mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-06-08 01:09:27 +00:00
380 lines
13 KiB
Rust
380 lines
13 KiB
Rust
//
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// Copyright (C) 2021 Bilal Elmoussaoui <bil.elmoussaoui@gmail.com>
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// Copyright (C) 2021 Jordan Petridis <jordan@centricular.com>
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// Copyright (C) 2021 Sebastian Dröge <sebastian@centricular.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
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// If a copy of the MPL was not distributed with this file, You can obtain one at
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// <https://mozilla.org/MPL/2.0/>.
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//
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// SPDX-License-Identifier: MPL-2.0
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use gst_video::prelude::*;
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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use gst_gl::prelude::*;
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use gtk::{gdk, glib};
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use std::collections::{HashMap, HashSet};
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#[derive(Debug)]
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enum MappedFrame {
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SysMem(gst_video::VideoFrame<gst_video::video_frame::Readable>),
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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GL {
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frame: gst_gl::GLVideoFrame<gst_gl::gl_video_frame::Readable>,
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wrapped_context: gst_gl::GLContext,
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},
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}
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impl MappedFrame {
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fn buffer(&self) -> &gst::BufferRef {
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match self {
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MappedFrame::SysMem(frame) => frame.buffer(),
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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MappedFrame::GL { frame, .. } => frame.buffer(),
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}
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}
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fn width(&self) -> u32 {
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match self {
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MappedFrame::SysMem(frame) => frame.width(),
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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MappedFrame::GL { frame, .. } => frame.width(),
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}
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}
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fn height(&self) -> u32 {
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match self {
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MappedFrame::SysMem(frame) => frame.height(),
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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MappedFrame::GL { frame, .. } => frame.height(),
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}
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}
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fn format_info(&self) -> gst_video::VideoFormatInfo {
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match self {
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MappedFrame::SysMem(frame) => frame.format_info(),
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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MappedFrame::GL { frame, .. } => frame.format_info(),
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}
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}
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}
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#[derive(Debug)]
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pub(crate) struct Frame {
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frame: MappedFrame,
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overlays: Vec<Overlay>,
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}
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#[derive(Debug)]
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struct Overlay {
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frame: gst_video::VideoFrame<gst_video::video_frame::Readable>,
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x: i32,
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y: i32,
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width: u32,
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height: u32,
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global_alpha: f32,
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}
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#[derive(Debug)]
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pub(crate) struct Texture {
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pub texture: gdk::Texture,
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pub x: f32,
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pub y: f32,
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pub width: f32,
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pub height: f32,
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pub global_alpha: f32,
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pub has_alpha: bool,
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}
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struct FrameWrapper(gst_video::VideoFrame<gst_video::video_frame::Readable>);
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impl AsRef<[u8]> for FrameWrapper {
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fn as_ref(&self) -> &[u8] {
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self.0.plane_data(0).unwrap()
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}
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}
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fn video_frame_to_memory_texture(
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frame: gst_video::VideoFrame<gst_video::video_frame::Readable>,
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cached_textures: &mut HashMap<usize, gdk::Texture>,
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used_textures: &mut HashSet<usize>,
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) -> (gdk::Texture, f64) {
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let texture_id = frame.plane_data(0).unwrap().as_ptr() as usize;
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let pixel_aspect_ratio =
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(frame.info().par().numer() as f64) / (frame.info().par().denom() as f64);
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if let Some(texture) = cached_textures.get(&texture_id) {
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used_textures.insert(texture_id);
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return (texture.clone(), pixel_aspect_ratio);
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}
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let format = match frame.format() {
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gst_video::VideoFormat::Bgra => gdk::MemoryFormat::B8g8r8a8,
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gst_video::VideoFormat::Argb => gdk::MemoryFormat::A8r8g8b8,
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gst_video::VideoFormat::Rgba => gdk::MemoryFormat::R8g8b8a8,
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gst_video::VideoFormat::Abgr => gdk::MemoryFormat::A8b8g8r8,
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gst_video::VideoFormat::Rgb => gdk::MemoryFormat::R8g8b8,
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gst_video::VideoFormat::Bgr => gdk::MemoryFormat::B8g8r8,
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_ => unreachable!(),
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};
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let width = frame.width();
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let height = frame.height();
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let rowstride = frame.plane_stride()[0] as usize;
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let texture = gdk::MemoryTexture::new(
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width as i32,
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height as i32,
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format,
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&glib::Bytes::from_owned(FrameWrapper(frame)),
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rowstride,
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)
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.upcast::<gdk::Texture>();
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cached_textures.insert(texture_id, texture.clone());
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used_textures.insert(texture_id);
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(texture, pixel_aspect_ratio)
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}
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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fn video_frame_to_gl_texture(
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frame: gst_gl::GLVideoFrame<gst_gl::gl_video_frame::Readable>,
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cached_textures: &mut HashMap<usize, gdk::Texture>,
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used_textures: &mut HashSet<usize>,
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gdk_context: &gdk::GLContext,
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wrapped_context: &gst_gl::GLContext,
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) -> (gdk::Texture, f64) {
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let texture_id = frame.texture_id(0).expect("Invalid texture id") as usize;
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let pixel_aspect_ratio =
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(frame.info().par().numer() as f64) / (frame.info().par().denom() as f64);
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if let Some(texture) = cached_textures.get(&(texture_id)) {
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used_textures.insert(texture_id);
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return (texture.clone(), pixel_aspect_ratio);
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}
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let width = frame.width();
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let height = frame.height();
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let sync_meta = frame.buffer().meta::<gst_gl::GLSyncMeta>().unwrap();
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sync_meta.wait(wrapped_context);
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let texture = unsafe {
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gdk::GLTexture::with_release_func(
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gdk_context,
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texture_id as u32,
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width as i32,
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height as i32,
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move || {
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// Unmap and drop the GStreamer GL texture once GTK is done with it and not earlier
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drop(frame);
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},
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)
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.upcast::<gdk::Texture>()
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};
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cached_textures.insert(texture_id, texture.clone());
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used_textures.insert(texture_id);
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(texture, pixel_aspect_ratio)
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}
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impl Frame {
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pub(crate) fn into_textures(
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self,
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#[allow(unused_variables)] gdk_context: Option<&gdk::GLContext>,
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cached_textures: &mut HashMap<usize, gdk::Texture>,
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) -> Vec<Texture> {
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let mut textures = Vec::with_capacity(1 + self.overlays.len());
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let mut used_textures = HashSet::with_capacity(1 + self.overlays.len());
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let width = self.frame.width();
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let height = self.frame.height();
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let has_alpha = self.frame.format_info().has_alpha();
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let (texture, pixel_aspect_ratio) = match self.frame {
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MappedFrame::SysMem(frame) => {
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video_frame_to_memory_texture(frame, cached_textures, &mut used_textures)
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}
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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MappedFrame::GL {
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frame,
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wrapped_context,
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} => {
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let Some(gdk_context) = gdk_context else {
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// This will fail badly if the video frame was actually mapped as GL texture
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// but this case can't really happen as we only do that if we actually have a
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// GDK GL context.
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unreachable!();
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};
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video_frame_to_gl_texture(
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frame,
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cached_textures,
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&mut used_textures,
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gdk_context,
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&wrapped_context,
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)
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}
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};
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textures.push(Texture {
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texture,
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x: 0.0,
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y: 0.0,
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width: width as f32 * pixel_aspect_ratio as f32,
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height: height as f32,
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global_alpha: 1.0,
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has_alpha,
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});
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for overlay in self.overlays {
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let has_alpha = overlay.frame.format_info().has_alpha();
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let (texture, _pixel_aspect_ratio) =
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video_frame_to_memory_texture(overlay.frame, cached_textures, &mut used_textures);
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textures.push(Texture {
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texture,
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x: overlay.x as f32,
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y: overlay.y as f32,
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width: overlay.width as f32,
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height: overlay.height as f32,
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global_alpha: overlay.global_alpha,
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has_alpha,
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});
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}
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// Remove textures that were not used this time
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cached_textures.retain(|id, _| used_textures.contains(id));
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textures
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}
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}
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impl Frame {
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pub(crate) fn new(
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buffer: &gst::Buffer,
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info: &gst_video::VideoInfo,
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))] wrapped_context: Option<
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&gst_gl::GLContext,
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>,
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#[allow(unused_variables)]
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#[cfg(not(any(target_os = "macos", target_os = "windows", feature = "gst_gl")))]
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wrapped_context: Option<&()>,
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) -> Result<Self, gst::FlowError> {
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// Empty buffers get filtered out in show_frame
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debug_assert!(buffer.n_memory() > 0);
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let mut frame;
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#[cfg(not(any(target_os = "macos", target_os = "windows", feature = "gst_gl")))]
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{
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frame = Self {
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frame: MappedFrame::SysMem(
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gst_video::VideoFrame::from_buffer_readable(buffer.clone(), info)
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.map_err(|_| gst::FlowError::Error)?,
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),
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overlays: vec![],
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};
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}
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#[cfg(any(target_os = "macos", target_os = "windows", feature = "gst_gl"))]
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{
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// Check we received a buffer with GL memory and if the context of that memory
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// can share with the wrapped context around the GDK GL context.
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//
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// If not it has to be uploaded to the GPU.
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let memory_ctx = buffer
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.peek_memory(0)
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.downcast_memory_ref::<gst_gl::GLBaseMemory>()
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.and_then(|m| {
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let ctx = m.context();
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if wrapped_context
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.map_or(false, |wrapped_context| wrapped_context.can_share(ctx))
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{
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Some(ctx)
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} else {
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None
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}
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});
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if let Some(memory_ctx) = memory_ctx {
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// If there is no GLSyncMeta yet then we need to add one here now, which requires
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// obtaining a writable buffer.
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let mapped_frame = if buffer.meta::<gst_gl::GLSyncMeta>().is_some() {
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gst_gl::GLVideoFrame::from_buffer_readable(buffer.clone(), info)
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.map_err(|_| gst::FlowError::Error)?
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} else {
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let mut buffer = buffer.clone();
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{
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let buffer = buffer.make_mut();
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gst_gl::GLSyncMeta::add(buffer, memory_ctx);
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}
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gst_gl::GLVideoFrame::from_buffer_readable(buffer, info)
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.map_err(|_| gst::FlowError::Error)?
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};
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// Now that it's guaranteed that there is a sync meta and the frame is mapped, set
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// a sync point so we can ensure that the texture is ready later when making use of
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// it as gdk::GLTexture.
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let meta = mapped_frame.buffer().meta::<gst_gl::GLSyncMeta>().unwrap();
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meta.set_sync_point(memory_ctx);
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frame = Self {
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frame: MappedFrame::GL {
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frame: mapped_frame,
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wrapped_context: wrapped_context.unwrap().clone(),
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},
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overlays: vec![],
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};
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} else {
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frame = Self {
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frame: MappedFrame::SysMem(
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gst_video::VideoFrame::from_buffer_readable(buffer.clone(), info)
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.map_err(|_| gst::FlowError::Error)?,
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),
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overlays: vec![],
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};
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}
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}
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frame.overlays = frame
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.frame
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.buffer()
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.iter_meta::<gst_video::VideoOverlayCompositionMeta>()
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.flat_map(|meta| {
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meta.overlay()
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.iter()
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.filter_map(|rect| {
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let buffer = rect
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.pixels_unscaled_argb(gst_video::VideoOverlayFormatFlags::GLOBAL_ALPHA);
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let (x, y, width, height) = rect.render_rectangle();
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let global_alpha = rect.global_alpha();
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let vmeta = buffer.meta::<gst_video::VideoMeta>().unwrap();
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let info = gst_video::VideoInfo::builder(
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vmeta.format(),
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vmeta.width(),
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vmeta.height(),
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)
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.build()
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.unwrap();
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let frame =
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gst_video::VideoFrame::from_buffer_readable(buffer, &info).ok()?;
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Some(Overlay {
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frame,
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x,
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y,
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width,
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height,
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global_alpha,
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})
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})
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.collect::<Vec<_>>()
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})
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.collect();
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Ok(frame)
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}
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}
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