| # Copyright (c) 2014 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """Audio utilities.""" |
| |
| class AudioDataFormat(object): |
| """The class to represent audio data format. |
| |
| Properties: |
| file_type: 'raw' or 'wav'. |
| sample_format: 'S32_LE' for 32-bit signed integer in little-endian. |
| Refer to aplay manpage for other formats. |
| channel: channel number. |
| rate: sampling rate in Hz. |
| """ |
| def __init__(self, file_type, sample_format, channel, rate): |
| """Initializes an AudioDataFormat object. |
| |
| Args: |
| file_type: 'raw' or 'wav'. |
| sample_format: 'S32_LE' for 32-bit signed integer in little-endian. |
| Refer to aplay manpage for other formats. |
| channel: channel number. |
| rate: sampling rate in Hz. |
| """ |
| self.file_type = file_type |
| self.sample_format = sample_format |
| self.channel = channel |
| self.rate = rate |
| |
| def AsDict(self): |
| """Returns data format in a dict. |
| |
| Returns: |
| A dict containing file_type, sample_format, channel, rate. |
| """ |
| return dict( |
| file_type=self.file_type, |
| sample_format=self.sample_format, |
| channel=self.channel, |
| rate=self.rate) |
| |
| def CreateAudioDataFormatFromDict(data_format_dict): |
| return AudioDataFormat(data_format_dict['file_type'], |
| data_format_dict['sample_format'], |
| data_format_dict['channel'], |
| data_format_dict['rate']) |
