Update

2022-03-12 03:16:09 +08:00
parent 12b76e0c7a
commit 27c4ec74a1
10075 changed files with 5122287 additions and 1 deletions
@@ -0,0 +1,98 @@
+#include <gst/gst.h>
+
+int
+main (int argc, char *argv[])
+{
+  GstElement *pipeline, *audio_source, *tee, *audio_queue, *audio_convert,
+      *audio_resample, *audio_sink;
+  GstElement *video_queue, *visual, *video_convert, *video_sink;
+  GstBus *bus;
+  GstMessage *msg;
+  GstPad *tee_audio_pad, *tee_video_pad;
+  GstPad *queue_audio_pad, *queue_video_pad;
+
+  /* Initialize GStreamer */
+  gst_init (&argc, &argv);
+
+  /* Create the elements */
+  audio_source = gst_element_factory_make ("audiotestsrc", "audio_source");
+  tee = gst_element_factory_make ("tee", "tee");
+  audio_queue = gst_element_factory_make ("queue", "audio_queue");
+  audio_convert = gst_element_factory_make ("audioconvert", "audio_convert");
+  audio_resample = gst_element_factory_make ("audioresample", "audio_resample");
+  audio_sink = gst_element_factory_make ("autoaudiosink", "audio_sink");
+  video_queue = gst_element_factory_make ("queue", "video_queue");
+  visual = gst_element_factory_make ("wavescope", "visual");
+  video_convert = gst_element_factory_make ("videoconvert", "video_convert");
+  video_sink = gst_element_factory_make ("autovideosink", "video_sink");
+
+  /* Create the empty pipeline */
+  pipeline = gst_pipeline_new ("test-pipeline");
+
+  if (!pipeline || !audio_source || !tee || !audio_queue || !audio_convert
+      || !audio_resample || !audio_sink || !video_queue || !visual
+      || !video_convert || !video_sink) {
+    g_printerr ("Not all elements could be created.\n");
+    return -1;
+  }
+
+  /* Configure elements */
+  g_object_set (audio_source, "freq", 215.0f, NULL);
+  g_object_set (visual, "shader", 0, "style", 1, NULL);
+
+  /* Link all elements that can be automatically linked because they have "Always" pads */
+  gst_bin_add_many (GST_BIN (pipeline), audio_source, tee, audio_queue,
+      audio_convert, audio_resample, audio_sink, video_queue, visual,
+      video_convert, video_sink, NULL);
+  if (gst_element_link_many (audio_source, tee, NULL) != TRUE
+      || gst_element_link_many (audio_queue, audio_convert, audio_resample,
+          audio_sink, NULL) != TRUE
+      || gst_element_link_many (video_queue, visual, video_convert, video_sink,
+          NULL) != TRUE) {
+    g_printerr ("Elements could not be linked.\n");
+    gst_object_unref (pipeline);
+    return -1;
+  }
+
+  /* Manually link the Tee, which has "Request" pads */
+  tee_audio_pad = gst_element_request_pad_simple (tee, "src_%u");
+  g_print ("Obtained request pad %s for audio branch.\n",
+      gst_pad_get_name (tee_audio_pad));
+  queue_audio_pad = gst_element_get_static_pad (audio_queue, "sink");
+  tee_video_pad = gst_element_request_pad_simple (tee, "src_%u");
+  g_print ("Obtained request pad %s for video branch.\n",
+      gst_pad_get_name (tee_video_pad));
+  queue_video_pad = gst_element_get_static_pad (video_queue, "sink");
+  if (gst_pad_link (tee_audio_pad, queue_audio_pad) != GST_PAD_LINK_OK ||
+      gst_pad_link (tee_video_pad, queue_video_pad) != GST_PAD_LINK_OK) {
+    g_printerr ("Tee could not be linked.\n");
+    gst_object_unref (pipeline);
+    return -1;
+  }
+  gst_object_unref (queue_audio_pad);
+  gst_object_unref (queue_video_pad);
+
+  /* Start playing the pipeline */
+  gst_element_set_state (pipeline, GST_STATE_PLAYING);
+
+  /* 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);
+
+  /* Release the request pads from the Tee, and unref them */
+  gst_element_release_request_pad (tee, tee_audio_pad);
+  gst_element_release_request_pad (tee, tee_video_pad);
+  gst_object_unref (tee_audio_pad);
+  gst_object_unref (tee_video_pad);
+
+  /* Free resources */
+  if (msg != NULL)
+    gst_message_unref (msg);
+  gst_object_unref (bus);
+  gst_element_set_state (pipeline, GST_STATE_NULL);
+
+  gst_object_unref (pipeline);
+  return 0;
+}