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c++ - 无法使用带有 gst-launch-1.0 的 Qemu 在 armv7 上播放 wav 音频

问题描述

我正在尝试使用 Qt 和 C++ 播放 WAV 音频文件，它失败然后我尝试使用 gst-launch-1.0 播放它，它也失败了。这一切都使用了 armv7 工具链并在 QEMU 下运行。

使用代码在 C++ 中失败后

QAudioDecoder decoder;
QFileInfo fileInfo(WAV_FILE_NAME);
decoder.setSourceFilename(fileInfo.absoluteFilePath());
decoder.start();
if (decoder.state() == QAudioDecoder::DecodingState)
    qDebug() << "Decoding";

它失败并出现错误

0:00:00.167441195 29283 0xf375dc00 WARN                 basesrc gstbasesrc.c:3583:gst_base_src_start_complete:<source> pad not activated yet
0:00:00.176093619 29283 0xf375dc00 WARN                 basesrc gstbasesrc.c:3583:gst_base_src_start_complete:<source> pad not activated yet
0:00:00.237290158 29283 0xf37fc660 WARN            uridecodebin gsturidecodebin.c:921:unknown_type_cb:<uridecodebin0> warning: No decoder available for type 'audio/x-wav'.
0:00:00.238382698 29283 0xf37fc660 WARN               decodebin gstdecodebin2.c:4640:gst_decode_bin_expose:<decodebin0> error: no suitable plugins found:
Missing decoder: WAV (audio/x-wav)

0:00:00.239083745 29283 0xf37fc660 WARN            uridecodebin gsturidecodebin.c:988:no_more_pads_full:<uridecodebin0> error: no suitable plugins found:
../../../gst-plugins-base-1.14.4/gst/playback/gstdecodebin2.c(4640): gst_decode_bin_expose (): /GstPlayBin:playbin1/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0:
no suitable plugins found:
Missing decoder: WAV (audio/x-wav)

0:00:00.240739264 29283 0xf37fc660 WARN                typefind gsttypefindelement.c:1231:gst_type_find_element_loop:<typefind> error: Internal data stream error.
0:00:00.240853974 29283 0xf37fc660 WARN                typefind gsttypefindelement.c:1231:gst_type_find_element_loop:<typefind> error: streaming stopped, reason not-linked (-1)

这就是为什么我尝试使用

./gst-launch-1.0 -v uridecodebin uri=file:///home/vbox/myaudio.wav

然后我也收到了这个错误

Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0: source = "\(GstFileSrc\)\ source"
/GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0/GstTypeFindElement:typefind.GstPad:src: caps = audio/x-wav
Missing element: WAV demuxer
WARNING: from element /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0: No decoder available for type 'audio/x-wav'.
Additional debug info:
../../../gst-plugins-base-1.14.4/gst/playback/gsturidecodebin.c(921): unknown_type_cb (): /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0
ERROR: from element /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0: Your GStreamer installation is missing a plug-in.
Additional debug info:
../../../gst-plugins-base-1.14.4/gst/playback/gsturidecodebin.c(988): no_more_pads_full (): /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0:
no suitable plugins found:
../../../gst-plugins-base-1.14.4/gst/playback/gstdecodebin2.c(4640): gst_decode_bin_expose (): /GstPipeline:pipeline0/GstURIDecodeBin:uridecodebin0/GstDecodeBin:decodebin0:
no suitable plugins found:
Missing decoder: WAV (audio/x-wav)

ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

我不确定真正缺少什么。此外，这是 gst-inspect-1.0 的输出

$> ./gst-inspect-1.0 | grep wav
   audiovisualizers:  wavescope: Waveform oscilloscope
   typefindfunctions: application/x-shockwave-flash: swf, swfl
   typefindfunctions: audio/x-wav: wav
   typefindfunctions: audio/x-wavpack: wv, wvp
   typefindfunctions: audio/x-wavpack-correction: wvc

这里可能缺少什么？

标签： c++qtaudioarmgstreamer

解决方案

“wavparse”插件应该可用。

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