
return HI_FAILURE;
}
#ifdef hi3518ev201
s32ChnNum = 1;
#endif
printf(“s32ChnNum = %d\n”,s32ChnNum);stVbConf.u32MaxPoolCnt = 128; /* 缓存池的数量为128 */
/video buffer/
if(s32ChnNum >= 1) /* 走这条通道 /
{ / “enSize”表示传进去是多少像素的，“SAMPLE_PIXEL_FORMAT”表示像素格式(RGB888或RGB565)
“SAMPLE_SYS_ALIGN_WIDTH”表示对齐*/
u32BlkSize = SAMPLE_COMM_SYS_CalcPicVbBlkSize(gs_enNorm,
enSize[0], SAMPLE_PIXEL_FORMAT, SAMPLE_SYS_ALIGN_WIDTH);
stVbConf.astCommPool[0].u32BlkSize = u32BlkSize;
stVbConf.astCommPool[0].u32BlkCnt = g_u32BlkCnt;
}
if(s32ChnNum >= 2)
{
u32BlkSize = SAMPLE_COMM_SYS_CalcPicVbBlkSize(gs_enNorm,
enSize[1], SAMPLE_PIXEL_FORMAT, SAMPLE_SYS_ALIGN_WIDTH);
stVbConf.astCommPool[1].u32BlkSize = u32BlkSize;
stVbConf.astCommPool[1].u32BlkCnt =g_u32BlkCnt;
}
if(s32ChnNum >= 3) /* */
{
u32BlkSize = SAMPLE_COMM_SYS_CalcPicVbBlkSize(gs_enNorm,
enSize[2], SAMPLE_PIXEL_FORMAT, SAMPLE_SYS_ALIGN_WIDTH);
stVbConf.astCommPool[2].u32BlkSize = u32BlkSize;
stVbConf.astCommPool[2].u32BlkCnt = g_u32BlkCnt;
}/******************************************
step 2: mpp system init. ## 2.初始化MMP系统 ##
*****************************************/
s32Ret = SAMPLE_COMM_SYS_Init(&stVbConf);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“system init failed with %d!\n”, s32Ret);
goto END_VENC_1080P_CLASSIC_0; / 倒影式处理，MPP初始化失败直接结束编码 */
}/******************************************
step 3: start vi dev & chn to capture ## 3.启动输入和通道捕获 ##
*****************************************/
stViConfig.enViMode = SENSOR_TYPE;
stViConfig.enRotate = ROTATE_NONE; / 图像不旋转 /
stViConfig.enNorm = VIDEO_ENCODING_MODE_AUTO; / 图像制式标准 /
stViConfig.enViChnSet = VI_CHN_SET_NORMAL; / /
stViConfig.enWDRMode = WDR_MODE_NONE; / 不支持宽动态 */
s32Ret = SAMPLE_COMM_VI_StartVi(&stViConfig);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“start vi failed!\n”);
goto END_VENC_1080P_CLASSIC_1;
}/******************************************
step 4: start vpss and vi bind vpss ##4：启动视频处理和绑定视频输入(通道)##
*****************************************/
s32Ret = SAMPLE_COMM_SYS_GetPicSize(gs_enNorm, enSize[0], &stSize);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“SAMPLE_COMM_SYS_GetPicSize failed!\n”);
goto END_VENC_1080P_CLASSIC_1;
}
if(s32ChnNum >= 1) / 走这个通道 */
{
VpssGrp = 0;
stVpssGrpAttr.u32MaxW = stSize.u32Width;
stVpssGrpAttr.u32MaxH = stSize.u32Height;
stVpssGrpAttr.bIeEn = HI_FALSE;
stVpssGrpAttr.bNrEn = HI_TRUE;
stVpssGrpAttr.bHistEn = HI_FALSE;
stVpssGrpAttr.bDciEn = HI_FALSE;
stVpssGrpAttr.enDieMode = VPSS_DIE_MODE_NODIE;
stVpssGrpAttr.enPixFmt = PIXEL_FORMAT_YUV_SEMIPLANAR_420;s32Ret = SAMPLE_COMM_VPSS_StartGroup(VpssGrp, &stVpssGrpAttr); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Start Vpss failed!\n"); goto END_VENC_1080P_CLASSIC_2; } s32Ret = SAMPLE_COMM_VI_BindVpss(stViConfig.enViMode); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Vi bind Vpss failed!\n"); goto END_VENC_1080P_CLASSIC_3; } VpssChn = 0; stVpssChnMode.enChnMode = VPSS_CHN_MODE_USER; stVpssChnMode.bDouble = HI_FALSE; stVpssChnMode.enPixelFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420; stVpssChnMode.u32Width = stSize.u32Width; stVpssChnMode.u32Height = stSize.u32Height; stVpssChnMode.enCompressMode = COMPRESS_MODE_SEG; memset(&stVpssChnAttr, 0, sizeof(stVpssChnAttr)); stVpssChnAttr.s32SrcFrameRate = -1; stVpssChnAttr.s32DstFrameRate = -1; s32Ret = SAMPLE_COMM_VPSS_EnableChn(VpssGrp, VpssChn, &stVpssChnAttr, &stVpssChnMode, HI_NULL); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Enable vpss chn failed!\n"); goto END_VENC_1080P_CLASSIC_4; }}
if(s32ChnNum >= 2)
{
s32Ret = SAMPLE_COMM_SYS_GetPicSize(gs_enNorm, enSize[1], &stSize);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“SAMPLE_COMM_SYS_GetPicSize failed!\n”);
goto END_VENC_1080P_CLASSIC_4;
}
VpssChn = 1;
stVpssChnMode.enChnMode = VPSS_CHN_MODE_USER;
stVpssChnMode.bDouble = HI_FALSE;
stVpssChnMode.enPixelFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420;
stVpssChnMode.u32Width = stSize.u32Width;
stVpssChnMode.u32Height = stSize.u32Height;
stVpssChnMode.enCompressMode = COMPRESS_MODE_SEG;
stVpssChnAttr.s32SrcFrameRate = -1;
stVpssChnAttr.s32DstFrameRate = -1;
s32Ret = SAMPLE_COMM_VPSS_EnableChn(VpssGrp, VpssChn, &stVpssChnAttr, &stVpssChnMode, HI_NULL);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“Enable vpss chn failed!\n”);
goto END_VENC_1080P_CLASSIC_4;
}
}if(s32ChnNum >= 3)
{
s32Ret = SAMPLE_COMM_SYS_GetPicSize(gs_enNorm, enSize[2], &stSize);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“SAMPLE_COMM_SYS_GetPicSize failed!\n”);
goto END_VENC_1080P_CLASSIC_4;
}
VpssChn = 2;
stVpssChnMode.enChnMode = VPSS_CHN_MODE_USER;
stVpssChnMode.bDouble = HI_FALSE;
stVpssChnMode.enPixelFormat = PIXEL_FORMAT_YUV_SEMIPLANAR_420;
stVpssChnMode.u32Width = stSize.u32Width;
stVpssChnMode.u32Height = stSize.u32Height;
stVpssChnMode.enCompressMode = COMPRESS_MODE_NONE;stVpssChnAttr.s32SrcFrameRate = -1; stVpssChnAttr.s32DstFrameRate = -1; s32Ret = SAMPLE_COMM_VPSS_EnableChn(VpssGrp, VpssChn, &stVpssChnAttr, &stVpssChnMode, HI_NULL); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Enable vpss chn failed!\n"); goto END_VENC_1080P_CLASSIC_4; }}
/******************************************
step 5: start stream venc # 可以在这里叠加OSD信息，并研究哪些码流 #
***************************************/
/ HD1080P **/
printf(“\t c) cbr.\n”);
printf(“\t v) vbr.\n”);
printf(“\t f) fixQp\n”);
printf(“please input choose rc mode!\n”);
c = (char)getchar();
switch©
{
case ‘c’:
enRcMode = SAMPLE_RC_CBR;
break;
case ‘v’:
enRcMode = SAMPLE_RC_VBR;
break;
case ‘f’:
enRcMode = SAMPLE_RC_FIXQP;
break;
default:
printf(“rc mode! is invaild!\n”);
goto END_VENC_1080P_CLASSIC_4;
}/*** enSize[0] **/
if(s32ChnNum >= 1)
{
VpssGrp = 0;
VpssChn = 0; / 媒体处理通道0 /
VencChn = 0; / 编码通道0 *//* 通道0、负载类型PT_H264、NTSC制式、PIC_HD1080()、恒定比特率编码、0 */ s32Ret = SAMPLE_COMM_VENC_Start(VencChn, enPayLoad[0],\ gs_enNorm, enSize[0], enRcMode,u32Profile); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Start Venc failed!\n"); goto END_VENC_1080P_CLASSIC_5; } s32Ret = SAMPLE_COMM_VENC_BindVpss(VencChn, VpssGrp, VpssChn); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Start Venc failed!\n"); goto END_VENC_1080P_CLASSIC_5; }}
/*** enSize[1] */
if(s32ChnNum >= 2)
{
VpssChn = 1; / 媒体处理通道1 /
VencChn = 1; / 编码通道1 /
/ 通道1、负载类型PT_H264、NTSC制式、PIC_VGA(640 * 480)、恒定比特率编码、0 */
s32Ret = SAMPLE_COMM_VENC_Start(VencChn, enPayLoad[1],
gs_enNorm, enSize[1], enRcMode,u32Profile);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“Start Venc failed!\n”);
goto END_VENC_1080P_CLASSIC_5;
}s32Ret = SAMPLE_COMM_VENC_BindVpss(VencChn, VpssGrp, VpssChn); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Start Venc failed!\n"); goto END_VENC_1080P_CLASSIC_5; }}
/*** enSize[2] */
if(s32ChnNum >= 3)
{
VpssChn = 2; / 媒体处理通道2 /
VencChn = 2; / 编码通道2 /
/ 通道2、负载类型PT_H264、NTSC制式、PIC_QVGA(320 * 240)、恒定比特率编码、0 */
s32Ret = SAMPLE_COMM_VENC_Start(VencChn, enPayLoad[2],
gs_enNorm, enSize[2], enRcMode,u32Profile);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“Start Venc failed!\n”);
goto END_VENC_1080P_CLASSIC_5;
}s32Ret = SAMPLE_COMM_VENC_BindVpss(VencChn, VpssGrp, VpssChn); if (HI_SUCCESS != s32Ret) { SAMPLE_PRT("Start Venc failed!\n"); goto END_VENC_1080P_CLASSIC_5; }}
/******************************************
step 6: stream venc process – get stream, then save it to file.
*****************************************/
s32Ret = SAMPLE_COMM_VENC_StartGetStream(u32ViChnCnt2);
if (HI_SUCCESS != s32Ret)
{
SAMPLE_PRT(“Start Venc failed!\n”);
goto END_VENC_16D1_3;
}printf(“please press twice ENTER to exit this sample\n”);
getchar();
getchar();/******************************************
step 8: exit process
******************************************/
SAMPLE_COMM_VENC_StopGetStream();
END_VENC_16D1_3:
for (i=0; i<u32ViChnCnt*2; i++)
{
VencGrp = i;
VencChn = i;
VpssGrp = i/2;
VpssChn = (VpssGrp%2)?VPSS_PRE0_CHN:VPSS_BSTR_CHN;
SAMPLE_COMM_VENC_UnBindVpss(VencGrp, VpssGrp, VpssChn);
SAMPLE_COMM_VENC_Stop(VencGrp,VencChn);
}
SAMPLE_COMM_VI_UnBindVpss(enViMode);
END_VENC_16D1_2: //vpss stop
SAMPLE_COMM_VPSS_Stop(s32VpssGrpCnt, VPSS_MAX_CHN_NUM);
END_VENC_16D1_1: //vi stop
SAMPLE_COMM_VI_Stop(enViMode);
END_VENC_16D1_0: //system exit
SAMPLE_COMM_SYS_Exit();
return s32Ret;
}
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