begin adding provision for hardware encoding functionality

server/Cargo.lock

@@ -273,6 +273,15 @@ dependencies = [
  "typenum",
 ]
 
+[[package]]
+name = "cudarc"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cd60a9a42ec83a2ed7effb0b1f073270264ea99da7acfc44f7e8d74dee0384"
+dependencies = [
+ "libloading",
+]
+
 [[package]]
 name = "data-encoding"
 version = "2.6.0"
@@ -1317,6 +1326,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "axum",
+ "cudarc",
  "ffmpeg-next",
  "futures",
  "futures-util",

server/Cargo.toml

@@ -23,6 +23,7 @@ ffmpeg = { version = "7.0.0", package = "ffmpeg-next" }
 rand = "0.8.5"
 serde = "1.0.209"
 serde_json = "1.0.128"
+cudarc = "0.12.1"
 
 
 [patch.crates-io]

server/src/video/encoder_thread.rs

@@ -7,6 +7,8 @@ use tokio::sync::mpsc::{self, error::TryRecvError};
 use super::ffmpeg;
 use super::h264_encoder::H264Encoder;
 
+use super::hwframe::HwFrameContext;
+
 pub enum EncodeThreadInput {
     Init { size: crate::types::Size },
     ForceKeyframe,
@@ -33,6 +35,36 @@ fn set_frame_flags(frame: &mut ffmpeg::Frame, force_keyframe: bool) {
     }
 }
 
+fn create_frame(
+    width: u32,
+    height: u32,
+    pixel_format: ffmpeg::format::Pixel,
+    context: &mut HwFrameContext,
+) -> anyhow::Result<ffmpeg::Frame> {
+    unsafe {
+        let mut frame = ffmpeg::Frame::empty();
+        (*frame.as_mut_ptr()).format = pixel_format as i32;
+        (*frame.as_mut_ptr()).width = width as i32;
+        (*frame.as_mut_ptr()).height = height as i32;
+        (*frame.as_mut_ptr()).hw_frames_ctx = context.as_raw_mut();
+
+        super::check_ret(ffmpeg::sys::av_hwframe_get_buffer(
+            context.as_raw_mut(),
+            frame.as_mut_ptr(),
+            0,
+        ))?;
+        super::check_ret(ffmpeg::sys::av_hwframe_get_buffer(
+            context.as_raw_mut(),
+            frame.as_mut_ptr(),
+            0,
+        ))?;
+
+        (*frame.as_mut_ptr()).linesize[0] = (*frame.as_ptr()).width * 4;
+
+        Ok(frame)
+    }
+}
+
 fn encoder_thread_main(
     mut rx: mpsc::Receiver<EncodeThreadInput>,
     tx: mpsc::Sender<EncodeThreadOutput>,

server/src/video/h264_encoder.rs

@@ -1,8 +1,9 @@
 use super::ffmpeg;
+use super::hwframe::HwFrameContext;
 use anyhow::Context;
 use ffmpeg::error::EAGAIN;
 
-use ffmpeg::codec as lavc; // lavc
+use ffmpeg::{codec as lavc, packet}; // lavc
 
 use crate::types::Size;
 
@@ -30,8 +31,6 @@ fn create_context_and_set_common_parameters(
 
     let mut video_encoder_context = create_context_from_codec(encoder)?.encoder().video()?;
 
-
-
     video_encoder_context.set_width(size.width);
     video_encoder_context.set_height(size.height);
     video_encoder_context.set_frame_rate(Some(ffmpeg::Rational(1, max_framerate as i32)));
@@ -63,8 +62,15 @@ fn create_context_and_set_common_parameters(
 
 /// A simple H.264 encoder. Currently software only, however
 /// pieces are being put in place to eventually allow HW encoding.
-pub struct H264Encoder {
+pub enum H264Encoder {
+    Software {
         encoder: ffmpeg::encoder::video::Encoder,
+    },
+
+    Nvenc {
+        encoder: ffmpeg::encoder::video::Encoder,
+        hw_context: HwFrameContext,
+    },
 }
 
 impl H264Encoder {
@@ -107,21 +113,68 @@ impl H264Encoder {
             .open_as_with(encoder, dict)
             .with_context(|| "While opening x264 video codec")?;
 
-        Ok(Self { encoder: encoder })
+        Ok(Self::Software { encoder: encoder })
+    }
+
+    // FIXME: It's a bit pointless to have this have a mut borrow,
+    // but you'll probably have a mutable borrow on this already..
+    pub fn is_hardware(&mut self) -> bool {
+        match self {
+            Self::Software { .. } => false,
+            Self::Nvenc { .. } => true,
+        }
     }
 
     pub fn send_frame(&mut self, frame: &ffmpeg::Frame) {
-        self.encoder.send_frame(frame).unwrap();
+        match self {
+            Self::Software { encoder } => {
+                encoder.send_frame(frame).unwrap();
+            }
+
+            Self::Nvenc {
+                encoder,
+                hw_context,
+            } => {
+                // Realistically this should be the same right?
+                todo!("Requires support.");
+            }
+        }
     }
 
     pub fn send_eof(&mut self) {
-        self.encoder.send_eof().unwrap();
+        match self {
+            Self::Software { encoder } => {
+                encoder.send_eof().unwrap();
+            }
+
+            Self::Nvenc {
+                encoder,
+                hw_context,
+            } => {
+                // Realistically this should be the same right?
+                todo!("Requires support.");
+            }
+        }
+    }
+
+    fn receive_packet_impl(&mut self, packet: &mut ffmpeg::Packet) -> Result<(), ffmpeg::Error> {
+        return match self {
+            Self::Software { encoder } => encoder.receive_packet(packet),
+
+            Self::Nvenc {
+                encoder,
+                hw_context,
+            } => {
+                // Realistically this should be the same right?
+                todo!("Requires support.");
+            }
+        };
     }
 
     // Shuold this return a Result<ControlFlow> so we can make it easier to know when to continue?
     pub fn receive_packet(&mut self, packet: &mut ffmpeg::Packet) -> anyhow::Result<()> {
         loop {
-            match self.encoder.receive_packet(packet) {
+            match self.receive_packet_impl(packet) {
                 Ok(_) => break,
                 Err(ffmpeg::Error::Other { errno }) => {
                     if errno != EAGAIN {

server/src/video/hwdevice.rs

@@ -0,0 +1,78 @@
+use std::ptr::null_mut;
+
+use super::check_ret;
+
+use super::ffmpeg;
+
+pub struct CudaDeviceContext {
+	buffer: *mut ffmpeg::sys::AVBufferRef,
+}
+
+impl CudaDeviceContext {
+	fn new(buffer: *mut ffmpeg::sys::AVBufferRef) -> Self {
+		Self { buffer }
+	}
+
+	// pub fn as_device_mut(&mut self) -> &mut ffmpeg::sys::AVHWDeviceContext {
+	// 	unsafe { &mut *((*self.buffer).data as *mut ffmpeg::sys::AVHWDeviceContext) }
+	// }
+
+	// pub fn as_device(&self) -> &ffmpeg::sys::AVHWDeviceContext {
+	// 	unsafe { &*((*self.buffer).data as *const ffmpeg::sys::AVHWDeviceContext) }
+	// }
+
+	pub fn as_raw_mut(&mut self) -> &mut ffmpeg::sys::AVBufferRef {
+		unsafe { &mut *self.buffer }
+	}
+
+	// pub fn as_raw(&self) -> &ffmpeg::sys::AVBufferRef {
+	// 	unsafe { &*self.buffer }
+	// }
+}
+
+pub struct CudaDeviceContextBuilder {
+	buffer: *mut ffmpeg::sys::AVBufferRef,
+}
+
+impl CudaDeviceContextBuilder {
+	pub fn new() -> Result<Self, String> {
+		let buffer = unsafe { ffmpeg::sys::av_hwdevice_ctx_alloc(ffmpeg::sys::AVHWDeviceType::AV_HWDEVICE_TYPE_CUDA) };
+		if buffer.is_null() {
+			return Err("could not allocate a hwdevice".to_string());
+		}
+
+		Ok(Self { buffer })
+	}
+
+	pub fn build(mut self) -> Result<CudaDeviceContext, ffmpeg::Error> {
+		check_ret(unsafe { ffmpeg::sys::av_hwdevice_ctx_init(self.buffer) })?;
+		let result = Ok(CudaDeviceContext::new(self.buffer));
+		self.buffer = null_mut();
+
+		result
+	}
+
+	pub fn set_cuda_context(mut self, context: ffmpeg::sys::CUcontext) -> Self {
+		unsafe {
+			(*(self.as_device_mut().hwctx as *mut ffmpeg::sys::AVCUDADeviceContext)).cuda_ctx = context;
+		}
+
+		self
+	}
+
+	pub fn as_device_mut(&mut self) -> &mut ffmpeg::sys::AVHWDeviceContext {
+		unsafe { &mut *((*self.buffer).data as *mut ffmpeg::sys::AVHWDeviceContext) }
+	}
+
+	// pub fn as_device(&self) -> &ffmpeg::sys::AVHWDeviceContext {
+	// 	unsafe { &*((*self.buffer).data as *const ffmpeg::sys::AVHWDeviceContext) }
+	// }
+
+	// pub fn as_raw_mut(&mut self) -> &mut ffmpeg::sys::AVBufferRef {
+	// 	unsafe { &mut *self.buffer }
+	// }
+
+	// pub fn as_raw(&self) -> &ffmpeg::sys::AVBufferRef {
+	// 	unsafe { &*self.buffer }
+	// }
+}

server/src/video/hwframe.rs

@@ -0,0 +1,88 @@
+use std::ptr::null_mut;
+
+use super::ffmpeg;
+
+use ffmpeg::format::Pixel;
+
+use super::{check_ret, hwdevice::CudaDeviceContext};
+
+pub struct HwFrameContext {
+	_cuda_device_context: CudaDeviceContext,
+	buffer: *mut ffmpeg::sys::AVBufferRef,
+}
+
+impl HwFrameContext {
+	fn new(cuda_device_context: CudaDeviceContext, buffer: *mut ffmpeg::sys::AVBufferRef) -> Self {
+		Self { _cuda_device_context: cuda_device_context, buffer }
+	}
+
+	// pub fn as_context_mut(&mut self) -> &mut ffmpeg::sys::AVHWFramesContext {
+	// 	unsafe { &mut *((*self.buffer).data as *mut ffmpeg::sys::AVHWFramesContext) }
+	// }
+
+	// pub fn as_context(&self) -> &ffmpeg::sys::AVHWFramesContext {
+	// 	unsafe { &*((*self.buffer).data as *const ffmpeg::sys::AVHWFramesContext) }
+	// }
+
+	pub fn as_raw_mut(&mut self) -> &mut ffmpeg::sys::AVBufferRef {
+		unsafe { &mut *self.buffer }
+	}
+
+	// pub fn as_raw(&self) -> &ffmpeg::sys::AVBufferRef {
+	// 	unsafe { &*self.buffer }
+	// }
+}
+
+unsafe impl Send for HwFrameContext { }
+
+pub struct HwFrameContextBuilder {
+	cuda_device_context: CudaDeviceContext,
+	buffer: *mut ffmpeg::sys::AVBufferRef,
+}
+
+impl HwFrameContextBuilder {
+	pub fn new(mut cuda_device_context: CudaDeviceContext) -> Result<Self, String> {
+		let buffer = unsafe { ffmpeg::sys::av_hwframe_ctx_alloc(cuda_device_context.as_raw_mut()) };
+		if buffer.is_null() {
+			return Err("could not allocate a hwframe".to_string());
+		}
+
+		Ok(Self { cuda_device_context, buffer })
+	}
+
+	pub fn build(mut self) -> Result<HwFrameContext, ffmpeg::Error> {
+		check_ret(unsafe { ffmpeg::sys::av_hwframe_ctx_init(self.buffer) })?;
+		let result = Ok(HwFrameContext::new(self.cuda_device_context, self.buffer));
+		self.buffer = null_mut();
+
+		result
+	}
+
+	pub fn set_width(mut self, width: u32) -> Self {
+		self.as_frame_mut().width = width as i32;
+		self
+	}
+
+	pub fn set_height(mut self, height: u32) -> Self {
+		self.as_frame_mut().height = height as i32;
+		self
+	}
+
+	pub fn set_sw_format(mut self, sw_format: Pixel) -> Self {
+		self.as_frame_mut().sw_format = sw_format.into();
+		self
+	}
+
+	pub fn set_format(mut self, format: Pixel) -> Self {
+		self.as_frame_mut().format = format.into();
+		self
+	}
+
+	pub fn as_frame_mut(&mut self) -> &mut ffmpeg::sys::AVHWFramesContext {
+		unsafe { &mut *((*self.buffer).data as *mut ffmpeg::sys::AVHWFramesContext) }
+	}
+
+	// pub fn as_frame(&self) -> &ffmpeg::sys::AVHWFramesContext {
+	// 	unsafe { &*((*self.buffer).data as *const ffmpeg::sys::AVHWFramesContext) }
+	// }
+}

server/src/video/mod.rs

@@ -5,5 +5,16 @@ pub mod h264_encoder;
 /// Re-export of `ffmpeg_the_third` crate in an infinitely less obtuse name.
 pub use ffmpeg as ffmpeg;
 
+pub mod hwdevice;
+pub mod hwframe;
 
 pub use encoder_thread::*;
+
+// from hgaiser/moonshine
+pub fn check_ret(error_code: i32) -> Result<(), ffmpeg::Error> {
+	if error_code != 0 {
+		return Err(ffmpeg::Error::from(error_code));
+	}
+
+	Ok(())
+}