timgfilteroutput.cpp

来自「从FFMPEG转换而来的H264解码程序,VC下编译..」· C++ 代码 · 共 120 行

/*
 * Copyright (c) 2005,2006 Milan Cutka
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "stdafx.h"
#include "TimgFilterOutput.h"
#include "Tconvert.h"
#include "TffPict.h"
#include "ToutputVideoSettings.h"
#include "IffdshowBase.h"
#include "Tlibavcodec.h"

TimgFilterOutput::TimgFilterOutput(IffdshowBase *Ideci,Tfilters *Iparent):TimgFilter(Ideci,Iparent),
 convert(NULL),
 libavcodec(NULL),avctx(NULL),dv(false),frame(NULL),dvpict(NULL),
 firsttime(true)
{
}
TimgFilterOutput::~TimgFilterOutput()
{
 if (convert) delete convert;
 if (dv) libavcodec->avcodec_close(avctx);
 if (frame) libavcodec->av_free(frame);
 if (avctx) libavcodec->av_free(avctx);
 if (libavcodec) libavcodec->Release();
 if (dvpict) delete dvpict;
}

HRESULT TimgFilterOutput::process(const TffPict &pict,int dstcsp,unsigned char *dst[4],int dstStride[4],LONG &dstSize,const ToutputVideoSettings *cfg)
{
 if (firsttime)
  {
   firsttime=false;
   if (cfg->dv && deci->getLibavcodec(&libavcodec)==S_OK)
    if (AVCodec *codec=libavcodec->avcodec_find_encoder(CODEC_ID_DVVIDEO))
     {
      avctx=libavcodec->avcodec_alloc_context();
      avctx->width=pict.rectFull.dx;
      avctx->height=pict.rectFull.dy;
      avctx->pix_fmt=PIX_FMT_YUV420P;
      if (libavcodec->avcodec_open(avctx,codec)>=0)
       {
        dv=true;
        frame=libavcodec->avcodec_alloc_frame();
        dvcsp=csp_lavc2ffdshow(avctx->pix_fmt);
        dvpict=new TffPict;
        dvpict->alloc(pict.rectFull.dx,pict.rectFull.dy,dvcsp,dvpictbuf);
       }
     }
  }

 if (!convert || convert->dx!=pict.rectFull.dx || convert->dy!=pict.rectFull.dy)
  {
   if (convert) delete convert;
   convert=new Tconvert(deci,pict.rectFull.dx,pict.rectFull.dy);
  }
 stride_t cspstride[4];unsigned char *cspdst[4];
 if (!dv)
  {
   const TcspInfo *outcspInfo=csp_getInfo(dstcsp);
   for (int i=0;i<4;i++)
    {
     cspstride[i]=dstStride[0]>>outcspInfo->shiftX[i];
     if (i==0)
      {
       cspdst[i]=dst[i];
      }
     else
      {
       cspdst[i]=cspdst[i-1]+cspstride[i-1]*(pict.rectFull.dy>>outcspInfo->shiftY[i-1]);
      }
    }
  }
 const TffPict *dvp;
 if (!dv || pict.csp!=dvcsp)
  {
   int cspret=convert->convert(pict,((dv?dvcsp:dstcsp)^(cfg->flip?FF_CSP_FLAGS_VFLIP:0))|((pict.fieldtype&FIELD_TYPE::MASK_INT)?FF_CSP_FLAGS_INTERLACED:0),dv?dvpict->data:cspdst,dv?dvpict->stride:cspstride);
   if (!dv) return cspret?S_OK:E_FAIL;
   dvp=dvpict;
  }
 else
  dvp=&pict;
 for (int i=0;i<4;i++)
  {
   frame->data[i]=dvp->data[i];
   frame->linesize[i]=(int)dvp->stride[i];
  }
 int ret=libavcodec->avcodec_encode_video(avctx,dst[0],dstSize,frame);
 if (ret<0)
  return E_FAIL;
 else
  {
   dstSize=ret;
   return S_FALSE;
  }
}

HRESULT TimgFilterOutputConvert::process(TfilterQueue::iterator it,TffPict &pict,const TfilterSettingsVideo *cfg0)
{
 const ToutputVideoConvertSettings *cfg=(const ToutputVideoConvertSettings*)cfg0;
 init(pict,true,false);
 const unsigned char *src[4];
 getCur(cfg->csp,pict,true,src);
 return parent->deliverSample(++it,pict);
}