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ac3enc: move extract_exponents inner loop to ac3dsp

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-03-12 22:16:49 +00:00
parent 727c7aa026
commit 2310ee4b1c
3 changed files with 28 additions and 18 deletions
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23
libavcodec/ac3dsp.c
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@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/ */
#include "libavutil/avassert.h"
#include "avcodec.h" #include "avcodec.h"
#include "ac3.h" #include "ac3.h"
#include "ac3dsp.h" #include "ac3dsp.h"
@ -149,6 +150,27 @@ static int ac3_compute_mantissa_size_c(int mant_cnt[5], uint8_t *bap,
return bits; return bits;
} }
static void ac3_extract_exponents_c(uint8_t *exp, int32_t *coef, int nb_coefs)
{
int i;
for (i = 0; i < nb_coefs; i++) {
int e;
int v = abs(coef[i]);
if (v == 0)
e = 24;
else {
e = 23 - av_log2(v);
if (e >= 24) {
e = 24;
coef[i] = 0;
}
av_assert2(e >= 0);
}
exp[i] = e;
}
}
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact) av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
{ {
c->ac3_exponent_min = ac3_exponent_min_c; c->ac3_exponent_min = ac3_exponent_min_c;
@ -158,6 +180,7 @@ av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
c->float_to_fixed24 = float_to_fixed24_c; c->float_to_fixed24 = float_to_fixed24_c;
c->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_c; c->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_c;
c->compute_mantissa_size = ac3_compute_mantissa_size_c; c->compute_mantissa_size = ac3_compute_mantissa_size_c;
c->extract_exponents = ac3_extract_exponents_c;
if (ARCH_ARM) if (ARCH_ARM)
ff_ac3dsp_init_arm(c, bit_exact); ff_ac3dsp_init_arm(c, bit_exact);

2
libavcodec/ac3dsp.h
View File

@ -105,6 +105,8 @@ typedef struct AC3DSPContext {
* Calculate the number of bits needed to encode a set of mantissas. * Calculate the number of bits needed to encode a set of mantissas.
*/ */
int (*compute_mantissa_size)(int mant_cnt[5], uint8_t *bap, int nb_coefs); int (*compute_mantissa_size)(int mant_cnt[5], uint8_t *bap, int nb_coefs);
void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs);
} AC3DSPContext; } AC3DSPContext;
void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact); void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact);

21
libavcodec/ac3enc.c
View File

@ -562,28 +562,13 @@ static av_cold void exponent_init(AC3EncodeContext *s)
*/ */
static void extract_exponents(AC3EncodeContext *s) static void extract_exponents(AC3EncodeContext *s)
{ {
int blk, ch, i; int blk, ch;
for (ch = 0; ch < s->channels; ch++) { for (ch = 0; ch < s->channels; ch++) {
for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) {
AC3Block *block = &s->blocks[blk]; AC3Block *block = &s->blocks[blk];
uint8_t *exp = block->exp[ch]; s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch],
int32_t *coef = block->fixed_coef[ch]; AC3_MAX_COEFS);
for (i = 0; i < AC3_MAX_COEFS; i++) {
int e;
int v = abs(coef[i]);
if (v == 0)
e = 24;
else {
e = 23 - av_log2(v);
if (e >= 24) {
e = 24;
coef[i] = 0;
}
av_assert2(e >= 0);
}
exp[i] = e;
}
} }
} }
} }