2011-02-10 17:20:36 +00:00
|
|
|
/*
|
|
|
|
* AC-3 DSP utils
|
|
|
|
* Copyright (c) 2011 Justin Ruggles
|
|
|
|
*
|
|
|
|
* This file is part of FFmpeg.
|
|
|
|
*
|
|
|
|
* FFmpeg 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.
|
|
|
|
*
|
|
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "avcodec.h"
|
|
|
|
#include "ac3dsp.h"
|
|
|
|
|
|
|
|
static void ac3_exponent_min_c(uint8_t *exp, int num_reuse_blocks, int nb_coefs)
|
|
|
|
{
|
|
|
|
int blk, i;
|
|
|
|
|
|
|
|
if (!num_reuse_blocks)
|
|
|
|
return;
|
|
|
|
|
|
|
|
for (i = 0; i < nb_coefs; i++) {
|
|
|
|
uint8_t min_exp = *exp;
|
|
|
|
uint8_t *exp1 = exp + 256;
|
|
|
|
for (blk = 0; blk < num_reuse_blocks; blk++) {
|
|
|
|
uint8_t next_exp = *exp1;
|
|
|
|
if (next_exp < min_exp)
|
|
|
|
min_exp = next_exp;
|
|
|
|
exp1 += 256;
|
|
|
|
}
|
|
|
|
*exp++ = min_exp;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-02-13 19:49:50 +00:00
|
|
|
static int ac3_max_msb_abs_int16_c(const int16_t *src, int len)
|
|
|
|
{
|
|
|
|
int i, v = 0;
|
|
|
|
for (i = 0; i < len; i++)
|
|
|
|
v |= abs(src[i]);
|
|
|
|
return v;
|
|
|
|
}
|
|
|
|
|
2011-03-11 21:45:01 +00:00
|
|
|
static void ac3_lshift_int16_c(int16_t *src, unsigned int len,
|
|
|
|
unsigned int shift)
|
|
|
|
{
|
|
|
|
uint32_t *src32 = (uint32_t *)src;
|
|
|
|
const uint32_t mask = ~(((1 << shift) - 1) << 16);
|
|
|
|
int i;
|
|
|
|
len >>= 1;
|
|
|
|
for (i = 0; i < len; i += 8) {
|
|
|
|
src32[i ] = (src32[i ] << shift) & mask;
|
|
|
|
src32[i+1] = (src32[i+1] << shift) & mask;
|
|
|
|
src32[i+2] = (src32[i+2] << shift) & mask;
|
|
|
|
src32[i+3] = (src32[i+3] << shift) & mask;
|
|
|
|
src32[i+4] = (src32[i+4] << shift) & mask;
|
|
|
|
src32[i+5] = (src32[i+5] << shift) & mask;
|
|
|
|
src32[i+6] = (src32[i+6] << shift) & mask;
|
|
|
|
src32[i+7] = (src32[i+7] << shift) & mask;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void ac3_rshift_int32_c(int32_t *src, unsigned int len,
|
|
|
|
unsigned int shift)
|
|
|
|
{
|
|
|
|
do {
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
*src++ >>= shift;
|
|
|
|
len -= 8;
|
|
|
|
} while (len > 0);
|
|
|
|
}
|
|
|
|
|
2011-03-16 02:29:04 +00:00
|
|
|
static void float_to_fixed24_c(int32_t *dst, const float *src, unsigned int len)
|
|
|
|
{
|
|
|
|
const float scale = 1 << 24;
|
|
|
|
do {
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
*dst++ = lrintf(*src++ * scale);
|
|
|
|
len -= 8;
|
|
|
|
} while (len > 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
|
2011-02-10 17:20:36 +00:00
|
|
|
{
|
|
|
|
c->ac3_exponent_min = ac3_exponent_min_c;
|
2011-02-13 19:49:50 +00:00
|
|
|
c->ac3_max_msb_abs_int16 = ac3_max_msb_abs_int16_c;
|
2011-03-11 21:45:01 +00:00
|
|
|
c->ac3_lshift_int16 = ac3_lshift_int16_c;
|
|
|
|
c->ac3_rshift_int32 = ac3_rshift_int32_c;
|
2011-03-16 02:29:04 +00:00
|
|
|
c->float_to_fixed24 = float_to_fixed24_c;
|
2011-02-10 17:20:36 +00:00
|
|
|
|
|
|
|
if (HAVE_MMX)
|
2011-03-16 02:29:04 +00:00
|
|
|
ff_ac3dsp_init_x86(c, bit_exact);
|
2011-02-10 17:20:36 +00:00
|
|
|
}
|