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// Copyright (C) 2020 Philippe Normand <philn@igalia.com>
// Copyright (C) 2020 Natanael Mojica <neithanmo@gmail.com>
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use gst::glib;
use gst::prelude::*;
use gst::subclass::prelude::*;
use gst::{gst_debug, gst_error};
use gst_base::subclass::base_transform::BaseTransformImplExt;
use gst_base::subclass::base_transform::GenerateOutputSuccess;
use gst_base::subclass::prelude::*;
use nnnoiseless::DenoiseState;
use byte_slice_cast::*;
use once_cell::sync::Lazy;
use atomic_refcell::AtomicRefCell;
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new(
"audiornnoise",
gst::DebugColorFlags::empty(),
Some("Rust Audio Denoise Filter"),
)
});
const FRAME_SIZE: usize = DenoiseState::FRAME_SIZE;
struct ChannelDenoiser {
denoiser: Box<DenoiseState<'static>>,
frame_chunk: Box<[f32; FRAME_SIZE]>,
out_chunk: Box<[f32; FRAME_SIZE]>,
}
struct State {
in_info: gst_audio::AudioInfo,
denoisers: Vec<ChannelDenoiser>,
adapter: gst_base::UniqueAdapter,
}
#[derive(Default)]
pub struct AudioRNNoise {
state: AtomicRefCell<Option<State>>,
}
impl State {
// The following three functions are copied from the csound filter.
fn buffer_duration(&self, buffer_size: u64) -> Option<gst::ClockTime> {
let samples = buffer_size / self.in_info.bpf() as u64;
self.samples_to_time(samples)
}
fn samples_to_time(&self, samples: u64) -> Option<gst::ClockTime> {
samples
.mul_div_round(*gst::ClockTime::SECOND, self.in_info.rate() as u64)
.map(gst::ClockTime::from_nseconds)
}
fn current_pts(&self) -> Option<gst::ClockTime> {
// get the last seen pts and the amount of bytes
// since then
let (prev_pts, distance) = self.adapter.prev_pts();
// Use the distance to get the amount of samples
// and with it calculate the time-offset which
// can be added to the prev_pts to get the
// pts at the beginning of the adapter.
let samples = distance / self.in_info.bpf() as u64;
prev_pts
.opt_checked_add(self.samples_to_time(samples))
.ok()
.flatten()
}
fn needs_more_data(&self) -> bool {
self.adapter.available() < (FRAME_SIZE * self.in_info.bpf() as usize)
}
fn process(&mut self, input_plane: &[f32], output_plane: &mut [f32]) {
let channels = self.in_info.channels() as usize;
let size = FRAME_SIZE * channels;
for (out_frame, in_frame) in output_plane.chunks_mut(size).zip(input_plane.chunks(size)) {
for (index, item) in in_frame.iter().enumerate() {
let channel_index = index % channels;
let channel_denoiser = &mut self.denoisers[channel_index];
let pos = index / channels;
channel_denoiser.frame_chunk[pos] = *item;
}
for i in (in_frame.len() / channels)..(size / channels) {
for c in 0..channels {
let channel_denoiser = &mut self.denoisers[c];
channel_denoiser.frame_chunk[i] = 0.0;
}
}
// FIXME: The first chunks coming out of the denoisers contains some
// fade-in artifacts. We might want to discard those.
for channel_denoiser in &mut self.denoisers {
channel_denoiser.denoiser.process_frame(
&mut channel_denoiser.out_chunk[..],
&channel_denoiser.frame_chunk[..],
);
}
for (index, item) in out_frame.iter_mut().enumerate() {
let channel_index = index % channels;
let channel_denoiser = &self.denoisers[channel_index];
let pos = index / channels;
*item = channel_denoiser.out_chunk[pos];
}
}
}
}
impl AudioRNNoise {
fn drain(&self, element: &super::AudioRNNoise) -> Result<gst::FlowSuccess, gst::FlowError> {
let mut state_lock = self.state.borrow_mut();
let state = state_lock.as_mut().unwrap();
let available = state.adapter.available();
if available == 0 {
return Ok(gst::FlowSuccess::Ok);
}
let mut buffer = gst::Buffer::with_size(available).map_err(|e| {
gst_error!(
CAT,
obj: element,
"Failed to allocate buffer at EOS {:?}",
e
);
gst::FlowError::Flushing
})?;
let duration = state.buffer_duration(available as _);
let pts = state.current_pts();
{
let ibuffer = state.adapter.take_buffer(available).unwrap();
let in_map = ibuffer.map_readable().map_err(|_| gst::FlowError::Error)?;
let in_data = in_map.as_slice_of::<f32>().unwrap();
let buffer = buffer.get_mut().unwrap();
buffer.set_duration(duration);
buffer.set_pts(pts);
let mut out_map = buffer.map_writable().map_err(|_| gst::FlowError::Error)?;
let mut out_data = out_map.as_mut_slice_of::<f32>().unwrap();
state.process(in_data, &mut out_data);
}
let srcpad = element.static_pad("src").unwrap();
srcpad.push(buffer)
}
fn generate_output(
&self,
_element: &super::AudioRNNoise,
state: &mut State,
) -> Result<GenerateOutputSuccess, gst::FlowError> {
let available = state.adapter.available();
let bpf = state.in_info.bpf() as usize;
let output_size = available - (available % (FRAME_SIZE * bpf));
let duration = state.buffer_duration(output_size as _);
let pts = state.current_pts();
let mut buffer = gst::Buffer::with_size(output_size).map_err(|_| gst::FlowError::Error)?;
{
let ibuffer = state
.adapter
.take_buffer(output_size)
.map_err(|_| gst::FlowError::Error)?;
let in_map = ibuffer.map_readable().map_err(|_| gst::FlowError::Error)?;
let in_data = in_map.as_slice_of::<f32>().unwrap();
let buffer = buffer.get_mut().unwrap();
buffer.set_duration(duration);
buffer.set_pts(pts);
let mut out_map = buffer.map_writable().map_err(|_| gst::FlowError::Error)?;
let mut out_data = out_map.as_mut_slice_of::<f32>().unwrap();
state.process(in_data, &mut out_data);
}
Ok(GenerateOutputSuccess::Buffer(buffer))
}
}
#[glib::object_subclass]
impl ObjectSubclass for AudioRNNoise {
const NAME: &'static str = "AudioRNNoise";
type Type = super::AudioRNNoise;
type ParentType = gst_base::BaseTransform;
}
impl ObjectImpl for AudioRNNoise {}
impl ElementImpl for AudioRNNoise {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"Audio denoise",
"Filter/Effect/Audio",
"Removes noise from an audio stream",
"Philippe Normand <philn@igalia.com>",
)
});
Some(&*ELEMENT_METADATA)
}
fn pad_templates() -> &'static [gst::PadTemplate] {
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
let caps = gst::Caps::new_simple(
"audio/x-raw",
&[
("format", &gst_audio::AUDIO_FORMAT_F32.to_str()),
("rate", &48000),
("channels", &gst::IntRange::<i32>::new(1, std::i32::MAX)),
("layout", &"interleaved"),
],
);
let src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&caps,
)
.unwrap();
let sink_pad_template = gst::PadTemplate::new(
"sink",
gst::PadDirection::Sink,
gst::PadPresence::Always,
&caps,
)
.unwrap();
vec![src_pad_template, sink_pad_template]
});
PAD_TEMPLATES.as_ref()
}
}
impl BaseTransformImpl for AudioRNNoise {
const MODE: gst_base::subclass::BaseTransformMode =
gst_base::subclass::BaseTransformMode::NeverInPlace;
const PASSTHROUGH_ON_SAME_CAPS: bool = false;
const TRANSFORM_IP_ON_PASSTHROUGH: bool = false;
fn set_caps(
&self,
element: &Self::Type,
incaps: &gst::Caps,
outcaps: &gst::Caps,
) -> Result<(), gst::LoggableError> {
// Flush previous state
if self.state.borrow_mut().is_some() {
self.drain(element).map_err(|e| {
gst::loggable_error!(CAT, "Error flusing previous state data {:?}", e)
})?;
}
if incaps != outcaps {
return Err(gst::loggable_error!(
CAT,
"Input and output caps are not the same"
));
}
gst_debug!(CAT, obj: element, "Set caps to {}", incaps);
let in_info = gst_audio::AudioInfo::from_caps(incaps)
.map_err(|e| gst::loggable_error!(CAT, "Failed to parse input caps {:?}", e))?;
let mut denoisers = vec![];
for _i in 0..in_info.channels() {
denoisers.push(ChannelDenoiser {
denoiser: DenoiseState::new(),
frame_chunk: Box::new([0.0; FRAME_SIZE]),
out_chunk: Box::new([0.0; FRAME_SIZE]),
})
}
let mut state_lock = self.state.borrow_mut();
*state_lock = Some(State {
in_info,
denoisers,
adapter: gst_base::UniqueAdapter::new(),
});
Ok(())
}
fn generate_output(
&self,
element: &Self::Type,
) -> Result<GenerateOutputSuccess, gst::FlowError> {
// Check if there are enough data in the queued buffer and adapter,
// if it is not the case, just notify the parent class to not generate
// an output
if let Some(buffer) = self.take_queued_buffer() {
if buffer.flags() == gst::BufferFlags::DISCONT {
self.drain(element)?;
}
let mut state_guard = self.state.borrow_mut();
let state = state_guard.as_mut().ok_or_else(|| {
gst::element_error!(
element,
gst::CoreError::Negotiation,
["Can not generate an output without State"]
);
gst::FlowError::NotNegotiated
})?;
state.adapter.push(buffer);
if !state.needs_more_data() {
return self.generate_output(element, state);
}
}
Ok(GenerateOutputSuccess::NoOutput)
}
fn sink_event(&self, element: &Self::Type, event: gst::Event) -> bool {
use gst::EventView;
if let EventView::Eos(_) = event.view() {
gst_debug!(CAT, obj: element, "Handling EOS");
if self.drain(element).is_err() {
return false;
}
}
self.parent_sink_event(element, event)
}
fn query(
&self,
element: &Self::Type,
direction: gst::PadDirection,
query: &mut gst::QueryRef,
) -> bool {
if direction == gst::PadDirection::Src {
if let gst::QueryView::Latency(ref mut q) = query.view_mut() {
let sink_pad = element.static_pad("sink").expect("Sink pad not found");
let mut upstream_query = gst::query::Latency::new();
if sink_pad.peer_query(&mut upstream_query) {
let (live, mut min, mut max) = upstream_query.result();
gst_debug!(
CAT,
obj: element,
"Peer latency: live {} min {} max {}",
live,
min,
max.display(),
);
min += gst::ClockTime::from_seconds((FRAME_SIZE / 48000) as u64);
max = max.opt_add(gst::ClockTime::from_seconds((FRAME_SIZE / 48000) as u64));
q.set(live, min, max);
return true;
}
}
}
BaseTransformImplExt::parent_query(self, element, direction, query)
}
fn stop(&self, _element: &Self::Type) -> Result<(), gst::ErrorMessage> {
// Drop state
let _ = self.state.borrow_mut().take();
Ok(())
}
}
|