store.c

MPEG2视频编解码算法方面的源代码(包括编码和解码)

/* store.c, picture output routines                                         */

/* Copyright (C) 1996, MPEG Software Simulation Group. All Rights Reserved. */

/*
 * Disclaimer of Warranty
 *
 * These software programs are available to the user without any license fee or
 * royalty on an "as is" basis.  The MPEG Software Simulation Group disclaims
 * any and all warranties, whether express, implied, or statuary, including any
 * implied warranties or merchantability or of fitness for a particular
 * purpose.  In no event shall the copyright-holder 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 MPEG Software Simulation Group does not represent or warrant that the
 * programs furnished hereunder are free of infringement of any third-party
 * patents.
 *
 * Commercial implementations of MPEG-1 and MPEG-2 video, including shareware,
 * are subject to royalty fees to patent holders.  Many of these patents are
 * general enough such that they are unavoidable regardless of implementation
 * design.
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

#include "config.h"
#include "global.h"

/* private prototypes */
static void store_one _ANSI_ARGS_((char *outname, unsigned char *src[],
  int offset, int incr, int height));
static void store_yuv _ANSI_ARGS_((char *outname, unsigned char *src[],
  int offset, int incr, int height));
static void store_sif _ANSI_ARGS_((char *outname, unsigned char *src[],
  int offset, int incr, int height));
static void store_ppm_tga _ANSI_ARGS_((char *outname, unsigned char *src[],
  int offset, int incr, int height, int tgaflag));
static void store_yuv1 _ANSI_ARGS_((char *name, unsigned char *src,
  int offset, int incr, int width, int height));
static void putbyte _ANSI_ARGS_((int c));
static void putword _ANSI_ARGS_((int w));
static void conv422to444 _ANSI_ARGS_((unsigned char *src, unsigned char *dst));
static void conv420to422 _ANSI_ARGS_((unsigned char *src, unsigned char *dst));

#define OBFRSIZE 4096
static unsigned char obfr[OBFRSIZE];
static unsigned char *optr;
static int outfile;

/*
 * store a picture as either one frame or two fields
 */
void Write_Frame(src,frame)
unsigned char *src[];
int frame;
{
  char outname[FILENAME_LENGTH];

  if (progressive_sequence || progressive_frame || Frame_Store_Flag)
  {
    /* progressive */
    sprintf(outname,Output_Picture_Filename,frame,'f');
    store_one(outname,src,0,Coded_Picture_Width,vertical_size);
  }
  else
  {
    /* interlaced */
    sprintf(outname,Output_Picture_Filename,frame,'a');
    store_one(outname,src,0,Coded_Picture_Width<<1,vertical_size>>1);

    sprintf(outname,Output_Picture_Filename,frame,'b');
    store_one(outname,src,
      Coded_Picture_Width,Coded_Picture_Width<<1,vertical_size>>1);
  }
}

/*
 * store one frame or one field
 */
static void store_one(outname,src,offset,incr,height)
char *outname;
unsigned char *src[];
int offset, incr, height;
{
  switch (Output_Type)
  {
  case T_YUV:
    store_yuv(outname,src,offset,incr,height);
    break;
  case T_SIF:
    store_sif(outname,src,offset,incr,height);
    break;
  case T_TGA:
    store_ppm_tga(outname,src,offset,incr,height,1);
    break;
  case T_PPM:
    store_ppm_tga(outname,src,offset,incr,height,0);
    break;
#ifdef DISPLAY
  case T_X11:
    dither(src);
    break;
#endif
  default:
    break;
  }
}

/* separate headerless files for y, u and v */
static void store_yuv(outname,src,offset,incr,height)
char *outname;
unsigned char *src[];
int offset,incr,height;
{
  int hsize;
  char tmpname[FILENAME_LENGTH];

  hsize = horizontal_size;

  sprintf(tmpname,"%s.Y",outname);
  store_yuv1(tmpname,src[0],offset,incr,hsize,height);

  if (chroma_format!=CHROMA444)
  {
    offset>>=1; incr>>=1; hsize>>=1;
  }

  if (chroma_format==CHROMA420)
  {
    height>>=1;
  }

  sprintf(tmpname,"%s.U",outname);
  store_yuv1(tmpname,src[1],offset,incr,hsize,height);

  sprintf(tmpname,"%s.V",outname);
  store_yuv1(tmpname,src[2],offset,incr,hsize,height);
}

/* auxiliary routine */
static void store_yuv1(name,src,offset,incr,width,height)
char *name;
unsigned char *src;
int offset,incr,width,height;
{
  int i, j;
  unsigned char *p;

  if (!Quiet_Flag)
    fprintf(stderr,"saving %s\n",name);

  if ((outfile = open(name,O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666))==-1)
  {
    sprintf(Error_Text,"Couldn't create %s\n",name);
    Error(Error_Text);
  }

  optr=obfr;

  for (i=0; i<height; i++)
  {
    p = src + offset + incr*i;
    for (j=0; j<width; j++)
      putbyte(*p++);
  }

  if (optr!=obfr)
    write(outfile,obfr,optr-obfr);

  close(outfile);
}

/*
 * store as headerless file in U,Y,V,Y format
 */
static void store_sif (outname,src,offset,incr,height)
char *outname;
unsigned char *src[];
int offset, incr, height;
{
  int i,j;
  unsigned char *py, *pu, *pv;
  static unsigned char *u422, *v422;

  if (chroma_format==CHROMA444)
    Error("4:4:4 not supported for SIF format");

  if (chroma_format==CHROMA422)
  {
    u422 = src[1];
    v422 = src[2];
  }
  else
  {
    if (!u422)
    {
      if (!(u422 = (unsigned char *)malloc((Coded_Picture_Width>>1)
                                           *Coded_Picture_Height)))
        Error("malloc failed");
      if (!(v422 = (unsigned char *)malloc((Coded_Picture_Width>>1)
                                           *Coded_Picture_Height)))
        Error("malloc failed");
    }
  
    conv420to422(src[1],u422);
    conv420to422(src[2],v422);
  }

  strcat(outname,".SIF");

  if (!Quiet_Flag)
    fprintf(stderr,"saving %s\n",outname);

  if ((outfile = open(outname,O_CREAT|O_TRUNC|O_WRONLY|O_BINARY,0666))==-1)
  {
    sprintf(Error_Text,"Couldn't create %s\n",outname);
    Error(Error_Text);
  }

  optr = obfr;

  for (i=0; i<height; i++)
  {
    py = src[0] + offset + incr*i;
    pu = u422 + (offset>>1) + (incr>>1)*i;
    pv = v422 + (offset>>1) + (incr>>1)*i;

    for (j=0; j<horizontal_size; j+=2)
    {
      putbyte(*pu++);
      putbyte(*py++);
      putbyte(*pv++);
      putbyte(*py++);
    }
  }

  if (optr!=obfr)
    write(outfile,obfr,optr-obfr);

  close(outfile);
}

/*
 * store as PPM (PBMPLUS) or uncompressed Truevision TGA ('Targa') file
 */
static void store_ppm_tga(outname,src,offset,incr,height,tgaflag)
char *outname;
unsigned char *src[];
int offset, incr, height;
int tgaflag;
{
  int i, j;
  int y, u, v, r, g, b;
  int crv, cbu, cgu, cgv;
  unsigned char *py, *pu, *pv;
  static unsigned char tga24[14] = {0,0,2,0,0,0,0, 0,0,0,0,0,24,32};
  char header[FILENAME_LENGTH];
  static unsigned char *u422, *v422, *u444, *v444;

  if (chroma_format==CHROMA444)
  {
    u444 = src[1];
    v444 = src[2];
  }
  else
  {
    if (!u444)
    {
      if (chroma_format==CHROMA420)
      {
        if (!(u422 = (unsigned char *)malloc((Coded_Picture_Width>>1)
                                             *Coded_Picture_Height)))
          Error("malloc failed");
        if (!(v422 = (unsigned char *)malloc((Coded_Picture_Width>>1)
                                             *Coded_Picture_Height)))
          Error("malloc failed");
      }

      if (!(u444 = (unsigned char *)malloc(Coded_Picture_Width
                                           *Coded_Picture_Height)))
        Error("malloc failed");