257 lines
5.7 KiB
Rust
257 lines
5.7 KiB
Rust
use std::{
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sync::{
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Arc,
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Condvar,
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Mutex,
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},
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thread::{
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self,
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sleep,
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},
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time::Duration,
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};
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use anyhow::{
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anyhow,
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bail,
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Result,
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};
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use cpal::traits::{
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DeviceTrait,
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HostTrait,
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};
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mod decoder;
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fn main () -> Result <()> {
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let args: Vec <_> = std::env::args ().collect ();
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match args.get (1).map (|s| &s[..]) {
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None => bail! ("First argument must be a subcommand like `play`"),
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Some ("debug") => cmd_debug (&args [1..]),
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Some ("play") => cmd_play (&args [1..]),
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Some (_) => bail! ("Unrecognized subcommand"),
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}
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}
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fn cmd_debug (args: &[String]) -> Result <()> {
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tracing_subscriber::fmt::init ();
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let filename = args.get (1)
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.map (|s| s.to_string ())
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.unwrap_or_else (|| "test-short.m4a".to_string ());
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let mut decoder = decoder::Decoder::new (&filename)?;
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let mut pcm_buffers = decoder::PcmBuffers::default ();
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tracing::debug! ("Constructed decoder");
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sleep (Duration::from_secs (3));
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tracing::debug! ("Decoding...");
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'decoding: loop {
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while pcm_buffers.samples_available () < 48_000 {
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if ! decoder.fill_buffer (&mut pcm_buffers)? {
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tracing::info! ("Decoder finished");
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break 'decoding;
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}
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}
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while pcm_buffers.samples_available () > 0 {
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let mut buf = vec! [0.0f32; pcm_buffers.samples_available ()];
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pcm_buffers.consume_exact (&mut buf);
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}
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}
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sleep (Duration::from_secs (3));
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tracing::debug! ("Dropping resampler...");
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dbg! (decoder.resampler.delay ());
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drop (decoder.resampler);
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sleep (Duration::from_secs (3));
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tracing::debug! ("Dropping decoder...");
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drop (decoder.decoder);
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sleep (Duration::from_secs (3));
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tracing::debug! ("Dropping input_ctx...");
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drop (decoder.input_ctx);
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sleep (Duration::from_secs (3));
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Ok (())
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}
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fn cmd_play (args: &[String]) -> Result <()> {
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tracing_subscriber::fmt::init ();
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let filename = args.get (1)
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.map (|s| s.to_string ())
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.unwrap_or_else (|| "test-short.m4a".to_string ());
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let pair = Arc::new ((Mutex::new (decoder::SharedState::default ()), Condvar::new ()));
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let pair2 = Arc::clone (&pair);
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let pair3 = Arc::clone (&pair);
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let thread_decoder = thread::spawn (move|| {
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let (lock, cvar) = &*pair2;
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let mut decoder = decoder::Decoder::new (&filename)?;
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'decoder_thread: loop {
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// tracing::trace! ("decode thread parking");
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let mut decoder_state = cvar.wait_while (lock.lock ().unwrap (), |decoder_state| {
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decoder_state.pcm_buffers.samples_available () >= 12_000 &&
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! decoder_state.quit
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}).unwrap ();
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if decoder_state.quit {
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break 'decoder_thread;
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}
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//dbg! (resampler.delay ());
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let pcm_buffers = &mut decoder_state.pcm_buffers;
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while pcm_buffers.samples_available () < 24_000 {
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// tracing::trace! ("Decoder is trying to work...");
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if ! decoder.fill_buffer (pcm_buffers)? {
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tracing::info! ("Decoder thread is out of work, quitting");
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break 'decoder_thread;
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}
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}
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}
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Ok::<_, anyhow::Error> (())
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});
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let host = cpal::default_host ();
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let device = host.default_output_device ().ok_or_else (|| anyhow! ("can't open cpal device"))?;
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let mut supported_configs_range = device.supported_output_configs ()?
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.filter (|c| c.channels () == 2 && c.sample_format () == cpal::SampleFormat::F32);
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let config = supported_configs_range.next ()
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.ok_or_else (|| anyhow! ("can't get stereo f32 audio output"))?
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.with_sample_rate (cpal::SampleRate (decoder::SAMPLE_RATE))
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.config ();
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let pcm_quit = Arc::new ((Mutex::new (false), Condvar::new ()));
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let pcm_quit2 = Arc::clone (&pcm_quit);
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let stream = device.build_output_stream (
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&config,
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move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
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let (lock, cvar) = &*pair;
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let mut decoder_state = match lock.lock () {
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Ok (x) => x,
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Err (_) => return,
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};
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let pcm_buffers = &mut decoder_state.pcm_buffers;
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if ! pcm_buffers.consume_exact (data) {
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// tracing::warn! ("PCM buffer underflow");
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for x in data {
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*x = 0.0;
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}
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let (lock, cvar) = &*pcm_quit;
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let mut pcm_quit = lock.lock ().unwrap ();
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*pcm_quit = true;
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cvar.notify_one ();
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}
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cvar.notify_one ();
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},
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move |_err| {
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// react to errors here.
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},
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);
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// sleep (std::time::Duration::from_secs (3 * 60 + 40));
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tracing::debug! ("Joining decoder thread...");
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if false {
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let mut decoder_state = pair3.0.lock ().unwrap ();
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decoder_state.quit = true;
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pair3.1.notify_one ();
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}
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thread_decoder.join ().unwrap ()?;
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tracing::debug! ("Joining PCM thread...");
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let (lock, cvar) = &*pcm_quit2;
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let _ = cvar.wait (lock.lock ().unwrap ()).unwrap ();
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drop (stream);
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sleep (Duration::from_secs (1));
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tracing::info! ("Exiting cleanly.");
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Ok (())
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}
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#[cfg (test)]
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mod test {
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use super::*;
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#[test]
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fn decode () -> Result <()> {
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ffmpeg_next::init ()?;
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let mut input_ctx = ffmpeg_next::format::input (&"test.opus")?;
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let stream = input_ctx
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.streams ()
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.best (ffmpeg_next::media::Type::Audio)
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.ok_or_else (|| anyhow! ("can't find good audio stream"))?;
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let best_stream_idx = stream.index ();
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let mut decoder = stream.codec ().decoder ().audio ()?;
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let mut packet_count = 0;
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let mut frame_count = 0;
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let mut frame = ffmpeg_next::util::frame::Audio::empty ();
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let mut packets = input_ctx.packets ();
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loop {
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let mut did_anything = false;
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while decoder.receive_frame (&mut frame).is_ok () {
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frame_count += 1;
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did_anything = true;
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}
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match packets.next () {
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None => {},
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Some ((stream, packet)) => {
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did_anything = true;
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if stream.index () == best_stream_idx {
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packet_count += 1;
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decoder.send_packet (&packet)?;
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}
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},
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}
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if ! did_anything {
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break;
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}
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}
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assert_eq! (packet_count, 5496);
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assert_eq! (frame_count, 5496);
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Ok (())
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}
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}
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