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|
use crate::helper::ReadExt;
use anyhow::{Ok, Result, bail};
use log::debug;
use std::io::{Cursor, Read, Seek, SeekFrom};
pub struct FmodSoundBank<T> {
inner: T,
data_base_offset: u64,
header: FsbHeader,
pub streams: Vec<StreamInfo>,
}
pub struct StreamInfo {
header: StreamHeader,
}
struct FsbHeader {
version: u32,
num_streams: u32,
stream_headers_size: u32,
name_table_size: u32,
data_size: u32,
format: FsbFormat,
}
#[repr(u32)]
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum FsbFormat {
None,
Pcm8,
Pcm16,
Pcm24,
Pcm32,
PcmFloat,
GcAdPcm,
ImaAdPcm,
Vag,
HeVag,
Xma,
Mpeg,
Celt,
At9,
Xwma,
Vorbis,
FAdPcm,
Opus,
}
impl FsbHeader {
pub fn read(mut f: impl Read) -> Result<Self> {
let mut buf = [0; 4];
f.read_exact(&mut buf)?;
if &buf != b"FSB5" {
bail!("invalid magic")
}
let version = f.read_u32_le()?;
let num_streams = f.read_u32_le()?;
let stream_headers_size = f.read_u32_le()?;
let name_table_size = f.read_u32_le()?;
let data_size = f.read_u32_le()?;
let format = FsbFormat::from_num(f.read_u32_le()?)?;
debug!("FSB version: {version}");
debug!("Sample Count: {num_streams}");
debug!("Format: {format:?}");
f.discard(32)?;
Ok(Self {
data_size,
format,
name_table_size,
num_streams,
stream_headers_size,
version,
})
}
}
impl FsbFormat {
pub fn from_num(x: u32) -> Result<Self> {
if x < 18 {
Ok(unsafe { std::mem::transmute(x) })
} else {
bail!("audio format out of range")
}
}
}
impl<T: Read + Seek> FmodSoundBank<T> {
pub fn open(mut file: T) -> Result<Self> {
let header = FsbHeader::read(&mut file)?;
let mut streams = Vec::new();
for _ in 0..header.num_streams {
let header = StreamHeader::from_packed(file.read_u64_le()?)?;
eprintln!("{header:?}");
let mut next = header.next_chunk;
while next {
let chunk = ChunkHeader::from_packed(file.read_u32_le()?)?;
match chunk.kind {
k => todo!("chunk kind {k:?}"),
}
next = chunk.next_chunk;
}
streams.push(StreamInfo { header });
}
if header.name_table_size != 0 {
let mut offsets = Vec::new();
for _ in 0..header.num_streams {
offsets.push(file.read_u32_le()?);
}
let mut buf = vec![0u8; header.name_table_size as usize];
file.read_exact(&mut buf)?;
let mut buf = Cursor::new(buf);
let mut names = Vec::new();
for o in offsets {
buf.seek(SeekFrom::Start(o as u64))?;
names.push(buf.read_cstr()?);
}
}
let data_base_offset = file.stream_position()?;
Ok(Self {
data_base_offset,
header,
streams,
inner: file,
})
}
pub fn read_stream(&mut self, n: usize) -> Result<()> {
let info = &self.streams[n];
let start = info.header.data_offset;
let end = self
.streams
.get(n + 1)
.map_or(self.header.data_size, |s| s.header.data_offset);
let mut data = vec![0; (end - start) as usize];
debug!("{} {}", start, end);
self.inner
.seek(SeekFrom::Start(start as u64 + self.data_base_offset))?;
self.inner.read_exact(&mut data)?;
Ok(())
}
}
#[derive(Debug)]
struct StreamHeader {
next_chunk: bool,
samplerate: u32,
channels: u8,
data_offset: u32,
samples: u32,
}
impl StreamHeader {
const MASKS: &[u64] = &[
0b1000000000000000000000000000000000000000000000000000000000000000,
0b0111100000000000000000000000000000000000000000000000000000000000,
0b0000011000000000000000000000000000000000000000000000000000000000,
0b0000000111111111111111111111111111000000000000000000000000000000,
0b0000000000000000000000000000000000111111111111111111111111111111,
];
pub fn from_packed(x: u64) -> Result<Self> {
let next_chunk = x & Self::MASKS[0] != 0;
let samplerate_raw = (x & Self::MASKS[1]) >> Self::MASKS[1].trailing_zeros();
let channels_raw = x & Self::MASKS[2] >> Self::MASKS[2].trailing_zeros();
let data_offset = (x & Self::MASKS[3]) >> Self::MASKS[3].trailing_zeros();
let samples = x & Self::MASKS[4];
Ok(Self {
next_chunk,
samplerate: match samplerate_raw {
0 => 4000,
1 => 8000,
2 => 11000,
3 => 11025,
4 => 16000,
5 => 22050,
6 => 24000,
7 => 32000,
8 => 44100,
9 => 48000,
10 => 96000,
x => bail!("invalid sampling frequency: {x}"),
},
channels: match channels_raw {
0 => 1,
1 => 2,
2 => 4,
3 => 8,
x => bail!("invalid channel count: {x}"),
},
data_offset: data_offset as u32 * 16,
samples: samples as u32,
})
}
}
struct ChunkHeader {
next_chunk: bool,
size: u32,
kind: ChunkKind,
}
impl ChunkHeader {
const MASKS: &[u32] = &[
0b10000000000000000000000000000000,
0b01111111111111111111111110000000,
0b00000000000000000000000001111111,
];
pub fn from_packed(x: u32) -> Result<Self> {
let next_chunk = x & Self::MASKS[0] != 0;
let size = (x & Self::MASKS[1]) >> Self::MASKS[1].trailing_zeros();
let kind = x & Self::MASKS[2];
Ok(Self {
kind: ChunkKind::from_num(kind as u8)?,
size,
next_chunk,
})
}
}
#[repr(u8)]
#[derive(Debug, Clone, Copy, PartialEq)]
enum ChunkKind {
Channels,
Samplerate,
Loop,
Comment,
XmaSeekTable,
DspCoefficients,
Atrac9Config,
XwmaConfig,
VorbisSeekTable,
PeakVolume,
VorbisIntraLayers,
OpusDataSize,
}
impl ChunkKind {
pub fn from_num(n: u8) -> Result<Self> {
if n < 13 {
Ok(unsafe { std::mem::transmute(n) })
} else {
bail!("unknown chunk type {n:02x}")
}
}
}
|
