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// Copyright (C) 2019 Guillaume Desmottes <guillaume.desmottes@collabora.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 glib::subclass::prelude::*;
use gst::gst_debug;
use gst::subclass::prelude::*;
use gst_video::prelude::VideoDecoderExtManual;
use gst_video::prelude::*;
use gst_video::subclass::prelude::*;
use image::GenericImageView;
use once_cell::sync::Lazy;
use std::sync::Mutex;
use crate::constants::{CDG_HEIGHT, CDG_WIDTH};
static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
gst::DebugCategory::new("cdgdec", gst::DebugColorFlags::empty(), Some("CDG decoder"))
});
#[derive(Default)]
pub struct CdgDec {
cdg_inter: Mutex<Box<cdg_renderer::CdgInterpreter>>,
output_info: Mutex<Option<gst_video::VideoInfo>>,
}
#[glib::object_subclass]
impl ObjectSubclass for CdgDec {
const NAME: &'static str = "CdgDec";
type Type = super::CdgDec;
type ParentType = gst_video::VideoDecoder;
}
impl ObjectImpl for CdgDec {}
impl ElementImpl for CdgDec {
fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
gst::subclass::ElementMetadata::new(
"CDG decoder",
"Decoder/Video",
"CDG decoder",
"Guillaume Desmottes <guillaume.desmottes@collabora.com>",
)
});
Some(&*ELEMENT_METADATA)
}
fn pad_templates() -> &'static [gst::PadTemplate] {
static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
let sink_caps = gst::Caps::new_simple("video/x-cdg", &[("parsed", &true)]);
let sink_pad_template = gst::PadTemplate::new(
"sink",
gst::PadDirection::Sink,
gst::PadPresence::Always,
&sink_caps,
)
.unwrap();
let src_caps = gst::Caps::new_simple(
"video/x-raw",
&[
("format", &gst_video::VideoFormat::Rgba.to_str()),
("width", &(CDG_WIDTH as i32)),
("height", &(CDG_HEIGHT as i32)),
("framerate", &gst::Fraction::new(0, 1)),
],
);
let src_pad_template = gst::PadTemplate::new(
"src",
gst::PadDirection::Src,
gst::PadPresence::Always,
&src_caps,
)
.unwrap();
vec![src_pad_template, sink_pad_template]
});
PAD_TEMPLATES.as_ref()
}
}
impl VideoDecoderImpl for CdgDec {
fn start(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
let mut out_info = self.output_info.lock().unwrap();
*out_info = None;
self.parent_start(element)
}
fn stop(&self, element: &Self::Type) -> Result<(), gst::ErrorMessage> {
{
let mut cdg_inter = self.cdg_inter.lock().unwrap();
cdg_inter.reset(true);
}
self.parent_stop(element)
}
fn handle_frame(
&self,
element: &Self::Type,
mut frame: gst_video::VideoCodecFrame,
) -> Result<gst::FlowSuccess, gst::FlowError> {
{
let mut out_info = self.output_info.lock().unwrap();
if out_info.is_none() {
let output_state = element.set_output_state(
gst_video::VideoFormat::Rgba,
CDG_WIDTH,
CDG_HEIGHT,
None,
)?;
element.negotiate(output_state)?;
let out_state = element.get_output_state().unwrap();
*out_info = Some(out_state.get_info());
}
}
let cmd = {
let input = frame.get_input_buffer().unwrap();
let map = input.map_readable().map_err(|_| {
gst::element_error!(
element,
gst::CoreError::Failed,
["Failed to map input buffer readable"]
);
gst::FlowError::Error
})?;
let data = map.as_slice();
cdg::decode_subchannel_cmd(&data)
};
let cmd = match cmd {
Some(cmd) => cmd,
None => {
// Not a CDG command
element.release_frame(frame);
return Ok(gst::FlowSuccess::Ok);
}
};
let mut cdg_inter = self.cdg_inter.lock().unwrap();
cdg_inter.handle_cmd(cmd);
element.allocate_output_frame(&mut frame, None)?;
{
let output = frame.get_output_buffer_mut().unwrap();
let info = self.output_info.lock().unwrap();
let mut out_frame =
gst_video::VideoFrameRef::from_buffer_ref_writable(output, info.as_ref().unwrap())
.map_err(|_| {
gst::element_error!(
element,
gst::CoreError::Failed,
["Failed to map output buffer writable"]
);
gst::FlowError::Error
})?;
let out_stride = out_frame.plane_stride()[0] as usize;
for (y, line) in out_frame
.plane_data_mut(0)
.unwrap()
.chunks_exact_mut(out_stride)
.take(CDG_HEIGHT as usize)
.enumerate()
{
for (x, pixel) in line
.chunks_exact_mut(4)
.take(CDG_WIDTH as usize)
.enumerate()
{
let p = cdg_inter.get_pixel(x as u32, y as u32);
pixel.copy_from_slice(&p.0);
}
}
}
gst_debug!(CAT, obj: element, "Finish frame pts={}", frame.get_pts());
element.finish_frame(frame)
}
fn decide_allocation(
&self,
element: &Self::Type,
query: &mut gst::QueryRef,
) -> Result<(), gst::ErrorMessage> {
if let gst::query::QueryView::Allocation(allocation) = query.view() {
if allocation
.find_allocation_meta::<gst_video::VideoMeta>()
.is_some()
{
let pools = allocation.get_allocation_pools();
if let Some((Some(ref pool), _, _, _)) = pools.first() {
let mut config = pool.get_config();
config.add_option(&gst_video::BUFFER_POOL_OPTION_VIDEO_META);
pool.set_config(config)
.map_err(|e| gst::error_msg!(gst::CoreError::Negotiation, [&e.message]))?;
}
}
}
self.parent_decide_allocation(element, query)
}
fn flush(&self, element: &Self::Type) -> bool {
gst_debug!(CAT, obj: element, "flushing, reset CDG interpreter");
let mut cdg_inter = self.cdg_inter.lock().unwrap();
cdg_inter.reset(false);
true
}
}
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