terminal.py 文件源码

def helper(self, term_instance):
        """
        Called at the start of a WAV file capture.  Calculates the length of the
        file and modifies `self.re_capture` with laser precision.
        """
        data = term_instance.capture
        self.wav_header = struct.unpack(
            '4si4s4sihhiihh4si', self.re_wav_header.match(data).group())
        self.wav_length = self.wav_header[1] + 8
        if not self.sent_message:
            channels = "mono"
            if self.wav_header[6] == 2:
                channels = "stereo"
            if self.wav_length != self.wav_header[12] + 44:
                # Corrupt WAV file
                message = _("WAV File is corrupted: Header data mismatch.")
                term_instance.send_message(message)
                term_instance.cancel_capture = True
            message = _("WAV File: %skHz (%s)" % (self.wav_header[7], channels))
            term_instance.send_message(message)
            self.sent_message = True
        # Update the capture regex with laser precision:
        self.re_capture = re.compile(
            b'(RIFF....WAVE.{%s})' % (self.wav_length-12), re.DOTALL)