2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
22 /* This example app demonstartes the use of pad query and convert to
23 * get useful statistics about a plugin. In this case we monitor the
24 * compression status of mpeg audio to ogg vorbis transcoding.
28 main (gint argc, gchar * argv[])
33 GstElement *encoder, *decoder;
34 GstPad *dec_sink, *enc_src;
36 gst_init (&argc, &argv);
39 g_print ("usage: %s <inputfile> <outputfile>\n", argv[0]);
43 description = g_strdup_printf ("filesrc location=\"%s\" ! mad name=decoder ! "
44 "vorbisenc name=encoder ! filesink location=\"%s\"", argv[1], argv[2]);
46 pipeline = GST_ELEMENT (gst_parse_launch (description, &error));
49 g_print ("ERROR: pipeline could not be constructed: %s\n",
52 g_print ("ERROR: pipeline could not be constructed\n");
56 decoder = gst_bin_get_by_name (GST_BIN (pipeline), "decoder");
57 encoder = gst_bin_get_by_name (GST_BIN (pipeline), "encoder");
59 dec_sink = gst_element_get_pad (decoder, "sink");
60 enc_src = gst_element_get_pad (encoder, "src");
62 if (gst_element_set_state (pipeline,
63 GST_STATE_PLAYING) != GST_STATE_CHANGE_SUCCESS) {
64 g_print ("pipeline doesn't want to play\n");
68 while (gst_bin_iterate (GST_BIN (pipeline))) {
71 gint64 bitrate_enc, bitrate_dec;
74 format = GST_FORMAT_TIME;
75 /* get the position */
76 gst_pad_query (enc_src, GST_QUERY_POSITION, &format, &position);
78 /* get the total duration */
79 gst_pad_query (enc_src, GST_QUERY_TOTAL, &format, &duration);
81 format = GST_FORMAT_BYTES;
82 /* see how many bytes are genereated per 8 seconds (== bitrate) */
83 gst_pad_convert (enc_src, GST_FORMAT_TIME, 8 * GST_SECOND,
84 &format, &bitrate_enc);
86 gst_pad_convert (dec_sink, GST_FORMAT_TIME, 8 * GST_SECOND,
87 &format, &bitrate_dec);
89 g_print ("[%2dm %.2ds] of [%2dm %.2ds], "
90 "src avg bitrate: %" G_GINT64_FORMAT ", dest avg birate: %"
91 G_GINT64_FORMAT ", ratio [%02.2f] \r",
92 (gint) (position / (GST_SECOND * 60)),
93 (gint) (position / (GST_SECOND)) % 60,
94 (gint) (duration / (GST_SECOND * 60)),
95 (gint) (duration / (GST_SECOND)) % 60, bitrate_dec, bitrate_enc,
96 (gfloat) bitrate_dec / bitrate_enc);