libvlc获取一帧_用libvlc 抓取解码后的帧数据

Myth丶恋晨 2023-01-01 05:47 276阅读 0赞

\#include "stdafx.h"\#include\#include"vlc/vlc.h"\#include\#include\#include\#includeQMutex g\_mutex;bool g\_isInit = false;int IMG\_WIDTH = 640;int IMG\_HEIGHT = 480;char in\_buffer\[640\*480\*4\];char out\_buffer\[640\*480\*4\];

FILE\*local;int frameNum = 0;const char\* TestFile = "b040\_20170106.dat";//

static void \*lock(void \*data, void \*\*p\_pixels)

g\_mutex.lock();\*p\_pixels = out\_buffer; /\*tell VLC to put decoded data to this buffer\*/

return 0; /\*picture identifier, not needed here\*/\}/\*\#\#get the argb picture AND save to file\*/

static void unlock(void \*data, void \*id, void \*const \*p\_pixels)

QImage image((unsignedchar\*)out\_buffer,640,480,QImage::Format\_ARGB32);

std::ostringstream oss;

oss<< "d:/img"

frameNum++;

image.save(oss.str().c\_str());

g\_mutex.unlock();

\}static void display(void \*data, void \*id)

\{/\*do not display the video\*/(void) data;

\}//

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

libvlc\_instance\_t\*inst;

libvlc\_media\_player\_t\*mp;

libvlc\_media\_t\*m;

libvlc\_time\_t length;int wait\_time=5000;/\*Load the VLC engine\*/inst= libvlc\_new (int(options.size()), options.data());//Configure any transcoding or streaming//options for the media source.

options.clear();//Create a new item//Method 1://m = libvlc\_media\_new\_location (inst, "file:///F:\\\\movie\\\\cuc\_ieschool.flv");//Screen Capture//m = libvlc\_media\_new\_location (inst, "screen://");//Method 2:m = libvlc\_media\_new\_path (inst, "D:\\\\warehouse\\\\data\\\\615\\\\haze.mp4");

/\*Create a media player playing environment\*/mp=libvlc\_media\_player\_new\_from\_media (m);/\*No need to keep the media now\*/libvlc\_media\_release (m);/\*\#\#comment the followint 2 lines , if you want the out frame display in screen\*/libvlc\_video\_set\_callbacks(mp,lock, unlock, display, 0);

libvlc\_video\_set\_format(mp,"RGBA", IMG\_WIDTH, IMG\_HEIGHT,IMG\_WIDTH\*4);//play the media\_player

libvlc\_media\_player\_play (mp);//wait until the tracks are created

\_sleep (wait\_time);

length=libvlc\_media\_player\_get\_length(mp);

IMG\_WIDTH=libvlc\_video\_get\_width(mp);

IMG\_HEIGHT=libvlc\_video\_get\_height(mp);

printf("Stream Duration: %ds\\n",length/1000);

printf("Resolution: %d x %d\\n",IMG\_WIDTH,IMG\_HEIGHT);//Let it play

\_sleep (length-wait\_time);//Stop playing

libvlc\_media\_player\_stop (mp);//Free the media\_player

libvlc\_media\_player\_release (mp);

libvlc\_release (inst);return 0;