gstreamer/subprojects/gst-docs/examples/tutorials/basic-tutorial-13.c

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#include <string.h>
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#include <stdio.h>
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#include <gst/gst.h>
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typedef struct _CustomData
{
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GstElement *pipeline;
GstElement *video_sink;
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GMainLoop *loop;
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gboolean playing; /* Playing or Paused */
gdouble rate; /* Current playback rate (can be negative) */
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} CustomData;
/* Send seek event to change rate */
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static void
send_seek_event (CustomData * data)
{
gint64 position;
GstEvent *seek_event;
/* Obtain the current position, needed for the seek event */
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if (!gst_element_query_position (data->pipeline, GST_FORMAT_TIME, &position)) {
g_printerr ("Unable to retrieve current position.\n");
return;
}
/* Create the seek event */
if (data->rate > 0) {
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seek_event =
gst_event_new_seek (data->rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET,
position, GST_SEEK_TYPE_END, 0);
} else {
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seek_event =
gst_event_new_seek (data->rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, GST_SEEK_TYPE_SET, 0,
GST_SEEK_TYPE_SET, position);
}
if (data->video_sink == NULL) {
/* If we have not done so, obtain the sink through which we will send the seek events */
g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL);
}
/* Send the event */
gst_element_send_event (data->video_sink, seek_event);
g_print ("Current rate: %g\n", data->rate);
}
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/* Process keyboard input */
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static gboolean
handle_keyboard (GIOChannel * source, GIOCondition cond, CustomData * data)
{
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gchar *str = NULL;
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if (g_io_channel_read_line (source, &str, NULL, NULL,
NULL) != G_IO_STATUS_NORMAL) {
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return TRUE;
}
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switch (g_ascii_tolower (str[0])) {
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case 'p':
data->playing = !data->playing;
gst_element_set_state (data->pipeline,
data->playing ? GST_STATE_PLAYING : GST_STATE_PAUSED);
g_print ("Setting state to %s\n", data->playing ? "PLAYING" : "PAUSE");
break;
case 's':
if (g_ascii_isupper (str[0])) {
data->rate *= 2.0;
} else {
data->rate /= 2.0;
}
send_seek_event (data);
break;
case 'd':
data->rate *= -1.0;
send_seek_event (data);
break;
case 'n':
if (data->video_sink == NULL) {
/* If we have not done so, obtain the sink through which we will send the step events */
g_object_get (data->pipeline, "video-sink", &data->video_sink, NULL);
}
gst_element_send_event (data->video_sink,
gst_event_new_step (GST_FORMAT_BUFFERS, 1, ABS (data->rate), TRUE,
FALSE));
g_print ("Stepping one frame\n");
break;
case 'q':
g_main_loop_quit (data->loop);
break;
default:
break;
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}
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g_free (str);
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return TRUE;
}
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int
main (int argc, char *argv[])
{
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CustomData data;
GstStateChangeReturn ret;
GIOChannel *io_stdin;
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/* Initialize GStreamer */
gst_init (&argc, &argv);
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/* Initialize our data structure */
memset (&data, 0, sizeof (data));
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/* Print usage map */
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g_print ("USAGE: Choose one of the following options, then press enter:\n"
" 'P' to toggle between PAUSE and PLAY\n"
" 'S' to increase playback speed, 's' to decrease playback speed\n"
" 'D' to toggle playback direction\n"
" 'N' to move to next frame (in the current direction, better in PAUSE)\n"
" 'Q' to quit\n");
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/* Build the pipeline */
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data.pipeline =
gst_parse_launch
("playbin uri=https://www.freedesktop.org/software/gstreamer-sdk/data/media/sintel_trailer-480p.webm",
NULL);
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/* Add a keyboard watch so we get notified of keystrokes */
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#ifdef G_OS_WIN32
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io_stdin = g_io_channel_win32_new_fd (fileno (stdin));
#else
io_stdin = g_io_channel_unix_new (fileno (stdin));
#endif
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g_io_add_watch (io_stdin, G_IO_IN, (GIOFunc) handle_keyboard, &data);
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/* Start playing */
ret = gst_element_set_state (data.pipeline, GST_STATE_PLAYING);
if (ret == GST_STATE_CHANGE_FAILURE) {
g_printerr ("Unable to set the pipeline to the playing state.\n");
gst_object_unref (data.pipeline);
return -1;
}
data.playing = TRUE;
data.rate = 1.0;
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/* Create a GLib Main Loop and set it to run */
data.loop = g_main_loop_new (NULL, FALSE);
g_main_loop_run (data.loop);
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/* Free resources */
g_main_loop_unref (data.loop);
g_io_channel_unref (io_stdin);
gst_element_set_state (data.pipeline, GST_STATE_NULL);
if (data.video_sink != NULL)
gst_object_unref (data.video_sink);
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gst_object_unref (data.pipeline);
return 0;
}