public void TC03_VBRPreset()
{
// Presets to test, should result in different sizes for all cases
var presets = new[] { LAMEPreset.STANDARD, LAMEPreset.EXTREME, LAMEPreset.ABR_160, LAMEPreset.V1, LAMEPreset.V4, LAMEPreset.V6, LAMEPreset.V9 };
var results = new Dictionary <LAMEPreset, long>();
foreach (var preset in presets)
{
var config = new LameConfig {
Preset = preset
};
if (preset == LAMEPreset.STANDARD)
{
config.BitRate = 128;
}
using (var mp3data = EncodeSampleFile(config))
{
results[preset] = mp3data.Length;
}
}
// Compare encoded sizes for all combinations of presets
for (int i = 0; i < presets.Length - 2; i++)
{
var left = results[presets[i]];
for (int j = i + 1; j < presets.Length; j++)
{
var right = results[presets[j]];
Assert.AreNotEqual(left, right, $"{presets[i]} size matched {presets[j]}");
}
}
}
private static Stream EncodeSilence(LameConfig config, WaveFormat format, int seconds = 1)
{
var mp3data = new MemoryStream();
using (var mp3writer = new LameMP3FileWriter(mp3data, format, config))
{
var bfr = new byte[format.AverageBytesPerSecond * seconds];
mp3writer.Write(bfr, 0, bfr.Length);
}
mp3data.Position = 0;
return(mp3data);
}
public MP3(string inputPath, string outputPath, Bitrates bitrate = Bitrates._320, MPEGMode mPEGMode = MPEGMode.JointStereo, IProgress <EncodeProgress> progress = null)
{
this.Bitrate = bitrate;
this.InputPath = inputPath;
this.OutputPath = outputPath;
this.InternalProgress = progress;
LConfig = new LameConfig()
{
BitRate = Convert.ToInt32(this.Bitrate.GetEnumDescription()),
Analysis = true,
Mode = mPEGMode
};
}
public void TC03_VBRPreset()
{
// Presets to test, should result in different sizes for all cases
var presets = new[] { LAMEPreset.STANDARD, LAMEPreset.EXTREME, LAMEPreset.ABR_160, LAMEPreset.V1, LAMEPreset.V4, LAMEPreset.V6, LAMEPreset.V9 };
var results = new Dictionary <LAMEPreset, long>();
WaveFormat sourceFormat;
using (var srcms = new MemoryStream())
{
using (var source = new AudioFileReader(SourceFilename))
{
sourceFormat = source.WaveFormat;
source.CopyTo(srcms);
}
foreach (var preset in presets)
{
var config = new LameConfig {
Preset = preset
};
if (preset == LAMEPreset.STANDARD)
{
config.BitRate = 128;
}
using (var mp3data = new MemoryStream())
{
using (var mp3writer = new LameMP3FileWriter(mp3data, sourceFormat, preset))
{
srcms.Position = 0;
srcms.CopyTo(mp3writer);
}
results[preset] = mp3data.Length;
}
}
}
// Compare encoded sizes for all combinations of presets
for (int i = 0; i < presets.Length - 2; i++)
{
var left = results[presets[i]];
for (int j = i + 1; j < presets.Length; j++)
{
var right = results[presets[j]];
Assert.AreNotEqual(left, right, $"{presets[i]} size matched {presets[j]}");
}
}
}
private static Stream EncodeSampleFile(LameConfig config, int copies = 1)
{
var mp3data = new MemoryStream();
using (var source = new AudioFileReader(SourceFilename))
using (var mp3writer = new LameMP3FileWriter(mp3data, source.WaveFormat, config))
{
for (int i = 0; i < copies; i++)
{
source.Position = 0;
source.CopyTo(mp3writer);
}
}
mp3data.Position = 0;
return(mp3data);
}
private static void ConvertBytesToMp3_Windows(byte[] wavBytes, string destinationFilePath)
{
// Larry Hayashi's recommended lame settings
// "lame.exe" -V 8 -b 16 -F -B -a -m m -q 1
// -a (downmix) not supported by NAudio.Lame yet
// -b 16 (minimum bitrate) not supported by NAudio.Lame yet
// -q 1 (algorithm quality) not supported by NAudio.Lame yet
// -B (maximum bitrate) not supported by NAudio.Lame and should have an arg
// -F (strictly enforce minimum bitrate) not supported by NAudio.Lame
var lameConfig = new LameConfig
{
Preset = LAMEPreset.V8, // -V 8
Mode = MPEGMode.Mono, // -m m
//MinimumBitRate = 16,
//MaximumBitRate = 128,
//ForceMinimum = true,
//VBRAlgorithmQuality = 1
};
try
{
using (var outputStream = new MemoryStream())
using (var inputStream = new MemoryStream(wavBytes))
using (var fileReader = new WaveFileReader(inputStream))
using (var fileWriter = new LameMP3FileWriter(outputStream, fileReader.WaveFormat, lameConfig))
{
fileWriter.OnProgress += (writer, bytes, outputBytes, finished) =>
{
if (finished)
{
var mp3Bytes = outputStream.ToArray();
SaveBytes(destinationFilePath, mp3Bytes);
}
};
fileReader.CopyTo(fileWriter);
fileWriter.Flush();
}
}
catch (ArgumentException e)
{
MessageBoxUtils.Show(null, string.Format(FwUtilsStrings.ConvertBytesToMp3_BadWavFile,
Path.GetFileName(destinationFilePath),
Environment.NewLine,
e.Message), string.Empty, MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
