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31 lines
1.2 KiB
31 lines
1.2 KiB
// Copyright 2020 Justine Alexandra Roberts Tunney
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Digital Signal Processing
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package dsp
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// Mixes together two audio frames containing 160 samples. Uses saturation
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// adding so you don't hear clipping if ppl talk loud. Uses 128-bit SIMD
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// instructions so we can add eight numbers at the same time.
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func L16MixSat160(dst, src *int16)
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// Compresses a PCM audio sample into a G.711 μ-Law sample. The BSR instruction
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// is what makes this code fast.
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//
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// TODO(jart): How do I make assembly use proper types?
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func LinearToUlaw(linear int64) (ulaw int64)
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// Turns a μ-Law byte back into an audio sample.
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func UlawToLinear(ulaw int64) (linear int64)
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