WaveFormView

WaveFormView provides a view to display audio waveforms.

Generating waveforms at runtime, you don't have to prepare data in advance.

Note : It takes a few seconds to generate

Screenshots

Importing the Library

Add the following dependicity to your build.gradle file.

dependencies {
    repositories {
        jcenter()
    }
    compile 'space.siy:waveformview:1.0.0'
}

Usage

You can see full code at MainActivity.kt

//Open From Assets Folder
val afd = assets.openFd("jazz_in_paris.mp3")

//Build WaveFormData
WaveFormData.Factory(afd.fileDescriptor, afd.startOffset, afd.length)
        .build(object : WaveFormData.Factory.Callback {
            //When Complete, you can receive data and set to the view
            override fun onComplete(waveFormData: WaveFormData) {
                waveFormView.data = waveFormData

                //Initialize MediaPlayer
                val player = MediaPlayer()
                player.setDataSource(afd.fileDescriptor, afd.startOffset, afd.length)
                player.prepare()
                player.start()

                //Synchronize with MediaPlayer using WaveFormView.Callback
                waveFormView.callback = object : WaveFormView.Callback {
                    override fun onPlayPause() {
                        if (player.isPlaying)
                            player.pause()
                        else
                            player.start()
                    }
                    override fun onSeek(pos: Long) {
                        player.seekTo(pos.toInt())
                    }
                }

                //You have to notify current position to the view
                Handler().postDelayed(object : Runnable {
                    override fun run() {
                        waveFormView.position = player.currentPosition.toLong()
                        Handler().postDelayed(this, 20)
                    }
                }, 20)

            }

            override fun onProgress(progress: Float) {
                progressBar.progress = (progress*10).toInt()
            }
        })

Customization

You can change block style via xml and program.

The following xml shows all attributes.

<space.siy.waveformview.WaveFormView
        android:id="@+id/waveFormView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:blockColor="@color/white"
        app:blockColorPlayed="@color/red"
        app:showTimeText="true"
        app:textColor="@color/white"
        app:textBgColor="@color/black"
        app:blockWidth="10"
        app:topBlockScale="1"
        app:bottomBlockScale="0.5"
        app:peakMode="peakmode_average"
        app:secPerBlock="0.1" />

Document

See here.

Requirement

Supports Android 5.0+

WaveFormView uses MediaCodec supporting 5.0+ to generate waveform at runtime.

Lisence

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this work except in compliance with the License. You may obtain a copy of the License in the LICENSE file, or at:

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.