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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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86 lines
2.4 KiB
C
86 lines
2.4 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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#include <gtk/gtk.h>
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#include <gst/gst.h>
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gint mp3_typefind(GstBuffer *buf,gpointer *private);
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gint wav_typefind(GstBuffer *buf,gpointer *private);
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GstTypeFactory _factories[] = {
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{ "audio/raw", ".raw", NULL },
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{ "audio/mpeg audio/mp3", ".mp2 .mp3 .mpa .mpega", mp3_typefind },
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{ "audio/wav", ".wav", wav_typefind },
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{ "audio/ac3", ".ac3", NULL },
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{ NULL, NULL, NULL },
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};
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/* check to see if a buffer indicates the presence of an mp3 frame
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* NOTE that this only checks for a potentially valid mp3 frame header
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* and doesn't guarantee that it's a fully valid mp3 audio stream */
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gboolean mp3_typefind(GstBuffer *buf,gpointer *private) {
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gulong head = GULONG_FROM_BE(*((gulong *)GST_BUFFER_DATA(buf)));
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if ((head & 0xffe00000) != 0xffe00000)
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return FALSE;
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if (!((head >> 17) & 3))
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return FALSE;
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if (((head >> 12) & 0xf) == 0xf)
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return FALSE;
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if (!((head >> 12) & 0xf))
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return FALSE;
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if (((head >> 10) & 0x3) == 0x3)
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return FALSE;
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return TRUE;
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}
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gboolean wav_typefind(GstBuffer *buf,gpointer *private) {
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gulong *data = (gulong *)GST_BUFFER_DATA(buf);
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if (data[0] != "RIFF") return FALSE;
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if (data[2] != "WAVE") return FALSE;
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return TRUE;
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}
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GstPlugin *plugin_init(GModule *module) {
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GstPlugin *plugin;
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int i = 0;
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if (gst_plugin_find("gsttypes") != NULL)
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return NULL;
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plugin = gst_plugin_new("gsttypes");
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g_return_val_if_fail(plugin != NULL,NULL);
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while (_factories[i].mime) {
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gst_type_register(&_factories[i]);
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// DEBUG("added factory #%d '%s'\n",i,_factories[i].mime);
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i++;
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}
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gst_info("gsttypes: loaded %d standard types\n",i);
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return plugin;
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}
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