pipeline to code help

Brendan Long self at brendanlong.com
Wed Jul 17 09:53:53 PDT 2013

On 07/17/2013 10:04 AM, stixxy wrote:
> i have follow line and i want to compile what is the best solution for a
> simple code?
> gst-launch-0.10 alsasrc device=hw:0,0 ! audioconvert ! alsasink
> device=hw:0,0

You can create the same pipeline in C with gst_parse_launch

    GError* error;
    GstElement* pipeline = gst_parse_launch("alsasrc device=hw:0,0 !
    audioconvert ! alsasink device=hw:0,0", &error);
    if (error) {
        // print error
    if (pipeline) {
        gst_element_set_state(pipeline, GST_STATE_PLAYING);

Or you could build it by hand:

    GstElement* pipeline = gst_pipeline_new(NULL);

    GstElement* alsasrc = gst_element_factory_make("alsasrc", NULL);
    g_object_set(alsasrc, "device", "hw:0,0", NULL);
    gst_bin_add(GST_BIN(pipeline), alsasrc);

    GstElement* audioconvert = gst_element_factory_make("audioconvert",
    gst_bin_add(GST_BIN(pipeline), audioconvert);
    gst_element_link(alsasrc, audioconvert);

    GstElement* alsasink = gst_element_factory_make("alsasink", NULL);
    g_object_set(alsasink, "device", "hw:0,0", NULL);
    gst_bin_add(GST_BIN(pipeline), alsasink);
    gst_element_link(audioconvert, alsasink);

    gst_element_set_state(pipeline, GST_STATE_PLAYING);

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