我知道这个问题已经发布了好几次了。但是,没有一种解决方案对我有用。
我正在尝试使用gstreamer api播放.wav文件。下面的命令播放.wav文件(带有或不带有audioconvert):
gst-launch-1.0 filesrc location=sound.wav ! wavparse ! audioconvert ! alsasink
我为上述命令编写了一个简单的c ++代码,引用了GStreamer Hello world示例。但是它以“内部数据流错误”结束。这是我的代码:
{
gst_init(NULL, NULL);
m_pipeline = gst_pipeline_new("audio-player");
m_fileSource = gst_element_factory_make("filesrc", "file-source");
m_parser = gst_element_factory_make("wavparse", "wav-parser");
m_sink = gst_element_factory_make("alsasink", "audio-output");
if (!m_pipeline || !m_fileSource || !m_parser || !m_sink) {
g_printerr ("One or more elements could not be created !! \n");
return false;
}
/* Set up the pipeline */
else {
/* set the input filename to the source element */
g_object_set (G_OBJECT (m_fileSource), "location", path.toLatin1().data(), NULL);
/* set a message handler on a bus */
GstBus *bus = gst_pipeline_get_bus (GST_PIPELINE (m_pipeline));
gst_bus_add_watch(bus, bus_call, this);
gst_object_unref(bus);
/* add all elements into the pipeline */
gst_bin_add_many (GST_BIN (m_pipeline), m_fileSource, m_parser, m_sink, NULL);
/* link the elements together */
gst_element_link (m_fileSource, m_parser);
g_signal_connect(m_parser, "pad-added", G_CALLBACK(on_pad_added), m_sink);
}
gst_element_set_state(m_pipeline, GST_STATE_READY);
gst_element_set_state(m_pipeline, GST_STATE_PAUSED);
}
on_pad_added(GstElement *src_element, GstPad *src_pad, gpointer data)
{
GstElement *sink_element = (GstElement *)data;
GstPad *sink_pad = gst_element_get_static_pad(sink_element, "sink");
gst_pad_link(src_pad, sink_pad);
gst_object_unref(sink_pad);
src_element = NULL;
}
我什至尝试了此链接中建议的解决方案;如Glinker Hello World示例中所示,将“ oggdemux”替换为“ wavparse”,将“ vorbisdec”替换为“ identity”,如该链接中所建议。我收到的错误:
0:00:00.289443936 1624 0x1234e00 WARN basesrc gstbasesrc.c:3470:gst_base_src_start_complete:<file-source> pad not activated yet
0:00:00.290993573 1624 0x1740030 FIXME default gstutils.c:3643:gst_pad_create_stream_id_internal:<wav-parser:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id
0:00:00.291883886 1624 0x1740030 WARN wavparse gstwavparse.c:1564:gst_wavparse_stream_headers:<wav-parser> Ignoring chunk bext
0:00:00.292198262 1624 0x1740030 WARN wavparse gstwavparse.c:1564:gst_wavparse_stream_headers:<wav-parser> Ignoring chunk junk
0:00:00.305086920 1624 0x1234e00 WARN basesrc gstbasesrc.c:3470:gst_base_src_start_complete:<file-source> pad not activated yet
0:00:00.306444838 1624 0x17400c0 FIXME default gstutils.c:3643:gst_pad_create_stream_id_internal:<wav-parser:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id
0:00:00.307224214 1624 0x17400c0 WARN wavparse gstwavparse.c:1564:gst_wavparse_stream_headers:<wav-parser> Ignoring chunk bext
0:00:00.307636819 1624 0x17400c0 WARN wavparse gstwavparse.c:1564:gst_wavparse_stream_headers:<wav-parser> Ignoring chunk junk
0:00:00.526277506 1624 0x17400c0 WARN wavparse gstwavparse.c:2186:gst_wavparse_loop:<wav-parser> error: Internal data flow error.
0:00:00.526495475 1624 0x17400c0 WARN wavparse gstwavparse.c:2186:gst_wavparse_loop:<wav-parser> error: streaming task paused, reason not-linked (-1)
0:00:00.527296570 1624 0x1740030 WARN wavparse gstwavparse.c:2186:gst_wavparse_loop:<wav-parser> error: Internal data flow error.
0:00:00.527439278 1624 0x1740030 WARN wavparse gstwavparse.c:2186:gst_wavparse_loop:<wav-parser> error: streaming task paused, reason not-linked (-1)
ERROR: Internal data flow error.
ERROR: Internal data flow error.
我在代码中缺少什么?
您收到未链接的错误,某些元素未链接。
该元素是wavparse。您的代码正试图等待它添加一个填充板来链接它,但是wavparse有一个“总是”源填充板,这意味着自创建元素以来它就存在,因此您可以像直接使用它一样直接链接filesrc。
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我来说两句