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player/Thread: add attribute `decoder_wakeup_threshold` 

Calculate the value only once.
This commit is contained in:
Max Kellermann 2018-09-22 19:56:00 +02:00
parent bfd261929e
commit 1191025bbf
1 changed files with 16 additions and 4 deletions
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20
src/player/Thread.cxx
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@ -78,6 +78,16 @@ class Player {
*/
std::unique_ptr<Tag> cross_fade_tag;
/**
* If the decoder pipe gets consumed below this threshold,
* it's time to wake up the decoder.
*
* It is calculated in a way which should prevent a wakeup
* after each single consumed chunk; it is more efficient to
* make the decoder decode a larger block at a time.
*/
const unsigned decoder_wakeup_threshold;
/**
* are we waiting for buffered_before_play?
*/
@ -174,7 +184,11 @@ class Player {
public:
Player(PlayerControl &_pc, DecoderControl &_dc,
MusicBuffer &_buffer) noexcept
:pc(_pc), dc(_dc), buffer(_buffer) {}
:pc(_pc), dc(_dc), buffer(_buffer),
decoder_wakeup_threshold((pc.buffered_before_play +
buffer.GetSize() * 3) / 4)
{
}
private:
/**
@ -886,9 +900,7 @@ Player::PlayNextChunk() noexcept
/* this formula should prevent that the decoder gets woken up
with each chunk; it is more efficient to make it decode a
larger block at a time */
if (!dc.IsIdle() &&
dc.pipe->GetSize() <= (pc.buffered_before_play +
buffer.GetSize() * 3) / 4) {
if (!dc.IsIdle() && dc.pipe->GetSize() <= decoder_wakeup_threshold) {
if (!decoder_woken) {
decoder_woken = true;
dc.Signal();