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7c66b6ed3b
This is the start of a sequence of changes to fix the ref'd github issue. Currently TsExtractor involves multiple memory copy steps: DataSource->Ts_BitArray->Pes_BitArray->Sample->SampleHolder This is inefficient, but more importantly, the copy into Sample is problematic, because Samples are of dynamically varying size. The way we end up expanding Sample objects to be large enough to hold the data being written means that we end up gradually expanding all Sample objects in the pool (which wastes memory), and that we generate a lot of GC churn, particularly when switching to a higher quality which can trigger all Sample objects to expand. The fix will be to reduce the copy steps to: DataSource->TsPacket->SampleHolder We will track Pes and Sample data with lists of pointers into TsPackets, rather than actually copying the data. We will recycle these pointers. The following steps are approximately how the refactor will progress: 1. Start reducing use of BitArray. It's going to be way too complicated to track bit-granularity offsets into multiple packets, and allow reading across packet boundaries. In practice reads from Ts packets are all byte aligned except for small sections, so we'll move over to using ParsableByteArray instead, so we only need to track byte offsets. 2. Move TsExtractor to use ParsableByteArray except for small sections where we really need bit-granularity offsets. 3. Do the actual optimization. Issue: #278
51 lines
1.6 KiB
Java
51 lines
1.6 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer;
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/**
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* Information about the ExoPlayer library.
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*/
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// TODO: This file should be automatically generated by the build system.
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public class ExoPlayerLibraryInfo {
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private ExoPlayerLibraryInfo() {}
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/**
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* The version of the library, expressed as a string.
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*/
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public static final String VERSION = "1.2.0";
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/**
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* The version of the library, expressed as an integer.
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* <p>
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* Three digits are used for each component of {@link #VERSION}. For example "1.2.3" has the
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* corresponding integer version 001002003.
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*/
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public static final int VERSION_INT = 001002000;
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/**
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* Whether the library was compiled with {@link com.google.android.exoplayer.util.Assertions}
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* checks enabled.
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*/
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public static final boolean ASSERTIONS_ENABLED = true;
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/**
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* Whether the library was compiled with {@link com.google.android.exoplayer.util.TraceUtil}
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* trace enabled.
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*/
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public static final boolean TRACE_ENABLED = true;
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}
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