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Use stream compression.

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Previously each data packet was compressed independently. After this
change all new packets reference the previously sent data, which
achieves better compression.
This commit is contained in:
Bartosz Taudul
2017-09-17 13:10:42 +02:00
parent 4c2bd7d9df
commit d7914439e9
4 changed files with 39 additions and 9 deletions
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15
server/TracyView.cpp
View File

@@ -8,7 +8,6 @@
#include <assert.h>
#include <limits>
#include "../common/tracy_lz4.hpp"
#include "../common/TracyProtocol.hpp"
#include "../common/TracySystem.hpp"
#include "../common/TracyQueue.hpp"
@@ -24,6 +23,9 @@ View::View( const char* addr )
: m_addr( addr )
, m_shutdown( false )
, m_mbps( 64 )
, m_stream( LZ4_createStreamDecode() )
, m_buffer( new char[TargetFrameSize*3] )
, m_bufferOffset( 0 )
{
assert( s_instance == nullptr );
s_instance = this;
@@ -37,6 +39,9 @@ View::~View()
m_shutdown.store( true, std::memory_order_relaxed );
m_thread.join();
delete[] m_buffer;
LZ4_freeStreamDecode( m_stream );
assert( s_instance != nullptr );
s_instance = nullptr;
}
@@ -67,6 +72,7 @@ void View::Worker()
if( !m_sock.Read( &lz4, sizeof( lz4 ), &tv, ShouldExit ) ) goto close;
m_frames.push_back( timeStart );
LZ4_setStreamDecode( m_stream, nullptr, 0 );
t0 = std::chrono::high_resolution_clock::now();
@@ -76,14 +82,14 @@ void View::Worker()
if( lz4 )
{
char buf[TargetFrameSize];
auto buf = m_buffer + m_bufferOffset;
char lz4buf[LZ4Size];
lz4sz_t lz4sz;
if( !m_sock.Read( &lz4sz, sizeof( lz4sz ), &tv, ShouldExit ) ) goto close;
if( !m_sock.Read( lz4buf, lz4sz, &tv, ShouldExit ) ) goto close;
bytes += sizeof( lz4sz ) + lz4sz;
auto sz = LZ4_decompress_safe( lz4buf, buf, lz4sz, TargetFrameSize );
auto sz = LZ4_decompress_safe_continue( m_stream, lz4buf, buf, lz4sz, TargetFrameSize );
assert( sz >= 0 );
const char* ptr = buf;
@@ -93,6 +99,9 @@ void View::Worker()
auto ev = (QueueItem*)ptr;
DispatchProcess( *ev, ptr );
}
m_bufferOffset += sz;
if( m_bufferOffset > TargetFrameSize * 2 ) m_bufferOffset = 0;
}
else
{