audio_codec 0.0.2

A library to decode and perhaps encode audios

audio_codecs

A Dart library for decoding (and potentially encoding) audio files. This package provides a convenient way to work with various audio codecs within your Dart and Flutter applications.

Codecs Support

Codec	Decoding Status	Encoding Status	Notes
FLAC	Good	-	Decoding is functional, may have some minor audio glitches.
MP3	-	-	Not yet implemented.
OPUS	-	-	Not yet implemented.
WAV	-	Good	Writing is supported.
PCM	Excellent	Excellent

Status Levels

The "Status" column in the Codecs table uses the following quality indicators:

Status	Description
-	Not started yet.
Passable	The codec is partially implemented. For decoding, this might mean the file can be decoded, but with issues.
Good	The codec is mostly functional. For decoding, it might mean files can be decoded but with some audible glitches.
Excellent	The codec is fully implemented and considered stable. For decoding, it means no audible glitches.

Installation

Add audio_codecs to your pubspec.yaml:

dependencies:
  audio_codecs: ^0.0.1

copied to clipboard

Then, run:

dart pub get

copied to clipboard

Usage

import 'dart:io';
import 'dart:typed_data';

import 'package:audio_codec/src/flac/flac_decoder.dart';
import 'package:audio_codec/src/wav/wav_encoder.dart';

void main() {
  final flacFile = File('test.flac');

  final decoder = FlacDecoder(track: flacFile);
  final result = decoder.decode();

  final pcmSamples = Int32List(
    result.streamInfoBlock!.totalSamples * result.streamInfoBlock!.channels,
  );

  int frameNumber = 0;

  while (decoder.hasNextFrame()) {
    final frame = decoder.readFrame();

    writeFrameToPcm(
      pcmSamples,
      frame,
      frameNumber,
      result.streamInfoBlock!.sampleRate,
    );

    frameNumber++;
  }

  decoder.close();

  WavEncoder(
    sampleRate: result.streamInfoBlock!.sampleRate,
    numChannels: result.streamInfoBlock!.channels,
    bitDepth: result.streamInfoBlock!.bitsPerSample,
  ).encode(
    File("output.wav"),
    pcmSamples,
  );
}

copied to clipboard