commit 3d92f3192b8f0bda77010585df58dafcf759ecef
Author: Manuel Vögele <develop@manuel-voegele.de>
Date:   Wed Jul 28 11:11:04 2021 +0200

    Initial commit

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+name = "winreg"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0120db82e8a1e0b9fb3345a539c478767c0048d842860994d96113d5b667bd69"
+dependencies = [
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "ws2_32-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+dependencies = [
+ "winapi 0.2.8",
+ "winapi-build",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..334ea3d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "amplifier-bot"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+log = "*"
+ogg-opus = "*"
+pretty_env_logger = "*"
+reqwest = {version="*", features=["blocking"]}
+serde = "*"
+serde_json = "*"
+telegram-bot = "*"
+thiserror = "*"
+tokio = {version="^0.2", features=["macros"]}
+tokio-stream = "*"
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..218e203
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+hard_tabs = true
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..bbe5c48
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,157 @@
+use std::io::Cursor;
+use std::{fs::File, io::BufReader};
+
+use log::*;
+use serde::{Deserialize, Serialize};
+use telegram_bot::CanReplySendMessage;
+use telegram_bot::{
+	Api, CanGetFile, CanReplySendAudio, InputFileUpload, MessageKind, UpdateKind, Voice,
+};
+use thiserror::Error;
+use tokio_stream::StreamExt;
+
+#[derive(Serialize, Deserialize, Debug)]
+struct Config {
+	token: String,
+}
+
+#[derive(Error, Debug)]
+enum UnresolvableError {
+	#[error(transparent)]
+	ConfigLoadError(ConfigLoadError),
+	#[error(transparent)]
+	ApiError(#[from] telegram_bot::Error),
+}
+
+#[derive(Error, Debug)]
+enum ConfigLoadError {
+	#[error("Failed to open config file: {0}")]
+	OpenFailed(#[source] std::io::Error),
+	#[error("Failed to read config file: {0}")]
+	ReadError(#[source] serde_json::Error),
+}
+
+#[derive(Error, Debug)]
+enum RuntimeError {
+	#[error("Couldn't get file information")]
+	FileInfoRequestFailed(#[source] telegram_bot::Error),
+	#[error("File has no URL")]
+	FileNoUrl,
+	#[error("Cannot download file")]
+	FileDownloadFailed(#[source] reqwest::Error),
+	#[error("Cannot decode audio file")]
+	FileDecodeError(#[source] ogg_opus::Error),
+	#[error("Cannot encode audio file")]
+	FileEncodeError(#[source] ogg_opus::Error),
+	#[error("Internal error")]
+	IOError(#[from] std::io::Error),
+}
+
+impl Config {
+	fn load() -> Result<Self, ConfigLoadError> {
+		let file = File::open("config.json").map_err(ConfigLoadError::OpenFailed)?;
+		let reader = BufReader::new(file);
+		serde_json::from_reader(reader).map_err(ConfigLoadError::ReadError)
+	}
+}
+
+#[tokio::main]
+async fn main() -> Result<(), UnresolvableError> {
+	pretty_env_logger::init();
+	info!("Starting amplifier-bot");
+
+	info!("Reading configuration");
+	let config = Config::load().map_err(UnresolvableError::ConfigLoadError)?;
+
+	info!("Long-polling for updates...");
+	let api = Api::new(&config.token);
+	let mut stream = api.stream();
+	while let Some(update) = stream.next().await {
+		// If the received update contains a new message...
+		let update = update?;
+		if let UpdateKind::Message(message) = update.kind {
+			if let MessageKind::Voice { data } = &message.kind {
+				let result = handle_voice_message(&config, &api, data).await;
+				match result {
+					Ok(audio) => {
+						api.send(
+							message.audio_reply(InputFileUpload::with_data(audio, "amplified.ogg")),
+						)
+						.await?;
+					}
+					Err(err) => {
+						error!("{:?}", err);
+						api.send(message.text_reply(format!("Error: {}", err)))
+							.await?;
+					}
+				}
+			}
+		}
+	}
+
+	Ok(())
+}
+
+async fn handle_voice_message(
+	config: &Config,
+	api: &Api,
+	data: &Voice,
+) -> Result<Vec<u8>, RuntimeError> {
+	info!("Amplifying voice message with duration {}s", data.duration);
+
+	let file_info = api
+		.send(data.get_file())
+		.await
+		.map_err(RuntimeError::FileInfoRequestFailed)?;
+
+	let url = file_info
+		.get_url(&config.token)
+		.ok_or(RuntimeError::FileNoUrl)?;
+
+	let ogg_data_in = reqwest::blocking::get(url)
+		.and_then(|response| response.bytes())
+		.map_err(RuntimeError::FileDownloadFailed)?;
+
+	let (audio, play_data) = ogg_opus::decode::<_, 48000>(Cursor::new(ogg_data_in))
+		.map_err(RuntimeError::FileDecodeError)?;
+
+	if play_data.channels != 1 {
+		warn!(
+			"Encountered unexpected voice file with {} channels",
+			play_data.channels
+		);
+	}
+
+	let mut last_audio = audio.clone();
+	let mut amplification_factor = 2;
+	loop {
+		let (current_audio, clipping_rate) = amplify_audio(&audio, amplification_factor);
+		if clipping_rate > 1.0 / (48000.0 * 10.0) {
+			break;
+		}
+		last_audio = current_audio;
+		amplification_factor += 1;
+	}
+
+	debug!("Amplified with factor {}", amplification_factor - 1);
+
+	let ogg_data_out =
+		ogg_opus::encode::<48000, 1>(&last_audio).map_err(RuntimeError::FileEncodeError)?;
+
+	Ok(ogg_data_out)
+}
+
+fn amplify_audio(original: &[i16], factor: i16) -> (Vec<i16>, f64) {
+	let mut modified_audio = original.to_owned();
+	let mut clipping_samples = 0;
+	for sample in modified_audio.iter_mut() {
+		*sample = sample.checked_mul(factor).unwrap_or_else(|| {
+			clipping_samples += 1;
+			sample.saturating_mul(factor)
+		});
+	}
+
+	let clipping_rate = clipping_samples as f64 / modified_audio.len() as f64;
+	info!("samples: {}    rate: {}", clipping_samples, clipping_rate);
+	(modified_audio, clipping_rate)
+}