encoding.py 4.35 KB
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from server import *
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import os.path
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def set_metadata(dest, course, lecture):
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	chapters = query('SELECT text, time FROM chapters WHERE lecture_id = ? AND visible ORDER BY time', lecture['id'])
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	metadata = {'title': lecture['title'], 'album': course['title'],
		'description': lecture['comment'],
		'date': lecture['time'].strftime('%m/%d/%Y'),
		'artist': lecture['speaker'] if lecture['speaker'] else course['organizer']}
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	dest['metadata'] = metadata
	dest['chapters'] = chapters

def schedule_remux(lectureid):
	lecture = query('SELECT * FROM lectures WHERE id = ?', lectureid)[0]
	course = query('SELECT * FROM courses WHERE id = ?', lecture['course_id'])[0]
	videos = query('''SELECT videos.*, sources.path AS srcpath, sources.hash AS srchash, formats.options AS fmtopts
			FROM videos
			JOIN sources ON videos.source = sources.id
			JOIN formats ON videos.video_format = formats.id
			WHERE videos.lecture_id = ?''', lectureid)
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	for video in videos:
		if not video['source']:
			continue
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		data = {'path': video['path'], 'srcpath': video['srcpath'], 'srchash': video['srchash']}
		fmt = json.loads(video['fmtopts'])
		if 'format' in fmt:
			data['format'] = fmt['format']
		data['options'] = fmt.get('options', {})
		set_metadata(data, course, lecture)
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		schedule_job('remux', data)

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def schedule_transcode(source, fmt_id=None, video=None):
	if video:
		fmt_id = video['video_format']
		assert(video['lecture_id'] == source['lecture_id'])
	assert(fmt_id != None)
	fmt = query('SELECT * FROM formats WHERE id = ?', fmt_id)[0]
	lecture = query('SELECT * FROM lectures WHERE id = ?', source['lecture_id'])[0]
	course = query('SELECT * FROM courses WHERE id = ?', lecture['course_id'])[0]
	data = {'input': {'path': source['path'], 'streams': []}, 'output': json.loads(fmt['options']), 'filters': []}
	if source['type'] == 'plain':
		stream = {'name': 'video', 'type': 'video'}
		data['input']['streams'].append(stream)
		stream = {'name': 'audio', 'type': 'audio'}
		data['input']['streams'].append(stream)
	else:
		assert(False)
	set_metadata(data['output'], course, lecture)
	basename = os.path.basename(source['path']).rsplit('.', 1)[0]
	data['output']['path'] = 'pub/'+course['handle']+'/'+basename+fmt['suffix']
	if video:
		old_source = query('SELECT * FROM sources WHERE id = ?', video['source'])
		data['output']['path'] = video['path']
		data['video_id'] = video['id']
		data['srcpath'] = old_source['path']
		data['srchash'] = old_source['hash']
	else:
		data['lecture_id'] = lecture['id']
	data['format_id'] = fmt['id']
	data['source_id'] = source['id']
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	schedule_job('transcode', data, queue="background")
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@job_handler('probe-raw')
def update_lecture_videos(jobid, jobtype, data, state, status):
	if 'lecture_id' not in data:
		return
	if 'source_id' not in data:
		modify('INSERT INTO sources (lecture_id, path, type, hash, time_created) VALUES (?, ?, ?, ?, ?)',
				data['lecture_id'], data['path'], 'plain', status['hash'], datetime.now())
	sources = query('SELECT * FROM sources WHERE sources.lecture_id = ? ORDER BY time_created', data['lecture_id'])
	if not sources:
		return
	latest = sources[-1]
	videos = query('SELECT * FROM videos WHERE videos.lecture_id = ?', data['lecture_id'])
	current_fmts = [v['video_format'] for v in videos]
	formats = query('''SELECT formats.* FROM formats
			JOIN profiles ON formats.id = profiles.format
			JOIN courses ON profiles.name = courses.profile
			JOIN lectures ON courses.id = lectures.course_id
			WHERE lectures.id = ?''', data['lecture_id'])
	for fmt in formats:
		if fmt['id'] not in current_fmts:
			schedule_transcode(latest, fmt_id=fmt['id'])
	for video in videos:
		if video['source'] != latest['id']:
			schedule_transcode(latest, video=video)

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@edit_handler('chapters')
def chapter_changed(table, column, value, id):
	print('chapter_changed')
	chapters = query('SELECT * FROM chapters WHERE id = ?', id)
	if not chapters:
		return
	chapter = chapters[0]
	if column in ['visible', 'deleted'] or (chapter['visible'] and not chapter['deleted']):
		schedule_remux(chapter['lecture_id'])

@edit_handler('courses')
def course_changed(table, column, value, id):
	if column not in ['title', 'organizer']:
		return
	lectures = query('SELECT * FROM lectures WHERE course_id = ?', id)
	for lecture in lectures:
		schedule_remux(lecture['id'])

@edit_handler('lectures')
def lecture_changed(table, column, value, id):
	if column in ['title', 'comment', 'time', 'speaker']:
		schedule_remux(id)