From 9de58a4c7514e328299f1836df9ed1b35a0bb0b5 Mon Sep 17 00:00:00 2001
From: FliegendeWurst <2012gdwu@web.de>
Date: Tue, 12 May 2020 21:35:33 +0200
Subject: [PATCH] Initial commit

---
 .gitignore  |   1 +
 Cargo.lock  | 692 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  12 +
 src/main.rs |  61 +++++
 4 files changed, 766 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eb5a316
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+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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+checksum = "002351e428db1eb1d8656d4ca61947c3519ac3191e1c804d4600cd32093b77ad"
+dependencies = [
+ "byteorder",
+ "lzw",
+ "miniz_oxide",
+]
+
+[[package]]
+name = "time"
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+checksum = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
+dependencies = [
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "unicode-width"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+[[package]]
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+[[package]]
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+checksum = "9c036e3f99618ab6e60ef41b5bf468df33bd17037a5f6ef0723acd4129f74804"
+dependencies = [
+ "libc",
+ "v4l-sys",
+]
+
+[[package]]
+name = "v4l-save-image"
+version = "0.1.0"
+dependencies = [
+ "chrono",
+ "image",
+ "v4l",
+]
+
+[[package]]
+name = "v4l-sys"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "013d41269ff44c1e9d8b44de49f2482b24d308a385dfeee3627506a5f6f5a589"
+dependencies = [
+ "bindgen",
+]
+
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
+[[package]]
+name = "version_check"
+version = "0.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
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+[[package]]
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+checksum = "d011071ae14a2f6671d0b74080ae0cd8ebf3a6f8c9589a2cd45f23126fe29724"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..261f40b
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "v4l-save-image"
+version = "0.1.0"
+authors = ["FliegendeWurst <2012gdwu@web.de>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+v4l = "0.4.0"
+image = "0.23.4"
+chrono = "0.4.11"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..05dc134
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,61 @@
+use chrono::{Datelike, Local, Timelike};
+use image::{ImageBuffer, Rgb};
+use v4l::{Buffer, CaptureDevice, CaptureFormat, FourCC, MappedBufferStream};
+
+use std::time::Instant;
+
+fn main() {
+    // Determine which device to use
+    let path: String = "/dev/video0".to_owned();
+    println!("Using device: {}\n", path);
+
+    let count = 1;
+
+    // Allocate 4 buffers by default
+    let buffers = 4;
+
+    let mut dev = CaptureDevice::with_path(path).expect("Failed to open device");
+    println!("{:?}", dev.enumerate_formats());
+    println!("{:?}", dev.set_format(&CaptureFormat::new(640, 480, FourCC::new(b"RGB3"))));
+    let params = dev.get_params().expect("Failed to get parameters");
+    println!("Active format:\n{}", dev.get_format().unwrap());
+    println!("Active parameters:\n{}", params);
+
+    // Setup a buffer stream and grab a frame, then print its data
+    let mut stream = MappedBufferStream::with_buffers(&mut dev, buffers)
+        .expect("Failed to create buffer stream");
+
+    // warmup
+    stream.next().expect("Failed to capture buffer");
+
+    let start = Instant::now();
+    let mut megabytes_ps: f64 = 0.0;
+    for i in 0..count {
+        let t0 = Instant::now();
+        let buf = stream.next().expect("Failed to capture buffer");
+        let duration_us = t0.elapsed().as_micros();
+
+        let cur = buf.len() as f64 / 1_048_576.0 * 1_000_000.0 / duration_us as f64;
+        if i == 0 {
+            megabytes_ps = cur;
+        } else {
+            // ignore the first measurement
+            let prev = megabytes_ps * (i as f64 / (i + 1) as f64);
+            let now = cur * (1.0 / (i + 1) as f64);
+            megabytes_ps = prev + now;
+        }
+
+        println!("Buffer");
+        println!("  sequence  : {}", buf.seq());
+        println!("  timestamp : {}", buf.timestamp());
+        println!("  flags     : {}", buf.flags());
+        println!("  length    : {}", buf.len());
+        let now = Local::now();
+        let img: ImageBuffer<Rgb<u8>, _> = ImageBuffer::from_vec(640, 480, buf.data().to_vec()).unwrap();
+        img.save(format!("image_{}-{:02}-{:02}_{:02}-{:02}-{:02}.jpg", now.year(), now.month(), now.day(), now.hour(), now.minute(), now.second())).unwrap();
+    }
+
+    println!();
+    println!("FPS: {}", count as f64 / start.elapsed().as_secs_f64());
+    println!("MB/s: {}", megabytes_ps);
+}