baremetal_audio 1.0.0 
baremetal_audio: ^1.0.0 copied to clipboard
A high-performance, lock-free audio DSP engine using C++17 and Miniaudio via Dart FFI.
example/lib/main.dart
// ignore_for_file: deprecated_member_use
import 'dart:async';
import 'dart:ffi' as ffi;
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:baremetal_audio/baremetal_audio.dart';
void main() {
runApp(const MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Baremetal Audio Demo',
themeMode: ThemeMode.dark,
home: BaremetalHome(),
));
}
class BaremetalHome extends StatelessWidget {
const BaremetalHome({super.key});
@override
Widget build(BuildContext context) {
return DefaultTabController(
length: 2,
child: Scaffold(
body: Container(
decoration: const BoxDecoration(
gradient: RadialGradient(
center: Alignment.topLeft,
radius: 1.5,
colors: [Color(0xFF1A1A2E), Color(0xFF000000)],
),
),
child: SafeArea(
child: Column(
children: [
_buildAppBar(),
const Expanded(
child: TabBarView(
children: [
CaptureTab(),
PlaybackTab(),
],
),
),
],
),
),
),
),
);
}
Widget _buildAppBar() {
return Container(
padding: const EdgeInsets.symmetric(vertical: 15, horizontal: 20),
decoration: BoxDecoration(
color: Colors.white.withOpacity(0.05),
border: const Border(bottom: BorderSide(color: Colors.white10)),
),
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
const Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text("BAREMETAL",
style: TextStyle(
color: Colors.cyanAccent,
fontWeight: FontWeight.w900,
letterSpacing: 2,
fontSize: 18)),
Text("AUDIO ENGINE",
style: TextStyle(
color: Colors.white70,
fontSize: 12,
letterSpacing: 4)),
],
),
Container(
padding:
const EdgeInsets.symmetric(horizontal: 10, vertical: 5),
decoration: BoxDecoration(
color: Colors.cyanAccent.withOpacity(0.1),
borderRadius: BorderRadius.circular(20),
border:
Border.all(color: Colors.cyanAccent.withOpacity(0.3))),
child: const Text("v1.0.0",
style: TextStyle(
color: Colors.cyanAccent,
fontSize: 10,
fontWeight: FontWeight.bold)),
)
],
),
const SizedBox(height: 15),
Container(
height: 45,
decoration: BoxDecoration(
color: Colors.black45,
borderRadius: BorderRadius.circular(25.0),
),
child: TabBar(
indicator: BoxDecoration(
borderRadius: BorderRadius.circular(25.0),
gradient: const LinearGradient(
colors: [Color(0xFF00C6FF), Color(0xFF0072FF)],
),
),
labelColor: Colors.white,
unselectedLabelColor: Colors.white54,
labelStyle: const TextStyle(fontWeight: FontWeight.bold),
tabs: const [
Tab(text: "LIVE CAPTURE"),
Tab(text: "SYNC PLAYER"),
],
),
),
],
),
);
}
}
// --- TAB 1: Microphone Visualizer ---
class CaptureTab extends StatefulWidget {
const CaptureTab({super.key});
@override
State<CaptureTab> createState() => _CaptureTabState();
}
class _CaptureTabState extends State<CaptureTab> {
bool _isRunning = false;
List<double> _fftData = [];
double _rms = 0.0;
Timer? _timer;
void _toggle() async {
if (_isRunning) {
// 1. Kill Timer FIRST to stop FFI calls
_timer?.cancel();
_timer = null;
// 2. Then stop engine
BaremetalAudio.stop();
setState(() => _isRunning = false);
} else {
if (await Permission.microphone.request().isGranted) {
BaremetalAudio.init(mode: EngineMode.capture);
_startTicker();
setState(() => _isRunning = true);
}
}
}
void _startTicker() {
_timer = Timer.periodic(const Duration(milliseconds: 16), (_) {
if (!mounted) return;
final ptr = BaremetalAudio.getFftArray();
if (ptr == ffi.nullptr) return;
setState(() {
_rms = BaremetalAudio.getRmsLevel();
_fftData = ptr.asTypedList(512).sublist(0, 128);
});
});
}
@override
void dispose() {
_timer?.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Column(
children: [
Expanded(
flex: 3,
child: Container(
margin: const EdgeInsets.fromLTRB(20, 20, 20, 0),
decoration: BoxDecoration(
color: const Color(0xFF0A0A0A),
borderRadius: BorderRadius.circular(24),
border: Border.all(color: Colors.white12),
boxShadow: [
BoxShadow(
color: _isRunning
? Colors.cyanAccent.withOpacity(0.1)
: Colors.transparent,
blurRadius: 20,
spreadRadius: 2,
)
],
),
child: ClipRRect(
borderRadius: BorderRadius.circular(24),
child: Stack(
children: [
CustomPaint(painter: GridPainter(), size: Size.infinite),
Padding(
padding: const EdgeInsets.only(bottom: 20),
child: CustomPaint(
painter: ProGradientSpectrumPainter(_fftData),
size: Size.infinite,
),
),
Positioned(
top: 20,
right: 20,
child: Container(
padding: const EdgeInsets.symmetric(
horizontal: 8, vertical: 4),
decoration: BoxDecoration(
color: _isRunning ? Colors.redAccent : Colors.grey,
borderRadius: BorderRadius.circular(4),
),
child: Text(
_isRunning ? "REC ●" : "IDLE",
style: const TextStyle(
color: Colors.white,
fontSize: 10,
fontWeight: FontWeight.bold),
),
),
),
],
),
),
),
),
Expanded(
flex: 1,
child: Container(
padding: const EdgeInsets.symmetric(horizontal: 30),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Row(
children: [
const Icon(Icons.volume_up,
color: Colors.white54, size: 20),
const SizedBox(width: 15),
Expanded(
child: ClipRRect(
borderRadius: BorderRadius.circular(4),
child: LinearProgressIndicator(
minHeight: 8,
value: _rms * 1.5,
backgroundColor: Colors.white10,
valueColor: AlwaysStoppedAnimation<Color>(
_rms > 0.8 ? Colors.redAccent : Colors.greenAccent,
),
),
),
),
],
),
const SizedBox(height: 25),
SizedBox(
width: double.infinity,
height: 55,
child: ElevatedButton(
onPressed: _toggle,
style: ElevatedButton.styleFrom(
backgroundColor: _isRunning
? Colors.redAccent.withOpacity(0.2)
: Colors.cyanAccent.withOpacity(0.2),
foregroundColor:
_isRunning ? Colors.redAccent : Colors.cyanAccent,
shadowColor: Colors.transparent,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(16),
side: BorderSide(
color:
_isRunning ? Colors.redAccent : Colors.cyanAccent,
width: 2,
),
),
),
child: Text(
_isRunning ? "STOP ENGINE" : "START CAPTURE",
style: const TextStyle(
fontSize: 16,
fontWeight: FontWeight.bold,
letterSpacing: 1),
),
),
),
],
),
),
),
],
);
}
}
// --- TAB 2: File Playback & Sync (Cinematic Style) ---
class PlaybackTab extends StatefulWidget {
const PlaybackTab({super.key});
@override
State<PlaybackTab> createState() => _PlaybackTabState();
}
class _PlaybackTabState extends State<PlaybackTab> {
bool _isRunning = false;
String _subtitle = ""; // متن خالی برای شروع
double _time = 0.0;
List<double> _fftData = [];
Timer? _timer;
// نمونه زیرنویس برای تست
final String _demoSrt = """
1
00:00:00,500 --> 00:00:02,500
[Baremetal Audio Engine]
2
00:00:02,600 --> 00:00:05,000
Testing Sample-Accurate Sync...
3
00:00:05,100 --> 00:00:08,000
C++ Backend: Miniaudio
Frontend: Dart FFI
4
00:00:08,100 --> 00:00:11,000
No MethodChannels.
Zero Latency.
""";
Future<void> _play() async {
if (_isRunning) {
_timer?.cancel();
_timer = null;
BaremetalAudio.stop();
setState(() {
_isRunning = false;
_subtitle = ""; // پاک کردن زیرنویس موقع استاپ
_time = 0.0;
});
return;
}
final tempDir = await getTemporaryDirectory();
final file = File('${tempDir.path}/test_audio.mp3');
if (await file.exists()) {
await file.delete();
}
try {
final data = await rootBundle.load('assets/test_audio.mp3');
await file.writeAsBytes(data.buffer.asUint8List(), flush: true);
} catch (e) {
if (!mounted) return;
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text("Asset 'test_audio.mp3' not found!")));
return;
}
if (!await file.exists()) return;
BaremetalAudio.init(mode: EngineMode.playback, filePath: file.path);
BaremetalAudio.loadSubtitles(_demoSrt);
_timer = Timer.periodic(const Duration(milliseconds: 16), (_) {
if (!mounted) return;
final ptr = BaremetalAudio.getFftArray();
List<double> currentFft = [];
if (ptr != ffi.nullptr) {
currentFft = ptr.asTypedList(512).sublist(0, 64);
}
setState(() {
_time = BaremetalAudio.getMediaTime();
_subtitle = BaremetalAudio.getCurrentSubtitle();
_fftData = currentFft;
});
});
setState(() => _isRunning = true);
}
@override
void dispose() {
_timer?.cancel();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Stack(
children: [
// 1. پسزمینه ویژوالایزر (پایین صفحه)
Positioned(
left: 0,
right: 0,
bottom: 0,
height: 300, // ارتفاع بیشتر برای جلوه بهتر
child: Opacity(
opacity: 0.3,
child: CustomPaint(
painter: ProGradientSpectrumPainter(_fftData, isMirror: true),
size: Size.infinite,
),
),
),
// 2. تایمر بزرگ در مرکز (مثل واترمارک)
Center(
child: Text(
_time.toStringAsFixed(2),
style: TextStyle(
fontSize: 100,
fontFamily: "Monospace",
color: Colors.white.withOpacity(0.05), // خیلی کمرنگ
fontWeight: FontWeight.w900,
),
),
),
// 3. دکمه Play/Pause (وسط صفحه)
Center(
child: IconButton(
onPressed: _play,
iconSize: 80,
icon: Icon(
_isRunning ? Icons.pause_circle_filled : Icons.play_circle_fill,
),
color: Colors.white.withOpacity(0.9),
tooltip: _isRunning ? "Stop" : "Play Demo",
),
),
// 4. زیرنویس سینمایی (پایین، وسط، فیکس شده)
Positioned(
left: 20,
right: 20,
bottom: 80, // فاصله از کف صفحه
child: SizedBox(
height: 100, // ارتفاع ثابت برای جلوگیری از پرش صفحه
child: AnimatedSwitcher(
duration: const Duration(milliseconds: 200), // تغییر نرم
transitionBuilder: (Widget child, Animation<double> animation) {
return FadeTransition(opacity: animation, child: child);
},
child: Text(
_subtitle,
// کلید یکتا برای اینکه انیمیشن بفهمد متن عوض شده
key: ValueKey<String>(_subtitle),
textAlign: TextAlign.center,
style: const TextStyle(
color: Colors.white,
fontSize: 22,
fontWeight: FontWeight.bold,
letterSpacing: 0.5,
height: 1.3,
shadows: [
// سایه برای خوانایی روی هر پسزمینه (Outline Effect)
Shadow(offset: Offset(-1, -1), color: Colors.black),
Shadow(offset: Offset(1, -1), color: Colors.black),
Shadow(offset: Offset(1, 1), color: Colors.black),
Shadow(offset: Offset(-1, 1), color: Colors.black),
Shadow(
blurRadius: 10,
color: Colors.black87,
offset: Offset(0, 4)),
],
),
),
),
),
),
],
);
}
}
// --- PAINTERS ---
class ProGradientSpectrumPainter extends CustomPainter {
final List<double> data;
final bool isMirror;
ProGradientSpectrumPainter(this.data, {this.isMirror = false});
@override
void paint(Canvas canvas, Size size) {
if (data.isEmpty) return;
final barWidth = size.width / data.length;
final paint = Paint()..style = PaintingStyle.fill;
for (int i = 0; i < data.length; i++) {
final magnitude = data[i] * 120.0;
final barHeight = (magnitude * size.height * 0.8).clamp(2.0, size.height);
final rect = Rect.fromLTWH(
i * barWidth, size.height - barHeight, barWidth * 0.6, barHeight);
paint.shader = const LinearGradient(
begin: Alignment.bottomCenter,
end: Alignment.topCenter,
colors: [Colors.purpleAccent, Colors.cyanAccent],
).createShader(rect);
canvas.drawRRect(
RRect.fromRectAndRadius(rect, const Radius.circular(4)),
paint,
);
}
}
@override
bool shouldRepaint(covariant ProGradientSpectrumPainter oldDelegate) => true;
}
class GridPainter extends CustomPainter {
@override
void paint(Canvas canvas, Size size) {
final paint = Paint()
..color = Colors.white.withOpacity(0.05)
..strokeWidth = 1;
for (double i = 0; i < size.height; i += 40) {
canvas.drawLine(Offset(0, i), Offset(size.width, i), paint);
}
}
@override
bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
}Metadata
3
likes
0
points
171
downloads
Publisher
unverified uploader
Weekly Downloads
Metadata
A high-performance, lock-free audio DSP engine using C++17 and Miniaudio via Dart FFI.
Repository (GitHub)
View/report issues
License
unknown (license)
Dependencies
equatable, ffi, flutter, flutter_bloc
More
Packages that depend on baremetal_audio
Packages that implement baremetal_audio
