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<?php |
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declare(strict_types=1); |
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namespace Soluble\MediaTools\Video\Detection; |
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use Soluble\MediaTools\Video\Filter\EmptyVideoFilter; |
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use Soluble\MediaTools\Video\Filter\VideoFilterInterface; |
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use Soluble\MediaTools\Video\Filter\YadifVideoFilter; |
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class InterlaceDetectGuess |
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{ |
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/** |
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* Default interlacing detection threshold |
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* 20% frames detected interlaced is a sufficient |
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* threshold to detect interlacing. |
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*/ |
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public const DEFAULT_DETECTION_THRESHOLD = 0.2; |
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public const MODE_INTERLACED_BFF = 'INTERLACED_BFF'; |
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public const MODE_INTERLACED_TFF = 'INTERLACED_TFF'; |
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public const MODE_PROGRESSIVE = 'PROGRESSIVE'; |
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public const MODE_UNDETERMINED = 'UNDETERMINED'; |
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/** @var float */ |
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protected $detection_threshold; |
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/** @var int */ |
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protected $total_frames; |
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/** @var array<string, int> */ |
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protected $detected_frames; |
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/** @var array<string, float> */ |
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protected $percent_frames; |
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/** |
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* @param float $detection_threshold in percent: i.e 0.8, 0.6... |
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*/ |
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public function __construct( |
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int $nb_frames_interlaced_tff, |
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int $nb_frames_interlaced_bff, |
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int $nb_frames_progressive, |
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int $nb_frames_undetermined, |
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float $detection_threshold = self::DEFAULT_DETECTION_THRESHOLD |
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) { |
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$this->detection_threshold = $detection_threshold; |
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$detected_frames = [ |
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self::MODE_INTERLACED_TFF => $nb_frames_interlaced_tff, |
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self::MODE_INTERLACED_BFF => $nb_frames_interlaced_bff, |
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self::MODE_PROGRESSIVE => $nb_frames_progressive, |
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self::MODE_UNDETERMINED => $nb_frames_undetermined, |
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]; |
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arsort($detected_frames, SORT_NUMERIC); |
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$this->detected_frames = $detected_frames; |
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$this->total_frames = (int) array_sum(array_values($this->detected_frames)); |
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$this->percent_frames = []; |
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foreach ($this->detected_frames as $key => $value) { |
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$this->percent_frames[$key] = $value / $this->total_frames; |
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} |
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} |
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/** |
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* @return float[] |
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*/ |
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public function getStats(): array |
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{ |
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return $this->percent_frames; |
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} |
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public function getBestGuess(?float $threshold = null): string |
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{ |
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$min_pct = $threshold !== null ? $threshold : $this->detection_threshold; |
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reset($this->detected_frames); |
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$bestGuessKey = (string) key($this->detected_frames); |
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if ($this->percent_frames[$bestGuessKey] >= $min_pct) { |
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return $bestGuessKey; |
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} |
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return self::MODE_UNDETERMINED; |
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} |
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/** |
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* Whether the video seems to be interlaced in TFF (top field first) |
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* within a certain probability threshold. |
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* |
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* @param float|null $threshold |
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* |
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* @return bool |
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*/ |
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public function isInterlacedTff(?float $threshold = null): bool |
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{ |
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$min_pct = $threshold !== null ? $threshold : $this->detection_threshold; |
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return $this->percent_frames[self::MODE_INTERLACED_TFF] >= $min_pct; |
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} |
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/** |
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* Whether the video seems to be interlaced in BFF (bottom field first) |
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* within a certain probability threshold. |
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* |
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* @param float|null $threshold |
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* |
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* @return bool |
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*/ |
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public function isInterlacedBff(?float $threshold = null): bool |
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{ |
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$min_pct = $threshold !== null ? $threshold : $this->detection_threshold; |
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return $this->percent_frames[self::MODE_INTERLACED_BFF] >= $min_pct; |
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} |
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/** |
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* Whether the video seems to be interlaced either in BFF (bottom field first) |
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* or TFF (top field first) within a certain probability threshold. |
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* |
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* @param float|null $threshold |
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* |
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* @return bool |
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*/ |
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public function isInterlaced(?float $threshold = null): bool |
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{ |
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return $this->isInterlacedBff($threshold) || $this->isInterlacedTff($threshold); |
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} |
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public function isProgressive(?float $threshold = null): bool |
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{ |
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$min_pct = $threshold !== null ? $threshold : $this->detection_threshold; |
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return $this->percent_frames[self::MODE_PROGRESSIVE] >= $min_pct; |
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} |
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public function isUndetermined(?float $threshold = null): bool |
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{ |
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$min_pct = $threshold !== null ? $threshold : $this->detection_threshold; |
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return $this->percent_frames[self::MODE_UNDETERMINED] >= $min_pct; |
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} |
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/** |
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* @see https://ffmpeg.org/ffmpeg-filters.html (section yadif) |
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* @see https://askubuntu.com/a/867203 |
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* |
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* @param float|null $threshold |
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* |
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* @return EmptyVideoFilter|YadifVideoFilter |
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*/ |
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public function getDeinterlaceVideoFilter(?float $threshold = null): VideoFilterInterface |
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{ |
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if (!$this->isInterlaced($threshold)) { |
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return new EmptyVideoFilter(); |
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} |
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$parity = YadifVideoFilter::DEFAULT_PARITY; |
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if ($this->isInterlacedBff($threshold)) { |
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// parity=1, bff - Assume the bottom field is first. |
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$parity = 1; |
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} elseif ($this->isInterlacedTff($threshold)) { |
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// parity=0, tff - Assume the top field is first. |
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$parity = 0; |
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} |
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return new YadifVideoFilter(YadifVideoFilter::DEFAULT_MODE, $parity, YadifVideoFilter::DEFAULT_DEINT); |
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} |
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} |
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soluble-io /
soluble-mediatools
