diff options
| -rw-r--r-- | .gitignore | 2 | ||||
| -rw-r--r-- | Cargo.lock | 867 | ||||
| -rw-r--r-- | Cargo.toml | 11 | ||||
| -rw-r--r-- | src/color.rs | 12 | ||||
| -rw-r--r-- | src/lib.rs | 2 | ||||
| -rw-r--r-- | src/main.rs | 197 | ||||
| -rw-r--r-- | src/v4l2.rs | 506 | ||||
| -rw-r--r-- | v4l2-sys/Cargo.toml | 27 | ||||
| -rw-r--r-- | v4l2-sys/GPL-3 | 674 | ||||
| -rw-r--r-- | v4l2-sys/LICENSE.txt | 165 | ||||
| -rw-r--r-- | v4l2-sys/README.md | 16 | ||||
| -rw-r--r-- | v4l2-sys/build.rs | 15 | ||||
| -rw-r--r-- | v4l2-sys/src/lib.rs | 148 | ||||
| -rw-r--r-- | v4l2-sys/wrapper.h | 1 |
14 files changed, 2643 insertions, 0 deletions
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"serde_spanned", + "toml_datetime", + "winnow", +] + +[[package]] +name = "unicode-ident" +version = "1.0.13" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe" + +[[package]] +name = "v4l2-sys" +version = "1.1.0" +dependencies = [ + "bindgen", + "libc", +] + +[[package]] +name = "version-compare" +version = "0.1.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "579a42fc0b8e0c63b76519a339be31bed574929511fa53c1a3acae26eb258f29" + +[[package]] +name = "winnow" +version = "0.6.18" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "Could not get crate checksum" +dependencies = [ + "memchr", +] diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..a3c4b23 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "sshcamera" +version = "0.1.0" +edition = "2021" + +[dependencies] +libc = "0.2" +v4l2-sys = { version = "1", path = "v4l2-sys/" } +anyhow = "1" +gtk4 = "0.9" +jpeg-decoder = "0.3" diff --git a/src/color.rs b/src/color.rs new file mode 100644 index 0000000..3b27fa0 --- /dev/null +++ b/src/color.rs @@ -0,0 +1,12 @@ +// TODO: avoid using float +pub fn yuv2rgb(y: u8, u: u8, v: u8) -> (u8, u8, u8){ + fn rc(v: f64) -> u8{ v.round().clamp(0., 255.) as u8 } + let y = y as f64; + let u = u as f64 - 128.; + let v = v as f64 - 128.; + ( + rc(y + 1.402*v), + rc(y - 0.344*u - 0.714*v), + rc(y + 1.772*u ), + ) +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..cf29039 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,2 @@ +pub mod v4l2; +pub mod color; diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..b1a4404 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,197 @@ +#![allow(unused)] + +use anyhow::{anyhow, Result}; +use std::sync::{Arc, Mutex}; +use std::future::poll_fn; +use std::task::{Context, Poll, Waker}; +use std::thread; + +use gtk4::{self as gtk, glib, cairo}; +use gtk4::prelude::*; +use glib::{clone, spawn_future_local}; + +use sshcamera::v4l2::{Device as V4l2, Field}; +use sshcamera::color::yuv2rgb; +use jpeg_decoder::{self as jpeg, Decoder as JpegDec}; + +struct SignalChannel{ + waker: Option<Waker>, + active: bool, +} +impl SignalChannel{ + fn new() -> Self{ + Self{ + waker: None, + active: false, + } + } + fn wake(&mut self){ + self.active = true; + if let Some(w) = self.waker.take(){ + w.wake(); + } + } + fn poll(this: &Arc<Mutex<Self>>, ctx: &mut Context<'_>) -> Poll<()>{ + let mut l = this.lock().unwrap(); + if l.active{ + l.active = false; + Poll::Ready(()) + }else{ + l.waker = Some(ctx.waker().clone()); + Poll::Pending + } + } +} + +#[derive(Clone)] +struct AppState{ + frame_buf: Arc<Mutex<Option<cairo::ImageSurfaceDataOwned>>>, + notify: Arc<Mutex<SignalChannel>>, + fbpool: Arc<Mutex<Vec<cairo::ImageSurfaceDataOwned>>>, +} + +fn videothread(apps: AppState) -> Result<()>{ + let v = V4l2::open("/dev/video0")?; + + // TODO: It should be better. + let c = v.captstream_builder()? + .set_pixelformat("MJPG".into()) + //.set_pixelformat("YUYV".into()) + .set_field(Field::None) + .build()?; + assert!(["YUYV", "MJPG"].contains(&c.pixelformat().as_str())); + assert!(c.field() == Field::None); + + let (w, h) = (c.width(), c.height()); + let s = c.bytesperline(); + loop{ + let img: Result<cairo::ImageSurface> = c.next(|frame, _|{ + let mut img = cairo::ImageSurface::create( + cairo::Format::Rgb24, + w.try_into()?, h.try_into()?)?; + let stride: usize = img.stride().try_into()?; + let mut imgslice = img.data()?; + match c.pixelformat().as_str(){ + "YUYV" => { + for (x, y) in (0..h).map( + |y| (0..w).map(move |x|(x, y))).flatten(){ + let p = s*y + x*2; + let (r, g, b) = yuv2rgb( + frame[p], frame[p/4*4 + 1], frame[p/4*4 + 3]); + imgslice[stride*y + x*4 + 0] = b; + imgslice[stride*y + x*4 + 1] = g; + imgslice[stride*y + x*4 + 2] = r; + } + drop(imgslice); + Ok(img) + }, + "MJPG" => { + // Jpeg is not placed in start of slice in some situation. + // It is even possible that there are no Jpeg data. + let jindex = (0..frame.len()-1) + .filter(|i| frame[*i] == 0xff && frame[i+1] == 0xd8) + .next() + .ok_or(anyhow!("jpeg not found"))?; + let mut jpeg = JpegDec::new(&frame[jindex..]); + let b = jpeg.decode()?; + let info = jpeg.info().unwrap(); + assert!((info.width as usize, info.height as usize) + == (w, h)); + for (x, y) in (0..h).map( + |y| (0..w).map(move |x|(x, y))).flatten(){ + imgslice[stride*y + x*4 + 0] = b[(y*w+x)*3 + 0]; + imgslice[stride*y + x*4 + 1] = b[(y*w+x)*3 + 1]; + imgslice[stride*y + x*4 + 2] = b[(y*w+x)*3 + 2]; + } + drop(imgslice); + Ok(img) + }, + _ => unreachable!(), + } + }).unwrap_or_else(|e| Err(e.into())); + + match img{ + Ok(img) => { + *apps.frame_buf.lock().unwrap() = Some(img.take_data().unwrap()); + apps.notify.lock().unwrap().wake(); + }, + Err(err) => { + println!("Skipping erroneous frame: {:?}", err); + }, + } + } +} + +fn gtkmain(app: >k::Application){ + let apps = AppState{ + frame_buf: Arc::new(Mutex::new(None)), + notify: Arc::new(Mutex::new(SignalChannel::new())), + fbpool: Arc::new(Mutex::new(Vec::new())), + }; + + thread::spawn(clone!{ + #[strong] apps, + move || videothread(apps).unwrap() + }); + + let draw = gtk::DrawingArea::new(); + let mut frame_cache = None; + draw.set_draw_func(clone!{ + #[strong(rename_to=frame_buf)] apps.frame_buf, + move |_draw, ctx, canvas_w, canvas_h|{ + ctx.set_source_rgb(0., 0., 0.); + ctx.paint().unwrap(); + + if let Some(newfb) = frame_buf.lock().unwrap().take(){ + frame_cache = Some(newfb.into_inner()); + } + if let Some(image) = frame_cache.clone(){ + //{ + // let stride: usize = isurface.stride().try_into().unwrap(); + // let mut isdata = isurface.data().unwrap(); + // for y in 0..image.height{ + // for x in 0..image.width{ + // for c in 0..4{ + // isdata[stride*y + x*4 + c] + // = image.buf[(image.width*y+x)*4 + c]; + // } + // } + // } + //} + let ipat = cairo::SurfacePattern::create(&image); + let scale = ((canvas_w as f64) / (image.width() as f64)).min( + (canvas_h as f64) / (image.height() as f64)); + ctx.scale(scale, scale); + ctx.set_source(&ipat).unwrap(); + ctx.paint().unwrap(); + } + } + }); + spawn_future_local(poll_fn(clone!{ + #[strong(rename_to=notify)] apps.notify, + #[strong] draw, + move |ctx|{ + loop{ + match SignalChannel::poll(¬ify, ctx){ + Poll::Ready(_) => { + draw.queue_draw(); + }, + pending => return pending, + } + } + } + })); + + let win = gtk::ApplicationWindow::builder() + .application(app) + .child(&draw) + .build(); + win.present(); +} + +fn main() -> Result<glib::ExitCode>{ + let app = gtk::Application::builder() + .build(); + app.connect_activate(gtkmain); + Ok(app.run()) +} diff --git a/src/v4l2.rs b/src/v4l2.rs new file mode 100644 index 0000000..96cc356 --- /dev/null +++ b/src/v4l2.rs @@ -0,0 +1,506 @@ +use libc as c; +use v4l2_sys as v4l2; +use std::mem::{MaybeUninit, zeroed, replace}; +use std::ptr::null_mut; +use std::slice::from_raw_parts; +use std::os::fd::RawFd; +use std::path::Path; +use std::io::Error as IoError; +use std::fmt::{Display, Debug, Formatter, Error as FmtError}; +use std::error::Error as ErrorTrait; +use std::{str, iter, array}; + +macro_rules! define_flagset{ + ($tname:ident: $ctype:ty; $($name:ident = $mask:expr),+) => { + #[derive(Copy, Clone, Debug, PartialEq, Eq)] + pub struct $tname{ $($name: bool),+ } + impl $tname{ + pub fn zero() -> Self{ + Self{ $($name: false),+ } + } + } + impl From<$ctype> for $tname{ + fn from(src: $ctype) -> Self{ + let mut ret = Self::zero(); + $( + if src & $mask != 0{ + ret.$name = true; + } + )+ + ret + } + } + impl From<$tname> for $ctype{ + fn from(src: $tname) -> Self{ + let mut ret = 0; + $( + if src.$name{ + ret |= $mask; + } + )+ + ret + } + } + }; +} +macro_rules! define_cenum{ + ($tname:ident: $ctype:ty; $($name:ident = $mask:expr),+) => { + #[derive(Copy, Clone, Debug, PartialEq, Eq)] + #[repr($ctype)] + pub enum $tname{ + $($name = $mask),+ + } + impl From<$ctype> for $tname{ + fn from(src: $ctype) -> Self{ + $(if src == $mask{ + return Self::$name; + })+ + panic!("{} is invalid value for {}", src, stringify!($tname)); + } + } + impl From<$tname> for $ctype{ + fn from(src: $tname) -> Self{ + src as Self + } + } + }; +} + +define_flagset!{ BufFlags: u32; + mapped = v4l2::V4L2_BUF_FLAG_MAPPED, + queued = v4l2::V4L2_BUF_FLAG_QUEUED, + done = v4l2::V4L2_BUF_FLAG_DONE, + error = v4l2::V4L2_BUF_FLAG_ERROR, + keyframe = v4l2::V4L2_BUF_FLAG_KEYFRAME, + pframe = v4l2::V4L2_BUF_FLAG_PFRAME, + bframe = v4l2::V4L2_BUF_FLAG_BFRAME, + timecode = v4l2::V4L2_BUF_FLAG_TIMECODE, + prepared = v4l2::V4L2_BUF_FLAG_PREPARED, + no_cache_invalidate = v4l2::V4L2_BUF_FLAG_NO_CACHE_INVALIDATE, + no_cache_clean = v4l2::V4L2_BUF_FLAG_NO_CACHE_CLEAN, + last = v4l2::V4L2_BUF_FLAG_LAST +} +define_cenum!{ Field: u32; + Any = v4l2::v4l2_field_V4L2_FIELD_ANY, + None = v4l2::v4l2_field_V4L2_FIELD_NONE, + Top = v4l2::v4l2_field_V4L2_FIELD_TOP, + Bottom = v4l2::v4l2_field_V4L2_FIELD_BOTTOM, + Interlaced = v4l2::v4l2_field_V4L2_FIELD_INTERLACED, + SeqTb = v4l2::v4l2_field_V4L2_FIELD_SEQ_TB, + SeqBt = v4l2::v4l2_field_V4L2_FIELD_SEQ_BT, + Alternate = v4l2::v4l2_field_V4L2_FIELD_ALTERNATE, + InterlacedTb = v4l2::v4l2_field_V4L2_FIELD_INTERLACED_TB, + InterlacedBt = v4l2::v4l2_field_V4L2_FIELD_INTERLACED_BT +} +#[derive(Copy, Clone, PartialEq, Eq)] +pub struct ImageFormat([u8; 4]); +impl ImageFormat{ + pub fn slice(&self) -> &[u8]{ + let p = self.0.iter().rev() + .position(|c| *c != 0x20) + .unwrap_or(4); + &self.0[..4-p] + } + pub fn as_str(&self) -> &str{ + // XXX: it is invalid when self.be() + str::from_utf8(self.slice()).unwrap() + } + pub fn name(&self) -> String{ + let s = self.slice(); + let v = iter::once(s[0] & 0x7f).chain(s[1..].iter().copied()).collect(); + String::from_utf8(v).unwrap() + } + pub fn be(&self) -> bool{ + self.0[0] & 0x80 != 0 + } +} +impl From<&str> for ImageFormat{ + fn from(mut src: &str) -> Self{ + let be = + if src.ends_with(":be"){ + let l = src.len(); + src = &src[..l-3]; + true + }else{ + false + }; + assert!(src.chars().skip(4).next().is_none()); + let mut a: [u8; 4] = array::from_fn( + |n| src.chars().skip(n).next().unwrap_or(' ') as u8); + if be{ a[0] |= 0x80; } + Self(a) + } +} +impl From<u32> for ImageFormat{ + fn from(src: u32) -> Self{ + Self(src.to_le_bytes()) + } +} +impl From<ImageFormat> for u32{ + fn from(src: ImageFormat) -> Self{ + Self::from_le_bytes(src.0) + } +} +impl Debug for ImageFormat{ + fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), FmtError>{ + write!(f, "ImageFormat({}{})", + self.name(), + if self.be(){ ":be" }else{ "" }) + } +} + +#[derive(Copy, Clone)] +pub struct BufAttrs{ + pub flags: BufFlags, + pub field: Field, + pub timestamp: c::timeval, + pub sequence: u32, +} +impl Debug for BufAttrs{ + fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), FmtError>{ + #[derive(Debug)] + #[allow(non_camel_case_types,unused)] + struct timeval{ + tv_sec: c::time_t, + tv_usec: c::suseconds_t, + } + f.debug_struct("BufAttrs") + .field("flags", &self.flags) + .field("field", &self.field) + .field("timestamp", &timeval{ + tv_sec: self.timestamp.tv_sec, + tv_usec: self.timestamp.tv_usec, + }) + .field("sequence", &self.sequence) + .finish() + } +} + +#[derive(Copy, Clone, Debug)] +struct MmappedBuffer{ + ptr: *mut u8, + length: u32, +} + +#[derive(Clone, Debug)] +enum IoMethod{ + Uninit, + Mmap(/* unsafe to construct */ Vec<MmappedBuffer>), +} + +#[derive(Debug)] +pub struct Device{ + fd: RawFd, + cap: v4l2::v4l2_capability, + io_capture: IoMethod, +} + +macro_rules! /* unsafe */ mk_ioctl_getter{ + ($name:ident, $type:ty, $op:expr; $($qn:ident: $qt:ty),*) => { + fn $name(&self, $($qn: $qt),*) -> Result<$type, IoError>{ + let mut val = MaybeUninit::<$type>::uninit(); + $(unsafe{ (&raw mut (*val.as_mut_ptr()).$qn).write($qn) };)* + + if unsafe{ c::ioctl(self.fd, $op, val.as_mut_ptr()) } < 0{ + Err(IoError::last_os_error()) + }else{ + Ok(unsafe{ val.assume_init() }) + } + } + }; +} +macro_rules! /* unsafe */ mk_ioctl_setter{ + ($name:ident, $type:ty, $op:expr) => { + fn $name(&self, mut val: $type) -> Result<$type, IoError>{ + if unsafe{ c::ioctl(self.fd, $op, &mut val as *mut $type) } < 0{ + Err(IoError::last_os_error()) + }else{ + Ok(val) + } + } + }; +} + +impl Device{ + pub unsafe fn from_rawfd(fd: RawFd) -> Result<Device, IoError>{ + let mut cap = MaybeUninit::<v4l2::v4l2_capability>::uninit(); + if unsafe{c::ioctl(fd, v4l2::VIDIOC_QUERYCAP, cap.as_mut_ptr())} < 0{ + return Err(IoError::last_os_error()); + } + let cap = cap.assume_init(); + + Ok(Device{ fd, cap, + io_capture: IoMethod::Uninit, + }) + } + pub fn open(path: impl AsRef<Path>) -> Result<Device, IoError>{ + let pathstr_bytes = path.as_ref().as_os_str().as_encoded_bytes(); + let p_bytes: Vec<u8> = pathstr_bytes.iter() + .copied() + .chain(iter::once(0)) + .collect(); + + let fd = unsafe{c::open( + p_bytes.as_ptr() as *const c::c_char, + c::O_RDWR)}; + if fd < 0{ + return Err(IoError::last_os_error()); + } + + unsafe{Device::from_rawfd(fd)} + } + mk_ioctl_getter!(ioctl_get_format, v4l2::v4l2_format, v4l2::VIDIOC_G_FMT; + type_: u32); + mk_ioctl_setter!(ioctl_set_format, v4l2::v4l2_format, v4l2::VIDIOC_S_FMT); + //mk_ioctl_getter!(ioctl_get_streamparm, + // v4l2::v4l2_streamparm, v4l2::VIDIOC_G_PARM; + // type_: u32); + //mk_ioctl_setter!(ioctl_set_streamparm, + // v4l2::v4l2_streamparm, v4l2::VIDIOC_S_PARM); + mk_ioctl_setter!(ioctl_req_buffers, + v4l2::v4l2_requestbuffers, v4l2::VIDIOC_REQBUFS); + mk_ioctl_setter!(ioctl_query_buffer, + v4l2::v4l2_buffer, v4l2::VIDIOC_QUERYBUF); + mk_ioctl_setter!(ioctl_queue_buffer, + v4l2::v4l2_buffer, v4l2::VIDIOC_QBUF); + mk_ioctl_getter!(ioctl_dequeue_buffer, + v4l2::v4l2_buffer, v4l2::VIDIOC_DQBUF; + type_: u32); + + unsafe fn unmap_bufs(bufs: Vec<MmappedBuffer>){ + for buf in bufs{ + if unsafe{ c::munmap( + buf.ptr as *mut c::c_void, buf.length as usize) } < 0{ + panic!("munmap: {:?}", IoError::last_os_error()); + } + } + } + fn uninit_io(&self, io: IoMethod, ty: u32) -> Result<(), IoError>{ + match io{ + IoMethod::Uninit => (), + IoMethod::Mmap(bufs) => { + unsafe{ Self::unmap_bufs(bufs) }; + if unsafe{ c::ioctl(self.fd, v4l2::VIDIOC_STREAMOFF, + &raw const ty as *const c::c_int) } < 0{ + return Err(IoError::last_os_error()); + } + }, + }; + Ok(()) + } + fn init_mmap_input(&self, ty: u32) -> Result<IoMethod, IoError>{ + let mut req = unsafe{ zeroed::<v4l2::v4l2_requestbuffers>() }; + req.count = 4; + req.type_ = ty; + req.memory = v4l2::v4l2_memory_V4L2_MEMORY_MMAP; + + let count = self.ioctl_req_buffers(req)?.count; + if count == 0{ + return Ok(IoMethod::Uninit); + } + + let mut bufrs = Vec::with_capacity(count as usize); + for i in 0..count{ + let mut buf = unsafe{ zeroed::<v4l2::v4l2_buffer>() }; + buf.type_ = ty; + buf.memory = v4l2::v4l2_memory_V4L2_MEMORY_MMAP; + buf.index = i; + let buf = self.ioctl_query_buffer(buf)?; + bufrs.push(buf); + + self.ioctl_queue_buffer(buf)?; + } + + if unsafe{ c::ioctl(self.fd, v4l2::VIDIOC_STREAMON, + &raw const ty as *const c::c_int) } < 0{ + return Err(IoError::last_os_error()); + } + + let mut bufs = Vec::with_capacity(count as usize); + for bufr in bufrs{ + let ptr = unsafe{ c::mmap(null_mut(), bufr.length as c::size_t, + c::PROT_READ | c::PROT_WRITE, c::MAP_SHARED, + self.fd, bufr.m.offset as c::off_t) }; + if ptr == c::MAP_FAILED{ + unsafe{ Self::unmap_bufs(bufs) }; + panic!("mmap: {:?}", IoError::last_os_error()); + } + bufs.push(MmappedBuffer{ptr: ptr as *mut u8, length: bufr.length}); + } + + Ok(IoMethod::Mmap(bufs)) + } + + fn dequeue<R>(&self, io: &IoMethod, ty: u32, + cb: impl FnOnce(&[u8], BufAttrs)->R + ) -> Result<R, IoError>{ + let bufr = self.ioctl_dequeue_buffer(ty)?; + let attrs = BufAttrs{ + flags: bufr.flags.into(), + field: bufr.field.into(), + timestamp: c::timeval{ + tv_sec: bufr.timestamp.tv_sec, + tv_usec: bufr.timestamp.tv_usec, + }, + sequence: bufr.sequence, + }; + let ret; + match io{ + IoMethod::Uninit => panic!(), + IoMethod::Mmap(ref mmb) => { + let buf = mmb[bufr.index as usize]; + assert!(bufr.bytesused <= buf.length); + let slice = unsafe{ from_raw_parts( + buf.ptr as *const u8, + bufr.bytesused as usize) }; + ret = cb(slice, attrs); + }, + } + self.ioctl_queue_buffer(bufr)?; + Ok(ret) + } + + pub fn captstream_builder(self) + -> Result<CaptStreamBuilder, CaptStreamBuilderNewError>{ + CaptStreamBuilder::new(self) + } +} +impl Drop for Device{ + fn drop(&mut self){ + let io_capture = replace(&mut self.io_capture, IoMethod::Uninit); + let _ = self.uninit_io(io_capture, + v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE); + // skip close error check + unsafe{ c::close(self.fd) }; + } +} + +#[derive(Debug)] +pub enum CaptStreamBuilderNewError{ + NoVideoCaptureCapability, + NoStreamingCapability, + IoError(IoError), +} +impl Display for CaptStreamBuilderNewError{ + fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), FmtError>{ + Debug::fmt(self, f) // TODO + } +} +impl ErrorTrait for CaptStreamBuilderNewError{} +impl From<IoError> for CaptStreamBuilderNewError{ + fn from(src: IoError) -> Self{ + Self::IoError(src) + } +} +pub struct CaptStreamBuilder{ + v4l2: Device, + pix_format: v4l2::v4l2_pix_format, + dirty: bool, +} +impl CaptStreamBuilder{ + pub fn new(v4l2: Device) -> Result<Self, CaptStreamBuilderNewError>{ + if v4l2.cap.capabilities & v4l2::V4L2_CAP_VIDEO_CAPTURE == 0{ + return Err(CaptStreamBuilderNewError::NoVideoCaptureCapability); + } + if v4l2.cap.capabilities & v4l2::V4L2_CAP_STREAMING == 0{ + return Err(CaptStreamBuilderNewError::NoStreamingCapability); + } + let fmt = v4l2.ioctl_get_format( + v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE)?; + assert!(fmt.type_ == v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE); + Ok(Self{ + v4l2, + pix_format: unsafe{ fmt.fmt.pix }, + dirty: false, + }) + } + pub fn build(self) -> Result<CaptStream, IoError>{ + let mut v4l2 = self.v4l2; + let mut pix_format = self.pix_format; + if self.dirty{ + let mut fmt: v4l2::v4l2_format = unsafe{ zeroed() }; + fmt.type_ = v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE; + fmt.fmt.pix = pix_format; + let fmt = v4l2.ioctl_set_format(fmt)?; + assert!(fmt.type_ + == v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE); + pix_format = unsafe{ fmt.fmt.pix }; + } + v4l2.io_capture = v4l2.init_mmap_input( + v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE)?; + Ok(CaptStream{ v4l2, pix_format }) + } + + pub fn set_width(mut self, v: usize) -> Self{ + self.pix_format.width = v as u32; + self.dirty = true; + self + } + pub fn set_height(mut self, v: usize) -> Self{ + self.pix_format.height = v as u32; + self.dirty = true; + self + } + pub fn set_pixelformat(mut self, v: ImageFormat) -> Self{ + self.pix_format.pixelformat = v.into(); + self.pix_format.bytesperline = 0; + self.dirty = true; + self + } + pub fn set_field(mut self, v: Field) -> Self{ + self.pix_format.field = v.into(); + self.dirty = true; + self + } + pub fn set_bytesperline(mut self, v: usize) -> Self{ + self.pix_format.bytesperline = v as u32; + self.dirty = true; + self + } + pub fn set_sizeimage(mut self, v: usize) -> Self{ + self.pix_format.sizeimage = v as u32; + self.dirty = true; + self + } +} + +macro_rules! impl_pix_format_reader{ + (+++ $n:ident: usize) => { + pub fn $n(&self) -> usize{ + self.format().$n as usize + } + }; + (+++ $n:ident: $t:ty) => { + pub fn $n(&self) -> $t{ + self.format().$n.into() + } + }; + ($t:ty) => { + impl $t{ + pub fn format(&self) -> v4l2::v4l2_pix_format{ + self.pix_format + } + impl_pix_format_reader!(+++ width: usize); + impl_pix_format_reader!(+++ height: usize); + impl_pix_format_reader!(+++ pixelformat: ImageFormat); + impl_pix_format_reader!(+++ field: Field); + impl_pix_format_reader!(+++ bytesperline: usize); + impl_pix_format_reader!(+++ sizeimage: usize); + //impl_pix_format_reader!(+++ colorspace: ColorSpace); + } + }; +} +impl_pix_format_reader!(CaptStreamBuilder); + +pub struct CaptStream{ + v4l2: Device, + pix_format: v4l2::v4l2_pix_format, +} +impl CaptStream{ + pub fn next<R>(&self, cb: impl FnOnce(&[u8], BufAttrs)->R) + -> Result<R, IoError>{ + self.v4l2.dequeue(&self.v4l2.io_capture, + v4l2::v4l2_buf_type_V4L2_BUF_TYPE_VIDEO_CAPTURE, cb) + } +} +impl_pix_format_reader!(CaptStream); diff --git a/v4l2-sys/Cargo.toml b/v4l2-sys/Cargo.toml new file mode 100644 index 0000000..22be781 --- /dev/null +++ b/v4l2-sys/Cargo.toml @@ -0,0 +1,27 @@ +[package] +name = "v4l2-sys" +version = "1.1.0" +authors = ["Russel Winder <russel@winder.org.uk>"] +categories = ["api-bindings", "hardware-support", "external-ffi-bindings"] +keywords = ["ffi", "v4l2", "video", "dvb", "sdr"] +license = "LGPL-3.0" +build = "build.rs" +description = """ +Rust FFI binding for the C API of Video for Linux API version 2, V4L2. +""" +repository = "https://gitlab.com/Russel/rust-v4l2-sys" +readme = "README.md" +edition = "2018" + +[dependencies] +libc = "0.2" + +[build-dependencies] +# So as to allow projects to use this crate with soapysdr-sys, the build of this +# crate must use the same bindgen as soapysdr-sys. This is exceedingly silly, +# there should not be such a coupling required by Cargo. +# cf. https://github.com/rust-lang/cargo/issues/5237 +bindgen = "> 0.51" + +[dev-dependencies] +rstest = "0.6.3" diff --git a/v4l2-sys/GPL-3 b/v4l2-sys/GPL-3 new file mode 100644 index 0000000..f288702 --- /dev/null +++ b/v4l2-sys/GPL-3 @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/> + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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+ +use std::env; +use std::path::PathBuf; + +fn main() { + let bindings = bindgen::Builder::default() + .header("wrapper.h") + .generate() + .expect("Unable to generate bindings"); + let out_path = PathBuf::from(env::var("OUT_DIR").unwrap()); + bindings + .write_to_file(out_path.join("bindings.rs")) + .expect("Couldn't write bindings!"); +} diff --git a/v4l2-sys/src/lib.rs b/v4l2-sys/src/lib.rs new file mode 100644 index 0000000..b2579d9 --- /dev/null +++ b/v4l2-sys/src/lib.rs @@ -0,0 +1,148 @@ +#![allow(non_upper_case_globals)] +#![allow(non_camel_case_types)] +#![allow(non_snake_case)] + +use libc::c_ulong; + +include!(concat!(env!("OUT_DIR"), "/bindings.rs")); + +// Bindgen does not handle C preprocessor macro functions, so does not handle any of the symbols +// that depend on _IOC, _IO, _IOR, _IOW, _IOWR, etc. Use constant functions to add them. + +// C preprocessor macros originally from /usr/include/asm-generic/ioctl.h amended to be Rust +// const functions. + +const fn _IOC(dir: u32, type_: char, nr: u32, size: usize) -> c_ulong { + let n = (dir << _IOC_DIRSHIFT) | ((type_ as u32) << _IOC_TYPESHIFT) | (nr << _IOC_NRSHIFT) | ((size as u32) << _IOC_SIZESHIFT); + n as c_ulong +} + +const fn _IO(type_: char, nr: u32) -> c_ulong { _IOC(_IOC_NONE, type_, nr, 0) } +const fn _IOR(type_: char, nr: u32, size: usize) -> c_ulong { _IOC(_IOC_READ, type_, nr, size) } +const fn _IOW(type_: char, nr: u32, size: usize) -> c_ulong { _IOC(_IOC_WRITE, type_, nr, size) } +const fn _IOWR(type_: char, nr: u32, size: usize) -> c_ulong { _IOC(_IOC_READ|_IOC_WRITE, type_, nr, size) } + +// C has a sizeof function, Rust handles this with this const function. + +use std::mem::size_of; + +// The relevant symbols from /usr/include/linux/videodev2.h + +pub const VIDIOC_QUERYCAP:c_ulong = _IOR('V', 0, size_of::<v4l2_capability>()); +pub const VIDIOC_ENUM_FMT:c_ulong = _IOWR('V', 2, size_of::<v4l2_fmtdesc>()); +pub const VIDIOC_G_FMT:c_ulong = _IOWR('V', 4, size_of::<v4l2_format>()); +pub const VIDIOC_S_FMT:c_ulong = _IOWR('V', 5, size_of::<v4l2_format>()); +pub const VIDIOC_REQBUFS:c_ulong = _IOWR('V', 8, size_of::<v4l2_requestbuffers>()); +pub const VIDIOC_QUERYBUF:c_ulong = _IOWR('V', 9, size_of::<v4l2_buffer>()); +pub const VIDIOC_G_FBUF:c_ulong = _IOR('V', 10, size_of::<v4l2_framebuffer>()); +pub const VIDIOC_S_FBUF:c_ulong = _IOW('V', 11, size_of::<v4l2_framebuffer>()); +pub const VIDIOC_OVERLAY:c_ulong = _IOW('V', 14, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_QBUF:c_ulong = _IOWR('V', 15, size_of::<v4l2_buffer>()); +pub const VIDIOC_EXPBUF:c_ulong = _IOWR('V', 16, size_of::<v4l2_exportbuffer>()); +pub const VIDIOC_DQBUF:c_ulong = _IOWR('V', 17, size_of::<v4l2_buffer>()); +pub const VIDIOC_STREAMON:c_ulong = _IOW('V', 18, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_STREAMOFF:c_ulong = _IOW('V', 19, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_G_PARM:c_ulong = _IOWR('V', 21, size_of::<v4l2_streamparm>()); +pub const VIDIOC_S_PARM:c_ulong = _IOWR('V', 22, size_of::<v4l2_streamparm>()); +pub const VIDIOC_G_STD:c_ulong = _IOR('V', 23, size_of::<v4l2_std_id>()); +pub const VIDIOC_S_STD:c_ulong = _IOW('V', 24, size_of::<v4l2_std_id>()); +pub const VIDIOC_ENUMSTD:c_ulong = _IOWR('V', 25, size_of::<v4l2_standard>()); +pub const VIDIOC_ENUMINPUT:c_ulong = _IOWR('V', 26, size_of::<v4l2_input>()); +pub const VIDIOC_G_CTRL:c_ulong = _IOWR('V', 27, size_of::<v4l2_control>()); +pub const VIDIOC_S_CTRL:c_ulong = _IOWR('V', 28, size_of::<v4l2_control>()); +pub const VIDIOC_G_TUNER:c_ulong = _IOWR('V', 29, size_of::<v4l2_tuner>()); +pub const VIDIOC_S_TUNER:c_ulong = _IOW('V', 30, size_of::<v4l2_tuner>()); +pub const VIDIOC_G_AUDIO:c_ulong = _IOR('V', 33, size_of::<v4l2_audio>()); +pub const VIDIOC_S_AUDIO:c_ulong = _IOW('V', 34, size_of::<v4l2_audio>()); +pub const VIDIOC_QUERYCTRL:c_ulong = _IOWR('V', 36, size_of::<v4l2_queryctrl>()); +pub const VIDIOC_QUERYMENU:c_ulong = _IOWR('V', 37, size_of::<v4l2_querymenu>()); +pub const VIDIOC_G_INPUT:c_ulong = _IOR('V', 38, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_S_INPUT:c_ulong = _IOWR('V', 39, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_G_EDID:c_ulong = _IOWR('V', 40, size_of::<v4l2_edid>()); +pub const VIDIOC_S_EDID:c_ulong = _IOWR('V', 41, size_of::<v4l2_edid>()); +pub const VIDIOC_G_OUTPUT:c_ulong = _IOR('V', 46, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_S_OUTPUT:c_ulong = _IOWR('V', 47, size_of::<u32>()); // TODO check C int is Rust u32. +pub const VIDIOC_ENUMOUTPUT:c_ulong = _IOWR('V', 48, size_of::<v4l2_output>()); +pub const VIDIOC_G_AUDOUT:c_ulong = _IOR('V', 49, size_of::<v4l2_audioout>()); +pub const VIDIOC_S_AUDOUT:c_ulong = _IOW('V', 50, size_of::<v4l2_audioout>()); +pub const VIDIOC_G_MODULATOR:c_ulong = _IOWR('V', 54, size_of::<v4l2_modulator>()); +pub const VIDIOC_S_MODULATOR:c_ulong = _IOW('V', 55, size_of::<v4l2_modulator>()); +pub const VIDIOC_G_FREQUENCY:c_ulong = _IOWR('V', 56, size_of::<v4l2_frequency>()); +pub const VIDIOC_S_FREQUENCY:c_ulong = _IOW('V', 57, size_of::<v4l2_frequency>()); +pub const VIDIOC_CROPCAP:c_ulong = _IOWR('V', 58, size_of::<v4l2_cropcap>()); +pub const VIDIOC_G_CROP:c_ulong = _IOWR('V', 59, size_of::<v4l2_crop>()); +pub const VIDIOC_S_CROP:c_ulong = _IOW('V', 60, size_of::<v4l2_crop>()); +pub const VIDIOC_G_JPEGCOMP:c_ulong = _IOR('V', 61, size_of::<v4l2_jpegcompression>()); +pub const VIDIOC_S_JPEGCOMP:c_ulong = _IOW('V', 62, size_of::<v4l2_jpegcompression>()); +pub const VIDIOC_QUERYSTD:c_ulong = _IOR('V', 63, size_of::<v4l2_std_id>()); +pub const VIDIOC_TRY_FMT:c_ulong = _IOWR('V', 64, size_of::<v4l2_format>()); +pub const VIDIOC_ENUMAUDIO:c_ulong = _IOWR('V', 65, size_of::<v4l2_audio>()); +pub const VIDIOC_ENUMAUDOUT:c_ulong = _IOWR('V', 66, size_of::<v4l2_audioout>()); +pub const VIDIOC_G_PRIORITY:c_ulong = _IOR('V', 67, size_of::<u32>()); /* enum v4l2_priority */ +pub const VIDIOC_S_PRIORITY:c_ulong = _IOW('V', 68, size_of::<u32>()); /* enum v4l2_priority */ +pub const VIDIOC_G_SLICED_VBI_CAP:c_ulong = _IOWR('V', 69, size_of::<v4l2_sliced_vbi_cap>()); +pub const VIDIOC_LOG_STATUS:c_ulong = _IO('V', 70); +pub const VIDIOC_G_EXT_CTRLS:c_ulong = _IOWR('V', 71, size_of::<v4l2_ext_controls>()); +pub const VIDIOC_S_EXT_CTRLS:c_ulong = _IOWR('V', 72, size_of::<v4l2_ext_controls>()); +pub const VIDIOC_TRY_EXT_CTRLS:c_ulong = _IOWR('V', 73, size_of::<v4l2_ext_controls>()); +pub const VIDIOC_ENUM_FRAMESIZES:c_ulong = _IOWR('V', 74, size_of::<v4l2_frmsizeenum>()); +pub const VIDIOC_ENUM_FRAMEINTERVALS:c_ulong = _IOWR('V', 75, size_of::<v4l2_frmivalenum>()); +pub const VIDIOC_G_ENC_INDEX:c_ulong = _IOR('V', 76, size_of::<v4l2_enc_idx>()); +pub const VIDIOC_ENCODER_CMD:c_ulong = _IOWR('V', 77, size_of::<v4l2_encoder_cmd>()); +pub const VIDIOC_TRY_ENCODER_CMD:c_ulong = _IOWR('V', 78, size_of::<v4l2_encoder_cmd>()); + +/* + * Experimental, meant for debugging, testing and internal use. + * Only implemented if CONFIG_VIDEO_ADV_DEBUG is defined. + * You must be root to use these ioctls. Never use these in applications! + */ +pub const VIDIOC_DBG_S_REGISTER:c_ulong = _IOW('V', 79, size_of::<v4l2_dbg_register>()); +pub const VIDIOC_DBG_G_REGISTER:c_ulong = _IOWR('V', 80, size_of::<v4l2_dbg_register>()); + +pub const VIDIOC_S_HW_FREQ_SEEK:c_ulong = _IOW('V', 82, size_of::<v4l2_hw_freq_seek>()); +pub const VIDIOC_S_DV_TIMINGS:c_ulong = _IOWR('V', 87, size_of::<v4l2_dv_timings>()); +pub const VIDIOC_G_DV_TIMINGS:c_ulong = _IOWR('V', 88, size_of::<v4l2_dv_timings>()); +pub const VIDIOC_DQEVENT:c_ulong = _IOR('V', 89, size_of::<v4l2_event>()); +pub const VIDIOC_SUBSCRIBE_EVENT:c_ulong = _IOW('V', 90, size_of::<v4l2_event_subscription>()); +pub const VIDIOC_UNSUBSCRIBE_EVENT:c_ulong = _IOW('V', 91, size_of::<v4l2_event_subscription>()); +pub const VIDIOC_CREATE_BUFS:c_ulong = _IOWR('V', 92, size_of::<v4l2_create_buffers>()); +pub const VIDIOC_PREPARE_BUF:c_ulong = _IOWR('V', 93, size_of::<v4l2_buffer>()); +pub const VIDIOC_G_SELECTION:c_ulong = _IOWR('V', 94, size_of::<v4l2_selection>()); +pub const VIDIOC_S_SELECTION:c_ulong = _IOWR('V', 95, size_of::<v4l2_selection>()); +pub const VIDIOC_DECODER_CMD:c_ulong = _IOWR('V', 96, size_of::<v4l2_decoder_cmd>()); +pub const VIDIOC_TRY_DECODER_CMD:c_ulong = _IOWR('V', 97, size_of::<v4l2_decoder_cmd>()); +pub const VIDIOC_ENUM_DV_TIMINGS:c_ulong = _IOWR('V', 98, size_of::<v4l2_enum_dv_timings>()); +pub const VIDIOC_QUERY_DV_TIMINGS:c_ulong = _IOR('V', 99, size_of::<v4l2_dv_timings>()); +pub const VIDIOC_DV_TIMINGS_CAP:c_ulong = _IOWR('V', 100, size_of::<v4l2_dv_timings_cap>()); +pub const VIDIOC_ENUM_FREQ_BANDS:c_ulong = _IOWR('V', 101, size_of::<v4l2_frequency_band>()); + +/* + * Experimental, meant for debugging, testing and internal use. + * Never use this in applications! + */ +pub const VIDIOC_DBG_G_CHIP_INFO:c_ulong = _IOWR('V', 102, size_of::<v4l2_dbg_chip_info>()); + +pub const VIDIOC_QUERY_EXT_CTRL:c_ulong = _IOWR('V', 103, size_of::<v4l2_query_ext_ctrl>()); + +#[cfg(test)] +mod tests { + + use super::*; + + use rstest::rstest; + + // TODO really need to test many more, if not all of the values. + + #[rstest( + datum, expected, + case(VIDIOC_QUERYCAP, 2154321408), + case(VIDIOC_OVERLAY, 1074025998), + case(VIDIOC_G_PRIORITY, 2147767875), + case(VIDIOC_S_PRIORITY, 1074026052), + case(VIDIOC_LOG_STATUS, 22086), + )] + fn check_vidioc_symbol_values(datum: u32, expected: u32) { + assert_eq!(datum, expected); + } + +} diff --git a/v4l2-sys/wrapper.h b/v4l2-sys/wrapper.h new file mode 100644 index 0000000..90a718c --- /dev/null +++ b/v4l2-sys/wrapper.h @@ -0,0 +1 @@ +#include <linux/videodev2.h> |