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Diffstat (limited to 'src/pulsecore/svolume.orc')
| -rw-r--r-- | src/pulsecore/svolume.orc | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/pulsecore/svolume.orc b/src/pulsecore/svolume.orc new file mode 100644 index 0000000..26f618e --- /dev/null +++ b/src/pulsecore/svolume.orc @@ -0,0 +1,84 @@ +# This file is part of PulseAudio. +# +# Copyright 2010 Lennart Poettering +# Copyright 2010 Wim Taymans <wim.taymans@collabora.co.uk> +# Copyright 2010 Arun Raghavan <arun.raghavan@collabora.co.uk> +# +# PulseAudio is free software; you can redistribute it and/or modify +# it under the terms of the GNU Lesser General Public License as published +# by the Free Software Foundation; either version 2.1 of the License, +# or (at your option) any later version. +# +# PulseAudio is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. + +# S16NE 1- and 2-channel volume scaling work as follows: +# +# params: samples s (signed 16-bit), volume v (signed 32-bit < 2^31) +# +# 32 16 0 (type of operation) +# sample = | sample | (signed) +# s = | 0 | sample | (unsigned) +# +# if (sample < 0) +# signc = | 0 | 0xffff | (unsigned) +# else +# signc = | 0 | 0 | (unsigned) +# +# if (sample < 0) +# ml = | 0 | -((s*vl) >> 16) | (unsigned) +# else +# ml = | 0 | (s*vl) >> 16 | (unsigned) +# +# vh = | v >> 16 | (signed, but sign bit is always zero +# since PA_VOLUME_MAX is 0x0fffffff) +# mh = | (s * vh) >> 16 | (signed) +# ml = | ml + mh | (signed) +# sample = | (ml >> 16) | (signed, saturated) + +.function pa_volume_s16ne_orc_1ch +.dest 2 samples int16_t +.param 4 vols int32_t +.temp 4 v +.temp 2 vh +.temp 4 s +.temp 4 mh +.temp 4 ml +.temp 4 signc + +loadpl v, vols +convuwl s, samples +x2 cmpgtsw signc, 0, s +x2 andw signc, signc, v +x2 mulhuw ml, s, v +subl ml, ml, signc +convhlw vh, v +mulswl mh, samples, vh +addl ml, ml, mh +convssslw samples, ml + +.function pa_volume_s16ne_orc_2ch +.dest 4 samples int16_t +.longparam 8 vols +.temp 8 v +.temp 4 vh +.temp 8 s +.temp 8 mh +.temp 8 ml +.temp 8 signc + +loadpq v, vols +x2 convuwl s, samples +x4 cmpgtsw signc, 0, s +x4 andw signc, signc, v +x4 mulhuw ml, s, v +x2 subl ml, ml, signc +x2 convhlw vh, v +x2 mulswl mh, samples, vh +x2 addl ml, ml, mh +x2 convssslw samples, ml |