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[MSC3246](https://github.com/matrix-org/matrix-spec-proposals/pull/3246) specifies the waveform as a list of ints because: > Because floating point numbers are not allowed in Matrix events Though DSP on audio data is almost always done using their floating point representation. This PR brings the float<->int rescaling in the `matrix` module so that the application code can always work with float waveform samples.pull/1664/head
Marco Romano
11 months ago
committed by
GitHub
10 changed files with 28 additions and 41 deletions
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/* |
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* Copyright (c) 2023 New Vector Ltd |
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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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*/ |
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package io.element.android.features.messages.impl.voicemessages |
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/** |
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* Resizes the given [0;1024] int list as per unstable MSC3246 spec |
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* to a [0;1] range float list to be used for waveform rendering. |
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*/ |
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internal fun List<Int>.fromMSC3246range(): List<Float> = map { it / 1024f } |
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/** |
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* Resizes the given [0;1] float list to [0;1024] int list as per unstable MSC3246 spec. |
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*/ |
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internal fun List<Float>.toMSC3246range(): List<Int> = map { (it * 1024).toInt() } |
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