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gst-play: support changing the playback rate in interactive mode

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It is fun to have this feature, also it is useful for testing decoders.

https://bugzilla.gnome.org/show_bug.cgi?id=745174
This commit is contained in:
Víctor Manuel Jáquez Leal 2015-02-25 18:52:11 +01:00 committed by Tim-Philipp Müller
parent 621292e754
commit c243f386c9
1 changed files with 60 additions and 0 deletions
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60
tools/gst-play.c
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@ -625,10 +625,58 @@ seek_failed:
}
}
static void
change_rate (GstPlay * play, gdouble rate)
{
GstQuery *query;
GstEvent *seek;
gboolean seekable = FALSE;
gint64 pos = -1;
g_return_if_fail (rate != 0 && rate >= -10.0 && rate <= 10.0);
if (!gst_element_query_position (play->playbin, GST_FORMAT_TIME, &pos))
goto seek_failed;
query = gst_query_new_seeking (GST_FORMAT_TIME);
if (!gst_element_query (play->playbin, query)) {
gst_query_unref (query);
goto seek_failed;
}
gst_query_parse_seeking (query, NULL, &seekable, NULL, NULL);
gst_query_unref (query);
if (!seekable)
goto seek_failed;
if (rate > 0)
seek = gst_event_new_seek (rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT,
/* start */ GST_SEEK_TYPE_SET, pos,
/* stop */ GST_SEEK_TYPE_NONE, 0);
else
seek = gst_event_new_seek (rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE,
/* start */ GST_SEEK_TYPE_SET, 0,
/* stop */ GST_SEEK_TYPE_SET, pos);
if (!gst_element_send_event (play->playbin, seek))
goto seek_failed;
return;
seek_failed:
{
g_print ("\nCould not seek.\n");
}
}
static void
keyboard_cb (const gchar * key_input, gpointer user_data)
{
GstPlay *play = (GstPlay *) user_data;
static gdouble rate = 1.0;
switch (g_ascii_tolower (key_input[0])) {
case ' ':
@ -647,6 +695,18 @@ keyboard_cb (const gchar * key_input, gpointer user_data)
case '<':
play_prev (play);
break;
case '+':
rate += 0.5;
change_rate (play, rate);
break;
case '-':
rate -= 0.5;
change_rate (play, rate);
break;
case 'd':
rate *= -1.0;
change_rate (play, rate);
break;
case 27: /* ESC */
if (key_input[1] == '\0') {
g_main_loop_quit (play->loop);