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/* $Id: decsub.c,v 1.12 2005/04/14 17:37:54 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.m0k.org/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
struct hb_work_private_s
{
hb_job_t * job;
uint8_t buf[0xFFFF];
int size_sub;
int size_got;
int size_rle;
int64_t pts;
int64_t pts_start;
int64_t pts_stop;
int pts_forced;
int x;
int y;
int width;
int height;
int stream_id;
int offsets[2];
uint8_t lum[4];
uint8_t chromaU[4];
uint8_t chromaV[4];
uint8_t alpha[4];
};
static hb_buffer_t * Decode( hb_work_object_t * );
int decsubInit( hb_work_object_t * w, hb_job_t * job )
{
hb_work_private_t * pv;
pv = calloc( 1, sizeof( hb_work_private_t ) );
w->private_data = pv;
pv->job = job;
pv->pts = -1;
return 0;
}
int decsubWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_buffer_t * in = *buf_in;
int size_sub, size_rle;
pv->stream_id = in->id;
size_sub = ( in->data[0] << 8 ) | in->data[1];
size_rle = ( in->data[2] << 8 ) | in->data[3];
if( !pv->size_sub )
{
/* We are looking for the start of a new subtitle */
if( size_sub && size_rle && size_sub > size_rle &&
in->size <= size_sub )
{
/* Looks all right so far */
pv->size_sub = size_sub;
pv->size_rle = size_rle;
memcpy( pv->buf, in->data, in->size );
pv->size_got = in->size;
pv->pts = in->start;
}
}
else
{
/* We are waiting for the end of the current subtitle */
if( in->size <= pv->size_sub - pv->size_got )
{
memcpy( pv->buf + pv->size_got, in->data, in->size );
pv->size_got += in->size;
if( in->start >= 0 )
{
pv->pts = in->start;
}
}
}
*buf_out = NULL;
if( pv->size_sub && pv->size_sub == pv->size_got )
{
/* We got a complete subtitle, decode it */
*buf_out = Decode( w );
/* Wait for the next one */
pv->size_sub = 0;
pv->size_got = 0;
pv->size_rle = 0;
pv->pts = -1;
}
return HB_WORK_OK;
}
void decsubClose( hb_work_object_t * w )
{
free( w->private_data );
}
hb_work_object_t hb_decsub =
{
WORK_DECSUB,
"Subtitle decoder",
decsubInit,
decsubWork,
decsubClose
};
/***********************************************************************
* ParseControls
***********************************************************************
* Get the start and end dates (relative to the PTS from the PES
* header), the width and height of the subpicture and the colors and
* alphas used in it
**********************************************************************/
static void ParseControls( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
hb_job_t * job = pv->job;
hb_title_t * title = job->title;
hb_subtitle_t * subtitle;
int i, n;
int command;
int date, next;
pv->pts_start = 0;
pv->pts_stop = 0;
pv->pts_forced = 0;
pv->alpha[3] = 0;
pv->alpha[2] = 0;
pv->alpha[1] = 0;
pv->alpha[0] = 0;
for( i = pv->size_rle; ; )
{
date = ( pv->buf[i] << 8 ) | pv->buf[i+1]; i += 2;
next = ( pv->buf[i] << 8 ) | pv->buf[i+1]; i += 2;
for( ;; )
{
command = pv->buf[i++];
/*
* There are eight commands available for
* Sub-Pictures. The first SP_DCSQ should contain, as a
* minimum, SET_COLOR, SET_CONTR, SET_DAREA, and
* SET_DSPXA
*/
if( command == 0xFF ) // 0xFF - CMD_END - ends one SP_DCSQ
{
break;
}
switch( command )
{
case 0x00: // 0x00 - FSTA_DSP - Forced Start Display, no arguments
pv->pts_start = pv->pts + date * 900;
pv->pts_forced = 1;
/*
* If we are doing a subtitle scan then note down
*/
if( job->subtitle_scan )
{
for( n=0; n < hb_list_count(title->list_subtitle); n++ )
{
subtitle = hb_list_item( title->list_subtitle, n);
if( pv->stream_id == subtitle->id ) {
/*
* A hit, count it.
*/
subtitle->forced_hits++;
}
}
}
break;
case 0x01: // 0x01 - STA_DSP - Start Display, no arguments
pv->pts_start = pv->pts + date * 900;
pv->pts_forced = 0;
break;
case 0x02: // 0x02 - STP_DSP - Stop Display, no arguments
if(!pv->pts_stop)
pv->pts_stop = pv->pts + date * 900;
break;
case 0x03: // 0x03 - SET_COLOR - Set Colour indices
{
/*
* SET_COLOR - provides four indices into the CLUT
* for the current PGC to associate with the four
* pixel values
*/
int colors[4];
int j;
colors[0] = (pv->buf[i+0]>>4)&0x0f;
colors[1] = (pv->buf[i+0])&0x0f;
colors[2] = (pv->buf[i+1]>>4)&0x0f;
colors[3] = (pv->buf[i+1])&0x0f;
for( j = 0; j < 4; j++ )
{
/*
* Not sure what is happening here, in theory
* the palette is in YCbCr. And we want YUV.
*
* However it looks more like YCrCb (according
* to pgcedit). And the scalers for YCrCb don't
* work, but I get the right colours by doing
* no conversion.
*/
uint32_t color = title->palette[colors[j]];
uint8_t Cr, Cb, y;
y = (color>>16) & 0xff;
Cr = (color>>8) & 0xff;
Cb = (color) & 0xff;
pv->lum[3-j] = y;
pv->chromaU[3-j] = Cb;
pv->chromaV[3-j] = Cr;
/* hb_log("color[%d] y = %d, u = %d, v = %d",
3-j,
pv->lum[3-j],
pv->chromaU[3-j],
pv->chromaV[3-j]);
*/
}
i += 2;
break;
}
case 0x04: // 0x04 - SET_CONTR - Set Contrast
{
/*
* SET_CONTR - directly provides the four contrast
* (alpha blend) values to associate with the four
* pixel values
*/
uint8_t alpha[4];
alpha[3] = (pv->buf[i+0]>>4)&0x0f;
alpha[2] = (pv->buf[i+0])&0x0f;
alpha[1] = (pv->buf[i+1]>>4)&0x0f;
alpha[0] = (pv->buf[i+1])&0x0f;
int lastAlpha = pv->alpha[3] + pv->alpha[2] + pv->alpha[1] + pv->alpha[0];
int currAlpha = alpha[3] + alpha[2] + alpha[1] + alpha[0];
// fading-in, save the highest alpha value
if( currAlpha > lastAlpha )
{
pv->alpha[3] = alpha[3];
pv->alpha[2] = alpha[2];
pv->alpha[1] = alpha[1];
pv->alpha[0] = alpha[0];
}
// fading-out
if( currAlpha < lastAlpha && !pv->pts_stop )
{
pv->pts_stop = pv->pts + date * 900;
}
i += 2;
break;
}
case 0x05: // 0x05 - SET_DAREA - defines the display area
{
pv->x = (pv->buf[i+0]<<4) | ((pv->buf[i+1]>>4)&0x0f);
pv->width = (((pv->buf[i+1]&0x0f)<<8)| pv->buf[i+2]) - pv->x + 1;
pv->y = (pv->buf[i+3]<<4)| ((pv->buf[i+4]>>4)&0x0f);
pv->height = (((pv->buf[i+4]&0x0f)<<8)| pv->buf[i+5]) - pv->y + 1;
i += 6;
break;
}
case 0x06: // 0x06 - SET_DSPXA - defines the pixel data addresses
{
pv->offsets[0] = ( pv->buf[i] << 8 ) | pv->buf[i+1]; i += 2;
pv->offsets[1] = ( pv->buf[i] << 8 ) | pv->buf[i+1]; i += 2;
break;
}
}
}
if( i > next )
{
break;
}
i = next;
}
if( !pv->pts_stop )
{
/* Show it for 3 seconds */
pv->pts_stop = pv->pts_start + 3 * 90000;
}
}
/***********************************************************************
* CropSubtitle
***********************************************************************
* Given a raw decoded subtitle, detects transparent borders and
* returns a cropped subtitle in a hb_buffer_t ready to be used by
* the renderer, or NULL if the subtitle was completely transparent
**********************************************************************/
static int LineIsTransparent( hb_work_object_t * w, uint8_t * p )
{
hb_work_private_t * pv = w->private_data;
int i;
for( i = 0; i < pv->width; i++ )
{
if( p[i] )
{
return 0;
}
}
return 1;
}
static int ColumnIsTransparent( hb_work_object_t * w, uint8_t * p )
{
hb_work_private_t * pv = w->private_data;
int i;
for( i = 0; i < pv->height; i++ )
{
if( p[i*pv->width] )
{
return 0;
}
}
return 1;
}
static hb_buffer_t * CropSubtitle( hb_work_object_t * w, uint8_t * raw )
{
hb_work_private_t * pv = w->private_data;
int i;
int crop[4] = { -1,-1,-1,-1 };
uint8_t * alpha;
int realwidth, realheight;
hb_buffer_t * buf;
uint8_t * lum_in, * lum_out, * alpha_in, * alpha_out;
uint8_t * u_in, * u_out, * v_in, * v_out;
alpha = raw + pv->width * pv->height;
/* Top */
for( i = 0; i < pv->height; i++ )
{
if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
{
crop[0] = i;
break;
}
}
if( crop[0] < 0 )
{
/* Empty subtitle */
return NULL;
}
/* Bottom */
for( i = pv->height - 1; i >= 0; i-- )
{
if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
{
crop[1] = i;
break;
}
}
/* Left */
for( i = 0; i < pv->width; i++ )
{
if( !ColumnIsTransparent( w, &alpha[i] ) )
{
crop[2] = i;
break;
}
}
/* Right */
for( i = pv->width - 1; i >= 0; i-- )
{
if( !ColumnIsTransparent( w, &alpha[i] ) )
{
crop[3] = i;
break;
}
}
realwidth = crop[3] - crop[2] + 1;
realheight = crop[1] - crop[0] + 1;
buf = hb_buffer_init( realwidth * realheight * 4 );
buf->start = pv->pts_start;
buf->stop = pv->pts_stop;
buf->x = pv->x + crop[2];
buf->y = pv->y + crop[0];
buf->width = realwidth;
buf->height = realheight;
lum_in = raw + crop[0] * pv->width + crop[2];
alpha_in = lum_in + pv->width * pv->height;
u_in = alpha_in + pv->width * pv->height;
v_in = u_in + pv->width * pv->height;
lum_out = buf->data;
alpha_out = lum_out + realwidth * realheight;
u_out = alpha_out + realwidth * realheight;
v_out = u_out + realwidth * realheight;
for( i = 0; i < realheight; i++ )
{
memcpy( lum_out, lum_in, realwidth );
memcpy( alpha_out, alpha_in, realwidth );
memcpy( u_out, u_in, realwidth );
memcpy( v_out, v_in, realwidth );
lum_in += pv->width;
alpha_in += pv->width;
u_in += pv->width;
v_in += pv->width;
lum_out += realwidth;
alpha_out += realwidth;
u_out += realwidth;
v_out += realwidth;
}
return buf;
}
static hb_buffer_t * Decode( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
int code, line, col;
int offsets[2];
int * offset;
hb_buffer_t * buf;
uint8_t * buf_raw = NULL;
hb_job_t * job = pv->job;
/* Get infos about the subtitle */
ParseControls( w );
if( job->subtitle_scan || ( job->subtitle_force && pv->pts_forced == 0 ) )
{
/*
* Don't encode subtitles when doing a scan.
*
* When forcing subtitles, ignore all those that don't
* have the forced flag set.
*/
return NULL;
}
/* Do the actual decoding now */
buf_raw = malloc( ( pv->width * pv->height ) * 4 );
#define GET_NEXT_NIBBLE code = ( code << 4 ) | ( ( ( *offset & 1 ) ? \
( pv->buf[((*offset)>>1)] & 0xF ) : ( pv->buf[((*offset)>>1)] >> 4 ) ) ); \
(*offset)++
offsets[0] = pv->offsets[0] * 2;
offsets[1] = pv->offsets[1] * 2;
for( line = 0; line < pv->height; line++ )
{
/* Select even or odd field */
offset = ( line & 1 ) ? &offsets[1] : &offsets[0];
for( col = 0; col < pv->width; col += code >> 2 )
{
uint8_t * lum, * alpha, * chromaU, * chromaV;
code = 0;
GET_NEXT_NIBBLE;
if( code < 0x4 )
{
GET_NEXT_NIBBLE;
if( code < 0x10 )
{
GET_NEXT_NIBBLE;
if( code < 0x40 )
{
GET_NEXT_NIBBLE;
if( code < 0x100 )
{
/* End of line */
code |= ( pv->width - col ) << 2;
}
}
}
}
lum = buf_raw;
alpha = lum + pv->width * pv->height;
chromaU = alpha + pv->width * pv->height;
chromaV = chromaU + pv->width * pv->height;
memset( lum + line * pv->width + col,
pv->lum[code & 3], code >> 2 );
memset( alpha + line * pv->width + col,
pv->alpha[code & 3], code >> 2 );
memset( chromaU + line * pv->width + col,
pv->chromaU[code & 3], code >> 2 );
memset( chromaV + line * pv->width + col,
pv->chromaV[code & 3], code >> 2 );
}
/* Byte-align */
if( *offset & 1 )
{
(*offset)++;
}
}
/* Crop subtitle (remove transparent borders) */
buf = CropSubtitle( w, buf_raw );
free( buf_raw );
return buf;
}
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