gst-plugins-rs/mux/fmp4/examples/hls_vod.rs

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// Copyright (C) 2022 Mathieu Duponchelle <mathieu@centricular.com>
//
// This Source Code Form is subject to the terms of the Mozilla Public License, v2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at
// <https://mozilla.org/MPL/2.0/>.
//
// SPDX-License-Identifier: MPL-2.0
// This creates a 10 second VOD HLS stream with one video playlist and two audio
// playlists. Each segment is 2.5 second long.
use gst::prelude::*;
use std::path::{Path, PathBuf};
use std::sync::{Arc, Mutex};
use anyhow::Error;
use m3u8_rs::{
AlternativeMedia, AlternativeMediaType, MasterPlaylist, MediaPlaylist, MediaPlaylistType,
MediaSegment, VariantStream,
};
struct Segment {
duration: gst::ClockTime,
path: String,
}
struct StreamState {
path: PathBuf,
segments: Vec<Segment>,
}
struct VideoStream {
name: String,
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bitrate: u64,
width: u64,
height: u64,
}
struct AudioStream {
name: String,
lang: String,
default: bool,
wave: String,
}
struct State {
video_streams: Vec<VideoStream>,
audio_streams: Vec<AudioStream>,
all_mimes: Vec<String>,
path: PathBuf,
wrote_manifest: bool,
}
impl State {
fn maybe_write_manifest(&mut self) {
if self.wrote_manifest {
return;
}
if self.all_mimes.len() < self.video_streams.len() + self.audio_streams.len() {
return;
}
let mut all_mimes = self.all_mimes.clone();
all_mimes.sort();
all_mimes.dedup();
let playlist = MasterPlaylist {
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version: Some(7),
variants: self
.video_streams
.iter()
.map(|stream| {
let mut path = PathBuf::new();
path.push(&stream.name);
path.push("manifest.m3u8");
VariantStream {
uri: path.as_path().display().to_string(),
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bandwidth: stream.bitrate,
codecs: Some(all_mimes.join(",")),
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resolution: Some(m3u8_rs::Resolution {
width: stream.width,
height: stream.height,
}),
audio: Some("audio".to_string()),
..Default::default()
}
})
.collect(),
alternatives: self
.audio_streams
.iter()
.map(|stream| {
let mut path = PathBuf::new();
path.push(&stream.name);
path.push("manifest.m3u8");
AlternativeMedia {
media_type: AlternativeMediaType::Audio,
uri: Some(path.as_path().display().to_string()),
group_id: "audio".to_string(),
language: Some(stream.lang.clone()),
name: stream.name.clone(),
default: stream.default,
autoselect: stream.default,
channels: Some("2".to_string()),
..Default::default()
}
})
.collect(),
independent_segments: true,
..Default::default()
};
println!("Writing master manifest to {}", self.path.display());
let mut file = std::fs::File::create(&self.path).unwrap();
playlist
.write_to(&mut file)
.expect("Failed to write master playlist");
self.wrote_manifest = true;
}
}
fn setup_appsink(appsink: &gst_app::AppSink, name: &str, path: &Path, is_video: bool) {
let mut path: PathBuf = path.into();
path.push(name);
let state = Arc::new(Mutex::new(StreamState {
segments: Vec::new(),
path,
}));
let state_clone = state.clone();
appsink.set_callbacks(
gst_app::AppSinkCallbacks::builder()
.new_sample(move |sink| {
let sample = sink.pull_sample().map_err(|_| gst::FlowError::Eos)?;
let mut state = state.lock().unwrap();
// The muxer only outputs non-empty buffer lists
let mut buffer_list = sample.buffer_list_owned().expect("no buffer list");
assert!(!buffer_list.is_empty());
let mut first = buffer_list.get(0).unwrap();
// Each list contains a full segment, i.e. does not start with a DELTA_UNIT
assert!(!first.flags().contains(gst::BufferFlags::DELTA_UNIT));
// If the buffer has the DISCONT and HEADER flag set then it contains the media
// header, i.e. the `ftyp`, `moov` and other media boxes.
//
// This might be the initial header or the updated header at the end of the stream.
if first
.flags()
.contains(gst::BufferFlags::DISCONT | gst::BufferFlags::HEADER)
{
let mut path = state.path.clone();
std::fs::create_dir_all(&path).expect("failed to create directory");
path.push("init.cmfi");
println!("writing header to {}", path.display());
let map = first.map_readable().unwrap();
std::fs::write(path, &map).expect("failed to write header");
drop(map);
// Remove the header from the buffer list
buffer_list.make_mut().remove(0, 1);
// If the list is now empty then it only contained the media header and nothing
// else.
if buffer_list.is_empty() {
return Ok(gst::FlowSuccess::Ok);
}
// Otherwise get the next buffer and continue working with that.
first = buffer_list.get(0).unwrap();
}
// If the buffer only has the HEADER flag set then this is a segment header that is
// followed by one or more actual media buffers.
assert!(first.flags().contains(gst::BufferFlags::HEADER));
let mut path = state.path.clone();
let basename = format!(
"segment_{}.{}",
state.segments.len() + 1,
if is_video { "cmfv" } else { "cmfa" }
);
path.push(&basename);
println!("writing segment to {}", path.display());
let duration = first.duration().unwrap();
let mut file = std::fs::File::create(path).expect("failed to open fragment");
for buffer in &*buffer_list {
use std::io::prelude::*;
let map = buffer.map_readable().unwrap();
file.write_all(&map).expect("failed to write fragment");
}
state.segments.push(Segment {
duration,
path: basename.to_string(),
});
Ok(gst::FlowSuccess::Ok)
})
.eos(move |_sink| {
let state = state_clone.lock().unwrap();
// Now write the manifest
let mut path = state.path.clone();
path.push("manifest.m3u8");
println!("writing manifest to {}", path.display());
let playlist = MediaPlaylist {
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version: Some(7),
target_duration: 2.5,
media_sequence: 0,
segments: state
.segments
.iter()
.map(|segment| MediaSegment {
uri: segment.path.to_string(),
duration: (segment.duration.nseconds() as f64
/ gst::ClockTime::SECOND.nseconds() as f64)
as f32,
map: Some(m3u8_rs::Map {
uri: "init.cmfi".into(),
..Default::default()
}),
..Default::default()
})
.collect(),
end_list: true,
playlist_type: Some(MediaPlaylistType::Vod),
i_frames_only: false,
start: None,
independent_segments: true,
..Default::default()
};
let mut file = std::fs::File::create(path).unwrap();
playlist
.write_to(&mut file)
.expect("Failed to write media playlist");
})
.build(),
);
}
fn probe_encoder(state: Arc<Mutex<State>>, enc: gst::Element) {
enc.static_pad("src").unwrap().add_probe(
gst::PadProbeType::EVENT_DOWNSTREAM,
move |_pad, info| match info.data {
Some(gst::PadProbeData::Event(ref ev)) => match ev.view() {
gst::EventView::Caps(e) => {
let mime = gst_pbutils::codec_utils_caps_get_mime_codec(e.caps());
let mut state = state.lock().unwrap();
state.all_mimes.push(mime.unwrap().into());
state.maybe_write_manifest();
gst::PadProbeReturn::Remove
}
_ => gst::PadProbeReturn::Ok,
},
_ => gst::PadProbeReturn::Ok,
},
);
}
impl VideoStream {
fn setup(
&self,
state: Arc<Mutex<State>>,
pipeline: &gst::Pipeline,
path: &Path,
) -> Result<(), Error> {
let src = gst::ElementFactory::make("videotestsrc")
.property("num-buffers", 300)
.build()?;
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let raw_capsfilter = gst::ElementFactory::make("capsfilter")
.property(
"caps",
gst_video::VideoCapsBuilder::new()
.format(gst_video::VideoFormat::I420)
.width(self.width as i32)
.height(self.height as i32)
.framerate(30.into())
.build(),
)
.build()?;
let timeoverlay = gst::ElementFactory::make("timeoverlay").build()?;
let enc = gst::ElementFactory::make("x264enc")
.property("bframes", 0u32)
.property("bitrate", self.bitrate as u32 / 1000u32)
.build()?;
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let h264_capsfilter = gst::ElementFactory::make("capsfilter")
.property(
"caps",
gst::Caps::builder("video/x-h264")
.field("profile", "main")
.build(),
)
.build()?;
let mux = gst::ElementFactory::make("cmafmux")
.property("fragment-duration", 2500.mseconds())
.property_from_str("header-update-mode", "update")
.property("write-mehd", true)
.build()?;
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let appsink = gst_app::AppSink::builder().buffer_list(true).build();
pipeline.add_many(&[
&src,
&raw_capsfilter,
&timeoverlay,
&enc,
&h264_capsfilter,
&mux,
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appsink.upcast_ref(),
])?;
gst::Element::link_many(&[
&src,
&raw_capsfilter,
&timeoverlay,
&enc,
&h264_capsfilter,
&mux,
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appsink.upcast_ref(),
])?;
probe_encoder(state, enc);
setup_appsink(&appsink, &self.name, path, true);
Ok(())
}
}
impl AudioStream {
fn setup(
&self,
state: Arc<Mutex<State>>,
pipeline: &gst::Pipeline,
path: &Path,
) -> Result<(), Error> {
let src = gst::ElementFactory::make("audiotestsrc")
.property("num-buffers", 100)
.property("samplesperbuffer", 4410)
.property_from_str("wave", &self.wave)
.build()?;
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let raw_capsfilter = gst::ElementFactory::make("capsfilter")
.property(
"caps",
gst_audio::AudioCapsBuilder::new().rate(44100).build(),
)
.build()?;
let enc = gst::ElementFactory::make("avenc_aac").build()?;
let mux = gst::ElementFactory::make("cmafmux")
.property("fragment-duration", 2500.mseconds())
.property_from_str("header-update-mode", "update")
.property("write-mehd", true)
.build()?;
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let appsink = gst_app::AppSink::builder().buffer_list(true).build();
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pipeline.add_many(&[&src, &raw_capsfilter, &enc, &mux, appsink.upcast_ref()])?;
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gst::Element::link_many(&[&src, &raw_capsfilter, &enc, &mux, appsink.upcast_ref()])?;
probe_encoder(state, enc);
setup_appsink(&appsink, &self.name, path, false);
Ok(())
}
}
fn main() -> Result<(), Error> {
gst::init()?;
gstfmp4::plugin_register_static()?;
let path = PathBuf::from("hls_vod_stream");
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let pipeline = gst::Pipeline::default();
std::fs::create_dir_all(&path).expect("failed to create directory");
let mut manifest_path = path.clone();
manifest_path.push("manifest.m3u8");
let state = Arc::new(Mutex::new(State {
video_streams: vec![VideoStream {
name: "video_0".to_string(),
bitrate: 2_048_000,
width: 1280,
height: 720,
}],
audio_streams: vec![
AudioStream {
name: "audio_0".to_string(),
lang: "eng".to_string(),
default: true,
wave: "sine".to_string(),
},
AudioStream {
name: "audio_1".to_string(),
lang: "fre".to_string(),
default: false,
wave: "white-noise".to_string(),
},
],
all_mimes: vec![],
path: manifest_path.clone(),
wrote_manifest: false,
}));
{
let state_lock = state.lock().unwrap();
for stream in &state_lock.video_streams {
stream.setup(state.clone(), &pipeline, &path)?;
}
for stream in &state_lock.audio_streams {
stream.setup(state.clone(), &pipeline, &path)?;
}
}
pipeline.set_state(gst::State::Playing)?;
let bus = pipeline
.bus()
.expect("Pipeline without bus. Shouldn't happen!");
for msg in bus.iter_timed(gst::ClockTime::NONE) {
use gst::MessageView;
match msg.view() {
MessageView::Eos(..) => {
println!("EOS");
break;
}
MessageView::Error(err) => {
pipeline.set_state(gst::State::Null)?;
eprintln!(
"Got error from {}: {} ({})",
msg.src()
.map(|s| String::from(s.path_string()))
.unwrap_or_else(|| "None".into()),
err.error(),
err.debug().unwrap_or_else(|| "".into()),
);
break;
}
_ => (),
}
}
pipeline.set_state(gst::State::Null)?;
Ok(())
}