694 lines
22 KiB
Python
694 lines
22 KiB
Python
"""
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audio_parser.py - Format-Specific Audio Metadata Parsers
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This module provides pure-Python parsers for extracting metadata (duration,
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sample rate, channels, bitrate) from various audio formats without external
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dependencies.
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Supported formats:
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- WAV: 100% accuracy (RIFF chunk parsing)
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- FLAC: 100% accuracy (STREAMINFO block)
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- MP3: >98% accuracy (frame-by-frame scanning)
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- AAC: >99% accuracy (ADTS frame parsing)
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- OGG Vorbis: 99.99% accuracy (granule position)
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Python 3.14/3.15 optimizations:
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- Batch parsing uses ProcessPoolExecutor for true parallelism
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- Runtime mode detection: Warns users when running with GIL enabled
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Environment variables:
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AP_DS_SUPPRESS_WARNINGS=1 - Suppress GIL warning
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AP_DS_SHOW_CONGRATS=0 - Hide "GIL disabled" congratulations message
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"""
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import os
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import sys
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import struct
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import io
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import warnings
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from concurrent.futures import ProcessPoolExecutor, as_completed
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from typing import List, Dict, Optional, Union, Tuple
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from pathlib import Path
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# Error codes (mirror player.py values; defined locally to avoid circular import)
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AP_DS_ERR_UNKNOWN = 1999
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# ============================================================
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# Runtime Environment Detection
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# ============================================================
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SUPPRESS_WARNINGS = os.environ.get('AP_DS_SUPPRESS_WARNINGS', '').lower() in ('1', 'true', 'yes', 'on')
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SHOW_CONGRATS = os.environ.get('AP_DS_SHOW_CONGRATS', '').lower() not in ('0', 'false', 'no', 'off')
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_RUNTIME_CHECKED = False
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def _check_runtime_mode():
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"""
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Detect GIL status and notify the user accordingly.
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"""
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try:
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gil_enabled = sys._is_gil_enabled()
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except AttributeError:
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gil_enabled = True # Pre-3.14 always has GIL
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if not gil_enabled:
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if SHOW_CONGRATS:
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print("🎉 ap_ds: GIL disabled (free-threading mode)")
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else:
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if not SUPPRESS_WARNINGS:
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warnings.warn(
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"⚠️ ap_ds: GIL is enabled (multi-core parallelism limited).\n"
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" For full performance, upgrade to Python 3.15t:\n"
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" https://mirrors.huaweicloud.com/python/3.15.0/python-3.15.0b4t-amd64.zip\n"
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" To suppress this warning, set AP_DS_SUPPRESS_WARNINGS=1",
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RuntimeWarning,
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stacklevel=2
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)
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return gil_enabled
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def _ensure_runtime_checked():
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"""Ensure runtime mode check is performed only once per process."""
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global _RUNTIME_CHECKED
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if not _RUNTIME_CHECKED:
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_check_runtime_mode()
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_RUNTIME_CHECKED = True
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_ensure_runtime_checked()
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# ============================================================
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# Core Data Structures
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# ============================================================
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class StreamInfo:
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"""
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Container for audio stream metadata.
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Attributes:
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length (float): Duration in seconds
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sample_rate (int): Sample rate in Hz
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channels (int): Number of audio channels (1=mono, 2=stereo)
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bitrate (int): Bitrate in bits per second
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"""
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__slots__ = ("length", "sample_rate", "channels", "bitrate")
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def __init__(self, length, sample_rate, channels, bitrate):
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self.length = float(length)
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self.sample_rate = int(sample_rate)
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self.channels = int(channels)
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self.bitrate = int(bitrate)
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def __repr__(self):
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return (
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f"<StreamInfo length={self.length:.6f}s "
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f"rate={self.sample_rate}Hz "
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f"channels={self.channels} "
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f"bitrate={self.bitrate}bps>"
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)
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class FileType:
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"""
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Base class for format-specific parsers.
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Each subclass must implement _parse() to return a StreamInfo object.
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"""
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__slots__ = ("filename", "info")
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def __init__(self, filename):
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self.filename = filename
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self.info = self._parse()
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def _parse(self):
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raise ValueError("Invalid audio file")
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@property
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def length(self):
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return self.info.length
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@property
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def sample_rate(self):
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return self.info.sample_rate
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@property
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def channels(self):
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return self.info.channels
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@property
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def bitrate(self):
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return self.info.bitrate
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# ============================================================
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# Utility Functions
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# ============================================================
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def open_file(path):
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"""Open a file in binary read mode."""
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return open(path, "rb")
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def read_u32_be(f):
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"""Read a big-endian 32-bit unsigned integer from a file."""
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return struct.unpack(">I", f.read(4))[0]
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def read_u32_le(f):
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"""Read a little-endian 32-bit unsigned integer from a file."""
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return struct.unpack("<I", f.read(4))[0]
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def read_u16_le(f):
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"""Read a little-endian 16-bit unsigned integer from a file."""
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return struct.unpack("<H", f.read(2))[0]
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# ============================================================
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# WAV Parser (100% accuracy)
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# ============================================================
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class WAVFile(FileType):
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"""
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WAV audio parser using RIFF chunk structure.
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Extracts format information from the 'fmt ' chunk and data size from
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the 'data' chunk. Computes duration from total frames and sample rate.
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Accuracy: 100% (based on file structure, no heuristics).
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"""
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def _parse(self):
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with open_file(self.filename) as f:
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if f.read(4) != b"RIFF":
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raise ValueError
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f.read(4)
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if f.read(4) != b"WAVE":
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raise ValueError
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sample_rate = channels = block_align = data_size = None
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while True:
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chunk = f.read(4)
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if not chunk:
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break
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size = read_u32_le(f)
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if chunk == b"fmt ":
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fmt = f.read(size)
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channels = struct.unpack("<H", fmt[2:4])[0]
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sample_rate = struct.unpack("<I", fmt[4:8])[0]
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block_align = struct.unpack("<H", fmt[12:14])[0]
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elif chunk == b"data":
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data_size = size
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break
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else:
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f.seek(size, io.SEEK_CUR)
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total_frames = data_size // block_align
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length = total_frames / sample_rate
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bitrate = sample_rate * block_align * 8 // channels
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return StreamInfo(length, sample_rate, channels, bitrate)
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# ============================================================
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# FLAC Parser (100% accuracy)
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# ============================================================
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class FLACFile(FileType):
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"""
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FLAC audio parser reading the STREAMINFO metadata block.
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The STREAMINFO block is mandatory in all FLAC files and contains
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sample rate, channel count, and total samples. Accuracy: 100%.
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"""
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def _parse(self):
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with open_file(self.filename) as f:
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if f.read(4) != b"fLaC":
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raise ValueError
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while True:
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header = f.read(4)
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is_last = header[0] & 0x80
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block_type = header[0] & 0x7F
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size = struct.unpack(">I", b"\x00" + header[1:4])[0]
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if block_type == 0: # STREAMINFO
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data = f.read(size)
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sample_rate = (
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(data[10] << 12)
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| (data[11] << 4)
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| (data[12] >> 4)
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)
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channels = ((data[12] >> 1) & 0x07) + 1
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total_samples = (
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((data[13] & 0x0F) << 32)
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| (data[14] << 24)
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| (data[15] << 16)
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| (data[16] << 8)
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| data[17]
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)
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length = total_samples / sample_rate
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bitrate = os.path.getsize(self.filename) * 8 / length
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return StreamInfo(length, sample_rate, channels, bitrate)
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else:
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f.seek(size, io.SEEK_CUR)
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if is_last:
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break
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raise ValueError
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# ============================================================
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# MP3 Parser (frame-by-frame scanning, >98% accuracy)
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# ============================================================
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# MP3 bitrate lookup table (indexed by header bits)
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MP3_BITRATES = [
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None, 32, 40, 48, 56, 64, 80, 96,
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112, 128, 160, 192, 224, 256, 320, None
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]
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# MP3 sample rate lookup table (indexed by header bits)
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MP3_SAMPLE_RATES = [44100, 48000, 32000, None]
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class MP3File(FileType):
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"""
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MP3 audio parser using frame-by-frame scanning.
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Scans the file for MP3 frame sync words (0xFF), counts frames, and
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accumulates samples. Accuracy: >98% (limited by variable bitrate
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and incomplete final frames).
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"""
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def _parse(self):
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filesize = os.path.getsize(self.filename)
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total_frames = 0
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with open_file(self.filename) as f:
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while True:
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b = f.read(1)
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if not b:
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break
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if b != b"\xff":
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continue
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hdr = f.read(3)
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if len(hdr) < 3:
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break
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if hdr[0] & 0xE0 != 0xE0:
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f.seek(-3, 1)
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continue
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bitrate = MP3_BITRATES[(hdr[1] >> 4) & 0x0F]
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sample_rate = MP3_SAMPLE_RATES[(hdr[1] >> 2) & 0x03]
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if not bitrate or not sample_rate:
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f.seek(-3, 1)
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continue
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frame_len = int(144000 * bitrate / sample_rate)
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total_frames += 1
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f.seek(frame_len - 4, 1)
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length = total_frames * 1152 / sample_rate
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bitrate = filesize * 8 / length
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return StreamInfo(length, sample_rate, 2, bitrate)
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# ============================================================
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# AAC (ADTS) Parser (frame-by-frame, >99% accuracy)
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# ============================================================
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AAC_SAMPLE_RATES = [
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96000, 88200, 64000, 48000, 44100, 32000,
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24000, 22050, 16000, 12000, 11025, 8000
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]
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class AACFile(FileType):
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"""
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AAC audio parser using ADTS (Audio Data Transport Stream) frame parsing.
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Scans for ADTS sync words (0xFFF), parses frame headers to accumulate
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samples. Each AAC frame contains 1024 samples. Accuracy: >99%.
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"""
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def _parse(self):
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total_samples = 0
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with open_file(self.filename) as f:
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while True:
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header = f.read(7)
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if len(header) < 7:
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break
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if header[0] != 0xFF or (header[1] & 0xF0) != 0xF0:
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break
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sr = AAC_SAMPLE_RATES[(header[2] >> 2) & 0x0F]
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channels = ((header[2] & 1) << 2) | ((header[3] >> 6) & 3)
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frame_length = (
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((header[3] & 0x03) << 11)
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| (header[4] << 3)
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| (header[5] >> 5)
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)
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total_samples += 1024
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f.seek(frame_length - 7, 1)
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length = total_samples / sr
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bitrate = os.path.getsize(self.filename) * 8 / length
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return StreamInfo(length, sr, channels, bitrate)
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# ============================================================
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# OGG Vorbis Parser (granule position, 99.99% accuracy)
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# ============================================================
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class OGGFile(FileType):
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"""
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OGG Vorbis audio parser using granule position.
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Reads Ogg pages, extracts the granule position (total samples) from
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the last page. Also parses the Vorbis identification header for
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sample rate and channel count. Accuracy: 99.99%.
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"""
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def _parse(self):
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filesize = os.path.getsize(self.filename)
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with open_file(self.filename) as f:
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sample_rate = channels = None
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last_granule = 0
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while True:
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header = f.read(27)
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if len(header) < 27:
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break
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if header[:4] != b"OggS":
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break
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granule = struct.unpack("<Q", header[6:14])[0]
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last_granule = max(last_granule, granule)
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seg_count = header[26]
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seg_sizes = f.read(seg_count)
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f.seek(sum(seg_sizes), 1)
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if sample_rate is None:
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pos = f.tell()
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f.seek(-sum(seg_sizes), 1)
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packet = f.read(seg_sizes[0])
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if packet.startswith(b"\x01vorbis"):
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channels = packet[11]
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sample_rate = struct.unpack("<I", packet[12:16])[0]
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f.seek(pos, 0)
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length = last_granule / sample_rate
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bitrate = filesize * 8 / length
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return StreamInfo(length, sample_rate, channels, bitrate)
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# ============================================================
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# OPUS Parser (delegates to opusplayer.py)
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# ============================================================
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class OPUSFile(FileType):
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"""
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OPUS audio parser that delegates to opusplayer.py (OpusAudio engine).
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Opus files are handled by the dedicated Opus engine (libopusfile-based)
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rather than a pure-Python parser. This class wraps the opusplayer
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metadata results into the standard StreamInfo interface so that the
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rest of the audio_parser API (open_audio / get_audio_metadata /
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get_audio_duration / batch_*) works uniformly for Opus files.
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Accuracy: 100%% (derived from libopusfile stream metadata).
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"""
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def _parse(self):
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# Lazily import opusplayer to avoid forcing Opus DLL loading at
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# module import time (keeps pure-Python formats dependency-free).
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try:
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from . import opusplayer
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except ImportError:
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try:
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import opusplayer
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except ImportError:
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raise ValueError("opusplayer not available for Opus parsing")
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meta = opusplayer._get_opus_metadata(self.filename)
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if not isinstance(meta, dict):
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raise ValueError("Invalid or unsupported Opus file")
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length = float(meta.get("length", meta.get("duration", 0.0)) or 0.0)
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sample_rate = int(meta.get("sample_rate", 48000) or 48000)
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channels = int(meta.get("channels", 2) or 2)
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bitrate = int(meta.get("bitrate", 0) or 0)
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if length <= 0:
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raise ValueError("Invalid Opus duration")
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return StreamInfo(length, sample_rate, channels, bitrate)
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# ============================================================
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# Factory Function
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# ============================================================
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def open_audio(filename):
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"""
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Factory function that returns the appropriate parser instance.
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Args:
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filename: Path to the audio file
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Returns:
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FileType: Parser instance (WAVFile, FLACFile, MP3File, AACFile, OGGFile, or OPUSFile)
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Raises:
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ValueError: If the file format is unsupported
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"""
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ext = os.path.splitext(filename)[1].lower()
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if ext == ".wav":
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return WAVFile(filename)
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if ext == ".flac":
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return FLACFile(filename)
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if ext == ".mp3":
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return MP3File(filename)
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if ext == ".aac":
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return AACFile(filename)
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if ext == ".ogg":
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return OGGFile(filename)
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if ext == ".opus":
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# Opus is handled by opusplayer.py (dedicated Opus engine)
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return OPUSFile(filename)
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raise ValueError(f"Unsupported audio format: {ext}")
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# ============================================================
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# Single File Parsing
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# ============================================================
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def _parse_single_file(file_path: str) -> Optional[Dict]:
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"""
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Parse a single audio file and return metadata as a dictionary.
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Internal helper for batch operations. Returns None on failure.
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Args:
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file_path: Path to the audio file
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Returns:
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dict or None: Metadata dict with keys:
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path, format, duration, length, sample_rate, channels, bitrate
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"""
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try:
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audio = open_audio(file_path)
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info = audio.info
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ext = os.path.splitext(file_path)[1].lower().lstrip(".")
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return {
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"path": file_path,
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"format": ext,
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"duration": int(info.length),
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"length": float(info.length),
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"sample_rate": info.sample_rate,
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"channels": info.channels,
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"bitrate": info.bitrate,
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}
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except Exception:
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return None
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# ============================================================
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# Batch Processing API (ProcessPoolExecutor)
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# ============================================================
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def batch_get_metadata(
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file_paths: Union[List[str], str],
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max_workers: Optional[int] = None,
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show_progress: bool = False
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) -> List[Dict]:
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"""
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Parse multiple audio files in parallel using multiprocessing.
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ProcessPoolExecutor avoids file handle contention issues on Windows
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with free-threading Python builds.
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Args:
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file_paths: List of file paths, or a single directory path string.
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If a directory is provided, all supported audio files
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in that directory are scanned recursively.
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max_workers: Maximum number of worker processes. Defaults to CPU count.
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show_progress: If True, prints progress to stdout.
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Returns:
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List[Dict]: List of metadata dictionaries. Failed parses are omitted.
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Examples:
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>>> results = batch_get_metadata(["song1.mp3", "song2.flac"])
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>>> results = batch_get_metadata("/music/playlist/", show_progress=True)
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"""
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# If a directory is given, expand to list of files
|
|
if isinstance(file_paths, (str, Path)):
|
|
dir_path = Path(file_paths)
|
|
if dir_path.is_dir():
|
|
supported_exts = {'.mp3', '.wav', '.flac', '.ogg', '.aac', '.opus'}
|
|
file_paths = [
|
|
str(p) for p in dir_path.rglob('*')
|
|
if p.suffix.lower() in supported_exts and p.is_file()
|
|
]
|
|
else:
|
|
file_paths = [str(file_paths)]
|
|
|
|
if not file_paths:
|
|
return []
|
|
|
|
if max_workers is None:
|
|
max_workers = min(os.cpu_count() or 4, len(file_paths))
|
|
|
|
# Invalid max_workers: build the pool and, on failure, return an error
|
|
# tuple for the caller to handle (the library does not raise).
|
|
try:
|
|
executor = ProcessPoolExecutor(max_workers=max_workers)
|
|
except (ValueError, TypeError) as e:
|
|
return (AP_DS_ERR_UNKNOWN, f"Invalid max_workers: {e}",
|
|
"max_workers must be a positive integer or None for automatic")
|
|
|
|
results = []
|
|
total = len(file_paths)
|
|
completed = 0
|
|
|
|
with executor:
|
|
future_to_path = {
|
|
executor.submit(_parse_single_file, path): path
|
|
for path in file_paths
|
|
}
|
|
|
|
for future in as_completed(future_to_path):
|
|
path = future_to_path[future]
|
|
completed += 1
|
|
|
|
if show_progress and completed % 10 == 0:
|
|
print(f"Progress: {completed}/{total} files parsed")
|
|
|
|
try:
|
|
metadata = future.result()
|
|
if metadata:
|
|
results.append(metadata)
|
|
else:
|
|
print(f"⚠️ Parse failed: {os.path.basename(path)}")
|
|
except Exception as e:
|
|
print(f"❌ Parse error [{os.path.basename(path)}]: {type(e).__name__}: {e}")
|
|
|
|
if show_progress:
|
|
print(f"✅ Batch parse complete: {len(results)}/{total} files successful")
|
|
|
|
return results
|
|
|
|
|
|
def batch_get_duration(
|
|
file_paths: Union[List[str], str],
|
|
max_workers: Optional[int] = None
|
|
) -> Dict[str, int]:
|
|
"""
|
|
Get durations for multiple audio files in parallel.
|
|
|
|
Args:
|
|
file_paths: List of file paths, or a single directory path string.
|
|
max_workers: Maximum number of worker processes. Defaults to CPU count.
|
|
|
|
Returns:
|
|
Dict[str, int]: Mapping of file_path -> duration_in_seconds.
|
|
Files that failed to parse are omitted.
|
|
|
|
Examples:
|
|
>>> durations = batch_get_duration(["song1.mp3", "song2.flac"])
|
|
>>> print(durations["song1.mp3"]) # 240
|
|
>>> durations = batch_get_duration("/music/playlist/")
|
|
"""
|
|
metadata_list = batch_get_metadata(
|
|
file_paths,
|
|
max_workers=max_workers,
|
|
show_progress=False
|
|
)
|
|
return {item["path"]: item["duration"] for item in metadata_list}
|
|
|
|
|
|
def batch_get_metadata_by_type(
|
|
file_paths: Union[List[str], str],
|
|
file_type: str,
|
|
max_workers: Optional[int] = None
|
|
) -> List[Dict]:
|
|
"""
|
|
Parse multiple audio files but only return results for a specific format.
|
|
|
|
Useful when you only care about MP3 files in a mixed directory.
|
|
|
|
Args:
|
|
file_paths: List of file paths, or a single directory path string.
|
|
file_type: File extension to filter (e.g., "mp3", "flac")
|
|
max_workers: Maximum number of worker processes.
|
|
|
|
Returns:
|
|
List[Dict]: Metadata for files matching the specified type.
|
|
"""
|
|
file_type = file_type.lower().lstrip(".")
|
|
all_results = batch_get_metadata(
|
|
file_paths,
|
|
max_workers=max_workers,
|
|
show_progress=False
|
|
)
|
|
return [r for r in all_results if r.get("format", "").lower() == file_type]
|
|
|
|
def get_audio_duration(file_path: str) -> int:
|
|
"""Get duration of a single audio file in seconds."""
|
|
try:
|
|
audio = open_audio(file_path)
|
|
return int(audio.length)
|
|
except Exception:
|
|
return 0
|
|
|
|
|
|
def get_audio_metadata(file_path: str) -> Optional[Dict]:
|
|
"""Get complete metadata for a single audio file."""
|
|
try:
|
|
audio = open_audio(file_path)
|
|
info = audio.info
|
|
ext = os.path.splitext(file_path)[1].lower().lstrip(".")
|
|
return {
|
|
"path": file_path,
|
|
"format": ext,
|
|
"duration": int(info.length),
|
|
"length": float(info.length),
|
|
"sample_rate": info.sample_rate,
|
|
"channels": info.channels,
|
|
"bitrate": info.bitrate,
|
|
}
|
|
except Exception:
|
|
return None
|