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Psychotoxical
a4c400cc69
M4A files store the iTunSMPB value behind a 16-byte binary 'data' atom header. The previous parser took bytes directly after the ASCII key, landing in the binary header and producing a corrupted parts array (total_valid=348 instead of ~13M samples), which caused take_duration to exhaust the source in ~8ms — silent no-playback. Fix: search for the " 00000000 " sentinel within 128 bytes of the key to locate the actual value string, falling back to the old offset for ID3v2/MP3 files where no binary header exists. Also patches symphonia-format-isomp4 (local crate under patches/) to: - Tolerate SL descriptor predefined=0x01 (older iTunes M4A) - Convert descriptor.unwrap() panic to a proper decode error - Gracefully skip malformed trak atoms (e.g. MJPEG cover-art streams) instead of failing the entire probe Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
42 lines
1.1 KiB
Rust
42 lines
1.1 KiB
Rust
// Symphonia
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// Copyright (c) 2019-2022 The Project Symphonia Developers.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at https://mozilla.org/MPL/2.0/.
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use symphonia_core::errors::{decode_error, Result};
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use symphonia_core::io::ReadBytes;
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use crate::atoms::{Atom, AtomHeader};
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/// Movie extends header atom.
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#[allow(dead_code)]
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#[derive(Debug)]
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pub struct MehdAtom {
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/// Atom header.
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header: AtomHeader,
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/// Fragment duration.
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pub fragment_duration: u64,
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}
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impl Atom for MehdAtom {
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fn header(&self) -> AtomHeader {
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self.header
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}
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fn read<B: ReadBytes>(reader: &mut B, header: AtomHeader) -> Result<Self> {
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let (version, _) = AtomHeader::read_extra(reader)?;
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let fragment_duration = match version {
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0 => u64::from(reader.read_be_u32()?),
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1 => reader.read_be_u64()?,
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_ => {
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return decode_error("isomp4: invalid mehd version");
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}
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};
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Ok(MehdAtom { header, fragment_duration })
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}
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}
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