Source code for eyed3.plugins.lameinfo

import math
from eyed3.utils import formatSize
from eyed3.utils.console import printMsg, getTtySize
from eyed3.plugins import LoaderPlugin


class LameInfoPlugin(LoaderPlugin):
    NAMES = ["lameinfo", "xing"]
    SUMMARY = "Outputs lame header (if one exists) for file."
    DESCRIPTION = (
        "The 'lame' (or xing) header provides extra information about the mp3 "
        "that is useful to players and encoders but not officially part of "
        "the mp3 specification. Variable bit rate mp3s, for example, use this "
        "header.\n\n"
        "For more details see `here <http://gabriel.mp3-tech.org/mp3infotag.html>`_"
       )

    def printHeader(self, file_path):
        w = getTtySize()[1]
        printMsg(self._getFileHeader(file_path, w))
        printMsg(self._getHardRule(w))

    def handleFile(self, f, *_, **__):
        super().handleFile(f)
        if self.audio_file is None:
            return

        self.printHeader(f)
        if (self.audio_file.info is None
                or not self.audio_file.info.lame_tag):
            printMsg("No LAME Tag")
            return

        lt = self.audio_file.info.lame_tag
        if "infotag_crc" not in lt:
            try:
                printMsg(f"Encoder Version: {lt['encoder_version']}")
            except KeyError:
                pass
            return

        values = [("Encoder Version", lt['encoder_version']),
                  ("LAME Tag Revision", lt['tag_revision']),
                  ("VBR Method", lt['vbr_method']),
                  ("Lowpass Filter", lt['lowpass_filter']),
                  ]

        if "replaygain" in lt:
            try:
                peak = lt["replaygain"]["peak_amplitude"]
                db = 20 * math.log10(peak)
                val = "%.8f (%+.1f dB)" % (peak, db)
                values.append(("Peak Amplitude", val))
            except KeyError:
                pass
            for type_ in ["radio", "audiofile"]:
                try:
                    gain = lt["replaygain"][type_]
                    name = "%s Replay Gain" % gain['name'].capitalize()
                    val = "%s dB (%s)" % (gain['adjustment'],
                                          gain['originator'])
                    values.append((name, val))
                except KeyError:
                    pass

        values.append(("Encoding Flags", " ".join((lt["encoding_flags"]))))
        if lt["nogap"]:
            values.append(("No Gap", " and ".join(lt["nogap"])))
        values.append(("ATH Type", lt["ath_type"]))
        values.append(("Bitrate (%s)" % lt["bitrate"][1], lt["bitrate"][0]))
        values.append(("Encoder Delay", "%s samples" % lt["encoder_delay"]))
        values.append(("Encoder Padding", "%s samples" % lt["encoder_padding"]))
        values.append(("Noise Shaping", lt["noise_shaping"]))
        values.append(("Stereo Mode", lt["stereo_mode"]))
        values.append(("Unwise Settings", lt["unwise_settings"]))
        values.append(("Sample Frequency", lt["sample_freq"]))
        values.append(("MP3 Gain", "%s (%+.1f dB)" % (lt["mp3_gain"],
                                                      lt["mp3_gain"] * 1.5)))
        values.append(("Preset", lt["preset"]))
        values.append(("Surround Info", lt["surround_info"]))
        values.append(("Music Length", "%s" % formatSize(lt["music_length"])))
        values.append(("Music CRC-16", "%04X" % lt["music_crc"]))
        values.append(("LAME Tag CRC-16", "%04X" % lt["infotag_crc"]))

        for v in values:
            printMsg(f"{v[0]:<20}: {v[1]}")