diff options
| -rw-r--r-- | libavcodec/ac3dsp.c | 23 | ||||
| -rw-r--r-- | libavcodec/ac3dsp.h | 2 | ||||
| -rw-r--r-- | libavcodec/ac3enc.c | 21 |
3 files changed, 28 insertions, 18 deletions
diff --git a/libavcodec/ac3dsp.c b/libavcodec/ac3dsp.c index cd4d30b8f2..dccad3b3e8 100644 --- a/libavcodec/ac3dsp.c +++ b/libavcodec/ac3dsp.c @@ -19,6 +19,7 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#include "libavutil/avassert.h" #include "avcodec.h" #include "ac3.h" #include "ac3dsp.h" @@ -149,6 +150,27 @@ static int ac3_compute_mantissa_size_c(int mant_cnt[5], uint8_t *bap, 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) { 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->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_c; c->compute_mantissa_size = ac3_compute_mantissa_size_c; + c->extract_exponents = ac3_extract_exponents_c; if (ARCH_ARM) ff_ac3dsp_init_arm(c, bit_exact); diff --git a/libavcodec/ac3dsp.h b/libavcodec/ac3dsp.h index aa605a8b29..b750767e81 100644 --- a/libavcodec/ac3dsp.h +++ b/libavcodec/ac3dsp.h @@ -105,6 +105,8 @@ typedef struct AC3DSPContext { * 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); + + void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs); } AC3DSPContext; void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact); diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c index e0806b3081..04e8b4fb0b 100644 --- a/libavcodec/ac3enc.c +++ b/libavcodec/ac3enc.c @@ -562,28 +562,13 @@ static av_cold void exponent_init(AC3EncodeContext *s) */ static void extract_exponents(AC3EncodeContext *s) { - int blk, ch, i; + int blk, ch; for (ch = 0; ch < s->channels; ch++) { for (blk = 0; blk < AC3_MAX_BLOCKS; blk++) { AC3Block *block = &s->blocks[blk]; - uint8_t *exp = block->exp[ch]; - int32_t *coef = block->fixed_coef[ch]; - 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; - } + s->ac3dsp.extract_exponents(block->exp[ch], block->fixed_coef[ch], + AC3_MAX_COEFS); } } } |