Method test_ieee_float_has_fact_chunk

Lib/test/test_wave.py:344–373

(self)

            self.assertIsNone(cm.unraisable)

    def test_ieee_float_has_fact_chunk(self):
        nframes = 100
        with tempfile.NamedTemporaryFile(delete_on_close=False) as fp:
            filename = fp.name
        self.addCleanup(unlink, filename)

        with wave.open(filename, 'wb') as w:
            w.setnchannels(1)
            w.setsampwidth(4)
            w.setframerate(22050)
            w.setformat(wave.WAVE_FORMAT_IEEE_FLOAT)
            w.writeframes(b'\x00\x00\x00\x00' * nframes)

        with open(filename, 'rb') as f:
            f.read(12)
            fact_found = False
            fact_samples = None
            while True:
                chunk_id = f.read(4)
                if len(chunk_id) < 4:
                    break
                chunk_size = struct.unpack('<L', f.read(4))[0]
                if chunk_id == b'fact':
                    fact_found = True
                    fact_samples = struct.unpack('<L', f.read(4))[0]
                    break
                f.seek(chunk_size + (chunk_size & 1), 1)

        self.assertTrue(fact_found)
        self.assertEqual(fact_samples, nframes)

    def test_pcm_has_no_fact_chunk(self):
        with tempfile.NamedTemporaryFile(delete_on_close=False) as fp: