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readpic.c
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/* readpic.c, read source pictures */
/* 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 "global.h"
#ifndef USE_CLIPTABLE
#define USE_CLIPTABLE 0
#endif
/* private prototypes */
static void read_y_u_v(simpeg_encode_context * context, char *fname, unsigned char *frame[]);
static void read_yuv(simpeg_encode_context * context,char *fname, unsigned char *frame[]);
static void read_ppm(simpeg_encode_context * context,char *fname, unsigned char *frame[]);
static void border_extend(unsigned char *frame, int w1, int h1,
int w2, int h2);
static void conv444to422(simpeg_encode_context * context,unsigned char *src, unsigned char *dst);
static void conv422to420(simpeg_encode_context * context,unsigned char *src, unsigned char *dst);
static void SimpegWrite_read_buffer(simpeg_encode_context * context, unsigned char *buffer, unsigned char *frame[]);
/* pbm_getc() and pbm_getint() are essentially taken from
* PBMPLUS (C) Jef Poskanzer
* but without error/EOF checking
*/
static char pbm_getc(FILE *file)
{
char ch;
ch = getc(file);
if (ch=='#')
{
do
{
ch = getc(file);
}
while (ch!='\n' && ch!='\r');
}
return ch;
}
static int pbm_getint(FILE *file)
{
char ch;
int i;
do
{
ch = pbm_getc(file);
}
while (ch==' ' || ch=='\t' || ch=='\n' || ch=='\r');
i = 0;
do
{
i = i*10 + ch-'0';
ch = pbm_getc(file);
}
while (ch>='0' && ch<='9');
return i;
}
void
simpeg_encode_readframe(simpeg_encode_context * context, char *fname, unsigned char **frame)
{
switch (context->inputtype)
{
case T_Y_U_V:
read_y_u_v(context,fname,frame);
break;
case T_YUV:
read_yuv(context,fname,frame);
break;
case T_PPM:
read_ppm(context,fname,frame);
break;
case T_RGB_BUFFER:
/* fname is bitmap buffer, not filename.
See putseq.c SimpegWrite_putseq_encode_bitmap().
*/
SimpegWrite_read_buffer(context,(unsigned char *)fname, frame);
break;
default:
break;
}
}
static void
read_y_u_v(simpeg_encode_context * context, char *fname, unsigned char **frame)
{
int i;
int chrom_hsize, chrom_vsize;
char name[128];
FILE *fd;
int width, height, chroma_format, vertical_size, horizontal_size;
width = context->width;
height = context->height;
chroma_format = context->chroma_format;
vertical_size = context->vertical_size;
horizontal_size = context->horizontal_size;
chrom_hsize = (chroma_format==CHROMA444) ? horizontal_size : horizontal_size>>1;
chrom_vsize = (chroma_format!=CHROMA420) ? vertical_size : vertical_size>>1;
sprintf(name,"%s.Y",fname);
if (!(fd = fopen(name,"rb")))
{
sprintf(context->errortext,"Couldn't open %s\n",name);
simpeg_encode_error(context,context->errortext);
}
for (i=0; i<vertical_size; i++)
fread(frame[0]+i*width,1,horizontal_size,fd);
fclose(fd);
border_extend(frame[0],horizontal_size,vertical_size,width,height);
sprintf(name,"%s.U",fname);
if (!(fd = fopen(name,"rb")))
{
sprintf(context->errortext,"Couldn't open %s\n",name);
simpeg_encode_error(context,context->errortext);
}
for (i=0; i<chrom_vsize; i++)
fread(frame[1]+i*context->chrom_width,1,chrom_hsize,fd);
fclose(fd);
border_extend(frame[1],chrom_hsize,chrom_vsize,context->chrom_width,context->chrom_height);
sprintf(name,"%s.V",fname);
if (!(fd = fopen(name,"rb")))
{
sprintf(context->errortext,"Couldn't open %s\n",name);
simpeg_encode_error(context,context->errortext);
}
for (i=0; i<chrom_vsize; i++)
fread(frame[2]+i*context->chrom_width,1,chrom_hsize,fd);
fclose(fd);
border_extend(frame[2],chrom_hsize,chrom_vsize,context->chrom_width,context->chrom_height);
}
static void read_yuv(simpeg_encode_context * context,char *fname, unsigned char **frame)
{
int i;
int chrom_hsize, chrom_vsize;
char name[128];
FILE *fd;
int width, height, chroma_format, vertical_size, horizontal_size;
width = context->width;
height = context->height;
chroma_format = context->chroma_format;
vertical_size = context->vertical_size;
horizontal_size = context->horizontal_size;
chrom_hsize = (chroma_format==CHROMA444) ? horizontal_size
: horizontal_size>>1;
chrom_vsize = (chroma_format!=CHROMA420) ? vertical_size
: vertical_size>>1;
sprintf(name,"%s.yuv",fname);
if (!(fd = fopen(name,"rb")))
{
sprintf(context->errortext,"Couldn't open %s\n",name);
simpeg_encode_error(context,context->errortext);
}
/* Y */
for (i=0; i<vertical_size; i++)
fread(frame[0]+i*width,1,horizontal_size,fd);
border_extend(frame[0],horizontal_size,vertical_size,width,height);
/* Cb */
for (i=0; i<chrom_vsize; i++)
fread(frame[1]+i*context->chrom_width,1,chrom_hsize,fd);
border_extend(frame[1],chrom_hsize,chrom_vsize,context->chrom_width,context->chrom_height);
/* Cr */
for (i=0; i<chrom_vsize; i++)
fread(frame[2]+i*context->chrom_width,1,chrom_hsize,fd);
border_extend(frame[2],chrom_hsize,chrom_vsize,context->chrom_width,context->chrom_height);
fclose(fd);
}
static void read_ppm(simpeg_encode_context * context,char *fname, unsigned char **frame)
{
int i, j;
int r, g, b;
double y, u, v;
double cr, cg, cb, cu, cv;
char name[128];
FILE *fd;
unsigned char *yp, *up, *vp;
static double coef[7][3] = {
{0.2125,0.7154,0.0721}, /* ITU-R Rec. 709 (1990) */
{0.299, 0.587, 0.114}, /* unspecified */
{0.299, 0.587, 0.114}, /* reserved */
{0.30, 0.59, 0.11}, /* FCC */
{0.299, 0.587, 0.114}, /* ITU-R Rec. 624-4 System B, G */
{0.299, 0.587, 0.114}, /* SMPTE 170M */
{0.212, 0.701, 0.087}}; /* SMPTE 240M (1987) */
int width, height, chroma_format, vertical_size, horizontal_size;
width = context->width;
height = context->height;
chroma_format = context->chroma_format;
vertical_size = context->vertical_size;
horizontal_size = context->horizontal_size;
i = context->matrix_coefficients;
if (i>8)
i = 3;
cr = coef[i-1][0];
cg = coef[i-1][1];
cb = coef[i-1][2];
cu = 0.5/(1.0-cb);
cv = 0.5/(1.0-cr);
if (chroma_format==CHROMA444)
{
context->read_ppm_u444 = frame[1];
context->read_ppm_v444 = frame[2];
}
else
{
if (!context->read_ppm_u444)
{
if (!(context->read_ppm_u444 = (unsigned char *)malloc(width*height)))
simpeg_encode_error(context,"malloc failed");
if (!(context->read_ppm_v444 = (unsigned char *)malloc(width*height)))
simpeg_encode_error(context,"malloc failed");
if (chroma_format==CHROMA420)
{
if (!(context->read_ppm_u422 = (unsigned char *)malloc((width>>1)*height)))
simpeg_encode_error(context,"malloc failed");
if (!(context->read_ppm_v422 = (unsigned char *)malloc((width>>1)*height)))
simpeg_encode_error(context,"malloc failed");
}
}
}
sprintf(name,"%s.ppm",fname);
if (!(fd = fopen(name,"rb")))
{
sprintf(context->errortext,"Couldn't open %s\n",name);
simpeg_encode_error(context,context->errortext);
}
/* skip header */
getc(fd); getc(fd); /* magic number (P6) */
pbm_getint(fd); pbm_getint(fd); pbm_getint(fd); /* width height maxcolors */
for (i=0; i<vertical_size; i++)
{
yp = frame[0] + i*width;
up = context->read_ppm_u444 + i*width;
vp = context->read_ppm_v444 + i*width;
for (j=0; j<horizontal_size; j++)
{
r=getc(fd); g=getc(fd); b=getc(fd);
/* convert to YUV */
y = cr*r + cg*g + cb*b;
u = cu*(b-y);
v = cv*(r-y);
yp[j] = (219.0/256.0)*y + 16.5; /* nominal range: 16..235 */
up[j] = (224.0/256.0)*u + 128.5; /* 16..240 */
vp[j] = (224.0/256.0)*v + 128.5; /* 16..240 */
}
}
fclose(fd);
border_extend(frame[0],horizontal_size,vertical_size,width,height);
border_extend(context->read_ppm_u444,horizontal_size,vertical_size,width,height);
border_extend(context->read_ppm_v444,horizontal_size,vertical_size,width,height);
if (chroma_format==CHROMA422)
{
conv444to422(context,context->read_ppm_u444,frame[1]);
conv444to422(context,context->read_ppm_v444,frame[2]);
}
if (chroma_format==CHROMA420)
{
conv444to422(context,context->read_ppm_u444,context->read_ppm_u422);
conv444to422(context,context->read_ppm_v444,context->read_ppm_v422);
conv422to420(context,context->read_ppm_u422,frame[1]);
conv422to420(context,context->read_ppm_v422,frame[2]);
}
}
static void SimpegWrite_read_buffer(simpeg_encode_context * context, unsigned char *buffer, unsigned char *frame[])
{
int i, j;
int r, g, b;
double y, u, v;
double cr, cg, cb, cu, cv;
int heightsum, totsum;
int iy, iu, iv;
unsigned char *yp, *up, *vp;
static double coef[7][3] = {
{0.2125,0.7154,0.0721}, /* ITU-R Rec. 709 (1990) */
{0.299, 0.587, 0.114}, /* unspecified */
{0.299, 0.587, 0.114}, /* reserved */
{0.30, 0.59, 0.11}, /* FCC */
{0.299, 0.587, 0.114}, /* ITU-R Rec. 624-4 System B, G */
{0.299, 0.587, 0.114}, /* SMPTE 170M */
{0.212, 0.701, 0.087}}; /* SMPTE 240M (1987) */
int width, height, chroma_format, vertical_size, horizontal_size;
width = context->width;
height = context->height;
chroma_format = context->chroma_format;
vertical_size = context->vertical_size;
horizontal_size = context->horizontal_size;
i = context->matrix_coefficients;
if (i>8)
i = 3;
cr = coef[i-1][0];
cg = coef[i-1][1];
cb = coef[i-1][2];
cu = 0.5/(1.0-cb);
cv = 0.5/(1.0-cr);
if (chroma_format==CHROMA444)
{
context->read_ppm_u444 = frame[1];
context->read_ppm_v444 = frame[2];
}
else
{
if (!context->read_ppm_u444)
{
if (!(context->read_ppm_u444 = (unsigned char *)malloc(width*height)))
simpeg_encode_error(context,"malloc failed");
if (!(context->read_ppm_v444 = (unsigned char *)malloc(width*height)))
simpeg_encode_error(context,"malloc failed");
if (chroma_format==CHROMA420)
{
if (!(context->read_ppm_u422 = (unsigned char *)malloc((width>>1)*height)))
simpeg_encode_error(context,"malloc failed");
if (!(context->read_ppm_v422 = (unsigned char *)malloc((width>>1)*height)))
simpeg_encode_error(context,"malloc failed");
}
}
}
totsum = vertical_size * horizontal_size *3;
for (i=0; i<vertical_size; i++)
{
yp = frame[0] + i*width;
up = context->read_ppm_u444 + i*width;
vp = context->read_ppm_v444 + i*width;
heightsum = totsum-(i+1)*horizontal_size*3;
for (j=0; j<horizontal_size; j++)
{
r=buffer[heightsum + j*3 + 0];
g=buffer[heightsum + j*3 + 1];
b=buffer[heightsum + j*3 + 2];
/* convert to YUV */
y = cr*r + cg*g + cb*b;
u = cu*(b-y);
v = cv*(r-y);
iy = (219.0/256.0)*y + 16.5; /* nominal range: 16..235 */
iu = (224.0/256.0)*u + 128.5; /* 16..240 */
iv = (224.0/256.0)*v + 128.5; /* 16..240 */
#if USE_CLIPTABLE
yp[j] = context->clp[iy];
up[j] = context->clp[iu];
vp[j] = context->clp[iv];
#else
yp[j] = iy < 0 ? 0 : (iy > 255 ? 255 : iy);
up[j] = iu < 0 ? 0 : (iu > 255 ? 255 : iu);
vp[j] = iv < 0 ? 0 : (iv > 255 ? 255 : iv);
#endif
}
}
border_extend(frame[0],horizontal_size,vertical_size,width,height);
border_extend(context->read_ppm_u444,horizontal_size,vertical_size,width,height);
border_extend(context->read_ppm_v444,horizontal_size,vertical_size,width,height);
if (chroma_format==CHROMA422)
{
conv444to422(context,context->read_ppm_u444,frame[1]);
conv444to422(context,context->read_ppm_v444,frame[2]);
}
if (chroma_format==CHROMA420)
{
conv444to422(context,context->read_ppm_u444,context->read_ppm_u422);
conv444to422(context,context->read_ppm_v444,context->read_ppm_v422);
conv422to420(context,context->read_ppm_u422,frame[1]);
conv422to420(context,context->read_ppm_v422,frame[2]);
}
}
static void border_extend(unsigned char *frame, int w1, int h1, int w2, int h2)
{
int i, j;
unsigned char *fp;
/* horizontal pixel replication (right border) */
for (j=0; j<h1; j++)
{
fp = frame + j*w2;
for (i=w1; i<w2; i++)
fp[i] = fp[i-1];
}
/* vertical pixel replication (bottom border) */
for (j=h1; j<h2; j++)
{
fp = frame + j*w2;
for (i=0; i<w2; i++)
fp[i] = fp[i-w2];
}
}
/* horizontal filter and 2:1 subsampling */
static void
conv444to422(simpeg_encode_context * context, unsigned char *src, unsigned char *dst)
{
int i, j, im5, im4, im3, im2, im1, ip1, ip2, ip3, ip4, ip5, ip6;
int width, height;
int idx;
width = context->width;
height = context->height;
if (context->mpeg1)
{
for (j=0; j<height; j++)
{
for (i=0; i<width; i+=2)
{
im5 = (i<5) ? 0 : i-5;
im4 = (i<4) ? 0 : i-4;
im3 = (i<3) ? 0 : i-3;
im2 = (i<2) ? 0 : i-2;
im1 = (i<1) ? 0 : i-1;
ip1 = (i<width-1) ? i+1 : width-1;
ip2 = (i<width-2) ? i+2 : width-1;
ip3 = (i<width-3) ? i+3 : width-1;
ip4 = (i<width-4) ? i+4 : width-1;
ip5 = (i<width-5) ? i+5 : width-1;
ip6 = (i<width-5) ? i+6 : width-1;
/* FIR filter with 0.5 sample interval phase shift */
idx = (int)(228*(src[i]+src[ip1])
+70*(src[im1]+src[ip2])
-37*(src[im2]+src[ip3])
-21*(src[im3]+src[ip4])
+11*(src[im4]+src[ip5])
+ 5*(src[im5]+src[ip6])+256)>>9;
#if USE_CLIPTABLE
dst[i>>1] = context->clp[idx];
#else
dst[i>>1] = idx < 0 ? 0 : (idx > 255 ? 255 : idx);
#endif
}
src+= width;
dst+= width>>1;
}
}
else
{
/* MPEG-2 */
for (j=0; j<height; j++)
{
for (i=0; i<width; i+=2)
{
im5 = (i<5) ? 0 : i-5;
im3 = (i<3) ? 0 : i-3;
im1 = (i<1) ? 0 : i-1;
ip1 = (i<width-1) ? i+1 : width-1;
ip3 = (i<width-3) ? i+3 : width-1;
ip5 = (i<width-5) ? i+5 : width-1;
idx = (int)(22*(src[im5]+src[ip5])-52*(src[im3]+src[ip3])
+159*(src[im1]+src[ip1])+256*src[i]+256)>>9;
/* FIR filter coefficients (*512): 22 0 -52 0 159 256 159 0 -52 0 22 */
#if USE_CLIPTABLE
dst[i>>1] = context->clp[idx];
#else
dst[i>>1] = idx < 0 ? 0 : (idx > 255 ? 255 : idx);
#endif
}
src+= width;
dst+= width>>1;
}
}
}
/* vertical filter and 2:1 subsampling */
static void
conv422to420(simpeg_encode_context * context,unsigned char *src, unsigned char *dst)
{
int w, i, j, jm6, jm5, jm4, jm3, jm2, jm1;
int jp1, jp2, jp3, jp4, jp5, jp6;
int idx;
int width, height;
width = context->width;
height = context->height;
w = width>>1;
if (context->prog_frame)
{
/* intra frame */
for (i=0; i<w; i++)
{
for (j=0; j<height; j+=2)
{
jm5 = (j<5) ? 0 : j-5;
jm4 = (j<4) ? 0 : j-4;
jm3 = (j<3) ? 0 : j-3;
jm2 = (j<2) ? 0 : j-2;
jm1 = (j<1) ? 0 : j-1;
jp1 = (j<height-1) ? j+1 : height-1;
jp2 = (j<height-2) ? j+2 : height-1;
jp3 = (j<height-3) ? j+3 : height-1;
jp4 = (j<height-4) ? j+4 : height-1;
jp5 = (j<height-5) ? j+5 : height-1;
jp6 = (j<height-5) ? j+6 : height-1;
idx = (int)(228*(src[w*j]+src[w*jp1])
+70*(src[w*jm1]+src[w*jp2])
-37*(src[w*jm2]+src[w*jp3])
-21*(src[w*jm3]+src[w*jp4])
+11*(src[w*jm4]+src[w*jp5])
+ 5*(src[w*jm5]+src[w*jp6])+256)>>9;
#if USE_CLIPTABLE
/* FIR filter with 0.5 sample interval phase shift */
dst[w*(j>>1)] = context->clp[idx];
#else
dst[w*(j>>1)] = idx < 0 ? 0 : (idx > 255 ? 255 : idx);
#endif
}
src++;
dst++;
}
}
else
{
/* intra field */
for (i=0; i<w; i++)
{
for (j=0; j<height; j+=4)
{
/* top field */
jm5 = (j<10) ? 0 : j-10;
jm4 = (j<8) ? 0 : j-8;
jm3 = (j<6) ? 0 : j-6;
jm2 = (j<4) ? 0 : j-4;
jm1 = (j<2) ? 0 : j-2;
jp1 = (j<height-2) ? j+2 : height-2;
jp2 = (j<height-4) ? j+4 : height-2;
jp3 = (j<height-6) ? j+6 : height-2;
jp4 = (j<height-8) ? j+8 : height-2;
jp5 = (j<height-10) ? j+10 : height-2;
jp6 = (j<height-12) ? j+12 : height-2;
/* FIR filter with 0.25 sample interval phase shift */
idx = (int)(8*src[w*jm5]
+5*src[w*jm4]
-30*src[w*jm3]
-18*src[w*jm2]
+113*src[w*jm1]
+242*src[w*j]
+192*src[w*jp1]
+35*src[w*jp2]
-38*src[w*jp3]
-10*src[w*jp4]
+11*src[w*jp5]
+2*src[w*jp6]+256)>>9;
#if USE_CLIPTABLE
dst[w*(j>>1)] = context->clp[idx];
#else
dst[w*(j>>1)] = idx < 0 ? 0 : (idx > 255 ? 255 : idx);
#endif
/* bottom field */
jm6 = (j<9) ? 1 : j-9;
jm5 = (j<7) ? 1 : j-7;
jm4 = (j<5) ? 1 : j-5;
jm3 = (j<3) ? 1 : j-3;
jm2 = (j<1) ? 1 : j-1;
jm1 = (j<height-1) ? j+1 : height-1;
jp1 = (j<height-3) ? j+3 : height-1;
jp2 = (j<height-5) ? j+5 : height-1;
jp3 = (j<height-7) ? j+7 : height-1;
jp4 = (j<height-9) ? j+9 : height-1;
jp5 = (j<height-11) ? j+11 : height-1;
jp6 = (j<height-13) ? j+13 : height-1;
idx = (int)(8*src[w*jp6]
+5*src[w*jp5]
-30*src[w*jp4]
-18*src[w*jp3]
+113*src[w*jp2]
+242*src[w*jp1]
+192*src[w*jm1]
+35*src[w*jm2]
-38*src[w*jm3]
-10*src[w*jm4]
+11*src[w*jm5]
+2*src[w*jm6]+256)>>9;
/* FIR filter with 0.25 sample interval phase shift */
#if USE_CLIPTABLE
dst[w*((j>>1)+1)] = context->clp[idx];
#else
dst[w*((j>>1)+1)] = idx < 0 ? 0 : (idx > 255 ? 255 : idx);
#endif
}
src++;
dst++;
}
}
}