diff --git a/tests/examples/dynamic/.gitignore b/tests/examples/dynamic/.gitignore index b12477eaae..7af9515a9f 100644 --- a/tests/examples/dynamic/.gitignore +++ b/tests/examples/dynamic/.gitignore @@ -1,2 +1,3 @@ addstream codec-select +sprinkle diff --git a/tests/examples/dynamic/Makefile.am b/tests/examples/dynamic/Makefile.am index 0ab601f708..5a1ff2674a 100644 --- a/tests/examples/dynamic/Makefile.am +++ b/tests/examples/dynamic/Makefile.am @@ -1,4 +1,4 @@ -noinst_PROGRAMS = addstream codec-select +noinst_PROGRAMS = addstream codec-select sprinkle addstream_SOURCES = addstream.c addstream_CFLAGS = $(GST_CFLAGS) -D_GNU_SOURCE @@ -7,3 +7,7 @@ addstream_LDFLAGS = $(GST_LIBS) codec_select_SOURCES = codec-select.c codec_select_CFLAGS = $(GST_CFLAGS) -D_GNU_SOURCE codec_select_LDFLAGS = $(GST_LIBS) + +sprinkle_SOURCES = sprinkle.c +sprinkle_CFLAGS = $(GST_CFLAGS) -D_GNU_SOURCE +sprinkle_LDFLAGS = $(GST_LIBS) diff --git a/tests/examples/dynamic/sprinkle.c b/tests/examples/dynamic/sprinkle.c new file mode 100644 index 0000000000..d9641652b9 --- /dev/null +++ b/tests/examples/dynamic/sprinkle.c @@ -0,0 +1,262 @@ +/* GStreamer + * + * sprinkle.c: sample application to dynamically mix tones with adder + * + * Copyright (C) <2009> Wim Taymans + * + * 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 + +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. */ + 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; +}