mirror of
https://github.com/cookiengineer/audacity
synced 2025-11-04 08:04:06 +01:00
73 lines
2.3 KiB
C
73 lines
2.3 KiB
C
/*
|
|
* TwoLAME: an optimized MPEG Audio Layer Two encoder
|
|
*
|
|
* Copyright (C) 2001-2004 Michael Cheng
|
|
* Copyright (C) 2004-2006 The TwoLAME Project
|
|
*
|
|
* This library 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.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* $Id$
|
|
*
|
|
*/
|
|
|
|
|
|
/* write 1 bit from the bit stream */
|
|
static inline void buffer_put1bit(bit_stream * bs, int bit)
|
|
{
|
|
bs->totbit++;
|
|
|
|
bs->buf[bs->buf_byte_idx] |= (bit & 0x1) << (bs->buf_bit_idx - 1);
|
|
bs->buf_bit_idx--;
|
|
if (!bs->buf_bit_idx) {
|
|
bs->buf_bit_idx = 8;
|
|
bs->buf_byte_idx++;
|
|
if (bs->buf_byte_idx >= bs->buf_size) {
|
|
// empty_buffer (bs, minimum);
|
|
fprintf(stderr, "buffer_put1bit: error. bit_stream buffer needs to be bigger\n");
|
|
return;
|
|
}
|
|
bs->buf[bs->buf_byte_idx] = 0;
|
|
}
|
|
}
|
|
|
|
/* write N bits into the bit stream */
|
|
static inline void buffer_putbits(bit_stream * bs, unsigned int val, int N)
|
|
{
|
|
static const int putmask[9] = { 0x0, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff };
|
|
register int j = N;
|
|
register int k, tmp;
|
|
|
|
bs->totbit += N;
|
|
while (j > 0) {
|
|
k = MIN(j, bs->buf_bit_idx);
|
|
tmp = val >> (j - k);
|
|
bs->buf[bs->buf_byte_idx] |= (tmp & putmask[k]) << (bs->buf_bit_idx - k);
|
|
bs->buf_bit_idx -= k;
|
|
if (!bs->buf_bit_idx) {
|
|
bs->buf_bit_idx = 8;
|
|
bs->buf_byte_idx++;
|
|
if (bs->buf_byte_idx >= bs->buf_size) {
|
|
// empty_buffer (bs, minimum);
|
|
fprintf(stderr, "buffer_putbits: error. bit_stream buffer needs to be bigger\n");
|
|
return;
|
|
}
|
|
bs->buf[bs->buf_byte_idx] = 0;
|
|
}
|
|
j -= k;
|
|
}
|
|
}
|
|
|
|
// vim:ts=4:sw=4:nowrap:
|