static void LookForAudio( hb_title_t * title, hb_buffer_t * b );
static int AllAudioOK( hb_title_t * title );
+static const char *aspect_to_string( double aspect )
+{
+ switch ( (int)(aspect * 9.) )
+ {
+ case 9 * 4 / 3: return "4:3";
+ case 9 * 16 / 9: return "16:9";
+ }
+ static char arstr[32];
+ sprintf( arstr, aspect >= 1.? "%.2f:1" : "1:%.2f", aspect );
+ return arstr;
+}
+
hb_thread_t * hb_scan_init( hb_handle_t * handle, const char * path,
int title_index, hb_list_t * list_title )
{
/* Autocrop by default. Gnark gnark */
memcpy( job->crop, title->crop, 4 * sizeof( int ) );
- if( title->aspect == 16 && !job->pixel_aspect_width && !job->pixel_aspect_height)
+ /* Preserve a source's pixel aspect, if it's available. */
+ if( title->pixel_aspect_width && title->pixel_aspect_height )
{
- hb_reduce( &job->pixel_aspect_width, &job->pixel_aspect_height,
- 16 * title->height, 9 * title->width );
+ job->pixel_aspect_width = title->pixel_aspect_width;
+ job->pixel_aspect_height = title->pixel_aspect_height;
}
- else if( !job->pixel_aspect_width && !job->pixel_aspect_height )
+
+ if( title->aspect != 0 && title->aspect != 1. &&
+ !job->pixel_aspect_width && !job->pixel_aspect_height)
{
hb_reduce( &job->pixel_aspect_width, &job->pixel_aspect_height,
- 4 * title->height, 3 * title->width );
+ (int)(title->aspect * title->height), title->width );
}
job->width = title->width - job->crop[2] - job->crop[3];
_data = NULL;
}
+// -----------------------------------------------
+// stuff related to cropping
+
+#define DARK 32
+
+static inline int absdiff( int x, int y )
+{
+ return x < y ? y - x : x - y;
+}
+
+static inline int clampBlack( int x )
+{
+ // luma 'black' is 16 and anything less should be clamped at 16
+ return x < 16 ? 16 : x;
+}
+
+static int row_all_dark( hb_title_t *title, uint8_t* luma, int row )
+{
+ luma += title->width * row;
+
+ // compute the average luma value of the row
+ int i, avg = 0;
+ for ( i = 0; i < title->width; ++i )
+ {
+ avg += clampBlack( luma[i] );
+ }
+ avg /= title->width;
+ if ( avg >= DARK )
+ return 0;
+
+ // since we're trying to detect smooth borders, only take the row if
+ // all pixels are within +-16 of the average (this range is fairly coarse
+ // but there's a lot of quantization noise for luma values near black
+ // so anything less will fail to crop because of the noise).
+ for ( i = 0; i < title->width; ++i )
+ {
+ if ( absdiff( avg, clampBlack( luma[i] ) ) > 16 )
+ return 0;
+ }
+ return 1;
+}
+
+static int column_all_dark( hb_title_t *title, uint8_t* luma, int top, int bottom,
+ int col )
+{
+ int stride = title->width;
+ int height = title->height - top - bottom;
+ luma += stride * top + col;
+
+ // compute the average value of the column
+ int i = height, avg = 0, row = 0;
+ for ( ; --i >= 0; row += stride )
+ {
+ avg += clampBlack( luma[row] );
+ }
+ avg /= height;
+ if ( avg >= DARK )
+ return 0;
+
+ // since we're trying to detect smooth borders, only take the column if
+ // all pixels are within +-16 of the average.
+ i = height, row = 0;
+ for ( ; --i >= 0; row += stride )
+ {
+ if ( absdiff( avg, clampBlack( luma[row] ) ) > 16 )
+ return 0;
+ }
+ return 1;
+}
+#undef DARK
+
+typedef struct {
+ int n;
+ int t[10];
+ int b[10];
+ int l[10];
+ int r[10];
+} crop_record_t;
+
+static void record_crop( crop_record_t *crops, int t, int b, int l, int r )
+{
+ crops->t[crops->n] = t;
+ crops->b[crops->n] = b;
+ crops->l[crops->n] = l;
+ crops->r[crops->n] = r;
+ ++crops->n;
+}
+
+static int compare_int( const void *a, const void *b )
+{
+ return *(const int *)a - *(const int *)b;
+}
+
+static void sort_crops( crop_record_t *crops )
+{
+ qsort( crops->t, crops->n, sizeof(crops->t[0]), compare_int );
+ qsort( crops->b, crops->n, sizeof(crops->t[0]), compare_int );
+ qsort( crops->l, crops->n, sizeof(crops->t[0]), compare_int );
+ qsort( crops->r, crops->n, sizeof(crops->t[0]), compare_int );
+}
+
+// -----------------------------------------------
+// stuff related to title width/height/aspect info
+
+typedef struct {
+ int count; /* number of times we've seen this info entry */
+ hb_work_info_t info; /* copy of info entry */
+} info_list_t;
+
+static void remember_info( info_list_t *info_list, hb_work_info_t *info )
+{
+ for ( ; info_list->count; ++info_list )
+ {
+ if ( memcmp( &info_list->info, info, sizeof(*info) ) == 0 )
+ {
+ // we found a match - bump its count
+ ++info_list->count;
+ return;
+ }
+ }
+ // no match found - add new entry to list (info_list points to
+ // the first free slot). NB - we assume that info_list was allocated
+ // so that it's big enough even if there are no dups. I.e., 10 slots
+ // allocated if there are 10 previews.
+ info_list->count = 1;
+ info_list->info = *info;
+}
+
+static void most_common_info( info_list_t *info_list, hb_work_info_t *info )
+{
+ int i, biggest = 0;
+ for ( i = 1; info_list[i].count; ++i )
+ {
+ if ( info_list[i].count > info_list[biggest].count )
+ biggest = i;
+ }
+ *info = info_list[biggest].info;
+ free( info_list );
+}
+
/***********************************************************************
* DecodePreviews
***********************************************************************
hb_list_t * list_es;
int progressive_count = 0;
int interlaced_preview_count = 0;
- double last_ar = 0;
- int ar16_count = 0, ar4_count = 0;
+ info_list_t * info_list = calloc( 10+1, sizeof(*info_list) );
+ crop_record_t *crops = calloc( 1, sizeof(*crops) );
buf_ps = hb_buffer_init( HB_DVD_READ_BUFFER_SIZE );
list_es = hb_list_init();
for( i = 0; i < 10; i++ )
{
- int j, k;
+ int j;
FILE * file_preview;
char filename[1024];
/* Get size and rate infos */
hb_work_info_t vid_info;
- vid_decoder->info( vid_decoder, &vid_info );
+ if( !vid_decoder->info( vid_decoder, &vid_info ) )
+ {
+ /*
+ * Could not fill vid_info, don't continue and try to use vid_info
+ * in this case.
+ */
+ vid_decoder->close( vid_decoder );
+ free( vid_decoder );
+ continue;
+ }
vid_decoder->close( vid_decoder );
free( vid_decoder );
+ remember_info( info_list, &vid_info );
+
+ title->video_codec_name = strdup( vid_info.name );
title->width = vid_info.width;
title->height = vid_info.height;
title->rate = vid_info.rate;
title->rate_base = vid_info.rate_base;
- if ( vid_info.aspect != 0 )
- {
- if ( vid_info.aspect != last_ar && last_ar != 0 )
- {
- hb_log( "aspect ratio changed from %g to %g",
- last_ar, vid_info.aspect );
- }
- switch ( (int)vid_info.aspect )
- {
- case HB_ASPECT_BASE * 4 / 3:
- ++ar4_count;
- break;
- case HB_ASPECT_BASE * 16 / 9:
- ++ar16_count;
- break;
- default:
- hb_log( "unknown aspect ratio %g", vid_info.aspect );
- /* if the aspect is closer to 4:3 use that
- * otherwise use 16:9 */
- vid_info.aspect < HB_ASPECT_BASE * 14 / 9 ? ++ar4_count :
- ++ar16_count;
- break;
- }
- last_ar = vid_info.aspect;
- }
+ title->video_bitrate = vid_info.bitrate;
if( title->rate_base == 1126125 )
{
title->rate_base = 1126125;
}
- // start from third frame to skip opening logos
- if( i == 2)
- {
- title->crop[0] = title->crop[1] = title->height / 2;
- title->crop[2] = title->crop[3] = title->width / 2;
- }
-
while( ( buf_es = hb_list_item( list_es, 0 ) ) )
{
hb_list_rem( list_es, buf_es );
/* Check preview for interlacing artifacts */
if( hb_detect_comb( vid_buf, title->width, title->height, 10, 30, 9, 10, 30, 9 ) )
{
- hb_log("Interlacing detected in preview frame %i", i);
+ hb_log("Interlacing detected in preview frame %i", i+1);
interlaced_preview_count++;
}
hb_log( "scan: fopen failed (%s)", filename );
}
-#define Y vid_buf->data
-#define DARK 64
-
/* Detect black borders */
- for( j = 0; j < title->width; j++ )
+#define Y vid_buf->data
+ int top, bottom, left, right;
+ int h4 = title->height / 4, w4 = title->width / 4;
+
+ // When widescreen content is matted to 16:9 or 4:3 there's sometimes
+ // a thin border on the outer edge of the matte. On TV content it can be
+ // "line 21" VBI data that's normally hidden in the overscan. For HD
+ // content it can just be a diagnostic added in post production so that
+ // the frame borders are visible. We try to ignore these borders so
+ // we can crop the matte. The border width depends on the resolution
+ // (12 pixels on 1080i looks visually the same as 4 pixels on 480i)
+ // so we allow the border to be up to 1% of the frame height.
+ const int border = title->height / 100;
+
+ for ( top = border; top < h4; ++top )
{
- for( k = 2; k < title->crop[0]; k++ )
- if( Y[ k * title->width + j ] > DARK )
- {
- title->crop[0] = k;
- break;
- }
- for( k = 0; k < title->crop[1]; k++ )
- if( Y[ ( title->height - k - 1 ) *
- title->width + j ] > DARK )
- {
- title->crop[1] = k;
- break;
- }
+ if ( ! row_all_dark( title, Y, top ) )
+ break;
}
- for( j = 0; j < title->height; j++ )
+ if ( top <= border )
{
- for( k = 0; k < title->crop[2]; k++ )
- if( Y[ j * title->width + k ] > DARK )
- {
- title->crop[2] = k;
+ // we never made it past the border region - see if the rows we
+ // didn't check are dark or if we shouldn't crop at all.
+ for ( top = 0; top < border; ++top )
+ {
+ if ( ! row_all_dark( title, Y, top ) )
break;
- }
- for( k = 0; k < title->crop[3]; k++ )
- if( Y[ j * title->width +
- title->width - k - 1 ] > DARK )
- {
- title->crop[3] = k;
+ }
+ if ( top >= border )
+ {
+ top = 0;
+ }
+ }
+ for ( bottom = border; bottom < h4; ++bottom )
+ {
+ if ( ! row_all_dark( title, Y, title->height - 1 - bottom ) )
+ break;
+ }
+ if ( bottom <= border )
+ {
+ for ( bottom = 0; bottom < border; ++bottom )
+ {
+ if ( ! row_all_dark( title, Y, title->height - 1 - bottom ) )
break;
- }
+ }
+ if ( bottom >= border )
+ {
+ bottom = 0;
+ }
+ }
+ for ( left = 0; left < w4; ++left )
+ {
+ if ( ! column_all_dark( title, Y, top, bottom, left ) )
+ break;
+ }
+ for ( right = 0; right < w4; ++right )
+ {
+ if ( ! column_all_dark( title, Y, top, bottom, title->width - 1 - right ) )
+ break;
+ }
+
+ // only record the result if all the crops are less than a quarter of
+ // the frame otherwise we can get fooled by frames with a lot of black
+ // like titles, credits & fade-thru-black transitions.
+ if ( top < h4 && bottom < h4 && left < w4 && right < w4 )
+ {
+ record_crop( crops, top, bottom, left, right );
}
++npreviews;
hb_buffer_close( &vid_buf );
}
- /* if we found mostly 4:3 previews use that as the aspect ratio otherwise
- use 16:9 */
- title->aspect = ar4_count > ar16_count ?
- HB_ASPECT_BASE * 4 / 3 : HB_ASPECT_BASE * 16 / 9;
+ if ( npreviews )
+ {
+ // use the most common frame info for our final title dimensions
+ hb_work_info_t vid_info;
+ most_common_info( info_list, &vid_info );
- title->crop[0] = EVEN( title->crop[0] );
- title->crop[1] = EVEN( title->crop[1] );
- title->crop[2] = EVEN( title->crop[2] );
- title->crop[3] = EVEN( title->crop[3] );
+ title->width = vid_info.width;
+ title->height = vid_info.height;
+ title->pixel_aspect_width = vid_info.pixel_aspect_width;
+ title->pixel_aspect_height = vid_info.pixel_aspect_height;
- hb_log( "scan: %d previews, %dx%d, %.3f fps, autocrop = %d/%d/%d/%d, aspect %s",
- npreviews, title->width, title->height, (float) title->rate /
- (float) title->rate_base, title->crop[0], title->crop[1],
- title->crop[2], title->crop[3],
- title->aspect == HB_ASPECT_BASE * 16 / 9 ? "16:9" :
- title->aspect == HB_ASPECT_BASE * 4 / 3 ? "4:3" : "none" );
+ // compute the aspect ratio based on the storage dimensions and the
+ // pixel aspect ratio (if supplied) or just storage dimensions if no PAR.
+ title->aspect = (double)title->width / (double)title->height;
+ if( title->pixel_aspect_width && title->pixel_aspect_height )
+ {
+ title->aspect *= (double)title->pixel_aspect_width /
+ (double)title->pixel_aspect_height;
+
+ // For unknown reasons some French PAL DVDs put the original
+ // content's aspect ratio into the mpeg PAR even though it's
+ // the wrong PAR for the DVD. Apparently they rely on the fact
+ // that DVD players ignore the content PAR and just use the
+ // aspect ratio from the DVD metadata. So, if the aspect computed
+ // from the PAR is different from the container's aspect we use
+ // the container's aspect & recompute the PAR from it.
+ if( title->container_aspect && title->aspect != title->container_aspect )
+ {
+ hb_log("scan: content PAR gives wrong aspect %.2f; "
+ "using container aspect %.2f", title->aspect,
+ title->container_aspect );
+ title->aspect = title->container_aspect;
+ hb_reduce( &title->pixel_aspect_width, &title->pixel_aspect_height,
+ (int)(title->aspect * title->height), title->width );
+ }
+ }
- if( interlaced_preview_count >= ( npreviews / 2 ) )
- {
- hb_log("Title is likely interlaced or telecined (%i out of %i previews). You should do something about that.",
- interlaced_preview_count, npreviews);
- title->detected_interlacing = 1;
- }
- else
- {
- title->detected_interlacing = 0;
+ // don't try to crop unless we got at least 3 previews
+ if ( crops->n > 2 )
+ {
+ sort_crops( crops );
+ // The next line selects median cropping - at least
+ // 50% of the frames will have their borders removed.
+ // Other possible choices are loose cropping (i = 0) where
+ // no non-black pixels will be cropped from any frame and a
+ // tight cropping (i = crops->n - (crops->n >> 2)) where at
+ // least 75% of the frames will have their borders removed.
+ i = crops->n >> 1;
+ title->crop[0] = EVEN( crops->t[i] );
+ title->crop[1] = EVEN( crops->b[i] );
+ title->crop[2] = EVEN( crops->l[i] );
+ title->crop[3] = EVEN( crops->r[i] );
+ }
+ free( crops );
+
+ hb_log( "scan: %d previews, %dx%d, %.3f fps, autocrop = %d/%d/%d/%d, "
+ "aspect %s, PAR %d:%d",
+ npreviews, title->width, title->height, (float) title->rate /
+ (float) title->rate_base,
+ title->crop[0], title->crop[1], title->crop[2], title->crop[3],
+ aspect_to_string( title->aspect ), title->pixel_aspect_width,
+ title->pixel_aspect_height );
+
+ if( interlaced_preview_count >= ( npreviews / 2 ) )
+ {
+ hb_log("Title is likely interlaced or telecined (%i out of %i previews). You should do something about that.",
+ interlaced_preview_count, npreviews);
+ title->detected_interlacing = 1;
+ }
+ else
+ {
+ title->detected_interlacing = 0;
+ }
}
hb_buffer_close( &buf_ps );
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