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main ... drop-b-fra

Author SHA1 Message Date
Rafael Caricio
e77d7ec628
Drop and put back b-frames 2022-09-29 18:43:58 +02:00
4 changed files with 428 additions and 267 deletions
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1
.gitignore vendored
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@ -1 +1,2 @@
/target /target
/out

414
Cargo.lock generated
View file

@ -3,25 +3,22 @@
version = 3 version = 3
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checksum = "0744126afe1a6dd7f394cb50a716dbe086cb06e255e53d8d0185d82828358fb5" checksum = "b1de2e551fb905ac83f73f7aedf2f0cb4a0da7e35efa24a202a936269f1f18e1"
[[package]] [[package]]
name = "pin-project-lite" name = "pin-project-lite"
version = "0.2.7" version = "0.2.9"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8d31d11c69a6b52a174b42bdc0c30e5e11670f90788b2c471c31c1d17d449443" checksum = "e0a7ae3ac2f1173085d398531c705756c94a4c56843785df85a60c1a0afac116"
[[package]] [[package]]
name = "pin-utils" name = "pin-utils"
@ -426,22 +368,29 @@ checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
[[package]] [[package]]
name = "pkg-config" name = "pkg-config"
version = "0.3.22" version = "0.3.25"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "12295df4f294471248581bc09bef3c38a5e46f1e36d6a37353621a0c6c357e1f" checksum = "1df8c4ec4b0627e53bdf214615ad287367e482558cf84b109250b37464dc03ae"
[[package]]
name = "ppv-lite86"
version = "0.2.16"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
[[package]] [[package]]
name = "pretty-hex" name = "pretty-hex"
version = "0.2.1" version = "0.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bc5c99d529f0d30937f6f4b8a86d988047327bb88d04d2c4afc356de74722131" checksum = "c6fa0831dd7cc608c38a5e323422a0077678fa5744aa2be4ad91c4ece8eec8d5"
[[package]] [[package]]
name = "proc-macro-crate" name = "proc-macro-crate"
version = "1.1.0" version = "1.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ebace6889caf889b4d3f76becee12e90353f2b8c7d875534a71e5742f8f6f83" checksum = "eda0fc3b0fb7c975631757e14d9049da17374063edb6ebbcbc54d880d4fe94e9"
dependencies = [ dependencies = [
"once_cell",
"thiserror", "thiserror",
"toml", "toml",
] ]
@ -472,82 +421,100 @@ dependencies = [
[[package]] [[package]]
name = "proc-macro2" name = "proc-macro2"
version = "1.0.33" version = "1.0.46"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "fb37d2df5df740e582f28f8560cf425f52bb267d872fe58358eadb554909f07a" checksum = "94e2ef8dbfc347b10c094890f778ee2e36ca9bb4262e86dc99cd217e35f3470b"
dependencies = [ dependencies = [
"unicode-xid", "unicode-ident",
] ]
[[package]] [[package]]
name = "quote" name = "quote"
version = "1.0.10" version = "1.0.21"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "38bc8cc6a5f2e3655e0899c1b848643b2562f853f114bfec7be120678e3ace05" checksum = "bbe448f377a7d6961e30f5955f9b8d106c3f5e449d493ee1b125c1d43c2b5179"
dependencies = [ dependencies = [
"proc-macro2", "proc-macro2",
] ]
[[package]] [[package]]
name = "regex" name = "rand"
version = "1.5.4" version = "0.8.5"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461" checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
dependencies = [ dependencies = [
"aho-corasick", "libc",
"memchr", "rand_chacha",
"regex-syntax", "rand_core",
] ]
[[package]] [[package]]
name = "regex-syntax" name = "rand_chacha"
version = "0.6.25" version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b" checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
dependencies = [
"ppv-lite86",
"rand_core",
]
[[package]]
name = "rand_core"
version = "0.6.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
dependencies = [
"getrandom",
]
[[package]] [[package]]
name = "serde" name = "serde"
version = "1.0.130" version = "1.0.145"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f12d06de37cf59146fbdecab66aa99f9fe4f78722e3607577a5375d66bd0c913" checksum = "728eb6351430bccb993660dfffc5a72f91ccc1295abaa8ce19b27ebe4f75568b"
[[package]] [[package]]
name = "slab" name = "slab"
version = "0.4.5" version = "0.4.7"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9def91fd1e018fe007022791f865d0ccc9b3a0d5001e01aabb8b40e46000afb5" checksum = "4614a76b2a8be0058caa9dbbaf66d988527d86d003c11a94fbd335d7661edcef"
dependencies = [
"autocfg",
]
[[package]] [[package]]
name = "slim-live" name = "slim-live"
version = "0.1.0" version = "0.1.0"
dependencies = [ dependencies = [
"anyhow", "anyhow",
"gst-plugin-hlssink3",
"gstreamer", "gstreamer",
"gstreamer-app",
"gstreamer-video",
"ulid",
] ]
[[package]] [[package]]
name = "smallvec" name = "smallvec"
version = "1.7.0" version = "1.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309" checksum = "2fd0db749597d91ff862fd1d55ea87f7855a744a8425a64695b6fca237d1dad1"
[[package]] [[package]]
name = "syn" name = "syn"
version = "1.0.82" version = "1.0.101"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8daf5dd0bb60cbd4137b1b587d2fc0ae729bc07cf01cd70b36a1ed5ade3b9d59" checksum = "e90cde112c4b9690b8cbe810cba9ddd8bc1d7472e2cae317b69e9438c1cba7d2"
dependencies = [ dependencies = [
"proc-macro2", "proc-macro2",
"quote", "quote",
"unicode-xid", "unicode-ident",
] ]
[[package]] [[package]]
name = "system-deps" name = "system-deps"
version = "6.0.0" version = "6.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7b1487aaddaacbc5d60a2a507ba1617c5ca66c57dd0dd07d0c5efd5b693841d4" checksum = "a1a45a1c4c9015217e12347f2a411b57ce2c4fc543913b14b6fe40483328e709"
dependencies = [ dependencies = [
"cfg-expr", "cfg-expr",
"heck", "heck",
@ -558,18 +525,18 @@ dependencies = [
[[package]] [[package]]
name = "thiserror" name = "thiserror"
version = "1.0.30" version = "1.0.37"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "854babe52e4df1653706b98fcfc05843010039b406875930a70e4d9644e5c417" checksum = "10deb33631e3c9018b9baf9dcbbc4f737320d2b576bac10f6aefa048fa407e3e"
dependencies = [ dependencies = [
"thiserror-impl", "thiserror-impl",
] ]
[[package]] [[package]]
name = "thiserror-impl" name = "thiserror-impl"
version = "1.0.30" version = "1.0.37"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aa32fd3f627f367fe16f893e2597ae3c05020f8bba2666a4e6ea73d377e5714b" checksum = "982d17546b47146b28f7c22e3d08465f6b8903d0ea13c1660d9d84a6e7adcdbb"
dependencies = [ dependencies = [
"proc-macro2", "proc-macro2",
"quote", "quote",
@ -578,24 +545,27 @@ dependencies = [
[[package]] [[package]]
name = "toml" name = "toml"
version = "0.5.8" version = "0.5.9"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a31142970826733df8241ef35dc040ef98c679ab14d7c3e54d827099b3acecaa" checksum = "8d82e1a7758622a465f8cee077614c73484dac5b836c02ff6a40d5d1010324d7"
dependencies = [ dependencies = [
"serde", "serde",
] ]
[[package]] [[package]]
name = "unicode-segmentation" name = "ulid"
version = "1.8.0" version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b" checksum = "13a3aaa69b04e5b66cc27309710a569ea23593612387d67daaf102e73aa974fd"
dependencies = [
"rand",
]
[[package]] [[package]]
name = "unicode-xid" name = "unicode-ident"
version = "0.2.2" version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3" checksum = "dcc811dc4066ac62f84f11307873c4850cb653bfa9b1719cee2bd2204a4bc5dd"
[[package]] [[package]]
name = "version-compare" name = "version-compare"
@ -605,28 +575,12 @@ checksum = "fe88247b92c1df6b6de80ddc290f3976dbdf2f5f5d3fd049a9fb598c6dd5ca73"
[[package]] [[package]]
name = "version_check" name = "version_check"
version = "0.9.3" version = "0.9.4"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5fecdca9a5291cc2b8dcf7dc02453fee791a280f3743cb0905f8822ae463b3fe" checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
[[package]] [[package]]
name = "winapi" name = "wasi"
version = "0.3.9" version = "0.11.0+wasi-snapshot-preview1"
source = "registry+https://github.com/rust-lang/crates.io-index" source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419" checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
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-x86_64-pc-windows-gnu"
version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

6
Cargo.toml
View file

@ -9,6 +9,8 @@ edition = "2021"
rust-version = "1.56" rust-version = "1.56"
[dependencies] [dependencies]
gst = { package = "gstreamer", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", features = ["v1_18"] } gst = { package = "gstreamer", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs", features = ["v1_20"] }
gst-plugin-hlssink3 = { package = "gst-plugin-hlssink3", git = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs" } # path = "../gst-plugins-rs/net/hlssink3" } gst-video = { package = "gstreamer-video", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
gst-app = { package = "gstreamer-app", git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
anyhow = "1.0.51" anyhow = "1.0.51"
ulid = "1"

274
src/main.rs
View file

@ -1,48 +1,252 @@
use gst::prelude::*;
use anyhow::Error; use anyhow::Error;
use gst::{Buffer, FlowError, FlowSuccess, glib};
use gst::meta::CustomMeta;
use gst::prelude::*;
use std::collections::{HashMap, VecDeque};
use std::sync::{Arc, Mutex};
fn main() -> Result<(), Error> { static IDENTITY_META: &str = "IdentityMeta";
static BUFFERS_AHEAD_META: &str = "BuffersAheadMeta";
trait UidSetter {
fn set_uid(&mut self, id: String);
}
trait UidGetter {
fn uid(&self) -> Option<String>;
}
impl UidSetter for &mut gst::BufferRef {
fn set_uid(&mut self, id: String) {
let mut meta = gst::meta::CustomMeta::add(self, IDENTITY_META).unwrap();
let s = meta.mut_structure();
s.set("id", id);
}
}
impl UidGetter for &gst::BufferRef {
fn uid(&self) -> Option<String> {
let meta = match CustomMeta::from_buffer(self, IDENTITY_META) {
Ok(m) => m,
Err(_) => return None,
};
let s = meta.structure();
s.get::<String>("id").ok()
}
}
trait BuffersAheadSetter {
fn set_buffers_ahead(&mut self, buffers: Vec<gst::Buffer>);
}
trait BuffersAheadGetter {
fn buffers_ahead(&self) -> Option<Vec<gst::Buffer>>;
}
impl BuffersAheadSetter for &mut gst::BufferRef {
fn set_buffers_ahead(&mut self, buffers: Vec<gst::Buffer>) {
let mut meta = gst::meta::CustomMeta::add(self, BUFFERS_AHEAD_META).unwrap();
let s = meta.mut_structure();
s.set("buffers", gst::Array::new(buffers));
}
}
impl BuffersAheadGetter for &gst::BufferRef {
fn buffers_ahead(&self) -> Option<Vec<gst::Buffer>> {
let meta = match CustomMeta::from_buffer(self, BUFFERS_AHEAD_META) {
Ok(m) => m,
Err(_) => return None,
};
let s = meta.structure();
if let Ok(buffers) = s.get::<gst::Array>("buffers") {
// println!("\n\t------Found the list\n");
//let v = buffers.to_vec().map(|v| v.get_owned::<gst::Buffer>().unwrap()).collect::<Vec<_>>();
let mut res = Vec::new();
for buffer in buffers.iter() {
let b = buffer.to_value().get_owned::<gst::Buffer>().unwrap();
res.push(b);
}
Some(res)
} else {
None
}
}
}
fn main() -> Result<(), Error> {
gst::init()?; gst::init()?;
gst_plugin_hlssink3::plugin_register_static()?;
let pipeline = gst::parse_launch("videotestsrc num-buffers=2500 ! timecodestamper ! video/x-raw,format=I420,width=1280,height=720,framerate=30/1 ! timeoverlay ! x264enc bframes=0 bitrate=2048 key-int-max=180 option-string=scenecut=0:force-cfr=1 ! video/x-h264,stream-format=avc,alignment=au,profile=main ! h264parse ! tee name=t ! queue ! hlssink3 name=hls-output t. ! queue ! fakesink sync=true").unwrap().downcast::<gst::Pipeline>().unwrap(); let pipeline = gst::parse_launch(r#"
let hls_output = pipeline.by_name("hls-output").unwrap();
hls_output.set_properties(&[ srtsrc uri=srt://127.0.0.1:7002 ! tsdemux ! h264parse update-timecode=true name=parser ! tee name=t
("playlist-type", &"vod"),
("location", &"s%05d.ts"), t. ! queue ! avdec_h264 ! appsink name=picture-type-setter
("playlist-location", &"master.m3u8"), t. ! queue name=drop-b-frames ! identity name=include-back-b-frame-buffers ! avdec_h264 ! videoconvert ! timeoverlay ! gtksink
("target-duration", &6u32),
]); "#,)?.downcast::<gst::Pipeline>().unwrap();
/*
t. ! queue name=drop-b-frames ! transcriberbin name=trans cc-caps=closedcaption/x-cea-708,format=cc_data
trans.src_video ! queue name=include-back-b-frame-buffers ! avdec_h264 ! videoconvert ! timeoverlay ! cea608overlay black-background=1 ! gtksink
trans.src_audio ! audioconvert ! audiorate ! audioresample ! autoaudiosink
*/
gst::meta::CustomMeta::register(IDENTITY_META, &[]);
gst::meta::CustomMeta::register(BUFFERS_AHEAD_META, &[]);
let id_gen_shared = Arc::new(Mutex::new(ulid::Generator::new()));
let buffer_type_store = Arc::new(Mutex::new(HashMap::new()));
let last_dropped_buffers = Arc::new(Mutex::new(Vec::new()));
let parser = pipeline.by_name("parser").unwrap();
parser
.static_pad("src")
.unwrap()
.add_probe(gst::PadProbeType::BUFFER, {
let id_gen_shared = id_gen_shared.clone();
move |_pad, probe_info| {
if let Some(gst::PadProbeData::Buffer(ref mut buffer)) = probe_info.data {
let mut id_gen = id_gen_shared.lock().unwrap();
let mut buffer = buffer.get_mut().unwrap();
buffer.set_uid(id_gen.generate().unwrap().to_string());
}
gst::PadProbeReturn::Ok
}
});
let picture_type_setter = pipeline
.by_name("picture-type-setter")
.unwrap()
.downcast::<gst_app::AppSink>()
.unwrap();
picture_type_setter.set_callbacks(
gst_app::AppSinkCallbacks::builder()
// Add a handler to the "new-sample" signal.
.new_sample({
let buffer_type_store = buffer_type_store.clone();
move |appsink| {
// Pull the sample in question out of the appsink's buffer.
let sample = appsink.pull_sample().map_err(|_| gst::FlowError::Eos)?;
let buffer = sample.buffer().ok_or(gst::FlowError::Error)?;
// Pull FFMpeg picture information
let picture_type = {
let ffmpeg_meta = CustomMeta::from_buffer(buffer, "GstFFMpegPictureMeta")
.map_err(|_| {
eprintln!("Buffer does not contain FFMpeg meta information, you need to use a modified version of GStreamer");
gst::FlowError::Eos
})?;
let s = ffmpeg_meta.structure();
s.get::<String>("picture-type").map_err(|_| gst::FlowError::Eos)?
};
let buffer_id = buffer.uid().ok_or_else(|| {
eprintln!("Buffer does not contain Identity meta information");
gst::FlowError::Eos
})?;
let mut type_store = buffer_type_store.lock().unwrap();
type_store.insert(buffer_id, picture_type);
Ok(gst::FlowSuccess::Ok)
}
})
.build(),
);
let drop_b_frames_queue = pipeline.by_name("drop-b-frames").unwrap();
let queue_srcpad = drop_b_frames_queue.static_pad("src").unwrap();
queue_srcpad.set_offset(gst::ClockTime::from_mseconds(500).nseconds() as i64);
queue_srcpad.add_probe(gst::PadProbeType::BUFFER, {
let buffer_type_store = buffer_type_store.clone();
let last_dropped_buffers = last_dropped_buffers.clone();
move |_pad, probe_info| {
if let Some(gst::PadProbeData::Buffer(ref mut buffer)) = probe_info.data {
let buffer_id = buffer.as_ref().uid().expect("Buffer UID available");
let type_store = buffer_type_store.lock().unwrap();
let mut last_dropped_buffers = last_dropped_buffers.lock().unwrap();
if let Some(pic_type) = type_store.get(&buffer_id) {
if pic_type == "B" {
// Drop B-frame buffers, but save it to cache for later lookup
last_dropped_buffers.push( buffer.to_owned());
println!("Dropped buffer {buffer_id}");
return gst::PadProbeReturn::Drop;
} else if last_dropped_buffers.len() > 0 {
println!("Found some dropped buffers ahead of {buffer_id}: {:?}", last_dropped_buffers.iter().map(|b| b.as_ref().uid()).collect::<Vec<_>>());
// it is the first non-B-frame buffer since we last dropped
let mut buffer = buffer.get_mut().unwrap();
buffer.set_buffers_ahead(last_dropped_buffers.to_owned());
*last_dropped_buffers = Vec::new();
}
} else {
// The first buffer does not have picture type available, but next ones should have it
println!("Buffer with id({buffer_id}) does not have picture type information");
}
}
gst::PadProbeReturn::Ok
}
});
let reconstruct = pipeline.by_name("include-back-b-frame-buffers").unwrap();
reconstruct
.static_pad("src")
.unwrap()
.add_probe(gst::PadProbeType::BUFFER, |pad, probe_info| {
if let Some(gst::PadProbeData::Buffer(ref buffer)) = probe_info.data {
let mut reconstructed = VecDeque::new();
for buffer_ahead in buffer.as_ref().buffers_ahead().unwrap_or_else(|| Vec::new()) {
let buffer_id = buffer_ahead.as_ref().uid().unwrap();
pad.push(buffer_ahead).expect(format!("Could not push buffer: {buffer_id}").as_str());
reconstructed.push_front(buffer_id);
}
reconstructed.push_front(buffer.as_ref().uid().unwrap());
println!("Reconstructed buffer line: {:?}", reconstructed);
}
gst::PadProbeReturn::Ok
});
pipeline.set_state(gst::State::Playing)?; pipeline.set_state(gst::State::Playing)?;
let bus = pipeline let context = glib::MainContext::default();
.bus() let main_loop = glib::MainLoop::new(Some(&context), false);
.expect("Pipeline without bus. Shouldn't happen!");
for msg in bus.iter_timed(gst::ClockTime::NONE) { pipeline.set_state(gst::State::Playing)?;
use gst::MessageView;
match msg.view() { let bus = pipeline.bus().unwrap();
MessageView::Eos(..) => { bus.add_watch({
println!("EOS"); let main_loop = main_loop.clone();
break; move |_, msg| {
} use gst::MessageView;
MessageView::Error(err) => { let main_loop = &main_loop;
pipeline.set_state(gst::State::Null)?; match msg.view() {
eprintln!( MessageView::Eos(..) => main_loop.quit(),
"Got error from {}: {} ({})", MessageView::Error(err) => {
msg.src() println!(
.map(|s| String::from(s.path_string())) "Error from {:?}: {} ({:?})",
.unwrap_or_else(|| "None".into()), err.src().map(|s| s.path_string()),
err.error(), err.error(),
err.debug().unwrap_or_else(|| "".into()), err.debug()
); );
break; main_loop.quit();
} }
_ => {}, _ => (),
};
glib::Continue(true)
} }
} })
.expect("Failed to add bus watch");
main_loop.run();
pipeline.set_state(gst::State::Null)?;
bus.remove_watch().unwrap();
pipeline.set_state(gst::State::Null)?; pipeline.set_state(gst::State::Null)?;