| Owen Lin | ca365f8 | 2013-11-08 16:52:28 +0800 | [diff] [blame] | 1 | # Copyright (c) 2013 The Chromium Authors. All rights reserved. |
| 2 | # Use of this source code is governed by a BSD-style license that can be |
| 3 | # found in the LICENSE file. |
| 4 | |
| 5 | SOX_PATH = '/usr/local/bin/sox' |
| 6 | |
| 7 | def generate_sine_tone_cmd( |
| 8 | filename, channels=2, bits=16, rate=44100, duration=None, frequence=440, |
| 9 | gain=None): |
| 10 | """Gets a command to generate sine tones at specified ferquencies. |
| 11 | |
| 12 | @param filename: the name of the file to store the sine wave in. |
| 13 | @param channels: the number of channels. |
| 14 | @param bits: the number of bits of each sample. |
| 15 | @param rate: the sampling rate. |
| 16 | @param duration: the length of the generated sine tone (in seconds). |
| 17 | @param frequence: the frequence of the sine wave. |
| 18 | @param gain: the gain (in db). |
| 19 | """ |
| 20 | args = [SOX_PATH, '-n', '-t', 'raw'] |
| 21 | args += ['-c', str(channels)] |
| 22 | args += ['-b', str(bits)] |
| 23 | args += ['-r', str(rate)] |
| 24 | args.append(filename) |
| 25 | args.append('synth') |
| 26 | if duration is not None: |
| 27 | args.append(str(duration)) |
| 28 | args += ['sine', str(frequence)] |
| 29 | if gain is not None: |
| 30 | args += ['gain', str(gain)] |
| 31 | return args |