element-web/test/unit-tests/voice-broadcast/audio/VoiceBroadcastRecorder-test.ts

/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import { mocked } from "jest-mock";
import { Optional } from "matrix-events-sdk";

import { VoiceRecording } from "../../../../src/audio/VoiceRecording";
import SdkConfig from "../../../../src/SdkConfig";
import { concat } from "../../../../src/utils/arrays";
import {
    ChunkRecordedPayload,
    createVoiceBroadcastRecorder,
    VoiceBroadcastRecorder,
    VoiceBroadcastRecorderEvent,
} from "../../../../src/voice-broadcast";

// mock VoiceRecording because it contains all the audio APIs
jest.mock("../../../../src/audio/VoiceRecording", () => ({
    VoiceRecording: jest.fn().mockReturnValue({
        disableMaxLength: jest.fn(),
        emit: jest.fn(),
        liveData: {
            onUpdate: jest.fn(),
        },
        start: jest.fn(),
        stop: jest.fn(),
        destroy: jest.fn(),
    }),
}));

jest.mock("../../../../src/settings/SettingsStore");

describe("VoiceBroadcastRecorder", () => {
    describe("createVoiceBroadcastRecorder", () => {
        beforeEach(() => {
            jest.spyOn(SdkConfig, "get").mockImplementation((key: string) => {
                if (key === "voice_broadcast") {
                    return {
                        chunk_length: 1337,
                    };
                }
            });
        });

        afterEach(() => {
            mocked(SdkConfig.get).mockRestore();
        });

        it("should return a VoiceBroadcastRecorder instance with targetChunkLength from config", () => {
            const voiceBroadcastRecorder = createVoiceBroadcastRecorder();
            expect(voiceBroadcastRecorder).toBeInstanceOf(VoiceBroadcastRecorder);
            expect(voiceBroadcastRecorder.targetChunkLength).toBe(1337);
        });
    });

    describe("instance", () => {
        const chunkLength = 30;
        // 0... OpusHead
        const headers1 = new Uint8Array([...Array(28).fill(0), 79, 112, 117, 115, 72, 101, 97, 100]);
        // 0... OpusTags
        const headers2 = new Uint8Array([...Array(28).fill(0), 79, 112, 117, 115, 84, 97, 103, 115]);
        const chunk1 = new Uint8Array([5, 6]);
        const chunk2a = new Uint8Array([7, 8]);
        const chunk2b = new Uint8Array([9, 10]);
        const contentType = "test content type";

        let voiceRecording: VoiceRecording;
        let voiceBroadcastRecorder: VoiceBroadcastRecorder;
        let onChunkRecorded: (chunk: ChunkRecordedPayload) => void;

        const simulateFirstChunk = (): void => {
            // send headers in wrong order and multiple times to test robustness for that
            voiceRecording.onDataAvailable!(headers2);
            voiceRecording.onDataAvailable!(headers1);
            voiceRecording.onDataAvailable!(headers1);
            voiceRecording.onDataAvailable!(headers2);
            // set recorder seconds to something greater than the test chunk length of 30
            // @ts-ignore
            voiceRecording.recorderSeconds = 42;
            voiceRecording.onDataAvailable!(chunk1);
            voiceRecording.onDataAvailable!(headers1);
        };

        const expectOnFirstChunkRecorded = (): void => {
            expect(onChunkRecorded).toHaveBeenNthCalledWith(1, {
                buffer: concat(headers1, headers2, chunk1),
                length: 42,
            });
        };

        const itShouldNotEmitAChunkRecordedEvent = (): void => {
            it("should not emit a ChunkRecorded event", (): void => {
                expect(voiceRecording.emit).not.toHaveBeenCalledWith(
                    VoiceBroadcastRecorderEvent.ChunkRecorded,
                    expect.anything(),
                );
            });
        };

        beforeEach(() => {
            voiceRecording = new VoiceRecording();
            // @ts-ignore
            voiceRecording.recorderSeconds = 23;
            // @ts-ignore
            voiceRecording.contentType = contentType;

            voiceBroadcastRecorder = new VoiceBroadcastRecorder(voiceRecording, chunkLength);
            jest.spyOn(voiceBroadcastRecorder, "removeAllListeners");
            onChunkRecorded = jest.fn();
            voiceBroadcastRecorder.on(VoiceBroadcastRecorderEvent.ChunkRecorded, onChunkRecorded);
        });

        afterEach(() => {
            voiceBroadcastRecorder.destroy();
        });

        it("start should forward the call to VoiceRecording.start", async () => {
            await voiceBroadcastRecorder.start();
            expect(voiceRecording.start).toHaveBeenCalled();
        });

        describe("stop", () => {
            beforeEach(async () => {
                await voiceBroadcastRecorder.stop();
            });

            it("should forward the call to VoiceRecording.stop", async () => {
                expect(voiceRecording.stop).toHaveBeenCalled();
            });

            itShouldNotEmitAChunkRecordedEvent();
        });

        describe("when calling destroy", () => {
            beforeEach(() => {
                voiceBroadcastRecorder.destroy();
            });

            it("should call VoiceRecording.destroy", () => {
                expect(voiceRecording.destroy).toHaveBeenCalled();
            });

            it("should remove all listeners", () => {
                expect(voiceBroadcastRecorder.removeAllListeners).toHaveBeenCalled();
            });
        });

        it("contentType should return the value from VoiceRecording", () => {
            expect(voiceBroadcastRecorder.contentType).toBe(contentType);
        });

        describe("when the first header from recorder has been received", () => {
            beforeEach(() => {
                voiceRecording.onDataAvailable!(headers1);
            });

            itShouldNotEmitAChunkRecordedEvent();
        });

        describe("when the second header from recorder has been received", () => {
            beforeEach(() => {
                voiceRecording.onDataAvailable!(headers1);
                voiceRecording.onDataAvailable!(headers2);
            });

            itShouldNotEmitAChunkRecordedEvent();
        });

        describe("when a third page from recorder has been received", () => {
            beforeEach(() => {
                voiceRecording.onDataAvailable!(headers1);
                voiceRecording.onDataAvailable!(headers2);
                voiceRecording.onDataAvailable!(chunk1);
            });

            itShouldNotEmitAChunkRecordedEvent();

            describe("and calling stop", () => {
                let stopPayload: Optional<ChunkRecordedPayload>;

                beforeEach(async () => {
                    stopPayload = await voiceBroadcastRecorder.stop();
                });

                it("should return the remaining chunk", () => {
                    expect(stopPayload).toEqual({
                        buffer: concat(headers1, headers2, chunk1),
                        length: 23,
                    });
                });

                describe("and calling start again and receiving some data", () => {
                    beforeEach(() => {
                        simulateFirstChunk();
                    });

                    it("should emit the ChunkRecorded event for the first chunk", () => {
                        expectOnFirstChunkRecorded();
                    });
                });
            });

            describe("and calling stop() with recording.stop error)", () => {
                let stopPayload: Optional<ChunkRecordedPayload>;

                beforeEach(async () => {
                    mocked(voiceRecording.stop).mockRejectedValue("Error");
                    stopPayload = await voiceBroadcastRecorder.stop();
                });

                it("should return the remaining chunk", () => {
                    expect(stopPayload).toEqual({
                        buffer: concat(headers1, headers2, chunk1),
                        length: 23,
                    });
                });
            });
        });

        describe("when some chunks have been received", () => {
            beforeEach(() => {
                simulateFirstChunk();

                // simulate a second chunk
                voiceRecording.onDataAvailable!(chunk2a);

                // send headers again to test robustness for that
                voiceRecording.onDataAvailable!(headers2);

                // add another 30 seconds for the next chunk
                // @ts-ignore
                voiceRecording.recorderSeconds = 72;
                voiceRecording.onDataAvailable!(chunk2b);
            });

            it("should emit ChunkRecorded events", () => {
                expectOnFirstChunkRecorded();

                expect(onChunkRecorded).toHaveBeenNthCalledWith(2, {
                    buffer: concat(headers1, headers2, chunk2a, chunk2b),
                    length: 72 - 42, // 72 (position at second chunk) - 42 (position of first chunk)
                });
            });
        });
    });
});