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d148ec0ad2
Add webm typefinder just for the release, so webm works for people whose distros don't patch gst-plugins-base as well. We'll remove this again after the release.
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/* GStreamer Matroska muxer/demuxer
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* (c) 2003 Ronald Bultje <rbultje@ronald.bitfreak.net>
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*
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* matroska.c: plugin loader
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "matroska-demux.h"
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#include "matroska-mux.h"
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#include "matroska-ids.h"
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#include "webm-mux.h"
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#include <string.h>
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/*** video/webm typefinder (temporary) ***/
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static GstStaticCaps webm_caps = GST_STATIC_CAPS ("video/webm");
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#define WEBM_CAPS (gst_static_caps_get(&webm_caps))
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static void
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webm_type_find (GstTypeFind * tf, gpointer ununsed)
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{
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static const guint8 webm_doctype[] = { 'w', 'e', 'b', 'm' };
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guint8 *data;
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gint len_mask = 0x80, size = 1, n = 1, total;
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/* 4 bytes for EBML ID, 1 byte for header length identifier */
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data = gst_type_find_peek (tf, 0, 4 + 1);
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if (!data)
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return;
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/* ebml header? */
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if (data[0] != 0x1A || data[1] != 0x45 || data[2] != 0xDF || data[3] != 0xA3)
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return;
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/* length of header */
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total = data[4];
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while (size <= 8 && !(total & len_mask)) {
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size++;
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len_mask >>= 1;
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}
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if (size > 8)
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return;
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total &= (len_mask - 1);
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while (n < size)
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total = (total << 8) | data[4 + n++];
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/* get new data for full header, 4 bytes for EBML ID,
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* EBML length tag and the actual header */
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data = gst_type_find_peek (tf, 0, 4 + size + total);
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if (!data)
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return;
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/* the header must contain the document type 'webm'. For now,
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* we don't parse the whole header but simply check for the
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* availability of that array of characters inside the header.
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* Not fully fool-proof, but good enough. */
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for (n = 4 + size; n <= 4 + size + total - sizeof (webm_doctype); n++) {
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if (!memcmp (&data[n], webm_doctype, sizeof (webm_doctype))) {
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gst_type_find_suggest (tf, GST_TYPE_FIND_MAXIMUM, WEBM_CAPS);
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return;
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}
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}
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}
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static gboolean
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plugin_init (GstPlugin * plugin)
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{
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static const gchar *webm_exts[] = { "webm", "weba", "webv", NULL };
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gboolean ret;
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gst_matroska_register_tags ();
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ret = gst_matroska_demux_plugin_init (plugin);
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ret &= gst_element_register (plugin, "matroskamux", GST_RANK_PRIMARY,
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GST_TYPE_MATROSKA_MUX);
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ret &= gst_element_register (plugin, "webmmux", GST_RANK_PRIMARY,
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GST_TYPE_WEBM_MUX);
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ret &= gst_type_find_register (plugin, "good-webm", GST_RANK_MARGINAL,
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webm_type_find, (gchar **) webm_exts, WEBM_CAPS, NULL, NULL);
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return ret;
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}
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GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"matroska",
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"Matroska and WebM stream handling",
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plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)
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