codecapi.cpp

鼎鼎有名的手机mpeg4播放器smart movie－智能影院 解码内核

/*****************************************************************************
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 ****************************************************************************/

#ifdef __SYMBIAN32__
#include <e32std.h>
#include <e32base.h>
GLDEF_C TInt E32Dll(TDllReason){ return KErrNone; }
#else
#endif

#define SUPPORTED_CODEC_VERSION 310

#include "Rules.h"
#include "Util.h"
#include "VideoCodec.h"

#if defined LINUX || defined __SYMBIAN32__
extern"C"{
#endif

//----------------------------
// communication functions

void *InitCodec(dword sx, dword sy, dword fcc, dword codec_version, void *profiler);
void CloseCodec(void *handle);
int DecodeFrame(void *handle, const void *buf, dword sz_in, const byte *&y, const byte *&u, const byte *&v, dword &pitch, bool dropping);
dword Version();

#if defined LINUX || defined __SYMBIAN32__
}
#endif

//----------------------------

dword Version(){
   return SUPPORTED_CODEC_VERSION;
}

//----------------------------

#define FCC(a, b, c, d) dword((d<<24) | (c<<16) | (b<<8) | a)

//----------------------------

void *InitCodec(dword sx, dword sy, dword fcc, dword codec_version, void *profiler){

   if(codec_version<SUPPORTED_CODEC_VERSION || codec_version>500)
      return NULL;
   {
                              //make the fcc lower-case
      char *cp = (char*)&fcc;
      for(int i=0; i<4; i++){
         char &c = cp[i];
         if(c>='A' && c<='Z')
            c += 'a' - 'A';
      }
   }

   switch(fcc){
   case FCC('x', 'v', 'i', 'd'):
   case FCC('d', 'i', 'v', 'x'):
   case FCC('d', 'x', '5', '0'):
   case FCC('3', 'i', 'v', '2'):
   case FCC('3', 'i', 'v', 'x'):
      break;
   default:
      return NULL;
   }
   C_mp4_decode *dec = CreateMp4Decode(sx, sy, profiler);
   if(!dec){
#ifdef __PALMOS__
      void Info(const char*, dword=0);
      Info("Core MP4: not enough memory for initialization");
#endif
      return NULL;
   }
   return dec;
}

//----------------------------

void CloseCodec(void *handle){
   C_mp4_decode *dec = (C_mp4_decode*)handle;
   delete dec;
}

//----------------------------

int DecodeFrame(void *handle, const void *buf, dword sz_in, const byte *&y, const byte *&u, const byte *&v, dword &pitch, bool dropping){

   C_mp4_decode *dec = (C_mp4_decode*)handle;
   S_yuv_image out;
   if(!dec->Process((byte*)buf, sz_in, (int)dropping, out))
      return 0;
   y = out.y;
   u = out.u;
   v = out.v;
   pitch = out.pitch;
   return 1;
}

//----------------------------

#ifdef __PALMOS__

extern"C"
void *DllMain(dword ord){

   switch(ord){
   case 1: return (void*)&InitCodec;
   case 2: return (void*)&CloseCodec;
   case 3: return (void*)&DecodeFrame;
   }
   return NULL;
}

#endif

//----------------------------