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use std::{ffi::{c_int, c_void}, sync::mpsc, mem::swap};
use fl2k_ampliphase::{fl2k_dev_t, fl2k_get_device_count, fl2k_open, fl2k_close, fl2k_stop_tx, fl2k_set_sample_rate, fl2k_get_sample_rate, fl2k_start_tx, FL2K_BUF_LEN};
const BUF_LEN : usize = FL2K_BUF_LEN as usize;
#[derive(Debug)]
pub enum FL2KError {
InvalidParam,
NoDevice,
NotFound,
Busy,
Timeout,
NoMem,
Unknown(c_int)
}
fn handle_return_value(val: c_int) -> Result<(), FL2KError> {
if val == fl2k_ampliphase::fl2k_error_FL2K_SUCCESS { Ok(()) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_TRUE { Ok(()) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_INVALID_PARAM { Err(FL2KError::InvalidParam) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_NO_DEVICE { Err(FL2KError::NoDevice) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_NOT_FOUND { Err(FL2KError::NotFound) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_BUSY { Err(FL2KError::Busy) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_TIMEOUT { Err(FL2KError::Timeout) }
else if val == fl2k_ampliphase::fl2k_error_FL2K_ERROR_NO_MEM { Err(FL2KError::NoMem) }
else { Err(FL2KError::Unknown(val)) }
}
pub fn get_device_count() -> u32 {
unsafe { fl2k_get_device_count() }
}
pub struct FL2K {
device: *mut fl2k_dev_t,
callback_ctx: Box<CallbackCtx>,
tx : mpsc::SyncSender<(Vec<i8>, Vec<i8>)>,
r_buf : Vec<i8>,
g_buf : Vec<i8>
}
pub struct CallbackCtx {
// All three buffers must have same length!
r_buf: Vec<i8>,
g_buf: Vec<i8>,
rg_bufs_channel: mpsc::Receiver<(Vec<i8>, Vec<i8>)>,
underflow_count: u32,
buffer_underflows: u32,
abort: bool,
}
extern "C" fn tx_callback(data_info: *mut fl2k_ampliphase::fl2k_data_info_t) {
unsafe {
let ctx = (*data_info).ctx as *mut CallbackCtx;
if (*data_info).device_error != 0 {
(*ctx).abort = true;
}
else {
(*ctx).underflow_count = (*data_info).underflow_cnt;
match (*ctx).rg_bufs_channel.try_recv() {
Ok((r, g)) => {
(*data_info).sampletype_signed = 1;
(*ctx).r_buf = r;
(*ctx).g_buf = g;
(*data_info).r_buf = (*ctx).r_buf.as_mut_ptr();
(*data_info).g_buf = (*ctx).g_buf.as_mut_ptr();
},
Err(_) => {
(*ctx).buffer_underflows += 1;
eprintln!("FL2K buffers not ready on callback");
},
}
}
}
}
impl FL2K {
pub fn open(device_index: u32) -> Result<Self, FL2KError> {
let (tx, rx) = mpsc::sync_channel(2);
let ctx = CallbackCtx {
r_buf: Vec::new(),
g_buf: Vec::new(),
rg_bufs_channel: rx,
underflow_count: 0,
buffer_underflows: 0,
abort: false,
};
unsafe {
let r_buf = Vec::with_capacity(2 * BUF_LEN);
let g_buf = Vec::with_capacity(2 * BUF_LEN);
let mut fl2k = FL2K { device: std::mem::zeroed(), callback_ctx: Box::new(ctx), tx, r_buf, g_buf };
handle_return_value(fl2k_open(&mut fl2k.device, device_index))?;
Ok(fl2k)
}
}
pub fn set_sample_rate(&mut self, sample_rate: u32) -> Result<(), FL2KError> {
let r = unsafe { fl2k_set_sample_rate(self.device, sample_rate) };
if r < 0 {
handle_return_value(r)
}
else {
Ok(())
}
}
pub fn get_sample_rate(&mut self) -> Result<u32, FL2KError> {
let sr = unsafe { fl2k_get_sample_rate(self.device) };
if sr == 0 { Err(FL2KError::Unknown(0)) } else { Ok(sr) }
}
pub fn start_tx(&mut self) -> Result<(), FL2KError> {
let r = unsafe { fl2k_start_tx(self.device, Some(tx_callback), self.callback_ctx.as_mut() as *mut CallbackCtx as *mut c_void, 0) };
handle_return_value(r)
}
pub fn stop_tx(&self) -> Result<(), FL2KError> {
handle_return_value( unsafe { fl2k_stop_tx(self.device) } )
}
pub fn send(&mut self, mut r_buf: Vec<i8>, mut g_buf: Vec<i8>) -> bool {
if r_buf.len() != g_buf.len() {
panic!("r_buf and g_buf must have same length");
}
self.r_buf.append(&mut r_buf);
self.g_buf.append(&mut g_buf);
if self.r_buf.len() >= BUF_LEN {
let mut r = self.r_buf.split_off(BUF_LEN);
let mut g = self.g_buf.split_off(BUF_LEN);
/* self.r_buf contains head, r contains tail. Swap them, as we want to give the head and keep the tail. */
swap(&mut r, &mut self.r_buf);
swap(&mut g, &mut self.g_buf);
self.tx.send((r, g)).is_ok()
}
else {
true
}
}
}
impl Drop for FL2K {
fn drop(&mut self) {
match unsafe {
handle_return_value(fl2k_close(self.device))
} {
Ok(_) => (),
Err(e) => eprintln!("Failed to close FL2K: {:?}", e),
}
}
}
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