57 lines
1.7 KiB
Dart
57 lines
1.7 KiB
Dart
import 'dart:typed_data';
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import 'package:just_audio/just_audio.dart';
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/// A [StreamAudioSource] that plays audio from raw bytes in memory.
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///
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/// This is useful for playing audio data that has been loaded from a network
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/// response or other byte stream, such as server-side TTS audio.
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///
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/// Example:
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/// ```dart
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/// final audioPlayer = AudioPlayer();
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/// final audioBytes = Uint8List.fromList([...]);
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/// await audioPlayer.setAudioSource(
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/// BytesAudioSource(audioBytes, 'audio/mpeg'),
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/// );
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/// await audioPlayer.play();
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/// ```
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class BytesAudioSource extends StreamAudioSource {
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/// Creates a [BytesAudioSource] from the given bytes and MIME type.
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///
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/// The [mimeType] should be a valid audio MIME type such as:
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/// - `audio/mpeg` for MP3
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/// - `audio/wav` for WAV
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/// - `audio/mp4` or `audio/aac` for AAC/M4A
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/// - `audio/ogg` for Ogg Vorbis
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BytesAudioSource(this._bytes, this._mimeType);
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final Uint8List _bytes;
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final String _mimeType;
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@override
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Future<StreamAudioResponse> request([int? start, int? end]) async {
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start ??= 0;
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end ??= _bytes.length;
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// Assert valid bounds in debug mode to catch bugs early, but don't
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// crash in release. just_audio should always pass valid ranges.
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assert(
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start >= 0 && start <= _bytes.length,
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'BytesAudioSource: start ($start) out of bounds [0, ${_bytes.length}]',
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);
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assert(
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end >= start && end <= _bytes.length,
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'BytesAudioSource: end ($end) out of bounds [$start, ${_bytes.length}]',
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);
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return StreamAudioResponse(
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sourceLength: _bytes.length,
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contentLength: end - start,
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offset: start,
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stream: Stream.value(_bytes.sublist(start, end)),
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contentType: _mimeType,
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);
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}
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}
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