NVIDIA Jetson TX1 系列开发教程之七：FFMPEG安装与测试

  • 转载请注明作者和出处：http://blog.csdn.net/u011475210
  • 嵌入式平台：NVIDIA Jetson TX1
  • 嵌入式系统：Ubuntu16.04
  • 虚拟机系统：Ubuntu14.04
  • 编者: WordZzzz

纪念雷神
雷神在中国视音频领域影响深远，值此纪念日，缅怀雷神。

——分割线——

前言：
本人需要在NVIDIA TX1上通过USB摄像头实现拍照和预览功能，奈何自己买的USB摄像头的YUYV格式只有640*480这么一种分辨率，JPEG格式下的分辨率倒是很多。现在TX1上面的多媒体例程已经更新到第12个：12_camera_v4l2_cuda。但是本人不才，还是没有在nvcc中找到与V4L2中的MJPEG对应的format格式，期间还搞过一段时间的Gstreamer，但是只能单独实现预览或者拍照功能，再往深了就不会写了，资料太少了。挣扎许久之后还是放弃了，转战Ffmpeg。其实Gstreamer和Ffmpeg这两者挺像的，都是先用命令行测试之后再码代码，但是Gstreamer包括晦涩难懂的OBJECT编程，最起码我学起来很吃力，以后有精力了再尝试吧。

一、Ffmpeg安装：
1.安装依赖：

sudo apt-get update
sudo apt-get -y install autoconf automake build-essential libass-dev libfreetype6-dev \
  libsdl2-dev libtheora-dev libtool libva-dev libvdpau-dev libvorbis-dev libxcb1-dev libxcb-shm0-dev \
  libxcb-xfixes0-dev pkg-config texinfo wget zlib1g-dev
sudo apt-get -y install yasm nasm libx264-dev libx265-dev libmp3lame-dev libopus-dev libvpx-dev

2.安装无法自动更新的libfdk-aac：

mkdir ~/ffmpeg_sources
cd ~/ffmpeg_sources
wget -O fdk-aac.tar.gz https://github.com/mstorsjo/fdk-aac/tarball/master
tar xzvf fdk-aac.tar.gz
cd mstorsjo-fdk-aac*
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install

3.安装：

cd ~/ffmpeg_sources
wget http://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  --prefix="$HOME/ffmpeg_build" \
  --pkg-config-flags="--static" \
  --extra-cflags="-I$HOME/ffmpeg_build/include" \
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  --bindir="$HOME/bin" \
  --enable-gpl \
  --enable-libass \
  --enable-libfdk-aac \
  --enable-libfreetype \
  --enable-libmp3lame \
  --enable-libopus \
  --enable-libtheora \
  --enable-libvorbis \
  --enable-libvpx \
  --enable-libx264 \
  --enable-libx265 \
  --enable-nonfree \
  --enable-shared
PATH="$HOME/bin:$PATH" make
make install
hash -r

二、SDL安装：
先简单再介绍一下SDL：SDL是Simple DirectMedia Layer（简易直控媒体层）的缩写。它是一个跨平台的多媒体库，以用于直接控制底层的多媒体硬件的接口。主要用在开发游戏上！

Ubuntu的新得立已经包含SDL库，所以通过几个简单的命令就可以安装，比windows还傻瓜！

sudo apt-get install libsdl1.2-dev

附加包：

sudo apt-get install libsdl-image1.2-dev

sudo apt-get install libsdl-mixer1.2-dev

sudo apt-get install libsdl-ttf2.0-dev

sudo apt-get install libsdl-gfx1.2-dev

三、测试：
这里用雷神的代码进行测试，Ffmpeg+SDL实现摄像头采集与显示。
先参考先前的博客在主机上用Nsight新建工程，然后进行配置，具体配置如下：

代码如下，代码原文链接：http://blog.csdn.net/leixiaohua1020/article/details/39702113

#include <stdio.h>

#define __STDC_CONSTANT_MACROS

#ifdef _WIN32
//Windows
extern "C"
{
#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"
#include "libswscale/swscale.h"
#include "libavdevice/avdevice.h"
#include "SDL/SDL.h"
};
#else
//Linux...
#ifdef __cplusplus
extern "C"
{
#endif
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavdevice/avdevice.h>
#include <SDL/SDL.h>
#ifdef __cplusplus
};
#endif
#endif

//Output YUV420P 
#define OUTPUT_YUV420P 0
//'1' Use Dshow 
//'0' Use VFW
#define USE_DSHOW 0


//Refresh Event
#define SFM_REFRESH_EVENT  (SDL_USEREVENT + 1)

#define SFM_BREAK_EVENT  (SDL_USEREVENT + 2)

int thread_exit=0;

int sfp_refresh_thread(void *opaque)
{
    thread_exit=0;
    while (!thread_exit) {
        SDL_Event event;
        event.type = SFM_REFRESH_EVENT;
        SDL_PushEvent(&event);
        SDL_Delay(40);
    }
    thread_exit=0;
    //Break
    SDL_Event event;
    event.type = SFM_BREAK_EVENT;
    SDL_PushEvent(&event);

    return 0;
}


//Show Dshow Device
void show_dshow_device(){
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options = NULL;
    av_dict_set(&options,"list_devices","true",0);
    AVInputFormat *iformat = av_find_input_format("dshow");
    printf("========Device Info=============\n");
    avformat_open_input(&pFormatCtx,"video=dummy",iformat,&options);
    printf("================================\n");
}

//Show Dshow Device Option
void show_dshow_device_option(){
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options = NULL;
    av_dict_set(&options,"list_options","true",0);
    AVInputFormat *iformat = av_find_input_format("dshow");
    printf("========Device Option Info======\n");
    avformat_open_input(&pFormatCtx,"video=Integrated Camera",iformat,&options);
    printf("================================\n");
}

//Show VFW Device
void show_vfw_device(){
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVInputFormat *iformat = av_find_input_format("vfwcap");
    printf("========VFW Device Info======\n");
    avformat_open_input(&pFormatCtx,"list",iformat,NULL);
    printf("=============================\n");
}

//Show AVFoundation Device
void show_avfoundation_device(){
    AVFormatContext *pFormatCtx = avformat_alloc_context();
    AVDictionary* options = NULL;
    av_dict_set(&options,"list_devices","true",0);
    AVInputFormat *iformat = av_find_input_format("avfoundation");
    printf("==AVFoundation Device Info===\n");
    avformat_open_input(&pFormatCtx,"",iformat,&options);
    printf("=============================\n");
}


int main(int argc, char* argv[])
{

    AVFormatContext *pFormatCtx;
    int             i, videoindex;
    AVCodecContext  *pCodecCtx;
    AVCodec         *pCodec;

    av_register_all();
    avformat_network_init();
    pFormatCtx = avformat_alloc_context();

    //Open File
    //char filepath[]="src01_480x272_22.h265";
    //avformat_open_input(&pFormatCtx,filepath,NULL,NULL)

    //Register Device
    avdevice_register_all();

//Windows
#ifdef _WIN32

    //Show Dshow Device
    show_dshow_device();
    //Show Device Options
    show_dshow_device_option();
    //Show VFW Options
    show_vfw_device();

#if USE_DSHOW
    AVInputFormat *ifmt=av_find_input_format("dshow");
    //Set own video device's name
    if(avformat_open_input(&pFormatCtx,"video=Integrated Camera",ifmt,NULL)!=0){
        printf("Couldn't open input stream.\n");
        return -1;
    }
#else
    AVInputFormat *ifmt=av_find_input_format("vfwcap");
    if(avformat_open_input(&pFormatCtx,"0",ifmt,NULL)!=0){
        printf("Couldn't open input stream.\n");
        return -1;
    }
#endif
#elif defined linux
    //Linux
    AVInputFormat *ifmt=av_find_input_format("video4linux2");
    if(avformat_open_input(&pFormatCtx,"/dev/video0",ifmt,NULL)!=0){
        printf("Couldn't open input stream.\n");
        return -1;
    }
#else
    show_avfoundation_device();
    //Mac
    AVInputFormat *ifmt=av_find_input_format("avfoundation");
    //Avfoundation
    //[video]:[audio]
    if(avformat_open_input(&pFormatCtx,"0",ifmt,NULL)!=0){
        printf("Couldn't open input stream.\n");
        return -1;
    }
#endif


    if(avformat_find_stream_info(pFormatCtx,NULL)<0)
    {
        printf("Couldn't find stream information.\n");
        return -1;
    }
    videoindex=-1;
    for(i=0; i<pFormatCtx->nb_streams; i++) 
        if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
        {
            videoindex=i;
            break;
        }
    if(videoindex==-1)
    {
        printf("Couldn't find a video stream.\n");
        return -1;
    }
    pCodecCtx=pFormatCtx->streams[videoindex]->codec;
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    if(pCodec==NULL)
    {
        printf("Codec not found.\n");
        return -1;
    }
    if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
    {
        printf("Could not open codec.\n");
        return -1;
    }
    AVFrame *pFrame,*pFrameYUV;
    pFrame=av_frame_alloc();
    pFrameYUV=av_frame_alloc();
    //unsigned char *out_buffer=(unsigned char *)av_malloc(avpicture_get_size(AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height));
    //avpicture_fill((AVPicture *)pFrameYUV, out_buffer, AV_PIX_FMT_YUV420P, pCodecCtx->width, pCodecCtx->height);
    //SDL----------------------------
    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_TIMER)) {  
        printf( "Could not initialize SDL - %s\n", SDL_GetError()); 
        return -1;
    } 
    int screen_w=0,screen_h=0;
    SDL_Surface *screen; 
    screen_w = pCodecCtx->width;
    screen_h = pCodecCtx->height;
    screen = SDL_SetVideoMode(screen_w, screen_h, 0,0);

    if(!screen) {  
        printf("SDL: could not set video mode - exiting:%s\n",SDL_GetError());  
        return -1;
    }
    SDL_Overlay *bmp; 
    bmp = SDL_CreateYUVOverlay(pCodecCtx->width, pCodecCtx->height,SDL_YV12_OVERLAY, screen); 
    SDL_Rect rect;
    rect.x = 0;    
    rect.y = 0;    
    rect.w = screen_w;    
    rect.h = screen_h;  
    //SDL End------------------------
    int ret, got_picture;

    AVPacket *packet=(AVPacket *)av_malloc(sizeof(AVPacket));

#if OUTPUT_YUV420P 
    FILE *fp_yuv=fopen("output.yuv","wb+");  
#endif  

    struct SwsContext *img_convert_ctx;
    img_convert_ctx = sws_getContext(pCodecCtx->width, pCodecCtx->height, pCodecCtx->pix_fmt, pCodecCtx->width, pCodecCtx->height, AV_PIX_FMT_YUV420P, SWS_BICUBIC, NULL, NULL, NULL); 
    //------------------------------
    SDL_Thread *video_tid = SDL_CreateThread(sfp_refresh_thread,NULL);
    //
    SDL_WM_SetCaption("Simplest FFmpeg Read Camera",NULL);
    //Event Loop
    SDL_Event event;

    for (;;) {
        //Wait
        SDL_WaitEvent(&event);
        if(event.type==SFM_REFRESH_EVENT){
            //------------------------------
            if(av_read_frame(pFormatCtx, packet)>=0){
                if(packet->stream_index==videoindex){
                    ret = avcodec_decode_video2(pCodecCtx, pFrame, &got_picture, packet);
                    if(ret < 0){
                        printf("Decode Error.\n");
                        return -1;
                    }
                    if(got_picture){
                        SDL_LockYUVOverlay(bmp);
                        pFrameYUV->data[0]=bmp->pixels[0];
                        pFrameYUV->data[1]=bmp->pixels[2];
                        pFrameYUV->data[2]=bmp->pixels[1];     
                        pFrameYUV->linesize[0]=bmp->pitches[0];
                        pFrameYUV->linesize[1]=bmp->pitches[2];   
                        pFrameYUV->linesize[2]=bmp->pitches[1];
                        sws_scale(img_convert_ctx, (const unsigned char* const*)pFrame->data, pFrame->linesize, 0, pCodecCtx->height, pFrameYUV->data, pFrameYUV->linesize);

#if OUTPUT_YUV420P  
                        int y_size=pCodecCtx->width*pCodecCtx->height;    
                        fwrite(pFrameYUV->data[0],1,y_size,fp_yuv);    //Y   
                        fwrite(pFrameYUV->data[1],1,y_size/4,fp_yuv);  //U  
                        fwrite(pFrameYUV->data[2],1,y_size/4,fp_yuv);  //V  
#endif  

                        SDL_UnlockYUVOverlay(bmp); 

                        SDL_DisplayYUVOverlay(bmp, &rect); 

                    }
                }
                av_free_packet(packet);
            }else{
                //Exit Thread
                thread_exit=1;
            }
        }else if(event.type==SDL_QUIT){
            thread_exit=1;
        }else if(event.type==SFM_BREAK_EVENT){
            break;
        }

    }


    sws_freeContext(img_convert_ctx);

#if OUTPUT_YUV420P 
    fclose(fp_yuv);
#endif 

    SDL_Quit();

    //av_free(out_buffer);
    av_free(pFrameYUV);
    avcodec_close(pCodecCtx);
    avformat_close_input(&pFormatCtx);

    return 0;
}

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完的汪(∪｡∪)｡｡｡zzz

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