feat(vertexai): Add flutter_soloud for sound output in Live API audio streaming example. #17305
Clean up before review
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2025 Google LLC | ||
| // | ||
| // 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. | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:record/record.dart'; | ||
| import 'dart:typed_data'; | ||
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| class AudioInput extends ChangeNotifier { | ||
| final _recorder = AudioRecorder(); | ||
| final AudioEncoder _encoder = AudioEncoder.pcm16bits; | ||
| bool isRecording = false; | ||
| bool isPaused = false; | ||
| Stream<Uint8List>? audioStream; | ||
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| Future<void> init() async { | ||
| await checkPermission(); | ||
| } | ||
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| @override | ||
| void dispose() { | ||
| _recorder.dispose(); | ||
| super.dispose(); | ||
| } | ||
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| Future<void> checkPermission() async { | ||
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| final hasPermission = await _recorder.hasPermission(); | ||
| if (!hasPermission) { | ||
| throw MicrophonePermissionDeniedException( | ||
| 'App does not have mic permissions', | ||
| ); | ||
| } | ||
| } | ||
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| Future<Stream<Uint8List>?> startRecordingStream() async { | ||
| var recordConfig = RecordConfig( | ||
| encoder: _encoder, | ||
| sampleRate: 24000, | ||
| numChannels: 1, | ||
| echoCancel: true, | ||
| noiseSuppress: true, | ||
| androidConfig: const AndroidRecordConfig( | ||
| audioSource: AndroidAudioSource.voiceCommunication, | ||
| ), | ||
| iosConfig: const IosRecordConfig(categoryOptions: []), | ||
| ); | ||
| await _recorder.listInputDevices(); | ||
| audioStream = await _recorder.startStream(recordConfig); | ||
| isRecording = true; | ||
| notifyListeners(); | ||
| return audioStream; | ||
| } | ||
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| Future<void> stopRecording() async { | ||
| await _recorder.stop(); | ||
| isRecording = false; | ||
| notifyListeners(); | ||
| } | ||
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| Future<void> togglePause() async { | ||
| if (isPaused) { | ||
| await _recorder.resume(); | ||
| isPaused = false; | ||
| } else { | ||
| await _recorder.pause(); | ||
| isPaused = true; | ||
| } | ||
| notifyListeners(); | ||
| return; | ||
| } | ||
| } | ||
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| /// An exception thrown when microphone permission is denied or not granted. | ||
| class MicrophonePermissionDeniedException implements Exception { | ||
| /// The optional message associated with the permission denial. | ||
| final String? message; | ||
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| /// Creates a new [MicrophonePermissionDeniedException] with an optional [message]. | ||
| MicrophonePermissionDeniedException([this.message]); | ||
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| @override | ||
| String toString() { | ||
| return 'MicrophonePermissionDeniedException: $message'; | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,66 @@ | ||
| // Copyright 2025 Google LLC | ||
| // | ||
| // 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. | ||
|
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| import 'dart:typed_data'; | ||
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| import 'package:flutter_soloud/flutter_soloud.dart'; | ||
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| class AudioOutput { | ||
| AudioSource? stream; // Start playback | ||
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| SoundHandle? handle; | ||
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| Future<void> init() async { | ||
| /// Initialize the player. | ||
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| await SoLoud.instance.init(sampleRate: 24000, channels: Channels.mono); | ||
| await setupNewStream(); | ||
| } | ||
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| Future<void> setupNewStream() async { | ||
| if (SoLoud.instance.isInitialized) { | ||
| // Stop and clear any previous playback handle if it's still valid | ||
| await stopStream(); // Ensure previous sound is stopped | ||
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| stream = SoLoud.instance.setBufferStream( | ||
| maxBufferSizeBytes: | ||
| 1024 * 1024 * 10, // 10MB of max buffer (not allocated) | ||
| bufferingType: BufferingType.released, | ||
| bufferingTimeNeeds: 0, | ||
| onBuffering: (isBuffering, handle, time) {}, | ||
| ); | ||
| // Reset handle to null until the stream is played again | ||
| handle = null; | ||
| } | ||
| } | ||
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| Future<AudioSource?> playStream() async { | ||
| handle = await SoLoud.instance.play(stream!); | ||
| return stream; | ||
| } | ||
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| Future<void> stopStream() async { | ||
| if (stream != null && | ||
| handle != null && | ||
| SoLoud.instance.getIsValidVoiceHandle(handle!)) { | ||
| SoLoud.instance.setDataIsEnded(stream!); | ||
| await SoLoud.instance.stop(handle!); | ||
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| // Clear old stream, set up new session for next time. | ||
| await setupNewStream(); | ||
| } | ||
| } | ||
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| void addAudioStream(Uint8List audioChunk) { | ||
| SoLoud.instance.addAudioDataStream(stream!, audioChunk); | ||
| } | ||
| } | ||
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