mirror of https://github.com/mpv-player/mpv
47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
/*
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* Copyright (C) 2005 Nico Sabbi
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdint.h>
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#include "aac_hdr.h"
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/// \param srate (out) sample rate
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/// \param num (out) number of audio frames in this ADTS frame
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/// \return size of the ADTS frame in bytes
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/// aac_parse_frames needs a buffer at least 8 bytes long
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int aac_parse_frame(uint8_t *buf, int *srate, int *num)
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{
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int i = 0, sr, fl = 0, id;
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static int srates[] = {96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 0, 0, 0};
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if((buf[i] != 0xFF) || ((buf[i+1] & 0xF6) != 0xF0))
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return 0;
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id = (buf[i+1] >> 3) & 0x01; //id=1 mpeg2, 0: mpeg4
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sr = (buf[i+2] >> 2) & 0x0F;
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if(sr > 11)
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return 0;
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*srate = srates[sr];
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fl = ((buf[i+3] & 0x03) << 11) | (buf[i+4] << 3) | ((buf[i+5] >> 5) & 0x07);
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*num = (buf[i+6] & 0x02) + 1;
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return fl;
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}
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