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import { Button } from "@/components/ui/button";
import { PanelView } from "@/components/editor/panels/assets/views/base-panel";
import {
Select,
SelectContent,
SelectItem,
SelectTrigger,
SelectValue,
} from "@/components/ui/select";
import { useState, useRef } from "react";
import { extractTimelineAudio } from "@/lib/media/mediabunny";
import { useEditor } from "@/hooks/use-editor";
import {
DEFAULT_TRANSCRIPTION_SAMPLE_RATE,
TRANSCRIPTION_LANGUAGES,
} from "@/constants/transcription-constants";
import type {
TranscriptionLanguage,
TranscriptionProgress,
} from "@/lib/transcription/types";
import { transcriptionService } from "@/services/transcription/service";
import { decodeAudioToFloat32 } from "@/lib/media/audio";
import { buildCaptionChunks } from "@/lib/transcription/caption";
import { Spinner } from "@/components/ui/spinner";
import {
Section,
SectionContent,
SectionField,
SectionFields,
} from "@/components/section";
import { DEFAULTS } from "@/lib/timeline/defaults";
import {
AddTrackCommand,
BatchCommand,
InsertElementCommand,
} from "@/lib/commands";
export function Captions() {
const [selectedLanguage, setSelectedLanguage] =
useState<TranscriptionLanguage>("auto");
const [isProcessing, setIsProcessing] = useState(false);
const [processingStep, setProcessingStep] = useState("");
const [error, setError] = useState<string | null>(null);
const containerRef = useRef<HTMLDivElement>(null);
const editor = useEditor();
const handleProgress = (progress: TranscriptionProgress) => {
if (progress.status === "loading-model") {
setProcessingStep(`Loading model ${Math.round(progress.progress)}%`);
} else if (progress.status === "transcribing") {
setProcessingStep("Transcribing...");
}
};
const handleGenerateTranscript = async () => {
try {
setIsProcessing(true);
setError(null);
setProcessingStep("Extracting audio...");
const audioBlob = await extractTimelineAudio({
tracks: editor.timeline.getTracks(),
mediaAssets: editor.media.getAssets(),
totalDuration: editor.timeline.getTotalDuration(),
});
setProcessingStep("Preparing audio...");
const { samples } = await decodeAudioToFloat32({
audioBlob,
sampleRate: DEFAULT_TRANSCRIPTION_SAMPLE_RATE,
});
const result = await transcriptionService.transcribe({
audioData: samples,
language: selectedLanguage === "auto" ? undefined : selectedLanguage,
onProgress: handleProgress,
});
setProcessingStep("Generating captions...");
const captionChunks = buildCaptionChunks({ segments: result.segments });
const addTrackCommand = new AddTrackCommand("text", 0);
const insertCommands = captionChunks.map(
(caption, i) =>
new InsertElementCommand({
placement: {
mode: "explicit",
trackId: addTrackCommand.getTrackId(),
},
element: {
...DEFAULTS.text.element,
name: `Caption ${i + 1}`,
content: caption.text,
duration: caption.duration,
startTime: caption.startTime,
fontSize: 65,
fontWeight: "bold",
},
}),
);
editor.command.execute({
command: new BatchCommand([addTrackCommand, ...insertCommands]),
});
} catch (error) {
console.error("Transcription failed:", error);
setError(
error instanceof Error ? error.message : "An unexpected error occurred",
);
} finally {
setIsProcessing(false);
setProcessingStep("");
}
};
const handleLanguageChange = ({ value }: { value: string }) => {
if (value === "auto") {
setSelectedLanguage("auto");
return;
}
const matchedLanguage = TRANSCRIPTION_LANGUAGES.find(
(language) => language.code === value,
);
if (!matchedLanguage) return;
setSelectedLanguage(matchedLanguage.code);
};
return (
<PanelView
title="Captions"
contentClassName="px-0 flex flex-col h-full"
ref={containerRef}
>
<Section showTopBorder={false} showBottomBorder={false} className="flex-1">
<SectionContent className="flex flex-col gap-4 h-full pt-1">
<SectionFields>
<SectionField label="Language">
<Select
value={selectedLanguage}
onValueChange={(value) => handleLanguageChange({ value })}
>
<SelectTrigger>
<SelectValue placeholder="Select a language" />
</SelectTrigger>
<SelectContent>
<SelectItem value="auto">Auto detect</SelectItem>
{TRANSCRIPTION_LANGUAGES.map((language) => (
<SelectItem key={language.code} value={language.code}>
{language.name}
</SelectItem>
))}
</SelectContent>
</Select>
</SectionField>
</SectionFields>
{error && (
<div className="bg-destructive/10 border-destructive/20 rounded-md border p-3">
<p className="text-destructive text-sm">{error}</p>
</div>
)}
</SectionContent>
</Section>
<Section showBottomBorder={false} showTopBorder={false}>
<SectionContent>
<Button
className="w-full"
onClick={handleGenerateTranscript}
disabled={isProcessing}
>
{isProcessing && <Spinner className="mr-1" />}
{isProcessing ? processingStep : "Generate transcript"}
</Button>
</SectionContent>
</Section>
</PanelView>
);
}
|
