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

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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