diff options
Diffstat (limited to 'ffmpeg/libavcodec/mpegaudio_tablegen.h')
| -rw-r--r-- | ffmpeg/libavcodec/mpegaudio_tablegen.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/ffmpeg/libavcodec/mpegaudio_tablegen.h b/ffmpeg/libavcodec/mpegaudio_tablegen.h index 6c15d3c..f9557c9 100644 --- a/ffmpeg/libavcodec/mpegaudio_tablegen.h +++ b/ffmpeg/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 * pow(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; @@ -59,8 +60,10 @@ 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; - expval_table_fixed[exponent][value] = llrint(f); + /* cbrtf() isn't available on all systems, so we use powf(). */ + double f = (double)value * pow(value, 1.0 / 3.0) * pow(2, (exponent - 400) * 0.25 + FRAC_BITS + 5) / IMDCT_SCALAR; + /* llrint() isn't always available, so round and cast manually. */ + expval_table_fixed[exponent][value] = (long long int) (f < 0xFFFFFFFF ? floor(f + 0.5) : 0xFFFFFFFF); expval_table_float[exponent][value] = f; } exp_table_fixed[exponent] = expval_table_fixed[exponent][1]; |