From 15980d347cd780a4cac5bb8571c80c8ff90363f8 Mon Sep 17 00:00:00 2001
From: _ <_@_>
Date: Fri, 12 Nov 2021 12:14:15 -0600
Subject: [PATCH] :hatching_chick:

---
 .gitignore  |   2 +
 Cargo.lock  | 909 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  11 +
 src/main.rs | 192 +++++++++++
 4 files changed, 1114 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fa4a306
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..5df42f3
--- /dev/null
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..99d484b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "music_player"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.45"
+cpal = "0.13.4"
+ffmpeg-next = "4.4.0"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b0eff56
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,192 @@
+use std::{
+	sync::{
+		Arc,
+		Condvar,
+		Mutex,
+	},
+	thread,
+};
+
+use anyhow::{
+	anyhow,
+	//bail,
+	Result,
+};
+
+use cpal::traits::{
+	DeviceTrait,
+	HostTrait,
+	StreamTrait,
+};
+
+const SAMPLE_RATE: u32 = 48000;
+
+#[derive (Default)]
+struct PcmBuffers {
+	buffers: Vec <Vec <f32>>,
+	
+	// Always points into the first buffer, if any
+	consumer_cursor: usize,
+}
+
+impl PcmBuffers {
+	fn samples_available (&self) -> usize {
+		self.buffers.iter ().map (|b| b.len ()).sum::<usize> () - self.consumer_cursor
+	}
+	
+	#[warn(unused_must_use)]
+	fn consume_exact (&mut self, data: &mut [f32]) -> bool {
+		if data.len () > self.samples_available () {
+			return false;
+		}
+		
+		for x in data {
+			if self.consumer_cursor >= self.buffers [0].len () {
+				self.buffers.remove (0);
+				self.consumer_cursor = 0;
+			}
+			
+			*x = self.buffers [0][self.consumer_cursor];
+			self.consumer_cursor += 1;
+		}
+		
+		true
+	}
+	
+	fn produce (&mut self, new_buffer: Vec <f32>) {
+		self.buffers.push (new_buffer);
+	}
+}
+
+fn main () -> Result <()> {
+	let host = cpal::default_host ();
+	let device = host.default_output_device ().ok_or_else (|| anyhow! ("can't open cpal device"))?;
+	
+	let mut supported_configs_range = device.supported_output_configs ()?
+	.filter (|c| c.channels () == 2 && c.sample_format () == cpal::SampleFormat::F32);
+	
+	let config = supported_configs_range.next ()
+	.ok_or_else (|| anyhow! ("can't get stereo f32 audio output"))?
+	.with_sample_rate (cpal::SampleRate (SAMPLE_RATE))
+	.config ();
+	
+	let pair = Arc::new ((Mutex::new (PcmBuffers::default ()), Condvar::new ()));
+	let pair2 = Arc::clone (&pair);
+	
+	let thread_decoder = thread::spawn (move|| {
+		let (lock, cvar) = &*pair2;
+		
+		let freq = 75;
+		let period = SAMPLE_RATE / freq;
+		
+		let mut saw_counter = 0;
+		
+		loop {
+			let mut buffer = vec! [0.0f32; 4000];
+			
+			for x in &mut buffer {
+				*x = 0.25 * (saw_counter as f32 * 2.0 / period as f32 - 1.0);
+				
+				saw_counter += 1;
+				if saw_counter >= period {
+					saw_counter = 0
+				}
+			}
+			
+			// eprintln! ("decode thread parking");
+			
+			let mut pcm_buffers = cvar.wait_while (lock.lock ().unwrap (), |pcm_buffers| {
+				// eprintln! ("checking cvar...");
+				pcm_buffers.samples_available () >= 48_000
+			}).unwrap ();
+			
+			// dbg! (pcm_buffers.samples_available ());
+			pcm_buffers.produce (buffer);
+		}
+		
+		Ok::<_, anyhow::Error> (())
+	});
+	
+	let stream = device.build_output_stream (
+		&config,
+		move |data: &mut [f32], _: &cpal::OutputCallbackInfo| {
+			let (lock, cvar) = &*pair;
+			
+			let mut pcm_buffers = match lock.lock () {
+				Ok (x) => x,
+				Err (_) => return,
+			};
+			
+			if ! pcm_buffers.consume_exact (data) {
+				eprintln! ("PCM buffer underflow");
+			}
+			
+			if pcm_buffers.samples_available () < 24_000 {
+				cvar.notify_one ();
+			}
+		},
+		move |err| {
+			// react to errors here.
+		},
+	);
+	
+	std::thread::sleep (std::time::Duration::from_millis (1_000));
+	
+	thread_decoder.join ().unwrap ()?;
+	
+	Ok (())
+}
+
+#[cfg (test)]
+mod test {
+	use super::*;
+	
+	#[test]
+	fn decode () -> Result <()> {
+		ffmpeg_next::init ()?;
+		
+		let mut input_ctx = ffmpeg_next::format::input (&"test.opus")?;
+		let stream = input_ctx
+		.streams ()
+		.best (ffmpeg_next::media::Type::Audio)
+		.ok_or_else (|| anyhow! ("can't find good audio stream"))?;
+		let best_stream_idx = stream.index ();
+		
+		let mut decoder = stream.codec ().decoder ().audio ()?;
+		
+		let mut packet_count = 0;
+		let mut frame_count = 0;
+		let mut frame = ffmpeg_next::util::frame::Audio::empty ();
+		
+		let mut packets = input_ctx.packets ();
+		
+		loop {
+			let mut did_anything = false;
+			
+			while decoder.receive_frame (&mut frame).is_ok () {
+				frame_count += 1;
+				did_anything = true;
+			}
+			
+			match packets.next () {
+				None => {},
+				Some ((stream, packet)) => {
+					did_anything = true;
+					if stream.index () == best_stream_idx {
+						packet_count += 1;
+						decoder.send_packet (&packet)?;
+					}
+				},
+			}
+			
+			if ! did_anything {
+				break;
+			}
+		}
+		
+		assert_eq! (packet_count, 5496);
+		assert_eq! (frame_count, 5496);
+		
+		Ok (())
+	}
+}