libhb/render.c

   1 /* $Id: render.c,v 1.17 2005/04/14 17:37:54 titer Exp $
   2
   3    This file is part of the HandBrake source code.
   4    Homepage: <http://handbrake.m0k.org/>.
   5    It may be used under the terms of the GNU General Public License. */
   6
   7 #include "hb.h"
   8
   9 #include "ffmpeg/avcodec.h"
  10
  11 struct hb_work_private_s
  12 {
  13     hb_job_t * job;
  14
  15     ImgReSampleContext * context;
  16     AVPicture            pic_raw;
  17     AVPicture            pic_deint;
  18     AVPicture            pic_render;
  19     hb_buffer_t        * buf_deint;
  20 };
  21
  22 int  renderInit( hb_work_object_t *, hb_job_t * );
  23 int  renderWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
  24 void renderClose( hb_work_object_t * );
  25
  26 hb_work_object_t hb_render =
  27 {
  28     WORK_RENDER,
  29     "Renderer",
  30     renderInit,
  31     renderWork,
  32     renderClose
  33 };
  34
  35 static void ApplySub( hb_job_t * job, hb_buffer_t * buf,
  36                       hb_buffer_t ** _sub )
  37 {
  38     hb_buffer_t * sub = *_sub;
  39     hb_title_t * title = job->title;
  40     int i, j, offset_top, offset_left;
  41     uint8_t * lum, * alpha, * out;
  42
  43     if( !sub )
  44     {
  45         return;
  46     }
  47
  48     /* If necessary, move the subtitle so it is not in a cropped zone.
  49        When it won't fit, we center it so we loose as much on both ends.
  50        Otherwise we try to leave a 20px margin around it. */
  51
  52     if( sub->height > title->height - job->crop[0] - job->crop[1] - 40 )
  53         offset_top = job->crop[0] + ( title->height - job->crop[0] -
  54                 job->crop[1] - sub->height ) / 2;
  55     else if( sub->y < job->crop[0] + 20 )
  56         offset_top = job->crop[0] + 20;
  57     else if( sub->y > title->height - job->crop[1] - 20 - sub->height )
  58         offset_top = title->height - job->crop[1] - 20 - sub->height;
  59     else
  60         offset_top = sub->y;
  61
  62     if( sub->width > title->width - job->crop[2] - job->crop[3] - 40 )
  63         offset_left = job->crop[2] + ( title->width - job->crop[2] -
  64                 job->crop[3] - sub->width ) / 2;
  65     else if( sub->x < job->crop[2] + 20 )
  66         offset_left = job->crop[2] + 20;
  67     else if( sub->x > title->width - job->crop[3] - 20 - sub->width )
  68         offset_left = title->width - job->crop[3] - 20 - sub->width;
  69     else
  70         offset_left = sub->x;
  71
  72     lum   = sub->data;
  73     alpha = lum + sub->width * sub->height;
  74     out   = buf->data + offset_top * title->width + offset_left;
  75
  76     for( i = 0; i < sub->height; i++ )
  77     {
  78         if( offset_top + i >= 0 && offset_top + i < title->height )
  79         {
  80             for( j = 0; j < sub->width; j++ )
  81             {
  82                 if( offset_left + j >= 0 && offset_left + j < title->width )
  83                 {
  84                     out[j] = ( (uint16_t) out[j] * ( 16 - (uint16_t) alpha[j] ) +
  85                                (uint16_t) lum[j] * (uint16_t) alpha[j] ) >> 4;
  86                 }
  87             }
  88         }
  89
  90         lum   += sub->width;
  91         alpha += sub->width;
  92         out   += title->width;
  93     }
  94
  95     hb_buffer_close( _sub );
  96 }
  97
  98 int renderWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
  99                 hb_buffer_t ** buf_out )
 100 {
 101     hb_work_private_t * pv = w->private_data;
 102     hb_job_t   * job   = pv->job;
 103     hb_title_t * title = job->title;
 104     hb_buffer_t * in = *buf_in, * buf;
 105
 106     avpicture_fill( &pv->pic_raw, in->data, PIX_FMT_YUV420P,
 107                     title->width, title->height );
 108
 109     buf        = hb_buffer_init( 3 * job->width * job->height / 2 );
 110     buf->start = in->start;
 111     buf->stop  = in->stop;
 112
 113     if( job->deinterlace && pv->context )
 114     {
 115         avpicture_fill( &pv->pic_render, buf->data, PIX_FMT_YUV420P,
 116                         job->width, job->height );
 117         avpicture_deinterlace( &pv->pic_deint, &pv->pic_raw,
 118                                PIX_FMT_YUV420P, title->width,
 119                                title->height );
 120         ApplySub( job, pv->buf_deint, &in->sub );
 121         img_resample( pv->context, &pv->pic_render, &pv->pic_deint );
 122     }
 123     else if( job->deinterlace )
 124     {
 125         avpicture_fill( &pv->pic_deint, buf->data, PIX_FMT_YUV420P,
 126                         job->width, job->height );
 127         avpicture_deinterlace( &pv->pic_deint, &pv->pic_raw,
 128                                PIX_FMT_YUV420P, title->width,
 129                                title->height );
 130         ApplySub( job, buf, &in->sub );
 131     }
 132     else if( pv->context )
 133     {
 134         ApplySub( job, in, &in->sub );
 135         avpicture_fill( &pv->pic_render, buf->data, PIX_FMT_YUV420P,
 136                         job->width, job->height );
 137         img_resample( pv->context, &pv->pic_render, &pv->pic_raw );
 138     }
 139     else
 140     {
 141         hb_buffer_close( &buf );
 142         ApplySub( job, in, &in->sub );
 143         buf      = in;
 144         *buf_in  = NULL;
 145     }
 146
 147     (*buf_out) = buf;
 148
 149     return HB_WORK_OK;
 150 }
 151
 152 void renderClose( hb_work_object_t * w )
 153 {
 154     hb_work_private_t * pv = w->private_data;
 155
 156     free( pv );
 157     w->private_data = NULL;
 158 }
 159
 160 int renderInit( hb_work_object_t * w, hb_job_t * job )
 161 {
 162     hb_title_t * title;
 163
 164     hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
 165     w->private_data = pv;
 166
 167     title = job->title;
 168
 169     pv->job = job;
 170
 171     if( job->crop[0] || job->crop[1] || job->crop[2] || job->crop[3] ||
 172         job->width != title->width || job->height != title->height )
 173     {
 174         pv->context = img_resample_full_init(
 175             job->width, job->height, title->width, title->height,
 176             job->crop[0], job->crop[1], job->crop[2], job->crop[3],
 177             0, 0, 0, 0 );
 178     }
 179
 180     if( job->deinterlace )
 181     {
 182         /* Allocate a constant buffer used for deinterlacing */
 183         pv->buf_deint = hb_buffer_init( 3 * title->width *
 184                                        title->height / 2 );
 185         avpicture_fill( &pv->pic_deint, pv->buf_deint->data,
 186                         PIX_FMT_YUV420P, title->width, title->height );
 187     }
 188
 189     return 0;
 190 }