[FFmpeg-soc] [soc]: r1191 - qcelp/qcelp_parser.c
reynaldo
subversion at mplayerhq.hu
Sat Aug 25 23:42:14 CEST 2007
Author: reynaldo
Date: Sat Aug 25 23:42:14 2007
New Revision: 1191
Log:
Adds missing qcelp_parcer.c draft
Added:
qcelp/qcelp_parser.c
Added: qcelp/qcelp_parser.c
==============================================================================
--- (empty file)
+++ qcelp/qcelp_parser.c Sat Aug 25 23:42:14 2007
@@ -0,0 +1,109 @@
+/*
+ * QCELP parser
+ * Copyright (c) 2007 Reynaldo H. Verdejo Pinochet
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file qcelp_parser.c
+ * QCELP parser
+ * @author Reynaldo H. Verdejo Pinochet
+ */
+
+#include "parser.h"
+#include "qcelpdata.h"
+
+
+/**
+ * finds the end of the current frame in the bitstream.
+ * @return the position of the first byte of the next frame, or -1
+ */
+
+static int qcelp_find_frame_end(ParseContext *pc, const uint8_t *buf,
+ int buf_size)
+{
+ if(buf_size < 3)
+ return END_NOT_FOUND;
+
+ switch(buf_size)
+ {
+ case 35:
+ case 34:
+ case 17:
+ case 16:
+ case 8:
+ case 7:
+ case 4:
+ case 3:
+ return buf_size;
+ }
+
+ switch(buf[0])
+ {
+ case 4:
+ return 35;
+ case 3:
+ return 17;
+ case 2:
+ return 8;
+ case 1:
+ return 4;
+ }
+
+ return END_NOT_FOUND;
+}
+
+static int qcelp_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf,
+ int buf_size)
+{
+ int next;
+
+ ParseContext *pc = s->priv_data;
+ int start_found = pc->frame_start_found;
+ uint32_t state = pc->state;
+
+ start_found=1;
+
+ if(s->flags & PARSER_FLAG_COMPLETE_FRAMES)
+ {
+ next=buf_size;
+ }else{
+ next=qcelp_find_frame_end(pc, buf, buf_size);
+
+ if (ff_combine_frame(pc, next, &buf, &buf_size) < 0)
+ {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ return buf_size;
+ }
+ }
+
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+
+ return next;
+}
+
+AVCodecParser qcelp_parser = {
+ { CODEC_ID_QCELP },
+ sizeof(ParseContext),
+ NULL,
+ qcelp_parse,
+ ff_parse_close,
+};
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