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use std::{
error::Error,
ffi::{CString, c_void},
fmt::Display,
path::Path,
};
use libflac_sys::{
FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED,
FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE,
FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS,
FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR, FLAC__STREAM_DECODER_INIT_STATUS_OK,
FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER, FLAC__StreamDecoder,
FLAC__StreamDecoderInitStatus, FLAC__bool, FLAC__stream_decoder_finish,
FLAC__stream_decoder_get_bits_per_sample, FLAC__stream_decoder_get_channels,
FLAC__stream_decoder_get_sample_rate, FLAC__stream_decoder_init_file, FLAC__stream_decoder_new,
FLAC__stream_decoder_process_single, FLAC__stream_decoder_set_md5_checking,
};
#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
#[repr(u32)]
pub enum FlacDecoderInitError {
AlreadyInitialized = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED,
ErrorOpeningFile = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE,
InvalidCallbacks = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS,
MemoryAllocationError = FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR,
UnsupportedContainer = FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER,
}
impl Error for FlacDecoderInitError {}
impl Display for FlacDecoderInitError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{self:?}")
}
}
impl From<FlacDecoderInitError> for FLAC__StreamDecoderInitStatus {
fn from(val: FlacDecoderInitError) -> Self {
val as FLAC__StreamDecoderInitStatus
}
}
impl TryFrom<FLAC__StreamDecoderInitStatus> for FlacDecoderInitError {
type Error = ();
#[allow(non_upper_case_globals)]
fn try_from(raw: FLAC__StreamDecoderInitStatus) -> Result<FlacDecoderInitError, ()> {
Ok(match raw {
FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED => {
FlacDecoderInitError::AlreadyInitialized
}
FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE => {
FlacDecoderInitError::ErrorOpeningFile
}
FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS => {
FlacDecoderInitError::InvalidCallbacks
}
FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR => {
FlacDecoderInitError::MemoryAllocationError
}
FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER => {
FlacDecoderInitError::UnsupportedContainer
}
_ => return Err(()),
})
}
}
fn convert_path(path: &Path) -> CString {
CString::new(path.to_str().expect("non-UTF-8 filename")).expect("filename has internal NULs")
}
pub(crate) struct FlacDecoder(pub *mut FLAC__StreamDecoder);
impl FlacDecoder {
pub(crate) fn new() -> Self {
FlacDecoder(unsafe { FLAC__stream_decoder_new() })
}
pub(crate) fn init_decode_from_file<P: AsRef<Path>>(
&self,
file: &P,
buf: &mut Vec<i32>,
) -> Result<(), FlacDecoderInitError> {
unsafe {
FLAC__stream_decoder_set_md5_checking(self.0, true as FLAC__bool);
}
let filename = convert_path(file.as_ref());
unsafe {
let result: FLAC__StreamDecoderInitStatus = FLAC__stream_decoder_init_file(
self.0,
filename.as_ptr(),
None,
None,
None,
buf.as_mut_ptr() as *mut c_void,
);
if result != FLAC__STREAM_DECODER_INIT_STATUS_OK {
return Err(FlacDecoderInitError::try_from(result).unwrap());
}
}
Ok(())
}
pub(crate) fn decode_frame(&self) -> Result<(), ()> {
if unsafe { FLAC__stream_decoder_process_single(self.0) } != 0 {
Ok(())
} else {
Err(())
}
}
pub(crate) fn get_channels(&self) -> u32 {
unsafe { FLAC__stream_decoder_get_channels(self.0) }
}
pub(crate) fn get_bps(&self) -> u32 {
unsafe { FLAC__stream_decoder_get_bits_per_sample(self.0) }
}
pub(crate) fn get_samplerate(&self) -> u32 {
unsafe { FLAC__stream_decoder_get_sample_rate(self.0) }
}
}
impl Drop for FlacDecoder {
fn drop(&mut self) {
if !(self.0.is_null()) {
unsafe { FLAC__stream_decoder_finish(self.0) };
}
}
}
|
