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navseek: add basic support to change playback rate

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The following keys will now be interpreted by navseek:
 'f' means fast forward: the stream gets played at rate 2.0
 'r' means rewind: the stream gets played at rate -2.0
 'n' means normal: the stream gets played at rate 1.0

Fixes #631516.
This commit is contained in:
Guillaume Emont 2010-03-26 13:51:58 +01:00 committed by Mark Nauwelaerts
parent bdb4019678
commit 92720fa048
1 changed files with 42 additions and 0 deletions
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42
gst/debugutils/gstnavseek.c
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@ -148,6 +148,39 @@ gst_navseek_seek (GstNavSeek * navseek, gint64 offset)
gst_object_unref (peer_pad); gst_object_unref (peer_pad);
} }
static void
gst_navseek_change_playback_rate (GstNavSeek * navseek, gdouble rate)
{
GstFormat peer_format = GST_FORMAT_TIME;
gboolean ret;
GstPad *peer_pad;
gint64 current_position;
peer_pad = gst_pad_get_peer (GST_BASE_TRANSFORM (navseek)->sinkpad);
ret = gst_pad_query_position (peer_pad, &peer_format, &current_position);
if (ret && peer_format == GST_FORMAT_TIME) {
GstEvent *event;
gint64 start;
gint64 stop;
if (rate > 0.0) {
start = current_position;
stop = -1;
} else {
/* negative rate: we play from stop to start */
start = 0;
stop = current_position;
}
event = gst_event_new_seek (rate, GST_FORMAT_TIME,
GST_SEEK_FLAG_ACCURATE | GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_SKIP,
GST_SEEK_TYPE_SET, start, GST_SEEK_TYPE_SET, stop);
gst_pad_send_event (peer_pad, event);
}
}
static void static void
gst_navseek_segseek (GstNavSeek * navseek) gst_navseek_segseek (GstNavSeek * navseek)
{ {
@ -221,6 +254,15 @@ gst_navseek_handle_src_event (GstPad * pad, GstEvent * event)
/* Toggle the loop flag. If we have both start and end segment times send a seek */ /* Toggle the loop flag. If we have both start and end segment times send a seek */
navseek->loop = !navseek->loop; navseek->loop = !navseek->loop;
gst_navseek_segseek (navseek); gst_navseek_segseek (navseek);
} else if (strcmp (key, "f") == 0) {
/* fast forward */
gst_navseek_change_playback_rate (navseek, 2.0);
} else if (strcmp (key, "r") == 0) {
/* rewind */
gst_navseek_change_playback_rate (navseek, -2.0);
} else if (strcmp (key, "n") == 0) {
/* normal speed */
gst_navseek_change_playback_rate (navseek, 1.0);
} }
} else { } else {
break; break;