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#      Institut Federatif de Recherche 49
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from brainvisa.processes import *
from brainvisa.validation import ValidationError
from brainvisa.configuration import mpegConfig
import os, shfjGlobals

name = 'Mencoder MPEG encoder'
userLevel = 2

def validation():
  if 'mencoder' not in mpegConfig.encoders:
    raise ValidationError( _t_( 'Mencoder not present' ) )


def codecs():
  c = mpegConfig.codecs.get( 'mencoder' )
  if c is not None:
    return c
  return {}


signature = Signature(
  'images', ListOf( ReadDiskItem( '2D Image', shfjGlobals.aimsImageFormats,
                                  ignoreAttributes=1 ) ),
  'animation', WriteDiskItem( 'MPEG film', mpegConfig.mpegFormats ),
  'encoding', Choice( *codecs() ),
  'quality', Integer(), 
  'framesPerSecond', Integer(), 
  'passes', Choice( 1, 2 ), 
)


def initialization( self ):
  self.quality = 75
  self.framesPerSecond = 25
  self.passes = 1


def execution( self, context ):
  if len( self.images ) == 0:
    raise RuntimeError( 'No image selected' )
  context.write( self.images[ 0 ] )
  attrs = shfjGlobals.aimsVolumeAttributes( self.images[ 0 ], forceFormat=1 )
  context.write( attrs )
  width = attrs[ 'volume_dimension' ][ 0 ]

  im = map( lambda x: x.fullPath(), self.images )
  passlog = context.temporary( 'log file' )
  cmd = [ 'mencoder', 'mf://' + string.join( im, ',' ),
          '-o', self.animation.fullPath(), '-mf',
          'fps=' + str( self.framesPerSecond ), '-ovc', 'lavc',
          '-passlogfile', passlog, '-lavcopts',
          'vbitrate=' + str( self.quality*10 ) + ':vcodec=' \
          + self.encoding + ':vpass=1' ]
  # print cmd
  context.system( *cmd )
  if self.passes > 1:
    cmd[ -1 ] = cmd[ -1 ][ :-1 ] + '2'
    # print cmd
    context.system( *cmd )