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;
103 // bad size, must have lost sync
105 if ( pv->buf != NULL )
106 hb_buffer_close( &pv->buf );
114 if( pv->size_sub && pv->size_sub == pv->size_got )
116 pv->buf->size = pv->size_sub;
118 /* We got a complete subtitle, decode it */
119 *buf_out = Decode( w );
121 if( buf_out && *buf_out )
123 (*buf_out)->id = in->id;
124 (*buf_out)->sequence = in->sequence;
127 /* Wait for the next one */
137 void decsubClose( hb_work_object_t * w )
139 hb_work_private_t * pv = w->private_data;
142 hb_buffer_close( &pv->buf );
143 free( w->private_data );
146 hb_work_object_t hb_decvobsub =
156 /***********************************************************************
158 ***********************************************************************
159 * Get the start and end dates (relative to the PTS from the PES
160 * header), the width and height of the subpicture and the colors and
162 **********************************************************************/
163 static void ParseControls( hb_work_object_t * w )
165 hb_work_private_t * pv = w->private_data;
166 hb_job_t * job = pv->job;
167 hb_title_t * title = job->title;
168 hb_subtitle_t * subtitle;
169 uint8_t * buf = pv->buf->data;
184 for( i = pv->size_rle; ; )
186 date = ( buf[i] << 8 ) | buf[i+1]; i += 2;
187 next = ( buf[i] << 8 ) | buf[i+1]; i += 2;
194 * There are eight commands available for
195 * Sub-Pictures. The first SP_DCSQ should contain, as a
196 * minimum, SET_COLOR, SET_CONTR, SET_DAREA, and
200 if( command == 0xFF ) // 0xFF - CMD_END - ends one SP_DCSQ
207 case 0x00: // 0x00 - FSTA_DSP - Forced Start Display, no arguments
208 pv->pts_start = pv->pts + date * 900;
212 * If we are doing a subtitle scan then note down
214 if( job->indepth_scan )
216 for( n=0; n < hb_list_count(title->list_subtitle); n++ )
218 subtitle = hb_list_item( title->list_subtitle, n);
219 if( pv->stream_id == subtitle->id ) {
223 subtitle->forced_hits++;
229 case 0x01: // 0x01 - STA_DSP - Start Display, no arguments
230 pv->pts_start = pv->pts + date * 900;
234 case 0x02: // 0x02 - STP_DSP - Stop Display, no arguments
236 pv->pts_stop = pv->pts + date * 900;
239 case 0x03: // 0x03 - SET_COLOR - Set Colour indices
242 * SET_COLOR - provides four indices into the CLUT
243 * for the current PGC to associate with the four
249 colors[0] = (buf[i+0]>>4)&0x0f;
250 colors[1] = (buf[i+0])&0x0f;
251 colors[2] = (buf[i+1]>>4)&0x0f;
252 colors[3] = (buf[i+1])&0x0f;
254 for( j = 0; j < 4; j++ )
257 * Not sure what is happening here, in theory
258 * the palette is in YCbCr. And we want YUV.
260 * However it looks more like YCrCb (according
261 * to pgcedit). And the scalers for YCrCb don't
262 * work, but I get the right colours by doing
265 uint32_t color = title->palette[colors[j]];
267 y = (color>>16) & 0xff;
268 Cr = (color>>8) & 0xff;
271 pv->chromaU[3-j] = Cb;
272 pv->chromaV[3-j] = Cr;
273 /* hb_log("color[%d] y = %d, u = %d, v = %d",
283 case 0x04: // 0x04 - SET_CONTR - Set Contrast
286 * SET_CONTR - directly provides the four contrast
287 * (alpha blend) values to associate with the four
292 alpha[3] = (buf[i+0]>>4)&0x0f;
293 alpha[2] = (buf[i+0])&0x0f;
294 alpha[1] = (buf[i+1]>>4)&0x0f;
295 alpha[0] = (buf[i+1])&0x0f;
298 int lastAlpha = pv->alpha[3] + pv->alpha[2] + pv->alpha[1] + pv->alpha[0];
299 int currAlpha = alpha[3] + alpha[2] + alpha[1] + alpha[0];
301 // fading-in, save the highest alpha value
302 if( currAlpha > lastAlpha )
304 pv->alpha[3] = alpha[3];
305 pv->alpha[2] = alpha[2];
306 pv->alpha[1] = alpha[1];
307 pv->alpha[0] = alpha[0];
311 if( currAlpha < lastAlpha && !pv->pts_stop )
313 pv->pts_stop = pv->pts + date * 900;
319 case 0x05: // 0x05 - SET_DAREA - defines the display area
321 pv->x = (buf[i+0]<<4) | ((buf[i+1]>>4)&0x0f);
322 pv->width = (((buf[i+1]&0x0f)<<8)| buf[i+2]) - pv->x + 1;
323 pv->y = (buf[i+3]<<4)| ((buf[i+4]>>4)&0x0f);
324 pv->height = (((buf[i+4]&0x0f)<<8)| buf[i+5]) - pv->y + 1;
328 case 0x06: // 0x06 - SET_DSPXA - defines the pixel data addresses
330 pv->offsets[0] = ( buf[i] << 8 ) | buf[i+1]; i += 2;
331 pv->offsets[1] = ( buf[i] << 8 ) | buf[i+1]; i += 2;
348 /* Show it for 3 seconds */
349 pv->pts_stop = pv->pts_start + 3 * 90000;
353 /***********************************************************************
355 ***********************************************************************
356 * Given a raw decoded subtitle, detects transparent borders and
357 * returns a cropped subtitle in a hb_buffer_t ready to be used by
358 * the renderer, or NULL if the subtitle was completely transparent
359 **********************************************************************/
360 static int LineIsTransparent( hb_work_object_t * w, uint8_t * p )
362 hb_work_private_t * pv = w->private_data;
364 for( i = 0; i < pv->width; i++ )
373 static int ColumnIsTransparent( hb_work_object_t * w, uint8_t * p )
375 hb_work_private_t * pv = w->private_data;
377 for( i = 0; i < pv->height; i++ )
386 static hb_buffer_t * CropSubtitle( hb_work_object_t * w, uint8_t * raw )
388 hb_work_private_t * pv = w->private_data;
390 int crop[4] = { -1,-1,-1,-1 };
392 int realwidth, realheight;
394 uint8_t * lum_in, * lum_out, * alpha_in, * alpha_out;
395 uint8_t * u_in, * u_out, * v_in, * v_out;
397 alpha = raw + pv->width * pv->height;
400 for( i = 0; i < pv->height; i++ )
402 if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
416 for( i = pv->height - 1; i >= 0; i-- )
418 if( !LineIsTransparent( w, &alpha[i*pv->width] ) )
426 for( i = 0; i < pv->width; i++ )
428 if( !ColumnIsTransparent( w, &alpha[i] ) )
436 for( i = pv->width - 1; i >= 0; i-- )
438 if( !ColumnIsTransparent( w, &alpha[i] ) )
445 realwidth = crop[3] - crop[2] + 1;
446 realheight = crop[1] - crop[0] + 1;
448 buf = hb_buffer_init( realwidth * realheight * 4 );
449 buf->start = pv->pts_start;
450 buf->stop = pv->pts_stop;
451 buf->x = pv->x + crop[2];
452 buf->y = pv->y + crop[0];
453 buf->width = realwidth;
454 buf->height = realheight;
456 lum_in = raw + crop[0] * pv->width + crop[2];
457 alpha_in = lum_in + pv->width * pv->height;
458 u_in = alpha_in + pv->width * pv->height;
459 v_in = u_in + pv->width * pv->height;
462 alpha_out = lum_out + realwidth * realheight;
463 u_out = alpha_out + realwidth * realheight;
464 v_out = u_out + realwidth * realheight;
466 for( i = 0; i < realheight; i++ )
468 memcpy( lum_out, lum_in, realwidth );
469 memcpy( alpha_out, alpha_in, realwidth );
470 memcpy( u_out, u_in, realwidth );
471 memcpy( v_out, v_in, realwidth );
474 alpha_in += pv->width;
478 lum_out += realwidth;
479 alpha_out += realwidth;
487 static hb_buffer_t * Decode( hb_work_object_t * w )
489 hb_work_private_t * pv = w->private_data;
494 uint8_t * buf_raw = NULL;
495 hb_job_t * job = pv->job;
497 /* Get infos about the subtitle */
500 if( job->indepth_scan || ( w->subtitle->config.force && pv->pts_forced == 0 ) )
503 * Don't encode subtitles when doing a scan.
505 * When forcing subtitles, ignore all those that don't
506 * have the forced flag set.
508 hb_buffer_close( &pv->buf );
512 if (w->subtitle->config.dest == PASSTHRUSUB)
514 pv->buf->start = pv->pts_start;
515 pv->buf->stop = pv->pts_stop;
521 /* Do the actual decoding now */
522 buf_raw = malloc( ( pv->width * pv->height ) * 4 );
524 #define GET_NEXT_NIBBLE code = ( code << 4 ) | ( ( ( *offset & 1 ) ? \
525 ( pv->buf->data[((*offset)>>1)] & 0xF ) : ( pv->buf->data[((*offset)>>1)] >> 4 ) ) ); \
528 offsets[0] = pv->offsets[0] * 2;
529 offsets[1] = pv->offsets[1] * 2;
531 for( line = 0; line < pv->height; line++ )
533 /* Select even or odd field */
534 offset = ( line & 1 ) ? &offsets[1] : &offsets[0];
536 for( col = 0; col < pv->width; col += code >> 2 )
538 uint8_t * lum, * alpha, * chromaU, * chromaV;
554 code |= ( pv->width - col ) << 2;
561 alpha = lum + pv->width * pv->height;
562 chromaU = alpha + pv->width * pv->height;
563 chromaV = chromaU + pv->width * pv->height;
565 memset( lum + line * pv->width + col,
566 pv->lum[code & 3], code >> 2 );
567 memset( alpha + line * pv->width + col,
568 pv->alpha[code & 3], code >> 2 );
569 memset( chromaU + line * pv->width + col,
570 pv->chromaU[code & 3], code >> 2 );
571 memset( chromaV + line * pv->width + col,
572 pv->chromaV[code & 3], code >> 2 );
582 hb_buffer_close( &pv->buf );
584 /* Crop subtitle (remove transparent borders) */
585 buf = CropSubtitle( w, buf_raw );