1 /* $Id: decsub.c,v 1.12 2005/04/14 17:37:54 titer Exp $
3 This file is part of the HandBrake source code.
4 Homepage: <http://handbrake.fr/>.
5 It may be used under the terms of the GNU General Public License. */
9 struct hb_work_private_s
34 static hb_buffer_t * Decode( hb_work_object_t * );
36 int decsubInit( hb_work_object_t * w, hb_job_t * job )
38 hb_work_private_t * pv;
40 pv = calloc( 1, sizeof( hb_work_private_t ) );
49 int decsubWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
50 hb_buffer_t ** buf_out )
52 hb_work_private_t * pv = w->private_data;
53 hb_buffer_t * in = *buf_in;
54 int size_sub, size_rle;
58 /* EOF on input stream - send it downstream & say that we're done */
64 pv->stream_id = in->id;
66 size_sub = ( in->data[0] << 8 ) | in->data[1];
67 size_rle = ( in->data[2] << 8 ) | in->data[3];
71 /* We are looking for the start of a new subtitle */
72 if( size_sub && size_rle && size_sub > size_rle &&
73 in->size <= size_sub )
75 /* Looks all right so far */
76 pv->size_sub = size_sub;
77 pv->size_rle = size_rle;
79 pv->buf = hb_buffer_init( 0xFFFF );
80 memcpy( pv->buf->data, in->data, in->size );
82 pv->buf->sequence = in->sequence;
83 pv->size_got = in->size;
89 /* We are waiting for the end of the current subtitle */
90 if( in->size <= pv->size_sub - pv->size_got )
92 memcpy( pv->buf->data + pv->size_got, in->data, in->size );
94 pv->buf->sequence = in->sequence;
95 pv->size_got += in->size;
105 if( pv->size_sub && pv->size_sub == pv->size_got )
107 pv->buf->size = pv->size_sub;
109 /* We got a complete subtitle, decode it */
110 *buf_out = Decode( w );
112 if( buf_out && *buf_out )
114 (*buf_out)->id = in->id;
115 (*buf_out)->sequence = in->sequence;
118 /* Wait for the next one */
128 void decsubClose( hb_work_object_t * w )
130 free( w->private_data );
133 hb_work_object_t hb_decvobsub =
143 /***********************************************************************
145 ***********************************************************************
146 * Get the start and end dates (relative to the PTS from the PES
147 * header), the width and height of the subpicture and the colors and
149 **********************************************************************/
150 static void ParseControls( hb_work_object_t * w )
152 hb_work_private_t * pv = w->private_data;
153 hb_job_t * job = pv->job;
154 hb_title_t * title = job->title;
155 hb_subtitle_t * subtitle;
156 uint8_t * buf = pv->buf->data;
171 for( i = pv->size_rle; ; )
173 date = ( buf[i] << 8 ) | buf[i+1]; i += 2;
174 next = ( buf[i] << 8 ) | buf[i+1]; i += 2;
181 * There are eight commands available for
182 * Sub-Pictures. The first SP_DCSQ should contain, as a
183 * minimum, SET_COLOR, SET_CONTR, SET_DAREA, and
187 if( command == 0xFF ) // 0xFF - CMD_END - ends one SP_DCSQ
194 case 0x00: // 0x00 - FSTA_DSP - Forced Start Display, no arguments
195 pv->pts_start = pv->pts + date * 900;
199 * If we are doing a subtitle scan then note down
201 if( job->indepth_scan )
203 for( n=0; n < hb_list_count(title->list_subtitle); n++ )
205 subtitle = hb_list_item( title->list_subtitle, n);
206 if( pv->stream_id == subtitle->id ) {
210 subtitle->forced_hits++;
216 case 0x01: // 0x01 - STA_DSP - Start Display, no arguments
217 pv->pts_start = pv->pts + date * 900;
221 case 0x02: // 0x02 - STP_DSP - Stop Display, no arguments
223 pv->pts_stop = pv->pts + date * 900;
226 case 0x03: // 0x03 - SET_COLOR - Set Colour indices
229 * SET_COLOR - provides four indices into the CLUT
230 * for the current PGC to associate with the four
236 colors[0] = (buf[i+0]>>4)&0x0f;
237 colors[1] = (buf[i+0])&0x0f;
238 colors[2] = (buf[i+1]>>4)&0x0f;
239 colors[3] = (buf[i+1])&0x0f;
241 for( j = 0; j < 4; j++ )
244 * Not sure what is happening here, in theory
245 * the palette is in YCbCr. And we want YUV.
247 * However it looks more like YCrCb (according
248 * to pgcedit). And the scalers for YCrCb don't
249 * work, but I get the right colours by doing
252 uint32_t color = title->palette[colors[j]];
254 y = (color>>16) & 0xff;
255 Cr = (color>>8) & 0xff;
258 pv->chromaU[3-j] = Cb;
259 pv->chromaV[3-j] = Cr;
260 /* hb_log("color[%d] y = %d, u = %d, v = %d",
270 case 0x04: // 0x04 - SET_CONTR - Set Contrast
273 * SET_CONTR - directly provides the four contrast
274 * (alpha blend) values to associate with the four
279 alpha[3] = (buf[i+0]>>4)&0x0f;
280 alpha[2] = (buf[i+0])&0x0f;
281 alpha[1] = (buf[i+1]>>4)&0x0f;
282 alpha[0] = (buf[i+1])&0x0f;
285 int lastAlpha = pv->alpha[3] + pv->alpha[2] + pv->alpha[1] + pv->alpha[0];
286 int currAlpha = alpha[3] + alpha[2] + alpha[1] + alpha[0];
288 // fading-in, save the highest alpha value
289 if( currAlpha > lastAlpha )
291 pv->alpha[3] = alpha[3];
292 pv->alpha[2] = alpha[2];
293 pv->alpha[1] = alpha[1];
294 pv->alpha[0] = alpha[0];
298 if( currAlpha < lastAlpha && !pv->pts_stop )
300 pv->pts_stop = pv->pts + date * 900;
306 case 0x05: // 0x05 - SET_DAREA - defines the display area
308 pv->x = (buf[i+0]<<4) | ((buf[i+1]>>4)&0x0f);
309 pv->width = (((buf[i+1]&0x0f)<<8)| buf[i+2]) - pv->x + 1;
310 pv->y = (buf[i+3]<<4)| ((buf[i+4]>>4)&0x0f);
311 pv->height = (((buf[i+4]&0x0f)<<8)| buf[i+5]) - pv->y + 1;
315 case 0x06: // 0x06 - SET_DSPXA - defines the pixel data addresses
317 pv->offsets[0] = ( buf[i] << 8 ) | buf[i+1]; i += 2;
318 pv->offsets[1] = ( buf[i] << 8 ) | buf[i+1]; i += 2;
335 /* Show it for 3 seconds */
336 pv->pts_stop = pv->pts_start + 3 * 90000;
340 /***********************************************************************
342 ***********************************************************************
343 * Given a raw decoded subtitle, detects transparent borders and
344 * returns a cropped subtitle in a hb_buffer_t ready to be used by
345 * the renderer, or NULL if the subtitle was completely transparent
346 **********************************************************************/
347 static int LineIsTransparent( hb_work_object_t * w, uint8_t * p )
349 hb_work_private_t * pv = w->private_data;
351 for( i = 0; i < pv->width; i++ )
360 static int ColumnIsTransparent( hb_work_object_t * w, uint8_t * p )
362 hb_work_private_t * pv = w->private_data;
364 for( i = 0; i < pv->height; i++ )
373 static hb_buffer_t * CropSubtitle( hb_work_object_t * w, uint8_t * raw )
375 hb_work_private_t * pv = w->private_data;
377 int crop[4] = { -1,-1,-1,-1 };
379 int realwidth, realheight;
381 uint8_t * lum_in, * lum_out, * alpha_in, * alpha_out;
382 uint8_t * u_in, * u_out, * v_in, * v_out;
384 alpha = raw + pv->width * pv->height;
387 for( i = 0; i < pv->height; i++ )
389 if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
403 for( i = pv->height - 1; i >= 0; i-- )
405 if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
413 for( i = 0; i < pv->width; i++ )
415 if( !ColumnIsTransparent( w, &alpha[i] ) )
423 for( i = pv->width - 1; i >= 0; i-- )
425 if( !ColumnIsTransparent( w, &alpha[i] ) )
432 realwidth = crop[3] - crop[2] + 1;
433 realheight = crop[1] - crop[0] + 1;
435 buf = hb_buffer_init( realwidth * realheight * 4 );
436 buf->start = pv->pts_start;
437 buf->stop = pv->pts_stop;
438 buf->x = pv->x + crop[2];
439 buf->y = pv->y + crop[0];
440 buf->width = realwidth;
441 buf->height = realheight;
443 lum_in = raw + crop[0] * pv->width + crop[2];
444 alpha_in = lum_in + pv->width * pv->height;
445 u_in = alpha_in + pv->width * pv->height;
446 v_in = u_in + pv->width * pv->height;
449 alpha_out = lum_out + realwidth * realheight;
450 u_out = alpha_out + realwidth * realheight;
451 v_out = u_out + realwidth * realheight;
453 for( i = 0; i < realheight; i++ )
455 memcpy( lum_out, lum_in, realwidth );
456 memcpy( alpha_out, alpha_in, realwidth );
457 memcpy( u_out, u_in, realwidth );
458 memcpy( v_out, v_in, realwidth );
461 alpha_in += pv->width;
465 lum_out += realwidth;
466 alpha_out += realwidth;
474 static hb_buffer_t * Decode( hb_work_object_t * w )
476 hb_work_private_t * pv = w->private_data;
481 uint8_t * buf_raw = NULL;
482 hb_job_t * job = pv->job;
484 /* Get infos about the subtitle */
487 if( job->indepth_scan || ( w->subtitle->config.force && pv->pts_forced == 0 ) )
490 * Don't encode subtitles when doing a scan.
492 * When forcing subtitles, ignore all those that don't
493 * have the forced flag set.
498 if (w->subtitle->config.dest == PASSTHRUSUB)
500 pv->buf->start = pv->pts_start;
501 pv->buf->stop = pv->pts_stop;
505 /* Do the actual decoding now */
506 buf_raw = malloc( ( pv->width * pv->height ) * 4 );
508 #define GET_NEXT_NIBBLE code = ( code << 4 ) | ( ( ( *offset & 1 ) ? \
509 ( pv->buf->data[((*offset)>>1)] & 0xF ) : ( pv->buf->data[((*offset)>>1)] >> 4 ) ) ); \
512 offsets[0] = pv->offsets[0] * 2;
513 offsets[1] = pv->offsets[1] * 2;
515 for( line = 0; line < pv->height; line++ )
517 /* Select even or odd field */
518 offset = ( line & 1 ) ? &offsets[1] : &offsets[0];
520 for( col = 0; col < pv->width; col += code >> 2 )
522 uint8_t * lum, * alpha, * chromaU, * chromaV;
538 code |= ( pv->width - col ) << 2;
545 alpha = lum + pv->width * pv->height;
546 chromaU = alpha + pv->width * pv->height;
547 chromaV = chromaU + pv->width * pv->height;
549 memset( lum + line * pv->width + col,
550 pv->lum[code & 3], code >> 2 );
551 memset( alpha + line * pv->width + col,
552 pv->alpha[code & 3], code >> 2 );
553 memset( chromaU + line * pv->width + col,
554 pv->chromaU[code & 3], code >> 2 );
555 memset( chromaV + line * pv->width + col,
556 pv->chromaV[code & 3], code >> 2 );
566 hb_buffer_close( &pv->buf );
568 /* Crop subtitle (remove transparent borders) */
569 buf = CropSubtitle( w, buf_raw );