wvdec: split block header parsing into a separate file

It will be reused by other muxers and demuxers.

1 files changed, 56 insertions, 0 deletions

diff --git a/libavformat/wv.h b/libavformat/wv.h
new file mode 100644
index 0000000000..ef285d2ebc
--- /dev/null
+++ b/libavformat/wv.h
@@ -0,0 +1,56 @@
+/*
+ * 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
+ */
+
+#ifndef AVFORMAT_WV_H
+#define AVFORMAT_WV_H
+
+#include <stdint.h>
+
+#define WV_HEADER_SIZE 32
+
+#define WV_FLAG_INITIAL_BLOCK (1 << 11)
+#define WV_FLAG_FINAL_BLOCK   (1 << 12)
+
+// specs say that maximum block size is 1Mb
+#define WV_BLOCK_LIMIT 1048576
+
+typedef struct WvHeader {
+    uint32_t blocksize;     //< size of the block data (excluding the header)
+    uint16_t version;       //< bitstream version
+    uint32_t total_samples; //< total number of samples in the stream
+    uint32_t block_idx;     //< index of the first sample in this block
+    uint32_t samples;       //< number of samples in this block
+    uint32_t flags;
+    uint32_t crc;
+
+    int initial, final;
+} WvHeader;
+
+/**
+ * Parse a WavPack block header.
+ *
+ * @param wv   this struct will be filled with parse header information
+ * @param data header data, must be WV_HEADER_SIZE bytes long
+ *
+ * @return 0 on success, a negative AVERROR code on failure
+ */
+int ff_wv_parse_header(WvHeader *wv, const uint8_t *data);
+
+#endif /* AVFORMAT_WV_H */