android播放器MediaPlayer快进报错error (-2147483648, 0)&error (-38, 0)，分析log解决问题

最新推荐文章于 2021-05-29 00:58:05 发布

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最新推荐文章于 2021-05-29 00:58:05 发布

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本文分析了Android MediaPlayer在快进操作时遇到的两个错误：(-2147483648, 0)和(-38, 0)。错误1可能由于在onSeekComplete后执行了不必要的pause操作。根据MediaPlayer状态机，直接在开始状态下执行seekTo是允许的。修复方法是移除seekTo后的pause调用和onSeekComplete后的start调用。错误2是由于错误1导致的，当MediaPlayer无效时尝试获取duration。解决方案是理解错误来源并根据MediaPlayer的工作原理来修复。" 48286691,5101559,iOS开发：轻松获取UUID指南,"['iOS开发', 'Swift', 'UUID']

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01-02 09:43:00.842: E/tips(6475): ************setViewSeekTo: opCode:1003;curPos:8935;desPos:10635

01-02 09:43:00.842: E/tips(6475): seekTo:10635

01-02 09:43:00.842: V/MediaPlayer(6475): getDuration

01-02 09:43:00.842: V/MediaPlayer(6475): seekTo 10635

01-02 09:43:00.842: V/MediaPlayer(6475): Seek in progress - queue up seekTo[10635]

01-02 09:43:00.842: V/MediaPlayer(6475): isPlaying: 0

01-02 09:43:00.852: V/MediaPlayer(6475): message received msg=200, ext1=1005, ext2=0

01-02 09:43:00.852: W/MediaPlayer(6475): info/warning (1005, 0)

01-02 09:43:00.852: V/MediaPlayer(6475): callback application

01-02 09:43:00.852: V/MediaPlayer(6475): back from callback

01-02 09:43:00.862: V/MediaPlayer(6475): Using cached seek position: 10635

01-02 09:43:00.862: E/tips(6475): ************onSeekComplete: mLastOpCode:1003;curPos:10635

01-02 09:43:00.862: V/MediaPlayer(6475): start

01-02 09:43:01.092: D/skia(6475): failed to malloc mmz memory:230 kbytes

01-02 09:43:01.112: D/skia(6475): failed to malloc mmz memory:4 kbytes

01-02 09:43:01.122: I/MediaPlayer(6475): Info (1005,0)

01-02 09:43:01.132: V/MediaPlayer(6475): isPlaying: 1

01-02 09:43:01.132: V/MediaPlayer(6475): isPlaying: 1

01-02 09:43:01.132: V/MediaPlayer(6475): pause

01-02 09:43:01.132: V/MediaPlayer(6475): message received msg=100, ext1=-2147483648, ext2=0

01-02 09:43:01.132: E/MediaPlayer(6475): error (-2147483648, 0)

01-02 09:43:01.132: V/MediaPlayer(6475): callback application

01-02 09:43:01.132: V/MediaPlayer(6475): back from callback

01-02 09:43:01.142: V/MediaPlayer(6475): Using cached seek position: 10635

01-02 09:43:01.142: E/tips(6475): ************setViewSeekTo: opCode:1003;curPos:10635;desPos:12335

01-02 09:43:01.142: E/tips(6475): seekTo:12335

01-02 09:43:01.142: V/MediaPlayer(6475): getDuration

01-02 09:43:01.142: E/MediaPlayer(6475): Attempt to call getDuration without a valid mediaplayer

01-02 09:43:01.142: V/MediaPlayer(6475): message received msg=100, ext1=-38, ext2=0

01-02 09:43:01.142: E/MediaPlayer(6475): error (-38, 0)

01-02 09:43:01.142: V/MediaPlayer(6475): callback application

01-02 09:43:01.142: V/MediaPlayer(6475): back from callback

01-02 09:43:01.142: I/tips(6475): seekTo: mCanPause=true

01-02 09:43:01.142: I/tips(6475): seekTo: mCanSeekBack=true

01-02 09:43:01.142: I/tips(6475): seekTo: mCanSeekForward=true

01-02 09:43:01.142: V/MediaPlayer(6475): seekTo 12335

01-02 09:43:01.142: E/MediaPlayer(6475): Attempt to perform seekTo in wrong state: mPlayer=0x5ec860, mCurrentState=0

01-02 09:43:01.142: V/MediaPlayer(6475): message received msg=100, ext1=-38, ext2=0

01-02 09:43:01.142: E/MediaPlayer(6475): error (-38, 0)

01-02 09:43:01.142: V/MediaPlayer(6475): callback application

01-02 09:43:01.142: V/MediaPlayer(6475): back from callback

01-02 09:43:01.142: V/MediaPlayer(6475): isPlaying: 1

01-02 09:43:01.142: V/MediaPlayer(6475): pause

01-02 09:43:01.142: E/MediaPlayer(6475): pause called in state 0

01-02 09:43:01.142: V/MediaPlayer(6475): message received msg=100, ext1=-38, ext2=0

01-02 09:43:01.142: E/MediaPlayer(6475): error (-38, 0)

01-02 09:43:01.142: V/MediaPlayer(6475): callback application

01-02 09:43:01.152: V/MediaPlayer(6475): back from callback

01-02 09:43:01.152: E/MediaPlayer(6475): Error (-2147483648,0)

01-02 09:43:01.152: D/VideoPlayer(6475): Error: -2147483648,0

01-02 09:43:01.332: D/skia(6475): failed to malloc mmz memory:67 kbytes

01-02 09:43:01.362: E/MediaPlayer(6475): Error (-38,0)

01-02 09:43:01.362: D/VideoPlayer(6475): Error: -38,0

01-02 09:43:01.372: E/MediaPlayer(6475): Error (-38,0)

01-02 09:43:01.372: D/VideoPlayer(6475): Error: -38,0

01-02 09:43:01.372: E/MediaPlayer(6475): Error (-38,0)

01-02 09:43:01.372: D/VideoPlayer(6475): Error: -38,0

01-02 09:43:01.382: D/skia(6475): failed to malloc mmz memory:230 kbytes

01-02 09:43:01.382: D/skia(6475): failed to malloc mmz memory:4 kbytes

=================================================

代码流程：

1.seekTo函数

mMediaPlayer.seekTo(sec);

mMediaPlayer.pause();

2. onSeekComplete函数

mMediaPlayer.start();

错误1：

01-02 09:43:01.132: E/MediaPlayer(6475): error (-2147483648, 0)

分析log，在 onSeekComplete之后，执行了start和pause（异步操作，延迟到onSeekComplete之后才执行）操作，产生了错误，所以有可能是因为pause引起的错误。

由MediaPlayer状态机（ http://blog.youkuaiyun.com/thl789/article/details/7370438 ），我们可以知道，在Started的状态下是可以直接执行seekTo操作。

代码修改方式如下：

1.在seekTo之后，去掉 mMediaPlayer.pause();

2.在 onSeekComplete之后，去掉 mMediaPlayer.start();

测试播放快进正常，修改正确。

错误2 ：

01-02 09:43:01.142: V/MediaPlayer(6475): getDuration

01-02 09:43:01.142: E/MediaPlayer(6475): Attempt to call getDuration without a valid mediaplayer

01-02 09:43:01.142: V/MediaPlayer(6475): message received msg=100, ext1=-38, ext2=0

01-02 09:43:01.142: E/MediaPlayer(6475): error (-38, 0)

错误2 是由于错误1产生后引起的错误。

解决这个错误的过程告诉我们解决问题的方法：

1.先通过log错误查找百度，有现成方案可直接使用。

2.在没有现成的解决方案的情况下，先了解原理，然后再对应原理分析log错误，找到引起问题的原因，进而获得解决方案。

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