• Added support for default stream numbers on the command line (in the form filename:0). Includes a custom argparse action handler to split the stream number from the filename. NOTE: not fully tested! (closes #11)

nigel.stanger / process_podcast

Browse code • Added support for default stream numbers on the command line (in the form filename:0). Includes a custom argparse action handler to split the stream number from the filename. NOTE: not fully tested! (closes #11) Python2.7 master LAST_2.7_RELEASE
1 parent bd9827b commit 4993b6eac753c51182f1f00650d58ab01da325f0 Nigel Stanger authored on 24 Aug 2016

Patch

Showing 1 changed file

Ignore Space Show notes View process_podcast.py
#!/usr/bin/env python import argparse import datetime import logging import os.path import sys from pyparsing import ParseResults import globals from config_parser import ( parse_configuration_file, parse_configuration_string) from shell_command import (FFprobeCommand, FFmpegConcatCommand) from segment import (Segment, AudioSegment, VideoSegment, FrameSegment) class InputStreamAction(argparse.Action): def __call__(self, parser, namespace, values, option_string=None): input = values.split(":") file = input[0] stream = None if (len(input) == 1) else input[1] setattr(namespace, self.dest, file) if (option_string in ["--audio", "-a"]): setattr(namespace, 'audio_stream_number', stream) elif (option_string in ["--video", "-v"]): setattr(namespace, 'video_stream_number', stream) def parse_command_line(): """Parse command line arguments.""" parser = argparse.ArgumentParser( usage="%(prog)s [options] <output>", description="where: <output> is the name of the output file " "(note: .mov is generally best)", epilog="Default input streams can be specified using either of " "--audio or --video. If neither of these are specified, " "then you must supply a configuration file using --config. " "(Of course, you can always supply a configuration file " "regardless.)\n\n" "Input streams can be taken from the same input file.\n\n" "If no segments are specified, the entire input stream is " "processed as one segment. The number and duration of segments " "can differ, but all input streams must have the same the total " "length.") parser.add_argument( "output", help="name of the output file (note: .mov is best)") parser.add_argument( "--audio", "-a", metavar="FILE", action=InputStreamAction, help="File name for the default audio input stream (can be the " "same as other input streams). Only the first audio stream " "in the file is read unless you specify otherwise in a " "configuration file.") parser.add_argument( "--configuration", "--config", "-c", dest="config", metavar="FILE", help="File name for the podcast segment configuration (plain text). " "Run {p} --help-config for details on the file " "format.".format(p=globals.PROGRAM)) parser.add_argument( "--debug", "-d", action="store_true", help="Print debugging output (overrides --quiet).") parser.add_argument( "--keep", "-k", action="store_true", help="Don't delete any generated temporary files.") parser.add_argument( "--quiet", "-q", action="store_true", help="Mute all console output (overridden by --debug).") parser.add_argument( "--video", "-v", metavar="FILE", action=InputStreamAction, help="File name for the default video input stream (can be the " "same as other input streams). Only the first video stream " "in the file is read unless you specify otherwise in a " "configuration file.") args = parser.parse_args() return args def print_config_help(): """Print details of the configuration file format.""" print "Help is coming." sys.exit(0) def check_arguments(args): """Sanity check the command line arguments.""" fn = "check_arguments" # if (args.help_config): # print_config_help() if (args.quiet): globals.log.setLevel(logging.WARNING) # --debug overrides --quiet. if (args.debug): globals.log.setLevel(logging.DEBUG) globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args)) # Must specify at least one of --audio, --video, --config. if (not any([args.audio, args.video, args.config])): globals.log.error("must specify at least one of --audio, --video, " "or --config") sys.exit(1) def get_configuration(args): # Fill in missing file names for default input streams. fn = "get_configuration" type_mapping = { "audio": {"file": args.audio, "stream": args.audio_stream_number}, "video": {"file": args.video, "stream": args.video_stream_number}} globals.log.info("Processing configuration...") if (args.config): config = parse_configuration_file(args.config) # Check that applicable default input streams have been specified. for i, c in enumerate(config): type = c["type"] if (type in type_mapping): file = type_mapping[type]["file"] stream = type_mapping[type]["stream"] # No filename in configuration. if (not c["filename"]): if (file): config[i]["filename"] = file # No filename on command line either. else: globals.log.error( "attempting to use default {s} input stream, but " "--{s} hasn't been specified".format(s=type)) sys.exit(1) # No stream number in configuration. Note: 0 is a valid # stream number, so explicitly check for None. if (c["num"] is None): # Assume 0 if no stream on command line either. config[i]["num"] = 0 if stream is None else stream else: conf_list = [] for m in type_mapping: file = type_mapping[m]["file"] stream = type_mapping[m]["stream"] if (file and stream is not None): conf_list += [ "[{type}:{file}:{stream}]".format(type=m, file=file, stream=stream)] globals.log.debug("{fn}(): default config = " "{c}".format(fn=fn, c=conf_list)) config = parse_configuration_string("\n".join(conf_list)) return config def get_file_duration(file): """Calculate the duration a media file as a timedelta object.""" command = FFprobeCommand( ["-show_entries", "format=duration", "-print_format", "default=noprint_wrappers=1:nokey=1", file]) ss, ms = command.get_output().strip().split(".") ms = ms[:3].ljust(3, "0") return datetime.timedelta(seconds=int(ss), milliseconds=int(ms)) def make_new_segment(type, filename, punch_in, punch_out, num): """Make a new segment instance of the correct class.""" fn = "make_new_segment" globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type)) globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename)) globals.log.debug("{fn}(): punch in = {i}s".format(fn=fn, i=punch_in)) globals.log.debug("{fn}(): punch out = {o}s".format(fn=fn, o=punch_out)) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num)) if (type == "audio"): return AudioSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "video"): return VideoSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "frame"): return FrameSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) else: return None def process_timestamp_pair(times): """Constructs timedelta instances from a pair of config timestamps.""" fn = "process_timestamp_pair" globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=times[0])) globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=times[1])) # If the first item in the timestamp list in the configuration file # is a filename, the parser inserts a zero timestamp before it. We # can therefore guarantee that the first item of the pair will # always be a timestamp. t0 = datetime.timedelta( hours=times[0]["hh"], minutes=times[0]["mm"], seconds=times[0]["ss"], milliseconds=times[0]["ms"]) if (isinstance(times[1], str)): t1 = t0 + get_file_duration(times[1]) elif (isinstance(times[1], ParseResults)): t1 = datetime.timedelta( hours=times[1]["hh"], minutes=times[1]["mm"], seconds=times[1]["ss"], milliseconds=times[1]["ms"]) else: globals.log.error("unreadable timestamp {t}".format(t=times[1])) return t0, t1 def process_time_list(type, filename, num, time_list): """Process an audio or video stream and build a list of segments.""" if (os.path.exists(filename)): stream_duration = get_file_duration(filename) else: stream_duration = 0 segments = [] # No timestamps: punch in at 0, out at stream duration. if (len(time_list) == 0): punch_in = datetime.timedelta() punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) else: # Process each pair of timestamps as punch in, out. If there's # an odd number of items, the last one is processed separately. for t in zip(time_list[::2], time_list[1::2]): punch_in, punch_out = process_timestamp_pair(t) if (punch_in == punch_out): globals.log.warning( "punch in ({i}s) and punch out ({o}s) times are " "equal; no segment will be " "generated".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) continue elif (punch_out < punch_in): globals.log.error( "punch out time ({i}s) falls before punch in time " "({o}s); can't generate a valid " "segment".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) sys.exit(1) segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) # Odd number of timestamps: punch in at last timestamp, # out at stream duration. if (len(time_list) % 2 != 0): punch_in, _ = process_timestamp_pair([time_list[-1], None]) punch_out = stream_duration - punch_in segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) return segments def process_input_streams(config): """Process a list of stream specification and build a list of segments.""" fn = "process_input_streams" globals.log.info("Processing input streams...") segments = [] for cnf in config: globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"])) globals.log.debug( "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"])) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"])) globals.log.debug("{fn}(): times = t".format(fn=fn, t=cnf["times"])) segments += process_time_list(cnf["type"], cnf["filename"], cnf["num"], cnf["times"]) return segments def render_podcast(segments, output): """Stitch together the various input components into the final podcast.""" fn = "render_podcast" globals.log.info("Rendering final podcast...") command = FFmpegConcatCommand() input_files = Segment.input_files() for f in input_files: if (input_files[f]): command.append_input_options(input_files[f]) command.append_input_options(["-i", f]) for s in segments: if (not isinstance(s, FrameSegment)): command.append_filter(s.trim_filter()) command.append_concat_filter( "a", [s for s in segments if isinstance(s, AudioSegment)]) command.append_normalisation_filter() command.append_concat_filter( "v", [s for s in segments if isinstance(s, VideoSegment)]) command.append_output_options([output]) globals.log.debug("{fn}(): {c}".format(fn=fn, c=command)) command.run() def cleanup(segments): """Clean up generated temporary files.""" globals.log.info("Cleaning up...") for s in segments: s.delete_temp_files() def main(): fn = "main" logging.basicConfig( level=logging.INFO, format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM)) args = parse_command_line() check_arguments(args) config = get_configuration(args) segments = process_input_streams(config) globals.log.debug("{fn}(): audio segments = {a}".format( fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)])) globals.log.debug("{fn}(): audio segments = {v}".format( fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)])) audio_duration = sum([s.get_duration() for s in segments if isinstance(s, AudioSegment)]) video_duration = sum([s.get_duration() for s in segments if isinstance(s, VideoSegment)]) globals.log.debug("{fn}(): audio duration = " "{a}".format(fn=fn, a=audio_duration)) globals.log.debug("{fn}(): video duration = " "{v}".format(fn=fn, v=video_duration)) if (audio_duration != video_duration): globals.log.warning("total video duration ({v}s) doesn't match " "total audio duration " "({a}s)".format(v=video_duration, a=audio_duration)) # Set up frame segments that refer to the previous segment. for f in [s for s in segments if isinstance(s, FrameSegment)]: globals.log.debug("{fn}(): frame (before) = {b}".format(fn=fn, b=f)) if (f.input_file == "^"): if (f.segment_number > 0): prev = segments[f.segment_number - 1] globals.log.debug("{fn}(): prev = {p}".format(fn=fn, p=prev)) prev.generate_temp_file(args.output) f.use_frame(prev.generate_last_frame(args.output)) globals.log.debug("{fn}(): frame (after) = " "{a}".format(fn=fn, a=f)) else: globals.log.error("frame segment {s} is attempting to use the last frame " "of a non-existent previous " "segment".format(s=f.segment_number)) sys.exit(1) globals.log.debug("{fn}(): input files = " "{i}".format(fn=fn, i=Segment.input_files())) try: render_podcast(segments, args.output) if (not args.keep): cleanup(segments) except (KeyboardInterrupt): pass if (__name__ == "__main__"): main() #!/usr/bin/env python import argparse import datetime import logging import os.path import sys from pyparsing import ParseResults import globals from config_parser import ( parse_configuration_file, parse_configuration_string) from shell_command import (FFprobeCommand, FFmpegConcatCommand) from segment import (Segment, AudioSegment, VideoSegment, FrameSegment) def parse_command_line(): """Parse command line arguments.""" parser = argparse.ArgumentParser( usage="%(prog)s [options] <output>", description="where: <output> is the name of the output file " "(note: .mov is generally best)", epilog="Default input streams can be specified using either of " "--audio or --video. If neither of these are specified, " "then you must supply a configuration file using --config. " "(Of course, you can always supply a configuration file " "regardless.)\n\n" "Input streams can be taken from the same input file.\n\n" "If no segments are specified, the entire input stream is " "processed as one segment. The number and duration of segments " "can differ, but all input streams must have the same the total " "length.") parser.add_argument( "output", help="name of the output file (note: .mov is best)") parser.add_argument( "--audio", "-a", metavar="FILE", help="File name for the default audio input stream (can be the " "same as other input streams). Only the first audio stream " "in the file is read unless you specify otherwise in a " "configuration file.") parser.add_argument( "--configuration", "--config", "-c", dest="config", metavar="FILE", help="File name for the podcast segment configuration (plain text). " "Run {p} --help-config for details on the file " "format.".format(p=globals.PROGRAM)) parser.add_argument( "--debug", "-d", action="store_true", help="Print debugging output (overrides --quiet).") parser.add_argument( "--keep", "-k", action="store_true", help="Don't delete any generated temporary files.") parser.add_argument( "--quiet", "-q", action="store_true", help="Mute all console output (overridden by --debug).") parser.add_argument( "--video", "-v", metavar="FILE", help="File name for the default video input stream (can be the " "same as other input streams). Only the first video stream " "in the file is read unless you specify otherwise in a " "configuration file.") args = parser.parse_args() return args def print_config_help(): """Print details of the configuration file format.""" print "Help is coming." sys.exit(0) def check_arguments(args): """Sanity check the command line arguments.""" fn = "check_arguments" # if (args.help_config): # print_config_help() if (args.quiet): globals.log.setLevel(logging.WARNING) # --debug overrides --quiet. if (args.debug): globals.log.setLevel(logging.DEBUG) globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args)) # Must specify at least one of --audio, --video, --config. if (not any([args.audio, args.video, args.config])): globals.log.error("must specify at least one of --audio, --video, " "or --config") sys.exit(1) def get_configuration(args): # Fill in missing file names for default input streams. fn = "get_configuration" file_mapping = {"audio": args.audio, "video": args.video} globals.log.info("Processing configuration...") if (args.config): config = parse_configuration_file(args.config) # Check that applicable default input streams have been specified. for i, c in enumerate(config): if (not c["filename"]): if (file_mapping[c["type"]]): config[i]["filename"] = file_mapping[c["type"]] else: globals.log.error( "attempting to use default {s} input stream, but " "--{s} hasn't been specified".format(s=c["type"])) sys.exit(1) else: conf_list = ["[{type}:{file}:0]".format(type=m, file=file_mapping[m]) for m in file_mapping if file_mapping[m]] globals.log.debug("{fn}(): default config = " "{c}".format(fn=fn, c=conf_list)) config = parse_configuration_string("\n".join(conf_list)) return config def get_file_duration(file): """Calculate the duration a media file as a timedelta object.""" command = FFprobeCommand( ["-show_entries", "format=duration", "-print_format", "default=noprint_wrappers=1:nokey=1", file]) ss, ms = command.get_output().strip().split(".") ms = ms[:3].ljust(3, "0") return datetime.timedelta(seconds=int(ss), milliseconds=int(ms)) def make_new_segment(type, filename, punch_in, punch_out, num): """Make a new segment instance of the correct class.""" fn = "make_new_segment" globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type)) globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename)) globals.log.debug("{fn}(): punch in = {i}s".format(fn=fn, i=punch_in)) globals.log.debug("{fn}(): punch out = {o}s".format(fn=fn, o=punch_out)) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num)) if (type == "audio"): return AudioSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "video"): return VideoSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) elif (type == "frame"): return FrameSegment(file=filename, punch_in=punch_in, punch_out=punch_out, input_stream=num) else: return None def process_timestamp_pair(times): """Constructs timedelta instances from a pair of config timestamps.""" fn = "process_timestamp_pair" globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=times[0])) globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=times[1])) # If the first item in the timestamp list in the configuration file # is a filename, the parser inserts a zero timestamp before it. We # can therefore guarantee that the first item of the pair will # always be a timestamp. t0 = datetime.timedelta( hours=times[0]["hh"], minutes=times[0]["mm"], seconds=times[0]["ss"], milliseconds=times[0]["ms"]) if (isinstance(times[1], str)): t1 = t0 + get_file_duration(times[1]) elif (isinstance(times[1], ParseResults)): t1 = datetime.timedelta( hours=times[1]["hh"], minutes=times[1]["mm"], seconds=times[1]["ss"], milliseconds=times[1]["ms"]) else: globals.log.error("unreadable timestamp {t}".format(t=times[1])) return t0, t1 def process_time_list(type, filename, num, time_list): """Process an audio or video stream and build a list of segments.""" if (os.path.exists(filename)): stream_duration = get_file_duration(filename) else: stream_duration = 0 segments = [] # No timestamps: punch in at 0, out at stream duration. if (len(time_list) == 0): punch_in = datetime.timedelta() punch_out = stream_duration segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) else: # Process each pair of timestamps as punch in, out. If there's # an odd number of items, the last one is processed separately. for t in zip(time_list[::2], time_list[1::2]): punch_in, punch_out = process_timestamp_pair(t) if (punch_in == punch_out): globals.log.warning( "punch in ({i}s) and punch out ({o}s) times are " "equal; no segment will be " "generated".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) continue elif (punch_out < punch_in): globals.log.error( "punch out time ({i}s) falls before punch in time " "({o}s); can't generate a valid " "segment".format(i=punch_in.total_seconds(), o=punch_out.total_seconds())) sys.exit(1) segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) # Odd number of timestamps: punch in at last timestamp, # out at stream duration. if (len(time_list) % 2 != 0): punch_in, _ = process_timestamp_pair([time_list[-1], None]) punch_out = stream_duration - punch_in segments.append(make_new_segment(type, filename, punch_in, punch_out, num)) return segments def process_input_streams(config): """Process a list of stream specification and build a list of segments.""" fn = "process_input_streams" globals.log.info("Processing input streams...") segments = [] for cnf in config: globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"])) globals.log.debug( "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"])) globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"])) globals.log.debug("{fn}(): times = t".format(fn=fn, t=cnf["times"])) segments += process_time_list(cnf["type"], cnf["filename"], cnf["num"], cnf["times"]) return segments def render_podcast(segments, output): """Stitch together the various input components into the final podcast.""" fn = "render_podcast" globals.log.info("Rendering final podcast...") command = FFmpegConcatCommand() input_files = Segment.input_files() for f in input_files: if (input_files[f]): command.append_input_options(input_files[f]) command.append_input_options(["-i", f]) for s in segments: if (not isinstance(s, FrameSegment)): command.append_filter(s.trim_filter()) command.append_concat_filter( "a", [s for s in segments if isinstance(s, AudioSegment)]) command.append_normalisation_filter() command.append_concat_filter( "v", [s for s in segments if isinstance(s, VideoSegment)]) command.append_output_options([output]) globals.log.debug("{fn}(): {c}".format(fn=fn, c=command)) command.run() def cleanup(segments): """Clean up generated temporary files.""" globals.log.info("Cleaning up...") for s in segments: s.delete_temp_files() def main(): fn = "main" logging.basicConfig( level=logging.INFO, format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM)) args = parse_command_line() check_arguments(args) config = get_configuration(args) segments = process_input_streams(config) globals.log.debug("{fn}(): audio segments = {a}".format( fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)])) globals.log.debug("{fn}(): audio segments = {v}".format( fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)])) audio_duration = sum([s.get_duration() for s in segments if isinstance(s, AudioSegment)]) video_duration = sum([s.get_duration() for s in segments if isinstance(s, VideoSegment)]) globals.log.debug("{fn}(): audio duration = " "{a}".format(fn=fn, a=audio_duration)) globals.log.debug("{fn}(): video duration = " "{v}".format(fn=fn, v=video_duration)) if (audio_duration != video_duration): globals.log.warning("total video duration ({v}s) doesn't match " "total audio duration " "({a}s)".format(v=video_duration, a=audio_duration)) # Set up frame segments that refer to the previous segment. for f in [s for s in segments if isinstance(s, FrameSegment)]: globals.log.debug("{fn}(): frame (before) = {b}".format(fn=fn, b=f)) if (f.input_file == "^"): if (f.segment_number > 0): prev = segments[f.segment_number - 1] globals.log.debug("{fn}(): prev = {p}".format(fn=fn, p=prev)) prev.generate_temp_file(args.output) f.use_frame(prev.generate_last_frame(args.output)) globals.log.debug("{fn}(): frame (after) = " "{a}".format(fn=fn, a=f)) else: globals.log.error("frame segment {s} is attempting to use the last frame " "of a non-existent previous " "segment".format(s=f.segment_number)) sys.exit(1) globals.log.debug("{fn}(): input files = " "{i}".format(fn=fn, i=Segment.input_files())) try: render_podcast(segments, args.output) if (not args.keep): cleanup(segments) except (KeyboardInterrupt): pass if (__name__ == "__main__"): main()

Ignore Space Show notes View

process_podcast.py

#!/usr/bin/env python

import argparse
import datetime
import logging
import os.path
import sys

from pyparsing import ParseResults

import globals
from config_parser import (
    parse_configuration_file, parse_configuration_string)
from shell_command import (FFprobeCommand, FFmpegConcatCommand)
from segment import (Segment, AudioSegment, VideoSegment, FrameSegment)

class InputStreamAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        input = values.split(":")
        file = input[0]
        stream = None if (len(input) == 1) else input[1]
        setattr(namespace, self.dest, file)
        if (option_string in ["--audio", "-a"]):
            setattr(namespace, 'audio_stream_number', stream)
        elif (option_string in ["--video", "-v"]):
            setattr(namespace, 'video_stream_number', stream)

def parse_command_line():
    """Parse command line arguments."""
    parser = argparse.ArgumentParser(
        usage="%(prog)s [options] <output>",
        description="where: <output> is the name of the output file "
            "(note: .mov is generally best)",
        epilog="Default input streams can be specified using either of "
            "--audio or --video. If neither of these are specified, "
            "then you must supply a configuration file using --config. "
            "(Of course, you can always supply a configuration file "
            "regardless.)\n\n"
            "Input streams can be taken from the same input file.\n\n"
            "If no segments are specified, the entire input stream is "
            "processed as one segment. The number and duration of segments "
            "can differ, but all input streams must have the same the total "
            "length.")
    
    parser.add_argument(
        "output",
        help="name of the output file (note: .mov is best)")
    
    parser.add_argument(
        "--audio", "-a", metavar="FILE", action=InputStreamAction,
        help="File name for the default audio input stream (can be the "
            "same as other input streams). Only the first audio stream "
            "in the file is read unless you specify otherwise in a "
            "configuration file.")
    
    parser.add_argument(
        "--configuration", "--config", "-c", dest="config", metavar="FILE",
        help="File name for the podcast segment configuration (plain text). "
            "Run {p} --help-config for details on the file "
            "format.".format(p=globals.PROGRAM))
    
    parser.add_argument(
        "--debug", "-d", action="store_true",
        help="Print debugging output (overrides --quiet).")
    
    parser.add_argument(
        "--keep", "-k", action="store_true",
        help="Don't delete any generated temporary files.")
    
    parser.add_argument(
        "--quiet", "-q", action="store_true",
        help="Mute all console output (overridden by --debug).")

parser.add_argument(
        "--video", "-v", metavar="FILE", action=InputStreamAction,
        help="File name for the default video input stream (can be the "
            "same as other input streams). Only the first video stream "
            "in the file is read unless you specify otherwise in a "
            "configuration file.")
    
    args = parser.parse_args()
    
    return args

def print_config_help():
    """Print details of the configuration file format."""
    print "Help is coming."
    sys.exit(0)

def check_arguments(args):
    """Sanity check the command line arguments."""
    fn = "check_arguments"
#     if (args.help_config):
#         print_config_help()
    
    if (args.quiet):
        globals.log.setLevel(logging.WARNING)
        
    # --debug overrides --quiet.
    if (args.debug):
        globals.log.setLevel(logging.DEBUG)
        globals.log.debug("{fn}(): args = {a}".format(fn=fn, a=args))
    
    # Must specify at least one of --audio, --video, --config.
    if (not any([args.audio, args.video, args.config])):
        globals.log.error("must specify at least one of --audio, --video, "
                          "or --config")
        sys.exit(1)

def get_configuration(args):
    # Fill in missing file names for default input streams.
    fn = "get_configuration"
    type_mapping = {
        "audio": {"file": args.audio, "stream": args.audio_stream_number},
        "video": {"file": args.video, "stream": args.video_stream_number}}
    globals.log.info("Processing configuration...")
    if (args.config):
        config = parse_configuration_file(args.config)
        # Check that applicable default input streams have been specified.
        for i, c in enumerate(config):
            type = c["type"]
            if (type in type_mapping):
                file = type_mapping[type]["file"]
                stream = type_mapping[type]["stream"]
                # No filename in configuration.
                if (not c["filename"]):
                    if (file):
                        config[i]["filename"] = file
                    # No filename on command line either.
                    else:
                        globals.log.error(
                            "attempting to use default {s} input stream, but "
                            "--{s} hasn't been specified".format(s=type))
                        sys.exit(1)
                # No stream number in configuration. Note: 0 is a valid
                # stream number, so explicitly check for None.
                if (c["num"] is None):
                    # Assume 0 if no stream on command line either.
                    config[i]["num"] = 0 if stream is None else stream
    else:
        conf_list = []
        for m in type_mapping:
            file = type_mapping[m]["file"]
            stream = type_mapping[m]["stream"]
            if (file and stream is not None):
                conf_list += [
                    "[{type}:{file}:{stream}]".format(type=m, file=file,
                                                      stream=stream)]
        globals.log.debug("{fn}(): default config = "
                          "{c}".format(fn=fn, c=conf_list))
        config = parse_configuration_string("\n".join(conf_list))
    
    return config

def get_file_duration(file):
    """Calculate the duration a media file as a timedelta object."""
    command = FFprobeCommand(
        ["-show_entries", "format=duration",
         "-print_format", "default=noprint_wrappers=1:nokey=1",
        file])
    ss, ms = command.get_output().strip().split(".")
    ms = ms[:3].ljust(3, "0")
    return datetime.timedelta(seconds=int(ss), milliseconds=int(ms))

def make_new_segment(type, filename, punch_in, punch_out, num):
    """Make a new segment instance of the correct class."""
    fn = "make_new_segment"
    globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=type))
    globals.log.debug("{fn}(): filename = {f}".format(fn=fn, f=filename))
    globals.log.debug("{fn}(): punch in = {i}s".format(fn=fn, i=punch_in))
    globals.log.debug("{fn}(): punch out = {o}s".format(fn=fn, o=punch_out))
    globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=num))
    
    if (type == "audio"):
        return AudioSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, input_stream=num)
    elif (type == "video"):
        return VideoSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, input_stream=num)
    elif (type == "frame"):
        return FrameSegment(file=filename, punch_in=punch_in,
                            punch_out=punch_out, input_stream=num)
    else:
        return None

def process_timestamp_pair(times):
    """Constructs timedelta instances from a pair of config timestamps."""
    fn = "process_timestamp_pair"
    globals.log.debug("{fn}(): t0 = {t}".format(fn=fn, t=times[0]))
    globals.log.debug("{fn}(): t1 = {t}".format(fn=fn, t=times[1]))
    
    # If the first item in the timestamp list in the configuration file
    # is a filename, the parser inserts a zero timestamp before it. We
    # can therefore guarantee that the first item of the pair will
    # always be a timestamp.
    t0 = datetime.timedelta(
        hours=times[0]["hh"], minutes=times[0]["mm"],
        seconds=times[0]["ss"], milliseconds=times[0]["ms"])
    if (isinstance(times[1], str)):
        t1 = t0 + get_file_duration(times[1])
    elif (isinstance(times[1], ParseResults)):
        t1 = datetime.timedelta(
            hours=times[1]["hh"], minutes=times[1]["mm"],
            seconds=times[1]["ss"], milliseconds=times[1]["ms"])
    else:
        globals.log.error("unreadable timestamp {t}".format(t=times[1]))
    
    return t0, t1

def process_time_list(type, filename, num, time_list):
    """Process an audio or video stream and build a list of segments."""
    if (os.path.exists(filename)):
        stream_duration = get_file_duration(filename)
    else:
        stream_duration = 0
    segments = []
    
    # No timestamps: punch in at 0, out at stream duration.
    if (len(time_list) == 0):
        punch_in = datetime.timedelta()
        punch_out = stream_duration
        segments.append(make_new_segment(type, filename, punch_in,
                                         punch_out, num))
    else:
        # Process each pair of timestamps as punch in, out. If there's
        # an odd number of items, the last one is processed separately.
        for t in zip(time_list[::2], time_list[1::2]):
            punch_in, punch_out = process_timestamp_pair(t)
            if (punch_in == punch_out):
                globals.log.warning(
                    "punch in ({i}s) and punch out ({o}s) times are "
                    "equal; no segment will be "
                    "generated".format(i=punch_in.total_seconds(),
                                       o=punch_out.total_seconds()))
                continue
            elif (punch_out < punch_in):
                globals.log.error(
                    "punch out time ({i}s) falls before punch in time "
                    "({o}s); can't generate a valid "
                    "segment".format(i=punch_in.total_seconds(),
                                     o=punch_out.total_seconds()))
                sys.exit(1)
            segments.append(make_new_segment(type, filename, punch_in,
                                             punch_out, num))
    
    # Odd number of timestamps: punch in at last timestamp,
    # out at stream duration.
    if (len(time_list) % 2 != 0):
        punch_in, _ = process_timestamp_pair([time_list[-1], None])
        punch_out = stream_duration - punch_in
        segments.append(make_new_segment(type, filename, punch_in,
                                         punch_out, num))
    return segments

def process_input_streams(config):
    """Process a list of stream specification and build a list of segments."""
    fn = "process_input_streams"
    globals.log.info("Processing input streams...")
    segments = []
    for cnf in config:
        globals.log.debug("{fn}(): type = {t}".format(fn=fn, t=cnf["type"]))
        globals.log.debug(
            "{fn}(): filename = {f}".format(fn=fn, f=cnf["filename"]))
        globals.log.debug("{fn}(): num = {n}".format(fn=fn, n=cnf["num"]))
        globals.log.debug("{fn}(): times = t".format(fn=fn, t=cnf["times"]))
    
        segments += process_time_list(cnf["type"], cnf["filename"],
                                      cnf["num"], cnf["times"])  
    return segments

def render_podcast(segments, output):
    """Stitch together the various input components into the final podcast."""
    fn = "render_podcast"
    globals.log.info("Rendering final podcast...")
    command = FFmpegConcatCommand()
    input_files = Segment.input_files()
    for f in input_files:
        if (input_files[f]):
            command.append_input_options(input_files[f])
        command.append_input_options(["-i", f])
    for s in segments:
        if (not isinstance(s, FrameSegment)):
            command.append_filter(s.trim_filter())
    command.append_concat_filter(
        "a", [s for s in segments if isinstance(s, AudioSegment)])
    command.append_normalisation_filter()
    command.append_concat_filter(
        "v", [s for s in segments if isinstance(s, VideoSegment)])
    command.append_output_options([output])
    globals.log.debug("{fn}(): {c}".format(fn=fn, c=command))
    command.run()

def cleanup(segments):
    """Clean up generated temporary files."""
    globals.log.info("Cleaning up...")
    for s in segments:
        s.delete_temp_files()

def main():
    fn = "main"
    logging.basicConfig(
        level=logging.INFO,
        format="%(levelname)s: {p}: %(message)s".format(p=globals.PROGRAM))
    
    args = parse_command_line()
    check_arguments(args)
    
    config = get_configuration(args)
    
    segments = process_input_streams(config)
    globals.log.debug("{fn}(): audio segments = {a}".format(
        fn=fn, a=[s for s in segments if isinstance(s, AudioSegment)]))
    globals.log.debug("{fn}(): audio segments = {v}".format(
        fn=fn, v=[s for s in segments if isinstance(s, VideoSegment)]))
    
    audio_duration = sum([s.get_duration() for s in segments
                          if isinstance(s, AudioSegment)])
    video_duration = sum([s.get_duration() for s in segments
                          if isinstance(s, VideoSegment)])
    globals.log.debug("{fn}(): audio duration = "
                      "{a}".format(fn=fn, a=audio_duration))
    globals.log.debug("{fn}(): video duration = "
                      "{v}".format(fn=fn, v=video_duration))
    
    if (audio_duration != video_duration):
        globals.log.warning("total video duration ({v}s) doesn't match "
                    "total audio duration "
                    "({a}s)".format(v=video_duration, a=audio_duration))
    
    # Set up frame segments that refer to the previous segment.
    for f in [s for s in segments if isinstance(s, FrameSegment)]:
        globals.log.debug("{fn}(): frame (before) = {b}".format(fn=fn, b=f))
        if (f.input_file == "^"):
            if (f.segment_number > 0):
                prev = segments[f.segment_number - 1]
                globals.log.debug("{fn}(): prev = {p}".format(fn=fn, p=prev))
                prev.generate_temp_file(args.output)
                f.use_frame(prev.generate_last_frame(args.output))
                globals.log.debug("{fn}(): frame (after) = "
                                  "{a}".format(fn=fn, a=f))
            else:
                globals.log.error("frame segment {s} is attempting to use the last frame "
                          "of a non-existent previous "
                          "segment".format(s=f.segment_number))
                sys.exit(1)
    
    globals.log.debug("{fn}(): input files = "
                      "{i}".format(fn=fn, i=Segment.input_files()))
    
    try:
        render_podcast(segments, args.output)
        if (not args.keep):
            cleanup(segments)
    except (KeyboardInterrupt):
        pass

if (__name__ == "__main__"):
    main()

#!/usr/bin/env python

import argparse
import datetime
import logging
import os.path
import sys

from pyparsing import ParseResults

def parse_command_line():
    """Parse command line arguments."""
    parser = argparse.ArgumentParser(
        usage="%(prog)s [options] <output>",
        description="where: <output> is the name of the output file "
            "(note: .mov is generally best)",
        epilog="Default input streams can be specified using either of "
            "--audio or --video. If neither of these are specified, "
            "then you must supply a configuration file using --config. "
            "(Of course, you can always supply a configuration file "
            "regardless.)\n\n"
            "Input streams can be taken from the same input file.\n\n"
            "If no segments are specified, the entire input stream is "
            "processed as one segment. The number and duration of segments "
            "can differ, but all input streams must have the same the total "
            "length.")
    
    parser.add_argument(
        "output",
        help="name of the output file (note: .mov is best)")
    
    parser.add_argument(
        "--audio", "-a", metavar="FILE",
        help="File name for the default audio input stream (can be the "
            "same as other input streams). Only the first audio stream "
            "in the file is read unless you specify otherwise in a "
            "configuration file.")
    
    parser.add_argument(
        "--configuration", "--config", "-c", dest="config", metavar="FILE",
        help="File name for the podcast segment configuration (plain text). "
            "Run {p} --help-config for details on the file "
            "format.".format(p=globals.PROGRAM))
    
    parser.add_argument(
        "--debug", "-d", action="store_true",
        help="Print debugging output (overrides --quiet).")
    
    parser.add_argument(
        "--keep", "-k", action="store_true",
        help="Don't delete any generated temporary files.")
    
    parser.add_argument(
        "--quiet", "-q", action="store_true",
        help="Mute all console output (overridden by --debug).")

parser.add_argument(
        "--video", "-v", metavar="FILE",
        help="File name for the default video input stream (can be the "
            "same as other input streams). Only the first video stream "
            "in the file is read unless you specify otherwise in a "
            "configuration file.")
    
    args = parser.parse_args()
    
    return args

def print_config_help():
    """Print details of the configuration file format."""
    print "Help is coming."
    sys.exit(0)

def get_configuration(args):
    # Fill in missing file names for default input streams.
    fn = "get_configuration"
    file_mapping = {"audio": args.audio, "video": args.video}
    globals.log.info("Processing configuration...")
    if (args.config):
        config = parse_configuration_file(args.config)
        # Check that applicable default input streams have been specified.
        for i, c in enumerate(config):
            if (not c["filename"]):
                if (file_mapping[c["type"]]):
                    config[i]["filename"] = file_mapping[c["type"]]
                else:
                    globals.log.error(
                        "attempting to use default {s} input stream, but "
                        "--{s} hasn't been specified".format(s=c["type"]))
                    sys.exit(1)    
    else:
        conf_list = ["[{type}:{file}:0]".format(type=m, file=file_mapping[m])
                     for m in file_mapping if file_mapping[m]]
        globals.log.debug("{fn}(): default config = "
                          "{c}".format(fn=fn, c=conf_list))
        config = parse_configuration_string("\n".join(conf_list))
    
    return config

def cleanup(segments):
    """Clean up generated temporary files."""
    globals.log.info("Cleaning up...")
    for s in segments:
        s.delete_temp_files()

if (__name__ == "__main__"):
    main()

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