gstreamer/gst/utils/gstbytestream.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstbytestreams.c: Utility functions: gtk_get_property stuff, etc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <string.h>
#include "gstbytestreams.h"
/**
* gst_bytestream_new:
* @pad: the pad to attach the bytstream to
*
* creates a bytestream from the given pad
*
* Returns: a new #GstByteStream object
*/
GstByteStream*
gst_bytestream_new (GstPad *pad)
{
GstByteStream *bs = g_new(GstByteStream, 1);
bs->pad = pad;
bs->data = NULL;
bs->size = 0;
bs->index = 0;
return bs;
}
void
gst_bytestream_destroy (GstByteStream *bs)
{
if (bs->data) {
g_free(bs->data);
}
g_free(bs);
}
static void
gst_bytestream_bytes_fill (GstByteStream *bs, guint64 len)
{
size_t oldlen;
GstBuffer *buf;
while ((bs->index + len) > bs->size) {
buf = gst_pad_pull(bs->pad);
oldlen = bs->size - bs->index;
memmove(bs->data, bs->data + bs->index, oldlen);
bs->size = oldlen + GST_BUFFER_SIZE(buf);
bs->index = 0;
bs->data = realloc(bs->data, bs->size);
if (!bs->data) {
fprintf(stderr, "realloc failed: d:%p s:%d\n", bs->data, bs->size);
}
memcpy(bs->data + oldlen, GST_BUFFER_DATA(buf), GST_BUFFER_SIZE(buf));
}
g_assert ((bs->index + len) <= bs->size);
}
guint8*
gst_bytestream_bytes_peek (GstByteStream *bs, guint64 len)
{
g_return_val_if_fail (len > 0, NULL);
gst_bytestream_bytes_fill (bs, len);
return gst_bytestream_pos (bs);
}
guint8*
gst_bytestream_bytes_read (GstByteStream *bs, guint64 len)
{
guint8 *ptr;
g_return_val_if_fail (len > 0, NULL);
gst_bytestream_bytes_fill(bs, len);
ptr = gst_bytestream_pos(bs);
bs->index += len;
return ptr;
}
gboolean
gst_bytestream_bytes_seek (GstByteStream *bs, guint64 offset)
{
return FALSE;
}
void
gst_bytestream_bytes_flush (GstByteStream *bs, guint64 len)
{
gst_bytestream_bytes_read(bs, len);
}