/***********************************************************************
* DecodePreviews
***********************************************************************
* Decode 10 pictures for the given title.
* It assumes that data->reader and data->vts have successfully been
* DVDOpen()ed and ifoOpen()ed.
**********************************************************************/
static int DecodePreviews( hb_scan_t * data, hb_title_t * title, int flush )
{
int i, npreviews = 0, abort = 0;
hb_buffer_t * buf, * buf_es;
hb_buffer_list_t list_es;
int progressive_count = 0;
int pulldown_count = 0;
int doubled_frame_count = 0;
int interlaced_preview_count = 0;
int vid_samples = 0;
int frame_wait = 0;
int cc_wait = 10;
int frames;
hb_stream_t * stream = NULL;
info_list_t * info_list;
int abort_audio = 0;
info_list = calloc(data->preview_count+1, sizeof(*info_list));
crop_record_t *crops = crop_record_init( data->preview_count );
hb_buffer_list_clear(&list_es);
if( data->batch )
{
hb_log( "scan: decoding previews for title %d (%s)", title->index, title->path );
}
else
{
hb_log( "scan: decoding previews for title %d", title->index );
}
if (data->bd)
{
hb_bd_start( data->bd, title );
hb_log( "scan: title angle(s) %d", title->angle_count );
}
else if (data->dvd)
{
hb_dvd_start( data->dvd, title, 1 );
title->angle_count = hb_dvd_angle_count( data->dvd );
hb_log( "scan: title angle(s) %d", title->angle_count );
}
else if (data->batch)
{
stream = hb_stream_open(data->h, title->path, title, 0);
}
else if (data->stream)
{
stream = hb_stream_open(data->h, data->path, title, 0);
}
if (title->video_codec == WORK_NONE)
{
hb_error("No video decoder set!");
free(info_list);
crop_record_free(crops);
hb_stream_close(&stream);
return 0;
}
hb_work_object_t *vid_decoder = hb_get_work(data->h, title->video_codec);
vid_decoder->codec_param = title->video_codec_param;
vid_decoder->title = title;
if (vid_decoder->init(vid_decoder, NULL))
{
hb_error("Decoder init failed!");
free(info_list);
crop_record_free(crops);
free( vid_decoder );
hb_stream_close(&stream);
return 0;
}
for( i = 0; i < data->preview_count; i++ )
{
int j;
UpdateState3(data, i + 1);
if ( *data->die )
{
free( info_list );
crop_record_free( crops );
vid_decoder->close( vid_decoder );
free( vid_decoder );
hb_stream_close(&stream);
return 0;
}
if (data->bd)
{
if( !hb_bd_seek( data->bd, (float) ( i + 1 ) / ( data->preview_count + 1.0 ) ) )
{
continue;
}
}
if (data->dvd)
{
if( !hb_dvd_seek( data->dvd, (float) ( i + 1 ) / ( data->preview_count + 1.0 ) ) )
{
continue;
}
}
else if (stream)
{
/* we start reading streams at zero rather than 1/11 because
* short streams may have only one sequence header in the entire
* file and we need it to decode any previews.
*
* Also, seeking to position 0 loses the palette of avi files
* so skip initial seek */
if (i != 0)
{
if (!hb_stream_seek(stream,
(float)i / (data->preview_count + 1.0)))
{
continue;
}
}
else
{
hb_stream_set_need_keyframe(stream, 1);
}
}
hb_deep_log( 2, "scan: preview %d", i + 1 );
if (flush && vid_decoder->flush)
vid_decoder->flush( vid_decoder );
if (title->flags & HBTF_NO_IDR)
{
if (!flush)
{
// If we are doing the first previews decode attempt,
// set this threshold high so that we get the best
// quality frames possible.
frame_wait = 100;
}
else
{
// If we failed to get enough valid frames in the first
// previews decode attempt, lower the threshold to improve
// our chances of getting something to work with.
frame_wait = 10;
}
}
else
{
// For certain mpeg-2 streams, libav is delivering a
// dummy first frame that is all black. So always skip
// one frame
frame_wait = 1;
}
frames = 0;
hb_buffer_t * vid_buf = NULL, * last_vid_buf = NULL;
int packets = 0;
vid_decoder->frame_count = 0;
while (vid_decoder->frame_count < PREVIEW_READ_THRESH ||
(!AllAudioOK(title) && packets < 10000))
{
if ((buf = read_buf(data, stream)) == NULL)
{
// If we reach EOF and no audio, don't continue looking for
// audio
abort_audio = 1;
if (vid_buf != NULL || last_vid_buf != NULL)
{
break;
}
hb_log("Warning: Could not read data for preview %d, skipped",
i + 1 );
// If we reach EOF and no video, don't continue looking for
// video
abort = 1;
goto skip_preview;
}
packets++;
if (buf->size <= 0)
{
// Ignore "null" frames
hb_buffer_close(&buf);
continue;
}
(hb_demux[title->demuxer])(buf, &list_es, 0 );
while ((buf_es = hb_buffer_list_rem_head(&list_es)) != NULL)
{
if( buf_es->s.id == title->video_id && vid_buf == NULL )
{
vid_decoder->work( vid_decoder, &buf_es, &vid_buf );
// There are 2 conditions we decode additional
// video frames for during scan.
// 1. We did not detect IDR frames, so the initial video
// frames may be corrupt. We docode extra frames to
// increase the probability of a complete preview frame
// 2. Some frames do not contain CC data, even though
// CCs are present in the stream. So we need to decode
// additional frames to find the CCs.
if (vid_buf != NULL && (frame_wait || cc_wait))
{
hb_work_info_t vid_info;
if (vid_decoder->info(vid_decoder, &vid_info))
{
if (is_close_to(vid_info.rate.den, 900900, 100) &&
(vid_buf->s.flags & PIC_FLAG_REPEAT_FIRST_FIELD))
{
/* Potentially soft telecine material */
pulldown_count++;
}
if (vid_buf->s.flags & PIC_FLAG_REPEAT_FRAME)
{
// AVCHD-Lite specifies that all streams are
// 50 or 60 fps. To produce 25 or 30 fps, camera
// makers are repeating all frames.
doubled_frame_count++;
}
if (is_close_to(vid_info.rate.den, 1126125, 100 ))
{
// Frame FPS is 23.976 (meaning it's
// progressive), so start keeping track of
// how many are reporting at that speed. When
// enough show up that way, we want to make
// that the overall title FPS.
progressive_count++;
}
vid_samples++;
}
if (frames > 0 && vid_buf->s.frametype == HB_FRAME_I)
frame_wait = 0;
if (frame_wait || cc_wait)
{
hb_buffer_close(&last_vid_buf);
last_vid_buf = vid_buf;
vid_buf = NULL;
if (frame_wait) frame_wait--;
if (cc_wait) cc_wait--;
}
frames++;
}
}
else if (!AllAudioOK(title) && !abort_audio)
{
LookForAudio( data, title, buf_es );
buf_es = NULL;
}
if ( buf_es )
hb_buffer_close( &buf_es );
}
if (vid_buf && (abort_audio || AllAudioOK(title)))
break;
}
hb_buffer_list_close(&list_es);
if (vid_buf == NULL)
{
vid_buf = last_vid_buf;
last_vid_buf = NULL;
}
hb_buffer_close(&last_vid_buf);
if (vid_buf == NULL)
{
hb_log( "scan: could not get a decoded picture" );
continue;
}
/* Get size and rate infos */
hb_work_info_t 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.
*/
hb_log( "scan: could not get a video information" );
hb_buffer_close( &vid_buf );
continue;
}
if (vid_info.geometry.width != vid_buf->f.width ||
vid_info.geometry.height != vid_buf->f.height)
{
hb_log( "scan: video geometry information does not match buffer" );
hb_buffer_close( &vid_buf );
continue;
}
remember_info( info_list, &vid_info );
/* Check preview for interlacing artifacts */
if( hb_detect_comb( vid_buf, 10, 30, 9, 10, 30, 9 ) )
{
hb_deep_log( 2, "Interlacing detected in preview frame %i", i+1);
interlaced_preview_count++;
}
if( data->store_previews )
{
hb_save_preview( data->h, title->index, i, vid_buf );
}
/* Detect black borders */
int top, bottom, left, right;
int h4 = vid_info.geometry.height / 4, w4 = vid_info.geometry.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 = vid_info.geometry.height / 100;
for ( top = border; top < h4; ++top )
{
if ( ! row_all_dark( vid_buf, top ) )
break;
}
if ( top <= border )
{
// 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( vid_buf, top ) )
break;
}
if ( top >= border )
{
top = 0;
}
}
for ( bottom = border; bottom < h4; ++bottom )
{
if ( ! row_all_dark( vid_buf, vid_info.geometry.height - 1 - bottom ) )
break;
}
if ( bottom <= border )
{
for ( bottom = 0; bottom < border; ++bottom )
{
if ( ! row_all_dark( vid_buf, vid_info.geometry.height - 1 - bottom ) )
break;
}
if ( bottom >= border )
{
bottom = 0;
}
}
for ( left = 0; left < w4; ++left )
{
if ( ! column_all_dark( vid_buf, top, bottom, left ) )
break;
}
for ( right = 0; right < w4; ++right )
{
if ( ! column_all_dark( vid_buf, top, bottom, vid_info.geometry.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;
skip_preview:
/* Make sure we found audio rates and bitrates */
for( j = 0; j < hb_list_count( title->list_audio ); j++ )
{
hb_audio_t * audio = hb_list_item( title->list_audio, j );
if ( audio->priv.scan_cache )
{
hb_fifo_flush( audio->priv.scan_cache );
}
}
if (vid_buf)
{
hb_buffer_close( &vid_buf );
}
if (abort)
{
break;
}
}
UpdateState3(data, i);
vid_decoder->close( vid_decoder );
free( vid_decoder );
if (stream != NULL)
{
hb_stream_close(&stream);
}
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->has_resolution_change = has_resolution_change( info_list );
if ( title->video_codec_name == NULL )
{
title->video_codec_name = strdup( vid_info.name );
}
title->geometry.width = vid_info.geometry.width;
title->geometry.height = vid_info.geometry.height;
if (vid_info.rate.num && vid_info.rate.den)
{
// if the frame rate is very close to one of our "common"
// framerates, assume it actually is said frame rate;
// e.g. some 24000/1001 sources may have a rate.den of 1126124
// instead of 1126125
const hb_rate_t *video_framerate = NULL;
while ((video_framerate = hb_video_framerate_get_next(video_framerate)) != NULL)
{
if (is_close_to(vid_info.rate.den, video_framerate->rate, 100))
{
vid_info.rate.den = video_framerate->rate;
break;
}
}
title->vrate = vid_info.rate;
if( vid_info.rate.den == 900900 )
{
if (vid_samples >= 4 && pulldown_count >= vid_samples / 4)
{
title->vrate.den = 1126125;
hb_deep_log( 2, "Pulldown detected, setting fps to 23.976" );
}
if (vid_samples >= 2 && progressive_count >= vid_samples / 2)
{
// We've already deduced that the frame rate is 23.976,
// so set it back again.
title->vrate.den = 1126125;
hb_deep_log( 2, "Title's mostly NTSC Film, setting fps to 23.976" );
}
}
if (vid_samples >= 2 && doubled_frame_count >= 3 * vid_samples / 4)
{
// We've detected that a significant number of the frames
// have been doubled in duration by repeat flags.
title->vrate.den = 2 * vid_info.rate.den;
hb_deep_log(2, "Repeat frames detected, setting fps to %.3f",
(float)title->vrate.num / title->vrate.den );
}
}
title->video_bitrate = vid_info.bitrate;
if( vid_info.geometry.par.num && vid_info.geometry.par.den )
{
title->geometry.par = vid_info.geometry.par;
}
title->color_prim = vid_info.color_prim;
title->color_transfer = vid_info.color_transfer;
title->color_matrix = vid_info.color_matrix;
title->video_decode_support = vid_info.video_decode_support;
// compute the aspect ratio based on the storage dimensions and PAR.
hb_reduce(&title->dar.num, &title->dar.den,
title->geometry.par.num * title->geometry.width,
title->geometry.height * title->geometry.par.den);
// 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 (data->dvd &&
(title->dar.num != title->container_dar.num ||
title->dar.den != title->container_dar.den))
{
hb_log("scan: content PAR gives wrong aspect %d:%d; "
"using container aspect %d:%d",
title->dar.num, title->dar.den,
title->container_dar.num, title->container_dar.den);
title->dar = title->container_dar;
hb_reduce(&title->geometry.par.num, &title->geometry.par.den,
title->geometry.height * title->dar.num,
title->geometry.width * title->dar.den);
}
// 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] );
}
hb_log( "scan: %d previews, %dx%d, %.3f fps, autocrop = %d/%d/%d/%d, "
"aspect %s, PAR %d:%d",
npreviews, title->geometry.width, title->geometry.height,
(float)title->vrate.num / title->vrate.den,
title->crop[0], title->crop[1], title->crop[2], title->crop[3],
aspect_to_string(&title->dar),
title->geometry.par.num, title->geometry.par.den);
if (title->video_decode_support != HB_DECODE_SUPPORT_SW)
{
hb_log("scan: supported video decoders:%s%s",
!(title->video_decode_support & HB_DECODE_SUPPORT_SW) ? "" : " avcodec",
!(title->video_decode_support & HB_DECODE_SUPPORT_QSV) ? "" : " qsv");
}
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;
}
}
/***********************************************************************
* DecodePreviews
***********************************************************************
* Decode 10 pictures for the given title.
* It assumes that data->reader and data->vts have successfully been
* DVDOpen()ed and ifoOpen()ed.
**********************************************************************/
static int DecodePreviews( hb_scan_t * data, hb_title_t * title )
{
int i, npreviews = 0;
hb_buffer_t * buf, * buf_es;
hb_list_t * list_es;
int progressive_count = 0;
int pulldown_count = 0;
int doubled_frame_count = 0;
int interlaced_preview_count = 0;
info_list_t * info_list = calloc( data->preview_count+1, sizeof(*info_list) );
crop_record_t *crops = crop_record_init( data->preview_count );
list_es = hb_list_init();
if( data->batch )
{
hb_log( "scan: decoding previews for title %d (%s)", title->index, title->path );
}
else
{
hb_log( "scan: decoding previews for title %d", title->index );
}
if (data->bd)
{
hb_bd_start( data->bd, title );
hb_log( "scan: title angle(s) %d", title->angle_count );
}
else if (data->dvd)
{
hb_dvd_start( data->dvd, title, 1 );
title->angle_count = hb_dvd_angle_count( data->dvd );
hb_log( "scan: title angle(s) %d", title->angle_count );
}
else if (data->batch)
{
data->stream = hb_stream_open( title->path, title, 1 );
}
int vcodec = title->video_codec? title->video_codec : WORK_DECMPEG2;
#if defined(USE_FF_MPEG2)
if (vcodec == WORK_DECMPEG2)
{
vcodec = WORK_DECAVCODECV;
title->video_codec_param = CODEC_ID_MPEG2VIDEO;
}
#endif
hb_work_object_t *vid_decoder = hb_get_work( vcodec );
vid_decoder->codec_param = title->video_codec_param;
vid_decoder->title = title;
vid_decoder->init( vid_decoder, NULL );
for( i = 0; i < data->preview_count; i++ )
{
int j;
if ( *data->die )
{
free( info_list );
crop_record_free( crops );
return 0;
}
if (data->bd)
{
if( !hb_bd_seek( data->bd, (float) ( i + 1 ) / ( data->preview_count + 1.0 ) ) )
{
continue;
}
}
if (data->dvd)
{
if( !hb_dvd_seek( data->dvd, (float) ( i + 1 ) / ( data->preview_count + 1.0 ) ) )
{
continue;
}
}
else if (data->stream)
{
/* we start reading streams at zero rather than 1/11 because
* short streams may have only one sequence header in the entire
* file and we need it to decode any previews. */
if (!hb_stream_seek(data->stream, (float) i / ( data->preview_count + 1.0 ) ) )
{
continue;
}
}
hb_deep_log( 2, "scan: preview %d", i + 1 );
if ( vid_decoder->flush )
vid_decoder->flush( vid_decoder );
hb_buffer_t * vid_buf = NULL;
for( j = 0; j < 10240 ; j++ )
{
if (data->bd)
{
if( (buf = hb_bd_read( data->bd )) == NULL )
{
if ( vid_buf )
{
break;
}
hb_log( "Warning: Could not read data for preview %d, skipped", i + 1 );
goto skip_preview;
}
}
else if (data->dvd)
{
if( (buf = hb_dvd_read( data->dvd )) == NULL )
{
if ( vid_buf )
{
break;
}
hb_log( "Warning: Could not read data for preview %d, skipped", i + 1 );
goto skip_preview;
}
}
else if (data->stream)
{
if ( (buf = hb_stream_read( data->stream )) == NULL )
{
if ( vid_buf )
{
break;
}
hb_log( "Warning: Could not read data for preview %d, skipped", i + 1 );
goto skip_preview;
}
}
else
{
// Silence compiler warning
buf = NULL;
hb_error( "Error: This can't happen!" );
goto skip_preview;
}
(hb_demux[title->demuxer])(buf, list_es, 0 );
while( ( buf_es = hb_list_item( list_es, 0 ) ) )
{
hb_list_rem( list_es, buf_es );
if( buf_es->s.id == title->video_id && vid_buf == NULL )
{
vid_decoder->work( vid_decoder, &buf_es, &vid_buf );
}
else if( ! AllAudioOK( title ) )
{
LookForAudio( title, buf_es );
buf_es = NULL;
}
if ( buf_es )
hb_buffer_close( &buf_es );
}
if( vid_buf && AllAudioOK( title ) )
break;
}
if( ! vid_buf )
{
hb_log( "scan: could not get a decoded picture" );
continue;
}
/* Get size and rate infos */
hb_work_info_t 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.
*/
if (vid_buf)
{
hb_buffer_close( &vid_buf );
}
hb_log( "scan: could not get a video information" );
continue;
}
remember_info( info_list, &vid_info );
if( is_close_to( vid_info.rate_base, 900900, 100 ) &&
( vid_buf->s.flags & PIC_FLAG_REPEAT_FIRST_FIELD ) )
{
/* Potentially soft telecine material */
pulldown_count++;
}
if( vid_buf->s.flags & PIC_FLAG_REPEAT_FRAME )
{
// AVCHD-Lite specifies that all streams are
// 50 or 60 fps. To produce 25 or 30 fps, camera
// makers are repeating all frames.
doubled_frame_count++;
}
if( is_close_to( vid_info.rate_base, 1126125, 100 ) )
{
// Frame FPS is 23.976 (meaning it's progressive), so start keeping
// track of how many are reporting at that speed. When enough
// show up that way, we want to make that the overall title FPS.
progressive_count++;
}
while( ( buf_es = hb_list_item( list_es, 0 ) ) )
{
hb_list_rem( list_es, buf_es );
hb_buffer_close( &buf_es );
}
/* Check preview for interlacing artifacts */
if( hb_detect_comb( vid_buf, 10, 30, 9, 10, 30, 9 ) )
{
hb_deep_log( 2, "Interlacing detected in preview frame %i", i+1);
interlaced_preview_count++;
}
if( data->store_previews )
{
hb_save_preview( data->h, title->index, i, vid_buf );
}
/* Detect black borders */
int top, bottom, left, right;
int h4 = vid_info.height / 4, w4 = vid_info.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 = vid_info.height / 100;
for ( top = border; top < h4; ++top )
{
if ( ! row_all_dark( vid_buf, top ) )
break;
}
if ( top <= border )
{
// 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( vid_buf, top ) )
break;
}
if ( top >= border )
{
top = 0;
}
}
for ( bottom = border; bottom < h4; ++bottom )
{
if ( ! row_all_dark( vid_buf, vid_info.height - 1 - bottom ) )
break;
}
if ( bottom <= border )
{
for ( bottom = 0; bottom < border; ++bottom )
{
if ( ! row_all_dark( vid_buf, vid_info.height - 1 - bottom ) )
break;
}
if ( bottom >= border )
{
bottom = 0;
}
}
for ( left = 0; left < w4; ++left )
{
if ( ! column_all_dark( vid_buf, top, bottom, left ) )
break;
}
for ( right = 0; right < w4; ++right )
{
if ( ! column_all_dark( vid_buf, top, bottom, vid_info.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;
skip_preview:
/* Make sure we found audio rates and bitrates */
for( j = 0; j < hb_list_count( title->list_audio ); j++ )
{
hb_audio_t * audio = hb_list_item( title->list_audio, j );
if ( audio->priv.scan_cache )
{
hb_fifo_flush( audio->priv.scan_cache );
}
}
if (vid_buf)
{
hb_buffer_close( &vid_buf );
}
}
vid_decoder->close( vid_decoder );
free( vid_decoder );
if ( data->batch && data->stream )
{
hb_stream_close( &data->stream );
}
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->has_resolution_change = has_resolution_change( info_list );
if ( title->video_codec_name == NULL )
{
title->video_codec_name = strdup( vid_info.name );
}
title->width = vid_info.width;
title->height = vid_info.height;
if ( vid_info.rate && vid_info.rate_base )
{
// if the frame rate is very close to one of our "common" framerates,
// assume it actually is said frame rate; e.g. some 24000/1001 sources
// may have a rate_base of 1126124 (instead of 1126125)
for( i = 0; i < hb_video_rates_count; i++ )
{
if( is_close_to( vid_info.rate_base, hb_video_rates[i].rate, 100 ) )
{
vid_info.rate_base = hb_video_rates[i].rate;
break;
}
}
title->rate = vid_info.rate;
title->rate_base = vid_info.rate_base;
if( vid_info.rate_base == 900900 )
{
if( pulldown_count >= npreviews / 4 )
{
title->rate_base = 1126125;
hb_deep_log( 2, "Pulldown detected, setting fps to 23.976" );
}
if( progressive_count >= npreviews / 2 )
{
// We've already deduced that the frame rate is 23.976,
// so set it back again.
title->rate_base = 1126125;
hb_deep_log( 2, "Title's mostly NTSC Film, setting fps to 23.976" );
}
}
if( doubled_frame_count >= 3 * npreviews / 4 )
{
// We've detected that a significant number of the frames
// have been doubled in duration by repeat flags.
title->rate_base = 2 * vid_info.rate_base;
hb_deep_log( 2, "Repeat frames detected, setting fps to %.3f", (float)title->rate / title->rate_base );
}
}
title->video_bitrate = vid_info.bitrate;
if( vid_info.pixel_aspect_width && vid_info.pixel_aspect_height )
{
title->pixel_aspect_width = vid_info.pixel_aspect_width;
title->pixel_aspect_height = vid_info.pixel_aspect_height;
}
title->color_prim = vid_info.color_prim;
title->color_transfer = vid_info.color_transfer;
title->color_matrix = vid_info.color_matrix;
// 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;
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 && (int)(title->aspect * 9) != (int)(title->container_aspect * 9) )
{
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 + 0.5), title->width );
}
// 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] );
}
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;
}
}