Centralize WaveForm samples.

features/messages/api/src/main/kotlin/io/element/android/features/messages/api/timeline/voicemessages/composer/VoiceMessageComposerStateProvider.kt

@@ -8,15 +8,15 @@
 package io.element.android.features.messages.api.timeline.voicemessages.composer
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.designsystem.components.media.createFakeWaveform
 import io.element.android.libraries.textcomposer.model.VoiceMessageState
-import kotlinx.collections.immutable.toImmutableList
 import kotlin.time.Duration.Companion.seconds
 
 open class VoiceMessageComposerStateProvider : PreviewParameterProvider<VoiceMessageComposerState> {
     override val values: Sequence<VoiceMessageComposerState>
         get() = sequenceOf(
-            aVoiceMessageComposerState(voiceMessageState = VoiceMessageState.Recording(duration = 61.seconds, levels = aWaveformLevels)),
+            aVoiceMessageComposerState(voiceMessageState = VoiceMessageState.Recording(duration = 61.seconds, levels = WaveFormSamples.allRangeWaveForm)),
         )
 }
 
@@ -41,5 +41,3 @@ fun aVoiceMessagePreviewState() = VoiceMessageState.Preview(
     time = 10.seconds,
     waveform = createFakeWaveform(),
 )
-
-internal var aWaveformLevels = List(100) { it.toFloat() / 100 }.toImmutableList()

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/media/WaveFormSamples.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.designsystem.components.media
+
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+
+object WaveFormSamples {
+    val allRangeWaveForm = List(100) { it.toFloat() / 100 }.toImmutableList()
+
+    val realisticWaveForm = persistentListOf(
+        0.000f, 0.000f, 0.000f, 0.003f, 0.354f,
+        0.353f, 0.365f, 0.790f, 0.787f, 0.167f,
+        0.333f, 0.975f, 0.000f, 0.102f, 0.003f,
+        0.531f, 0.584f, 0.317f, 0.140f, 0.475f,
+        0.496f, 0.561f, 0.042f, 0.263f, 0.169f,
+        0.829f, 0.349f, 0.010f, 0.000f, 0.000f,
+        1.000f, 0.334f, 0.321f, 0.011f, 0.000f,
+        0.000f, 0.003f,
+    )
+}

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/components/media/WaveformPlaybackView.kt

@@ -187,14 +187,14 @@ internal fun WaveformPlaybackViewPreview() = ElementPreview {
             showCursor = false,
             playbackProgress = 0.5f,
             onSeek = {},
-            waveform = aWaveForm().toImmutableList(),
+            waveform = WaveFormSamples.realisticWaveForm,
         )
         WaveformPlaybackView(
             modifier = Modifier.height(34.dp),
             showCursor = true,
             playbackProgress = 0.5f,
             onSeek = {},
-            waveform = List(1024) { it / 1024f }.toImmutableList(),
+            waveform = WaveFormSamples.allRangeWaveForm,
         )
     }
 }
@@ -217,45 +217,3 @@ private fun ImmutableList<Float>.normalisedData(maxSamplesCount: Int): Immutable
 
     return result.toImmutableList()
 }
-
-fun aWaveForm(): List<Float> {
-    return listOf(
-        0.000f,
-        0.000f,
-        0.000f,
-        0.003f,
-        0.354f,
-        0.353f,
-        0.365f,
-        0.790f,
-        0.787f,
-        0.167f,
-        0.333f,
-        0.975f,
-        0.000f,
-        0.102f,
-        0.003f,
-        0.531f,
-        0.584f,
-        0.317f,
-        0.140f,
-        0.475f,
-        0.496f,
-        0.561f,
-        0.042f,
-        0.263f,
-        0.169f,
-        0.829f,
-        0.349f,
-        0.010f,
-        0.000f,
-        0.000f,
-        1.000f,
-        0.334f,
-        0.321f,
-        0.011f,
-        0.000f,
-        0.000f,
-        0.003f,
-    )
-}

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/gallery/MediaGalleryStateProvider.kt

@@ -9,7 +9,7 @@ package io.element.android.libraries.mediaviewer.impl.gallery
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncData
-import io.element.android.libraries.designsystem.components.media.aWaveForm
+import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.mediaviewer.impl.details.MediaBottomSheetState
 import io.element.android.libraries.mediaviewer.impl.details.aMediaDetailsBottomSheetState
@@ -71,7 +71,7 @@ open class MediaGalleryStateProvider : PreviewParameterProvider<MediaGalleryStat
                             aMediaItemAudio(id = UniqueId("4")),
                             aMediaItemVoice(
                                 id = UniqueId("5"),
-                                waveform = aWaveForm(),
+                                waveform = WaveFormSamples.realisticWaveForm,
                             ),
                             aMediaItemLoadingIndicator(),
                         ).toImmutableList()

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/local/audio/MediaInfoAudioProvider.kt

@@ -8,7 +8,7 @@
 package io.element.android.libraries.mediaviewer.impl.local.audio
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
-import io.element.android.libraries.designsystem.components.media.aWaveForm
+import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.mediaviewer.api.MediaInfo
 import io.element.android.libraries.mediaviewer.api.anAudioMediaInfo
 
@@ -17,7 +17,7 @@ open class MediaInfoAudioProvider : PreviewParameterProvider<MediaInfo> {
         get() = sequenceOf(
             anAudioMediaInfo(),
             anAudioMediaInfo(
-                waveForm = aWaveForm(),
+                waveForm = WaveFormSamples.realisticWaveForm,
             ),
         )
 }

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/model/MediaItemFactories.kt

@@ -7,7 +7,7 @@
 
 package io.element.android.libraries.mediaviewer.impl.model
 
-import io.element.android.libraries.designsystem.components.media.aWaveForm
+import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.core.UniqueId
 import io.element.android.libraries.matrix.api.core.UserId
@@ -91,7 +91,7 @@ fun aMediaItemVoice(
     filename: String = "filename.ogg",
     caption: String? = null,
     duration: String? = "1:23",
-    waveform: List<Float> = aWaveForm(),
+    waveform: List<Float> = WaveFormSamples.realisticWaveForm,
 ): MediaItem.Voice {
     return MediaItem.Voice(
         id = id,

libraries/mediaviewer/impl/src/main/kotlin/io/element/android/libraries/mediaviewer/impl/viewer/MediaViewerStateProvider.kt

@@ -11,7 +11,7 @@ import android.net.Uri
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncData
-import io.element.android.libraries.designsystem.components.media.aWaveForm
+import io.element.android.libraries.designsystem.components.media.WaveFormSamples
 import io.element.android.libraries.matrix.api.core.EventId
 import io.element.android.libraries.matrix.api.media.MediaSource
 import io.element.android.libraries.matrix.api.timeline.Timeline
@@ -138,7 +138,7 @@ open class MediaViewerStateProvider : PreviewParameterProvider<MediaViewerState>
                 mediaBottomSheetState = aMediaDeleteConfirmationState(),
             ),
             anAudioMediaInfo(
-                waveForm = aWaveForm(),
+                waveForm = WaveFormSamples.realisticWaveForm,
             ).let {
                 aMediaViewerState(
                     listOf(