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Merge pull request #1330 from litetex/speed-up-n-parameter-extraction

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[YouTube] Speed up n parameter presence check
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Tobi 2025-07-12 05:10:49 -07:00 committed by GitHub
commit c0ff21af93
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extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingParameterUtils.java
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@ -18,6 +18,8 @@ import java.util.regex.Pattern;
*/ */
final class YoutubeThrottlingParameterUtils { final class YoutubeThrottlingParameterUtils {
// NOTE: When changing this you should also change the quick exit/shortcut
// in getThrottlingParameterFromStreamingUrl
private static final Pattern THROTTLING_PARAM_PATTERN = Pattern.compile("[&?]n=([^&]+)"); private static final Pattern THROTTLING_PARAM_PATTERN = Pattern.compile("[&?]n=([^&]+)");
private static final String SINGLE_CHAR_VARIABLE_REGEX = "[a-zA-Z0-9$_]"; private static final String SINGLE_CHAR_VARIABLE_REGEX = "[a-zA-Z0-9$_]";
@ -203,6 +205,11 @@ final class YoutubeThrottlingParameterUtils {
*/ */
@Nullable @Nullable
static String getThrottlingParameterFromStreamingUrl(@Nonnull final String streamingUrl) { static String getThrottlingParameterFromStreamingUrl(@Nonnull final String streamingUrl) {
// Do a quick check if the n parameter is even present, if not abort
// This improves performance by 60-900x
if (!streamingUrl.contains("&n=") && !streamingUrl.contains("?n=")) {
return null;
}
try { try {
return Parser.matchGroup1(THROTTLING_PARAM_PATTERN, streamingUrl); return Parser.matchGroup1(THROTTLING_PARAM_PATTERN, streamingUrl);
} catch (final Parser.RegexException e) { } catch (final Parser.RegexException e) {