HandBrake 0.7.0

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@16 b64f7644-9d1e-0410-96f1-a4d463321fa5

1 files changed, 420 insertions, 0 deletions

diff --git a/libhb/decsub.c b/libhb/decsub.c
new file mode 100644
index 000000000..72f742bd9
--- /dev/null
+++ b/libhb/decsub.c
@@ -0,0 +1,420 @@
+/* $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_object_s
+{
+    HB_WORK_COMMON;
+
+    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        x;
+    int        y;
+    int        width;
+    int        height;
+
+    int        offsets[2];
+    uint8_t    lum[4];
+    uint8_t    alpha[4];
+};
+
+
+/***********************************************************************
+ * Local prototypes
+ **********************************************************************/
+static void          Close( hb_work_object_t ** _w );
+static int           Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                           hb_buffer_t ** buf_out );
+static hb_buffer_t * Decode( hb_work_object_t * w );
+static void          ParseControls( hb_work_object_t * w );
+static hb_buffer_t * CropSubtitle( hb_work_object_t * w,
+                                   uint8_t * raw );
+
+/***********************************************************************
+ * hb_work_decsub_init
+ ***********************************************************************
+ *
+ **********************************************************************/
+hb_work_object_t * hb_work_decsub_init( hb_job_t * job )
+{
+    hb_work_object_t * w = calloc( sizeof( hb_work_object_t ), 1 );
+    w->name  = strdup( "Subtitle decoder" );
+    w->work  = Work;
+    w->close = Close;
+
+    w->job   = job;
+    w->pts   = -1;
+
+    return w;
+}
+
+/***********************************************************************
+ * Close
+ ***********************************************************************
+ * Free memory
+ **********************************************************************/
+static void Close( hb_work_object_t ** _w )
+{
+    hb_work_object_t * w = *_w;
+    free( w->name );
+    free( w );
+    *_w = NULL;
+}
+
+/***********************************************************************
+ * Work
+ ***********************************************************************
+ *
+ **********************************************************************/
+static int Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                 hb_buffer_t ** buf_out )
+{
+    hb_buffer_t * in = *buf_in;
+
+    int size_sub, size_rle;
+
+    size_sub = ( in->data[0] << 8 ) | in->data[1];
+    size_rle = ( in->data[2] << 8 ) | in->data[3];
+
+    if( !w->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 */
+            w->size_sub = size_sub;
+            w->size_rle = size_rle;
+
+            memcpy( w->buf, in->data, in->size );
+            w->size_got = in->size;
+            w->pts      = in->start;
+        }
+    }
+    else
+    {
+        /* We are waiting for the end of the current subtitle */
+        if( in->size <= w->size_sub - w->size_got )
+        {
+            memcpy( w->buf + w->size_got, in->data, in->size );
+            w->size_got += in->size;
+            if( in->start >= 0 )
+            {
+                w->pts = in->start;
+            }
+        }
+    }
+
+    *buf_out = NULL;
+
+    if( w->size_sub && w->size_sub == w->size_got )
+    {
+        /* We got a complete subtitle, decode it */
+        *buf_out = Decode( w );
+
+        /* Wait for the next one */
+        w->size_sub = 0;
+        w->size_got = 0;
+        w->size_rle = 0;
+        w->pts      = -1;
+    }
+
+    return HB_WORK_OK;
+}
+
+static hb_buffer_t * Decode( hb_work_object_t * w )
+{
+    int code, line, col;
+    int offsets[2];
+    int * offset;
+    hb_buffer_t * buf;
+    uint8_t * buf_raw = NULL;
+
+    /* Get infos about the subtitle */
+    ParseControls( w );
+
+    /* Do the actual decoding now */
+    buf_raw = malloc( w->width * w->height * 2 );
+
+#define GET_NEXT_NIBBLE code = ( code << 4 ) | ( ( ( *offset & 1 ) ? \
+( w->buf[((*offset)>>1)] & 0xF ) : ( w->buf[((*offset)>>1)] >> 4 ) ) ); \
+(*offset)++
+    
+    offsets[0] = w->offsets[0] * 2;
+    offsets[1] = w->offsets[1] * 2;
+
+    for( line = 0; line < w->height; line++ )
+    {
+        /* Select even or odd field */
+        offset = ( line & 1 ) ? &offsets[1] : &offsets[0];
+
+        for( col = 0; col < w->width; col += code >> 2 )
+        {
+            uint8_t * lum, * alpha;
+
+            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 |= ( w->width - col ) << 2;
+                        }
+                    }
+                }
+            }
+
+            lum   = buf_raw;
+            alpha = lum + w->width * w->height;
+            memset( lum + line * w->width + col,
+                    w->lum[code & 3], code >> 2 );
+            memset( alpha + line * w->width + col,
+                    w->alpha[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;
+}
+
+/***********************************************************************
+ * 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_job_t * job = w->job;
+    hb_title_t * title = job->title;
+
+    int i;
+    int command;
+    int date, next;
+
+    for( i = w->size_rle; ; )
+    {
+        date = ( w->buf[i] << 8 ) | w->buf[i+1]; i += 2;
+        next = ( w->buf[i] << 8 ) | w->buf[i+1]; i += 2;
+
+        for( ;; )
+        {
+            command = w->buf[i++];
+
+            if( command == 0xFF )
+            {
+                break;
+            }
+
+            switch( command )
+            {
+                case 0x00:
+                    break;
+
+                case 0x01:
+                    w->pts_start = w->pts + date * 900;
+                    break;
+
+                case 0x02:
+                    w->pts_stop = w->pts + date * 900;
+                    break;
+
+                case 0x03:
+                {
+                    int colors[4];
+                    int j;
+
+                    colors[0] = (w->buf[i+0]>>4)&0x0f;
+                    colors[1] = (w->buf[i+0])&0x0f;
+                    colors[2] = (w->buf[i+1]>>4)&0x0f;
+                    colors[3] = (w->buf[i+1])&0x0f;
+
+                    for( j = 0; j < 4; j++ )
+                    {
+                        uint32_t color = title->palette[colors[j]];
+                        w->lum[3-j] = (color>>16) & 0xff;
+                    }
+                    i += 2;
+                    break;
+                }
+                case 0x04:
+                {
+                    w->alpha[3] = (w->buf[i+0]>>4)&0x0f;
+                    w->alpha[2] = (w->buf[i+0])&0x0f;
+                    w->alpha[1] = (w->buf[i+1]>>4)&0x0f;
+                    w->alpha[0] = (w->buf[i+1])&0x0f;
+                    i += 2;
+                    break;
+                }
+                case 0x05:
+                {
+                    w->x     = (w->buf[i+0]<<4) | ((w->buf[i+1]>>4)&0x0f);
+                    w->width = (((w->buf[i+1]&0x0f)<<8)| w->buf[i+2]) - w->x + 1;
+                    w->y     = (w->buf[i+3]<<4)| ((w->buf[i+4]>>4)&0x0f);
+                    w->height = (((w->buf[i+4]&0x0f)<<8)| w->buf[i+5]) - w->y + 1;
+                    i += 6;
+                    break;
+                }
+                case 0x06:
+                {
+                    w->offsets[0] = ( w->buf[i] << 8 ) | w->buf[i+1]; i += 2;
+                    w->offsets[1] = ( w->buf[i] << 8 ) | w->buf[i+1]; i += 2;
+                    break;
+                }
+            }
+        }
+
+        if( i > next )
+        {
+            break;
+        }
+        i = next;
+    }
+}
+
+/***********************************************************************
+ * 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 )
+{
+    int i;
+    for( i = 0; i < w->width; i++ )
+    {
+        if( p[i] )
+        {
+            return 0;
+        }
+    }
+    return 1;
+}
+static int ColumnIsTransparent( hb_work_object_t * w, uint8_t * p )
+{
+    int i;
+    for( i = 0; i < w->height; i++ )
+    {
+        if( p[i*w->width] )
+        {
+            return 0;
+        }
+    }
+    return 1;
+}
+static hb_buffer_t * CropSubtitle( hb_work_object_t * w, uint8_t * raw )
+{
+    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;
+
+    alpha = raw + w->width * w->height;
+
+    /* Top */
+    for( i = 0; i < w->height; i++ )
+    {
+        if( !LineIsTransparent( w, &alpha[i*w->width] ) )
+        {
+            crop[0] = i;
+            break;
+        }
+    }
+
+    if( crop[0] < 0 )
+    {
+        /* Empty subtitle */
+        return NULL;
+    }
+
+    /* Bottom */
+    for( i = w->height - 1; i >= 0; i-- )
+    {
+        if( !LineIsTransparent( w, &alpha[i*w->width] ) )
+        {
+            crop[1] = i;
+            break;
+        }
+    }
+
+    /* Left */
+    for( i = 0; i < w->width; i++ )
+    {
+        if( !ColumnIsTransparent( w, &alpha[i] ) )
+        {
+            crop[2] = i;
+            break;
+        }
+    }
+
+    /* Right */
+    for( i = w->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 * 2 );
+    buf->start  = w->pts_start;
+    buf->stop   = w->pts_stop;
+    buf->x      = w->x + crop[2];
+    buf->y      = w->y + crop[0];
+    buf->width  = realwidth;
+    buf->height = realheight;
+
+    lum_in    = raw + crop[0] * w->width + crop[2];
+    alpha_in  = lum_in + w->width * w->height;
+    lum_out   = buf->data;
+    alpha_out = lum_out + realwidth * realheight;
+
+    for( i = 0; i < realheight; i++ )
+    {
+        memcpy( lum_out, lum_in, realwidth );
+        memcpy( alpha_out, alpha_in, realwidth );
+        lum_in    += w->width;
+        alpha_in  += w->width;
+        lum_out   += realwidth;
+        alpha_out += realwidth;
+    }
+
+    return buf;
+}