freezer/lib/api/url_audio_source.dart

import 'package:freezer/api/definitions.dart';
import 'package:just_audio/just_audio.dart';
import 'package:http/http.dart' as http;

import 'deezer.dart';

class UrlAudioSource extends StreamAudioSource {
  final Uri uri;
  final StreamInfoCallback? onStreamObtained;
  UrlAudioSource(this.uri, {this.onStreamObtained});

  @override
  Future<StreamAudioResponse> request([int? start, int? end]) async {
    final req = http.Request('GET', uri)
      ..headers.addAll({
        'User-Agent': deezerAPI.headers['User-Agent']!,
        'Accept-Language': '*',
        'Accept': '*/*',
        if (start != null || end != null)
          "Range":
              "bytes=${start == null ? '' : start.toString()}-${end == null ? '' : end.toString()}"
      });

    final res = await req.send();

    onStreamObtained?.call(StreamQualityInfo(
        format: Format.MP3,
        source: Source.stream,
        quality: null,
        size: res.contentLength! + (start ?? 0)));

    return StreamAudioResponse(
        sourceLength: res.contentLength! + (start ?? 0),
        contentLength: res.contentLength!,
        offset: start,
        stream: res.stream,
        contentType: res.headers['content-type']!);
  }
}