audio/transcribe: remove and merge with rusoto

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/348>

5 files changed, 0 insertions, 1441 deletions

diff --git a/audio/transcribe/Cargo.toml b/audio/transcribe/Cargo.toml
deleted file mode 100644
index d14b1aa0a..000000000
--- a/audio/transcribe/Cargo.toml
+++ /dev/null
@@ -1,36 +0,0 @@
-[package]
-name = "gst-plugin-transcribe"
-version = "0.6.0"
-authors = ["Jordan Petridis <jordan@centricular.com>", "Mathieu Duponchelle <mathieu@centricular.com>"]
-edition = "2018"
-description = "AWS Transcribe plugin"
-repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
-license = "LGPL-2.1-or-later"
-
-[dependencies]
-glib = { git = "https://github.com/gtk-rs/glib" }
-gstreamer = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
-gstreamer-base = { git = "https://gitlab.freedesktop.org/gstreamer/gstreamer-rs" }
-rusoto_core = "0.43.0"
-rusoto_credential = "0.43.0"
-rusoto_transcribe = "0.43.0"
-rusoto_signature = "0.43.0"
-reqwest = { version = "0.10", features = ["cookies", "gzip"] }
-futures = "0.3"
-tokio = { version = "0.2", features = ["time", "rt-threaded"] }
-async-tungstenite = { version = "0.5", features = ["tokio", "tokio-runtime", "tokio-tls"] }
-nom = "5.1.1"
-crc = "1.8.1"
-byteorder = "1.3.4"
-once_cell = "1.0"
-serde = "1"
-serde_derive = "1"
-serde_json = "1"
-
-[lib]
-name = "gsttranscribe"
-crate-type = ["cdylib", "rlib"]
-path = "src/lib.rs"
-
-[build-dependencies]
-gst-plugin-version-helper = { path="../../version-helper" }
diff --git a/audio/transcribe/build.rs b/audio/transcribe/build.rs
deleted file mode 100644
index 17be1215e..000000000
--- a/audio/transcribe/build.rs
+++ /dev/null
@@ -1,3 +0,0 @@
-fn main() {
-    gst_plugin_version_helper::get_info()
-}
diff --git a/audio/transcribe/src/aws_transcribe_parse.rs b/audio/transcribe/src/aws_transcribe_parse.rs
deleted file mode 100644
index bd76108cd..000000000
--- a/audio/transcribe/src/aws_transcribe_parse.rs
+++ /dev/null
@@ -1,1182 +0,0 @@
-// Copyright (C) 2020 Mathieu Duponchelle <mathieu@centricular.com>
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Library General Public
-// License as published by the Free Software Foundation; either
-// version 2 of the License, or (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-// Library General Public License for more details.
-//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the
-// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
-// Boston, MA 02110-1335, USA.
-
-use glib::prelude::*;
-use glib::subclass;
-use glib::subclass::prelude::*;
-use gst::prelude::*;
-use gst::subclass::prelude::*;
-
-use std::default::Default;
-
-use rusoto_core::Region;
-use rusoto_credential::{EnvironmentProvider, ProvideAwsCredentials};
-
-use rusoto_signature::signature::SignedRequest;
-
-use async_tungstenite::tungstenite::error::Error as WsError;
-use async_tungstenite::{tokio::connect_async, tungstenite::Message};
-use futures::channel::mpsc;
-use futures::future::{abortable, AbortHandle};
-use futures::prelude::*;
-use tokio::runtime;
-
-use std::collections::VecDeque;
-use std::pin::Pin;
-use std::sync::Mutex;
-use std::time::Duration;
-
-use crate::packet::*;
-
-use serde_derive::Deserialize;
-
-use once_cell::sync::Lazy;
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct TranscriptItem {
-    content: String,
-    end_time: f32,
-    start_time: f32,
-    #[serde(rename = "Type")]
-    type_: String,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct TranscriptAlternative {
-    items: Vec<TranscriptItem>,
-    transcript: String,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct TranscriptResult {
-    alternatives: Vec<TranscriptAlternative>,
-    end_time: f32,
-    start_time: f32,
-    is_partial: bool,
-    result_id: String,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct TranscriptTranscript {
-    results: Vec<TranscriptResult>,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct Transcript {
-    transcript: TranscriptTranscript,
-}
-
-#[derive(Deserialize, Debug)]
-#[serde(rename_all = "PascalCase")]
-struct ExceptionMessage {
-    message: String,
-}
-
-static CAT: Lazy<gst::DebugCategory> = Lazy::new(|| {
-    gst::DebugCategory::new(
-        "awstranscribe",
-        gst::DebugColorFlags::empty(),
-        Some("AWS Transcribe element"),
-    )
-});
-
-static RUNTIME: Lazy<runtime::Runtime> = Lazy::new(|| {
-    runtime::Builder::new()
-        .threaded_scheduler()
-        .enable_all()
-        .core_threads(1)
-        .build()
-        .unwrap()
-});
-
-const DEFAULT_LATENCY_MS: u32 = 8000;
-const DEFAULT_USE_PARTIAL_RESULTS: bool = true;
-const GRANULARITY_MS: u32 = 100;
-
-static PROPERTIES: [subclass::Property; 3] = [
-    subclass::Property("language-code", |name| {
-        glib::ParamSpec::string(
-            name,
-            "Language Code",
-            "The Language of the Stream, see \
-                <https://docs.aws.amazon.com/transcribe/latest/dg/how-streaming-transcription.html> \
-                for an up to date list of allowed languages",
-            Some("en-US"),
-            glib::ParamFlags::READWRITE,
-        )
-    }),
-    subclass::Property("use-partial-results", |name| {
-        glib::ParamSpec::boolean(
-            name,
-            "Latency",
-            "Whether partial results from AWS should be used",
-            DEFAULT_USE_PARTIAL_RESULTS,
-            glib::ParamFlags::READWRITE,
-        )
-    }),
-    subclass::Property("latency", |name| {
-        glib::ParamSpec::uint(
-            name,
-            "Latency",
-            "Amount of milliseconds to allow AWS transcribe",
-            2 * GRANULARITY_MS,
-            std::u32::MAX,
-            DEFAULT_LATENCY_MS,
-            glib::ParamFlags::READWRITE,
-        )
-    }),
-];
-
-#[derive(Debug, Clone)]
-struct Settings {
-    latency_ms: u32,
-    language_code: Option<String>,
-    use_partial_results: bool,
-}
-
-impl Default for Settings {
-    fn default() -> Self {
-        Self {
-            latency_ms: DEFAULT_LATENCY_MS,
-            language_code: Some("en-US".to_string()),
-            use_partial_results: DEFAULT_USE_PARTIAL_RESULTS,
-        }
-    }
-}
-
-struct State {
-    connected: bool,
-    sender: Option<mpsc::Sender<Message>>,
-    recv_abort_handle: Option<AbortHandle>,
-    send_abort_handle: Option<AbortHandle>,
-    in_segment: gst::FormattedSegment<gst::ClockTime>,
-    out_segment: gst::FormattedSegment<gst::ClockTime>,
-    seqnum: gst::Seqnum,
-    buffers: VecDeque<gst::Buffer>,
-    send_eos: bool,
-    discont: bool,
-    last_partial_end_time: gst::ClockTime,
-    partial_alternative: Option<TranscriptAlternative>,
-}
-
-impl Default for State {
-    fn default() -> Self {
-        Self {
-            connected: false,
-            sender: None,
-            recv_abort_handle: None,
-            send_abort_handle: None,
-            in_segment: gst::FormattedSegment::new(),
-            out_segment: gst::FormattedSegment::new(),
-            seqnum: gst::Seqnum::next(),
-            buffers: VecDeque::new(),
-            send_eos: false,
-            discont: true,
-            last_partial_end_time: gst::CLOCK_TIME_NONE,
-            partial_alternative: None,
-        }
-    }
-}
-
-type WsSink = Pin<Box<dyn Sink<Message, Error = WsError> + Send>>;
-
-struct Transcriber {
-    srcpad: gst::Pad,
-    sinkpad: gst::Pad,
-    settings: Mutex<Settings>,
-    state: Mutex<State>,
-    ws_sink: Mutex<Option<WsSink>>,
-}
-
-fn build_packet(payload: &[u8]) -> Vec<u8> {
-    let headers = [
-        Header {
-            name: ":event-type".into(),
-            value: "AudioEvent".into(),
-            value_type: 7,
-        },
-        Header {
-            name: ":content-type".into(),
-            value: "application/octet-stream".into(),
-            value_type: 7,
-        },
-        Header {
-            name: ":message-type".into(),
-            value: "event".into(),
-            value_type: 7,
-        },
-    ];
-
-    encode_packet(payload, &headers).expect("foobar")
-}
-
-impl Transcriber {
-    fn set_pad_functions(sinkpad: &gst::Pad, srcpad: &gst::Pad) {
-        sinkpad.set_chain_function(|pad, parent, buffer| {
-            Transcriber::catch_panic_pad_function(
-                parent,
-                || Err(gst::FlowError::Error),
-                |transcriber, element| transcriber.sink_chain(pad, element, buffer),
-            )
-        });
-        sinkpad.set_event_function(|pad, parent, event| {
-            Transcriber::catch_panic_pad_function(
-                parent,
-                || false,
-                |transcriber, element| transcriber.sink_event(pad, element, event),
-            )
-        });
-
-        srcpad.set_activatemode_function(|pad, parent, mode, active| {
-            Transcriber::catch_panic_pad_function(
-                parent,
-                || {
-                    Err(gst_loggable_error!(
-                        CAT,
-                        "Panic activating src pad with mode"
-                    ))
-                },
-                |transcriber, element| transcriber.src_activatemode(pad, element, mode, active),
-            )
-        });
-        srcpad.set_query_function(|pad, parent, query| {
-            Transcriber::catch_panic_pad_function(
-                parent,
-                || false,
-                |transcriber, element| transcriber.src_query(pad, element, query),
-            )
-        });
-    }
-
-    fn dequeue(&self, element: &gst::Element) -> bool {
-        /* First, check our pending buffers */
-        let mut items = vec![];
-
-        let (latency, now, mut last_position, send_eos, seqnum) = {
-            let mut state = self.state.lock().unwrap();
-            // Multiply GRANULARITY by 2 in order to not send buffers that
-            // are less than GRANULARITY milliseconds away too late
-            let latency: gst::ClockTime = (self.settings.lock().unwrap().latency_ms as u64
-                - (2 * GRANULARITY_MS) as u64)
-                * gst::MSECOND;
-            let now = element.get_current_running_time();
-
-            if let Some(alternative) = state.partial_alternative.take() {
-                self.enqueue(element, &mut state, &alternative, true, latency, now);
-                state.partial_alternative = Some(alternative);
-            }
-            let send_eos = state.send_eos && state.buffers.is_empty();
-
-            while let Some(buf) = state.buffers.front() {
-                if now - buf.get_pts() > latency {
-                    /* Safe unwrap, we know we have an item */
-                    let buf = state.buffers.pop_front().unwrap();
-                    items.push(buf);
-                } else {
-                    break;
-                }
-            }
-
-            (
-                latency,
-                now,
-                state.out_segment.get_position(),
-                send_eos,
-                state.seqnum,
-            )
-        };
-
-        /* We're EOS, we can pause and exit early */
-        if send_eos {
-            let _ = self.srcpad.pause_task();
-
-            return self
-                .srcpad
-                .push_event(gst::Event::new_eos().seqnum(seqnum).build());
-        }
-
-        for mut buf in items.drain(..) {
-            if buf.get_pts() > last_position {
-                let gap_event = gst::Event::new_gap(last_position, buf.get_pts() - last_position)
-                    .seqnum(seqnum)
-                    .build();
-                gst_debug!(
-                    CAT,
-                    "Pushing gap:    {} -> {}",
-                    last_position,
-                    buf.get_pts()
-                );
-                if !self.srcpad.push_event(gap_event) {
-                    return false;
-                }
-            }
-            last_position = buf.get_pts() + buf.get_duration();
-            {
-                let buf = buf.get_mut().unwrap();
-                buf.set_pts(buf.get_pts());
-            }
-            gst_debug!(
-                CAT,
-                "Pushing buffer: {} -> {}",
-                buf.get_pts(),
-                buf.get_pts() + buf.get_duration()
-            );
-            if self.srcpad.push(buf).is_err() {
-                return false;
-            }
-        }
-
-        /* next, push a gap if we're lagging behind the target position */
-
-        if now - last_position > latency {
-            let duration = now - last_position - latency;
-
-            let gap_event = gst::Event::new_gap(last_position, duration)
-                .seqnum(seqnum)
-                .build();
-            gst_debug!(
-                CAT,
-                "Pushing gap:    {} -> {}",
-                last_position,
-                last_position + duration
-            );
-            last_position += duration;
-            if !self.srcpad.push_event(gap_event) {
-                return false;
-            }
-        }
-
-        self.state
-            .lock()
-            .unwrap()
-            .out_segment
-            .set_position(last_position);
-
-        true
-    }
-
-    fn enqueue(
-        &self,
-        element: &gst::Element,
-        state: &mut State,
-        alternative: &TranscriptAlternative,
-        partial: bool,
-        latency: gst::ClockTime,
-        now: gst::ClockTime,
-    ) {
-        for item in &alternative.items {
-            let mut start_time: gst::ClockTime =
-                ((item.start_time as f64 * 1_000_000_000.0) as u64).into();
-            let mut end_time: gst::ClockTime =
-                ((item.end_time as f64 * 1_000_000_000.0) as u64).into();
-
-            if start_time <= state.last_partial_end_time {
-                /* Already sent (hopefully) */
-                continue;
-            } else if !partial || start_time + latency < now {
-                /* Should be sent now */
-                gst_debug!(CAT, obj: element, "Item is ready: {}", item.content);
-                let mut buf = gst::Buffer::from_mut_slice(item.content.clone().into_bytes());
-                state.last_partial_end_time = end_time;
-
-                {
-                    let buf = buf.get_mut().unwrap();
-
-                    if state.discont {
-                        buf.set_flags(gst::BufferFlags::DISCONT);
-                        state.discont = false;
-                    }
-
-                    if start_time < state.out_segment.get_position() {
-                        gst_debug!(
-                            CAT,
-                            obj: element,
-                            "Adjusting item timing({:?} < {:?})",
-                            start_time,
-                            state.out_segment.get_position()
-                        );
-                        start_time = state.out_segment.get_position();
-                        if end_time < start_time {
-                            end_time = start_time;
-                        }
-                    }
-
-                    buf.set_pts(start_time);
-                    buf.set_duration(end_time - start_time);
-                }
-
-                state.buffers.push_back(buf);
-            } else {
-                /* Doesn't need to be sent yet */
-                break;
-            }
-        }
-    }
-
-    fn loop_fn(
-        &self,
-        element: &gst::Element,
-        receiver: &mut mpsc::Receiver<Message>,
-    ) -> Result<(), gst::ErrorMessage> {
-        let future = async move {
-            let msg = match receiver.next().await {
-                Some(msg) => msg,
-                /* Sender was closed */
-                None => {
-                    let _ = self.srcpad.pause_task();
-                    return Ok(());
-                }
-            };
-
-            match msg {
-                Message::Binary(buf) => {
-                    let (_, pkt) = parse_packet(&buf).map_err(|err| {
-                        gst_error!(CAT, obj: element, "Failed to parse packet: {}", err);
-                        gst_error_msg!(
-                            gst::StreamError::Failed,
-                            ["Failed to parse packet: {}", err]
-                        )
-                    })?;
-
-                    let payload = std::str::from_utf8(pkt.payload).unwrap();
-
-                    if packet_is_exception(&pkt) {
-                        let message: ExceptionMessage =
-                            serde_json::from_str(&payload).map_err(|err| {
-                                gst_error!(
-                                    CAT,
-                                    obj: element,
-                                    "Unexpected exception message: {} ({})",
-                                    payload,
-                                    err
-                                );
-                                gst_error_msg!(
-                                    gst::StreamError::Failed,
-                                    ["Unexpected exception message: {} ({})", payload, err]
-                                )
-                            })?;
-                        gst_error!(
-                            CAT,
-                            obj: element,
-                            "AWS raised an error: {}",
-                            message.message
-                        );
-
-                        return Err(gst_error_msg!(
-                            gst::StreamError::Failed,
-                            ["AWS raised an error: {}", message.message]
-                        ));
-                    }
-
-                    let mut transcript: Transcript =
-                        serde_json::from_str(&payload).map_err(|err| {
-                            gst_error_msg!(
-                                gst::StreamError::Failed,
-                                ["Unexpected binary message: {} ({})", payload, err]
-                            )
-                        })?;
-
-                    if !transcript.transcript.results.is_empty() {
-                        let mut result = transcript.transcript.results.remove(0);
-                        let use_partial_results = self.settings.lock().unwrap().use_partial_results;
-                        if !result.is_partial && !result.alternatives.is_empty() {
-                            if !use_partial_results {
-                                let alternative = result.alternatives.remove(0);
-                                gst_info!(
-                                    CAT,
-                                    obj: element,
-                                    "Transcript: {}",
-                                    alternative.transcript
-                                );
-
-                                let mut start_time: gst::ClockTime =
-                                    ((result.start_time as f64 * 1_000_000_000.0) as u64).into();
-                                let end_time: gst::ClockTime =
-                                    ((result.end_time as f64 * 1_000_000_000.0) as u64).into();
-
-                                let mut state = self.state.lock().unwrap();
-                                let position = state.out_segment.get_position();
-
-                                if end_time < position {
-                                    gst_warning!(CAT, obj: element,
-                                                 "Received transcript is too late by {:?}, dropping, consider increasing the latency",
-                                                 position - start_time);
-                                } else {
-                                    if start_time < position {
-                                        gst_warning!(CAT, obj: element,
-                                                     "Received transcript is too late by {:?}, clipping, consider increasing the latency",
-                                                     position - start_time);
-                                        start_time = position;
-                                    }
-
-                                    let mut buf = gst::Buffer::from_mut_slice(
-                                        alternative.transcript.into_bytes(),
-                                    );
-
-                                    {
-                                        let buf = buf.get_mut().unwrap();
-
-                                        if state.discont {
-                                            buf.set_flags(gst::BufferFlags::DISCONT);
-                                            state.discont = false;
-                                        }
-
-                                        buf.set_pts(start_time);
-                                        buf.set_duration(end_time - start_time);
-                                    }
-
-                                    gst_debug!(
-                                        CAT,
-                                        obj: element,
-                                        "Adding pending buffer: {:?}",
-                                        buf
-                                    );
-
-                                    state.buffers.push_back(buf);
-                                }
-                            } else {
-                                let alternative = result.alternatives.remove(0);
-                                let mut state = self.state.lock().unwrap();
-                                self.enqueue(
-                                    element,
-                                    &mut state,
-                                    &alternative,
-                                    false,
-                                    0.into(),
-                                    0.into(),
-                                );
-                                state.partial_alternative = None;
-                            }
-                        } else if !result.alternatives.is_empty() && use_partial_results {
-                            let mut state = self.state.lock().unwrap();
-                            state.partial_alternative = Some(result.alternatives.remove(0));
-                        }
-                    }
-                    Ok(())
-                }
-
-                _ => Ok(()),
-            }
-        };
-
-        /* Wrap in a timeout so we can push gaps regularly */
-        let future = async move {
-            match tokio::time::timeout(Duration::from_millis(GRANULARITY_MS.into()), future).await {
-                Err(_) => {
-                    if !self.dequeue(element) {
-                        gst_info!(CAT, obj: element, "Failed to push gap event, pausing");
-
-                        let _ = self.srcpad.pause_task();
-                    }
-                    Ok(())
-                }
-                Ok(res) => {
-                    if !self.dequeue(element) {
-                        gst_info!(CAT, obj: element, "Failed to push gap event, pausing");
-
-                        let _ = self.srcpad.pause_task();
-                    }
-                    res
-                }
-            }
-        };
-
-        RUNTIME.enter(|| futures::executor::block_on(future))
-    }
-
-    fn start_task(&self, element: &gst::Element) -> Result<(), gst::LoggableError> {
-        let element_weak = element.downgrade();
-        let pad_weak = self.srcpad.downgrade();
-        let (sender, mut receiver) = mpsc::channel(1);
-
-        {
-            let mut state = self.state.lock().unwrap();
-            state.sender = Some(sender);
-        }
-
-        let res = self.srcpad.start_task(move || {
-            let element = match element_weak.upgrade() {
-                Some(element) => element,
-                None => {
-                    if let Some(pad) = pad_weak.upgrade() {
-                        let _ = pad.pause_task();
-                    }
-                    return;
-                }
-            };
-
-            let transcribe = Self::from_instance(&element);
-            match transcribe.loop_fn(&element, &mut receiver) {
-                Err(err) => {
-                    gst_element_error!(
-                        &element,
-                        gst::StreamError::Failed,
-                        ["Streaming failed: {}", err]
-                    );
-                    let _ = transcribe.srcpad.pause_task();
-                }
-                Ok(_) => (),
-            };
-        });
-        if res.is_err() {
-            return Err(gst_loggable_error!(CAT, "Failed to start pad task"));
-        }
-        Ok(())
-    }
-
-    fn src_activatemode(
-        &self,
-        _pad: &gst::Pad,
-        element: &gst::Element,
-        _mode: gst::PadMode,
-        active: bool,
-    ) -> Result<(), gst::LoggableError> {
-        if active {
-            self.start_task(element)?;
-        } else {
-            {
-                let mut state = self.state.lock().unwrap();
-                state.sender = None;
-            }
-
-            let _ = self.srcpad.stop_task();
-        }
-
-        Ok(())
-    }
-
-    fn src_query(&self, pad: &gst::Pad, element: &gst::Element, query: &mut gst::QueryRef) -> bool {
-        use gst::QueryView;
-
-        gst_log!(CAT, obj: pad, "Handling query {:?}", query);
-
-        match query.view_mut() {
-            QueryView::Latency(ref mut q) => {
-                let mut peer_query = gst::query::Query::new_latency();
-
-                let ret = self.sinkpad.peer_query(&mut peer_query);
-
-                if ret {
-                    let (_, min, _) = peer_query.get_result();
-                    let our_latency: gst::ClockTime =
-                        self.settings.lock().unwrap().latency_ms as u64 * gst::MSECOND;
-                    q.set(true, our_latency + min, gst::CLOCK_TIME_NONE);
-                }
-                ret
-            }
-            QueryView::Position(ref mut q) => {
-                if q.get_format() == gst::Format::Time {
-                    let state = self.state.lock().unwrap();
-                    q.set(
-                        state
-                            .out_segment
-                            .to_stream_time(state.out_segment.get_position()),
-                    );
-                    true
-                } else {
-                    false
-                }
-            }
-            _ => pad.query_default(Some(element), query),
-        }
-    }
-
-    fn sink_event(&self, pad: &gst::Pad, element: &gst::Element, event: gst::Event) -> bool {
-        use gst::EventView;
-
-        gst_debug!(CAT, obj: pad, "Handling event {:?}", event);
-
-        match event.view() {
-            EventView::Eos(_) => match self.handle_buffer(pad, element, None) {
-                Err(err) => {
-                    gst_error!(CAT, "Failed to send EOS to AWS: {}", err);
-                    false
-                }
-                Ok(_) => true,
-            },
-            EventView::FlushStart(_) => {
-                gst_info!(CAT, obj: element, "Received flush start, disconnecting");
-                match self.disconnect(element) {
-                    Err(err) => {
-                        element.post_error_message(&err);
-                        false
-                    }
-                    Ok(_) => {
-                        let mut ret = pad.event_default(Some(element), event);
-
-                        match self.srcpad.stop_task() {
-                            Err(err) => {
-                                gst_error!(
-                                    CAT,
-                                    obj: element,
-                                    "Failed to stop srcpad task: {}",
-                                    err
-                                );
-                                ret = false;
-                            }
-                            Ok(_) => (),
-                        };
-
-                        ret
-                    }
-                }
-            }
-            EventView::FlushStop(_) => {
-                gst_info!(CAT, obj: element, "Received flush stop, restarting task");
-
-                if pad.event_default(Some(element), event) {
-                    match self.start_task(element) {
-                        Err(err) => {
-                            gst_error!(CAT, obj: element, "Failed to start srcpad task: {}", err);
-                            false
-                        }
-                        Ok(_) => true,
-                    }
-                } else {
-                    false
-                }
-            }
-            EventView::Segment(e) => {
-                let segment = match e.get_segment().clone().downcast::<gst::ClockTime>() {
-                    Err(segment) => {
-                        gst_element_error!(
-                            element,
-                            gst::StreamError::Format,
-                            [
-                                "Only Time segments supported, got {:?}",
-                                segment.get_format(),
-                            ]
-                        );
-                        return false;
-                    }
-                    Ok(segment) => segment,
-                };
-
-                let event = {
-                    let mut state = self.state.lock().unwrap();
-
-                    state.out_segment.set_time(segment.get_time());
-                    state
-                        .out_segment
-                        .set_position(gst::ClockTime::from_nseconds(0));
-
-                    state.in_segment = segment;
-                    state.seqnum = e.get_seqnum();
-                    gst::Event::new_segment(&state.out_segment)
-                        .seqnum(state.seqnum)
-                        .build()
-                };
-
-                gst_info!(CAT, "Sending our own segment: {:?}", event);
-
-                pad.event_default(Some(element), event)
-            }
-            EventView::Tag(_) => true,
-            EventView::Caps(e) => {
-                gst_info!(CAT, "Received caps {:?}", e);
-
-                let caps = gst::Caps::builder("text/x-raw")
-                    .field("format", &"utf8")
-                    .build();
-                let seqnum = self.state.lock().unwrap().seqnum;
-                self.srcpad
-                    .push_event(gst::Event::new_caps(&caps).seqnum(seqnum).build())
-            }
-            _ => pad.event_default(Some(element), event),
-        }
-    }
-
-    async fn sync_and_send(
-        &self,
-        element: &gst::Element,
-        buffer: Option<gst::Buffer>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError> {
-        let mut delay = None;
-
-        {
-            let state = self.state.lock().unwrap();
-
-            if let Some(buffer) = &buffer {
-                let running_time = state.in_segment.to_running_time(buffer.get_pts());
-                let now = element.get_current_running_time();
-
-                if now.is_some() && now < running_time {
-                    delay = Some(running_time - now);
-                }
-            }
-        }
-
-        if let Some(delay) = delay {
-            tokio::time::delay_for(Duration::from_nanos(delay.nseconds().unwrap())).await;
-        }
-
-        if let Some(ws_sink) = self.ws_sink.lock().unwrap().as_mut() {
-            if let Some(buffer) = buffer {
-                let data = buffer.map_readable().unwrap();
-                for chunk in data.chunks(8192) {
-                    let packet = build_packet(chunk);
-                    ws_sink.send(Message::Binary(packet)).await.map_err(|err| {
-                        gst_error!(CAT, obj: element, "Failed sending packet: {}", err);
-                        gst::FlowError::Error
-                    })?;
-                }
-            } else {
-                // EOS
-                let packet = build_packet(&[]);
-                ws_sink.send(Message::Binary(packet)).await.map_err(|err| {
-                    gst_error!(CAT, obj: element, "Failed sending packet: {}", err);
-                    gst::FlowError::Error
-                })?;
-            }
-        }
-
-        Ok(gst::FlowSuccess::Ok)
-    }
-
-    fn handle_buffer(
-        &self,
-        _pad: &gst::Pad,
-        element: &gst::Element,
-        buffer: Option<gst::Buffer>,
-    ) -> Result<gst::FlowSuccess, gst::FlowError> {
-        gst_debug!(CAT, obj: element, "Handling {:?}", buffer);
-
-        self.ensure_connection(element).map_err(|err| {
-            gst_element_error!(
-                &element,
-                gst::StreamError::Failed,
-                ["Streaming failed: {}", err]
-            );
-            gst::FlowError::Error
-        })?;
-
-        let (future, abort_handle) = abortable(self.sync_and_send(element, buffer));
-
-        self.state.lock().unwrap().send_abort_handle = Some(abort_handle);
-
-        match RUNTIME.enter(|| futures::executor::block_on(future)) {
-            Err(_) => Err(gst::FlowError::Flushing),
-            Ok(res) => res,
-        }
-    }
-
-    fn sink_chain(
-        &self,
-        pad: &gst::Pad,
-        element: &gst::Element,
-        buffer: gst::Buffer,
-    ) -> Result<gst::FlowSuccess, gst::FlowError> {
-        self.handle_buffer(pad, element, Some(buffer))
-    }
-
-    fn ensure_connection(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
-        let mut state = self.state.lock().unwrap();
-
-        if state.connected {
-            return Ok(());
-        }
-
-        let in_caps = self.sinkpad.get_current_caps().unwrap();
-        let s = in_caps.get_structure(0).unwrap();
-        let sample_rate: i32 = s.get("rate").unwrap().unwrap();
-
-        let settings = self.settings.lock().unwrap();
-
-        gst_info!(CAT, obj: element, "Connecting ..");
-
-        let creds = RUNTIME
-            .enter(|| futures::executor::block_on(EnvironmentProvider::default().credentials()))
-            .map_err(|err| {
-                gst_error!(CAT, obj: element, "Failed to generate credentials: {}", err);
-                gst_error_msg!(
-                    gst::CoreError::Failed,
-                    ["Failed to generate credentials: {}", err]
-                )
-            })?;
-
-        let language_code = settings
-            .language_code
-            .as_ref()
-            .expect("Language code is required");
-
-        let region = Region::UsEast1;
-
-        let mut signed = SignedRequest::new(
-            "GET",
-            "transcribe",
-            &region,
-            "/stream-transcription-websocket",
-        );
-        signed.set_hostname(Some(format!(
-            "transcribestreaming.{}.amazonaws.com:8443",
-            region.name()
-        )));
-        signed.add_param("language-code", language_code);
-        signed.add_param("media-encoding", "pcm");
-        signed.add_param("sample-rate", &sample_rate.to_string());
-        let url = signed.generate_presigned_url(&creds, &std::time::Duration::from_secs(60), true);
-
-        let (ws, _) = RUNTIME
-            .enter(|| futures::executor::block_on(connect_async(format!("wss{}", &url[5..]))))
-            .map_err(|err| {
-                gst_error!(CAT, obj: element, "Failed to connect: {}", err);
-                gst_error_msg!(gst::CoreError::Failed, ["Failed to connect: {}", err])
-            })?;
-
-        let (ws_sink, mut ws_stream) = ws.split();
-
-        *self.ws_sink.lock().unwrap() = Some(Box::pin(ws_sink));
-
-        let element_weak = element.downgrade();
-        let future = async move {
-            while let Some(element) = element_weak.upgrade() {
-                let transcribe = Self::from_instance(&element);
-                let msg = match ws_stream.next().await {
-                    Some(msg) => msg,
-                    None => {
-                        let mut state = transcribe.state.lock().unwrap();
-                        state.send_eos = true;
-                        break;
-                    }
-                };
-
-                let msg = match msg {
-                    Ok(msg) => msg,
-                    Err(err) => {
-                        gst_error!(CAT, "Failed to receive data: {}", err);
-                        gst_element_error!(
-                            element,
-                            gst::StreamError::Failed,
-                            ["Streaming failed: {}", err]
-                        );
-                        break;
-                    }
-                };
-
-                let mut sender = transcribe.state.lock().unwrap().sender.clone();
-
-                if let Some(sender) = sender.as_mut() {
-                    if sender.send(msg).await.is_err() {
-                        break;
-                    }
-                }
-            }
-        };
-
-        let (future, abort_handle) = abortable(future);
-
-        state.recv_abort_handle = Some(abort_handle);
-
-        RUNTIME.spawn(future);
-
-        state.connected = true;
-
-        gst_info!(CAT, obj: element, "Connected");
-
-        Ok(())
-    }
-
-    fn disconnect(&self, element: &gst::Element) -> Result<(), gst::ErrorMessage> {
-        let mut state = self.state.lock().unwrap();
-
-        gst_info!(CAT, obj: element, "Unpreparing");
-
-        if let Some(abort_handle) = state.recv_abort_handle.take() {
-            abort_handle.abort();
-        }
-
-        if let Some(abort_handle) = state.send_abort_handle.take() {
-            abort_handle.abort();
-        }
-
-        *state = State::default();
-
-        gst_info!(
-            CAT,
-            obj: element,
-            "Unprepared, connected: {}!",
-            state.connected
-        );
-
-        Ok(())
-    }
-}
-
-impl ObjectSubclass for Transcriber {
-    const NAME: &'static str = "RsAwsTranscriber";
-    type ParentType = gst::Element;
-    type Instance = gst::subclass::ElementInstanceStruct<Self>;
-    type Class = subclass::simple::ClassStruct<Self>;
-
-    glib_object_subclass!();
-
-    fn new_with_class(klass: &subclass::simple::ClassStruct<Self>) -> Self {
-        let templ = klass.get_pad_template("sink").unwrap();
-        let sinkpad = gst::Pad::new_from_template(&templ, Some("sink"));
-        let templ = klass.get_pad_template("src").unwrap();
-        let srcpad = gst::Pad::new_from_template(&templ, Some("src"));
-
-        srcpad.use_fixed_caps();
-
-        Transcriber::set_pad_functions(&sinkpad, &srcpad);
-        let settings = Mutex::new(Settings::default());
-
-        Self {
-            srcpad,
-            sinkpad,
-            settings,
-            state: Mutex::new(State::default()),
-            ws_sink: Mutex::new(None),
-        }
-    }
-
-    fn class_init(klass: &mut subclass::simple::ClassStruct<Self>) {
-        klass.set_metadata(
-            "Transcriber",
-            "Audio/Text/Filter",
-            "Speech to Text filter, using AWS transcribe",
-            "Jordan Petridis <jordan@centricular.com>, Mathieu Duponchelle <mathieu@centricular.com>",
-        );
-
-        let src_caps = gst::Caps::builder("text/x-raw")
-            .field("format", &"utf8")
-            .build();
-        let src_pad_template = gst::PadTemplate::new(
-            "src",
-            gst::PadDirection::Src,
-            gst::PadPresence::Always,
-            &src_caps,
-        )
-        .unwrap();
-        klass.add_pad_template(src_pad_template);
-
-        let sink_caps = gst::Caps::builder("audio/x-raw")
-            .field("format", &"S16LE")
-            .field("rate", &gst::IntRange::<i32>::new(8000, 48000))
-            .field("channels", &1)
-            .build();
-        let sink_pad_template = gst::PadTemplate::new(
-            "sink",
-            gst::PadDirection::Sink,
-            gst::PadPresence::Always,
-            &sink_caps,
-        )
-        .unwrap();
-        klass.add_pad_template(sink_pad_template);
-        klass.install_properties(&PROPERTIES);
-    }
-}
-
-impl ObjectImpl for Transcriber {
-    glib_object_impl!();
-
-    fn constructed(&self, obj: &glib::Object) {
-        self.parent_constructed(obj);
-
-        let element = obj.downcast_ref::<gst::Element>().unwrap();
-        element.add_pad(&self.sinkpad).unwrap();
-        element.add_pad(&self.srcpad).unwrap();
-    }
-
-    fn set_property(&self, _obj: &glib::Object, id: usize, value: &glib::Value) {
-        let prop = &PROPERTIES[id];
-
-        match *prop {
-            subclass::Property("language_code", ..) => {
-                let mut settings = self.settings.lock().unwrap();
-                settings.language_code = value.get().expect("type checked upstream");
-            }
-            subclass::Property("latency", ..) => {
-                let mut settings = self.settings.lock().unwrap();
-                settings.latency_ms = value.get_some().expect("type checked upstream");
-            }
-            subclass::Property("use-partial-results", ..) => {
-                let mut settings = self.settings.lock().unwrap();
-                settings.use_partial_results = value.get_some().expect("type checked upstream");
-            }
-            _ => unimplemented!(),
-        }
-    }
-
-    fn get_property(&self, _obj: &glib::Object, id: usize) -> Result<glib::Value, ()> {
-        let prop = &PROPERTIES[id];
-
-        match *prop {
-            subclass::Property("language-code", ..) => {
-                let settings = self.settings.lock().unwrap();
-                Ok(settings.language_code.to_value())
-            }
-            subclass::Property("latency", ..) => {
-                let settings = self.settings.lock().unwrap();
-                Ok(settings.latency_ms.to_value())
-            }
-            subclass::Property("use-partial-results", ..) => {
-                let settings = self.settings.lock().unwrap();
-                Ok(settings.use_partial_results.to_value())
-            }
-            _ => unimplemented!(),
-        }
-    }
-}
-
-impl ElementImpl for Transcriber {
-    fn change_state(
-        &self,
-        element: &gst::Element,
-        transition: gst::StateChange,
-    ) -> Result<gst::StateChangeSuccess, gst::StateChangeError> {
-        gst_info!(CAT, obj: element, "Changing state {:?}", transition);
-
-        match transition {
-            gst::StateChange::PausedToReady => {
-                self.disconnect(element).map_err(|err| {
-                    element.post_error_message(&err);
-                    gst::StateChangeError
-                })?;
-            }
-            _ => (),
-        }
-
-        let mut success = self.parent_change_state(element, transition)?;
-
-        match transition {
-            gst::StateChange::ReadyToPaused => {
-                success = gst::StateChangeSuccess::NoPreroll;
-            }
-            gst::StateChange::PlayingToPaused => {
-                success = gst::StateChangeSuccess::NoPreroll;
-            }
-            _ => (),
-        }
-
-        Ok(success)
-    }
-}
-
-pub fn register(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    gst::Element::register(
-        Some(plugin),
-        "awstranscriber",
-        gst::Rank::None,
-        Transcriber::get_type(),
-    )
-}
diff --git a/audio/transcribe/src/lib.rs b/audio/transcribe/src/lib.rs
deleted file mode 100644
index a295459e3..000000000
--- a/audio/transcribe/src/lib.rs
+++ /dev/null
@@ -1,41 +0,0 @@
-// Copyright (C) 2020 Mathieu Duponchelle <mathieu@centricular.com>
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Library General Public
-// License as published by the Free Software Foundation; either
-// version 2 of the License, or (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-// Library General Public License for more details.
-//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the
-// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
-// Boston, MA 02110-1335, USA.
-
-#[macro_use]
-extern crate glib;
-#[macro_use]
-extern crate gstreamer as gst;
-
-pub mod packet;
-
-pub mod aws_transcribe_parse;
-
-fn plugin_init(plugin: &gst::Plugin) -> Result<(), glib::BoolError> {
-    aws_transcribe_parse::register(plugin)
-}
-
-gst::gst_plugin_define!(
-    transcribe,
-    env!("CARGO_PKG_DESCRIPTION"),
-    plugin_init,
-    concat!(env!("CARGO_PKG_VERSION"), "-", env!("COMMIT_ID")),
-    "LGPL",
-    env!("CARGO_PKG_NAME"),
-    env!("CARGO_PKG_NAME"),
-    env!("CARGO_PKG_REPOSITORY"),
-    env!("BUILD_REL_DATE")
-);
diff --git a/audio/transcribe/src/packet.rs b/audio/transcribe/src/packet.rs
deleted file mode 100644
index 18281617c..000000000
--- a/audio/transcribe/src/packet.rs
+++ /dev/null
@@ -1,179 +0,0 @@
-// Copyright (C) 2020 Jordan Petridis <jordan@centricular.com>
-//
-// This library is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Library General Public
-// License as published by the Free Software Foundation; either
-// version 2 of the License, or (at your option) any later version.
-//
-// This library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-// Library General Public License for more details.
-//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the
-// Free Software Foundation, Inc., 51 Franklin Street, Suite 500,
-// Boston, MA 02110-1335, USA.
-
-use byteorder::{BigEndian, WriteBytesExt};
-use crc::crc32;
-use nom::{
-    self, bytes::complete::take, combinator::map_res, multi::many0, number::complete::be_u16,
-    number::complete::be_u32, number::complete::be_u8, sequence::tuple, IResult,
-};
-use std::borrow::Cow;
-use std::io::{self, Write};
-
-#[derive(Debug)]
-struct Prelude {
-    total_bytes: u32,
-    header_bytes: u32,
-    prelude_crc: u32,
-}
-
-#[derive(Debug)]
-pub struct Header {
-    pub name: Cow<'static, str>,
-    pub value_type: u8,
-    pub value: Cow<'static, str>,
-}
-
-#[derive(Debug)]
-pub struct Packet<'a> {
-    prelude: Prelude,
-    headers: Vec<Header>,
-    pub payload: &'a [u8],
-    msg_crc: u32,
-}
-
-fn write_header<W: Write>(w: &mut W, header: &Header) -> Result<(), io::Error> {
-    w.write_u8(header.name.len() as u8)?;
-    w.write_all(header.name.as_bytes())?;
-    w.write_u8(header.value_type)?;
-    w.write_u16::<BigEndian>(header.value.len() as u16)?;
-    w.write_all(header.value.as_bytes())?;
-    Ok(())
-}
-
-fn write_headers<W: Write>(w: &mut W, headers: &[Header]) -> Result<(), io::Error> {
-    for header in headers {
-        write_header(w, header)?;
-    }
-    Ok(())
-}
-
-pub fn encode_packet(payload: &[u8], headers: &[Header]) -> Result<Vec<u8>, io::Error> {
-    let mut res = Vec::with_capacity(1024);
-
-    // Total length
-    res.write_u32::<BigEndian>(0)?;
-    // Header length
-    res.write_u32::<BigEndian>(0)?;
-    // Prelude CRC32 placeholder
-    res.write_u32::<BigEndian>(0)?;
-
-    // Write all headers
-    write_headers(&mut res, headers)?;
-
-    // Rewrite header length
-    let header_length = res.len() - 12;
-    (&mut res[4..8]).write_u32::<BigEndian>(header_length as u32)?;
-
-    // Write payload
-    res.write_all(payload)?;
-
-    // Rewrite total length
-    let total_length = res.len() + 4;
-    (&mut res[0..4]).write_u32::<BigEndian>(total_length as u32)?;
-
-    // Rewrite the prelude crc since we replaced the lengths
-    let prelude_crc = crc32::checksum_ieee(&res[0..8]);
-    (&mut res[8..12]).write_u32::<BigEndian>(prelude_crc)?;
-
-    // Message CRC
-    let message_crc = crc32::checksum_ieee(&res);
-    res.write_u32::<BigEndian>(message_crc)?;
-
-    Ok(res)
-}
-
-fn parse_prelude(input: &[u8]) -> IResult<&[u8], Prelude> {
-    map_res(
-        tuple((be_u32, be_u32, be_u32)),
-        |(total_bytes, header_bytes, prelude_crc)| {
-            let sum = crc32::checksum_ieee(&input[0..8]);
-            if prelude_crc != sum {
-                return Err(nom::Err::Error((
-                    "Prelude CRC doesn't match",
-                    nom::error::ErrorKind::MapRes,
-                )));
-            }
-
-            Ok(Prelude {
-                total_bytes,
-                header_bytes,
-                prelude_crc,
-            })
-        },
-    )(input)
-}
-
-fn parse_header(input: &[u8]) -> IResult<&[u8], Header> {
-    let (input, header_length) = be_u8(input)?;
-    let (input, name) = map_res(take(header_length), std::str::from_utf8)(input)?;
-    let (input, value_type) = be_u8(input)?;
-    let (input, value_length) = be_u16(input)?;
-    let (input, value) = map_res(take(value_length), std::str::from_utf8)(input)?;
-
-    let header = Header {
-        name: name.to_string().into(),
-        value_type,
-        value: value.to_string().into(),
-    };
-
-    Ok((input, header))
-}
-
-pub fn packet_is_exception(packet: &Packet) -> bool {
-    for header in &packet.headers {
-        if header.name == ":message-type" && header.value == "exception" {
-            return true;
-        }
-    }
-
-    false
-}
-
-pub fn parse_packet(input: &[u8]) -> IResult<&[u8], Packet> {
-    let (remainder, prelude) = parse_prelude(input)?;
-
-    // Check the crc of the whole input
-    let sum = crc32::checksum_ieee(&input[..input.len() - 4]);
-    let (_, msg_crc) = be_u32(&input[input.len() - 4..])?;
-
-    if msg_crc != sum {
-        return Err(nom::Err::Error((
-            b"Prelude CRC doesn't match",
-            nom::error::ErrorKind::MapRes,
-        )));
-    }
-
-    let (remainder, header_input) = take(prelude.header_bytes)(remainder)?;
-    let (_, headers) = many0(parse_header)(header_input)?;
-
-    let payload_length = prelude.total_bytes - prelude.header_bytes - 4 - 12;
-    let (remainder, payload) = take(payload_length)(remainder)?;
-
-    // only the message_crc we check before should be remaining now
-    assert_eq!(remainder.len(), 4);
-
-    Ok((
-        input,
-        Packet {
-            prelude,
-            headers,
-            payload,
-            msg_crc,
-        },
-    ))
-}