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-rw-r--r--media/ffvpx/libavcodec/xiph.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/xiph.c b/media/ffvpx/libavcodec/xiph.c
new file mode 100644
index 000000000..d072224b4
--- /dev/null
+++ b/media/ffvpx/libavcodec/xiph.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2007 The FFmpeg Project
+ *
+ * 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
+ */
+
+#include "libavutil/intreadwrite.h"
+#include "xiph.h"
+
+int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size,
+ int first_header_size, const uint8_t *header_start[3],
+ int header_len[3])
+{
+ int i;
+
+ if (extradata_size >= 6 && AV_RB16(extradata) == first_header_size) {
+ int overall_len = 6;
+ for (i=0; i<3; i++) {
+ header_len[i] = AV_RB16(extradata);
+ extradata += 2;
+ header_start[i] = extradata;
+ extradata += header_len[i];
+ if (overall_len > extradata_size - header_len[i])
+ return -1;
+ overall_len += header_len[i];
+ }
+ } else if (extradata_size >= 3 && extradata_size < INT_MAX - 0x1ff && extradata[0] == 2) {
+ int overall_len = 3;
+ extradata++;
+ for (i=0; i<2; i++, extradata++) {
+ header_len[i] = 0;
+ for (; overall_len < extradata_size && *extradata==0xff; extradata++) {
+ header_len[i] += 0xff;
+ overall_len += 0xff + 1;
+ }
+ header_len[i] += *extradata;
+ overall_len += *extradata;
+ if (overall_len > extradata_size)
+ return -1;
+ }
+ header_len[2] = extradata_size - overall_len;
+ header_start[0] = extradata;
+ header_start[1] = header_start[0] + header_len[0];
+ header_start[2] = header_start[1] + header_len[1];
+ } else {
+ return -1;
+ }
+ return 0;
+}