GStreamer audiomixer problem

[Johan Basore]

Hello,

I wrote some codes with Gstreamer ios sdk. But it not works, no errors, but
the pipeline not plays.

    gst_element_link(source1, decodebin1);
    gst_element_link(source2, decodebin2);
    
    gst_element_link(decodebin1, audiomixer);
    gst_element_link(decodebin2, audiomixer);
    gst_element_link_many(audiomixer, audioconvert, avenc_ac3, audiosink,
nil);

    g_signal_connect(decodebin1, "pad-added",
G_CALLBACK(on_pad_added_audio1), audiomixer);
    g_signal_connect(decodebin2, "pad-added",
G_CALLBACK(on_pad_added_audio2), audiomixer);


static void on_pad_added_audio1 (GstElement *element, GstPad *pad, gpointer
data)
{
    GstPad *sinkpad;
    
    GstCaps *pCaps = gst_pad_get_current_caps(pad);
    GstStructure *pStructure = gst_caps_get_structure(pCaps, 0);
    gchar* pstrName = gst_structure_get_name(pStructure);
    
    if (g_str_has_prefix(pstrName, "audio"))
    {
        GST_DEBUG("Linking input pad to mixer - audio1");
        
        sinkpad = gst_element_get_request_pad((GstElement*)data, "sink_3");
        gst_pad_link(pad, sinkpad);
        gst_object_unref(sinkpad);
    }
}

static void on_pad_added_audio2 (GstElement *element, GstPad *pad, gpointer
data)
{
    GstPad *sinkpad;
    
    GstCaps *pCaps = gst_pad_get_current_caps(pad);
    GstStructure *pStructure = gst_caps_get_structure(pCaps, 0);
    gchar* pstrName = gst_structure_get_name(pStructure);
    
    if (g_str_has_prefix(pstrName, "audio"))
    {
        GST_DEBUG("Linking input pad to mixer - audio2");
        
        sinkpad = gst_element_get_request_pad((GstElement*)data, "sink_4");
        gst_pad_link(pad, sinkpad);
        gst_object_unref(sinkpad);
    }
}

I can't understand what is wrong.



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