Linux下安装FFMPEG 编译 以及基本的Demo开发_ffbuild/library.mak:119

(windows下编译ffmpeg   http://bbs.chinavideo.org/viewthread.php?tid=1897&extra=page%3D1)

1.首先去官网下载ffmpeg最新版ffmpeg.2.3.1 version

2.复制    ffmpeg.2.3.1.tar.bz2 到/root/kmcflyCode/目录下

3.解压包. tar -xjfv ffmpeg.2.3.1.tar.bz2 到目录下

4.配置ffmpeg ----配置,生成Makefile
./configure --enable-shared --disable-yasm --prefix=/usr/local/ffmpeg

5.make

(假如此时出现编译错误

ln: creating symbolic link `libavutil.so' to `libavutil.so.50': 

Operation not supported 

make: *** [libavutil/libavutil.so] Error 1

ln: creating symbolic link `libavutil.so' to `libavutil.so.50': 

Operation not supported 

make: *** [libavutil/libavutil.so] Error 1

ln :failed to create symbolic link 'libavutil.so'，则是因为当前文件夹是windows共享过来的 需要链接目录，导致权限出错，解决方法：把ffmpeg.2.3.1.tar.bz2 拷贝到Linux 目录而非从Windows共享的目录，Windows共享目录

mount -t vboxsf share /mnt/nfs/ 把Windows  share共享文件夹 挂在到/mnt/nfs/目录)

6.make install

以上步骤执行完毕，则在/usr/local/ffmpeg/目录下生成了 lib include bin 文件夹，为使自己的程序调用方便，把lib动态库目录文件复制到自己的工程文件夹，然后把Include中的几个文件夹复制到/usr/include/目录中，，即系统默认头文件搜索目录

(若在/usr/local/ffmpeg/bin 目录下 执行ffmpeg 命令出错，

ffmpeg: error while loading shared libraries: libavdevice.so.53: cannot open shared object file: No such file or directory

解决办法：

vi /etc/ld.so.conf

加入：/usr/local/lib

执行ldconfig

)

7.建立自己的工程文件目录   Src(自己的源文件夹)   lib(ffmpeg 库文件目录，包含ffmpeg include 和lib动态库文件夹)  Maintest(测试程序目录，存放测试文件，以及makefile 编译规则)

makefile:

CC=g++
 
#工作路径定义
CURRENT_PATH=./
WORK_DIR_PATH=..
MAIN_TEST_PATH=$(CURRENT_PATH)
FFMPEG_PATH=$(WORK_DIR_PATH)/lib
FFMPEG_INTERFACE_PATH=$(WORK_DIR_PATH)/Src
#库文件路径定义
LINK_LIB_PATH=$(WORK_DIR_PATH)/lib/lib
 
#头文件定义路径
FFMPEG_H=$(FFMPEG_PATH)/include
FFMPEG_INTERFACE_H=$(WORK_DIR_PATH)/Inc
 
 
#源文件路径定义
FFMPEG_INTERFACE_SRC = $(wildcard $(FFMPEG_INTERFACE_PATH)/*.cpp)
MAIN_TEST_SRC=$(wildcard $(MAIN_TEST_PATH)/*.cpp)
#编译中间文件定义
FFMPEG_INTERFACE_OBJ = $(FFMPEG_INTERFACE_SRC:.cpp=.o)
MAIN_TEST_OBJ = $(MAIN_TEST_SRC:.cpp=.o)
#编译选项
CXXFLAGS = -I$(FFMPEG_H) -I$(FFMPEG_INTERFACE_H) -L $(LINK_LIB_PATH)
#CXXFLAGS = -I$(FFMPEG_INTERFACE_H)
#echo $(CXXFLAGS)
# -WI,-Bstatic -$(mysqlName) -WI,-Bdynamic -lpthread -ldl -lrt
app:$(FFMPEG_INTERFACE_OBJ) $(MAIN_TEST_OBJ)
	$(CC) -o app $(CXXFLAGS)	$(FFMPEG_INTERFACE_OBJ) $(MAIN_TEST_OBJ)	$(LINK_LIB_PATH)/libswscale.so $(LINK_LIB_PATH)/libavutil.so.52  -WI,-Bdynamic -lavformat -lavcodec  -ldl -lrt
$(FFMPEG_INTERFACE_OBJ):%.o:%.cpp
	$(CC) -c $(CXXFLAGS) $< -o $@
$(MAIN_TEST_OBJ):%.o:%.cpp
	$(CC) -c $(CXXFLAGS) $< -o $@ 
#	 g++ -c main.o main.cpp -I ../lib/include/
#	
clean:
	rm -f $(FFMPEG_INTERFACE_OBJ) $(MAIN_TEST_OBJ) 
	

main.cpp测试代码：

#include <stdio.h>
 
#ifndef   UINT64_C
#define   UINT64_C(value)__CONCAT(value,ULL)
#endif
 
extern "C"
{
#include "../lib/include/libavformat/avformat.h"
#include "../lib/include/libswscale/swscale.h"
 
}
#include <iostream>
#include "../Inc/ffmpegInterface.h"
 
 
 
 
using namespace std;
CFfmpegInterface myffmpegInterface;
 
typedef unsigned short u_int16_t;
typedef unsigned int u_int32_t;
#pragma pack(2)
 
typedef struct BITMAPFILEHEADER  
{   
    u_int16_t bfType;   
    u_int32_t bfSize;   
    u_int16_t bfReserved1;   
    u_int16_t bfReserved2;   
    u_int32_t bfOffBits;   
}BITMAPFILEHEADER;   
 #pragma pack() 
 
 #pragma pack(2)
typedef struct BITMAPINFOHEADER  
{   
    u_int32_t biSize;   
    u_int32_t biWidth;   
    u_int32_t biHeight;   
    u_int16_t biPlanes;   
    u_int16_t biBitCount;   
    u_int32_t biCompression;   
    u_int32_t biSizeImage;   
    u_int32_t biXPelsPerMeter;   
    u_int32_t biYPelsPerMeter;   
    u_int32_t biClrUsed;   
    u_int32_t biClrImportant;   
}BITMAPINFODEADER;  
#pragma pack()
 
int img_convert(AVPicture *dst, enum AVPixelFormat dst_pix_fmt,
                const AVPicture *src, enum AVPixelFormat src_pix_fmt,
                int src_width, int src_height)
{
    int w;
    int h;
    SwsContext *pSwsCtx;
    w = src_width;
    h = src_height;
    pSwsCtx = sws_getContext(w, h, src_pix_fmt, w, h, dst_pix_fmt,SWS_BICUBIC, NULL, NULL, NULL);
    sws_scale(pSwsCtx, src->data, src->linesize,0, h, dst->data, dst->linesize);
 
    //这里释放掉pSwsCtx的内存
 
    return 0;
}
int CreateBmp(const char *filename, uint8_t *pRGBBuffer, int width, int height, int bpp)  
{  
	 BITMAPFILEHEADER bmpheader;  
	 BITMAPINFOHEADER bmpinfo;  
	 FILE *fp = NULL;  
	  
	 fp = fopen(filename,"wb");  
	 if( fp == NULL )  
	 {  
	  return -1;  
	 }  
	  
	 bmpheader.bfType = ('M' <<8)|'B';  
	 bmpheader.bfReserved1 = 0;  
	 bmpheader.bfReserved2 = 0;  
	 bmpheader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  
	 bmpheader.bfSize = bmpheader.bfOffBits + width*height*bpp/8;  
	  
	 bmpinfo.biSize = sizeof(BITMAPINFOHEADER);  
	 bmpinfo.biWidth = width;  
	 bmpinfo.biHeight = 0 - height;  
	 bmpinfo.biPlanes = 1;  
	 bmpinfo.biBitCount = bpp;  
	 bmpinfo.biCompression = 0;  
	 bmpinfo.biSizeImage = 0;  
	 bmpinfo.biXPelsPerMeter = 100;  
	 bmpinfo.biYPelsPerMeter = 100;  
	 bmpinfo.biClrUsed = 0;  
	 bmpinfo.biClrImportant = 0;  
	  
	 fwrite(&bmpheader,sizeof(BITMAPFILEHEADER),1,fp);  
	 fwrite(&bmpinfo,sizeof(BITMAPINFOHEADER),1,fp);  
	 fwrite(pRGBBuffer,width*height*bpp/8,1,fp);  
	 fclose(fp);  
	 fp = NULL;  
	  
	 return 0;  
}
 
 
int DecodeVideo()
{
		//打开视频文件
	AVFormatContext *pFormatCtx=NULL;
	const char *filename = "music.mp4";
	int videoStream=-1;
	int i;
	AVFrame *pFrameRGB=NULL;
	AVFrame *pFrame=NULL;
 
	
	uint8_t *buffer=NULL;
	int numBytes;
 
	AVCodec *pCodec=NULL;
	AVCodecContext *pCodecCtx=NULL;
 
	int frameFinished;
    AVPacket packet;
 
	unsigned int bmpi=0;
	char BmpName[40] ={0};
	//注册所有的编解码器
 
	av_register_all();
	
	while(1)
		{
		 //打开文件
		if(avformat_open_input(&pFormatCtx,filename,NULL,NULL)!=0)
			{//这一步会用有效的信息把 AVFormatContext填满
				printf("####error: av_Open_input_file error \n");
				return 0;
			}
		// Retrieve stream information
		if(av_find_stream_info(pFormatCtx)<0)
			{
				cout<<"find stream info error"<<endl;
				return -1; // Couldn't find stream information
			}
 
	
		videoStream=-1;
		for(i=0; i<pFormatCtx->nb_streams; i++)
			{
				 if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)//CODEC_TYPE_VIDEO
					{
					 	videoStream=i;
						break;
					}
			}
		if(videoStream==-1)
		 return -1; // Didn't find a video stream
	
		 //找到解码器
		pCodecCtx=pFormatCtx->streams[videoStream]->codec;
		pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
		
		if(pCodec==NULL) 
			{
				fprintf(stderr, "Unsupported codec!\n");
				return -1; // Codec not found
			}
		if(pCodec->capabilities&CODEC_CAP_TRUNCATED)
			pCodecCtx->flags|=CODEC_FLAG_TRUNCATED;
		// 打开解码器
		if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
		  return -1; // Could not open codec
	
		 
	
	
	
	
		// Allocate video frame
		pFrame=avcodec_alloc_frame();
		// Allocate an AVFrame structure
		pFrameRGB=avcodec_alloc_frame();
		if(pFrameRGB==NULL)
			return -1;
		// Determine required buffer size and allocate buffer
		numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,pCodecCtx->height);
		buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
	
		// Assign appropriate parts of buffer to image planes in pFrameRGB
	// Note that pFrameRGB is an AVFrame, but AVFrame is a superset
	// of AVPicture
		avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,pCodecCtx->width, pCodecCtx->height);
	
	//	CreateBmp("SaveBmp.bmp", buffer,pCodecCtx->width, pCodecCtx->height, 24);
		i=0;
	
	while(av_read_frame(pFormatCtx, &packet)>=0) 
		{
			  //是视频帧吗
			  if(packet.stream_index==videoStream) 
				{
				//ffmpeg中的avcodec_decode_video2()的作用是解码一帧视频数据。输入一个压缩编码的结构体AVPacket，输出一个解码后的结构体AVFrame
				avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,&packet);
			   
				// Did we get a video frame?
				if(frameFinished) 
					{
						//yuv数据
						pFrame->data[0] += pFrame->linesize[0] * (pCodecCtx->height - 1);
					    pFrame->linesize[0] *= -1;
					    pFrame->data[1] += pFrame->linesize[1] * (pCodecCtx->height / 2 - 1);
					    pFrame->linesize[1] *= -1;
					    pFrame->data[2] += pFrame->linesize[2] * (pCodecCtx->height / 2 - 1);
					    pFrame->linesize[2] *= -1;
					    
					 //   sws_scale (pSwsCtx, pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameRGB->data, pFrameRGB->linesize);
					// Convert the image from its native(YUV FMT) format to RGB
						img_convert((AVPicture *)pFrameRGB, AV_PIX_FMT_BGR24,(AVPicture*)pFrame, pCodecCtx->pix_fmt,pCodecCtx->width, pCodecCtx->height);
	
						//这个函数的使用本质上是为已经分配的空间的结构体AVPicture挂上一段用于保存数据的空间，这个结构体中有一个指针数组data[4]，挂在这个数组里
			//			avpicture_fill((AVPicture *)pFrame, buffer, PIX_FMT_BGR24,pCodecCtx->width, pCodecCtx->height);
						
						sprintf(BmpName,"%s_%d.bmp","SaveBmp",bmpi);
						bmpi++;
						cout<<"decode one frame "<<endl;
						CreateBmp(BmpName, buffer,pCodecCtx->width, pCodecCtx->height, 24);
						
						//SaveVideoFile("SaveVideo.rgb24", buffer,pCodecCtx->width, pCodecCtx->height, 24);
						// Save the frame to disk
					   // if(++i<=5)
						//	SaveFrame(pFrameRGB, pCodecCtx->width,
						 // 		  pCodecCtx->height, i);
					}
			  }
	
				// Free the packet that was allocated by av_read_frame
			  av_free_packet(&packet);
		}
		avcodec_close(pCodecCtx);
		av_close_input_file(pFormatCtx);
		pCodecCtx = NULL;
		pFormatCtx = NULL;
		cout<<"the video file was decoded over..."<<endl;
		break;
		}
	return 0;	
}
 
int main(int argc,char **argv)
{
 
	DecodeVideo();
	
	cout<<"kll"<<endl;
	while(1);
	AVFormatContext *pFormatCtx=NULL;
	const char *filename = "20101013093728.avi";
 
 
	av_register_all();
	cout<<"run herer"<<endl;
	 //打开文件
	 int err_code;
	 char buf[20];
	if(err_code=avformat_open_input(&pFormatCtx,filename,NULL,NULL))
		{//这一步会用有效的信息把 AVFormatContext填满
			av_strerror(err_code, buf, 1024);
   			printf("Couldn't open file %s: %d(%s)", filename, err_code, buf);
			return 0;
		}
	else
		cout<<"open file success"<<endl;
	cout<<"run over"<<endl;
	return 0;
}

以上代码可解码一个视频文件，并把视频数据封装成.bmp格式图片 存放。。。