--- /dev/null
+/* $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.fr/>.
+ 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;
+
+ hb_buffer_t * buf;
+ 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;
+
+ if ( in->size <= 0 )
+ {
+ /* EOF on input stream - send it downstream & say that we're done */
+ *buf_out = in;
+ *buf_in = NULL;
+ return HB_WORK_DONE;
+ }
+
+ 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;
+
+ pv->buf = hb_buffer_init( 0xFFFF );
+ memcpy( pv->buf->data, in->data, in->size );
+ pv->buf->id = in->id;
+ pv->buf->sequence = in->sequence;
+ 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->data + pv->size_got, in->data, in->size );
+ pv->buf->id = in->id;
+ pv->buf->sequence = in->sequence;
+ pv->size_got += in->size;
+ if( in->start >= 0 )
+ {
+ pv->pts = in->start;
+ }
+ }
+ else
+ {
+ // bad size, must have lost sync
+ // force re-sync
+ if ( pv->buf != NULL )
+ hb_buffer_close( &pv->buf );
+ pv->size_sub = 0;
+ }
+
+ }
+
+ *buf_out = NULL;
+
+ if( pv->size_sub && pv->size_sub == pv->size_got )
+ {
+ pv->buf->size = pv->size_sub;
+
+ /* We got a complete subtitle, decode it */
+ *buf_out = Decode( w );
+
+ if( buf_out && *buf_out )
+ {
+ (*buf_out)->id = in->id;
+ (*buf_out)->sequence = in->sequence;
+ }
+
+ /* 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_decvobsub =
+{
+ WORK_DECVOBSUB,
+ "VOBSUB 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;
+ uint8_t * buf = pv->buf->data;
+
+ 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 = ( buf[i] << 8 ) | buf[i+1]; i += 2;
+ next = ( buf[i] << 8 ) | buf[i+1]; i += 2;
+
+ for( ;; )
+ {
+ command = 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->indepth_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] = (buf[i+0]>>4)&0x0f;
+ colors[1] = (buf[i+0])&0x0f;
+ colors[2] = (buf[i+1]>>4)&0x0f;
+ colors[3] = (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] = (buf[i+0]>>4)&0x0f;
+ alpha[2] = (buf[i+0])&0x0f;
+ alpha[1] = (buf[i+1]>>4)&0x0f;
+ alpha[0] = (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 = (buf[i+0]<<4) | ((buf[i+1]>>4)&0x0f);
+ pv->width = (((buf[i+1]&0x0f)<<8)| buf[i+2]) - pv->x + 1;
+ pv->y = (buf[i+3]<<4)| ((buf[i+4]>>4)&0x0f);
+ pv->height = (((buf[i+4]&0x0f)<<8)| buf[i+5]) - pv->y + 1;
+ i += 6;
+ break;
+ }
+ case 0x06: // 0x06 - SET_DSPXA - defines the pixel data addresses
+ {
+ pv->offsets[0] = ( buf[i] << 8 ) | buf[i+1]; i += 2;
+ pv->offsets[1] = ( buf[i] << 8 ) | 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->indepth_scan || ( w->subtitle->config.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;
+ }
+
+ if (w->subtitle->config.dest == PASSTHRUSUB)
+ {
+ pv->buf->start = pv->pts_start;
+ pv->buf->stop = pv->pts_stop;
+ return pv->buf;
+ }
+
+ /* Do the actual decoding now */
+ buf_raw = malloc( ( pv->width * pv->height ) * 4 );
+
+#define GET_NEXT_NIBBLE code = ( code << 4 ) | ( ( ( *offset & 1 ) ? \
+( pv->buf->data[((*offset)>>1)] & 0xF ) : ( pv->buf->data[((*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)++;
+ }
+ }
+
+ hb_buffer_close( &pv->buf );
+
+ /* Crop subtitle (remove transparent borders) */
+ buf = CropSubtitle( w, buf_raw );
+
+ free( buf_raw );
+
+ return buf;
+}
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