ffmpeg/FFmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-09-20 13:26:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

ac3enc: merge log2_tab() into normalize_samples()

Browse Source
This commit is contained in:
Justin Ruggles 2011-06-27 07:46:27 -04:00
parent 7dcdf974d0
commit 668afae438
1 changed files with 2 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
libavcodec/ac3enc_fixed.c
View File

@ -71,19 +71,6 @@ void AC3_NAME(apply_window)(DSPContext *dsp, int16_t *output,
}
/**
* Calculate the log2() of the maximum absolute value in an array.
* @param tab input array
* @param n number of values in the array
* @return log2(max(abs(tab[])))
*/
static int log2_tab(AC3EncodeContext *s, int16_t *src, int len)
{
int v = s->ac3dsp.ac3_max_msb_abs_int16(src, len);
return av_log2(v);
}
/**
* Normalize the input samples to use the maximum available precision.
* This assumes signed 16-bit input samples.
@ -92,7 +79,8 @@ static int log2_tab(AC3EncodeContext *s, int16_t *src, int len)
*/
int AC3_NAME(normalize_samples)(AC3EncodeContext *s)
{
int v = 14 - log2_tab(s, s->windowed_samples, AC3_WINDOW_SIZE);
int v = s->ac3dsp.ac3_max_msb_abs_int16(s->windowed_samples, AC3_WINDOW_SIZE);
v = 14 - av_log2(v);
if (v > 0)
s->ac3dsp.ac3_lshift_int16(s->windowed_samples, AC3_WINDOW_SIZE, v);
/* +6 to right-shift from 31-bit to 25-bit */