的Gstreamer源代码不工作

我有以下管线它们中的一个UDP端口上发送语音信号，另一个接收它们在相同的端口号在接收机侧的Gstreamer源代码不工作

gst-launch-1.0 -v alsasrc ! audioconvert 
! audio/x-raw,channels=2,depth=16,width=16,rate=44100 ! 
    rtpL16pay ! udpsink 
    host=127.0.0.1 port=5000 //sender

和

gst-launch-1.0 udpsrc port=5000 ! "application/x-rtp, 
media=(string)audio, clock-rate=(int)44100, 
encoding-name=(string)L16, channels=(int)2, 
payload=(int)96" ! rtpL16depay ! audioconvert 
! alsasink //receiver

现在我正在尝试使用Gstreamer SDK编写一个源代码，它可以执行相同的操作。我已经到目前为止：

#include <gst/gst.h> 
#include <string.h> 
int main(int argc, char *argv[]) { 
    GstElement *pipeline, *source, *audiosink,*rtppay,*rtpdepay,*filter,*filter1,*conv,*conv1,*udpsink,*udpsrc,*receive_resample; 
    GstBus *bus; 
    GstMessage *msg; 
    GstCaps *filtercaps; 
    GstStateChangeReturn ret; 

    /* Initialize GStreamer */ 
    gst_init (&argc, &argv); 

    /* Create the elements */ 
    source = gst_element_factory_make ("alsasrc", "source"); 
    conv= gst_element_factory_make ("audioconvert", "conv"); 
    conv1= gst_element_factory_make ("audioconvert", "conv1"); 
    filter=gst_element_factory_make("capsfilter","filter"); 
    rtppay=gst_element_factory_make("rtpL16pay","rtppay"); 
    rtpdepay=gst_element_factory_make("rtpL16depay","rtpdepay"); 
    udpsink=gst_element_factory_make("udpsink","udpsink"); 
    audiosink = gst_element_factory_make ("autoaudiosink", "audiosink"); 
receive_resample = gst_element_factory_make("audioresample", NULL); 

udpsrc=gst_element_factory_make("udpsrc",NULL); 
    filter1=gst_element_factory_make("capsfilter","filter"); 
    g_object_set(udpsrc,"port",5000,NULL); 
    g_object_set (G_OBJECT (udpsrc), "caps", gst_caps_from_string("application/x-rtp,media=audio,payload=96,clock-rate=44100,encoding-name=L16,channels=2"), NULL); 

    /* Create the empty pipeline */ 
    pipeline = gst_pipeline_new ("test-pipeline"); 

    if (!pipeline || !source || !filter || !conv || !rtppay || !udpsink ) { 
    g_printerr ("Not all elements could be created.\n"); 
    return -1; 
    } 

g_object_set(G_OBJECT(udpsink),"host","127.0.0.1",NULL); 
    g_object_set(G_OBJECT(udpsink),"port",5000,NULL); 

filtercaps = gst_caps_new_simple ("audio/x-raw", 
    "channels", G_TYPE_INT, 2, 
    "width", G_TYPE_INT, 16, 
    "depth", G_TYPE_INT, 16, 
    "rate", G_TYPE_INT, 44100, 
    NULL); 

g_object_set (G_OBJECT (filter), "caps", filtercaps, NULL); 
    gst_caps_unref (filtercaps); 


filtercaps = gst_caps_new_simple ("application/x-rtp", 
    "media",G_TYPE_STRING,"audio", 
    "clock-rate",G_TYPE_INT,44100, 
    "encoding-name",G_TYPE_STRING,"L16", 
    "channels", G_TYPE_INT, 2, 
    "payload",G_TYPE_INT,96, 
    NULL); 

g_object_set (G_OBJECT (filter1), "caps", filtercaps, NULL); 
gst_caps_unref (filtercaps); 

    /* Build the pipeline */ 
    gst_bin_add_many (GST_BIN (pipeline), source,filter,conv,rtppay,udpsink, NULL); 
    if (gst_element_link_many (source,filter,conv,rtppay,udpsink, NULL) != TRUE) { 
    g_printerr ("Elements could not be linked.\n"); 
    gst_object_unref (pipeline); 
    return -1; 
    } 

gst_bin_add_many (GST_BIN (pipeline),udpsrc,rtpdepay,conv1,receive_resample,audiosink,NULL); 
    if (gst_element_link_many (udpsrc,rtpdepay,conv1,receive_resample,audiosink,NULL) != TRUE) { 
    g_printerr ("Elements could not be linked.\n"); 
    gst_object_unref (pipeline); 
    return -1; 
    } 

    /* Modify the source's properties */ 
// g_object_set (source, "pattern", 0, NULL); 

    /* Start playing */ 
    ret = gst_element_set_state (pipeline, GST_STATE_PLAYING); 
    if (ret == GST_STATE_CHANGE_FAILURE) { 
    g_printerr ("Unable to set the pipeline to the playing state.\n"); 
    gst_object_unref (pipeline); 
    return -1; 
    } 

    /* Wait until error or EOS */ 
    bus = gst_element_get_bus (pipeline); 
    msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS); 

    /* Parse message */ 
    if (msg != NULL) { 
    GError *err; 
    gchar *debug_info; 

    switch (GST_MESSAGE_TYPE (msg)) { 
     case GST_MESSAGE_ERROR: 
     gst_message_parse_error (msg, &err, &debug_info); 
     g_printerr ("Error received from element %s: %s\n", GST_OBJECT_NAME (msg->src), err->message); 
     g_printerr ("Debugging information: %s\n", debug_info ? debug_info : "none"); 
     g_clear_error (&err); 
     g_free (debug_info); 
     break; 
     case GST_MESSAGE_EOS: 
     g_print ("End-Of-Stream reached.\n"); 
     break; 
     default: 
     /* We should not reach here because we only asked for ERRORs and EOS */ 
     g_printerr ("Unexpected message received.\n"); 
     break; 
    } 
    gst_message_unref (msg); 
    } 

    /* Free resources */ 
    gst_object_unref (bus); 
    gst_element_set_state (pipeline, GST_STATE_NULL); 
    gst_object_unref (pipeline); 
    return 0; 
}

但不知何故，我没有收到接收器上的任何声音。我没有得到任何形式的任何错误。任何想法为什么发生这种情况？

来源

2013-12-10 fer y

嗯，我想通了。我不知道为什么，但是当我分了源代码转换成两个独立的人，并在其中一人包括我的代码，直到UDPsink元素和包括之后的其余元件（意为udpsrc，rtpdepay和audiosink）在另一个源代码文件中，并分别在两个单独的终端工作。我仍然不知道为什么它是这样，但我很高兴它的作品。

来源

2013-12-10 16:51:19

发件人和reciever应该是两个不同的过程，这就是为什么当你使用两个终端它的工作原理。

在你的代码，你把两个不同的管道在同一管道元素，并将其设置为播放。这不支持，您需要为此创建不同的管道。

pipeline1 = gst_pipeline_new ("src-pipeline"); 
pipeline2 = gst_pipeline_new ("sink-pipeline");

来源

2013-12-17 06:08:54 rubndsouza

的Gstreamer源代码不工作

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