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173 lines
5.3 KiB
C
173 lines
5.3 KiB
C
/* GStreamer
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*
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* Copyright (C) 2010 Wim Taymans <wim.taymans@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/* An example of synchronized playback and recording.
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* The trick is to wait for the playback pipeline to preroll before starting
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* playback and recording.
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*/
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#include <string.h>
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#include <gst/gst.h>
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/* Define to run the asynchronous version, which has the benefit that it doesn't
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* block the main thread but it produces slightly less clear code. */
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#define ASYNC_VERSION
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static GMainLoop *loop;
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static GstElement *pipeline = NULL;
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static GstElement *play_bin, *play_source, *play_sink;
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static GstElement *rec_bin, *rec_source, *rec_sink;
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static gboolean
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message_handler (GstBus * bus, GstMessage * message, gpointer user_data)
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{
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switch (GST_MESSAGE_TYPE (message)) {
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#ifdef ASYNC_VERSION
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case GST_MESSAGE_ELEMENT:{
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const GstStructure *str;
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str = gst_message_get_structure (message);
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if (gst_structure_has_name (str, "GstBinForwarded")) {
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GstMessage *orig;
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/* unwrap the element message */
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gst_structure_get (str, "message", GST_TYPE_MESSAGE, &orig, NULL);
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g_assert (orig);
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switch (GST_MESSAGE_TYPE (orig)) {
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case GST_MESSAGE_ASYNC_DONE:
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g_print ("ASYNC done %s\n", GST_MESSAGE_SRC_NAME (orig));
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if (GST_MESSAGE_SRC (orig) == GST_OBJECT_CAST (play_bin)) {
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g_print
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("prerolled, starting synchronized playback and recording\n");
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/* returns ASYNC because the sink linked to the live source is not
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* prerolled */
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if (gst_element_set_state (pipeline,
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GST_STATE_PLAYING) != GST_STATE_CHANGE_ASYNC) {
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g_warning ("State change failed");
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}
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}
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break;
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default:
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break;
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}
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}
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break;
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}
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#endif
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case GST_MESSAGE_EOS:
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g_print ("EOS\n");
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g_main_loop_quit (loop);
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break;
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case GST_MESSAGE_ERROR:{
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GError *err = NULL;
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gst_message_parse_error (message, &err, NULL);
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g_print ("error: %s\n", err->message);
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g_clear_error (&err);
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g_main_loop_quit (loop);
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break;
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}
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default:
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break;
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}
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return TRUE;
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}
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int
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main (int argc, char *argv[])
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{
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GstBus *bus;
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gint watch_id;
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gst_init (NULL, NULL);
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loop = g_main_loop_new (NULL, TRUE);
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pipeline = gst_pipeline_new ("pipeline");
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#ifdef ASYNC_VERSION
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/* this enables messages of individual elements inside the pipeline */
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g_object_set (pipeline, "message-forward", TRUE, NULL);
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#endif
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/* make a bin with the playback elements this is a non-live pipeline */
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play_bin = gst_bin_new ("play_bin");
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play_source = gst_element_factory_make ("audiotestsrc", "play_source");
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play_sink = gst_element_factory_make ("autoaudiosink", "play_sink");
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gst_bin_add (GST_BIN (play_bin), play_source);
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gst_bin_add (GST_BIN (play_bin), play_sink);
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gst_element_link (play_source, play_sink);
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/* make bin with the record elements, this is a live pipeline */
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rec_bin = gst_bin_new ("rec_bin");
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rec_source = gst_element_factory_make ("autoaudiosrc", "rec_source");
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rec_sink = gst_element_factory_make ("fakesink", "rec_sink");
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gst_bin_add (GST_BIN (rec_bin), rec_source);
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gst_bin_add (GST_BIN (rec_bin), rec_sink);
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gst_element_link (rec_source, rec_sink);
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gst_bin_add (GST_BIN (pipeline), play_bin);
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gst_bin_add (GST_BIN (pipeline), rec_bin);
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bus = gst_element_get_bus (pipeline);
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watch_id = gst_bus_add_watch (bus, message_handler, NULL);
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gst_object_unref (bus);
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g_print ("going to PAUSED\n");
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/* returns NO_PREROLL because we have a live element */
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if (gst_element_set_state (pipeline,
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GST_STATE_PAUSED) != GST_STATE_CHANGE_NO_PREROLL) {
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g_warning ("Expected state change NO_PREROLL result");
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}
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g_print ("waiting for playback preroll\n");
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#ifndef ASYNC_VERSION
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/* sync wait for preroll on the playback bin and then go to PLAYING */
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if (gst_element_get_state (play_bin, NULL, NULL,
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GST_CLOCK_TIME_NONE) != GST_STATE_CHANGE_SUCCESS) {
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g_warning ("Error while waiting for state change");
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}
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g_print ("prerolled, starting synchronized playback and recording\n");
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/* returns ASYNC because the sink linked to the live source is not
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* prerolled */
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if (gst_element_set_state (pipeline,
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GST_STATE_PLAYING) != GST_STATE_CHANGE_ASYNC) {
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g_warning ("Expected state change NO_PREROLL result");
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}
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#endif
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g_main_loop_run (loop);
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g_source_remove (watch_id);
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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g_main_loop_unref (loop);
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return 0;
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}
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