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replaygain_synthesis.c : Replace an int64_t/int32_t operation with a shift.

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Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo 2014-05-18 13:40:15 +10:00
parent 0da01cb255
commit 2be824a1e3
1 changed files with 2 additions and 37 deletions
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39
src/share/replaygain_synthesis/replaygain_synthesis.c
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@ -294,41 +294,6 @@ static FLAC__int64 dither_output_(DitherContext *d, FLAC__bool do_dithering, int
size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool little_endian_data_out, FLAC__bool unsigned_data_out, const FLAC__int32 * const input[], unsigned wide_samples, unsigned channels, const unsigned source_bps, const unsigned target_bps, const double scale, const FLAC__bool hard_limit, FLAC__bool do_dithering, DitherContext *dither_context)
{
static const FLAC__int32 conv_factors_[33] = {
-1, /* 0 bits-per-sample (not supported) */
-1, /* 1 bits-per-sample (not supported) */
-1, /* 2 bits-per-sample (not supported) */
-1, /* 3 bits-per-sample (not supported) */
268435456, /* 4 bits-per-sample */
134217728, /* 5 bits-per-sample */
67108864, /* 6 bits-per-sample */
33554432, /* 7 bits-per-sample */
16777216, /* 8 bits-per-sample */
8388608, /* 9 bits-per-sample */
4194304, /* 10 bits-per-sample */
2097152, /* 11 bits-per-sample */
1048576, /* 12 bits-per-sample */
524288, /* 13 bits-per-sample */
262144, /* 14 bits-per-sample */
131072, /* 15 bits-per-sample */
65536, /* 16 bits-per-sample */
32768, /* 17 bits-per-sample */
16384, /* 18 bits-per-sample */
8192, /* 19 bits-per-sample */
4096, /* 20 bits-per-sample */
2048, /* 21 bits-per-sample */
1024, /* 22 bits-per-sample */
512, /* 23 bits-per-sample */
256, /* 24 bits-per-sample */
128, /* 25 bits-per-sample */
64, /* 26 bits-per-sample */
32, /* 27 bits-per-sample */
16, /* 28 bits-per-sample */
8, /* 29 bits-per-sample */
4, /* 30 bits-per-sample */
2, /* 31 bits-per-sample */
1 /* 32 bits-per-sample */
};
static const FLAC__int64 hard_clip_factors_[33] = {
0, /* 0 bits-per-sample (not supported) */
0, /* 1 bits-per-sample (not supported) */
@ -364,7 +329,7 @@ size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool l
-1073741824, /* 31 bits-per-sample */
(FLAC__int64)(-1073741824) * 2 /* 32 bits-per-sample */
};
const FLAC__int32 conv_factor = conv_factors_[target_bps];
const FLAC__int32 conv_shift = 32 - target_bps;
const FLAC__int64 hard_clip_factor = hard_clip_factors_[target_bps];
/*
* The integer input coming in has a varying range based on the
@ -409,7 +374,7 @@ size_t FLAC__replaygain_synthesis__apply_gain(FLAC__byte *data_out, FLAC__bool l
}
sample *= 2147483647.;
val64 = dither_output_(dither_context, do_dithering, noise_shaping, (i + last_history_index) % 32, sample, channel) / conv_factor;
val64 = dither_output_(dither_context, do_dithering, noise_shaping, (i + last_history_index) % 32, sample, channel) >> conv_shift;
val32 = (FLAC__int32)val64;
if(val64 >= -hard_clip_factor)