codecapi.cpp

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

//----------------------------
// Symbian codec API
// 
//----------------------------
#include "rules.h"
#include "global.h"
#include "xvid.h"

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


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

struct S_decoder{
   xvid_dec_frame_t xvid_dec_frame;
   dword size_x;
   void *dec_handle;
};

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

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

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

   switch(fcc){
   case FCC('x', 'v', 'i', 'd'):
   case FCC('X', 'V', 'I', 'D'):
   case FCC('D', 'I', 'V', 'X'):
   case FCC('d', 'i', 'v', 'x'):
   case FCC('D', 'X', '5', '0'):
   case FCC('3', 'I', 'V', '2'):
   case FCC('3', 'i', 'v', '2'):
   case FCC('3', 'I', 'V', 'X'):
      break;
   default:
      return NULL;
   }
   S_decoder *dec = new(ELeave) S_decoder;
   dec->size_x = sx;

   xvid_dec_frame_t &xvid_dec_frame = dec->xvid_dec_frame;
   MemSet(&xvid_dec_frame, 0, sizeof(xvid_dec_frame));
   xvid_dec_frame.version = XVID_VERSION;
   //xvid_dec_frame.general = 0;
                           //convert into true-color, we'll perform convertion to dest format ourselves
   //xvid_dec_frame.output.csp = XVID_CSP_BGR;

   xvid_gbl_init_t xvid_gbl_init;
   MemSet(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
   xvid_gbl_init.version = XVID_VERSION;
   xvid_gbl_init.cpu_flags = 0;
   //xvid_gbl_init.debug = XVID_DEBUG_ERROR | XVID_DEBUG_STARTCODE | XVID_DEBUG_HEADER;
   xvid_global(NULL, 0, &xvid_gbl_init, NULL);

   xvid_dec_create_t xvid_dec_create;
   MemSet(&xvid_dec_create, 0, sizeof(xvid_dec_create));
   xvid_dec_create.version = XVID_VERSION;
   xvid_dec_create.width = 0;
   xvid_dec_create.height = 0;
#ifdef PROFILE
   xvid_dec_create.prof = &prof;
#endif
   xvid_dec_create.width = sx;
   xvid_dec_create.height = sy;

   int ret = xvid_decore(NULL, XVID_DEC_CREATE, &xvid_dec_create, NULL);
   if(ret){
      delete dec;
      return NULL;
   }
   dec->size_x = sx;
   dec->dec_handle = xvid_dec_create.handle;

   return dec;
}

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

void CloseCodec(void *handle){
   S_decoder *dec = (S_decoder*)handle;
   xvid_decore(dec->dec_handle, XVID_DEC_DESTROY, NULL, NULL);
   delete dec;
}

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

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

   S_decoder *dec = (S_decoder*)handle;

   dec->xvid_dec_frame.bitstream = buf;
   dec->xvid_dec_frame.length = sz_in;
   xvid_decore(dec->dec_handle, XVID_DEC_DECODE, &dec->xvid_dec_frame, NULL);

   const C_xvid_image *img = dec->xvid_dec_frame.img_out;
   if(!img)
      return 0;

   y = img->y;
   u = img->u;
   v = img->v;
   int mb_width = (dec->size_x + 15) / 16;
   pitch = 16 * mb_width + 2 * EDGE_SIZE;
   return 1;
}

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