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ac3enc: move compute_mantissa_size() to ac3dsp

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Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-03-11 17:16:27 +00:00
parent 6f718471ea
commit 52fd16a264
3 changed files with 29 additions and 26 deletions
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23
libavcodec/ac3dsp.c
View File

@ -127,6 +127,28 @@ static void ac3_bit_alloc_calc_bap_c(int16_t *mask, int16_t *psd,
} while (end > ff_ac3_band_start_tab[band++]);
}
static int ac3_compute_mantissa_size_c(int mant_cnt[5], uint8_t *bap,
int nb_coefs)
{
int bits, b, i;
bits = 0;
for (i = 0; i < nb_coefs; i++) {
b = bap[i];
if (b <= 4) {
// bap=1 to bap=4 will be counted in compute_mantissa_size_final
mant_cnt[b]++;
} else if (b <= 13) {
// bap=5 to bap=13 use (bap-1) bits
bits += b - 1;
} else {
// bap=14 uses 14 bits and bap=15 uses 16 bits
bits += (b == 14) ? 14 : 16;
}
}
return bits;
}
av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
{
c->ac3_exponent_min = ac3_exponent_min_c;
@ -135,6 +157,7 @@ av_cold void ff_ac3dsp_init(AC3DSPContext *c, int bit_exact)
c->ac3_rshift_int32 = ac3_rshift_int32_c;
c->float_to_fixed24 = float_to_fixed24_c;
c->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_c;
c->compute_mantissa_size = ac3_compute_mantissa_size_c;
if (ARCH_ARM)
ff_ac3dsp_init_arm(c, bit_exact);

5
libavcodec/ac3dsp.h
View File

@ -100,6 +100,11 @@ typedef struct AC3DSPContext {
void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end,
int snr_offset, int floor,
const uint8_t *bap_tab, uint8_t *bap);
/**
* 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);
} AC3DSPContext;
void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact);

27
libavcodec/ac3enc.c
View File

@ -927,31 +927,6 @@ static void count_frame_bits(AC3EncodeContext *s)
}
/**
* Calculate the number of bits needed to encode a set of mantissas.
*/
static int compute_mantissa_size(int mant_cnt[5], uint8_t *bap, int nb_coefs)
{
int bits, b, i;
bits = 0;
for (i = 0; i < nb_coefs; i++) {
b = bap[i];
if (b <= 4) {
// bap=1 to bap=4 will be counted in compute_mantissa_size_final
mant_cnt[b]++;
} else if (b <= 13) {
// bap=5 to bap=13 use (bap-1) bits
bits += b - 1;
} else {
// bap=14 uses 14 bits and bap=15 uses 16 bits
bits += (b == 14) ? 14 : 16;
}
}
return bits;
}
/**
* Finalize the mantissa bit count by adding in the grouped mantissas.
*/
@ -1052,7 +1027,7 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
s->bit_alloc.floor, ff_ac3_bap_tab,
block->bap[ch]);
}
mantissa_bits += compute_mantissa_size(mant_cnt, block->bap[ch], s->nb_coefs[ch]);
mantissa_bits += s->ac3dsp.compute_mantissa_size(mant_cnt, block->bap[ch], s->nb_coefs[ch]);
}
mantissa_bits += compute_mantissa_size_final(mant_cnt);
}