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nigel.stanger
/
process_podcast
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Clarified confusing comment.
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c2eb6f97d041ed15cfd65570123cd7ab0118f8c3
Nigel Stanger
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on 23 Sep 2018
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shell_command.py
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shell_command.py
#!/usr/bin/env python3 import datetime import json import tempfile from pathlib import Path import re import shutil import pexpect from progress_bar import (ProgressBar) class ShellCommand(object): """A shell command. _executable contains the full path to the relevant executable. _base_options is a list of standard general options for this command. """ _executable = "" _base_options = [] _expect_patterns = [] @staticmethod def shellquote(s): """Quote a string so it can be safely pasted into the shell.""" # Note: pipes/shlex.quote() only wraps '' around things, # it doesn't do things like \( \), which we also need. # We double-quote everything because that makes it easier # to deal with single quotes. if s: regexes = [ # grouping parentheses for convert re.compile(r"^(\(|\))$"), # double quote (in middle of string) re.compile(r'^(.+".*)$'), # quotes around entire string re.compile(r"""^((?P<quote>['"]).*(?P=quote))$"""), # command line switch (starts with one or two "-") re.compile(r"^(--?.+)$"), # command path (starts with "/") re.compile(r"^(/[\w/]+)$")] substitutions = [r"\\\1", r"'\1'", r"\1", r"\1", r"\1"] num_matches = 0 for subst in zip(regexes, substitutions): (s, n) = subst[0].subn(subst[1], s) num_matches += n if num_matches == 0: # catch-all for non-word characters when none of the other # substitutions apply s = re.compile(r"^(.*\W+.*)$").sub(r'"\1"', s) return s def __init__(self, input_options=[], output_options=[], quiet=False): self.input_options = input_options self.output_options = output_options self.progress = None self.process = None def __repr__(self): return "<{cls}: {cmd}>".format( cls=self.__class__.__name__, cmd=self.command_string(quote=True)) def append_input_options(self, items=[]): """Add a list of items to the end of the input options.""" self.input_options += items def prepend_input_options(self, items=[]): """Add a list of items at the front of the input options.""" self.input_options = items + self.input_options def append_output_options(self, items=[]): """Add a list of items to the end of the output options.""" self.output_options += items def prepend_output_options(self, items=[]): """Add a list of items at the front of the output options.""" self.output_options = items + self.output_options def executable_string(self, quote=False): """Return the executable as a string.""" if quote: return ShellCommand.shellquote(self._executable) else: return self._executable def argument_string(self, quote=False): """Return the list of arguments as a string.""" args = self._base_options + self.input_options + self.output_options if quote: return " ".join([ShellCommand.shellquote(a) for a in args]) else: return " ".join(args) def argument_list(self): """Return a combined list of all arguments.""" return self._base_options + self.input_options + self.output_options def command_string(self, quote=False): """Return the entire command as a string.""" return "{exe} {arg}".format(exe=self.executable_string(quote), arg=self.argument_string(quote)) def process_pattern(self, pat): """Respond to a pexpect pattern. Return True on EOF.""" return (pat == 0) def run(self): """Execute the command in a subprocess.""" self.process = pexpect.spawn(self.executable_string(), self.argument_list()) # EOF is *always* the first pattern. patterns = self.process.compile_pattern_list( [pexpect.EOF] + self._expect_patterns) try: while True: i = self.process.expect_list(patterns, timeout=None) if self.process_pattern(i): break except (KeyboardInterrupt): pass finally: if self.progress: self.progress.finish() self.process.close() return self.process.exitstatus def get_output(self): """Execute the command in a subprocess and return the output.""" return pexpect.run(self.command_string(quote=True)) class ConvertCommand(ShellCommand): """An ImageMagick convert command.""" _executable = shutil.which("convert") _base_options = ["-density", "600", "xc:dimgrey", "null:", # dark grey background "("] def __init__(self, input_options=[], output_options=[], width=2048, height=1536): super().__init__(input_options, output_options) self._base_options = (["-size", "{w}x{h}".format(w=width, h=height)] + self._base_options) self.append_input_options( ["-resize", "{w}x{h}".format(w=width, h=height), "-background", "white", "-alpha", "remove", "-type", "truecolor", # force RGB (this and next line) "-define", "colorspace:auto-grayscale=off"]) self.prepend_output_options([")", "-gravity", "center", "-layers", "composite", "-flatten"]) class FFprobeCommand(ShellCommand): """An ffprobe shell command.""" _executable = shutil.which("ffprobe") _base_options = ["-loglevel", "error", "-show_entries", "format:stream", "-print_format", "json"] def __init__(self, input_options=[], output_options=[]): super().__init__(input_options, output_options) self.entries = None # The input file should be the last input option. assert(Path(self.input_options[-1]).exists()) self.last_modified = Path(self.input_options[-1]).stat().st_mtime def get_entries(self, section="stream", find_list=[]): """Fetch specified attributes from the input file.""" # Re-fetch if the file's changed since we last looked. modified = Path(self.input_options[-1]).stat().st_mtime if (not self.entries) or (modified > self.last_modified): js = json.loads(self.get_output()) self.entries = {"format": js["format"], "stream": js["streams"][0]} return [self.entries[section][f] for f in find_list] class FFmpegCommand(ShellCommand): """A "simple" ffmpeg shell command.""" _executable = shutil.which("ffmpeg") _base_options = ["-y", "-nostdin"] class FFmpegConcatCommand(FFmpegCommand): """An ffmpeg shell command with a complex concat filter.""" _expect_patterns = [r"time=(\d\d):(\d\d):(\d\d\.\d\d)"] def __init__(self, input_options=[], output_options=[], quiet=False, max_progress=100, has_audio=False, has_video=False, process_audio=True, process_video=True, audio_codec="pcm_s16le", video_codec="h264"): super().__init__(input_options, output_options) self.progress = ProgressBar(max_value=max_progress, quiet=quiet) self.has_video = has_video self.process_video = process_video self.video_codec = video_codec if (self.has_video): self.prepend_output_options(["-map", "[vconc]"]) if (self.process_video): self.prepend_output_options(["-pix_fmt", "yuv420p"]) self.prepend_output_options(["-codec:v", self.video_codec]) self.has_audio = has_audio self.process_audio = process_audio self.audio_codec = audio_codec if (self.has_audio): if (self.process_audio): self.prepend_output_options(["-ac", "1", "-map", "[anorm]"]) else: self.prepend_output_options(["-map", "[aconc]"]) self.prepend_output_options(["-codec:a", self.audio_codec]) self.filters = [] def append_filter(self, filter): """Append a filter to the filters list.""" if (filter): self.filters.append(filter) def append_normalisation_filter(self): """Append a normalisation audio filter to the complex filter.""" if (self.has_audio): self.append_filter("[aconc] dynaudnorm=r=0.25:f=10:b=y [anorm]") def append_concat_filter(self, frame_type, segments=[]): """Append a concat filter to the filters list""" # Ignore frame segments. if frame_type in ["a", "v"]: if (len(segments) > 1): self.append_filter( "{inspecs} concat=n={n}:v={v}:a={a} [{t}conc]".format( inspecs=" ".join([s.output_stream_specifier() for s in segments]), n=len(segments), v=int(frame_type == "v"), a=int(frame_type == "a"), t=frame_type)) elif (len(segments) == 1): self.append_filter( "{inspec} {a}null [{t}conc]".format( inspec=segments[0].output_stream_specifier(), a=frame_type if frame_type == "a" else "", t=frame_type)) def build_complex_filter(self): """Build the complete complex filter. Filters in the filtergraph are separated by ";". """ return "{f}".format(f=";".join(self.filters)) def argument_string(self, quote=False): """Return the list of arguments as a string.""" args = (self._base_options + self.input_options + ["-filter_complex", self.build_complex_filter()] + self.output_options) if quote: return " ".join([ShellCommand.shellquote(a) for a in args]) else: return " ".join(args) def argument_list(self): """Return a combined list of all arguments.""" return (self._base_options + self.input_options + ["-filter_complex", self.build_complex_filter()] + self.output_options) def process_pattern(self, pat): """Respond to a pexpect pattern. Return True on EOF.""" if (pat == 1): elapsed = datetime.timedelta( hours=int(self.process.match.group(1)), minutes=int(self.process.match.group(2)), seconds=float(self.process.match.group(3))) self.progress.update(elapsed.total_seconds()) return (pat == 0) if (__name__ == "__main__"): print(ShellCommand()) print(ConvertCommand(input_options=["in.pdf[12]"], output_options=["out.png"])) # FFprobeCommand expects the input file to exist. f = tempfile.NamedTemporaryFile() print(FFprobeCommand(input_options=["-i", f.name])) f.close() print(FFmpegCommand(input_options=["-i", "in.mov"], output_options=["out.mov"])) concat = FFmpegConcatCommand(input_options=["-i", "in.mov"], output_options=["out.mov"], has_audio=True) concat.append_normalisation_filter() print(concat) print("Quoting:") for s in ["foobar", "foo bar baz", "foo(bar)", "[foobar]", "foo[bar", "foo 'bar'", '"foobar"', "'foobar'", 'foo"bar', "foo.bar", "(", ")", "'", "/foo/bar/baz/quux", "-f", "--foobar"]: print(" {s} => echo {sub}".format(s=s, sub=ShellCommand.shellquote(s)))
#!/usr/bin/env python3 import datetime import json import tempfile from pathlib import Path import re import shutil import pexpect from progress_bar import (ProgressBar) class ShellCommand(object): """A shell command. _executable contains the full path to the relevant executable. _base_options is a list of standard general options for this command. """ _executable = "" _base_options = [] _expect_patterns = [] @staticmethod def shellquote(s): """Quote a string so it can be safely pasted into the shell.""" # Note: pipes/shlex.quote() only wraps '' around things, # it doesn't do things like \( \), which we also need. # We double-quote everything because that makes it easier # to deal with single quotes. if s: regexes = [ # grouping parentheses for convert re.compile(r"^(\(|\))$"), # double quote (in middle of string) re.compile(r'^(.+".*)$'), # quotes around entire string re.compile(r"""^((?P<quote>['"]).*(?P=quote))$"""), # command line switch (starts with one or two "-") re.compile(r"^(--?.+)$"), # command path (starts with "/") re.compile(r"^(/[\w/]+)$")] substitutions = [r"\\\1", r"'\1'", r"\1", r"\1", r"\1"] num_matches = 0 for subst in zip(regexes, substitutions): (s, n) = subst[0].subn(subst[1], s) num_matches += n if num_matches == 0: # catch-all for non-word characters when none of the other # substitutions apply s = re.compile(r"^(.*\W+.*)$").sub(r'"\1"', s) return s def __init__(self, input_options=[], output_options=[], quiet=False): self.input_options = input_options self.output_options = output_options self.progress = None self.process = None def __repr__(self): return "<{cls}: {cmd}>".format( cls=self.__class__.__name__, cmd=self.command_string(quote=True)) def append_input_options(self, items=[]): """Add a list of items to the end of the input options.""" self.input_options += items def prepend_input_options(self, items=[]): """Add a list of items at the front of the input options.""" self.input_options = items + self.input_options def append_output_options(self, items=[]): """Add a list of items to the end of the output options.""" self.output_options += items def prepend_output_options(self, items=[]): """Add a list of items at the front of the output options.""" self.output_options = items + self.output_options def executable_string(self, quote=False): """Return the executable as a string.""" if quote: return ShellCommand.shellquote(self._executable) else: return self._executable def argument_string(self, quote=False): """Return the list of arguments as a string.""" args = self._base_options + self.input_options + self.output_options if quote: return " ".join([ShellCommand.shellquote(a) for a in args]) else: return " ".join(args) def argument_list(self): """Return a combined list of all arguments.""" return self._base_options + self.input_options + self.output_options def command_string(self, quote=False): """Return the entire command as a string.""" return "{exe} {arg}".format(exe=self.executable_string(quote), arg=self.argument_string(quote)) def process_pattern(self, pat): """Respond to a pexpect pattern. Return True on EOF.""" return (pat == 0) def run(self): """Execute the command in a subprocess.""" self.process = pexpect.spawn(self.executable_string(), self.argument_list()) # EOF is *always* the first pattern. patterns = self.process.compile_pattern_list( [pexpect.EOF] + self._expect_patterns) try: while True: i = self.process.expect_list(patterns, timeout=None) if self.process_pattern(i): break except (KeyboardInterrupt): pass finally: if self.progress: self.progress.finish() self.process.close() return self.process.exitstatus def get_output(self): """Execute the command in a subprocess and return the output.""" return pexpect.run(self.command_string(quote=True)) class ConvertCommand(ShellCommand): """An ImageMagick convert command.""" _executable = shutil.which("convert") _base_options = ["-density", "600", "xc:dimgrey", "null:", # dark grey background "("] def __init__(self, input_options=[], output_options=[], width=2048, height=1536): super().__init__(input_options, output_options) self._base_options = (["-size", "{w}x{h}".format(w=width, h=height)] + self._base_options) self.append_input_options( ["-resize", "{w}x{h}".format(w=width, h=height), "-background", "white", "-alpha", "remove", "-type", "truecolor", # force RGB (this and next line) "-define", "colorspace:auto-grayscale=off"]) self.prepend_output_options([")", "-gravity", "center", "-layers", "composite", "-flatten"]) class FFprobeCommand(ShellCommand): """An ffprobe shell command.""" _executable = shutil.which("ffprobe") _base_options = ["-loglevel", "error", "-show_entries", "format:stream", "-print_format", "json"] def __init__(self, input_options=[], output_options=[]): super().__init__(input_options, output_options) self.entries = None # The input file should be the last input option. assert(Path(self.input_options[-1]).exists()) self.last_modified = Path(self.input_options[-1]).stat().st_mtime def get_entries(self, section="stream", find_list=[]): """Fetch specified attributes from the input file.""" # Re-fetch if the file's changed since we last looked. modified = Path(self.input_options[-1]).stat().st_mtime if (not self.entries) or (modified > self.last_modified): js = json.loads(self.get_output()) self.entries = {"format": js["format"], "stream": js["streams"][0]} return [self.entries[section][f] for f in find_list] class FFmpegCommand(ShellCommand): """A "simple" ffmpeg shell command.""" _executable = shutil.which("ffmpeg") _base_options = ["-y", "-nostdin"] class FFmpegConcatCommand(FFmpegCommand): """An ffmpeg shell command with a complex concat filter.""" _expect_patterns = [r"time=(\d\d):(\d\d):(\d\d\.\d\d)"] def __init__(self, input_options=[], output_options=[], quiet=False, max_progress=100, has_audio=False, has_video=False, process_audio=True, process_video=True, audio_codec="pcm_s16le", video_codec="h264"): super().__init__(input_options, output_options) self.progress = ProgressBar(max_value=max_progress, quiet=quiet) self.has_video = has_video self.process_video = process_video self.video_codec = video_codec if (self.has_video): self.prepend_output_options(["-map", "[vconc]"]) if (self.process_video): self.prepend_output_options(["-pix_fmt", "yuv420p"]) self.prepend_output_options(["-codec:v", self.video_codec]) self.has_audio = has_audio self.process_audio = process_audio self.audio_codec = audio_codec if (self.has_audio): if (self.process_audio): self.prepend_output_options(["-ac", "1", "-map", "[anorm]"]) else: self.prepend_output_options(["-map", "[aconc]"]) self.prepend_output_options(["-codec:a", self.audio_codec]) self.filters = [] def append_filter(self, filter): """Append a filter to the filters list.""" if (filter): self.filters.append(filter) def append_normalisation_filter(self): """Append a normalisation audio filter to the complex filter.""" if (self.has_audio): self.append_filter("[aconc] dynaudnorm=r=0.25:f=10:b=y [anorm]") def append_concat_filter(self, frame_type, segments=[]): """Append a concat filter to the filters list""" # Ignore frame type. if frame_type in ["a", "v"]: if (len(segments) > 1): self.append_filter( "{inspecs} concat=n={n}:v={v}:a={a} [{t}conc]".format( inspecs=" ".join([s.output_stream_specifier() for s in segments]), n=len(segments), v=int(frame_type == "v"), a=int(frame_type == "a"), t=frame_type)) elif (len(segments) == 1): self.append_filter( "{inspec} {a}null [{t}conc]".format( inspec=segments[0].output_stream_specifier(), a=frame_type if frame_type == "a" else "", t=frame_type)) def build_complex_filter(self): """Build the complete complex filter. Filters in the filtergraph are separated by ";". """ return "{f}".format(f=";".join(self.filters)) def argument_string(self, quote=False): """Return the list of arguments as a string.""" args = (self._base_options + self.input_options + ["-filter_complex", self.build_complex_filter()] + self.output_options) if quote: return " ".join([ShellCommand.shellquote(a) for a in args]) else: return " ".join(args) def argument_list(self): """Return a combined list of all arguments.""" return (self._base_options + self.input_options + ["-filter_complex", self.build_complex_filter()] + self.output_options) def process_pattern(self, pat): """Respond to a pexpect pattern. Return True on EOF.""" if (pat == 1): elapsed = datetime.timedelta( hours=int(self.process.match.group(1)), minutes=int(self.process.match.group(2)), seconds=float(self.process.match.group(3))) self.progress.update(elapsed.total_seconds()) return (pat == 0) if (__name__ == "__main__"): print(ShellCommand()) print(ConvertCommand(input_options=["in.pdf[12]"], output_options=["out.png"])) # FFprobeCommand expects the input file to exist. f = tempfile.NamedTemporaryFile() print(FFprobeCommand(input_options=["-i", f.name])) f.close() print(FFmpegCommand(input_options=["-i", "in.mov"], output_options=["out.mov"])) concat = FFmpegConcatCommand(input_options=["-i", "in.mov"], output_options=["out.mov"], has_audio=True) concat.append_normalisation_filter() print(concat) print("Quoting:") for s in ["foobar", "foo bar baz", "foo(bar)", "[foobar]", "foo[bar", "foo 'bar'", '"foobar"', "'foobar'", 'foo"bar', "foo.bar", "(", ")", "'", "/foo/bar/baz/quux", "-f", "--foobar"]: print(" {s} => echo {sub}".format(s=s, sub=ShellCommand.shellquote(s)))
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