From 794ca87d2bff2513118de8b97595b3e23070e67d Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Tue, 28 May 2013 09:33:43 +0200 Subject: wvdec: split block header parsing into a separate file It will be reused by other muxers and demuxers. --- libavformat/wv.c | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 libavformat/wv.c (limited to 'libavformat/wv.c') 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 +#include + +#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; +} -- cgit v1.2.3