mirror of
https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs.git
synced 2024-09-26 14:00:12 +00:00
426 lines
12 KiB
Rust
426 lines
12 KiB
Rust
// Copyright (C) 2017 Author: Arun Raghavan <arun@arunraghavan.net>
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::sync::Mutex;
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use bytes::Bytes;
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use futures::future;
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use once_cell::sync::Lazy;
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use rusoto_s3::*;
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use glib::prelude::*;
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use glib::subclass::prelude::*;
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use gst::subclass::prelude::*;
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use gst::{gst_debug, gst_error, gst_info};
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use gst_base::prelude::*;
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use gst_base::subclass::base_src::CreateSuccess;
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use gst_base::subclass::prelude::*;
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use crate::s3url::*;
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use crate::s3utils::{self, WaitError};
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#[allow(clippy::large_enum_variant)]
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enum StreamingState {
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Stopped,
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Started {
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url: GstS3Url,
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client: S3Client,
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size: u64,
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},
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}
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impl Default for StreamingState {
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fn default() -> StreamingState {
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StreamingState::Stopped
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}
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}
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#[derive(Default)]
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pub struct S3Src {
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url: Mutex<Option<GstS3Url>>,
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state: Mutex<StreamingState>,
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canceller: Mutex<Option<future::AbortHandle>>,
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}
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static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
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gst::DebugCategory::new(
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"rusotos3src",
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gst::DebugColorFlags::empty(),
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Some("Amazon S3 Source"),
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)
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});
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impl S3Src {
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fn cancel(&self) {
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let mut canceller = self.canceller.lock().unwrap();
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if let Some(c) = canceller.take() {
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c.abort()
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};
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}
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fn connect(self: &S3Src, url: &GstS3Url) -> S3Client {
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S3Client::new(url.region.clone())
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}
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fn set_uri(self: &S3Src, _: &super::S3Src, url_str: Option<&str>) -> Result<(), glib::Error> {
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let state = self.state.lock().unwrap();
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if let StreamingState::Started { .. } = *state {
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return Err(glib::Error::new(
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gst::URIError::BadState,
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"Cannot set URI on a started s3src",
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));
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}
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let mut url = self.url.lock().unwrap();
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if url_str.is_none() {
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*url = None;
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return Ok(());
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}
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let url_str = url_str.unwrap();
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match parse_s3_url(url_str) {
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Ok(s3url) => {
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*url = Some(s3url);
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Ok(())
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}
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Err(_) => Err(glib::Error::new(
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gst::URIError::BadUri,
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"Could not parse URI",
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)),
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}
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}
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fn head(
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self: &S3Src,
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src: &super::S3Src,
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client: &S3Client,
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url: &GstS3Url,
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) -> Result<u64, gst::ErrorMessage> {
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let request = HeadObjectRequest {
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bucket: url.bucket.clone(),
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key: url.object.clone(),
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version_id: url.version.clone(),
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..Default::default()
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};
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let response = client.head_object(request);
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let output = s3utils::wait(&self.canceller, response).map_err(|err| match err {
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WaitError::FutureError(err) => gst::error_msg!(
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gst::ResourceError::NotFound,
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["Failed to HEAD object: {}", err]
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),
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WaitError::Cancelled => {
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gst::error_msg!(gst::LibraryError::Failed, ["Interrupted during start"])
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}
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})?;
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if let Some(size) = output.content_length {
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gst_info!(CAT, obj: src, "HEAD success, content length = {}", size);
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Ok(size as u64)
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} else {
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Err(gst::error_msg!(
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gst::ResourceError::Read,
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["Failed to get content length"]
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))
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}
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}
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/* Returns the bytes, Some(error) if one occured, or a None error if interrupted */
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fn get(
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self: &S3Src,
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src: &super::S3Src,
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offset: u64,
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length: u64,
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) -> Result<Bytes, Option<gst::ErrorMessage>> {
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let state = self.state.lock().unwrap();
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let (url, client) = match *state {
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StreamingState::Started {
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ref url,
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ref client,
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..
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} => (url, client),
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StreamingState::Stopped => {
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return Err(Some(gst::error_msg!(
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gst::LibraryError::Failed,
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["Cannot GET before start()"]
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)));
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}
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};
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let request = GetObjectRequest {
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bucket: url.bucket.clone(),
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key: url.object.clone(),
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range: Some(format!("bytes={}-{}", offset, offset + length - 1)),
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version_id: url.version.clone(),
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..Default::default()
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};
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gst_debug!(
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CAT,
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obj: src,
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"Requesting range: {}-{}",
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offset,
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offset + length - 1
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);
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let response = client.get_object(request);
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let output = s3utils::wait(&self.canceller, response).map_err(|err| match err {
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WaitError::FutureError(err) => Some(gst::error_msg!(
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gst::ResourceError::Read,
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["Could not read: {}", err]
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)),
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WaitError::Cancelled => None,
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})?;
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gst_debug!(
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CAT,
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obj: src,
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"Read {} bytes",
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output.content_length.unwrap()
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);
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s3utils::wait_stream(&self.canceller, &mut output.body.unwrap()).map_err(|err| match err {
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WaitError::FutureError(err) => Some(gst::error_msg!(
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gst::ResourceError::Read,
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["Could not read: {}", err]
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)),
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WaitError::Cancelled => None,
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})
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}
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}
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#[glib::object_subclass]
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impl ObjectSubclass for S3Src {
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const NAME: &'static str = "RusotoS3Src";
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type Type = super::S3Src;
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type ParentType = gst_base::BaseSrc;
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type Interfaces = (gst::URIHandler,);
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}
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impl ObjectImpl for S3Src {
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fn properties() -> &'static [glib::ParamSpec] {
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static PROPERTIES: Lazy<Vec<glib::ParamSpec>> = Lazy::new(|| {
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vec![glib::ParamSpec::new_string(
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"uri",
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"URI",
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"The S3 object URI",
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None,
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glib::ParamFlags::READWRITE | gst::PARAM_FLAG_MUTABLE_READY,
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)]
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});
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PROPERTIES.as_ref()
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}
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fn set_property(
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&self,
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obj: &Self::Type,
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_id: usize,
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value: &glib::Value,
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pspec: &glib::ParamSpec,
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) {
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match pspec.name() {
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"uri" => {
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let _ = self.set_uri(obj, value.get().expect("type checked upstream"));
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}
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_ => unimplemented!(),
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}
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}
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fn property(&self, _: &Self::Type, _id: usize, pspec: &glib::ParamSpec) -> glib::Value {
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match pspec.name() {
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"uri" => {
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let url = match *self.url.lock().unwrap() {
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Some(ref url) => url.to_string(),
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None => "".to_string(),
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};
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url.to_value()
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}
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_ => unimplemented!(),
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}
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}
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fn constructed(&self, obj: &Self::Type) {
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self.parent_constructed(obj);
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obj.set_format(gst::Format::Bytes);
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/* Set a larger default blocksize to make read more efficient */
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obj.set_blocksize(256 * 1024);
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}
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}
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impl ElementImpl for S3Src {
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fn metadata() -> Option<&'static gst::subclass::ElementMetadata> {
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static ELEMENT_METADATA: Lazy<gst::subclass::ElementMetadata> = Lazy::new(|| {
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gst::subclass::ElementMetadata::new(
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"Amazon S3 source",
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"Source/Network",
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"Reads an object from Amazon S3",
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"Arun Raghavan <arun@arunraghavan.net>",
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)
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});
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Some(&*ELEMENT_METADATA)
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}
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fn pad_templates() -> &'static [gst::PadTemplate] {
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static PAD_TEMPLATES: Lazy<Vec<gst::PadTemplate>> = Lazy::new(|| {
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let caps = gst::Caps::new_any();
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let src_pad_template = gst::PadTemplate::new(
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"src",
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gst::PadDirection::Src,
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gst::PadPresence::Always,
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&caps,
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)
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.unwrap();
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vec![src_pad_template]
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});
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PAD_TEMPLATES.as_ref()
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}
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}
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impl URIHandlerImpl for S3Src {
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const URI_TYPE: gst::URIType = gst::URIType::Src;
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fn protocols() -> &'static [&'static str] {
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&["s3"]
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}
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fn uri(&self, _: &Self::Type) -> Option<String> {
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self.url.lock().unwrap().as_ref().map(|s| s.to_string())
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}
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fn set_uri(&self, element: &Self::Type, uri: &str) -> Result<(), glib::Error> {
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self.set_uri(element, Some(uri))
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}
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}
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impl BaseSrcImpl for S3Src {
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fn is_seekable(&self, _: &Self::Type) -> bool {
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true
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}
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fn size(&self, _: &Self::Type) -> Option<u64> {
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match *self.state.lock().unwrap() {
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StreamingState::Stopped => None,
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StreamingState::Started { size, .. } => Some(size),
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}
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}
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fn start(&self, src: &Self::Type) -> Result<(), gst::ErrorMessage> {
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let mut state = self.state.lock().unwrap();
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if let StreamingState::Started { .. } = *state {
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unreachable!("RusotoS3Src is already started");
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}
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let s3url = match *self.url.lock().unwrap() {
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Some(ref url) => url.clone(),
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None => {
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return Err(gst::error_msg!(
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gst::ResourceError::Settings,
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["Cannot start without a URL being set"]
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));
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}
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};
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let s3client = self.connect(&s3url);
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let size = self.head(src, &s3client, &s3url)?;
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*state = StreamingState::Started {
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url: s3url,
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client: s3client,
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size,
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};
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Ok(())
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}
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fn stop(&self, _: &Self::Type) -> Result<(), gst::ErrorMessage> {
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// First, stop any asynchronous tasks if we're running, as they will have the state lock
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self.cancel();
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let mut state = self.state.lock().unwrap();
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if let StreamingState::Stopped = *state {
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unreachable!("Cannot stop before start");
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}
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*state = StreamingState::Stopped;
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Ok(())
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}
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fn query(&self, src: &Self::Type, query: &mut gst::QueryRef) -> bool {
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if let gst::QueryView::Scheduling(ref mut q) = query.view_mut() {
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q.set(
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gst::SchedulingFlags::SEQUENTIAL | gst::SchedulingFlags::BANDWIDTH_LIMITED,
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1,
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-1,
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0,
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);
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q.add_scheduling_modes(&[gst::PadMode::Push, gst::PadMode::Pull]);
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return true;
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}
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BaseSrcImplExt::parent_query(self, src, query)
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}
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fn create(
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&self,
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src: &Self::Type,
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offset: u64,
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buffer: Option<&mut gst::BufferRef>,
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length: u32,
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) -> Result<CreateSuccess, gst::FlowError> {
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// FIXME: sanity check on offset and length
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let data = self.get(src, offset, u64::from(length));
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match data {
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/* Got data */
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Ok(bytes) => {
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if let Some(buffer) = buffer {
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if let Err(copied_bytes) = buffer.copy_from_slice(0, bytes.as_ref()) {
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buffer.set_size(copied_bytes);
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}
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Ok(CreateSuccess::FilledBuffer)
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} else {
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Ok(CreateSuccess::NewBuffer(gst::Buffer::from_slice(bytes)))
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}
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}
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/* Interrupted */
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Err(None) => Err(gst::FlowError::Flushing),
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/* Actual Error */
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Err(Some(err)) => {
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gst_error!(CAT, obj: src, "Could not GET: {}", err);
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Err(gst::FlowError::Error)
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}
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}
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}
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/* FIXME: implement */
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fn do_seek(&self, _: &Self::Type, _: &mut gst::Segment) -> bool {
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true
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}
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fn unlock(&self, _: &Self::Type) -> Result<(), gst::ErrorMessage> {
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self.cancel();
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Ok(())
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}
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}
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