rustdesk/magnum-opus
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Tad Hardesty
2016-02-25 04:49:42 -06:00
parent 4d93aaad66
commit 1df6208ba8
1 changed files with 103 additions and 8 deletions
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111
src/lib.rs
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@@ -1,3 +1,9 @@
//! High-level bindings for libopus.
//!
//! Only brief descriptions are included here. For detailed information, consult
//! the [libopus documentation](https://opus-codec.org/docs/opus_api-1.1.2/).
#![warn(missing_docs)]
extern crate opus_sys as ffi;
extern crate libc;
@@ -5,8 +11,6 @@ use std::ffi::CStr;
use libc::{c_int};
// TODO: Documentation
// ============================================================================
// Constants
@@ -16,40 +20,79 @@ 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
/// The possible coding modes for the codec.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub enum CodingMode {
/// Best for most VoIP/videoconference applications where listening quality and intelligibility matter most.
Voip = 2048,
/// Best for broadcast/high-fidelity application where the decoded audio should be as close as possible to the input.
Audio = 2049,
/// Only use when lowest-achievable latency is what matters most.
LowDelay = 2051,
}
/// The available channel setings.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub enum Channels {
Stereo = 1,
/// One channel.
Mono = 2,
/// Two channels, left and right.
Stereo = 1,
}
/// The available bandwidth level settings.
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
pub enum Bandwidth {
/// Auto/default setting.
Auto = -1000,
/// 4kHz bandpass.
Narrowband = 1101,
/// 6kHz bandpass.
Mediumband = 1102,
/// 8kHz bandpass.
Wideband = 1103,
/// 12kHz bandpass.
Superwideband = 1104,
/// 20kHz bandpass.
Fullband = 1105,
}
impl Bandwidth {
fn from_int(value: i32) -> Option<Bandwidth> {
Some(match value {
-1000 => Bandwidth::Auto,
1101 => Bandwidth::Narrowband,
1102 => Bandwidth::Mediumband,
1103 => Bandwidth::Wideband,
1104 => Bandwidth::Superwideband,
1105 => Bandwidth::Fullband,
_ => return None,
})
}
}
/// Possible error codes.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
pub enum ErrorCode {
/// One or more invalid/out of range arguments.
BadArg = -1,
/// Not enough bytes allocated in the buffer.
BufferTooSmall = -2,
/// An internal error was detected.
InternalError = -3,
/// The compressed data passed is corrupted.
InvalidPacket = -4,
/// Invalid/unsupported request number.
Unimplemented = -5,
/// An encoder or decoder structure is invalid or already freed.
InvalidState = -6,
/// Memory allocation has failed.
AllocFail = -7,
/// An unknown failure.
Unknown = -8,
}
/// Get the libopus version string.
pub fn version() -> &'static str {
// verison string should always be ASCII
unsafe { CStr::from_ptr(ffi::opus_get_version_string()) }.to_str().unwrap()
@@ -58,12 +101,14 @@ pub fn version() -> &'static str {
// ============================================================================
// Encoder
/// An Opus encoder with associated state.
pub struct Encoder {
ptr: *mut ffi::OpusEncoder,
channels: Channels,
}
impl Encoder {
/// Create and initialize an encoder.
pub fn new(sample_rate: u32, channels: Channels, mode: CodingMode) -> Result<Encoder> {
let mut error = 0;
let ptr = unsafe { ffi::opus_encoder_create(
@@ -78,6 +123,7 @@ impl Encoder {
}
}
/// Encode an Opus frame.
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 / self.channels as c_int,
@@ -86,6 +132,7 @@ impl Encoder {
Ok(len as usize)
}
/// Encode an Opus frame from floating point input.
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 / self.channels as c_int,
@@ -94,10 +141,12 @@ impl Encoder {
Ok(len as usize)
}
/// Reset the codec state to be equivalent to a freshly initialized state.
pub fn reset_state(&mut self) -> Result<()> {
check("opus_encoder_ctl(OPUS_RESET_STATE)", unsafe { ffi::opus_encoder_ctl(self.ptr, OPUS_RESET_STATE) })
}
/// Get the final range of the codec's entropy coder.
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) };
@@ -105,18 +154,20 @@ impl Encoder {
Ok(value)
}
pub fn get_bandwidth(&mut self) -> Result<i32> {
/// Get the encoder's configured bandpass.
pub fn get_bandwidth(&mut self) -> Result<Bandwidth> {
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)
Bandwidth::from_int(result).ok_or_else(|| Error::from_code("opus_encoder_ctl(OPUS_GET_BANDWIDTH)", ffi::OPUS_BAD_ARG))
}
pub fn get_sample_rate(&mut self) -> Result<i32> {
/// Get the samping rate the encoder was intialized with.
pub fn get_sample_rate(&mut self) -> Result<u32> {
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)
Ok(value as u32)
}
// TODO: Encoder-specific CTLs
@@ -131,12 +182,14 @@ impl Drop for Encoder {
// ============================================================================
// Decoder
/// An Opus decoder with associated state.
pub struct Decoder {
ptr: *mut ffi::OpusDecoder,
channels: Channels,
}
impl Decoder {
/// Create and initialize a decoder.
pub fn new(sample_rate: u32, channels: Channels) -> Result<Decoder> {
let mut error = 0;
let ptr = unsafe { ffi::opus_decoder_create(
@@ -150,7 +203,7 @@ impl Decoder {
}
}
// TODO: support null inputs ("packet loss")
/// Decode an Opus packet.
pub fn decode(&mut self, input: &[u8], output: &mut [i16], fec: bool) -> Result<usize> {
let len = unsafe { ffi::opus_decode(self.ptr,
input.as_ptr(), input.len() as c_int,
@@ -160,6 +213,7 @@ impl Decoder {
Ok(len as usize)
}
/// Decode an Opus packet with floating point output.
pub fn decode_float(&mut self, input: &[u8], output: &mut [f32], fec: bool) -> Result<usize> {
let len = unsafe { ffi::opus_decode_float(self.ptr,
input.as_ptr(), input.len() as c_int,
@@ -169,6 +223,7 @@ impl Decoder {
Ok(len as usize)
}
/// Get the number of samples of an Opus packet.
pub fn get_nb_samples(&self, packet: &[u8]) -> Result<usize> {
let len = unsafe { ffi::opus_decoder_get_nb_samples(self.ptr,
packet.as_ptr(), packet.len() as i32) };
@@ -189,12 +244,14 @@ impl Drop for Decoder {
// ============================================================================
// Packet Analysis
/// Analyze raw Opus packets.
pub mod packet {
use super::*;
use super::{ffi, check};
use std::{ptr, slice};
use libc::c_int;
/// Get the bandwidth of an Opus packet.
pub fn get_bandwidth(packet: &[u8]) -> Result<Bandwidth> {
if packet.len() < 1 {
return Err(Error::from_code("opus_packet_get_bandwidth", ffi::OPUS_BAD_ARG))
@@ -211,6 +268,7 @@ pub mod packet {
}
}
/// Get the number of channels from an Opus packet.
pub fn get_nb_channels(packet: &[u8]) -> Result<Channels> {
if packet.len() < 1 {
return Err(Error::from_code("opus_packet_get_nb_channels", ffi::OPUS_BAD_ARG))
@@ -224,12 +282,14 @@ pub mod packet {
}
}
/// Get the number of frames in an Opus packet.
pub fn get_nb_frames(packet: &[u8]) -> Result<usize> {
let frames = unsafe { ffi::opus_packet_get_nb_frames(packet.as_ptr(), packet.len() as c_int) };
try!(check("opus_packet_get_nb_frames", frames));
Ok(frames as usize)
}
/// Get the number of samples of an Opus packet.
pub fn get_nb_samples(packet: &[u8], sample_rate: u32) -> Result<usize> {
let frames = unsafe { ffi::opus_packet_get_nb_samples(
packet.as_ptr(), packet.len() as c_int,
@@ -238,6 +298,7 @@ pub mod packet {
Ok(frames as usize)
}
/// Get the number of samples per frame from an Opus packet.
pub fn get_samples_per_frame(packet: &[u8], sample_rate: u32) -> Result<usize> {
if packet.len() < 1 {
return Err(Error::from_code("opus_packet_get_samples_per_frame", ffi::OPUS_BAD_ARG))
@@ -247,6 +308,7 @@ pub mod packet {
Ok(samples as usize)
}
/// Parse an Opus packet into one or more frames.
pub fn parse(packet: &[u8]) -> Result<Packet> {
let mut toc: u8 = 0;
let mut frames = [ptr::null(); 48];
@@ -270,18 +332,28 @@ pub mod packet {
})
}
/// A parsed Opus packet, retuned from `parse`.
pub struct Packet<'a> {
/// The TOC byte of the packet.
pub toc: u8,
/// The frames contained in the packet.
pub frames: Vec<&'a [u8]>,
/// The offset into the packet at which the payload is located.
pub payload_offset: usize,
}
/// Pad a given Opus packet to a larger size.
///
/// The packet will be extended from the first `prev_len` bytes of the
/// buffer into the rest of the available space.
pub fn pad(packet: &mut [u8], prev_len: usize) -> Result<usize> {
let result = unsafe { ffi::opus_packet_pad(packet.as_mut_ptr(), prev_len as c_int, packet.len() as c_int) };
try!(check("opus_packet_pad", result));
Ok(result as usize)
}
/// Remove all padding from a given Opus packet and rewrite the TOC sequence
/// to minimize space usage.
pub fn unpad(packet: &mut [u8]) -> Result<usize> {
let result = unsafe { ffi::opus_packet_unpad(packet.as_mut_ptr(), packet.len() as c_int) };
try!(check("opus_packet_unpad", result));
@@ -292,16 +364,19 @@ pub mod packet {
// ============================================================================
// Float Soft Clipping
/// Soft-clipping to bring a float signal within the [-1,1] range.
pub struct SoftClip {
channels: Channels,
memory: [f32; 2],
}
impl SoftClip {
/// Initialize a new soft-clipping state.
pub fn new(channels: Channels) -> SoftClip {
SoftClip { channels: channels, memory: [0.0; 2] }
}
/// Apply soft-clipping to a float signal.
pub fn apply(&mut self, signal: &mut [f32]) {
unsafe { ffi::opus_pcm_soft_clip(
signal.as_mut_ptr(),
@@ -314,11 +389,15 @@ impl SoftClip {
// ============================================================================
// Repacketizer
// TODO: fix soundness hole by holding a borrow to the input packets
/// A repacketizer used to merge together or split apart multiple Opus packets.
pub struct Repacketizer {
ptr: *mut ffi::OpusRepacketizer,
}
impl Repacketizer {
/// Create and initialize a repacketizer.
pub fn new() -> Result<Repacketizer> {
let ptr = unsafe { ffi::opus_repacketizer_create() };
if ptr.is_null() {
@@ -328,20 +407,27 @@ impl Repacketizer {
}
}
/// Reset the repacketizer to its initial state.
pub fn reset(&mut self) {
unsafe { ffi::opus_repacketizer_init(self.ptr); }
}
/// Get the total number of frames contained in packet data submitted so
/// far via `cat` since the last call to `reset`.
pub fn get_nb_frames(&mut self) -> usize {
unsafe { ffi::opus_repacketizer_get_nb_frames(self.ptr) as usize }
}
/// Add a packet to the current repacketizer state.
pub fn cat(&mut self, packet: &[u8]) -> Result<()> {
let result = unsafe { ffi::opus_repacketizer_cat(self.ptr,
packet.as_ptr(), packet.len() as c_int) };
check("opus_repacketizer_cat", result)
}
/// Construct a new packet from data previously submitted via `cat`.
///
/// All previously submitted frames are used.
pub fn out(&mut self, buffer: &mut [u8]) -> Result<usize> {
let result = unsafe { ffi::opus_repacketizer_out(self.ptr,
buffer.as_mut_ptr(), buffer.len() as c_int) };
@@ -349,6 +435,10 @@ impl Repacketizer {
Ok(result as usize)
}
/// Construct a new packet from data previously submitted via `cat`, with
/// a manually specified subrange.
///
/// The `end` index should not exceed the value of `get_nb_frames()`.
pub fn out_range(&mut self, begin: usize, end: usize, buffer: &mut [u8]) -> Result<usize> {
let result = unsafe { ffi::opus_repacketizer_out_range(self.ptr,
begin as c_int, end as c_int,
@@ -370,8 +460,10 @@ impl Drop for Repacketizer {
// ============================================================================
// Error Handling
/// Opus error Result alias.
pub type Result<T> = std::result::Result<T, Error>;
/// An error generated by the Opus library.
#[derive(Debug)]
pub struct Error {
function: &'static str,
@@ -396,8 +488,11 @@ impl Error {
Error { function: what, description: description, code: code }
}
/// Get the name of the Opus function from which the error originated.
pub fn function(&self) -> &'static str { self.function }
/// Get a textual description of the error provided by Opus.
pub fn description(&self) -> &'static str { self.description }
/// Get the Opus error code of the error.
pub fn code(&self) -> ErrorCode { self.code }
}