gstreamer/tests/examples/stepping/framestep1.c

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#include <stdlib.h>
#include <gst/gst.h>
static void
event_loop (GstElement * pipe)
{
GstBus *bus;
GstMessage *message = NULL;
gboolean running = TRUE;
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bus = gst_element_get_bus (GST_ELEMENT (pipe));
while (running) {
message = gst_bus_timed_pop_filtered (bus, -1, GST_MESSAGE_ANY);
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g_assert (message != NULL);
switch (message->type) {
case GST_MESSAGE_EOS:
g_message ("got EOS");
running = FALSE;
break;
case GST_MESSAGE_WARNING:{
GError *gerror;
gchar *debug;
gst_message_parse_warning (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
g_error_free (gerror);
g_free (debug);
break;
}
case GST_MESSAGE_ERROR:
{
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GError *gerror;
gchar *debug;
gst_message_parse_error (message, &gerror, &debug);
gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
g_error_free (gerror);
g_free (debug);
running = FALSE;
break;
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}
case GST_MESSAGE_STEP_DONE:
{
GstFormat format;
guint64 amount;
gdouble rate;
gboolean flush, intermediate;
guint64 duration;
gboolean eos;
gst_message_parse_step_done (message, &format, &amount, &rate,
&flush, &intermediate, &duration, &eos);
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if (format == GST_FORMAT_DEFAULT) {
g_message ("step done: %" GST_TIME_FORMAT " skipped in %"
G_GUINT64_FORMAT " frames", GST_TIME_ARGS (duration), amount);
} else {
g_message ("step done: %" GST_TIME_FORMAT " skipped",
GST_TIME_ARGS (duration));
}
break;
}
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default:
break;
}
gst_message_unref (message);
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}
gst_object_unref (bus);
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}
/* signalled when a new preroll buffer is available */
static void
new_preroll (GstElement * appsink, gpointer user_data)
{
GstBuffer *buffer;
g_signal_emit_by_name (appsink, "pull-preroll", &buffer);
g_message ("have new-preroll buffer %p, timestamp %" GST_TIME_FORMAT, buffer,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)));
gst_buffer_unref (buffer);
}
int
main (int argc, char *argv[])
{
GstElement *bin, *videotestsrc, *appsink;
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gint64 pos;
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gst_init (&argc, &argv);
/* create a new bin to hold the elements */
bin = gst_pipeline_new ("pipeline");
g_assert (bin);
/* create a fake source */
videotestsrc = gst_element_factory_make ("videotestsrc", "videotestsrc");
g_assert (videotestsrc);
g_object_set (videotestsrc, "num-buffers", 10, NULL);
/* and a fake sink */
appsink = gst_element_factory_make ("appsink", "appsink");
g_assert (appsink);
g_object_set (appsink, "emit-signals", TRUE, NULL);
g_object_set (appsink, "sync", TRUE, NULL);
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g_signal_connect (appsink, "new-preroll", (GCallback) new_preroll, NULL);
/* add objects to the main pipeline */
gst_bin_add (GST_BIN (bin), videotestsrc);
gst_bin_add (GST_BIN (bin), appsink);
/* link the elements */
gst_element_link_many (videotestsrc, appsink, NULL);
/* go to the PAUSED state and wait for preroll */
g_message ("prerolling first frame");
gst_element_set_state (bin, GST_STATE_PAUSED);
gst_element_get_state (bin, NULL, NULL, -1);
/* step two frames, flush so that new preroll is queued */
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g_message ("stepping three frames");
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g_assert (gst_element_send_event (bin,
gst_event_new_step (GST_FORMAT_BUFFERS, 2, 1.0, TRUE, FALSE)));
/* blocks and returns when we received the step done message */
event_loop (bin);
/* wait for step to really complete */
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gst_element_get_state (bin, NULL, NULL, -1);
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gst_element_query_position (bin, GST_FORMAT_TIME, &pos);
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g_message ("stepped two frames, now at %" GST_TIME_FORMAT,
GST_TIME_ARGS (pos));
/* step 3 frames, flush so that new preroll is queued */
g_message ("stepping 120 milliseconds ");
g_assert (gst_element_send_event (bin,
gst_event_new_step (GST_FORMAT_TIME, 120 * GST_MSECOND, 1.0, TRUE,
FALSE)));
/* blocks and returns when we received the step done message */
event_loop (bin);
/* wait for step to really complete */
gst_element_get_state (bin, NULL, NULL, -1);
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gst_element_query_position (bin, GST_FORMAT_TIME, &pos);
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g_message ("stepped 120ms frames, now at %" GST_TIME_FORMAT,
GST_TIME_ARGS (pos));
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g_message ("playing until EOS");
gst_element_set_state (bin, GST_STATE_PLAYING);
/* Run event loop listening for bus messages until EOS or ERROR */
event_loop (bin);
g_message ("finished");
/* stop the bin */
gst_element_set_state (bin, GST_STATE_NULL);
exit (0);
}