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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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 "riff.h"
GstRiffParse*
gst_riff_parse_new (GstPad *pad)
{
GstRiffParse *parse;
parse = g_new0 (GstRiffParse, 1);
parse->pad = pad;
parse->bs = gst_bytestream_new (pad);
return parse;
}
void
gst_riff_parse_free (GstRiffParse *parse)
{
gst_bytestream_destroy (parse->bs);
g_free (parse);
}
static GstRiffReturn
gst_riff_parse_handle_sink_event (GstRiffParse *parse)
{
guint32 remaining;
GstEvent *event;
GstEventType type;
GstRiffReturn ret = GST_RIFF_OK;
gst_bytestream_get_status (parse->bs, &remaining, &event);
type = event? GST_EVENT_TYPE (event) : GST_EVENT_UNKNOWN;
switch (type) {
case GST_EVENT_EOS:
ret = GST_RIFF_EOS;
break;
default:
g_warning ("unhandled event %d", type);
break;
}
gst_event_unref (event);
return ret;
}
GstRiffReturn
gst_riff_parse_next_chunk (GstRiffParse *parse, guint32 *id, GstBuffer **buf)
{
GstByteStream *bs;
guint32 got_bytes;
gint skipsize;
gst_riff_chunk *chunk;
bs = parse->bs;
do {
got_bytes = gst_bytestream_peek_bytes (bs, (guint8 **) &chunk, sizeof (gst_riff_chunk));
if (got_bytes < sizeof (gst_riff_chunk)) {
GstRiffReturn ret;
ret = gst_riff_parse_handle_sink_event (parse);
if (ret == GST_RIFF_EOS)
return ret;
}
} while (got_bytes != sizeof (gst_riff_chunk));
*id = chunk->id;
switch (chunk->id) {
case GST_RIFF_TAG_RIFF:
case GST_RIFF_TAG_LIST:
skipsize = sizeof (gst_riff_list);
break;
default:
skipsize = (chunk->size + 8 + 1) & ~1;
break;
}
do {
got_bytes = gst_bytestream_read (bs, buf, skipsize);
if (got_bytes < skipsize) {
GstRiffReturn ret;
ret = gst_riff_parse_handle_sink_event (parse);
if (ret == GST_RIFF_EOS)
return ret;
}
} while (got_bytes != skipsize);
return GST_RIFF_OK;
}
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