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author | albeu <albeu@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2008-04-09 00:43:19 +0000 |
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committer | albeu <albeu@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2008-04-09 00:43:19 +0000 |
commit | 0359e6ddfb15fe24a413fe6113eefd0cdb7bb7a3 (patch) | |
tree | 0eada30118675215ce2bf68101c6882ca07c960f /libmpdemux/aac_hdr.c | |
parent | f481e7870b0fcb7fec1614efab4fc7baf380bf1c (diff) | |
download | mpv-0359e6ddfb15fe24a413fe6113eefd0cdb7bb7a3.tar.bz2 mpv-0359e6ddfb15fe24a413fe6113eefd0cdb7bb7a3.tar.xz |
Split the aac header parsing out of aac demuxer to allow using libmpmux
without libmpdemux.
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@26359 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpdemux/aac_hdr.c')
-rw-r--r-- | libmpdemux/aac_hdr.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libmpdemux/aac_hdr.c b/libmpdemux/aac_hdr.c new file mode 100644 index 0000000000..b9ca15c748 --- /dev/null +++ b/libmpdemux/aac_hdr.c @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2005 Nico Sabbi + * + * This file is part of MPlayer. + * + * MPlayer is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * MPlayer 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with MPlayer; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <stdlib.h> +#include <inttypes.h> + +#include "config.h" + +/// \param srate (out) sample rate +/// \param num (out) number of audio frames in this ADTS frame +/// \return size of the ADTS frame in bytes +/// aac_parse_frames needs a buffer at least 8 bytes long +int aac_parse_frame(uint8_t *buf, int *srate, int *num) +{ + int i = 0, sr, fl = 0, id; + static int srates[] = {96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 0, 0, 0}; + + if((buf[i] != 0xFF) || ((buf[i+1] & 0xF6) != 0xF0)) + return 0; + + id = (buf[i+1] >> 3) & 0x01; //id=1 mpeg2, 0: mpeg4 + sr = (buf[i+2] >> 2) & 0x0F; + if(sr > 11) + return 0; + *srate = srates[sr]; + + fl = ((buf[i+3] & 0x03) << 11) | (buf[i+4] << 3) | ((buf[i+5] >> 5) & 0x07); + *num = (buf[i+6] & 0x02) + 1; + + return fl; +} |