GStreamer； Unable to play - “xxxx.wav“ Warning: “No decoder available for type ‘audio/x-wav‘.“

Liu-Eleven

已于 2024-12-04 16:25:50 修改

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分类专栏： yocto 文章标签：数据库

于 2024-12-04 16:21:11 首次发布

本文链接：https://blog.youkuaiyun.com/lsylovezsl/article/details/144242769

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最近在芯驰x9hp平台使用qt开发仪表，由于需要播放警告音，所以使用qt的媒体库是最方便的。但是想法是美好的现实却是骨感的。移植过程中，遇到了各种错误。以下做个总结。

先贴出来测试例子代码，很简单：

  QMediaPlayer player;
    QMediaPlaylist playlist;

    playlist.addMedia(QUrl::fromLocalFile("/media/Sound_Alarm/buzzerlong.wav"));  // 添加蜂鸣音文件路径
    playlist.setPlaybackMode(QMediaPlaylist::Loop);     // 设置为循环播放

    player.setPlaylist(&playlist);
    player.setVolume(50);                               // 设置音量（0 到 100）
    player.play();                                      // 开始播放


    QTimer::singleShot(1000 , &a , [&](){
         qDebug() << "This task will be executed after 2000 ms.";
        a.quit();
    });

错误一：defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

这个错误报的不够明显，使用QT_DEBUG_PLUGINS开启详细错误信息

root@x9hp_ms_a12_vemmc_ap2:/usr/lib# export QT_DEBUG_PLUGINS=1

再次运行报错如下：

root@x9hp_ms_a12_vemmc_ap2:/data# ./test_wav
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/plugins/mediaservice" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/mediaservice/libqtmedia_audioengine.so"
Found metadata in lib /usr/lib/plugins/mediaservice/libqtmedia_audioengine.so, metadata=
{
    "IID": "org.qt-project.qt.mediaserviceproviderfactory/5.0",
    "MetaData": {
        "Keys": [
            "audiocapture"
        ],
        "Services": [
            "org.qt-project.qt.audiosource"
        ]
    },
    "archreq": 0,
    "className": "AudioCaptureServicePlugin",
    "debug": false,
    "version": 330752
}


Got keys from plugin meta data ("audiocapture")
QFactoryLoader::QFactoryLoader() checking directory path "/data/mediaservice" ...
defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/plugins/bearer" ...
QFactoryLoader::QFactoryLoader() looking at "/usr/lib/plugins/bearer/libqconnmanbearer.so"
Found metadata in lib /usr/lib/plugins/bearer/libqconnmanbearer.so, metadata=
{
    "IID": "org.qt-project.Qt.QBearerEngineFactoryInterface",
    "MetaData": {
        "Keys": [
            "connman"
        ]
    },
    "archreq": 0,
    "className": "QConnmanEnginePlugin",
    "debug": false,
    "version": 330752
}

这个错误是缺少qt播放的库，于是进入目标板上的目录查看：没有名为：

/usr/lib/plugins/mediaservice

的目录，于是需要在yocto中配置：

IMAGE_INSTALL_append = " qtmultimedia qtmultimedia-plugins"
PACKAGECONFIG_append_pn-qtmultimedia = " gstreamer"

配置编译，烧录。然后运行测试列子会出现第二个错误。

错误二：Warning: "No decoder available for type 'audio/x-wav'."

Got keys from plugin meta data ("networkmanager")
QFactoryLoader::QFactoryLoader() checking directory path "/data/bearer" ...
loaded library "/usr/lib/plugins/bearer/libqconnmanbearer.so"
loaded library "/usr/lib/plugins/bearer/libqgenericbearer.so"
loaded library "/usr/lib/plugins/bearer/libqnmbearer.so"
GStreamer; Unable to play - "file:///media/Sound_Alarm/buzzerlong.wav"
Warning: "No decoder available for type 'audio/x-wav'."

这个问题经过学习查找，是缺少库文件libgstwavparse.so。查找过程如下，使用命令：

GST_DEBUG=3 gst-launch-1.0 filesrc location=/media/Sound_Alarm/buzzerlong.wav ! wavparse ! audioconvert ! audioresample ! autoaudiosink

使用该命令来测试，如果出错就一个一个都去查看gstream的插件。如果插件存在如下图所示：

root@zsos-root:/opt# gst-inspect-1.0 wavparse
Factory Details:
  Rank                     primary (256)
  Long-name                WAV audio demuxer
  Klass                    Codec/Demuxer/Audio
  Description              Parse a .wav file into raw audio
  Author                   Erik Walthinsen <omega@cse.ogi.edu>

Plugin Details:
  Name                     wavparse
  Description              Parse a .wav file into raw audio
  Filename                 /usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstwavparse.so
  Version                  1.20.3
  License                  LGPL
  Source module            gst-plugins-good
  Source release date      2022-06-15
  Binary package           GStreamer Good Plugins (Ubuntu)
  Origin URL               https://launchpad.net/distros/ubuntu/+source/gst-plugins-good1.0

GObject
 +----GInitiallyUnowned
       +----GstObject
             +----GstElement
                   +----GstWavParse

Pad Templates:
  SINK template: 'sink'
    Availability: Always
    Capabilities:
      audio/x-wav
      audio/x-rf64
  
  SRC template: 'src'
    Availability: Always
    Capabilities:
      audio/ms-gsm
      audio/mpeg
            mpegversion: 1
                  layer: 3

如果插件不存在如下：

gst-launch-1.0 filesrc location=/media/Sound_Alarm/buzzerlong.wav ! decodebin ! audioconvert ! audioresample ! pulsesink
WARNING: erroneous pipeline: no element "decodebin"

附加几条gstream测试

1.播放文件

root@zsos-root:~# gst-launch-1.0 filesrc location=/media/Sound_Alarm/buzzerlong.wav ! wavparse ! audioconvert ! audioresample ! autoaudiosink
设置暂停管道 ...
管道正在 PREROLLING ...
重新分配延迟时间...
管道被 PREROLLED ...
设置播放管道 ...
重新分配延迟时间...
New clock: GstPulseSinkClock
收到来自组件“pipeline0”的 EOS 信号。
Execution ended after 0:00:02.185504227
设置 NULL 管道 ...
释放管道资源 ...

2.使用调试模式播放文件

root@zsos-root:~# GST_DEBUG=3 gst-launch-1.0 filesrc location=/media/Sound_Alarm/buzzerlong.wav ! wavparse ! audioconvert ! audioresample ! autoaudiosink
设置暂停管道 ...
0:00:04.152401428 2227930 0x5a2a23d54f00 WARN                 basesrc gstbasesrc.c:3688:gst_base_src_start_complete:<filesrc0> pad not activated yet
管道正在 PREROLLING ...
0:00:04.207029888 2227930 0x5a2a23d58520 WARN         audio-resampler audio-resampler.c:274:convert_taps_gint16_c: can't find exact taps
重新分配延迟时间...
管道被 PREROLLED ...
设置播放管道 ...
重新分配延迟时间...
New clock: GstPulseSinkClock
0:00:06.349690225 2227930 0x76da30038580 WARN                   pulse pulsesink.c:703:gst_pulsering_stream_underflow_cb:<autoaudiosink0-actual-sink-pulse> Got underflow
收到来自组件“pipeline0”的 EOS 信号。
Execution ended after 0:00:02.185661915
设置 NULL 管道 ...
释放管道资源 ...

3.长鸣测试

root@x9hp_ms_a12_vemmc_ap2:~# gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! alsasink
Setting pipeline to PAUSED ...
Dmix type: 22, pcm areas (0xffffa676a000) silence
Pipeline is PREROLLING ...
Redistribute latency...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstAudioSinkClock
�^Chandling interrupt.
Interrupt: Stopping pipeline ...
Execution ended after 0:00:03.150230333
Setting pipeline to PAUSED ...
Setting pipeline to READY ...
Setting pipeline to NULL ...
Freeing pipeline ...

4.播报测试

root@x9hp_ms_a12_vemmc_ap2:~# speaker-test -t wav -c 2

speaker-test 1.1.5

Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
Dmix type: 22, pcm areas (0xffff9e4b5000) silence
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 1920 to 3840
Period size range from 960 to 960
Using max buffer size 3840
Periods = 4
was set period_size = 960
was set buffer_size = 3840
 0 - Front Left
 1 - Front Right
Time per period = 2.939456
 0 - Front Left
 1 - Front Right