From 2d7ef8336d8976703402ddb8ef5ccec20a7f99ec Mon Sep 17 00:00:00 2001
From: Tad Hardesty <tad@platymuus.com>
Date: Wed, 24 Feb 2016 00:50:13 -0600
Subject: [PATCH] Initial commit

---
 .gitignore |   2 ++
 Cargo.toml |   8 +++++
 src/lib.rs | 102 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 112 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..a9d37c5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+target
+Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..605c963
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+authors = ["Tad Hardesty <tad@platymuus.com>"]
+name = "opus"
+version = "0.1.0"
+
+[dependencies]
+opus-sys = "0.1.2"
+libc = "0.1"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..47d2d87
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,102 @@
+extern crate opus_sys as ffi;
+extern crate libc;
+
+use libc::{c_int};
+
+// Generic CTLs
+const OPUS_RESET_STATE: c_int = 4028; // void
+const OPUS_GET_FINAL_RANGE: c_int = 4031; // *uint
+const OPUS_GET_BANDWIDTH: c_int = 4009; // *int
+const OPUS_GET_SAMPLE_RATE: c_int = 4029; // *int
+
+pub enum CodingMode {
+	Voip = 2048,
+	Audio = 2049,
+	LowDelay = 2051,
+}
+
+pub enum Channels {
+	Mono = 1,
+	Stereo = 2,
+}
+
+pub struct Error(&'static str, c_int);
+
+fn check(what: &'static str, code: c_int) -> Result<()> {
+	if code < 0 {
+		Err(Error(what, code))
+	} else {
+		Ok(())
+	}
+}
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+pub struct Encoder {
+	ptr: *mut ffi::OpusEncoder,
+}
+
+impl Encoder {
+	pub fn new(sample_rate: u32, channels: Channels, mode: CodingMode) -> Result<Encoder> {
+		let mut error = 0;
+		let ptr = unsafe { ffi::opus_encoder_create(
+			sample_rate as i32,
+			channels as c_int,
+			mode as c_int,
+			&mut error) };
+		if error != ffi::OPUS_OK || ptr.is_null() {
+			Err(Error("opus_encoder_create", error))
+		} else {
+			Ok(Encoder { ptr: ptr })
+		}
+	}
+
+	pub fn encode(&mut self, input: &[i16], output: &mut [u8]) -> Result<usize> {
+		let len = unsafe { ffi::opus_encode(self.ptr,
+			input.as_ptr(), input.len() as c_int,
+			output.as_mut_ptr(), output.len() as c_int) };
+		try!(check("opus_encode", len));
+		Ok(len as usize)
+	}
+
+	pub fn encode_float(&mut self, input: &[f32], output: &mut [u8]) -> Result<usize> {
+		let len = unsafe { ffi::opus_encode_float(self.ptr,
+			input.as_ptr(), input.len() as c_int,
+			output.as_mut_ptr(), output.len() as c_int) };
+		try!(check("opus_encode_float", len));
+		Ok(len as usize)
+	}
+
+	pub fn reset_state(&mut self) -> Result<()> {
+		check("opus_encoder_ctl(OPUS_RESET_STATE)", unsafe { ffi::opus_encoder_ctl(self.ptr, OPUS_RESET_STATE) })
+	}
+
+	pub fn get_final_range(&mut self) -> Result<u32> {
+		let mut value = 0;
+		let result = unsafe { ffi::opus_encoder_ctl(self.ptr, OPUS_GET_FINAL_RANGE, &mut value) };
+		try!(check("opus_encoder_ctl(OPUS_GET_FINAL_RANGE)", result));
+		Ok(value)
+	}
+
+	pub fn get_bandwidth(&mut self) -> Result<i32> {
+		let mut value = 0;
+		let result = unsafe { ffi::opus_encoder_ctl(self.ptr, OPUS_GET_BANDWIDTH, &mut value) };
+		try!(check("opus_encoder_ctl(OPUS_GET_BANDWIDTH)", result));
+		Ok(value)
+	}
+
+	pub fn get_sample_rate(&mut self) -> Result<i32> {
+		let mut value = 0;
+		let result = unsafe { ffi::opus_encoder_ctl(self.ptr, OPUS_GET_SAMPLE_RATE, &mut value) };
+		try!(check("opus_encoder_ctl(OPUS_GET_SAMPLE_RATE)", result));
+		Ok(value)
+	}
+
+	// TODO: Many more CTLs
+}
+
+impl Drop for Encoder {
+	fn drop(&mut self) {
+		unsafe { ffi::opus_encoder_destroy(self.ptr) }
+	}
+}