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106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/* Gnome-Streamer
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* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
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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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//#define DEBUG_ENABLED
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#include <gst/gst.h>
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#include <string.h> /* memcmp */
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static GstCaps* mp3_typefind(GstBuffer *buf, gpointer private);
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static GstTypeDefinition mp3type_definitions[] = {
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{ "mp3types_audio/mp3", "audio/mp3", ".mp3 .mp2 .mp1 .mpga", mp3_typefind },
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{ NULL, NULL, NULL, NULL },
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};
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static GstCaps*
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mp3_typefind(GstBuffer *buf, gpointer private)
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{
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gchar *data;
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gulong head;
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data = GST_BUFFER_DATA(buf);
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GstCaps *caps;
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GST_DEBUG (0,"mp3typefind: typefind\n");
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/* check for ID3 Tag first and forward ID3 length */
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if (!memcmp (data, "ID3", 3))
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{
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guint32 skip;
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/* ignore next 3 bytes */
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data += 6;
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/* if you want that thing faster, do it */
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skip = GUINT32_FROM_BE(*((guint32 *)data));
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skip = (((skip & 0x7f000000) >> 3) |
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((skip & 0x007f0000) >> 2) |
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((skip & 0x00007f00) >> 1) |
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((skip & 0x0000007f) >> 0)) + 4
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GST_DEBUG (0, "mp3typefind: detected ID3 Tag with %u bytes\n", skip + 6);
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/* return if buffer is not big enough */
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if (GST_BUFFER_SIZE (buf) < skip + 10)
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{
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GST_DEBUG (0, "mp3typefind: buffer too small to go on typefinding\n", skip + 6);
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return NULL;
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}
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data += skip;
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}
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/* now with the right postion, do typefinding */
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head = GULONG_FROM_BE(*((gulong *)data));
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if ((head & 0xffe00000) != 0xffe00000)
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return NULL;
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if (!((head >> 17) & 3))
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return NULL;
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if (((head >> 12) & 0xf) == 0xf)
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return NULL;
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if (!((head >> 12) & 0xf))
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return NULL;
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if (((head >> 10) & 0x3) == 0x3)
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return NULL;
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caps = gst_caps_new ("mp3_typefind", "audio/mp3", NULL);
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/* gst_caps_set(caps,"layer",GST_PROPS_INT(4-((head>>17)&0x3))); */
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return caps;
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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gint i=0;
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while (mp3type_definitions[i].name) {
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GstTypeFactory *type;
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type = gst_typefactory_new (&mp3type_definitions[i]);
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gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (type));
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i++;
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}
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/* gst_info("gsttypes: loaded %d mp3 types\n",i); */
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"mp3types",
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plugin_init
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};
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