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| author | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-12-15 23:44:54 -0500 |
|---|---|---|
| committer | Ganesh Ajjanagadde <gajjanagadde@gmail.com> | 2015-12-16 07:57:26 -0500 |
| commit | 83a04f103d387a8b7f574d97d340d90f42fc18de (patch) | |
| tree | 740d3c0f8089daa3a5742d0bd7020259e4a401ad | |
| parent | 4fa6f09c2c024cb6a9697d2d63b0be04a0630267 (diff) | |
| download | ffmpeg-83a04f103d387a8b7f574d97d340d90f42fc18de.tar.gz | |
lavc: move exp2fi to ff_exp2fi in internal.h
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
| -rw-r--r-- | libavcodec/internal.h | 19 | ||||
| -rw-r--r-- | libavcodec/jpeg2000.c | 18 |
2 files changed, 21 insertions, 16 deletions
diff --git a/libavcodec/internal.h b/libavcodec/internal.h index 445b45ad91..afcf00d013 100644 --- a/libavcodec/internal.h +++ b/libavcodec/internal.h @@ -242,6 +242,25 @@ static av_always_inline int64_t ff_samples_to_time_base(AVCodecContext *avctx, } /** + * 2^(x) for integer x + * @return correctly rounded float + */ +static av_always_inline float ff_exp2fi(int x) { + /* Normal range */ + if (-126 <= x && x <= 128) + return av_int2float(x+127 << 23); + /* Too large */ + else if (x > 128) + return INFINITY; + /* Subnormal numbers */ + else if (x > -150) + return av_int2float(1 << (x+149)); + /* Negligibly small */ + else + return 0; +} + +/** * Get a buffer for a frame. This is a wrapper around * AVCodecContext.get_buffer() and should be used instead calling get_buffer() * directly. diff --git a/libavcodec/jpeg2000.c b/libavcodec/jpeg2000.c index afd0966103..b5b2dbf220 100644 --- a/libavcodec/jpeg2000.c +++ b/libavcodec/jpeg2000.c @@ -31,6 +31,7 @@ #include "libavutil/imgutils.h" #include "libavutil/mem.h" #include "avcodec.h" +#include "internal.h" #include "jpeg2000.h" #define SHL(a, n) ((n) >= 0 ? (a) << (n) : (a) >> -(n)) @@ -192,21 +193,6 @@ void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y, // static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } }; (unused) -static inline float exp2fi(int x) { - /* Normal range */ - if (-126 <= x && x <= 128) - return av_int2float(x+127 << 23); - /* Too large */ - else if (x > 128) - return INFINITY; - /* Subnormal numbers */ - else if (x > -150) - return av_int2float(1 << (x+149)); - /* Negligibly small */ - else - return 0; -} - static void init_band_stepsize(AVCodecContext *avctx, Jpeg2000Band *band, Jpeg2000CodingStyle *codsty, @@ -236,7 +222,7 @@ static void init_band_stepsize(AVCodecContext *avctx, * R_b = R_I + log2 (gain_b ) * see ISO/IEC 15444-1:2002 E.1.1 eqn. E-3 and E-4 */ gain = cbps; - band->f_stepsize = exp2fi(gain - qntsty->expn[gbandno]); + band->f_stepsize = ff_exp2fi(gain - qntsty->expn[gbandno]); band->f_stepsize *= qntsty->mant[gbandno] / 2048.0 + 1.0; break; default: |