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[MGCB] Write averageBytesPerSecond and blockAlign for SoundEffect #4254

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Dec 14, 2015
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[MGCB] Write averageBytesPerSecond and blockAlign for SoundEffect #4254

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24 changes: 19 additions & 5 deletions MonoGame.Framework.Content.Pipeline/Audio/AudioContent.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -260,14 +260,28 @@ public void ConvertFormat(ConversionFormat formatType, ConversionQuality quality
case "streams.stream.0.channels":
channelCount = int.Parse(kv[1].Trim('"'), numberFormat);
break;
case "streams.stream.0.bit_rate":
averageBytesPerSecond = (int.Parse(kv[1].Trim('"'), numberFormat) / 8);
break;
}
}

// This information is not available from ffprobe (and may or may not
// be relevant for non-PCM formats anyway):
//
// * averageBytesPerSecond
// * blockAlign
// Calculate blockAlign.
switch (formatType)
{
case ConversionFormat.Pcm:
// Block alignment value is the number of bytes in an atomic unit (that is, a block) of audio for a particular format. For Pulse Code Modulation (PCM) formats, the formula for calculating block alignment is as follows:
// • Block Alignment = Bytes per Sample x Number of Channels
// For example, the block alignment value for 16-bit PCM format mono audio is 2 (2 bytes per sample x 1 channel). For 16-bit PCM format stereo audio, the block alignment value is 4.
// https://msdn.microsoft.com/en-us/library/system.speech.audioformat.speechaudioformatinfo.blockalign(v=vs.110).aspx
blockAlign = (bitsPerSample / 8) * channelCount;
break;
default:
// blockAlign is not available from ffprobe (and may or may not
// be relevant for non-PCM formats anyway)
break;
}


this.duration = TimeSpan.FromSeconds(durationInSeconds);
this.format = new AudioFormat(
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