为 gstreamer crate 0.14 编写 rust/gstreamer 插件需要哪些依赖项？

Question

我正在尝试按照 https://coaxion.net/blog/2018/01/how-to-write-gstreamer-elements-in-rust-part-1-a-video-filter-for-converting-rgb-to-grayscale/ 上关于使用 Rust 编写 gstreamer 插件的教程进行操作。

如果你按照教程到我有可编译代码的第一点 Cargo.toml 是

[package]
name = "gst-plugin-tutorial"
version = "0.1.0"
authors = ["Sebastian DrÃ¶ge <sebastian@centricular.com>"]
repository = "https://github.com/sdroege/gst-plugin-rs"
license = "MIT/Apache-2.0"

[dependencies]
glib = "0.4"
gstreamer = "0.10"
gstreamer-base = "0.10"
gstreamer-video = "0.10"
gst-plugin = "0.1"

[lib]
name = "gstrstutorial"
crate-type = ["cdylib"]
path = "src/lib.rs"

和 src/lib.rs 是

extern crate glib;
#[macro_use]
extern crate gstreamer as gst;
extern crate gstreamer_base as gst_base;
extern crate gstreamer_video as gst_video;
#[macro_use]
extern crate gst_plugin;

plugin_define!(
    b"rstutorial[=12=]",
    b"Rust Tutorial Plugin[=12=]",
    plugin_init,
    b"1.0[=12=]",
    b"MIT/X11[=12=]",
    b"rstutorial[=12=]",
    b"rstutorial[=12=]",
    b"https://github.com/sdroege/gst-plugin-rs[=12=]",
    b"2017-12-30[=12=]"
);

fn plugin_init(plugin: &gst::Plugin) -> bool {
    true
}

这可以编译，但是我需要为其编写插件的项目使用 gstreamer 1.16，因此它需要 rust crate gstreamer 0.14。

当我更改 Cargo.toml 以引用 gstreamer crate 的最新版本时：

[dependencies]
#glib = "0.4"
gstreamer = "0.14"
gstreamer-base = "0.14"
gstreamer-video = "0.14"
gst-plugin = "0.3.2"

我在构建时遇到错误：

    Updating crates.io index
error: failed to select a version for `glib-sys`.
    ... required by package `gstreamer-base v0.14.0`
    ... which is depended on by `gst-plugin-tutorial v0.1.0 (/home/thoth/src/rust-gst-plugin-exp/coaxion-plugin)`
versions that meet the requirements `^0.9` are: 0.9.0

the package `glib-sys` links to the native library `glib`, but it conflicts with a previous package which links to `glib` as well:
package `glib-sys v0.7.0`
    ... which is depended on by `gst-plugin v0.3.2`
    ... which is depended on by `gst-plugin-tutorial v0.1.0 (/home/thoth/src/rust-gst-plugin-exp/coaxion-plugin)`

failed to select a version for `glib-sys` which could resolve this conflict

在 rust 中编写与 gstreamer 1.16 一起使用的 gstreamer 插件的 crate 版本的正确组合是什么？

Answer 1

您可以找到教程的新版本 here and the latest version of the code here。

您的问题是您仍在使用 gst-plugin 板条箱，但现在已经过时了，所有内容都是 glib / gstreamer / gstreamer-base / 等等如果您启用它们的 subclass 功能，现在会生成板条箱。有关详细信息，请参阅上面的链接。

根据旧版本的 gst-plugin crate 将引入旧版本的 glib-sys （和其他）crate，并且你不能有两个不同版本的 -sys 同一个项目中的箱子。

如果取消注释 glib 依赖项，您将再次遇到同样的问题。将其更新为 glib 的 0.8 版本后，该错误也会消失。

Answer 2

作为塞巴斯蒂安答案的变体，我试验了一个 Cargo.toml 不指向 git 并使用已发布的板条箱。

glib = "0.8"
gstreamer = "0.14"
gstreamer-base = "0.14"
gstreamer-video = "0.14"
#gst-plugin = "0.3.2"

未能提供 gst_plugin_define! 的定义。这似乎是子类化功能的一部分。切换到以下依赖项：

glib = { version = "0.8", features = [ "subclassing"] }
gstreamer = { version = "0.14", features = [ "subclassing"] }
gstreamer-base = { version = "0.14", features = [ "subclassing"] }
gstreamer-video = "0.14"

激活了定义 gst_plugin_define! 宏的代码。

为 gstreamer crate 0.14 编写 rust/gstreamer 插件需要哪些依赖项？

What dependencies are needed to write rust/gstreamer plugins for gstreamer crate 0.14?

gstreamer

rust