Browse / github.com/storytold/soundcraft / patch
Audio import: reconstruct AAC rate and channels with gapless trimming

Audio import: reconstruct AAC rate and channels with gapless trimming High-efficiency Advanced Audio Coding (AAC) imports currently expose the core rate/channel layout, causing wrong duration, lost stereo reconstruction, and rejected six-channel material. This draft uses pinned scalar `rusty_aac` 1.1.1 with default features disabled for AAC packets; Symphonia continues demuxing and handling other formats. Probing and decoding agree on the actual reconstructed rate, channel count and duration. It also applies ordinary single-entry `.mp4` edit-list trimming and Apple priming metadata at the reconstructed rate. Bounded sample checks, fallible output reservation, m
Status: open
Score: 0.00
Adopters: 0 other operators
Author: jackcanon (imported from pull request #814, open)
Base: e8940766d77601942b31e62570a06c44db1ec68e
Size: +487 −15 in 18 files
Review: pending
Shared: 2026-10-28
Id: fe253f0d9a35323c7bb7f013
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raw · ATTRIBUTION.md Cargo.lock crates/audio-io/Cargo.toml crates/audio-io/src/aac.rs crates/audio-io/src/lib.rs crates/audio-io/src/mp4.rs crates/audio-io/src/pcm.rs crates/audio-io/src/symph.rs crates/audio-io/tests/aac_profiles.rs crates/audio-io/tests/fixtures/README.md crates/audio-io/tests/fixtures/aac-51.m4a crates/audio-io/tests/fixtures/he-v1.m4a crates/audio-io/tests/fixtures/he-v2.m4a crates/audio-io/tests/fixtures/lc-stereo.aac crates/audio-io/tests/fixtures/lc-stereo.m4a crates/audio-io/tests/malformed.rs crates/engine/src/io.rs docs/file-format-parity.md
diff --git a/ATTRIBUTION.md b/ATTRIBUTION.md--- a/ATTRIBUTION.md+++ b/ATTRIBUTION.md@@ -15,6 +15,11 @@ the SoundCraft contributors) is listed under Files below.  ## Audio +`crates/audio-io/tests/fixtures/` contains original synthetic tones generated by Codex for Jack+and encoded with macOS Audio File Convert or FFmpeg. The source recipe is in that folder's+README.md. These test fixtures are licensed MIT OR Apache-2.0, like this project; no third-party+recordings or proprietary sample content are included.+ The demo session's audio (drums, bass, pad) and its MIDI parts are synthesised in code in `crates/engine/src/demo.rs` by the SoundCraft contributors (MIT OR Apache-2.0). No sample files are bundled.@@ -29,6 +34,7 @@ and, at runtime, the operating system's own UI fonts when available (never redis  | Path | Author | Source | License | |---|---|---|---|+| `crates/audio-io/tests/fixtures/` | Codex for Jack | Original generated test tones; recipe in folder | MIT OR Apache-2.0 | | `docs/brand/artcraft-logo.svg` | ArtCraft Team | craftrules `assets/brand/` | ArtCraft brand terms (`docs/brand/LICENSE-brand.txt`) | | `docs/brand/artcraft-logo.png` | ArtCraft Team | craftrules `assets/brand/` | ArtCraft brand terms | | `docs/brand/artcraft-logo-white.svg` | ArtCraft Team | craftrules `assets/brand/` | ArtCraft brand terms |diff --git a/Cargo.lock b/Cargo.lock--- a/Cargo.lock+++ b/Cargo.lock@@ -3321,6 +3321,12 @@ dependencies = [  "wait-timeout", ] +[[package]]+name = "rusty_aac"+version = "1.1.1"+source = "registry+https://github.com/rust-lang/crates.io-index"+checksum = "9408128402e729f7f5b71f05870198b9140bcb597e6e09dddc75f1272f7aec48"+ [[package]] name = "same-file" version = "1.0.6"@@ -3604,6 +3610,7 @@ version = "0.10.0" dependencies = [  "log",  "proptest",+ "rusty_aac",  "serde",  "serde_json",  "symphonia",diff --git a/crates/audio-io/Cargo.toml b/crates/audio-io/Cargo.toml--- a/crates/audio-io/Cargo.toml+++ b/crates/audio-io/Cargo.toml@@ -12,6 +12,7 @@ serde.workspace = true thiserror.workspace = true log.workspace = true symphonia.workspace = true+rusty_aac = { version = "=1.1.1", default-features = false }  [dev-dependencies] proptest.workspace = truediff --git a/crates/audio-io/src/aac.rs b/crates/audio-io/src/aac.rsnew file mode 100644--- /dev/null+++ b/crates/audio-io/src/aac.rs@@ -0,0 +1,117 @@+//! AAC packets from Symphonia's demuxer, decoded with SBR/PS and multichannel support.+//! The scalar-only dependency has no native runtime or unsafe acceleration enabled.++use symphonia::core::{codecs::CodecParameters, errors::Error as SymError, formats::FormatReader, units::TimeBase};++use crate::{AudioBuffer, AudioError, AudioInfo, Result, pcm::check_decode_samples};++fn decoder_error(error: rusty_aac::Error) -> AudioError {+    match error {+        rusty_aac::Error::Unsupported(message) => AudioError::Unsupported(format!("AAC: {message}")),+        other => AudioError::Malformed(format!("AAC: {other}")),+    }+}++/// Container trim counts use its time base, which may be the AAC core's rate.+fn trim_frames(trim: u32, time_base: TimeBase, output_rate: u32) -> Result<usize> {+    if time_base.denom == 0 || time_base.numer == 0 {+        return Err(AudioError::Malformed("AAC has an invalid time base".into()));+    }+    let frames = u128::from(trim) * u128::from(time_base.numer) * u128::from(output_rate) / u128::from(time_base.denom);+    usize::try_from(frames).map_err(|_| AudioError::TooLarge("AAC trim exceeds addressable memory".into()))+}++pub(crate) fn run(+    mut reader: Box<dyn FormatReader>,+    params: &CodecParameters,+    track: u32,+    mut info: AudioInfo,+    count_only: bool,+) -> Result<(AudioInfo, AudioBuffer)> {+    let mut decoder = match params.extra_data.as_deref() {+        Some(config) => rusty_aac::AacDecoder::with_config_bytes(config).map_err(decoder_error)?,+        None => {+            let channels = params.channels.map(|c| c.count()).unwrap_or(usize::from(info.channels));+            // ADTS demuxing supplies the standard AAC configuration's channel count.+            let configuration = match channels {+                1..=6 => channels as u16,+                8 => 7,+                _ => return Err(AudioError::Unsupported("AAC requires a supported channel configuration".into())),+            };+            rusty_aac::AacDecoder::with_config(rusty_aac::AudioSpecificConfig {+                object_type: 2,+                sample_rate: info.sample_rate,+                channels: configuration,+            })+        }+    };+    let time_base = params.time_base.unwrap_or(TimeBase { numer: 1, denom: info.sample_rate });+    let mut planar: Vec<Vec<f32>> = Vec::new();+    let mut frames = 0u64;+    let mut format = None;+    loop {+        let packet = match reader.next_packet() {+            Ok(packet) => packet,+            Err(SymError::IoError(error)) if error.kind() == std::io::ErrorKind::UnexpectedEof => break,+            Err(error) => return Err(AudioError::Malformed(format!("AAC container: {error}"))),+        };+        if packet.track_id() != track {+            continue;+        }+        let decoded = decoder.decode(packet.buf(), None).map_err(decoder_error)?;+        let channels = usize::from(decoded.channels);+        if decoded.sample_rate == 0 || !(1..=8).contains(&channels) || !decoded.samples.len().is_multiple_of(channels) {+            return Err(AudioError::Malformed("AAC decoder returned an invalid audio layout".into()));+        }+        let current = (decoded.sample_rate, decoded.channels);+        if format.is_some_and(|previous| previous != current) {+            return Err(AudioError::Unsupported("AAC changes sample rate or channel layout within the stream".into()));+        }+        if format.is_none() {+            format = Some(current);+            info.sample_rate = decoded.sample_rate;+            info.channels = decoded.channels;+            if !count_only {+                planar = (0..channels).map(|_| Vec::new()).collect();+            }+        }+        let start = trim_frames(packet.trim_start(), time_base, decoded.sample_rate)?;+        let end_trim = trim_frames(packet.trim_end(), time_base, decoded.sample_rate)?;+        let n = decoded.frames();+        let end = n+            .checked_sub(end_trim)+            .filter(|&end| start <= end)+            .ok_or_else(|| AudioError::Malformed("AAC packet trim exceeds decoded frames".into()))?;+        frames = frames.checked_add((end - start) as u64).ok_or_else(|| AudioError::TooLarge("AAC frame count overflow".into()))?;+        check_decode_samples(frames, decoded.channels, decoded.sample_rate)?;+        if !count_only {+            for dst in &mut planar {+                dst.try_reserve(end - start).map_err(|_| AudioError::TooLarge("not enough memory to decode AAC".into()))?;+            }+            let samples =+                decoded.samples.get(start * channels..end * channels).ok_or_else(|| AudioError::Malformed("AAC trim is out of range".into()))?;+            for frame in samples.chunks_exact(channels) {+                for (dst, &sample) in planar.iter_mut().zip(frame) {+                    dst.push(if sample.is_finite() { sample } else { 0.0 });+                }+            }+        }+    }+    if format.is_none() {+        return Err(AudioError::Malformed("AAC stream contains no audio packets".into()));+    }+    info.frames = frames;+    Ok((info.clone(), AudioBuffer { sample_rate: info.sample_rate, channels: planar }))+}++#[cfg(test)]+mod tests {+    use super::*;++    #[test]+    fn trims_follow_the_output_rate_and_reject_invalid_time_bases() {+        assert_eq!(trim_frames(512, TimeBase { numer: 1, denom: 24_000 }, 48_000).unwrap(), 1024);+        assert_eq!(trim_frames(1024, TimeBase { numer: 1, denom: 48_000 }, 48_000).unwrap(), 1024);+        assert!(trim_frames(1, TimeBase { numer: 1, denom: 0 }, 48_000).is_err());+    }+}diff --git a/crates/audio-io/src/lib.rs b/crates/audio-io/src/lib.rs--- a/crates/audio-io/src/lib.rs+++ b/crates/audio-io/src/lib.rs@@ -14,6 +14,7 @@ //!   of any length never has to fit in memory. #![deny(clippy::unwrap_used, clippy::expect_used, clippy::panic, clippy::unimplemented, clippy::todo, clippy::unreachable)] +mod aac; mod aiff; mod buffer; mod caf;diff --git a/crates/audio-io/src/mp4.rs b/crates/audio-io/src/mp4.rs--- a/crates/audio-io/src/mp4.rs+++ b/crates/audio-io/src/mp4.rs@@ -104,3 +104,222 @@ fn sample_sizes(b: &[u8], body: usize, end: usize) -> Result<bool> {     }     Ok(fits) }++// Edit-list support adapted from MarekSpodBiedry's SoundCraft pull request #713,+// commit 4a6228af98d3533c932a91ee1d667e347af94d8b, under this project's MIT/Apache-2.0 license.+/// The part of a decoded MP4 audio track that the file's edit list keeps, in frames at the+/// track's sample rate. AAC streams start with encoder delay that only the edit list excludes.+#[derive(Debug, Clone, Copy, PartialEq, Eq)]+pub(crate) struct Trim {+    /// Frames to drop from the start of the decoded stream.+    pub skip: u64,+    /// Frames to keep after those, or all that remain.+    pub len: Option<u64>,+}++impl Trim {+    /// Total frames left of a decoded stream of `total` frames.+    pub(crate) fn frames(self, total: u64) -> u64 {+        let rest = total.saturating_sub(self.skip);+        self.len.map_or(rest, |n| n.min(rest))+    }++    /// Cut every channel down to the kept frames.+    pub(crate) fn apply(self, channels: &mut [Vec<f32>]) {+        for ch in channels {+            let skip = usize::try_from(self.skip).unwrap_or(usize::MAX).min(ch.len());+            ch.drain(..skip);+            if let Some(n) = self.len {+                ch.truncate(usize::try_from(n).unwrap_or(usize::MAX));+            }+        }+    }+}++/// Child atoms in `pos..end` as (kind, body start, atom end). Stops at the first header that+/// does not fit.+fn children(b: &[u8], mut pos: usize, end: usize) -> Vec<([u8; 4], usize, usize)> {+    let end = end.min(b.len());+    let mut out = Vec::new();+    while pos < end {+        if out.len() >= 65_536 {+            break; // Metadata lookup must not allocate in proportion to an unbounded atom count.+        }+        let (Some(size), Some(kind)) = (be_u32(b, pos), crate::pcm::tag(b, pos + 4)) else { break };+        let (head, len) = match size {+            0 => (8, (end - pos) as u64),+            1 => (16, be_u64(b, pos + 8).unwrap_or(0)),+            n => (8, u64::from(n)),+        };+        let Some(atom_end) = usize::try_from(len).ok().filter(|_| len >= head).and_then(|n| pos.checked_add(n)).filter(|&n| n <= end) else { break };+        out.push((kind, pos + head as usize, atom_end));+        pos = atom_end;+    }+    out+}++/// The timescale of an `mvhd` or `mdhd` atom whose body starts at `body`.+fn timescale(b: &[u8], body: usize) -> Option<u64> {+    let at = match *b.get(body)? {+        0 => body.checked_add(12)?,+        1 => body.checked_add(20)?,+        _ => return None,+    };+    be_u32(b, at).filter(|&t| t > 0).map(u64::from)+}++/// `value` units of a clock running at `from` Hz, as frames at `rate` Hz.+fn rescale(value: u64, rate: u64, from: u64) -> Option<u64> {+    u64::try_from(u128::from(value) * u128::from(rate) / u128::from(from)).ok()+}++/// The frames kept by the edit list of the first sound track of the MP4 file `b`, for a track+/// decoded at `rate` Hz. None without a usable edit list: several entries, an empty edit, or a+/// cut that keeps everything.+pub(crate) fn edit_trim(b: &[u8], rate: u32) -> Option<Trim> {+    let rate = u64::from(rate);+    let moov = children(b, 0, b.len()).into_iter().find(|c| &c.0 == b"moov")?;+    let parts = children(b, moov.1, moov.2);+    let mvhd = parts.iter().find(|c| &c.0 == b"mvhd")?;+    let movie_scale = timescale(b.get(..mvhd.2)?, mvhd.1)?;+    for (_, trak, trak_end) in parts.iter().filter(|c| &c.0 == b"trak") {+        let kids = children(b, *trak, *trak_end);+        let mdia = kids.iter().find(|c| &c.0 == b"mdia")?;+        let media = children(b, mdia.1, mdia.2);+        let is_sound =+            media.iter().find(|c| &c.0 == b"hdlr").is_some_and(|h| b.get(..h.2).and_then(|b| crate::pcm::tag(b, h.1 + 8)) == Some(*b"soun"));+        if !is_sound {+            continue;+        }+        let mdhd = media.iter().find(|c| &c.0 == b"mdhd")?;+        let media_scale = timescale(b.get(..mdhd.2)?, mdhd.1)?;+        let edts = kids.iter().find(|c| &c.0 == b"edts")?;+        let elst = children(b, edts.1, edts.2).into_iter().find(|c| &c.0 == b"elst")?;+        let b = b.get(..elst.2)?;+        let body = elst.1;+        let wide = match *b.get(body)? {+            0 => false,+            1 => true,+            _ => return None,+        };+        if be_u32(b, body + 4)? != 1 {+            return None;+        }+        let (duration, start) = if wide {+            (be_u64(b, body + 8)?, i64::from_be_bytes(be_u64(b, body + 16)?.to_be_bytes()))+        } else {+            (u64::from(be_u32(b, body + 8)?), i64::from(i32::from_be_bytes(be_u32(b, body + 12)?.to_be_bytes())))+        };+        let media_rate = if wide { body + 24 } else { body + 16 };+        // Reverse, freeze and accelerated edits require timeline rendering, not a trim.+        if be_u32(b, media_rate)? != 0x0001_0000 {+            return None;+        }+        let skip = rescale(u64::try_from(start).ok()?, rate, media_scale)?;+        let len = if duration == 0 { None } else { Some(rescale(duration, rate, movie_scale)?) };+        return (skip > 0 || len.is_some()).then_some(Trim { skip, len });+    }+    None+}++/// Apple's encoder stores priming in iTunSMPB instead of an edit list. Its counts+/// use the media clock, which is the core rate for dual-rate HE-AAC.+pub(crate) fn itunes_trim(b: &[u8], rate: u32) -> Option<Trim> {+    let find = |pos, end, kind: &[u8; 4]| children(b, pos, end).into_iter().find(|c| &c.0 == kind);+    let moov = find(0, b.len(), b"moov")?;+    let mut sound = children(b, moov.1, moov.2).into_iter().filter(|c| &c.0 == b"trak").filter_map(|trak| {+        let mdia = find(trak.1, trak.2, b"mdia")?;+        let hdlr = find(mdia.1, mdia.2, b"hdlr")?;+        (crate::pcm::tag(b.get(..hdlr.2)?, hdlr.1 + 8)? == *b"soun").then_some(mdia)+    });+    let mdia = sound.next()?;+    if sound.next().is_some() {+        return None; // A global tag cannot identify which audio track it describes.+    }+    let mdhd = find(mdia.1, mdia.2, b"mdhd")?;+    let scale = timescale(b.get(..mdhd.2)?, mdhd.1)?;+    let udta = find(moov.1, moov.2, b"udta")?;+    let meta = find(udta.1, udta.2, b"meta")?;+    let ilst = find(meta.1.checked_add(4)?, meta.2, b"ilst")?;+    for item in children(b, ilst.1, ilst.2).into_iter().filter(|c| &c.0 == b"----") {+        let mean = find(item.1, item.2, b"mean")?;+        let name = find(item.1, item.2, b"name")?;+        if b.get(mean.1.checked_add(4)?..mean.2)? != b"com.apple.iTunes" || b.get(name.1.checked_add(4)?..name.2)? != b"iTunSMPB" {+            continue;+        }+        let data = find(item.1, item.2, b"data")?;+        let text = std::str::from_utf8(b.get(data.1.checked_add(8)?..data.2)?).ok()?;+        let mut fields = text.split_ascii_whitespace();+        let reserved = u64::from_str_radix(fields.next()?, 16).ok()?;+        let delay = u64::from_str_radix(fields.next()?, 16).ok()?;+        let _padding = u64::from_str_radix(fields.next()?, 16).ok()?;+        let length = u64::from_str_radix(fields.next()?, 16).ok()?;+        if reserved != 0 || length == 0 {+            return None;+        }+        return Some(Trim { skip: rescale(delay, u64::from(rate), scale)?, len: Some(rescale(length, u64::from(rate), scale)?) });+    }+    None+}++#[cfg(test)]+mod tests {+    use super::*;++    fn atom(kind: &[u8; 4], body: &[u8]) -> Vec<u8> {+        let mut v = ((body.len() + 8) as u32).to_be_bytes().to_vec();+        v.extend_from_slice(kind);+        v.extend_from_slice(body);+        v+    }++    fn header(scale: u32) -> Vec<u8> {+        let mut v = vec![0u8; 12];+        v.extend_from_slice(&scale.to_be_bytes());+        v.extend_from_slice(&[0; 8]);+        v+    }++    fn file(movie_scale: u32, media_scale: u32, entries: &[(u32, i32)]) -> Vec<u8> {+        let mut elst = vec![0, 0, 0, 0];+        elst.extend_from_slice(&(entries.len() as u32).to_be_bytes());+        for &(d, t) in entries {+            elst.extend_from_slice(&d.to_be_bytes());+            elst.extend_from_slice(&t.to_be_bytes());+            elst.extend_from_slice(&[0, 1, 0, 0]);+        }+        let mut hdlr = vec![0u8; 8];+        hdlr.extend_from_slice(b"soun");+        let mdia = [atom(b"hdlr", &hdlr), atom(b"mdhd", &header(media_scale))].concat();+        let trak = [atom(b"mdia", &mdia), atom(b"edts", &atom(b"elst", &elst))].concat();+        let moov = [atom(b"mvhd", &header(movie_scale)), atom(b"trak", &trak)].concat();+        [atom(b"ftyp", b"M4A \0\0\0\0"), atom(b"moov", &moov)].concat()+    }++    #[test]+    fn edit_list_drops_priming_and_padding() {+        let t = edit_trim(&file(48_000, 48_000, &[(48_000, 1024)]), 48_000);+        assert_eq!(t, Some(Trim { skip: 1024, len: Some(48_000) }));+        assert_eq!(t.map(|t| t.frames(49_152)), Some(48_000));+    }++    #[test]+    fn edit_list_scales_movie_and_media_clocks() {+        // A 1000 Hz movie clock (as ffmpeg writes) and a 44.1 kHz media clock.+        let t = edit_trim(&file(1000, 44_100, &[(1000, 2112)]), 44_100);+        assert_eq!(t, Some(Trim { skip: 2112, len: Some(44_100) }));+    }++    #[test]+    fn empty_or_split_edit_lists_are_ignored() {+        assert_eq!(edit_trim(&file(1000, 48_000, &[(500, -1)]), 48_000), None);+        assert_eq!(edit_trim(&file(1000, 48_000, &[(500, 0), (500, 100)]), 48_000), None);+    }++    #[test]+    fn trim_cuts_every_channel() {+        let mut ch = vec![vec![1.0, 2.0, 3.0, 4.0], vec![5.0, 6.0, 7.0, 8.0]];+        Trim { skip: 1, len: Some(2) }.apply(&mut ch);+        assert_eq!(ch, vec![vec![2.0, 3.0], vec![6.0, 7.0]]);+    }+}diff --git a/crates/audio-io/src/pcm.rs b/crates/audio-io/src/pcm.rs--- a/crates/audio-io/src/pcm.rs+++ b/crates/audio-io/src/pcm.rs@@ -7,6 +7,44 @@ use std::io::Write; /// Maximum number of decoded `f32` samples (all channels) we will produce: 4 GiB of output. pub(crate) const MAX_DECODE_SAMPLES: u64 = (4u64 << 30) / 4; +pub(crate) fn check_decode_samples(frames: u64, channels: u16, rate: u32) -> Result<()> {+    if frames.saturating_mul(u64::from(channels)) > MAX_DECODE_SAMPLES {+        return Err(decode_limit_error(frames, channels, rate));+    }+    Ok(())+}++/// Compressed file size is not the decoded allocation. Keep the guard and explain+/// what users can do, rather than suggesting an apparently small file is corrupt.+pub(crate) fn decode_limit_error(frames: u64, channels: u16, rate: u32) -> AudioError {+    let samples = frames.saturating_mul(u64::from(channels));+    let gib = samples as f64 * 4.0 / (1u64 << 30) as f64;+    let minutes = if rate == 0 { 0.0 } else { frames as f64 / f64::from(rate) / 60.0 };+    AudioError::TooLarge(format!(+        "{minutes:.1} minutes at {rate} Hz with {channels} channels requires {gib:.2} GiB of decoded audio; \+         the per-file decode limit is 4 GiB regardless of compressed file size. Split the source into shorter files before importing"+    ))+}++#[cfg(test)]+mod limit_tests {+    use super::*;++    #[test]+    fn large_compressed_import_error_explains_decoded_memory_and_recovery() {+        assert!(check_decode_samples(MAX_DECODE_SAMPLES / 2, 2, 48_000).is_ok());+        assert!(matches!(check_decode_samples(MAX_DECODE_SAMPLES / 2 + 1, 2, 48_000), Err(AudioError::TooLarge(_))));+        assert!(check_decode_samples(u64::MAX, u16::MAX, 48_000).is_err());+        let error = decode_limit_error(MAX_DECODE_SAMPLES / 2 + 1, 2, 48_000);+        assert!(matches!(error, AudioError::TooLarge(_)));+        let text = error.to_string();+        assert!(text.contains("4 GiB"));+        assert!(text.contains("compressed file size"));+        assert!(text.contains("Split the source"));+        assert!(decode_limit_error(u64::MAX, u16::MAX, 0).to_string().contains("decode limit"));+    }+}+ /// Little-endian `u16` at `pos`. pub(crate) fn le_u16(b: &[u8], pos: usize) -> Option<u16> {     let s = b.get(pos..pos.checked_add(2)?)?;diff --git a/crates/audio-io/src/symph.rs b/crates/audio-io/src/symph.rs--- a/crates/audio-io/src/symph.rs+++ b/crates/audio-io/src/symph.rs@@ -16,7 +16,7 @@ use symphonia::core::io::{MediaSourceStream, MediaSourceStreamOptions, ReadBytes use symphonia::core::meta::MetadataOptions; use symphonia::core::probe::Instantiate; -use crate::pcm::{MAX_DECODE_SAMPLES, be_u32};+use crate::pcm::{be_u32, check_decode_samples}; use crate::{AudioBuffer, AudioError, AudioInfo, FileFormat, Result, SampleFormat};  /// The most frames a packet may declare: decoders allocate a packet's frames up front, and ALAC@@ -160,11 +160,10 @@ fn run(bytes: &[u8], detected: FileFormat, count_only: bool) -> Result<(AudioInf         }     };     let (track_id, mut info) = info_of(reader.as_ref(), detected)?;-    if let Some(n) = reader.tracks().iter().find(|t| t.id == track_id).and_then(|t| t.codec_params.n_frames) {-        let total = n.saturating_mul(u64::from(info.channels.max(1)));-        if !count_only && total > MAX_DECODE_SAMPLES {-            return Err(AudioError::TooLarge(format!("{total} samples exceeds the decode limit")));-        }+    if let Some(n) = reader.tracks().iter().find(|t| t.id == track_id).and_then(|t| t.codec_params.n_frames)+        && !count_only+    {+        check_decode_samples(n, info.channels.max(1), info.sample_rate)?;     }     let params = reader         .tracks()@@ -176,6 +175,16 @@ fn run(bytes: &[u8], detected: FileFormat, count_only: bool) -> Result<(AudioInf     if params.max_frames_per_packet.into_iter().chain(alac.map(u64::from)).any(|n| n > MAX_PACKET_FRAMES) {         return Err(AudioError::Malformed("the file declares packets far longer than any codec uses".into()));     }+    if params.codec == CODEC_TYPE_AAC {+        let (mut info, mut audio) = crate::aac::run(reader, &params, track_id, info, count_only)?;+        if let Some(trim) = crate::mp4::edit_trim(bytes, info.sample_rate).or_else(|| crate::mp4::itunes_trim(bytes, info.sample_rate)) {+            info.frames = trim.frames(info.frames);+            if !count_only {+                trim.apply(&mut audio.channels);+            }+        }+        return Ok((info, audio));+    }     let mut decoder = symphonia::default::get_codecs().make(&params, &DecoderOptions::default()).map_err(map_err)?;      let mut planar: Vec<Vec<f32>> = Vec::new();@@ -216,16 +225,15 @@ fn run(bytes: &[u8], detected: FileFormat, count_only: bool) -> Result<(AudioInf         if ch == 0 {             continue;         }+        let channels = u16::try_from(ch).map_err(|_| AudioError::Unsupported("too many channels".into()))?;         if planar.is_empty() {             // The decoded stream is authoritative for the channel count.-            info.channels = u16::try_from(ch).map_err(|_| AudioError::Unsupported("too many channels".into()))?;+            info.channels = channels;             planar = (0..ch).map(|_| Vec::new()).collect();         }         let n = decoded.frames() as u64;         frames = frames.saturating_add(n);-        if frames.saturating_mul(ch as u64) > MAX_DECODE_SAMPLES {-            return Err(AudioError::TooLarge("decoded audio exceeds the 4 GiB limit".into()));-        }+        check_decode_samples(frames, channels, info.sample_rate)?;         if count_only {             continue;         }@@ -259,6 +267,11 @@ pub(crate) fn probe(bytes: &[u8], detected: FileFormat) -> Result<AudioInfo> {             Opened::Empty(info) => return Ok(info),         };         let (_, info) = info_of(reader.as_ref(), detected)?;+        if reader.tracks().iter().any(|t| t.codec_params.codec == CODEC_TYPE_AAC) {+            // AAC extensions may change rate and channels only when packets are decoded.+            // Header-only answers otherwise describe the core, not the audible stream.+            return run(bytes, detected, true).map(|(i, _)| i);+        }         if info.frames > 0 && info.channels > 0 {             return Ok(info);         }diff --git a/crates/audio-io/tests/aac_profiles.rs b/crates/audio-io/tests/aac_profiles.rsnew file mode 100644--- /dev/null+++ b/crates/audio-io/tests/aac_profiles.rs@@ -0,0 +1,43 @@+use soundcraft_audio_io::{decode, probe};++#[test]+fn aac_extensions_preserve_duration_rate_and_channels() {+    for (name, bytes, rate, channels) in [+        ("HE v1", include_bytes!("fixtures/he-v1.m4a").as_slice(), 32_000, 2),+        ("HE v2", include_bytes!("fixtures/he-v2.m4a").as_slice(), 48_000, 2),+        ("5.1", include_bytes!("fixtures/aac-51.m4a").as_slice(), 48_000, 6),+        ("LC stereo", include_bytes!("fixtures/lc-stereo.m4a").as_slice(), 48_000, 2),+    ] {+        let (info, audio) = decode(bytes, None).unwrap_or_else(|err| panic!("{name}: {err}"));+        assert_eq!(info.channels, channels, "{name}");+        assert_eq!(info.sample_rate, rate, "{name}");+        assert_eq!(audio.sample_rate, rate, "{name}");+        assert_eq!(audio.frames(), rate as usize, "{name}: one second, including gapless trimming");+        assert_eq!(info.frames, audio.frames() as u64);+        assert_eq!(probe(bytes, None).unwrap(), info, "{name}: probe and decode disagree");+        assert!(audio.channels.iter().flatten().all(|s| s.is_finite()));+    }+}++#[test]+fn adts_without_a_container_config_still_decodes() {+    let (info, audio) = decode(include_bytes!("fixtures/lc-stereo.aac"), None).unwrap();+    assert_eq!((info.sample_rate, info.channels), (48_000, 2));+    assert!(audio.frames() >= 48_000);+    assert_eq!(probe(include_bytes!("fixtures/lc-stereo.aac"), None).unwrap(), info);+}++#[test]+fn truncated_and_mutated_aac_profiles_never_escape_as_panics() {+    for bytes in [include_bytes!("fixtures/he-v2.m4a").as_slice(), include_bytes!("fixtures/aac-51.m4a").as_slice()] {+        for end in (0..bytes.len()).step_by(37) {+            let _ = probe(&bytes[..end], None);+            let _ = decode(&bytes[..end], None);+        }+        for at in (0..bytes.len()).step_by(29) {+            let mut damaged = bytes.to_vec();+            damaged[at] ^= 0xff;+            let _ = decode(&damaged, None);+        }+    }+}diff --git a/crates/audio-io/tests/fixtures/README.md b/crates/audio-io/tests/fixtures/README.mdnew file mode 100644--- /dev/null+++ b/crates/audio-io/tests/fixtures/README.md@@ -0,0 +1,18 @@+# Original Advanced Audio Coding (AAC) test fixtures++Generated by Codex for Jack, October 19, 2026; MIT OR Apache-2.0.+No recorded audio or third-party samples. Input: one second at 48000 hertz, 16-bit signed+samples, amplitude 2000. Channel c is round(2000 * sin(2*pi*(220+c*110)*i/48000)).+Stereo uses two channels; surround uses six in waveform-file channel order.++he-v1.m4a: afconvert -f m4af -d aach -b 32000 stereo.wav he-v1.m4a+he-v2.m4a: afconvert -f m4af -d aacp -b 32000 stereo.wav he-v2.m4a+aac-51.m4a: afconvert -f m4af -d 'aac ' -b 256000 surround.wav aac-51.m4a+lc-stereo.m4a: ffmpeg -i stereo.wav -c:a aac -b:a 128k -f ipod lc-stereo.m4a+lc-stereo.aac: ffmpeg -i stereo.wav -c:a aac -b:a 128k -f adts lc-stereo.aac++Apple's encoder chooses 32000-hertz output for high-efficiency version 1 at this bitrate; version 2 is 48000.+FFmpeg 9.0.2 independently decodes the three Apple files and the LC container to exactly+one second. The ADTS elementary stream has no container gapless metadata; it has encoder+priming and padding and is therefore intentionally longer. Binary hashes are in the review+manifest. Regeneration requires the encoders; normal regression tests use these fixed files.diff --git a/crates/audio-io/tests/fixtures/aac-51.m4a b/crates/audio-io/tests/fixtures/aac-51.m4anew file mode 100644index 0000000000000000000000000000000000000000..0f0c1ddba1638359d231d51ea24edf0a537d0dffGIT binary patchliteral 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0HcmV?d00001diff --git a/crates/audio-io/tests/malformed.rs b/crates/audio-io/tests/malformed.rs--- a/crates/audio-io/tests/malformed.rs+++ b/crates/audio-io/tests/malformed.rs@@ -207,7 +207,10 @@ fn well_formed_caf_still_reads() {     assert_eq!((info.format, buf.frames()), (FileFormat::Caf, 480));     let table = packet_table(3, 3072, &[10, 0x81, 0x48, 5]);     let aac = caf(&[caf_desc(b"aac ", 0, 1024, 2, 0), (b"pakt", table.len() as i64, table), (b"data", 219, vec![0; 219])]);-    assert_eq!(probe(&aac, None).unwrap().frames, 3072);+    // The packet table is valid, but its zero-filled payload is not AAC. AAC probes+    // now decode packets to learn the actual SBR/PS rate and channel count.+    assert!(matches!(probe(&aac, None), Err(AudioError::Malformed(_))));+    assert!(matches!(decode(&aac, None), Err(AudioError::Malformed(_)))); }  fn atom(kind: &[u8; 4], body: &[u8]) -> Vec<u8> {diff --git a/crates/engine/src/io.rs b/crates/engine/src/io.rs--- a/crates/engine/src/io.rs+++ b/crates/engine/src/io.rs@@ -153,8 +153,13 @@ fn stamp_at_rate(stamp: u64, file_rate: u32, session_rate: u32) -> u64 { pub fn import_audio_bytes(e: &mut Engine, name: &str, bytes: &[u8], path: Option<&str>, target: Option<TrackId>, at: Samples) -> Result<Value> {     let ext = Path::new(name).extension().and_then(|x| x.to_str()).map(str::to_ascii_lowercase);     let (info, buf) = soundcraft_audio_io::decode(bytes, ext.as_deref()).map_err(|err| EngineError::Io(format!("{name}: {err}")))?;-    let buf = at_rate(buf, e.session().sample_rate.hz(), MAX_IMPORT_SAMPLES)-        .ok_or_else(|| EngineError::Io(format!("{name}: file is too large to import")))?;+    let buf = at_rate(buf, e.session().sample_rate.hz(), MAX_IMPORT_SAMPLES).ok_or_else(|| {+        EngineError::Io(format!(+            "{name}: decoded audio would exceed the 4 GiB per-file memory limit after conversion to the session's {} Hz sample rate. \+             Compressed file size does not determine decoded memory; split the source into shorter files before importing",+            e.session().sample_rate.hz()+        ))+    })?;     if buf.frames() == 0 {         return Err(EngineError::Io(format!("{name}: no audio")));     }diff --git a/docs/file-format-parity.md b/docs/file-format-parity.md--- a/docs/file-format-parity.md+++ b/docs/file-format-parity.md@@ -1,6 +1,6 @@ # File-format parity -> **Last reviewed:** 2026-10-13 · **Last updated:** 2026-10-13 · **Change:** trivial (WAV: empty data chunk with trailing metadata (#466); previously minor: continuous fade curvature in SoundCraft sessions) · **Target:** Avid Pro Tools Ultimate 2026.4.1+> **Last reviewed:** 2026-10-20 · **Last updated:** 2026-10-20 · **Change:** minor (AAC extension decoding and gapless trim; readiness estimate unchanged) · **Target:** Avid Pro Tools Ultimate 2026.4.1  Every format Pro Tools reads or writes, and ours. The Pro Tools list comes from the document types its bundle declares (`CFBundleDocumentTypes` in Info.plist: names only, nothing else read) and its@@ -39,7 +39,7 @@ Legend: ✅ supported and tested · 🟡 partial · ❌ missing · — not appli | AIFF / AIFF-C | native | ✅ | ✅ (`fl32`) | Native | | FLAC | import | ✅ | ✅ | Own encoder | | MP3 | import, bounce | ✅ (symphonia) | ❌ | G-21 |-| AAC / M4A / MP4 audio | import, bounce | ✅ (symphonia) | ❌ | G-21 |+| Advanced Audio Coding (AAC) / M4A / MP4 audio | import, bounce | ✅ (Symphonia demuxing, scalar rusty_aac decoding) | ❌ | High-efficiency extensions retain reconstructed rate and stereo; six-channel decoding tested. Single ordinary MP4 edit and Apple priming metadata handled. Export still G-21; complex edit lists and broad codec conformance remain unqualified | | ALAC | import | ✅ | ❌ | | | Ogg Vorbis | — | ✅ | ❌ | Beyond Pro Tools | | CAF | — | ✅ | ❌ | |@@ -80,6 +80,7 @@ Legend: ✅ supported and tested · 🟡 partial · ❌ missing · — not appli  | Date | Change | Summary | |---|---|---|+| 2026-10-19 | minor | AAC extensions and six-channel decoding use pure Rust with scalar dependency features. Regressions cover actual duration, rate, channels and ordinary priming metadata; no readiness percentage change | | 2026-10-13 | trivial | WAV: empty data chunk with trailing metadata (#466) | | 2026-10-13 | minor | Fade curvature round-trips in sessions with a zero default for older files. Format version and readiness estimate unchanged | | 2026-10-10 | major | Created: format inventory against Pro Tools 2026.4.1's declared document types and import/bounce options |
Rendered 2026-11-02. Read-only; agents use the API at /v1 and /mcp.