Matthew Jackson
decb87a250
- AACS: delete in-lib keydb parser (Step 3); boil-down primitives (mk_from_dk/vuk_from_mk/uk_from_vuk) + newtypes; KeySource->get_uk(ctx)+ ResolveCtx; Unlocker->unlock()->Result<Vid,UnlockError> + AacsCertUnlocker; OEM bus-key gate (AacsBusKeyUnavailable); structured ResolutionTrace (Step 4). - TrueHD: sample-rate from major-sync, Atmos label, 44.1k AU duration. - consts: central media/format constants module; 17 duplicate const-defs centralized (sector/TS-packet/source-packet); mpls stream-entry + category codes named. - clippy --all-targets -D warnings clean (1.86); fmt clean; 2199 lib tests.
1029 lines
42 KiB
Rust
1029 lines
42 KiB
Rust
//! Dolby TrueHD / Atmos elementary stream parser.
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//!
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//! BD-TS TrueHD PES packets contain interleaved AC-3 + TrueHD access units.
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//! Access units span PES boundaries — must buffer and reassemble.
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//!
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//! TrueHD access unit header (4 bytes):
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//! bytes 0-1: top nibble = MLP check/access-unit nibble, lower 12 bits =
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//! access-unit length in 2-byte words
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//! bytes 2-3: timing value
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//! bytes 4..: substream data (major sync 0xF8726FBA may appear at offset 4)
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//!
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//! AC-3 frames (interleaved, same PID): start with sync word 0x0B77.
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//! We skip AC-3 frames and only emit TrueHD access units.
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use super::{CodecParser, Frame, PesPacket, pts_to_ns};
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/// Duration of one TrueHD access unit in nanoseconds for the 48 kHz family
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/// (48 / 96 / 192 kHz). `access_unit_size = 40 << (ratebits & 7)` and
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/// `sample_rate = 48000 << (ratebits & 7)`; the shared shift cancels in
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/// `samples_per_AU / sample_rate = 40/48000 = 1/1200 s`, so this constant is
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/// exact for the whole 48 kHz family — 48, 96 and 192 kHz alike. Used as the
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/// default until a major sync reveals the actual rate family.
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const AU_DURATION_NS: i64 = 833_333;
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/// Duration of one TrueHD access unit in nanoseconds for the 44.1 kHz family
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/// (44.1 / 88.2 / 176.4 kHz): `40/44100 = 1/1102.5 s = 907_029.478… ns`. The
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/// 48 kHz constant would run ~8.95 % fast on these (rare) streams.
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const AU_DURATION_NS_441: i64 = 907_029;
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/// Hard cap on the reassembly buffer. A valid TrueHD/MAT access unit is
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/// well under 32 KiB; if the buffer grows far past that without yielding a
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/// frame the stream is malformed, so we drop it and resync rather than grow
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/// without bound. Parity with the AC-3 / DTS / PGS caps.
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const MAX_TRUEHD_BUF: usize = 256 * 1024;
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pub struct TrueHdParser {
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buf: Vec<u8>,
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next_pts_ns: i64,
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/// Per-AU PTS increment. Defaults to the 48 kHz-family value (833_333) and
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/// is refined to the 44.1 kHz-family value once the first major sync reveals
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/// the actual rate. Stays at the default for streams whose major sync is not
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/// yet seen (head of stream) — preserving byte-identical timing for the
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/// common 48 kHz case.
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au_duration_ns: i64,
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}
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impl Default for TrueHdParser {
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fn default() -> Self {
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Self::new()
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}
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}
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impl TrueHdParser {
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pub fn new() -> Self {
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Self {
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buf: Vec::with_capacity(32768),
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next_pts_ns: 0,
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au_duration_ns: AU_DURATION_NS,
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}
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}
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/// Size (bytes) of the AC-3 frame at the buffer head.
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///
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/// Distinguishes three cases the caller must treat differently:
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/// - `Unmappable`: the header's fscod/frmsizecod don't map to a real frame
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/// size (reserved fscod==3, or frmsizecod >= 38). The caller must drain
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/// and resync, NOT wait for more data — waiting would stall forever.
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/// - `NeedMore`: a valid size, but the frame isn't fully buffered yet.
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/// - `Frame(n)`: a complete `n`-byte AC-3 frame is buffered.
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///
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/// Frame sizing reuses `ac3::ac3_frame_size` so the AC-3 size table has a
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/// single source of truth shared with the AC-3 parser; a returned `0` there
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/// (reserved fscod or out-of-range frmsizecod) is the unmappable case.
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fn ac3_frame_at_head(&self) -> Ac3Size {
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if self.buf.len() < 6 {
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return Ac3Size::NeedMore;
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}
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let frame_bytes = super::ac3::ac3_frame_size(&self.buf);
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if frame_bytes == 0 {
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// Reserved fscod or out-of-range frmsizecod → unmappable header.
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return Ac3Size::Unmappable;
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}
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if self.buf.len() < frame_bytes {
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return Ac3Size::NeedMore;
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}
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Ac3Size::Frame(frame_bytes)
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}
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}
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/// Secondary validation for an AC-3 frame of `frame_bytes` at the buffer head:
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/// is its computed end a plausible boundary? Accept when the frame fills the
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/// rest of the buffer, or the bytes that follow start another AC-3 sync
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/// (0x0B77) or a plausible TrueHD access unit (non-zero 12-bit length within
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/// the 32 KiB cap). If none holds, the leading 0x0B77 is more likely a TrueHD
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/// AU header that happens to look like AC-3, so the AC-3 reading is rejected.
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fn ac3_boundary_corroborated(buf: &[u8], frame_bytes: usize) -> bool {
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if frame_bytes >= buf.len() {
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// The AC-3 frame is fully buffered and ends the data — consistent.
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return true;
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}
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let tail = &buf[frame_bytes..];
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if tail.len() < 2 {
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// Not enough following bytes to judge; accept (the next call will see
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// the continuation).
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return true;
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}
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// Another AC-3 sync immediately after?
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if tail[0] == 0x0B && tail[1] == 0x77 {
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return true;
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}
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// A plausible TrueHD AU header after? (non-zero 12-bit length, <= 32 KiB)
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let next_words = (((tail[0] as usize) << 8) | tail[1] as usize) & 0xFFF;
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next_words != 0 && next_words * 2 <= 32768
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}
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/// Outcome of sizing the AC-3 frame at the TrueHD buffer head.
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enum Ac3Size {
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/// fscod/frmsizecod don't map to a real frame size — resync, don't wait.
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Unmappable,
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/// A valid size, but the frame is not fully buffered yet.
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NeedMore,
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/// A complete `n`-byte AC-3 frame is buffered.
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Frame(usize),
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}
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impl CodecParser for TrueHdParser {
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fn parse(&mut self, pes: &PesPacket) -> Vec<Frame> {
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if pes.data.is_empty() {
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return Vec::new();
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}
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// Capture the PTS base ONLY at an access-unit boundary, i.e. when no AU
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// is mid-assembly in `buf`. TrueHD access units span PES packets; a PES
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// that merely continues an AU already in progress carries its own (later)
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// PTS, which must NOT override the running per-AU timestamp. Adopting it
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// mid-AU would snap that AU's PTS backward/forward and break the
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// monotonic +AU_DURATION_NS cadence (A/V drift). Once the buffer is empty
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// the next PES legitimately begins a new AU and seeds the base.
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if self.buf.is_empty() {
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if let Some(pts) = pes.pts {
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self.next_pts_ns = pts_to_ns(pts);
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}
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}
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self.buf.extend_from_slice(&pes.data);
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let mut frames = Vec::new();
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loop {
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if self.buf.len() < 4 {
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break;
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}
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// AC-3 frame (interleaved): starts with sync word 0x0B77.
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//
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// 0x0B 0x77 is also a legal TrueHD AU header (check-nibble 0,
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// length-high-bits 0xB → length 0xB77 words). To avoid an AC-3
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// misread stealing a real TrueHD AU, an AC-3 frame is only accepted
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// when its computed end is corroborated by what follows: end of
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// buffer (frame fills the rest), another AC-3 sync, or a plausible
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// TrueHD AU header. If none holds, this is treated as a TrueHD AU.
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if self.buf[0] == 0x0B && self.buf[1] == 0x77 {
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match self.ac3_frame_at_head() {
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Ac3Size::Unmappable => {
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// Permanently unmappable header at the head would stall
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// the parser forever; resync by dropping 2 bytes so one
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// bad frame costs one frame, not the whole buffer.
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self.buf.drain(..2);
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continue;
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}
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Ac3Size::NeedMore => break, // wait for the rest of the frame
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Ac3Size::Frame(skip) => {
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if ac3_boundary_corroborated(&self.buf, skip) {
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self.buf.drain(..skip);
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continue;
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}
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// Not corroborated — fall through and interpret the
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// 0x0B77 bytes as a TrueHD access unit instead.
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}
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}
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}
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// TrueHD access unit: lower 12 bits of first 2 bytes = length in words
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let unit_words = (((self.buf[0] as usize) << 8) | self.buf[1] as usize) & 0xFFF;
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if unit_words == 0 {
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// A zero-length AU is malformed/padding. The AU header is 4 bytes
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// (length + timing); drain the whole header, not just the length
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// word, otherwise the timing bytes get misread as the next
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// length word and produce a spurious parse on the next iteration.
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self.buf.drain(..4);
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continue;
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}
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// unit_words is masked to 12 bits, so unit_bytes <= 4095 * 2 = 8190;
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// no separate oversize-resync guard is reachable.
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let unit_bytes = unit_words * 2;
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if self.buf.len() < unit_bytes {
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break; // incomplete access unit, wait for more data
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}
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let is_major_sync = unit_bytes >= 8
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&& (u32::from_be_bytes([self.buf[4], self.buf[5], self.buf[6], self.buf[7]])
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& 0xFFFF_FFFE)
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== 0xF872_6FBA;
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// On a major sync the 32-bit `format_info` word (immediately after
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// the 4-byte sync, i.e. AU bytes 8..12) carries the rate nibble.
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// Refine the per-AU PTS increment to the actual rate family. The
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// 48 kHz family resolves to the unchanged 833_333 default, so the
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// common case stays byte-identical; only the 44.1 kHz family shifts.
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if is_major_sync && unit_bytes >= 12 {
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let format_info =
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u32::from_be_bytes([self.buf[8], self.buf[9], self.buf[10], self.buf[11]]);
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self.au_duration_ns = truehd_au_duration_ns(format_info);
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}
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frames.push(Frame {
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coding: None,
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source: None,
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pts_ns: self.next_pts_ns,
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keyframe: is_major_sync,
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data: self.buf[..unit_bytes].to_vec(),
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duration_ns: None,
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});
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self.buf.drain(..unit_bytes);
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self.next_pts_ns += self.au_duration_ns;
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}
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// Bound memory on malformed input: a stream that never yields a
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// complete frame must not grow the buffer without limit.
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if self.buf.len() > MAX_TRUEHD_BUF {
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self.buf.clear();
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}
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frames
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}
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fn codec_private(&self) -> Option<Vec<u8>> {
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None
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}
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}
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/// Per-bit channel counts for the TrueHD 8-channel and 6-channel presentation
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/// channel-assignment masks (per the MLP spec / FFmpeg `thd_channels`). Some
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/// bits denote a stereo pair (2), others a single channel (1).
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const THD_8CH: [u8; 13] = [2, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1];
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const THD_6CH: [u8; 5] = [2, 1, 1, 2, 1];
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/// Decode the true channel count from a TrueHD major-sync `format_info` word
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/// (the 32 bits immediately after the 0xF8726FBA sync). Returns the richest
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/// presentation's channel count — the 8-channel (e.g. 7.1) presentation when
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/// present, else the 6-channel (5.1) one. This is the real layout that the MPLS
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/// `audio_format` base field (often 5.1 even on a 7.1/Atmos track) understates.
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pub fn truehd_channels(format_info: u32) -> Option<u8> {
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let ch8 = (format_info & 0x1FFF) as u16; // 8ch_presentation_channel_assignment (13 bits)
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let ch6 = ((format_info >> 15) & 0x1F) as u16; // 6ch_presentation_channel_assignment (5 bits)
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let count = |mask: u16, tbl: &[u8]| -> u8 {
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tbl.iter()
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.enumerate()
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.filter(|(i, _)| mask & (1 << i) != 0)
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.map(|(_, &c)| c)
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.sum()
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};
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if ch8 != 0 {
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Some(count(ch8, &THD_8CH))
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} else if ch6 != 0 {
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Some(count(ch6, &THD_6CH))
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} else {
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None
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}
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}
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/// Scan a demuxed TrueHD elementary-stream chunk for the first major sync and
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/// decode its true channel count. The stream may interleave AC-3; we scan for
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/// the major-sync word anywhere and read the following `format_info`.
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pub fn truehd_channels_from_stream(data: &[u8]) -> Option<u8> {
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let mut p = 0;
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while p + 8 <= data.len() {
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let w = u32::from_be_bytes([data[p], data[p + 1], data[p + 2], data[p + 3]]);
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if (w & 0xFFFF_FFFE) == 0xF872_6FBA {
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let fi = u32::from_be_bytes([data[p + 4], data[p + 5], data[p + 6], data[p + 7]]);
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return truehd_channels(fi);
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}
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p += 1;
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}
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None
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}
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/// Real sample rate (Hz) from a TrueHD major-sync `format_info` word.
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///
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/// The 4-bit `ratebits` nibble sits in `format_info` bits 31..28 (the top
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/// nibble), the same word `truehd_channels` reads for the channel masks. The
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/// MLP rate formula is `(ratebits & 8 ? 44100 : 48000) << (ratebits & 7)`;
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/// rather than evaluate it blindly this is a **strict whitelist** of the only
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/// six rates that occur on real BD/UHD TrueHD. Every other code — the invalid
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/// `0xF`, the formula-only `0x3`/`0xB`, and all reserved values — returns
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/// `None`, so a malformed or unexpected field can never produce a wrong
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/// `SamplingFrequency`; the caller falls back to its container-derived rate.
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pub fn truehd_sample_rate_hz(format_info: u32) -> Option<u32> {
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match (format_info >> 28) & 0xF {
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0x0 => Some(48000),
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0x1 => Some(96000),
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0x2 => Some(192000),
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0x8 => Some(44100),
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0x9 => Some(88200),
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0xA => Some(176400),
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_ => None,
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}
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}
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/// Per-AU PTS increment (ns) for the rate family encoded in `format_info`.
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///
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/// Derived from the same whitelisted rate as [`truehd_sample_rate_hz`]: the
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/// 44.1 kHz family (44.1 / 88.2 / 176.4 kHz) is `907_029` ns; everything else —
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/// the entire 48 kHz family AND any unrecognised rate — keeps the exact current
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/// `833_333` default, so the common case and all unknown/garbage inputs are
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/// byte-identical to prior behaviour.
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pub fn truehd_au_duration_ns(format_info: u32) -> i64 {
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match truehd_sample_rate_hz(format_info) {
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Some(44100) | Some(88200) | Some(176400) => AU_DURATION_NS_441,
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_ => AU_DURATION_NS,
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}
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}
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/// First TrueHD major sync found in a demuxed elementary-stream chunk: the
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/// `format_info` word plus the Atmos signal. A single scan that the per-field
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/// helpers below share, so the host probes the bitstream once for channels,
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/// sample rate and Atmos.
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pub struct TrueHdSyncInfo {
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/// The 32-bit word immediately after the 0xF8726FBA sync (channel masks +
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/// rate nibble). Feed to `truehd_channels` / `truehd_sample_rate_hz`.
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pub format_info: u32,
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/// `num_substreams >= 4` ⟺ a 4th (Atmos object/OAMD) substream is present.
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/// `num_substreams = msync[16] >> 4`, where `msync[0]` is the sync's 0xF8.
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/// `None` when the AU is too short to reach that byte — never guess Atmos.
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pub is_atmos: Option<bool>,
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}
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/// Scan a demuxed TrueHD chunk for the first major sync and return its
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/// `format_info` and Atmos signal. The stream may interleave AC-3; the scan
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/// advances one byte at a time and matches the sync word anywhere.
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pub fn truehd_sync_info_from_stream(data: &[u8]) -> Option<TrueHdSyncInfo> {
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let mut p = 0;
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while p + 8 <= data.len() {
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let w = u32::from_be_bytes([data[p], data[p + 1], data[p + 2], data[p + 3]]);
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if (w & 0xFFFF_FFFE) == 0xF872_6FBA {
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let format_info =
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u32::from_be_bytes([data[p + 4], data[p + 5], data[p + 6], data[p + 7]]);
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// num_substreams is the top nibble of the 17th sync byte (p + 16).
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// .get() yields None — not a panic and not a false Atmos — when the
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// AU is truncated before that byte.
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let is_atmos = data.get(p + 16).map(|&b| (b >> 4) >= 4);
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return Some(TrueHdSyncInfo {
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format_info,
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is_atmos,
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});
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}
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p += 1;
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}
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None
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}
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/// Real sample rate (Hz) from the first major sync in a demuxed chunk, or
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/// `None` if no major sync is found or its rate code is not whitelisted.
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pub fn truehd_sample_rate_from_stream(data: &[u8]) -> Option<u32> {
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truehd_sync_info_from_stream(data).and_then(|s| truehd_sample_rate_hz(s.format_info))
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}
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/// Whether the first major sync in a demuxed chunk carries an Atmos substream.
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/// `None` when no major sync is found or the AU is too short to read the
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/// substream count — callers must treat `None` as "not Atmos" (never label).
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pub fn truehd_is_atmos_from_stream(data: &[u8]) -> Option<bool> {
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truehd_sync_info_from_stream(data).and_then(|s| s.is_atmos)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::mux::ts::PesPacket;
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fn make_pes(data: Vec<u8>, pts: Option<i64>) -> PesPacket {
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PesPacket {
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source: None,
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pid: 0x1100,
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pts,
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dts: None,
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data,
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}
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}
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fn make_truehd_unit(size_bytes: usize) -> Vec<u8> {
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let words = size_bytes / 2;
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let mut data = vec![0u8; size_bytes];
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data[0] = ((words >> 8) & 0x0F) as u8;
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data[1] = (words & 0xFF) as u8;
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data
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}
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fn make_ac3_frame() -> Vec<u8> {
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// Minimal AC-3 frame: sync 0x0B77, fscod=0 (48kHz), frmsizecod=0 (64 words = 128 bytes)
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let mut data = vec![0u8; 128];
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data[0] = 0x0B;
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data[1] = 0x77;
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data[4] = 0x00; // fscod=0, frmsizecod=0
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data
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}
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#[test]
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fn parse_empty_pes() {
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let mut parser = TrueHdParser::new();
|
|
let pes = make_pes(Vec::new(), Some(0));
|
|
assert!(parser.parse(&pes).is_empty());
|
|
}
|
|
|
|
#[test]
|
|
fn parse_single_unit() {
|
|
let mut parser = TrueHdParser::new();
|
|
let unit = make_truehd_unit(200);
|
|
let pes = make_pes(unit, Some(90000));
|
|
let frames = parser.parse(&pes);
|
|
assert_eq!(frames.len(), 1);
|
|
assert_eq!(frames[0].data.len(), 200);
|
|
}
|
|
|
|
#[test]
|
|
fn parse_unit_spanning_two_pes() {
|
|
let mut parser = TrueHdParser::new();
|
|
let unit = make_truehd_unit(200);
|
|
let mid = 100;
|
|
|
|
let pes1 = make_pes(unit[..mid].to_vec(), Some(90000));
|
|
assert!(parser.parse(&pes1).is_empty());
|
|
|
|
let pes2 = make_pes(unit[mid..].to_vec(), Some(93000));
|
|
let frames = parser.parse(&pes2);
|
|
assert_eq!(frames.len(), 1);
|
|
assert_eq!(frames[0].data.len(), 200);
|
|
}
|
|
|
|
#[test]
|
|
fn parse_multiple_units_incrementing_pts() {
|
|
let mut parser = TrueHdParser::new();
|
|
let mut data = make_truehd_unit(100);
|
|
data.extend_from_slice(&make_truehd_unit(120));
|
|
let pes = make_pes(data, Some(90000));
|
|
let frames = parser.parse(&pes);
|
|
assert_eq!(frames.len(), 2);
|
|
assert_eq!(frames[0].data.len(), 100);
|
|
assert_eq!(frames[1].data.len(), 120);
|
|
assert_eq!(frames[1].pts_ns - frames[0].pts_ns, AU_DURATION_NS);
|
|
}
|
|
|
|
#[test]
|
|
fn skip_interleaved_ac3() {
|
|
let mut parser = TrueHdParser::new();
|
|
let ac3 = make_ac3_frame();
|
|
let truehd = make_truehd_unit(200);
|
|
let mut data = ac3;
|
|
data.extend_from_slice(&truehd);
|
|
let pes = make_pes(data, Some(90000));
|
|
let frames = parser.parse(&pes);
|
|
assert_eq!(frames.len(), 1);
|
|
assert_eq!(frames[0].data.len(), 200);
|
|
}
|
|
|
|
#[test]
|
|
fn continuation_pes_pts_does_not_override_au_in_progress() {
|
|
// An AU split across two PES packets: the FIRST PES (pts 90000) begins
|
|
// the AU; the SECOND PES (pts 99999, a later timestamp) merely continues
|
|
// it. The emitted AU must keep the first PES's PTS, not adopt the
|
|
// continuation PES's later timestamp.
|
|
let mut parser = TrueHdParser::new();
|
|
let unit = make_truehd_unit(200);
|
|
let mid = 100;
|
|
|
|
let pes1 = make_pes(unit[..mid].to_vec(), Some(90000));
|
|
assert!(parser.parse(&pes1).is_empty(), "AU held mid-assembly");
|
|
|
|
// Continuation PES carries a later PTS that must be ignored for this AU.
|
|
let pes2 = make_pes(unit[mid..].to_vec(), Some(99999));
|
|
let frames = parser.parse(&pes2);
|
|
assert_eq!(frames.len(), 1);
|
|
assert_eq!(
|
|
frames[0].pts_ns,
|
|
pts_to_ns(90000),
|
|
"AU keeps the PTS of the PES that began it, not the continuation PES"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn new_au_after_empty_buffer_takes_new_pes_pts() {
|
|
// After an AU fully drains (buffer empty), the next PES legitimately
|
|
// seeds a fresh PTS base.
|
|
let mut parser = TrueHdParser::new();
|
|
let f1 = parser.parse(&make_pes(make_truehd_unit(200), Some(90000)));
|
|
assert_eq!(f1.len(), 1);
|
|
assert_eq!(f1[0].pts_ns, pts_to_ns(90000));
|
|
|
|
// Buffer is now empty; a new PES with a new PTS starts a new AU.
|
|
let f2 = parser.parse(&make_pes(make_truehd_unit(200), Some(180000)));
|
|
assert_eq!(f2.len(), 1);
|
|
assert_eq!(
|
|
f2[0].pts_ns,
|
|
pts_to_ns(180000),
|
|
"new AU after empty buffer adopts the new PES PTS"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn zero_length_au_drains_full_header() {
|
|
// A zero-length AU header (4 bytes: length=0 + timing) must be skipped
|
|
// whole. If only 2 bytes were drained the timing bytes would be misread
|
|
// as a bogus length word. Here the timing bytes are 0x01 0x90 (= 0x190 =
|
|
// 400 words = 800 bytes) which, if misread, would stall the parser
|
|
// waiting for 800 bytes that never come. Draining 4 lets the following
|
|
// real unit parse.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut data = vec![0x00, 0x00, 0x01, 0x90]; // length=0, timing=0x0190
|
|
data.extend_from_slice(&make_truehd_unit(200));
|
|
let frames = parser.parse(&make_pes(data, Some(90000)));
|
|
assert_eq!(frames.len(), 1, "real unit parses after zero-length header");
|
|
assert_eq!(frames[0].data.len(), 200);
|
|
}
|
|
|
|
#[test]
|
|
fn unmappable_ac3_header_resyncs_not_stalls() {
|
|
// A permanently unmappable 0x0B77 header at the buffer head (reserved
|
|
// fscod==3) must NOT stall the parser. It used to be treated as
|
|
// "incomplete, wait" and break forever, dropping every following AU.
|
|
// Now it resyncs (drains 2 bytes) so a clean TrueHD unit behind it is
|
|
// eventually emitted.
|
|
let mut parser = TrueHdParser::new();
|
|
// Unmappable AC-3-looking head: 0x0B77, byte4 fscod=3 (0xC0).
|
|
let mut data = vec![0x0B, 0x77, 0x00, 0x00, 0xC0, 0x00];
|
|
// A clean TrueHD AU follows.
|
|
data.extend_from_slice(&make_truehd_unit(200));
|
|
let frames = parser.parse(&make_pes(data, Some(90000)));
|
|
assert_eq!(
|
|
frames.len(),
|
|
1,
|
|
"TrueHD AU behind a bad header is recovered"
|
|
);
|
|
assert_eq!(frames[0].data.len(), 200);
|
|
assert!(parser.buf.is_empty(), "buffer fully consumed, no stall");
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_au_with_0b77_head_not_stolen_by_ac3() {
|
|
// A TrueHD AU whose first two bytes are 0x0B 0x77 (length 0xB77 = 2935
|
|
// words = 5870 bytes) must NOT be misrouted to the AC-3 path. The AC-3
|
|
// size for this header (fscod from byte4) would close the boundary in
|
|
// the wrong place; the secondary corroboration rejects it because the
|
|
// computed AC-3 end is not followed by another AC-3 sync / TrueHD AU.
|
|
let mut parser = TrueHdParser::new();
|
|
// 5870-byte AU starting with 0x0B 0x77. Byte 4 = 0x00 → AC-3 would
|
|
// size it as fscod=0, frmsizecod=0 → 128 bytes. The bytes at offset 128
|
|
// are zeros (next_words==0) → not corroborated → kept as TrueHD.
|
|
let mut unit = vec![0u8; 5870];
|
|
unit[0] = 0x0B; // 0xB high nibble of the 12-bit length, check nibble 0
|
|
unit[1] = 0x77; // low byte of length 0xB77
|
|
let frames = parser.parse(&make_pes(unit, Some(90000)));
|
|
assert_eq!(frames.len(), 1, "0x0B77-headed TrueHD AU kept whole");
|
|
assert_eq!(
|
|
frames[0].data.len(),
|
|
5870,
|
|
"AU sized by TrueHD length, not AC-3 frame size"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn codec_private_none() {
|
|
let parser = TrueHdParser::new();
|
|
assert!(parser.codec_private().is_none());
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_71_from_8ch_presentation() {
|
|
// 8ch presentation assignment bits 0-4 (LR,C,LFE,LsRs,back-LR) = 2+1+1+2+2 = 8.
|
|
let format_info = 0x1F; // low 13 bits = 0x1F
|
|
assert_eq!(truehd_channels(format_info), Some(8));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_51_from_6ch_presentation() {
|
|
// No 8ch presentation; 6ch bits 0-3 (LR,C,LFE,LsRs) = 2+1+1+2 = 6.
|
|
let format_info = 0xF << 15; // 6ch field = 0xF, 8ch field = 0
|
|
assert_eq!(truehd_channels(format_info), Some(6));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_scan_finds_major_sync() {
|
|
// [junk][major sync 0xF8726FBA][format_info: 8ch=0x1F -> 7.1]
|
|
let mut data = vec![0xAA, 0xBB];
|
|
data.extend_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
data.extend_from_slice(&0x0000_001Fu32.to_be_bytes());
|
|
assert_eq!(truehd_channels_from_stream(&data), Some(8));
|
|
}
|
|
|
|
// --- truehd_channels: per-bit mask channel counts (MLP / FFmpeg table) ---
|
|
|
|
#[test]
|
|
fn truehd_channels_8ch_single_bit_counts() {
|
|
// THD_8CH = [2,1,1,2,2,2,2,1,1,2,2,1,1]. A single set bit must yield
|
|
// exactly that bit's channel count. Bit 0 → 2 (L/R pair), bit 1 → 1 (C),
|
|
// bit 2 → 1 (LFE), bit 7 → 1.
|
|
assert_eq!(truehd_channels(1 << 0), Some(2));
|
|
assert_eq!(truehd_channels(1 << 1), Some(1));
|
|
assert_eq!(truehd_channels(1 << 2), Some(1));
|
|
assert_eq!(truehd_channels(1 << 7), Some(1));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_8ch_all_bits_set() {
|
|
// All 13 8ch bits set = 2+1+1+2+2+2+2+1+1+2+2+1+1 = 20. ch8 field is the
|
|
// low 13 bits (0x1FFF).
|
|
assert_eq!(truehd_channels(0x1FFF), Some(20));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_6ch_used_only_when_8ch_zero() {
|
|
// The 8ch presentation takes priority; the 6ch field (bits 15-19) is read
|
|
// ONLY when ch8 == 0. THD_6CH = [2,1,1,2,1]. Set 6ch bit 0 (→2) while
|
|
// 8ch is zero: 6ch field value 1 at shift 15.
|
|
assert_eq!(truehd_channels(1 << 15), Some(2));
|
|
// All 5 6ch bits = 2+1+1+2+1 = 7. 0x1F << 15.
|
|
assert_eq!(truehd_channels(0x1F << 15), Some(7));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_8ch_wins_over_6ch_when_both_present() {
|
|
// When BOTH fields are non-zero, the richer 8ch presentation is used.
|
|
// 8ch = bit0 (→2), 6ch = all bits (would be 7) → result must be 2, the
|
|
// 8ch count, proving the `if ch8 != 0` branch wins.
|
|
let fi = (1u32 << 0) | (0x1F << 15);
|
|
assert_eq!(truehd_channels(fi), Some(2));
|
|
}
|
|
|
|
#[test]
|
|
fn truehd_channels_none_when_both_fields_zero() {
|
|
// No presentation flags set → None (can't determine layout).
|
|
assert_eq!(truehd_channels(0), None);
|
|
// Bits outside both fields (e.g. bit 13, bit 14, bits 20-31) don't count
|
|
// as a presentation and must still yield None.
|
|
assert_eq!(truehd_channels(1 << 13), None);
|
|
assert_eq!(truehd_channels(1 << 20), None);
|
|
}
|
|
|
|
// --- truehd_channels_from_stream: major-sync variant bit + scan ---
|
|
|
|
#[test]
|
|
fn channels_from_stream_matches_variant_sync_0xfb() {
|
|
// The sync match masks the low bit: 0xF8726FBA & 0xFFFFFFFE == base, and
|
|
// 0xF8726FBB (the +1 variant) matches the same masked pattern. A stream
|
|
// carrying 0xF8726FBB must still be recognised.
|
|
let mut data = vec![0x00];
|
|
data.extend_from_slice(&0xF872_6FBBu32.to_be_bytes());
|
|
data.extend_from_slice(&0x0000_001Fu32.to_be_bytes());
|
|
assert_eq!(truehd_channels_from_stream(&data), Some(8));
|
|
}
|
|
|
|
#[test]
|
|
fn channels_from_stream_none_without_major_sync() {
|
|
// No major sync anywhere → None, no panic, scan terminates.
|
|
let data = vec![0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88];
|
|
assert_eq!(truehd_channels_from_stream(&data), None);
|
|
}
|
|
|
|
#[test]
|
|
fn channels_from_stream_too_short_for_format_info() {
|
|
// Sync present but fewer than 8 bytes total → the `p + 8 <= len` guard
|
|
// prevents reading format_info out of bounds → None.
|
|
let data = 0xF872_6FBAu32.to_be_bytes().to_vec(); // 4 bytes only
|
|
assert_eq!(truehd_channels_from_stream(&data), None);
|
|
}
|
|
|
|
#[test]
|
|
fn channels_from_stream_unaligned_sync() {
|
|
// The scan advances 1 byte at a time, so a major sync at an odd offset
|
|
// is still found. Place it at offset 3.
|
|
let mut data = vec![0xAA, 0xBB, 0xCC];
|
|
data.extend_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
data.extend_from_slice(&(0x1Fu32).to_be_bytes());
|
|
assert_eq!(truehd_channels_from_stream(&data), Some(8));
|
|
}
|
|
|
|
// --- AU length field: 12-bit mask, partial AU, is_major_sync keyframe ---
|
|
|
|
#[test]
|
|
fn au_length_uses_low_12_bits_only() {
|
|
// unit_words = ((b0<<8)|b1) & 0xFFF. The top 4 bits of b0 (the MLP
|
|
// check/access-unit nibble) must NOT inflate the length. b0 = 0xF1
|
|
// (nibble 0xF, low 0x1), b1 = 0x00 → words = 0x100 = 256 → 512 bytes.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut unit = vec![0u8; 512];
|
|
unit[0] = 0xF1; // high nibble 0xF must be masked off
|
|
unit[1] = 0x00;
|
|
let f = parser.parse(&make_pes(unit, Some(90000)));
|
|
assert_eq!(f.len(), 1);
|
|
assert_eq!(
|
|
f[0].data.len(),
|
|
512,
|
|
"length sized from low 12 bits (0x100 words), nibble masked"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn au_with_major_sync_is_keyframe() {
|
|
// An AU whose bytes 4-7 hold the major sync (0xF8726FBA, low bit masked)
|
|
// is a restart point → keyframe. Build a >=8-byte AU with the sync at
|
|
// offset 4. words = 100 → 200 bytes.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut unit = make_truehd_unit(200);
|
|
unit[4..8].copy_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
let f = parser.parse(&make_pes(unit, Some(90000)));
|
|
assert_eq!(f.len(), 1);
|
|
assert!(f[0].keyframe, "major-sync AU must be flagged keyframe");
|
|
}
|
|
|
|
#[test]
|
|
fn au_without_major_sync_is_not_keyframe() {
|
|
// A plain AU (no major sync at offset 4) is not a keyframe.
|
|
let mut parser = TrueHdParser::new();
|
|
let f = parser.parse(&make_pes(make_truehd_unit(200), Some(90000)));
|
|
assert_eq!(f.len(), 1);
|
|
assert!(!f[0].keyframe);
|
|
}
|
|
|
|
#[test]
|
|
fn major_sync_variant_bit_also_keyframe() {
|
|
// The keyframe check masks the low bit (0xFFFF_FFFE), so the 0xF8726FBB
|
|
// variant must also be detected as a major sync.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut unit = make_truehd_unit(200);
|
|
unit[4..8].copy_from_slice(&0xF872_6FBBu32.to_be_bytes());
|
|
let f = parser.parse(&make_pes(unit, Some(90000)));
|
|
assert_eq!(f.len(), 1);
|
|
assert!(f[0].keyframe, "major-sync variant 0xFB also a keyframe");
|
|
}
|
|
|
|
#[test]
|
|
fn incomplete_au_waits_does_not_emit_short() {
|
|
// The AU length declares more bytes than buffered → parser must wait, not
|
|
// emit a truncated AU. words=300 (0x12C) → 600 bytes declared, only 100
|
|
// present. 300 exercises both length bytes (high nibble 0x1, low 0x2C).
|
|
let mut parser = TrueHdParser::new();
|
|
let mut data = vec![0u8; 100];
|
|
let words = 300usize;
|
|
data[0] = ((words >> 8) & 0x0F) as u8; // 0x01
|
|
data[1] = (words & 0xFF) as u8; // 0x2C → 300 words = 600 bytes
|
|
let f = parser.parse(&make_pes(data, Some(90000)));
|
|
assert!(
|
|
f.is_empty(),
|
|
"must not emit fewer bytes than the length field"
|
|
);
|
|
assert_eq!(parser.buf.len(), 100, "partial AU retained");
|
|
}
|
|
|
|
#[test]
|
|
fn buffer_stays_bounded_across_many_partial_pes() {
|
|
// Malformed/never-completing input must keep the reassembly buffer
|
|
// bounded by MAX_TRUEHD_BUF. Repeatedly feed AU fragments whose declared
|
|
// length always exceeds what is buffered, so no AU ever completes; the
|
|
// post-loop cap guard must clear the buffer instead of letting it grow
|
|
// unbounded across many calls.
|
|
let mut parser = TrueHdParser::new();
|
|
// Each PES: a head declaring 0xFFF words (8190 bytes) but only 4096 bytes
|
|
// present → incomplete → retained. Across many PES this would accumulate
|
|
// without the cap.
|
|
for _ in 0..200 {
|
|
let mut frag = vec![0u8; 4096];
|
|
frag[0] = 0x0F; // 0x0FFF words = 4095 → 8190 bytes declared
|
|
frag[1] = 0xFF;
|
|
let _ = parser.parse(&make_pes(frag, Some(0)));
|
|
assert!(
|
|
parser.buf.len() <= MAX_TRUEHD_BUF,
|
|
"reassembly buffer exceeded cap: {} > {}",
|
|
parser.buf.len(),
|
|
MAX_TRUEHD_BUF
|
|
);
|
|
}
|
|
}
|
|
|
|
// --- ac3_boundary_corroborated: the AC-3-vs-TrueHD disambiguation ---
|
|
|
|
#[test]
|
|
fn ac3_corroborated_when_frame_fills_buffer() {
|
|
// frame_bytes >= buf.len() → the AC-3 frame ends the buffer → corroborated.
|
|
let buf = vec![0u8; 128];
|
|
assert!(ac3_boundary_corroborated(&buf, 128));
|
|
assert!(ac3_boundary_corroborated(&buf, 200));
|
|
}
|
|
|
|
#[test]
|
|
fn ac3_corroborated_when_next_is_ac3_sync() {
|
|
// Bytes after the frame begin with 0x0B 0x77 → another AC-3 frame →
|
|
// corroborated.
|
|
let mut buf = vec![0u8; 130];
|
|
buf[128] = 0x0B;
|
|
buf[129] = 0x77;
|
|
assert!(ac3_boundary_corroborated(&buf, 128));
|
|
}
|
|
|
|
#[test]
|
|
fn ac3_corroborated_when_next_is_plausible_truehd_au() {
|
|
// Bytes after the frame form a plausible TrueHD AU header (non-zero
|
|
// 12-bit length within 32 KiB) → corroborated. next_words = 0x100 = 256
|
|
// → 512 bytes <= 32768.
|
|
let mut buf = vec![0u8; 130];
|
|
buf[128] = 0x01; // (0x01<<8)|0x00 & 0xFFF = 0x100
|
|
buf[129] = 0x00;
|
|
assert!(ac3_boundary_corroborated(&buf, 128));
|
|
}
|
|
|
|
#[test]
|
|
fn ac3_not_corroborated_when_next_zero_length() {
|
|
// Bytes after the frame are zeros → next_words == 0 → NOT a plausible
|
|
// TrueHD AU and not an AC-3 sync → NOT corroborated (treat as TrueHD).
|
|
let buf = vec![0u8; 130]; // all zero after frame_bytes=128
|
|
assert!(!ac3_boundary_corroborated(&buf, 128));
|
|
}
|
|
|
|
#[test]
|
|
fn ac3_corroborated_when_too_few_trailing_bytes() {
|
|
// Fewer than 2 bytes follow the frame → can't judge → accept (next call
|
|
// sees the continuation). frame_bytes=128, buf=129 → 1 trailing byte.
|
|
let buf = vec![0u8; 129];
|
|
assert!(ac3_boundary_corroborated(&buf, 128));
|
|
}
|
|
|
|
#[test]
|
|
fn ac3_frame_at_head_needs_more_when_buffer_short() {
|
|
// < 6 bytes buffered → NeedMore (can't read the AC-3 header).
|
|
let mut parser = TrueHdParser::new();
|
|
parser.buf = vec![0x0B, 0x77, 0x00];
|
|
// Drive through parse: a short 0x0B77 head must wait, not emit.
|
|
let f = parser.parse(&make_pes(vec![0x0B, 0x77, 0x00], Some(0)));
|
|
assert!(f.is_empty());
|
|
}
|
|
|
|
// --- #2 sample rate from the major-sync rate nibble ---
|
|
|
|
/// Build a `format_info` word with the given `ratebits` (top nibble) and a
|
|
/// 7.1 8-channel mask (ch8 = 0x1F) in the low 13 bits — exactly the layout
|
|
/// §1.A pins, so the rate nibble and the channel masks are co-located in one
|
|
/// real word.
|
|
fn format_info_with(ratebits: u32) -> u32 {
|
|
((ratebits & 0xF) << 28) | 0x1F
|
|
}
|
|
|
|
#[test]
|
|
fn sample_rate_whitelist_real_rates() {
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0x0)), Some(48000));
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0x1)), Some(96000));
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0x2)), Some(192000));
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0x8)), Some(44100));
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0x9)), Some(88200));
|
|
assert_eq!(truehd_sample_rate_hz(format_info_with(0xA)), Some(176400));
|
|
}
|
|
|
|
#[test]
|
|
fn sample_rate_unknown_rate_falls_back_to_none() {
|
|
// 0xF is the explicit invalid code; 0x3/0xB are formula-only and not
|
|
// whitelisted; 0x7/0xE are reserved. None of them may produce a rate —
|
|
// the host must fall back to its container value, never write a wrong
|
|
// SamplingFrequency.
|
|
for bad in [0x3u32, 0x7, 0xB, 0xC, 0xD, 0xE, 0xF] {
|
|
assert_eq!(
|
|
truehd_sample_rate_hz(format_info_with(bad)),
|
|
None,
|
|
"ratebits {bad:#x} must not yield a rate"
|
|
);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn sample_rate_nibble_does_not_disturb_channel_decode() {
|
|
// Internal-consistency guard: with the 96 kHz nibble AND a 7.1 mask in
|
|
// the same word, the rate reads 96000 and the channels still read 8 —
|
|
// proving the rate nibble (bits 31..28) and the channel masks
|
|
// (bits 19..0) do not collide.
|
|
let fi = format_info_with(0x1);
|
|
assert_eq!(truehd_sample_rate_hz(fi), Some(96000));
|
|
assert_eq!(truehd_channels(fi), Some(8));
|
|
}
|
|
|
|
#[test]
|
|
fn sample_rate_from_stream_scans_major_sync() {
|
|
// [junk][0xF8726FBA][format_info: ratebits=0x1 (96k), ch8=0x1F]
|
|
let mut data = vec![0xAA, 0xBB];
|
|
data.extend_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
data.extend_from_slice(&format_info_with(0x1).to_be_bytes());
|
|
assert_eq!(truehd_sample_rate_from_stream(&data), Some(96000));
|
|
}
|
|
|
|
#[test]
|
|
fn sample_rate_from_stream_none_without_sync() {
|
|
let data = vec![0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88];
|
|
assert_eq!(truehd_sample_rate_from_stream(&data), None);
|
|
}
|
|
|
|
// --- #3 per-AU duration: family-aware, 48 kHz family byte-identical ---
|
|
|
|
#[test]
|
|
fn au_duration_48k_family_unchanged() {
|
|
// 48 / 96 / 192 kHz (ratebits 0x0/0x1/0x2) all keep the exact current
|
|
// 833_333 constant — the common case must never shift.
|
|
for rb in [0x0u32, 0x1, 0x2] {
|
|
assert_eq!(truehd_au_duration_ns(format_info_with(rb)), 833_333);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn au_duration_441k_family_is_907029() {
|
|
// 44.1 / 88.2 / 176.4 kHz (ratebits 0x8/0x9/0xA) → 907_029 ns.
|
|
for rb in [0x8u32, 0x9, 0xA] {
|
|
assert_eq!(truehd_au_duration_ns(format_info_with(rb)), 907_029);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn au_duration_unknown_rate_keeps_default() {
|
|
// An unrecognised/garbage rate nibble must not pick the 44.1 k value
|
|
// (note 0xF & 8 != 0): it falls back to the 833_333 default.
|
|
for rb in [0x3u32, 0x7, 0xB, 0xF] {
|
|
assert_eq!(truehd_au_duration_ns(format_info_with(rb)), 833_333);
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
fn parser_44k_major_sync_sets_907029_increment() {
|
|
// Two AUs: the first carries a major sync with ratebits=0x8 (44.1 k).
|
|
// After the parser reads it, the per-AU PTS increment must be 907_029.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut a1 = make_truehd_unit(200);
|
|
a1[4..8].copy_from_slice(&0xF872_6FBAu32.to_be_bytes()); // major sync
|
|
a1[8..12].copy_from_slice(&format_info_with(0x8).to_be_bytes()); // 44.1 k
|
|
let mut data = a1;
|
|
data.extend_from_slice(&make_truehd_unit(200));
|
|
let frames = parser.parse(&make_pes(data, Some(90000)));
|
|
assert_eq!(frames.len(), 2);
|
|
assert_eq!(
|
|
frames[1].pts_ns - frames[0].pts_ns,
|
|
907_029,
|
|
"44.1 k-family AU increments by 907_029 once the major sync is read"
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn parser_48k_major_sync_keeps_833333_increment() {
|
|
// Regression: a 48 k-family (ratebits=0x0) major sync keeps the exact
|
|
// current 833_333 increment.
|
|
let mut parser = TrueHdParser::new();
|
|
let mut a1 = make_truehd_unit(200);
|
|
a1[4..8].copy_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
a1[8..12].copy_from_slice(&format_info_with(0x0).to_be_bytes()); // 48 k
|
|
let mut data = a1;
|
|
data.extend_from_slice(&make_truehd_unit(200));
|
|
let frames = parser.parse(&make_pes(data, Some(90000)));
|
|
assert_eq!(frames.len(), 2);
|
|
assert_eq!(frames[1].pts_ns - frames[0].pts_ns, 833_333);
|
|
}
|
|
|
|
// --- #1 Atmos detection from num_substreams (msync[16] >> 4) ---
|
|
|
|
/// Build a demuxed chunk with one major sync whose 17th sync byte (offset
|
|
/// 16 from the 0xF8) has top nibble `num_substreams`. The AU is padded past
|
|
/// byte 16 so the substream count is reachable.
|
|
fn major_sync_with_substreams(num_substreams: u8) -> Vec<u8> {
|
|
let mut data = vec![0x00, 0x00]; // leading junk; scan is byte-aligned
|
|
let sync_off = data.len();
|
|
data.extend_from_slice(&0xF872_6FBAu32.to_be_bytes()); // bytes [off..off+4]
|
|
data.extend_from_slice(&format_info_with(0x0).to_be_bytes()); // format_info
|
|
// Pad up to and including byte `sync_off + 16`.
|
|
while data.len() <= sync_off + 16 {
|
|
data.push(0x00);
|
|
}
|
|
data[sync_off + 16] = (num_substreams & 0xF) << 4;
|
|
data
|
|
}
|
|
|
|
#[test]
|
|
fn atmos_true_when_four_substreams() {
|
|
// num_substreams = 4 → byte 16 = 0x40 → Atmos object substream present.
|
|
let data = major_sync_with_substreams(4);
|
|
assert_eq!(truehd_is_atmos_from_stream(&data), Some(true));
|
|
}
|
|
|
|
#[test]
|
|
fn atmos_false_when_three_substreams() {
|
|
// num_substreams = 3 (plain 7.1 TrueHD) → byte 16 = 0x30 → not Atmos.
|
|
let data = major_sync_with_substreams(3);
|
|
assert_eq!(truehd_is_atmos_from_stream(&data), Some(false));
|
|
}
|
|
|
|
#[test]
|
|
fn atmos_none_when_au_too_short_for_substream_byte() {
|
|
// Major sync present but the chunk ends before byte sync_off+16 → None,
|
|
// never a false Atmos. Sync at offset 0; only format_info follows.
|
|
let mut data = 0xF872_6FBAu32.to_be_bytes().to_vec();
|
|
data.extend_from_slice(&format_info_with(0x0).to_be_bytes()); // 8 bytes total
|
|
assert_eq!(truehd_is_atmos_from_stream(&data), None);
|
|
}
|
|
|
|
#[test]
|
|
fn atmos_none_without_major_sync() {
|
|
let data = vec![0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88];
|
|
assert_eq!(truehd_is_atmos_from_stream(&data), None);
|
|
}
|
|
|
|
#[test]
|
|
fn sync_info_combines_channels_rate_and_atmos() {
|
|
// One scan yields all three facts: 7.1 channels, 96 kHz, 4 substreams.
|
|
let data = {
|
|
let mut d = vec![0x00, 0x00];
|
|
let off = d.len();
|
|
d.extend_from_slice(&0xF872_6FBAu32.to_be_bytes());
|
|
d.extend_from_slice(&format_info_with(0x1).to_be_bytes()); // 96k + 7.1
|
|
while d.len() <= off + 16 {
|
|
d.push(0x00);
|
|
}
|
|
d[off + 16] = 0x40; // 4 substreams
|
|
d
|
|
};
|
|
let info = truehd_sync_info_from_stream(&data).expect("major sync found");
|
|
assert_eq!(truehd_channels(info.format_info), Some(8));
|
|
assert_eq!(truehd_sample_rate_hz(info.format_info), Some(96000));
|
|
assert_eq!(info.is_atmos, Some(true));
|
|
}
|
|
}
|