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Improve working with cache in streaming.

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This commit is contained in:
John Preston 2019-02-26 19:31:33 +04:00
parent b6a757842a
commit 44df10d6cb
3 changed files with 49 additions and 24 deletions
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6
Telegram/SourceFiles/media/streaming/media_streaming_player.cpp
View File

@ -137,6 +137,7 @@ void Player::trackReceivedTill(
}
}
static auto wakes = 0;
template <typename Track>
void Player::trackPlayedTill(
const Track &track,
@ -152,6 +153,7 @@ void Player::trackPlayedTill(
if (_pauseReading && !bothReceivedEnough(kLoadInAdvanceFor)) {
_pauseReading = false;
_file->wake();
++wakes;
}
}
@ -417,7 +419,8 @@ bool Player::trackReceivedEnough(
const TrackState &state,
crl::time amount) const {
return FullTrackReceived(state)
|| (state.position + amount <= state.receivedTill);
|| (state.position != kTimeUnknown
&& state.position + amount <= state.receivedTill);
}
bool Player::bothReceivedEnough(crl::time amount) const {
@ -569,6 +572,7 @@ Player::~Player() {
//
// So instead of maintaining it in the class definition as well we
// simply call stop() here, after that the destruction is trivial.
LOG(("WAKES: %1").arg(wakes));
stop();
}

66
Telegram/SourceFiles/media/streaming/media_streaming_reader.cpp
View File

@ -357,19 +357,15 @@ auto Reader::Slices::fill(int offset, bytes::span buffer) -> FillResult {
&& (fromSlice + 1 == tillSlice || fromSlice + 2 == tillSlice)
&& tillSlice <= _data.size());
const auto cacheNotLoaded = [&](int sliceIndex) {
return (_headerMode != HeaderMode::NoCache)
&& (_headerMode != HeaderMode::Unknown)
&& !(_data[sliceIndex].flags & Flag::LoadedFromCache);
};
const auto handlePrepareResult = [&](
int sliceIndex,
const Slice::PrepareFillResult &prepared) {
if (sliceIndex == _data.size()) {
return;
}
if (!(_data[sliceIndex].flags & Flag::LoadedFromCache)
&& _headerMode != HeaderMode::NoCache
&& _headerMode != HeaderMode::Unknown) {
if (!(_data[sliceIndex].flags & Flag::LoadingFromCache)) {
_data[sliceIndex].flags |= Flag::LoadingFromCache;
result.sliceNumbersFromCache.add(sliceIndex + 1);
}
if (cacheNotLoaded(sliceIndex)) {
return;
}
for (const auto offset : prepared.offsetsFromLoader.values()) {
@ -379,7 +375,16 @@ auto Reader::Slices::fill(int offset, bytes::span buffer) -> FillResult {
}
}
};
const auto handleReadFromCache = [&](int sliceIndex) {
if (cacheNotLoaded(sliceIndex)
&& !(_data[sliceIndex].flags & Flag::LoadingFromCache)) {
_data[sliceIndex].flags |= Flag::LoadingFromCache;
if (sliceIndex == 23) {
int a = 0;
}
result.sliceNumbersFromCache.add(sliceIndex + 1);
}
};
const auto firstFrom = offset - fromSlice * kInSlice;
const auto firstTill = std::min(kInSlice, till - fromSlice * kInSlice);
const auto secondFrom = 0;
@ -389,7 +394,9 @@ auto Reader::Slices::fill(int offset, bytes::span buffer) -> FillResult {
? _data[fromSlice + 1].prepareFill(secondFrom, secondTill)
: Slice::PrepareFillResult();
handlePrepareResult(fromSlice, first);
handlePrepareResult(fromSlice + 1, second);
if (fromSlice + 1 < tillSlice) {
handlePrepareResult(fromSlice + 1, second);
}
if (first.ready && second.ready) {
markSliceUsed(fromSlice);
CopyLoaded(
@ -405,18 +412,13 @@ auto Reader::Slices::fill(int offset, bytes::span buffer) -> FillResult {
secondFrom,
secondTill);
}
if (_usedSlices.size() > kSlicesInMemory
&& _headerMode != HeaderMode::Unknown) {
const auto purgeSlice = _usedSlices.front();
_usedSlices.pop_front();
if (_headerMode == HeaderMode::NoCache
|| !(_data[purgeSlice].flags & Flag::ChangedSinceCache)) {
_data[purgeSlice] = Slice();
} else {
result.toCache = serializeAndUnloadSlice(purgeSlice + 1);
}
}
result.toCache = serializeAndUnloadUnused();
result.filled = true;
} else {
handleReadFromCache(fromSlice);
if (fromSlice + 1 < tillSlice) {
handleReadFromCache(fromSlice + 1);
}
}
return result;
}
@ -442,6 +444,24 @@ int Reader::Slices::maxSliceSize(int sliceNumber) const {
: _size;
}
Reader::SerializedSlice Reader::Slices::serializeAndUnloadUnused() {
if (_headerMode == HeaderMode::Unknown
|| _usedSlices.size() <= kSlicesInMemory) {
return {};
}
const auto purgeSlice = _usedSlices.front();
_usedSlices.pop_front();
if (!(_data[purgeSlice].flags & Slice::Flag::LoadedFromCache)) {
// If the only data in this slice was from _header, just leave it.
return {};
} else if (_headerMode == HeaderMode::NoCache
|| !(_data[purgeSlice].flags & Slice::Flag::ChangedSinceCache)) {
_data[purgeSlice] = Slice();
return {};
}
return serializeAndUnloadSlice(purgeSlice + 1);
}
Reader::SerializedSlice Reader::Slices::serializeAndUnloadSlice(
int sliceNumber) {
Expects(sliceNumber >= 0 && sliceNumber <= _data.size());

1
Telegram/SourceFiles/media/streaming/media_streaming_reader.h
View File

@ -127,6 +127,7 @@ private:
void applyHeaderCacheData();
int maxSliceSize(int sliceNumber) const;
SerializedSlice serializeAndUnloadSlice(int sliceNumber);
SerializedSlice serializeAndUnloadUnused();
void markSliceUsed(int sliceIndex);
std::vector<Slice> _data;