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/*
* subpic_encode.c - encodes a pixmap with RLE
*
* Copyright (C) 2000 Alejandro J. Cura <alecu@protocultura.net>
*
* (modified a bit to work with the dxr3 driver...4/2/2002 cg)
*
* Based on the hard work of:
*
* Samuel Hocevar <sam@via.ecp.fr> and Michel Lespinasse <walken@via.ecp.fr>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include "unistd.h"
#include "spuenc.h"
static void
encode_do_control(int x,int y, encodedata* ed, pixbuf* pb) {
int controlstart= ed->count;
int x1;
int i;
unsigned int top, left, bottom, right;
top= 450 - pb->y/2;
left=(720 / 2) - (pb->x / 2);
top= 32;//this forces the first bit to be visible on a TV
left= 32;//you could actually pass in x/y and do some nice
//calculations for making it look right...
bottom= top + pb->y - 1;
right= left + pb->x - 1;
/* the format of this is well described by a page:
* http://members.aol.com/mpucoder/DVD/spu.html
*
* note I changed the layout of commands to turn off the subpic as the
* first command, and then turn on the new subpic...this is so we can
* leave the subpic on for an arbitrary ammount of time as controlled by
* mplayer (ie when we turn on the subpic we don't know how long it should
* stay on when using mplayer).
* with this layout we turn off the last subpic as we are turning on the
* new one.
* The original hd it turn on the subpic, and delay the turn off command using
* the durration/delay feature.
* */
/* start at x0+2*/
i= controlstart;
/* display duration... */
// ed->data[i++]= 0x00;
// ed->data[i++]= 0x00; //durration before turn off command occurs
//in 90000/1024 units
/* x1 */
// x1=i+4;
// ed->data[i++]= x1 >> 8;//location of next command block
// ed->data[i++]= x1 & 0xff;
/* finish it */
// ed->data[i++]= 0x02;//turn off command
// ed->data[i++]= 0xff;//end of command block
x1= i; //marker for last command block address
/* display duration... */
ed->data[i++]= 0x00;
ed->data[i++]= 0x00; //durration before turn on command occurs
//in 90000/1024 units
/* x1 */
ed->data[i++]= x1 >> 8; //since this is the last command block, this
ed->data[i++]= x1 & 0xff;//points back to itself
/* 0x01: start displaying */
ed->data[i++]= 0x01;
/* 0x03: palette info */
ed->data[i++]= 0x03;
ed->data[i++]= 0x08;
ed->data[i++]= 0x7f;
/*
* The palette is a coded index (one of 16) 0 is black, 0xf is white
* (unless you screw with the default palette)
* for what I am doing I only use white.
* 7 is lt grey, and 8 is dk grey...
* */
/* 0x04: transparency info (reversed) */
ed->data[i++]= 0x04;
ed->data[i++]= 0xFF;//change the opacity values of the color entries
ed->data[i++]= 0xF0;//say if you wanted white text on a black backround
//note you will have to work harder, by finding the
//bounding box of the text, and use a non transparent black palette
// entry to fill the backround with, (say color 1 instead of 0)
/* 0x05: coordinates */
ed->data[i++]= 0x05;
ed->data[i++]= left >> 4;
ed->data[i++]= ((left&0xf)<<4)+(right>>8);
ed->data[i++]= (right&0xff);
ed->data[i++]= top >> 4;
ed->data[i++]= ((top&0xf)<<4)+(bottom>>8);
ed->data[i++]= (bottom&0xff);
/* 0x06: both fields' offsets */
ed->data[i++]= 0x06;
ed->data[i++]= 0x00;
ed->data[i++]= 0x04;
ed->data[i++]= ed->oddstart >> 8;
ed->data[i++]= ed->oddstart & 0xff;
/* 0xFF: end sequence */
ed->data[i++]= 0xFF;
if(! i&1 ) {
ed->data[i++]= 0xff;
}
/* x0 */
ed->data[2]= (controlstart) >> 8;
ed->data[3]= (controlstart) & 0xff;
/* packet size */
ed->data[0]= i >> 8;
ed->data[1]= i & 0xff;
ed->count= i;
}
static void
encode_put_nibble( encodedata* ed, unsigned char nibble ) {
if( ed->nibblewaiting ) {
ed->data[ed->count++]|= nibble;
ed->nibblewaiting= 0;
} else {
ed->data[ed->count]= nibble<<4;
ed->nibblewaiting= 1;
}
}
static void
encode_pixels( encodedata* ed, int color, int number ) {
if(number > 3) {
if(number > 15) {
encode_put_nibble( ed, 0 );
if(number > 63) {
encode_put_nibble( ed, (number & 0xC0)>>6 );
}
}
encode_put_nibble( ed, (number & 0x3C)>>2 );
}
encode_put_nibble( ed, ((number & 0xF)<<2) | color);
}
static void
encode_eol( encodedata* ed ) {
if( ed->nibblewaiting ) {
ed->count++;
ed->nibblewaiting= 0;
}
ed->data[ed->count++]= 0x00;
ed->data[ed->count++]= 0x00;
}
static void
encode_do_row( encodedata* ed, pixbuf* pb, int row ) {
int i= 0;
unsigned char* pix= pb->pixels + row * pb->x;
int color= *pix;
int n= 0; /* the number of pixels of this color */
while( i++ < pb->x ) {
/* FIXME: watch this space for EOL */
if( *pix != color || n == 255 ) {
encode_pixels( ed, color, n );
color= *pix;
n= 1;
} else {
n++;
}
pix++;
}
/* this small optimization: (n>63) can save up to two bytes per line
* I wonder if this is compatible with all the hardware... */
if( color == 0 && n > 63 ) {
encode_eol( ed );
} else {
encode_pixels( ed, color, n );
}
if( ed->nibblewaiting ) {
ed->count++;
ed->nibblewaiting= 0;
}
}
void
pixbuf_encode_rle(int x, int y, int w, int h, char *inbuf, int stride,encodedata *ed){
pixbuf pb;
int i, row;
pb.x = w;
pb.y = h;
pb.pixels = inbuf;
ed->count= 4;
ed->nibblewaiting= 0;
row= 0;
for( i= 0; i < pb.y; i++ ) {
encode_do_row(ed, &pb, row);
row+= 2;
if( row > pb.y ) {
row= 1;
ed->oddstart= ed->count;
}
}
encode_do_control(x,y, ed, &pb);
}
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