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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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89 lines
3.9 KiB
C
89 lines
3.9 KiB
C
#include <gst/gst.h>
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int main(int argc, char *argv[]) {
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GstElement *pipeline, *audio_source, *tee, *audio_queue, *audio_convert, *audio_resample, *audio_sink;
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GstElement *video_queue, *visual, *video_convert, *video_sink;
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GstBus *bus;
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GstMessage *msg;
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GstPadTemplate *tee_src_pad_template;
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GstPad *tee_audio_pad, *tee_video_pad;
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GstPad *queue_audio_pad, *queue_video_pad;
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/* Initialize GStreamer */
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gst_init (&argc, &argv);
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/* Create the elements */
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audio_source = gst_element_factory_make ("audiotestsrc", "audio_source");
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tee = gst_element_factory_make ("tee", "tee");
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audio_queue = gst_element_factory_make ("queue", "audio_queue");
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audio_convert = gst_element_factory_make ("audioconvert", "audio_convert");
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audio_resample = gst_element_factory_make ("audioresample", "audio_resample");
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audio_sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
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video_queue = gst_element_factory_make ("queue", "video_queue");
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visual = gst_element_factory_make ("wavescope", "visual");
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video_convert = gst_element_factory_make ("ffmpegcolorspace", "csp");
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video_sink = gst_element_factory_make ("autovideosink", "video_sink");
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/* Create the empty pipeline */
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pipeline = gst_pipeline_new ("test-pipeline");
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if (!pipeline || !audio_source || !tee || !audio_queue || !audio_convert || !audio_resample || !audio_sink ||
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!video_queue || !visual || !video_convert || !video_sink) {
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g_printerr ("Not all elements could be created.\n");
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return -1;
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}
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/* Configure elements */
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g_object_set (audio_source, "freq", 215.0f, NULL);
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g_object_set (visual, "shader", 0, "style", 1, NULL);
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/* Link all elements that can be automatically linked because they have "Always" pads */
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gst_bin_add_many (GST_BIN (pipeline), audio_source, tee, audio_queue, audio_convert, audio_resample, audio_sink,
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video_queue, visual, video_convert, video_sink, NULL);
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if (gst_element_link_many (audio_source, tee, NULL) != TRUE ||
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gst_element_link_many (audio_queue, audio_convert, audio_resample, audio_sink, NULL) != TRUE ||
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gst_element_link_many (video_queue, visual, video_convert, video_sink, NULL) != TRUE) {
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g_printerr ("Elements could not be linked.\n");
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gst_object_unref (pipeline);
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return -1;
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}
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/* Manually link the Tee, which has "Request" pads */
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tee_src_pad_template = gst_element_class_get_pad_template (GST_ELEMENT_GET_CLASS (tee), "src%d");
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tee_audio_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
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g_print ("Obtained request pad %s for audio branch.\n", gst_pad_get_name (tee_audio_pad));
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queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
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tee_video_pad = gst_element_request_pad (tee, tee_src_pad_template, NULL, NULL);
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g_print ("Obtained request pad %s for video branch.\n", gst_pad_get_name (tee_video_pad));
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queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
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if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
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gst_pad_link (tee_video_pad, queue_video_pad) != GST_PAD_LINK_OK) {
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g_printerr ("Tee could not be linked.\n");
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gst_object_unref (pipeline);
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return -1;
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}
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gst_object_unref (queue_audio_pad);
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gst_object_unref (queue_video_pad);
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/* Start playing the pipeline */
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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/* Wait until error or EOS */
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bus = gst_element_get_bus (pipeline);
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msg = gst_bus_timed_pop_filtered (bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
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/* Release the request pads from the Tee, and unref them */
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gst_element_release_request_pad (tee, tee_audio_pad);
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gst_element_release_request_pad (tee, tee_video_pad);
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gst_object_unref (tee_audio_pad);
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gst_object_unref (tee_video_pad);
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/* Free resources */
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if (msg != NULL)
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gst_message_unref (msg);
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gst_object_unref (bus);
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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return 0;
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}
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