Start decoding MQA bitstream
This commit is contained in:
parent
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GPG key ID:
EE5227935FE3FF18
577
rust/minimqa/Cargo.lock
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rust/minimqa/Cargo.lock
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|
||||
"symphonia-bundle-flac",
|
||||
"symphonia-codec-pcm",
|
||||
"symphonia-core",
|
||||
"symphonia-format-riff",
|
||||
"symphonia-metadata",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-bundle-flac"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "72e34f34298a7308d4397a6c7fbf5b84c5d491231ce3dd379707ba673ab3bd97"
|
||||
dependencies = [
|
||||
"log",
|
||||
"symphonia-core",
|
||||
"symphonia-metadata",
|
||||
"symphonia-utils-xiph",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-codec-pcm"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f395a67057c2ebc5e84d7bb1be71cce1a7ba99f64e0f0f0e303a03f79116f89b"
|
||||
dependencies = [
|
||||
"log",
|
||||
"symphonia-core",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-core"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "798306779e3dc7d5231bd5691f5a813496dc79d3f56bf82e25789f2094e022c3"
|
||||
dependencies = [
|
||||
"arrayvec",
|
||||
"bitflags",
|
||||
"bytemuck",
|
||||
"lazy_static",
|
||||
"log",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-format-riff"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "05f7be232f962f937f4b7115cbe62c330929345434c834359425e043bfd15f50"
|
||||
dependencies = [
|
||||
"extended",
|
||||
"log",
|
||||
"symphonia-core",
|
||||
"symphonia-metadata",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-metadata"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bc622b9841a10089c5b18e99eb904f4341615d5aa55bbf4eedde1be721a4023c"
|
||||
dependencies = [
|
||||
"encoding_rs",
|
||||
"lazy_static",
|
||||
"log",
|
||||
"symphonia-core",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "symphonia-utils-xiph"
|
||||
version = "0.5.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "484472580fa49991afda5f6550ece662237b00c6f562c7d9638d1b086ed010fe"
|
||||
dependencies = [
|
||||
"symphonia-core",
|
||||
"symphonia-metadata",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "2.0.79"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-ident",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.13"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
|
||||
|
||||
[[package]]
|
||||
name = "utf8parse"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.52.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
12
rust/minimqa/Cargo.toml
Normal file
12
rust/minimqa/Cargo.toml
Normal file
|
|
@ -0,0 +1,12 @@
|
|||
[package]
|
||||
name = "minimqa"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
bitstream-io = "2.5.3"
|
||||
clap = { version = "4.5.20", features = ["derive"] }
|
||||
color-eyre = { version = "0.6.3", default-features = false }
|
||||
env_logger = "0.11.5"
|
||||
log = "0.4.22"
|
||||
symphonia = { version = "0.5.4", default-features = false, features = ["flac", "pcm", "wav"] }
|
||||
161
rust/minimqa/src/main.rs
Normal file
161
rust/minimqa/src/main.rs
Normal file
|
|
@ -0,0 +1,161 @@
|
|||
use std::{
|
||||
collections::VecDeque,
|
||||
fs::File,
|
||||
io::Read,
|
||||
path::{Path, PathBuf},
|
||||
};
|
||||
|
||||
use clap::Parser;
|
||||
use color_eyre::eyre::{self, OptionExt};
|
||||
use symphonia::core::{
|
||||
audio::{Channels, SampleBuffer},
|
||||
codecs::{Decoder, DecoderOptions},
|
||||
formats::FormatReader,
|
||||
io::MediaSourceStream,
|
||||
};
|
||||
|
||||
/// Full 40-bit synchronization, including the packet type and 36-bit magic.
|
||||
/// Stored as msb-first for easy searching, though MQA packets are lsb-first
|
||||
const SYNC: u64 = 0xabe0498c88;
|
||||
|
||||
#[derive(Parser)]
|
||||
#[command(version, about)]
|
||||
struct Args {
|
||||
/// Input file
|
||||
#[arg(short, long)]
|
||||
input: PathBuf,
|
||||
}
|
||||
|
||||
fn main() -> eyre::Result<()> {
|
||||
env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
|
||||
color_eyre::install()?;
|
||||
|
||||
let args = Args::parse();
|
||||
let reader = MQAReader::open(&args.input)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub struct MQAReader {
|
||||
decoder: Box<dyn Decoder>,
|
||||
format: Box<dyn FormatReader>,
|
||||
track_id: u32,
|
||||
|
||||
shift: u32,
|
||||
|
||||
decoded: VecDeque<u8>,
|
||||
remaining_bits: u8,
|
||||
num_remaining_bits: u8,
|
||||
}
|
||||
|
||||
impl MQAReader {
|
||||
pub fn open(filename: &Path) -> eyre::Result<Self> {
|
||||
let input_file = Box::new(File::open(filename)?);
|
||||
let mss = MediaSourceStream::new(input_file, Default::default());
|
||||
let probed = symphonia::default::get_probe().format(
|
||||
&Default::default(),
|
||||
mss,
|
||||
&Default::default(),
|
||||
&Default::default(),
|
||||
)?;
|
||||
let format = probed.format;
|
||||
let track = format
|
||||
.default_track()
|
||||
.ok_or_eyre("No default track in file")?;
|
||||
let track_id = track.id;
|
||||
let decoder = symphonia::default::get_codecs()
|
||||
.make(&track.codec_params, &DecoderOptions { verify: true })?;
|
||||
|
||||
let mut result = Self {
|
||||
decoder,
|
||||
format,
|
||||
track_id,
|
||||
shift: u32::MAX,
|
||||
decoded: VecDeque::new(),
|
||||
remaining_bits: 0,
|
||||
num_remaining_bits: 0,
|
||||
};
|
||||
|
||||
let first_packet = result.read_packet_interleaved()?;
|
||||
let (shift, offset) =
|
||||
Self::find_sync(first_packet.samples()).ok_or_eyre("No sync packet")?;
|
||||
log::info!("Found MQA sync at shift {}, offset {}", shift, offset);
|
||||
|
||||
result.shift = shift;
|
||||
result.decode_interleaved(&first_packet.samples()[offset * 2..]);
|
||||
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
fn read_packet_interleaved(&mut self) -> eyre::Result<SampleBuffer<u32>> {
|
||||
loop {
|
||||
let packet = self.format.next_packet()?;
|
||||
if packet.track_id() != self.track_id {
|
||||
continue;
|
||||
}
|
||||
let audio_buf = self.decoder.decode(&packet)?;
|
||||
let spec = audio_buf.spec();
|
||||
if spec.channels != Channels::FRONT_LEFT | Channels::FRONT_RIGHT {
|
||||
eyre::bail!("MQA only supports stereo");
|
||||
}
|
||||
|
||||
let mut sample_buf = SampleBuffer::new(audio_buf.capacity() as u64, *spec);
|
||||
sample_buf.copy_interleaved_ref(audio_buf);
|
||||
|
||||
return Ok(sample_buf);
|
||||
}
|
||||
}
|
||||
|
||||
fn decode_interleaved(&mut self, sample_buf: &[u32]) {
|
||||
self.decoded.reserve(sample_buf.len() / 16);
|
||||
|
||||
let mut accumulator = self.remaining_bits;
|
||||
let mut num_bits_used = self.num_remaining_bits;
|
||||
|
||||
for pair in sample_buf.chunks_exact(2) {
|
||||
let bit = (((pair[0] ^ pair[1]) >> self.shift) & 1) as u8;
|
||||
accumulator = accumulator << 1 | bit;
|
||||
num_bits_used += 1;
|
||||
if num_bits_used == 8 {
|
||||
self.decoded.push_back(accumulator);
|
||||
num_bits_used = 0;
|
||||
accumulator = 0;
|
||||
}
|
||||
}
|
||||
self.remaining_bits = accumulator;
|
||||
self.num_remaining_bits = num_bits_used;
|
||||
}
|
||||
|
||||
fn find_sync(samples: &[u32]) -> Option<(u32, usize)> {
|
||||
for shift in 8u32..24 {
|
||||
let mut accumulator: u64 = 0;
|
||||
for (idx, pair) in samples.chunks_exact(2).enumerate() {
|
||||
let bit = (((pair[0] ^ pair[1]) >> shift) & 1) as u64;
|
||||
accumulator = (accumulator << 1 | bit) & 0xff_ffff_ffff;
|
||||
|
||||
if accumulator == SYNC {
|
||||
return Some((shift, idx - 39));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
impl Read for MQAReader {
|
||||
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
|
||||
while self.decoded.len() < buf.len() {
|
||||
let Ok(sample_buf) = self.read_packet_interleaved() else {
|
||||
break;
|
||||
};
|
||||
self.decode_interleaved(sample_buf.samples());
|
||||
}
|
||||
let copy_size = buf.len().min(self.decoded.len());
|
||||
for item in buf.iter_mut().take(copy_size) {
|
||||
*item = self.decoded.pop_front().unwrap();
|
||||
}
|
||||
|
||||
Ok(copy_size)
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue