bmff
library
Classes
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AsyncBmff
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import 'package:bmff/bmff.dart';
import 'package:http/http.dart' as http;
Future<void> main(List<String> args) async {
// final uri = Uri.parse('https://www.w3school.com.cn/i/movie.mp4');
final uri = Uri.parse(
'http://vfx.mtime.cn/Video/2019/03/18/mp4/190318231014076505.mp4');
final bmff = await Bmff.asyncContext(AsyncBmffContextHttp(uri));
for (final box in bmff.childBoxes) {
showBoxInfo(0, box);
}
}
void showBoxInfo(int level, AsyncBmffBox box) {
final levelPrefix = ' ' * level;
print('$levelPrefix${box.type} ${box.realSize}');
for (final child in box.childBoxes) {
showBoxInfo(level + 1, child);
}
}
// part download http context
class AsyncBmffContextHttp extends AsyncBmffContext {
final Uri uri;
const AsyncBmffContextHttp(this.uri);
@override
Future<List<int>> getRangeData(int start, int end) async {
final response = await http.get(uri, headers: {
'Range': 'bytes=$start-${end - 1}',
});
if (response.statusCode != 206) {
throw Exception(
'Current http status code is ${response.statusCode}, not 206, not support range download');
}
final bytes = response.bodyBytes;
return bytes;
}
@override
Future<int> lengthAsync() async {
final response = await http.head(uri);
final contentLength = response.headers['content-length'];
if (contentLength != null) {
return int.parse(contentLength);
} else {
throw Exception('content-length not found');
}
}
}
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AsyncBmffBox
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{@template bmff.bmff_box_base}
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AsyncBmffContext
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The async context of a BMFF file.
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AsyncFtypBox
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BaseBmffContext
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Some base configurations.
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Bmff
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The BMFF library.
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BmffBox
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A base class for all BMFF boxes.
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BmffContext
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The context of a BMFF file.
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BmffMemoryContext
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The context of a BMFF file in memory.
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BoxContainer
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Container of BmffBox.
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FtypBox
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The file type box.
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MemoryAsyncBmffContext
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The context of a BMFF file in memory.
