├── LICENSE ├── MANIFEST.in ├── PCM2Wav ├── PCM │ ├── PCM.py │ ├── __init__.py │ └── logic │ │ ├── __init__.py │ │ ├── saleae.py │ │ └── sigrok.py ├── PCM2Wav.py └── __init__.py ├── README.md ├── setup.cfg └── setup.py /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /MANIFEST.in: -------------------------------------------------------------------------------- 1 | include README.md 2 | -------------------------------------------------------------------------------- /PCM2Wav/PCM/PCM.py: -------------------------------------------------------------------------------- 1 | ''' 2 | File name: PCM.py 3 | Author: Roel Postelmans 4 | Date created: 2017 5 | ''' 6 | import errno 7 | import os 8 | 9 | 10 | class PCM(object): 11 | ''' 12 | PCM data parser (parent class) 13 | ''' 14 | def __init__(self, csv_file, first): 15 | ''' 16 | PCM data parser initiator 17 | ''' 18 | self.csv = open(csv_file, 'r') 19 | if not self.csv: 20 | raise FileNotFoundError(errno.ENOENT, 21 | os.strerror(errno.ENOENT), 22 | csv_file) 23 | nbr = 0 24 | for nbr, self.line in enumerate(self.csv): 25 | if nbr == first: 26 | self.start_time = self.line 27 | self.end_time = self.line 28 | self.sample_count = nbr 29 | self.sample_rate = 0 30 | 31 | def determine_sample_rate(self): 32 | ''' 33 | Calculate the sample rate 34 | Not supported by all kind of PCM data files! 35 | ''' 36 | self.sample_rate = self.end_time - self.start_time 37 | self.sample_rate /= self.sample_count 38 | self.sample_rate **= -1 39 | 40 | def pop_data(self): 41 | ''' 42 | Pop one line of data from the parse file 43 | ''' 44 | self.line = self.csv.readline() 45 | if self.line == '': 46 | raise EOFError 47 | self.sample_count += 1 48 | 49 | def reset(self): 50 | ''' 51 | Reset the parsing 52 | ''' 53 | self.sample_count = 0 54 | self.csv.seek(0, 0) 55 | 56 | def close(self): 57 | ''' 58 | Close the being parsed file 59 | ''' 60 | self.csv.close() 61 | -------------------------------------------------------------------------------- /PCM2Wav/PCM/__init__.py: -------------------------------------------------------------------------------- 1 | 2 | -------------------------------------------------------------------------------- /PCM2Wav/PCM/logic/__init__.py: -------------------------------------------------------------------------------- 1 | 2 | -------------------------------------------------------------------------------- /PCM2Wav/PCM/logic/saleae.py: -------------------------------------------------------------------------------- 1 | ''' 2 | File name: PCM.py 3 | Author: Roel Postelmans 4 | Date created: 2017 5 | ''' 6 | from ..PCM import PCM 7 | 8 | 9 | class I2S(PCM): 10 | ''' 11 | I2S data parser for the saleae logic analyzer 12 | ''' 13 | TIME_LOC = 0 14 | VALUE_LOC = -1 15 | CHANNEL_LOC = -2 16 | FIRST_D = 1 17 | 18 | def __init__(self, csv_file, delimiter=','): 19 | ''' 20 | Saleae I2S export parser initiator 21 | ''' 22 | super(I2S, self).__init__(csv_file, self.FIRST_D) 23 | self.delimiter = delimiter 24 | self.start_time = float(self.extract_value(self.start_time, 25 | self.TIME_LOC)) 26 | self.end_time = float(self.extract_value(self.end_time, 27 | self.TIME_LOC)) 28 | 29 | def extract_value(self, line, key): 30 | ''' 31 | Extract a value from a string by a given position 32 | ''' 33 | line = line.split(self.delimiter) 34 | line = line[key].rstrip() 35 | return line 36 | 37 | def determine_sample_rate(self): 38 | ''' 39 | Calculate the sample rate based on the 40 | timestamps 41 | ''' 42 | super(I2S, self).determine_sample_rate() 43 | # 2 samples per period 44 | self.sample_rate /= 2 45 | super(I2S, self).reset() 46 | return int(self.sample_rate) 47 | 48 | def pop_data(self): 49 | ''' 50 | Extract the values from one line of data 51 | ''' 52 | super(I2S, self).pop_data() 53 | # Skip header 54 | if self.sample_count <= self.FIRST_D: 55 | return self.pop_data() 56 | 57 | value = self.extract_value(self.line, self.VALUE_LOC) 58 | channel = self.extract_value(self.line, self.CHANNEL_LOC) 59 | 60 | if self.sample_count <= self.FIRST_D + 1: 61 | if int(channel) != 1: 62 | return self.pop_data() 63 | 64 | return channel, value 65 | 66 | def close(self): 67 | ''' 68 | Close the export file 69 | ''' 70 | self.sample_count -= self.FIRST_D 71 | super(I2S, self).close() 72 | -------------------------------------------------------------------------------- /PCM2Wav/PCM/logic/sigrok.py: -------------------------------------------------------------------------------- 1 | ''' 2 | File name: PCM.py 3 | Author: Roel Postelmans 4 | Date created: 2017 5 | ''' 6 | from ..PCM import PCM 7 | 8 | 9 | class I2S(PCM): 10 | ''' 11 | I2S data parser for sigrok protocol decoders 12 | 13 | format example: 14 | ... 15 | Left channel: 00010000 16 | Right channel: 00260000 17 | Left channel: 00010000 18 | Right channel: 00270000 19 | ... 20 | 21 | ''' 22 | VALUE_LOC = -1 23 | CHANNEL_LOC = 0 24 | FIRST_D = 0 25 | 26 | sample_rate = None 27 | line = None 28 | 29 | def __init__(self, csv_file, delimiter=' '): 30 | ''' 31 | Sigrok I2S export parser initiator 32 | ''' 33 | super(I2S, self).__init__(csv_file, self.FIRST_D) 34 | self.delimiter = delimiter 35 | 36 | def extract_value(self, line, key): 37 | ''' 38 | Extract a value from a string by a given position 39 | ''' 40 | line = line.split(self.delimiter) 41 | line = line[key].rstrip() 42 | return line 43 | 44 | def determine_sample_rate(self): 45 | ''' 46 | Returns the sample_rate or raises an exception 47 | when it has not been set. 48 | (no timestamps in sigrok export) 49 | ''' 50 | if self.sample_rate is None: 51 | raise ValueError("Sigrok export doesn't contain timestamps," 52 | "you have to set sigrok.sample_rate") 53 | super(I2S, self).reset() 54 | return self.sample_rate 55 | 56 | def pop_data(self): 57 | ''' 58 | Extract the values from one line of data 59 | ''' 60 | d_channel = {"Left": 0, "Right": 1} 61 | if self.line is None: 62 | super(I2S, self).pop_data() 63 | value = self.extract_value(self.line, self.VALUE_LOC)[:4] 64 | channel = self.extract_value(self.line, self.CHANNEL_LOC) 65 | else: 66 | value = self.extract_value(self.line, self.VALUE_LOC)[4:] 67 | channel = self.extract_value(self.line, self.CHANNEL_LOC) 68 | self.line = None 69 | 70 | value = int(value, 16) 71 | # check sign bit 72 | if (value & 0x8000) == 0x8000: 73 | value = -((value ^ 0xffff) + 1) 74 | return d_channel[channel], value 75 | 76 | def close(self): 77 | ''' 78 | Close the export file 79 | ''' 80 | self.sample_count -= self.FIRST_D 81 | super(I2S, self).close() 82 | -------------------------------------------------------------------------------- /PCM2Wav/PCM2Wav.py: -------------------------------------------------------------------------------- 1 | ''' 2 | File name: PCM2Wav.py 3 | Author: Roel Postelmans 4 | Date created: 2017 5 | ''' 6 | # Avoid integer division in python 2 7 | from __future__ import division, print_function 8 | import struct 9 | import wave 10 | from .PCM.logic import saleae as _saleae 11 | from .PCM.logic import sigrok as _sigrok 12 | 13 | 14 | class PCM2Wav(object): 15 | ''' 16 | PCM data to Wav converter 17 | ''' 18 | saleae = _saleae 19 | sigrok = _sigrok 20 | analyzers = saleae, sigrok 21 | sample_freq = 48000 22 | sample_width = 2 23 | channels = 2 24 | chunk_size = 256 25 | 26 | __formats = {1: 'c', 2: 'h'} 27 | __sample_rates = 16000, 32000, 44100, 48000, 96000, 128000 28 | 29 | def __init__(self, PCM_parser, csv_file, dst): 30 | """ 31 | PCM2Wav initialiser 32 | """ 33 | self.data = PCM_parser(csv_file) 34 | self._generate(dst) 35 | 36 | def _generate(self, dst): 37 | """ 38 | The actual conversion 39 | """ 40 | generating = True 41 | wav_file = wave.open(dst, 'wb') 42 | wav_file.setnchannels(self.channels) 43 | wav_file.setsampwidth(self.sample_width) 44 | sample_rate = self.data.determine_sample_rate() 45 | frame_rate = min(self.__sample_rates, key=lambda x: abs(x-sample_rate)) 46 | wav_file.setframerate(frame_rate) 47 | while generating: 48 | try: 49 | channels = [self.data.pop_data()[1] 50 | for DISCARD in range(0, self.chunk_size)] 51 | except EOFError: 52 | generating = False 53 | self.data.close() 54 | frame = self._calc_frame(channels) 55 | wav_file.writeframes(frame) 56 | wav_file.close() 57 | 58 | def _chr(self, arg): 59 | if self.sample_width == 1: 60 | return chr(arg) 61 | return arg 62 | 63 | def _sample_2_bin(self, sample): 64 | return struct.pack(self.__formats[self.sample_width], 65 | self._chr(int(sample))) 66 | 67 | def _calc_frame(self, channels_data): 68 | return b"".join(self._sample_2_bin(sample) for sample in channels_data) 69 | -------------------------------------------------------------------------------- /PCM2Wav/__init__.py: -------------------------------------------------------------------------------- 1 | __all__ = ['PCM2Wav'] 2 | 3 | from .PCM2Wav import PCM2Wav 4 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | PCM2Wav-py 2 | ============= 3 | 4 | This library implements a converter for PCM data to Wav audio format, 5 | obtained with logic analyzers. 6 | 7 | For example I2S signals obtained with the Saleae logic analyzer. 8 | 9 | 10 | Current supported formats 11 | ------------------------- 12 | 13 | * I2S signals obtained and exported with the Saleae logic analyzer. 14 | * I2S signals obtained with Sigrok (Software that supports multiple hardware devices) 15 | 16 | Installation 17 | ------------ 18 | 19 | (sudo) pip install PCM2Wav 20 | 21 | 22 | Usage 23 | ----- 24 | 25 | python 26 | from PCM2Wav import * 27 | output = PCM2Wav(PCM2Wav.saleae.I2S, "i2s.csv", "example.wav") 28 | -------------------------------------------------------------------------------- /setup.cfg: -------------------------------------------------------------------------------- 1 | [metadata] 2 | description-file = README.md 3 | 4 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | from setuptools import setup, find_packages 2 | 3 | def readme(): 4 | with open('README.md') as f: 5 | return f.read() 6 | 7 | setup( 8 | name='PCM2Wav', 9 | version='1.3', 10 | packages=find_packages(), 11 | description="A PCM data to Wav audio format converter", 12 | long_description=readme(), 13 | url="https://github.com/roel0/PCM2Wav-py", 14 | author="Roel Postelmans", 15 | author_email="postelmansroel@gmail.com", 16 | license="GPL-2.0", 17 | classifiers=[ 18 | "Intended Audience :: Developers", 19 | "Programming Language :: Python", 20 | "Programming Language :: Python :: 2", 21 | "Programming Language :: Python :: 2.7", 22 | "Programming Language :: Python :: 3", 23 | "Programming Language :: Python :: 3.6", 24 | "Operating System :: OS Independent", 25 | "Topic :: Scientific/Engineering", 26 | "Topic :: Software Development :: Embedded Systems", 27 | "Topic :: Utilities", 28 | ], 29 | keywords='PCM I2S sigrok saleae wav audio', 30 | install_requires=['wave'], 31 | include_package_data=True, 32 | ) 33 | --------------------------------------------------------------------------------