Simple rendering of voice messages in the timeline

Fixes https://github.com/vector-im/element-web/issues/17138

src/components/views/messages/MVoiceMessageBody.tsx

@@ -0,0 +1,106 @@
+/*
+Copyright 2021 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import React from "react";
+import {MatrixEvent} from "matrix-js-sdk/src/models/event";
+import {replaceableComponent} from "../../../utils/replaceableComponent";
+import {Playback} from "../../../voice/Playback";
+import MFileBody from "./MFileBody";
+import InlineSpinner from '../elements/InlineSpinner';
+import {_t} from "../../../languageHandler";
+import {mediaFromContent} from "../../../customisations/Media";
+import {decryptFile} from "../../../utils/DecryptFile";
+import RecordingPlayback from "../voice_messages/RecordingPlayback";
+
+interface IProps {
+    mxEvent: MatrixEvent;
+}
+
+interface IState {
+    error?: Error;
+    playback?: Playback;
+    decryptedBlob?: Blob;
+}
+
+@replaceableComponent("views.messages.MVoiceMessageBody")
+export default class MVoiceMessageBody extends React.PureComponent<IProps, IState> {
+    constructor(props: IProps) {
+        super(props);
+
+        this.state = {};
+    }
+
+    public async componentDidMount() {
+        let buffer: ArrayBuffer;
+        const content = this.props.mxEvent.getContent();
+        const media = mediaFromContent(content);
+        if (media.isEncrypted) {
+            try {
+                const blob = await decryptFile(content.file);
+                buffer = await blob.arrayBuffer();
+                this.setState({decryptedBlob: blob});
+            } catch (e) {
+                this.setState({error: e});
+                console.warn("Unable to decrypt voice message", e);
+                return; // stop processing the audio file
+            }
+        } else {
+            try {
+                buffer = await media.downloadSource().then(r => r.blob()).then(r => r.arrayBuffer());
+            } catch (e) {
+                this.setState({error: e});
+                console.warn("Unable to download voice message", e);
+                return; // stop processing the audio file
+            }
+        }
+
+        const waveform = content?.["org.matrix.msc1767.audio"]?.waveform?.map(p => p / 1024);
+
+        // We should have a buffer to work with now: let's set it up
+        const playback = new Playback(buffer, waveform);
+        this.setState({playback});
+        // Note: the RecordingPlayback component will handle preparing the Playback class for us.
+    }
+
+    public render() {
+        if (this.state.error) {
+            // TODO: @@TR: Verify error state
+            return (
+                <span className="mx_MVoiceMessageBody">
+                    <img src={require("../../../../res/img/warning.svg")} width="16" height="16" />
+                    { _t("Error processing voice message") }
+                </span>
+            );
+        }
+
+        if (!this.state.playback) {
+            // TODO: @@TR: Verify loading/decrypting state
+            return (
+                <span className="mx_MVoiceMessageBody">
+                    <InlineSpinner />
+                </span>
+            );
+        }
+
+        // At this point we should have a playable state
+        return (
+            <span className="mx_MVoiceMessageBody">
+                <RecordingPlayback playback={this.state.playback} />
+                <MFileBody {...this.props} decryptedBlob={this.state.decryptedBlob} showGenericPlaceholder={false} />
+            </span>
+        )
+    }
+}