yuv420P数据对AVFrame的赋值

来源：互联网发布：熟悉linux内核编辑：程序博客网时间：2024/05/23 00:06

AVFrame *pict = new AVFrame；

   FILE * fyuv = fopen("G:\\352x288.yuv","rb");
  int nfilelen = ( width * height * 3 )/2;
  BYTE * pbuf = new BYTE[nfilelen];
  fread(pbuf,1,nfilelen,fyuv);
  fclose(fyuv);

int size = width * height;

  pict->data[0] = pbuf;
  pict->data[1] = pict->data[0] + size;
  pict->data[2] = pict->data[1] + size / 4;
  pict->linesize[0] = width;
  pict->linesize[1] = width / 2;
  pict->linesize[2] = width / 2;

AVFrame * alloc_picture(enum PixelFormat pix_fmt, int width, int height)
{
AVFrame *picture;
uint8_t *picture_buf;
int size;

picture = avcodec_alloc_frame();                     if (!picture){ return NULL;}
size    = avpicture_get_size(pix_fmt, width, height);
picture_buf = (uint8_t *)av_malloc(size);               if (!picture_buf) {av_free(picture); return NULL;}

avpicture_fill((AVPicture *)picture, picture_buf, pix_fmt, width, height);

return picture;
}