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5b9c84091d
Original commit message from CVS: * gst/base/gsttypefindhelper.c: (helper_find_peek): * gst/elements/gsttypefindelement.c: (find_peek): Handle negative offsets better. Fixes decodebin.
135 lines
3 KiB
C
135 lines
3 KiB
C
/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000,2005 Wim Taymans <wim@fluendo.com>
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*
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* gsttypefindhelper.c:
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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 <stdlib.h>
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#include <string.h>
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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 "gsttypefindhelper.h"
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/**
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* typefind code here
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*/
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typedef struct
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{
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GstPad *src;
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guint best_probability;
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GstCaps *caps;
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guint64 size;
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GstBuffer *buffer;
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}
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GstTypeFindHelper;
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static guint8 *
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helper_find_peek (gpointer data, gint64 offset, guint size)
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{
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GstTypeFindHelper *find;
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GstBuffer *buffer;
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GstPad *src;
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GstFlowReturn ret;
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if (size == 0)
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return NULL;
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find = (GstTypeFindHelper *) data;
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src = find->src;
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if (offset < 0) {
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if (find->size == -1 || find->size < -offset)
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return NULL;
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offset += find->size;
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}
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buffer = NULL;
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ret = GST_RPAD_GETRANGEFUNC (src) (src, offset, size, &buffer);
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if (find->buffer) {
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gst_buffer_unref (find->buffer);
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find->buffer = NULL;
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}
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if (ret != GST_FLOW_OK)
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goto error;
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find->buffer = buffer;
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return GST_BUFFER_DATA (buffer);
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error:
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{
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return NULL;
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}
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}
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static void
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helper_find_suggest (gpointer data, guint probability, const GstCaps * caps)
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{
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GstTypeFindHelper *find = (GstTypeFindHelper *) data;
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if (probability > find->best_probability) {
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GstCaps *copy = gst_caps_copy (caps);
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gst_caps_replace (&find->caps, copy);
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gst_caps_unref (copy);
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find->best_probability = probability;
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}
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}
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GstCaps *
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gst_type_find_helper (GstPad * src, guint64 size)
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{
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GstTypeFind gst_find;
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GstTypeFindHelper find;
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GList *walk, *type_list = NULL;
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GstCaps *result = NULL;
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walk = type_list = gst_type_find_factory_get_list ();
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find.src = src;
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find.best_probability = 0;
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find.caps = NULL;
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find.size = size;
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find.buffer = NULL;
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gst_find.data = &find;
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gst_find.peek = helper_find_peek;
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gst_find.suggest = helper_find_suggest;
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gst_find.get_length = NULL;
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while (walk) {
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
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gst_type_find_factory_call_function (factory, &gst_find);
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if (find.best_probability >= GST_TYPE_FIND_MAXIMUM)
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break;
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walk = g_list_next (walk);
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}
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if (find.best_probability > 0)
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result = find.caps;
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return result;
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}
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