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from brainvisa.processes import *
from brainvisa.validation import ValidationError
from brainvisa.configuration import mpegConfig
import os, shfjGlobals

name = 'Transcode MPEG encoder'
userLevel = 2

def validation():
  if 'transcode' not in mpegConfig.encoders:
    raise ValidationError( _t_( 'Transcode 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() ),
  'framesPerSecond', Integer(), 
)


def initialization( self ):
  self.framesPerSecond = 25


def execution( self, context ):
  #context.write( 'encoder:', self.encoder )
  attrs = shfjGlobals.aimsVolumeAttributes( self.images[ 0 ], forceFormat=1 )
  width = attrs[ 'volume_dimension' ][ 0 ]

  tmpdi = context.temporary( 'File' )
  tmp = tmpdi.fullPath()
  tfile = open( tmp, 'w' )
  im = map( lambda x: x.fullPath(), self.images )
  tfile.write( string.join( im, '\n' ) )
  tfile.write( '\n' )
  tfile.close()
  f = open( tmp )
  context.log( 'transcode input files', html=f.read() )
  f.close()
  #os.system( 'cat ' + tmp )
  height = attrs[ 'volume_dimension' ][ 1 ]
  context.system( 'transcode', '-x', 'imlist,null', '-y',
                  self.encoding + ',null', '-i', tmp, '-g',
                  str( width ) + 'x' + str( height ), '-H', 0, 
                  '-o', self.animation.fullPath(), '-f',
                  self.framesPerSecond )