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celp_math: rename ff_log2 to ff_log2_q15 

This name is more descriptive as the function returns a fixed-point
value with 15 fraction bits.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2012-10-18 17:59:13 +01:00
parent 79042ab376
commit f0c07be649
3 changed files with 3 additions and 3 deletions
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2
libavcodec/acelp_pitch_delay.c
View File

@ -86,7 +86,7 @@ void ff_acelp_update_past_gain(
if(erasure)
quant_energy[0] = FFMAX(avg_gain >> log2_ma_pred_order, -10240) - 4096; // -10 and -4 in (5.10)
else
quant_energy[0] = (6165 * ((ff_log2(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
quant_energy[0] = (6165 * ((ff_log2_q15(gain_corr_factor) >> 2) - (13 << 13))) >> 13;
}
int16_t ff_acelp_decode_gain_code(

2
libavcodec/celp_math.c
View File

@ -67,7 +67,7 @@ static const uint16_t tab_log2[33] =
26457, 27294, 28116, 28924, 29719, 30500, 31269, 32025, 32769,
};
int ff_log2(uint32_t value)
int ff_log2_q15(uint32_t value)
{
uint8_t power_int;
uint8_t frac_x0;

2
libavcodec/celp_math.h
View File

@ -40,7 +40,7 @@ int ff_exp2(uint16_t power);
*
* @return value of (1<<15) * log2(value)
*/
int ff_log2(uint32_t value);
int ff_log2_q15(uint32_t value);
/**
* Shift value left or right depending on sign of offset parameter.