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Audio level feedback

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This commit is contained in:
Ali
2020-07-06 01:19:30 +04:00
parent 52aa4f5619
commit 3e25bb7bf5
9 changed files with 177 additions and 14 deletions
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32
submodules/MediaPlayer/Sources/MediaPlayerAudioRenderer.swift
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@@ -15,6 +15,9 @@ private final class AudioPlayerRendererBufferContext {
var state: AudioPlayerRendererState = .paused
let timebase: CMTimebase
let buffer: RingByteBuffer
var audioLevelPeak: Int16 = 0
var audioLevelPeakCount: Int = 0
var audioLevelPeakUpdate: Double = 0.0
var bufferMaxChannelSampleIndex: Int64 = 0
var lowWaterSize: Int
var notifyLowWater: () -> Void
@@ -113,7 +116,6 @@ private func rendererInputProc(refCon: UnsafeMutableRawPointer, ioActionFlags: U
}
let rendererBuffer = context.buffer
var updatedLevel = false
while rendererFillOffset.0 < bufferList.count {
if let bufferData = bufferList[rendererFillOffset.0].mData {
@@ -128,11 +130,31 @@ private func rendererInputProc(refCon: UnsafeMutableRawPointer, ioActionFlags: U
let consumeCount = bufferDataSize - dataOffset
let actualConsumedCount = rendererBuffer.dequeue(bufferData.advanced(by: dataOffset), count: consumeCount)
if !updatedLevel && actualConsumedCount > 0 {
updatedLevel = true
let value = bufferData.advanced(by: dataOffset).assumingMemoryBound(to: UInt16.self).pointee
context.updatedLevel(Float(value) / Float(UInt16.max))
var samplePtr = bufferData.advanced(by: dataOffset).assumingMemoryBound(to: Int16.self)
for _ in 0 ..< actualConsumedCount / 4 {
let sample: Int16 = abs(samplePtr.pointee)
samplePtr = samplePtr.advanced(by: 2)
if context.audioLevelPeak < sample {
context.audioLevelPeak = sample
}
context.audioLevelPeakCount += 1
if context.audioLevelPeakCount >= 1200 {
let level = Float(context.audioLevelPeak) / (4000.0)
/*let timestamp = CFAbsoluteTimeGetCurrent()
if !context.audioLevelPeakUpdate.isZero {
let delta = timestamp - context.audioLevelPeakUpdate
print("level = \(level), delta = \(delta)")
}
context.audioLevelPeakUpdate = timestamp*/
context.updatedLevel(level)
context.audioLevelPeak = 0
context.audioLevelPeakCount = 0
}
}
rendererFillOffset.1 += actualConsumedCount
if actualConsumedCount == 0 {