def extract_image_thumbnail(auth_params, func_params):
"""
This function is used to create a thumbnail for a image item.
A cropped and resized portion of the original image is used as
thumbnail for each digital item. The thumbnail image size is 256*256 pixels.
@param auth_params: Input parameters of the function that generate this function call
@param func_params: Output parameters of the function that generate this function call
"""
# construct start and final path for digital items
file_path = os.path.join(get_media_root(), func_params['file'])
thumb_path = os.path.join('/tmp', str(func_params['id']) + '_thumb.jpeg')
# generate the thumbnail for the image
cmd = 'ffmpeg -loglevel fatal -y -i "' + file_path + '" -vf "crop=min(iw\,ih):min(ih\,iw), scale=256:256" -vframes 1 ' + thumb_path
subprocess.check_output(cmd, shell=True)
token = auth_params['token']
# check if the thumbnail has been created otherwise create a standard thumbnail
if not os.path.exists(thumb_path):
# create the default thumbnail, coping from a known directory
default_thumb_path = os.path.join(get_media_root(), 'thumbnails', 'image.jpeg')
shutil.copyfile(default_thumb_path, thumb_path)
# send the thumbnail to the core
res = set_thumbnail(func_params['id'], thumb_path, 'image/jpeg',token)
# delete the temporary thumbnail from local filesystem
os.remove(thumb_path)
if not res:
raise Exception("Error on video thumbnail generation " + str(func_params['id']))
def extract_audio_thumbnail(auth_params, func_params):
"""
This function is used to create a thumbnail for an audio item.
A standard image is used as thumbnail for all audio files.
@param auth_params: Input parameters of the function that generate this function call
@param func_params: Output parameters of the function that generate this function call
"""
# construct a standard thumbnail for the audio file
thumb_path = os.path.join('/tmp', str(func_params['id']) + '_thumb.jpeg')
default_thumb_path = os.path.join(get_media_root(), 'thumbnails', 'audio.jpeg')
shutil.copyfile(default_thumb_path, thumb_path)
token = auth_params['token']
# send the thumbnail to the core
res = set_thumbnail(func_params['id'], thumb_path, 'image/jpeg',token)
# delete the temporary thumbnail from local filesystem
os.remove(thumb_path)
if not res:
raise Exception("Error on thumbnail generation for audio item " + str(func_params['id']))
