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// Copyright 2019 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
mod arguments;
use std::error;
use std::fmt;
use std::fs::File;
use std::io::{self, BufReader, BufWriter, Read, Write};
use std::os::raw::c_int;
use std::sync::atomic::{AtomicBool, Ordering};
use audio_streams::{SampleFormat, StreamSource};
use libcras::CrasClient;
use sys_util::{register_signal_handler, set_rt_prio_limit, set_rt_round_robin};
use crate::arguments::{AudioOptions, Command};
#[derive(Debug)]
pub enum Error {
CreateStream(Box<dyn error::Error>),
FetchStream(Box<dyn error::Error>),
Io(io::Error),
Libcras(libcras::Error),
ParseArgs(arguments::Error),
SysUtil(sys_util::Error),
}
impl error::Error for Error {}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
use Error::*;
match self {
CreateStream(e) => write!(f, "Failed to create stream: {}", e),
FetchStream(e) => write!(f, "Failed to fetch buffer from stream: {}", e),
Io(e) => write!(f, "IO Error: {}", e),
Libcras(e) => write!(f, "Libcras Error: {}", e),
ParseArgs(e) => write!(f, "Failed to parse arguments: {}", e),
SysUtil(e) => write!(f, "SysUtil Error: {}", e),
}
}
}
type Result<T> = std::result::Result<T, Error>;
static INTERRUPTED: AtomicBool = AtomicBool::new(false);
extern "C" fn sigint_handler() {
// Check if we've already received one SIGINT. If we have, the program may
// be misbehaving and not terminating, so to be safe we'll forcefully exit.
if INTERRUPTED.load(Ordering::Acquire) {
std::process::exit(1);
}
INTERRUPTED.store(true, Ordering::Release);
}
fn add_sigint_handler() -> Result<()> {
const SIGINT: c_int = 2;
let result = unsafe { register_signal_handler(SIGINT, sigint_handler) };
result.map_err(Error::SysUtil)
}
fn set_priority_to_realtime() {
const AUDIO_THREAD_RTPRIO: u16 = 10;
if set_rt_prio_limit(AUDIO_THREAD_RTPRIO as u64).is_err()
|| set_rt_round_robin(AUDIO_THREAD_RTPRIO as i32).is_err()
{
println!("Attempt to use real-time priority failed, running with default scheduler.");
}
}
fn channel_string(num_channels: usize) -> String {
match num_channels {
1 => "Mono".to_string(),
2 => "Stereo".to_string(),
_ => format!("{} Channels", num_channels),
}
}
fn sample_format_string(format: SampleFormat) -> String {
use SampleFormat::*;
let s = match format {
U8 => "Unsigned 8 bit",
S16LE => "Signed 16 bit Little Endian",
S24LE => "Signed 24 bit Little Endian",
S32LE => "Signed 32 bit Little Endian",
};
s.to_string()
}
fn playback(opts: AudioOptions) -> Result<()> {
let num_channels = opts.num_channels.unwrap_or(2);
let format = opts.format.unwrap_or(SampleFormat::S16LE);
let frame_rate = opts.frame_rate.unwrap_or(48000);
let mut sample_source: Box<dyn Read> = Box::new(BufReader::new(
File::open(&opts.file_name).map_err(Error::Io)?,
));
println!(
"Playing raw data '{}' : {}, Rate {} Hz, {}",
opts.file_name.display(),
sample_format_string(format),
frame_rate,
channel_string(num_channels)
);
let mut cras_client = CrasClient::new().map_err(Error::Libcras)?;
let (_control, mut stream) = cras_client
.new_playback_stream(
num_channels,
format,
frame_rate,
opts.buffer_size.unwrap_or(256),
)
.map_err(Error::CreateStream)?;
set_priority_to_realtime();
add_sigint_handler()?;
while !INTERRUPTED.load(Ordering::Acquire) {
let mut buffer = stream.next_playback_buffer().map_err(Error::FetchStream)?;
let frame_size = num_channels * format.sample_bytes();
let frames = buffer.frame_capacity();
let mut chunk = (&mut sample_source).take((frames * frame_size) as u64);
let transferred = io::copy(&mut chunk, &mut buffer).map_err(Error::Io)?;
if transferred == 0 {
break;
}
}
// Stream and client should gracefully be closed out of this scope
Ok(())
}
fn capture(opts: AudioOptions) -> Result<()> {
let num_channels = opts.num_channels.unwrap_or(2);
let format = opts.format.unwrap_or(SampleFormat::S16LE);
let frame_rate = opts.frame_rate.unwrap_or(48000);
let mut sample_sink: Box<dyn Write> = Box::new(BufWriter::new(
File::create(&opts.file_name).map_err(Error::Io)?,
));
println!(
"Recording raw data '{}' : {}, Rate {} Hz, {}",
opts.file_name.display(),
sample_format_string(format),
frame_rate,
channel_string(num_channels)
);
let mut cras_client = CrasClient::new().map_err(Error::Libcras)?;
cras_client.enable_cras_capture();
let (_control, mut stream) = cras_client
.new_capture_stream(
num_channels,
format,
frame_rate,
opts.buffer_size.unwrap_or(256),
)
.map_err(Error::CreateStream)?;
set_priority_to_realtime();
add_sigint_handler()?;
while !INTERRUPTED.load(Ordering::Acquire) {
let mut buf = stream.next_capture_buffer().map_err(Error::FetchStream)?;
io::copy(&mut buf, &mut sample_sink).map_err(Error::Io)?;
}
Ok(())
}
fn run() -> Result<()> {
let args: Vec<String> = std::env::args().collect();
let opts = match AudioOptions::parse_from_args(&args).map_err(Error::ParseArgs)? {
None => return Ok(()),
Some(v) => v,
};
match opts.command {
Command::Capture => capture(opts),
Command::Playback => playback(opts),
}
}
fn main() {
// Use run() instead of returning a Result from main() so that we can print
// errors using Display instead of Debug.
if let Err(e) = run() {
eprintln!("{}", e);
}
}
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