wvdec: split block header parsing into a separate file

It will be reused by other muxers and demuxers.

1 files changed, 52 insertions, 0 deletions

diff --git a/libavformat/wv.c b/libavformat/wv.c
new file mode 100644
index 0000000000..724256b19c
--- /dev/null
+++ b/libavformat/wv.c
@@ -0,0 +1,52 @@
+/*
+ * WavPack shared functions
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <string.h>
+
+#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
+
+#include "wv.h"
+
+int ff_wv_parse_header(WvHeader *wv, const uint8_t *data)
+{
+    memset(wv, 0, sizeof(*wv));
+
+    if (AV_RL32(data) != MKTAG('w', 'v', 'p', 'k'))
+        return AVERROR_INVALIDDATA;
+
+    wv->blocksize     = AV_RL32(data + 4);
+    if (wv->blocksize < 24 || wv->blocksize > WV_BLOCK_LIMIT)
+        return AVERROR_INVALIDDATA;
+    wv->blocksize -= 24;
+
+    wv->version       = AV_RL16(data + 8);
+    wv->total_samples = AV_RL32(data + 12);
+    wv->block_idx     = AV_RL32(data + 16);
+    wv->samples       = AV_RL32(data + 20);
+    wv->flags         = AV_RL32(data + 24);
+    wv->crc           = AV_RL32(data + 28);
+
+    wv->initial = !!(wv->flags & WV_FLAG_INITIAL_BLOCK);
+    wv->final   = !!(wv->flags & WV_FLAG_FINAL_BLOCK);
+
+    return 0;
+}