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# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# =============================================================================
"""Tests for third_party.tensorflow.contrib.ffmpeg.encode_audio_op."""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os.path
import six
from tensorflow.contrib import ffmpeg
from tensorflow.python.framework import dtypes
from tensorflow.python.ops import array_ops
from tensorflow.python.platform import resource_loader
from tensorflow.python.platform import test
class EncodeAudioOpTest(test.TestCase):
def setUp(self):
super(EncodeAudioOpTest, self).setUp()
path = os.path.join(resource_loader.get_data_files_path(),
'testdata/mono_10khz.wav')
with open(path, 'rb') as f:
self._contents = f.read()
def _compareWavFiles(self, original, encoded):
"""Compares the important bits of two WAV files.
Some encoders will create a slightly different header to the WAV file.
This compares only the important bits of the header as well as the contents.
Args:
original: Contents of the original .wav file.
encoded: Contents of the new, encoded .wav file.
"""
self.assertLess(44, len(original))
self.assertLess(44, len(encoded))
self.assertEqual(original[:4], encoded[:4])
# Skip file size
self.assertEqual(original[8:16], encoded[8:16])
# Skip header size
self.assertEqual(original[20:36], encoded[20:36])
# Skip extra bits inserted by ffmpeg.
self.assertEqual(original[original.find(b'data'):],
encoded[encoded.find(b'data'):])
def testRoundTrip(self):
"""Reads a wav file, writes it, and compares them."""
with self.cached_session():
audio_op = ffmpeg.decode_audio(
self._contents,
file_format='wav',
samples_per_second=10000,
channel_count=1)
encode_op = ffmpeg.encode_audio(
audio_op, file_format='wav', samples_per_second=10000)
encoded_contents = encode_op.eval()
self._compareWavFiles(self._contents, encoded_contents)
def testRoundTripWithPlaceholderSampleRate(self):
with self.cached_session():
placeholder = array_ops.placeholder(dtypes.int32)
audio_op = ffmpeg.decode_audio(
self._contents,
file_format='wav',
samples_per_second=placeholder,
channel_count=1)
encode_op = ffmpeg.encode_audio(
audio_op, file_format='wav', samples_per_second=placeholder)
encoded_contents = encode_op.eval(feed_dict={placeholder: 10000})
self._compareWavFiles(self._contents, encoded_contents)
def testFloatingPointSampleRateInvalid(self):
with self.cached_session():
with self.assertRaises(TypeError):
ffmpeg.encode_audio(
[[0.0], [1.0]],
file_format='wav',
samples_per_second=12345.678)
def testZeroSampleRateInvalid(self):
with self.cached_session() as sess:
encode_op = ffmpeg.encode_audio(
[[0.0], [1.0]],
file_format='wav',
samples_per_second=0)
with six.assertRaisesRegex(self, Exception, 'must be positive'):
sess.run(encode_op)
def testNegativeSampleRateInvalid(self):
with self.cached_session() as sess:
encode_op = ffmpeg.encode_audio(
[[0.0], [1.0]],
file_format='wav',
samples_per_second=-2)
with six.assertRaisesRegex(self, Exception, 'must be positive'):
sess.run(encode_op)
if __name__ == '__main__':
test.main()
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