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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| """Utilities to call ffmpeg from Python. | ||
| For more information, refer to https://www.ffmpeg.org/ | ||
| """ | ||
| from __future__ import print_function | ||
|
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| import logging | ||
| import os | ||
| import subprocess | ||
|
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||
| import claudio.formats as formats | ||
| import claudio.util as util | ||
|
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| try: | ||
| FileNotFoundError | ||
| except NameError: | ||
| FileNotFoundError = OSError | ||
|
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| logging.basicConfig(level=logging.DEBUG) | ||
|
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| # Error Message for SoX | ||
| __NO_FFMPEG__ = """ffmpeg could not be found! | ||
| If you do not have ffmpeg, proceed here: | ||
| - - - https://www.ffmpeg.org/ - - - | ||
| If you do (or think that you should) have ffmpeg, double-check your | ||
| path variables.""" | ||
|
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|
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| class FFMpegError(BaseException): | ||
| pass | ||
|
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|
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| def __BIN__(): | ||
| return 'ffmpeg' | ||
|
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| def _check(): | ||
| """Test for FFMpeg. | ||
| Returns | ||
| ------- | ||
| success : bool | ||
| True if it looks like ffmpeg exists. | ||
| """ | ||
| try: | ||
| info = subprocess.check_output([__BIN__(), '-version']) | ||
| status = 'ffmpeg version' in str(info) | ||
| message = __NO_FFMPEG__ | ||
| except (FileNotFoundError, subprocess.CalledProcessError) as derp: | ||
| status = False | ||
| message = __NO_FFMPEG__ + "\n{}".format(derp) | ||
| if status: | ||
| logging.info(message) | ||
| else: | ||
| logging.warning(message) | ||
| return status | ||
|
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|
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| def check_ffmpeg(): | ||
| """Assert that SoX is present and can be called.""" | ||
| if not _check(): | ||
| raise FFMpegError("SoX check failed.\n{}".format(__NO_FFMPEG__)) | ||
|
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| def convert(input_file, output_file, | ||
| samplerate=None, channels=None, bytedepth=None): | ||
| """Converts one audio file to another on disk. | ||
| Parameters | ||
| ---------- | ||
| input_file : str | ||
| Input file to convert. | ||
| output_file : str | ||
| Output file to writer. | ||
| samplerate : float, default=None | ||
| Desired samplerate. If None, defaults to the same as input. | ||
| channels : int, default=None | ||
| Desired channels. If None, defaults to the same as input. | ||
| bytedepth : int, default=None | ||
| Desired bytedepth. If None, defaults to the same as input. | ||
| Returns | ||
| ------- | ||
| status : bool | ||
| True on success. | ||
| """ | ||
| args = ['-i', input_file] | ||
|
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||
| if bytedepth: | ||
| raise NotImplementedError("Haven't gotten here yet.") | ||
| if channels: | ||
| args += ['-ac', str(channels)] | ||
| if samplerate: | ||
| args += ['-ar', str(samplerate)] | ||
|
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| args += [output_file, '-y'] | ||
|
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| return ffmpeg(args) | ||
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| def ffmpeg(args): | ||
| """Pass an argument list to ffmpeg. | ||
| Parameters | ||
| ---------- | ||
| args : list | ||
| Argument list for ffmpeg. | ||
| Returns | ||
| ------- | ||
| success : bool | ||
| True on successful calls to ffmpeg. | ||
| """ | ||
| check_ffmpeg() | ||
| util.validate_clargs(args) | ||
| args = [__BIN__()] + list(args) | ||
|
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| try: | ||
| logging.debug("Executing: {}".format(args)) | ||
| process_handle = subprocess.Popen(args, stderr=subprocess.PIPE) | ||
| status = process_handle.wait() | ||
| logging.debug(process_handle.stdout) | ||
| return status == 0 | ||
| except OSError as error_msg: | ||
| logging.error("OSError: ffmpeg failed! {}".format(error_msg)) | ||
| except TypeError as error_msg: | ||
| logging.error("TypeError: {}".format(error_msg)) | ||
| return False | ||
|
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|
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| def is_valid_file_format(input_file): | ||
| """Determine if a given file is supported by FFMPEG based on its | ||
| extension. | ||
| Parameters | ||
| ---------- | ||
| input_file : str | ||
| Audio file to verify for support. | ||
| Returns | ||
| ------- | ||
| status : bool | ||
| True if supported. | ||
| """ | ||
| raise NotImplementedError("Come back to this.") | ||
| # File extension | ||
| file_ext = os.path.splitext(input_file)[-1] | ||
| # Return False if the file lacks an extension. | ||
| if not file_ext: | ||
| return False | ||
| # Remove dot-separator. | ||
| file_ext = file_ext.strip(".") | ||
| # Pure wave support | ||
| if file_ext == formats.WAVE: | ||
| return True | ||
|
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| # Otherwise, check against SoX. | ||
| else: | ||
| check_ffmpeg() | ||
| info = str(subprocess.check_output([__BIN__(), '-codecs'])) | ||
| valid = file_ext in info | ||
| if valid: | ||
| logging.debug("FFMpeg supports '{}' files.".format(file_ext)) | ||
| else: | ||
| logging.debug("SoX does not support '{}' files.".format(file_ext)) | ||
|
|
||
| return valid |
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