public LameEncConfig GetConfig(ref string summary)
{
LameEncConfig cfg = new LameEncConfig(this.WaveFormat, (uint)this.Bitrate);
cfg.format.nMode = (MpegMode)this.ChannelMode;
cfg.format.dwReSampleRate = (uint)this.ResampleFrequency;
cfg.format.bStrictIso = 1; // Audacity does the same
cfg.format.nPreset = LAME_QUALITY_PRESET.LQP_NOPRESET;
cfg.format.bWriteVBRHeader = cfg.format.bEnableVBR = 1;
cfg.format.dwBitrate = cfg.format.dwMaxBitrate = 0;
switch (BitrateMode)
{
case BitrateMode.CBR:
cfg.format.bWriteVBRHeader = cfg.format.bEnableVBR = 0;
cfg.format.dwBitrate = (uint)this.Bitrate;
cfg.format.nVbrMethod = VBRMETHOD.VBR_METHOD_NONE;
summary = Translator.Translate("TXT_CBR_SUMMARY", this.ChannelMode, this.Bitrate, this.ResampleFrequency);
break;
case BitrateMode.ABR:
// ABR == VBR bitrate-based
// Caution: LAME DLL calculates avg bitrate as (dwVbrAbr_bps + 500) / 1000
cfg.format.dwVbrAbr_bps = (uint)this.Bitrate * 1000 - 500;
cfg.format.nVBRQuality = 4; // Audacity does the same
cfg.format.nVbrMethod = VBRMETHOD.VBR_METHOD_ABR;
summary = Translator.Translate("TXT_ABR_SUMMARY", this.ChannelMode, this.Bitrate, this.ResampleFrequency);
break;
case BitrateMode.VBR:
// VBR quality-based
int q = 9 - this.VBRQuality;
cfg.format.nVBRQuality = (int)Math.Max(0, Math.Min(9, q));
cfg.format.nVbrMethod = VBRMETHOD.VBR_METHOD_NEW;
summary = Translator.Translate("TXT_VBR_SUMMARY", this.ChannelMode, cfg.format.nVBRQuality, this.ResampleFrequency);
break;
case BitrateMode.Preset:
// Preset mode is VBR or CBR/320 in case that VBRPreset == INSANE
cfg.format.nPreset = (LAME_QUALITY_PRESET)this.VBRPreset;
if (this.VBRPreset != Preset.Insane)
{
summary = Translator.Translate("TXT_PRESET_SUMMARY", this.ChannelMode, this.VBRPreset, this.ResampleFrequency);
}
else
{
summary = Translator.Translate("TXT_PRESET_INSANE", this.ChannelMode, this.VBRPreset, this.ResampleFrequency);
}
break;
}
return(cfg);
}
public void EncodeBuffer(byte[] buff, string destFile, bool generateTags, ID3FileInfoSlim ifiSlim)
{
string summary = "";
LameEncConfig cfg = this.Options.GetConfig(ref summary);
if (ifiSlim != null && ifiSlim.Frequency.HasValue)
{
cfg.format.dwSampleRate = (uint)ifiSlim.Frequency;
}
uint LameResult = Lame_encDll.Init(cfg, ref m_InputSamples, ref m_OutBufferSize, ref m_hLameStream);
if (LameResult != Lame_encDll.ERR_SUCCESSFUL)
{
throw new ApplicationException(string.Format("Lame_encDll.Init failed with the error code {0}", LameResult));
}
using (FileStream fs = new FileStream(destFile, FileMode.Create, FileAccess.Write, FileShare.None))
using (BinaryWriter bw = new BinaryWriter(fs))
{
uint EncodedSize = 0;
m_OutBuffer = new byte[m_OutBufferSize];
if (MustCancel())
{
return;
}
try
{
int buffPos = 0;
while (buffPos < buff.Length)
{
if (MustCancel())
{
return;
}
m_OutBuffer = new byte[m_OutBufferSize];
uint bytesToCopy = Math.Min(2 * m_InputSamples, (uint)buff.Length - (uint)buffPos);
if ((LameResult = Lame_encDll.Encode(m_hLameStream, buff, buffPos, (uint)bytesToCopy, m_OutBuffer, ref EncodedSize)) == Lame_encDll.ERR_SUCCESSFUL)
{
if (EncodedSize > 0)
{
bw.Write(m_OutBuffer, 0, (int)EncodedSize);
}
}
else
{
throw new ApplicationException(string.Format("Lame_encDll.Encode failed with the error code {0}", LameResult));
}
buffPos += (int)bytesToCopy;
}
}
finally
{
EncodedSize = 0;
if (Lame_encDll.Release(m_hLameStream, m_OutBuffer, ref EncodedSize) == Lame_encDll.ERR_SUCCESSFUL)
{
if (EncodedSize > 0)
{
bw.Write(m_OutBuffer, 0, (int)EncodedSize);
}
}
Lame_encDll.Close(m_hLameStream);
}
}
if (!MustCancel() && cfg.format.bWriteVBRHeader != 0)
{
uint err = Lame_encDll.WriteVBRHeader(destFile);
}
if (!MustCancel() && generateTags && ifiSlim != null)
{
ID3FileInfo ifi = new ID3FileInfo(destFile, false);
ifi.Album = StringUtils.Capitalize(ifiSlim.Album, WordCasing.CapitalizeWords);
ifi.Artist = StringUtils.Capitalize(ifiSlim.Artist, WordCasing.CapitalizeWords);
ifi.Genre = StringUtils.Capitalize(ifiSlim.Genre, WordCasing.CapitalizeWords);
ifi.Title = StringUtils.Capitalize(ifiSlim.Title, WordCasing.CapitalizeWords);
ifi.Track = ifiSlim.Track.GetValueOrDefault();
ifi.Year = ifiSlim.Year.GetValueOrDefault();
ifi.Save();
}
}
public static extern uint Init(LameEncConfig pbeConfig, ref uint dwSamples, ref uint dwBufferSize, ref uint phbeStream);
