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feat: qbz-1 streaming, gapless prefetch, accurate scrobbling, Range-seek

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Port proven playback architecture from qbqt fork:
- Bounded VecDeque buffer with condvar backpressure (4MB cap)
- decrypt_and_extract_frames for clean FLAC frame extraction from ISOBMFF
- Cancel+restart seeking with sub-segment sample skipping
- start_prefetch / QueueNext for gapless transitions with pre-started downloads
- track_transitioned signaling for scrobbler during gapless playback
- Range-request HTTP seeking for non-segmented (MP3) tracks
- OnceLock HTTP client singleton with cancel-aware chunked downloads
- Accumulated listening time scrobbling (prevents false scrobbles from seeking)
- Array-format Last.fm scrobble params (artist[0], track[0], etc.)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
joren
2026-03-30 20:12:23 +02:00
parent 6c8d032ce9
commit 70810bd4b1
16 changed files with 1539 additions and 382 deletions
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55
src/scrobbler/lastfm.hpp
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@@ -78,9 +78,11 @@ public slots:
m_artist = track["album"].toObject()["artist"].toObject()["name"].toString();
m_album = track["album"].toObject()["title"].toString();
m_duration = static_cast<qint64>(track["duration"].toDouble());
m_startTime = QDateTime::currentSecsSinceEpoch();
m_playedSecs = 0;
m_scrobbled = false;
m_startTime = QDateTime::currentSecsSinceEpoch();
m_playedSecs = 0;
m_lastPosition = 0;
m_accumulatedSecs = 0;
m_scrobbled = false;
if (!isEnabled() || m_title.isEmpty() || m_duration < 30) return;
updateNowPlaying();
@@ -88,18 +90,29 @@ public slots:
void onPositionChanged(quint64 positionSecs, quint64 /*duration*/)
{
// Accumulate actual listening time to prevent false scrobbles from seeking
if (positionSecs > m_lastPosition && (positionSecs - m_lastPosition) <= 2) {
m_accumulatedSecs += (positionSecs - m_lastPosition);
}
m_lastPosition = positionSecs;
m_playedSecs = positionSecs;
if (!isEnabled() || m_scrobbled || m_title.isEmpty() || m_duration < 30) return;
// Scrobble after 50% or 240 seconds played, whichever comes first, min 30 seconds.
const quint64 threshold = static_cast<quint64>(qMin((qint64)240, m_duration / 2));
if (positionSecs >= 30 && positionSecs >= threshold)
if (m_accumulatedSecs >= 30 && m_accumulatedSecs >= threshold)
scrobble();
}
void onTrackFinished()
{
if (!isEnabled() || m_scrobbled || m_title.isEmpty() || m_duration < 30) return;
if (m_playedSecs >= 30) scrobble();
const quint64 threshold = static_cast<quint64>(qMin((qint64)240, m_duration / 2));
if (m_accumulatedSecs >= 30 && m_accumulatedSecs >= threshold) {
scrobble();
}
}
private:
@@ -108,10 +121,12 @@ private:
QString m_title;
QString m_artist;
QString m_album;
qint64 m_duration = 0;
qint64 m_startTime = 0;
quint64 m_playedSecs = 0;
bool m_scrobbled = false;
qint64 m_duration = 0;
qint64 m_startTime = 0;
quint64 m_playedSecs = 0;
quint64 m_lastPosition = 0;
quint64 m_accumulatedSecs = 0;
bool m_scrobbled = false;
void updateNowPlaying()
{
@@ -134,16 +149,18 @@ private:
{
m_scrobbled = true;
QMap<QString,QString> params;
params["method"] = QStringLiteral("track.scrobble");
params["api_key"] = AppSettings::instance().lastFmApiKey();
params["sk"] = AppSettings::instance().lastFmSessionKey();
params["artist"] = m_artist;
params["track"] = m_title;
params["album"] = m_album;
params["timestamp"] = QString::number(m_startTime);
params["duration"] = QString::number(m_duration);
params["api_sig"] = buildSig(params, AppSettings::instance().lastFmApiSecret());
params["format"] = QStringLiteral("json");
params["method"] = QStringLiteral("track.scrobble");
params["api_key"] = AppSettings::instance().lastFmApiKey();
params["sk"] = AppSettings::instance().lastFmSessionKey();
params["artist[0]"] = m_artist;
params["track[0]"] = m_title;
params["album[0]"] = m_album;
params["timestamp[0]"] = QString::number(m_startTime);
params["duration[0]"] = QString::number(m_duration);
params["api_sig"] = buildSig(params, AppSettings::instance().lastFmApiSecret());
params["format"] = QStringLiteral("json");
auto *reply = m_nam->post(apiRequest(), encodeBody(params));
connect(reply, &QNetworkReply::finished, reply, &QNetworkReply::deleteLater);