filehandle.c

包含了从MPEG4的视频解码到H.264的视频编码部分的源代码

/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2001, International Telecommunications Union, Geneva
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the user without any
* license fee or royalty on an "as is" basis. The ITU disclaims
* any and all warranties, whether express, implied, or
* statutory, including any implied warranties of merchantability
* or of fitness for a particular purpose.  In no event shall the
* contributor or the ITU be liable for any incidental, punitive, or
* consequential damages of any kind whatsoever arising from the
* use of these programs.
*
* This disclaimer of warranty extends to the user of these programs
* and user's customers, employees, agents, transferees, successors,
* and assigns.
*
* The ITU does not represent or warrant that the programs furnished
* hereunder are free of infringement of any third-party patents.
* Commercial implementations of ITU-T Recommendations, including
* shareware, may be subject to royalty fees to patent holders.
* Information regarding the ITU-T patent policy is available from
* the ITU Web site at http://www.itu.int.
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE ITU-T PATENT POLICY.
************************************************************************
*/

/*!
 **************************************************************************************
 * \file
 *    filehandle.c
 * \brief
 *    Start and terminate sequences
 * \author
 *    Main contributors (see contributors.h for copyright, address and affiliation details)
 *      - Thomas Stockhammer            <[e-mail]>
 *      - Detlev Marpe                  <[e-mail]>
 ***************************************************************************************
 */

#include "contributors.h"

#include <string.h>
#include <math.h>
#include <time.h>
#include <sys/timeb.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>

#include "global.h"
#include "header.h"
#include "rtp.h"
#include "nalu.h"
#include "annexb.h"
#include "parset.h"


/*!
 ************************************************************************
 * \brief
 *    Error handling procedure. Print error message to stderr and exit
 *    with supplied code.
 * \param text
 *    Error message
 * \param code
 *    Exit code
 ************************************************************************
 */
void error(char *text, int code)
{
  fprintf(stderr, "%s\n", text);
  exit(code);
}

/*!
 ************************************************************************
 * \brief
 *    This function opens the output files and generates the
 *    appropriate sequence header
 ************************************************************************
 */
int start_sequence()
{
  int len=0;
  NALU_t *nalu;

  switch(input->of_mode)
  {
    case PAR_OF_ANNEXB:
      OpenAnnexbFile (input->outfile);
      WriteNALU = WriteAnnexbNALU;
      break;
    case PAR_OF_RTP:
      OpenRTPFile (input->outfile);
      WriteNALU = WriteRTPNALU;
      break;
    default:
      snprintf(errortext, ET_SIZE, "Output File Mode %d not supported", input->of_mode);
      error(errortext,1);
      return 1;
  }

  //! As a sequence header, here we write the both sequence and picture
  //! parameter sets.  As soon as IDR is implemented, this should go to the
  //! IDR part, as both parsets have to be transmitted as part of an IDR.
  //! An alterbative may be to consider this function the IDR start function.
  
  nalu = NULL;
  nalu = GenerateSeq_parameter_set_NALU ();
  len += WriteNALU (nalu);
  FreeNALU (nalu);
  nalu = NULL;
  nalu = GeneratePic_parameter_set_NALU ();
  len += WriteNALU (nalu);
  FreeNALU (nalu);
  stat->bit_ctr_parametersets = len;
  return 0;
}

/*!
 ************************************************************************
 * \brief
 *     This function terminates the sequence and closes the
 *     output files
 ************************************************************************
 */
int terminate_sequence()
{
//  Bitstream *currStream;

  // Mainly flushing of everything
  // Add termination symbol, etc.

  switch(input->of_mode)
  {
    case PAR_OF_ANNEXB:
      CloseAnnexbFile();
      break;
    case PAR_OF_RTP:
      CloseRTPFile();
      return 0;
    default:
      snprintf(errortext, ET_SIZE, "Output File Mode %d not supported", input->of_mode);
      error(errortext,1);
      return 1;
  }
  return 1;   // make lint happy
}