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| author | Derek Buitenhuis <derek.buitenhuis@gmail.com> | 2013-01-15 16:28:03 -0500 |
|---|---|---|
| committer | Derek Buitenhuis <derek.buitenhuis@gmail.com> | 2013-10-15 16:52:07 +0100 |
| commit | 008014b5e72442fe7c8bf4a31e6bb74469b81359 (patch) | |
| tree | 31f96fd701ed2e92a97f2e680b7b8611ebcd4965 /libavcodec/mpegaudio_tablegen.h | |
| parent | 00aa24ffee91d52488765088ea0f60748e2a2083 (diff) | |
| download | ffmpeg-008014b5e72442fe7c8bf4a31e6bb74469b81359.tar.gz | |
tablegen: Don't use cbrtf in host tools
You cannot count on them being present on all systems, and you
cannot include libm.h in a host tool, so just hard code baseline
implementations.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Diffstat (limited to 'libavcodec/mpegaudio_tablegen.h')
| -rw-r--r-- | libavcodec/mpegaudio_tablegen.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/libavcodec/mpegaudio_tablegen.h b/libavcodec/mpegaudio_tablegen.h index 6c15d3cb03..1090ea5f1f 100644 --- a/libavcodec/mpegaudio_tablegen.h +++ b/libavcodec/mpegaudio_tablegen.h @@ -48,7 +48,8 @@ static void mpegaudio_tableinit(void) double value = i / 4; double f, fm; int e, m; - f = value / IMDCT_SCALAR * cbrtf(value) * pow(2, (i & 3) * 0.25); + /* cbrtf() isn't available on all systems, so we use powf(). */ + f = value / IMDCT_SCALAR * powf(value, 1.0 / 3.0) * pow(2, (i & 3) * 0.25); fm = frexp(f, &e); m = (uint32_t)(fm * (1LL << 31) + 0.5); e += FRAC_BITS - 31 + 5 - 100; @@ -59,7 +60,8 @@ static void mpegaudio_tableinit(void) } for (exponent = 0; exponent < 512; exponent++) { for (value = 0; value < 16; value++) { - double f = (double)value * cbrtf(value) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR; + /* cbrtf() isn't available on all systems, so we use powf(). */ + double f = (double)value * powf(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR; expval_table_fixed[exponent][value] = llrint(f); expval_table_float[exponent][value] = f; } |