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-rw-r--r--tests/examples/dynamic/sprinkle.c264
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diff --git a/tests/examples/dynamic/sprinkle.c b/tests/examples/dynamic/sprinkle.c
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--- a/tests/examples/dynamic/sprinkle.c
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-/* GStreamer
- *
- * sprinkle.c: sample application to dynamically mix tones with adder
- *
- * Copyright (C) <2009> Wim Taymans <wim dot taymans at gmail dot com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
- */
-
-/*
- * Produces a sweeping sprinkle of tones by dynamically adding and removing
- * elements to adder.
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <gst/gst.h>
-
-static GstElement *pipeline, *adder;
-static GMainLoop *loop;
-
-typedef struct
-{
- GstElement *element;
- GstPad *srcpad;
- GstPad *sinkpad;
- gdouble freq;
-} SourceInfo;
-
-/* dynamically add the source to the pipeline and link it to a new pad on
- * adder */
-static SourceInfo *
-add_source (gdouble freq)
-{
- SourceInfo *info;
-
- info = g_new0 (SourceInfo, 1);
- info->freq = freq;
-
- /* make source with unique name */
- info->element = gst_element_factory_make ("audiotestsrc", NULL);
-
- g_object_set (info->element, "freq", freq, NULL);
-
- /* add to the bin */
- gst_bin_add (GST_BIN (pipeline), info->element);
-
- /* get pad from the element */
- info->srcpad = gst_element_get_static_pad (info->element, "src");
-
- /* get new pad from adder, adder will now wait for data on this pad */
- info->sinkpad = gst_element_get_request_pad (adder, "sink%d");
-
- /* link pad to adder */
- gst_pad_link (info->srcpad, info->sinkpad);
-
- /* and play the element */
- gst_element_set_state (info->element, GST_STATE_PLAYING);
-
- g_print ("added freq %f\n", info->freq);
-
- return info;
-}
-
-/* remove the source from the pipeline after removing it from adder */
-static void
-remove_source (SourceInfo * info)
-{
- g_print ("remove freq %f\n", info->freq);
-
- /* lock the state so that we can put it to NULL without the parent messing
- * with our state */
- gst_element_set_locked_state (info->element, TRUE);
-
- /* first stop the source. Remember that this might block when in the PAUSED
- * state. Alternatively one could send EOS to the source, install an event
- * probe and schedule a state change/unlink/release from the mainthread.
- * Note that changing the state of a source makes it emit an EOS, which can
- * make adder go EOS. */
- gst_element_set_state (info->element, GST_STATE_NULL);
-
- /* unlink from adder */
- gst_pad_unlink (info->srcpad, info->sinkpad);
- gst_object_unref (info->srcpad);
-
- /* remove from the bin */
- gst_bin_remove (GST_BIN (pipeline), info->element);
-
- /* give back the pad */
- gst_element_release_request_pad (adder, info->sinkpad);
- gst_object_unref (info->sinkpad);
-
- g_free (info);
-}
-
-/* we'll keep the state of the sources in this structure. We keep 3 sources
- * alive */
-typedef struct
-{
- guint count;
- SourceInfo *infos[3];
-} SprinkleState;
-
-static SprinkleState *
-create_state (void)
-{
- SprinkleState *state;
-
- state = g_new0 (SprinkleState, 1);
-
- return state;
-}
-
-static void
-free_state (SprinkleState * state)
-{
- SourceInfo *info;
- gint i;
-
- for (i = 0; i < 3; i++) {
- info = state->infos[i];
- if (info)
- remove_source (info);
- }
-
- g_free (state);
-}
-
-static gboolean
-do_sprinkle (SprinkleState * state)
-{
- SourceInfo *info;
- gint i;
-
- /* first remove the oldest info */
- info = state->infos[2];
-
- if (info)
- remove_source (info);
-
- /* move sources */
- for (i = 2; i > 0; i--) {
- state->infos[i] = state->infos[i - 1];
- }
-
- /* add new source, stop adding sources after 10 rounds. */
- if (state->count < 10) {
- state->infos[0] = add_source ((state->count * 100) + 200);
- state->count++;
- } else {
- state->infos[0] = NULL;
- }
- return TRUE;
-}
-
-static void
-message_received (GstBus * bus, GstMessage * message, GstPipeline * pipeline)
-{
- const GstStructure *s;
-
- s = gst_message_get_structure (message);
- g_print ("message from \"%s\" (%s): ",
- GST_STR_NULL (GST_ELEMENT_NAME (GST_MESSAGE_SRC (message))),
- gst_message_type_get_name (GST_MESSAGE_TYPE (message)));
- if (s) {
- gchar *sstr;
-
- sstr = gst_structure_to_string (s);
- g_print ("%s\n", sstr);
- g_free (sstr);
- } else {
- g_print ("no message details\n");
- }
-}
-
-static void
-eos_message_received (GstBus * bus, GstMessage * message,
- GstPipeline * pipeline)
-{
- message_received (bus, message, pipeline);
- g_main_loop_quit (loop);
-}
-
-int
-main (int argc, char *argv[])
-{
- GstBus *bus;
- GstElement *filter, *convert, *sink;
- GstCaps *caps;
- gboolean res;
- SprinkleState *state;
-
- gst_init (&argc, &argv);
-
- loop = g_main_loop_new (NULL, TRUE);
-
- pipeline = gst_pipeline_new ("pipeline");
-
- /* add the fixed part to the pipeline. Remember that we need a capsfilter
- * after adder so that multiple sources are not racing to negotiate
- * a format */
- adder = gst_element_factory_make ("adder", "adder");
- filter = gst_element_factory_make ("capsfilter", "filter");
- convert = gst_element_factory_make ("audioconvert", "convert");
- sink = gst_element_factory_make ("autoaudiosink", "sink");
-
- caps = gst_caps_new_simple ("audio/x-raw-int",
- "endianness", G_TYPE_INT, G_LITTLE_ENDIAN,
- "channels", G_TYPE_INT, 1,
- "width", G_TYPE_INT, 16,
- "depth", G_TYPE_INT, 16,
- "rate", G_TYPE_INT, 44100, "signed", G_TYPE_BOOLEAN, TRUE, NULL);
- g_object_set (filter, "caps", caps, NULL);
- gst_caps_unref (caps);
-
- gst_bin_add_many (GST_BIN (pipeline), adder, filter, convert, sink, NULL);
-
- res = gst_element_link_many (adder, filter, convert, sink, NULL);
- g_assert (res);
-
- /* setup message handling */
- bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
- gst_bus_add_signal_watch_full (bus, G_PRIORITY_HIGH);
- g_signal_connect (bus, "message::error", (GCallback) message_received,
- pipeline);
- g_signal_connect (bus, "message::warning", (GCallback) message_received,
- pipeline);
- g_signal_connect (bus, "message::eos", (GCallback) eos_message_received,
- pipeline);
-
- /* we set the pipeline to PLAYING, the pipeline will not yet preroll because
- * there is no source providing data for it yet */
- gst_element_set_state (pipeline, GST_STATE_PLAYING);
-
- /* and add the function that modifies the pipeline every 100ms */
- state = create_state ();
- g_timeout_add (100, (GSourceFunc) do_sprinkle, state);
-
- /* go to main loop */
- g_main_loop_run (loop);
-
- gst_element_set_state (pipeline, GST_STATE_NULL);
-
- free_state (state);
- gst_object_unref (bus);
- gst_object_unref (pipeline);
-
- return 0;
-}