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5effc83479
FSF addresses used in PA sources are no longer valid and rpmlint generates numerous warnings during packaging because of this. This patch changes all FSF addresses to FSF web page according to the GPL how-to: https://www.gnu.org/licenses/gpl-howto.en.html Done automatically by sed-ing through sources.
84 lines
2.5 KiB
Text
84 lines
2.5 KiB
Text
# This file is part of PulseAudio.
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#
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# Copyright 2010 Lennart Poettering
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# Copyright 2010 Wim Taymans <wim.taymans@collabora.co.uk>
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# Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk>
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#
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# PulseAudio is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation; either version 2.1 of the License,
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# or (at your option) any later version.
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#
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# PulseAudio is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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# S16NE 1- and 2-channel volume scaling work as follows:
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#
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# params: samples s (signed 16-bit), volume v (signed 32-bit < 2^31)
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#
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# 32 16 0 (type of operation)
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# sample = | sample | (signed)
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# s = | 0 | sample | (unsigned)
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#
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# if (sample < 0)
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# signc = | 0 | 0xffff | (unsigned)
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# else
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# signc = | 0 | 0 | (unsigned)
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#
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# if (sample < 0)
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# ml = | 0 | -((s*vl) >> 16) | (unsigned)
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# else
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# ml = | 0 | (s*vl) >> 16 | (unsigned)
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#
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# vh = | v >> 16 | (signed, but sign bit is always zero
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# since PA_VOLUME_MAX is 0x0fffffff)
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# mh = | (s * vh) >> 16 | (signed)
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# ml = | ml + mh | (signed)
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# sample = | (ml >> 16) | (signed, saturated)
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.function pa_volume_s16ne_orc_1ch
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.dest 2 samples int16_t
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.param 4 vols int32_t
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.temp 4 v
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.temp 2 vh
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.temp 4 s
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.temp 4 mh
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.temp 4 ml
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.temp 4 signc
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loadpl v, vols
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convuwl s, samples
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x2 cmpgtsw signc, 0, s
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x2 andw signc, signc, v
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x2 mulhuw ml, s, v
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subl ml, ml, signc
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convhlw vh, v
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mulswl mh, samples, vh
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addl ml, ml, mh
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convssslw samples, ml
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.function pa_volume_s16ne_orc_2ch
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.dest 4 samples int16_t
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.longparam 8 vols
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.temp 8 v
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.temp 4 vh
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.temp 8 s
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.temp 8 mh
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.temp 8 ml
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.temp 8 signc
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loadpq v, vols
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x2 convuwl s, samples
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x4 cmpgtsw signc, 0, s
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x4 andw signc, signc, v
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x4 mulhuw ml, s, v
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x2 subl ml, ml, signc
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x2 convhlw vh, v
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x2 mulswl mh, samples, vh
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x2 addl ml, ml, mh
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x2 convssslw samples, ml
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