gstreamer/subprojects/gst-plugins-base/tests/examples/seek/instant-rate-change.c

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/* Test example for instant rate changes.
* The example takes an input URI and runs a set of actions,
* seeking and pausing etc.
*
* Copyright (C) 2015-2018 Centricular Ltd
* @author: Edward Hervey <edward@centricular.com>
* @author: Jan Schmidt <jan@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include <glib-object.h>
#include <glib/gprintf.h>
#include <gst/gst.h>
#include <stdlib.h>
/* There are several supported scenarios
0) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> Apply 'instant-rate-change' to 0.25x (repeat as fast as possible for 2 sec) -> let play for 2s
1) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> wait 10s -> play
2) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> wait 10s -> Apply 'instant-rate-change' to 1x -> play
3) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> seeking (flush+key-unit) to 30s -> wait 10s -> play
4) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> Apply 'instant-rate-change' to 0.25x (toggle every 500ms)
*/
#define PLAY_PAUSE_DELAY 10
#define IDLE_CYCLE_DELAY 2
#define TARGET_RATE_1 0.25
#define TARGET_RATE_2 2.0
/* Set DISABLE_AUDIO to run with video only */
// #define DISABLE_AUDIO
/* Set to force the use of the system clock on the pipeline */
// #define FORCE_SYSTEM_CLOCK
typedef struct _MyDataStruct
{
GMainLoop *mainloop;
GstElement *pipeline;
GstBus *bus;
gdouble rate;
gboolean paused;
guint scenario;
GstClockTime start;
GstClock *clock;
guint timeout_id;
guint idle_id;
} MyDataStruct;
static gboolean toggle_rate (MyDataStruct * data);
static gboolean
do_enable_disable_idle (MyDataStruct * data)
{
if (data->idle_id) {
g_print ("Disabling idle handler\n");
g_source_remove (data->idle_id);
data->idle_id = 0;
} else {
g_print ("Enabling idle handler\n");
data->idle_id = g_idle_add ((GSourceFunc) toggle_rate, data);
}
return TRUE;
}
static gboolean
do_play_pause (MyDataStruct * data)
{
data->paused = !data->paused;
switch (data->scenario) {
case 1:
g_print ("%s\n", data->paused ? "Pausing" : "Unpausing");
gst_element_set_state (data->pipeline,
data->paused ? GST_STATE_PAUSED : GST_STATE_PLAYING);
data->timeout_id = g_timeout_add_seconds (PLAY_PAUSE_DELAY,
(GSourceFunc) do_play_pause, data);
break;
case 2:
if (!data->paused) {
gint64 pos = GST_CLOCK_TIME_NONE;
gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &pos);
/* Change rate between 2x and 1x before unpausing */
data->rate = (data->rate == 2.0) ? 1.0 : 2.0;
g_print ("Switching rate to %f (position %" GST_TIME_FORMAT ")\n",
data->rate, GST_TIME_ARGS (pos));
gst_element_send_event (data->pipeline, gst_event_new_seek (data->rate,
GST_FORMAT_TIME, GST_SEEK_FLAG_INSTANT_RATE_CHANGE,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE, GST_SEEK_TYPE_NONE,
GST_CLOCK_TIME_NONE));
}
g_print ("%s\n", data->paused ? "Pausing" : "Unpausing");
gst_element_set_state (data->pipeline,
data->paused ? GST_STATE_PAUSED : GST_STATE_PLAYING);
data->timeout_id = g_timeout_add_seconds (PLAY_PAUSE_DELAY,
(GSourceFunc) do_play_pause, data);
break;
case 3:
g_print ("%s\n", data->paused ? "Pausing" : "Unpausing");
gst_element_set_state (data->pipeline,
data->paused ? GST_STATE_PAUSED : GST_STATE_PLAYING);
if (data->paused) {
/* On pause, seek to 30 seconds */
g_print ("Seeking to 30s\n");
gst_element_send_event (data->pipeline,
gst_event_new_seek (data->rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
GST_SEEK_TYPE_SET, 30 * GST_SECOND,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE));
}
data->timeout_id = g_timeout_add_seconds (PLAY_PAUSE_DELAY,
(GSourceFunc) do_play_pause, data);
break;
default:
break;
}
return FALSE;
}
static gboolean
toggle_rate (MyDataStruct * data)
{
gint64 pos = GST_CLOCK_TIME_NONE;
gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &pos);
/* Toggle rate between the 2 target rates */
if (data->rate != TARGET_RATE_2)
data->rate = TARGET_RATE_2;
else
data->rate = TARGET_RATE_1;
g_print ("Switching rate to %f (position %" GST_TIME_FORMAT ")\n", data->rate,
GST_TIME_ARGS (pos));
gst_element_send_event (data->pipeline, gst_event_new_seek (data->rate,
GST_FORMAT_TIME, GST_SEEK_FLAG_INSTANT_RATE_CHANGE,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE, GST_SEEK_TYPE_NONE,
GST_CLOCK_TIME_NONE));
return TRUE;
}
static void
on_preroll (MyDataStruct * data)
{
if (data->timeout_id != 0)
return; /* Already scheduled out scenario timer */
switch (data->scenario) {
case 0:
data->idle_id = g_idle_add ((GSourceFunc) toggle_rate, data);
data->timeout_id = g_timeout_add_seconds (IDLE_CYCLE_DELAY,
(GSourceFunc) do_enable_disable_idle, data);
break;
case 1:
case 2:
case 3:{
gint64 pos = GST_CLOCK_TIME_NONE;
gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &pos);
/* Change rate to 2x and play for 10 sec, pause for 10 sec */
data->rate = 2.0;
g_print ("Switching rate to %f (position %" GST_TIME_FORMAT ")\n",
data->rate, GST_TIME_ARGS (pos));
gst_element_send_event (data->pipeline, gst_event_new_seek (data->rate,
GST_FORMAT_TIME, GST_SEEK_FLAG_INSTANT_RATE_CHANGE,
GST_SEEK_TYPE_NONE, GST_CLOCK_TIME_NONE, GST_SEEK_TYPE_NONE,
GST_CLOCK_TIME_NONE));
/* Instant rate change completed, schedule play/pause */
data->timeout_id = g_timeout_add_seconds (PLAY_PAUSE_DELAY,
(GSourceFunc) do_play_pause, data);
break;
}
case 4:
g_timeout_add (250, (GSourceFunc) toggle_rate, data);
break;
default:
break;
}
}
static gboolean
_on_bus_message (GstBus * bus, GstMessage * message, gpointer userdata)
{
MyDataStruct *data = (MyDataStruct *) (userdata);
switch (GST_MESSAGE_TYPE (message)) {
case GST_MESSAGE_ERROR:{
GError *err = NULL;
gchar *name = gst_object_get_path_string (GST_MESSAGE_SRC (message));
gst_message_parse_error (message, &err, NULL);
g_printerr ("ERROR: from element %s: %s\n", name, err->message);
g_error_free (err);
g_free (name);
g_printf ("Stopping\n");
g_main_loop_quit (data->mainloop);
break;
}
case GST_MESSAGE_EOS:
g_printf ("EOS ! Stopping \n");
g_main_loop_quit (data->mainloop);
break;
case GST_MESSAGE_ASYNC_DONE:
on_preroll (data);
break;
default:
break;
}
return TRUE;
}
static gchar *
cmdline_to_uri (const gchar * arg)
{
if (gst_uri_is_valid (arg))
return g_strdup (arg);
return gst_filename_to_uri (arg, NULL);
}
static void
print_usage (const char *arg0)
{
g_print
("Usage: %s <0-4> URI\nSelect test scenario 0 to 4, and supply a URI to test\n",
arg0);
g_print ("Scenarios:\n"
" 0) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> Apply 'instant-rate-change' to 0.25x (repeat as fast as possible for 2 sec) -> let play for 2s\n"
" 1) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> wait 10s -> play\n"
" 2) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> wait 10s -> Apply 'instant-rate-change' to 1x -> play\n"
" 3) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> run for 10s, then pause -> seeking (flush+key-unit) to 30s -> wait 10s -> play\n"
" 4) Play rate to 1x -> Apply 'instant-rate-change' to 2x -> Apply 'instant-rate-change' to 0.25x (toggle every 500ms)\n");
}
int
main (int argc, gchar ** argv)
{
GstBus *bus;
MyDataStruct *data;
gchar *uri;
#ifdef FORCE_SYSTEM_CLOCK
GstClock *clock;
#endif
gst_init (&argc, &argv);
data = g_new0 (MyDataStruct, 1);
if (argc < 3) {
print_usage (argv[0]);
return 1;
}
data->scenario = atoi (argv[1]);
uri = cmdline_to_uri (argv[2]);
if (data->scenario > 4 || uri == NULL) {
print_usage (argv[0]);
return 1;
}
data->pipeline = gst_element_factory_make ("playbin", NULL);
if (data->pipeline == NULL) {
g_printerr ("Failed to create playbin element. Aborting");
return 1;
}
#ifdef FORCE_SYSTEM_CLOCK
clock = gst_system_clock_obtain ();
gst_pipeline_use_clock (GST_PIPELINE (data->pipeline), clock);
#endif
#ifdef DISABLE_AUDIO
g_object_set (data->pipeline, "flags", 0x00000615, NULL);
#endif
g_object_set (data->pipeline, "uri", uri, NULL);
g_free (uri);
/* Put a bus handler */
bus = gst_pipeline_get_bus (GST_PIPELINE (data->pipeline));
gst_bus_add_watch (bus, _on_bus_message, data);
/* Start pipeline */
data->mainloop = g_main_loop_new (NULL, TRUE);
gst_element_set_state (data->pipeline, GST_STATE_PLAYING);
g_main_loop_run (data->mainloop);
gst_element_set_state (data->pipeline, GST_STATE_NULL);
gst_object_unref (data->pipeline);
gst_object_unref (bus);
return 0;
}