private void ApplyID3Tag(ID3TagData tag)
{
if (tag == null)
return;
if (!string.IsNullOrEmpty(tag.Title))
_lame.ID3SetTitle(tag.Title);
if (!string.IsNullOrEmpty(tag.Artist))
_lame.ID3SetArtist(tag.Artist);
if (!string.IsNullOrEmpty(tag.Album))
_lame.ID3SetAlbum(tag.Album);
if (!string.IsNullOrEmpty(tag.Year))
_lame.ID3SetYear(tag.Year);
if (!string.IsNullOrEmpty(tag.Comment))
_lame.ID3SetComment(tag.Comment);
if (!string.IsNullOrEmpty(tag.Genre))
_lame.ID3SetGenre(tag.Genre);
if (!string.IsNullOrEmpty(tag.Track))
_lame.ID3SetTrack(tag.Track);
if (!string.IsNullOrEmpty(tag.Subtitle))
_lame.ID3SetFieldValue(string.Format("TIT3={0}", tag.Subtitle));
if (!string.IsNullOrEmpty(tag.AlbumArtist))
_lame.ID3SetFieldValue(string.Format("TPE2={0}", tag.AlbumArtist));
if (tag.AlbumArt != null && tag.AlbumArt.Length > 0 && tag.AlbumArt.Length < 131072)
_lame.ID3SetAlbumArt(tag.AlbumArt);
}
/// <summary>Setup ID3 tag with supplied information</summary>
/// <param name="tag">ID3 data</param>
private void ApplyID3Tag(ID3TagData tag)
{
if (tag == null)
{
return;
}
// Apply standard ID3 fields
if (!string.IsNullOrEmpty(tag.Title))
{
_lame.ID3SetTitle(tag.Title);
}
if (!string.IsNullOrEmpty(tag.Artist))
{
_lame.ID3SetArtist(tag.Artist);
}
if (!string.IsNullOrEmpty(tag.Album))
{
_lame.ID3SetAlbum(tag.Album);
}
if (!string.IsNullOrEmpty(tag.Year))
{
_lame.ID3SetYear(tag.Year);
}
if (!string.IsNullOrEmpty(tag.Comment))
{
_lame.ID3SetComment(tag.Comment);
}
if (!string.IsNullOrEmpty(tag.Genre))
{
_lame.ID3SetGenre(tag.Genre);
}
if (!string.IsNullOrEmpty(tag.Track))
{
_lame.ID3SetTrack(tag.Track);
}
// Apply standard ID3 fields that are not directly supported by LAME
if (!string.IsNullOrEmpty(tag.Subtitle))
{
_lame.ID3SetFieldValue(string.Format("TIT3={0}", tag.Subtitle));
}
if (!string.IsNullOrEmpty(tag.AlbumArtist))
{
_lame.ID3SetFieldValue(string.Format("TPE2={0}", tag.AlbumArtist));
}
// Add user-defined tags if present
// NB: LAME handles the replacement of duplicates.
if (tag.UserDefinedTags?.Length > 0)
{
foreach (var userDefinedTag in tag.UserDefinedTags)
{
_lame.ID3SetFieldValue(string.Format("TXXX={0}", userDefinedTag));
}
}
// Set the album art if supplied and within size limits
if (tag.AlbumArt?.Length > 0 && tag.AlbumArt.Length < 131072)
{
_lame.ID3SetAlbumArt(tag.AlbumArt);
}
}
/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="bitRate">Output bit rate in kbps</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, int bitRate, ID3TagData id3 = null)
: base()
{
Loader.Init();
//if (!Loader.Initialized)
// Loader.Initialized = false;
// sanity check
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
if (format == null)
{
throw new ArgumentNullException("format");
}
// check for unsupported wave formats
if (format.Channels != 1 && format.Channels != 2)
{
throw new ArgumentException(string.Format("Unsupported number of channels {0}", format.Channels), "format");
}
if (format.Encoding != WaveFormatEncoding.Pcm && format.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new ArgumentException(string.Format("Unsupported encoding format {0}", format.Encoding.ToString()), "format");
}
if (format.Encoding == WaveFormatEncoding.Pcm && format.BitsPerSample != 16)
{
throw new ArgumentException(string.Format("Unsupported PCM sample size {0}", format.BitsPerSample), "format");
}
if (format.Encoding == WaveFormatEncoding.IeeeFloat && format.BitsPerSample != 32)
{
throw new ArgumentException(string.Format("Unsupported Float sample size {0}", format.BitsPerSample), "format");
}
if (format.SampleRate < 8000 || format.SampleRate > 48000)
{
throw new ArgumentException(string.Format("Unsupported Sample Rate {0}", format.SampleRate), "format");
}
// select encoder function that matches data format
if (format.Encoding == WaveFormatEncoding.Pcm)
{
if (format.Channels == 1)
{
_encode = encode_pcm_16_mono;
}
else
{
_encode = encode_pcm_16_stereo;
}
}
else
{
if (format.Channels == 1)
{
_encode = encode_float_mono;
}
else
{
_encode = encode_float_stereo;
}
}
// Set base properties
this.inputFormat = format;
this.outStream = outStream;
this.disposeOutput = false;
// Allocate buffers based on sample rate
this.inBuffer = new ArrayUnion(format.AverageBytesPerSecond);
this.outBuffer = new byte[format.SampleRate * 5 / 4 + 7200];
// Initialize lame library
this._lame = new LibMp3Lame();
this._lame.InputSampleRate = format.SampleRate;
this._lame.NumChannels = format.Channels;
this._lame.BitRate = bitRate;
if (id3 != null)
{
ApplyID3Tag(id3);
}
this._lame.InitParams();
}
/// <summary>Create MP3FileWriter to write to a file on disk</summary>
/// <param name="outFileName">Name of file to create</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="bitRate">Output bit rate in kbps</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(string outFileName, WaveFormat format, int bitRate, ID3TagData id3 = null)
: this(File.Create(outFileName), format, bitRate, id3)
{
this.disposeOutput = true;
}
/// <summary>Create MP3FileWriter to write to a file on disk</summary>
/// <param name="outFileName">Name of file to create</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="quality">LAME quality preset</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(string outFileName, WaveFormat format, NAudio.Lame.LAMEPreset quality, ID3TagData id3 = null)
: this(File.Create(outFileName), format, quality, id3)
{
this.disposeOutput = true;
}
/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="quality">LAME quality preset</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, LAMEPreset quality, ID3TagData id3 = null)
: base()
{
if (format == null)
{
throw new ArgumentNullException("format");
}
// check for unsupported wave formats
if (format.Channels != 1 && format.Channels != 2)
{
throw new ArgumentException($"Unsupported number of channels {format.Channels}", "format");
}
if (format.Encoding != WaveFormatEncoding.Pcm && format.Encoding != WaveFormatEncoding.IeeeFloat)
{
throw new ArgumentException($"Unsupported encoding format {format.Encoding}", "format");
}
if (format.Encoding == WaveFormatEncoding.Pcm && format.BitsPerSample != 16)
{
throw new ArgumentException($"Unsupported PCM sample size {format.BitsPerSample}", "format");
}
if (format.Encoding == WaveFormatEncoding.IeeeFloat && format.BitsPerSample != 32)
{
throw new ArgumentException($"Unsupported Float sample size {format.BitsPerSample}", "format");
}
if (format.SampleRate < 8000 || format.SampleRate > 48000)
{
throw new ArgumentException($"Unsupported Sample Rate {format.SampleRate}", "format");
}
// select encoder function that matches data format
if (format.Encoding == WaveFormatEncoding.Pcm)
{
if (format.Channels == 1)
{
_encode = Encode_pcm_16_mono;
}
else
{
_encode = Encode_pcm_16_stereo;
}
}
else
{
if (format.Channels == 1)
{
_encode = Encode_float_mono;
}
else
{
_encode = Encode_float_stereo;
}
}
// Set base properties
_inputFormat = format;
_outStream = outStream ?? throw new ArgumentNullException("outStream");
_disposeOutput = false;
// Allocate buffers based on sample rate
_inBuffer = new ArrayUnion(format.AverageBytesPerSecond);
_outBuffer = new byte[format.SampleRate * 5 / 4 + 7200];
// Initialize lame library
_lame = new LibMp3Lame
{
InputSampleRate = format.SampleRate,
NumChannels = format.Channels
};
_lame.SetPreset((int)quality);
if (id3 != null)
{
ApplyID3Tag(id3);
}
_lame.InitParams();
}
/// <summary>
/// Decode frames from ID3 tag
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="size"></param>
/// <param name="flags"></param>
/// <returns></returns>
private static ID3TagData InternalDecode(byte[] buffer, int offset, int size, byte flags)
{
// copy tag body data into array and remove unsynchronization padding if present
byte[] bytes = new byte[size];
Array.Copy(buffer, offset, bytes, 0, size);
if ((flags & 0x80) != 0)
{
bytes = UnsyncBytes(bytes);
}
var res = new ID3TagData();
int pos = 0;
// skip extended header if present
if ((flags & 0x40) != 0)
{
var ehSize = DecodeBEInt32(bytes, pos);
pos += ehSize + 4;
}
// load all frames from the tag buffer
for (var frame = ID3FrameData.ReadFrame(bytes, pos, out int frameSize); frameSize > 0 && frame != null; frame = ID3FrameData.ReadFrame(bytes, pos, out frameSize))
{
switch (frame.FrameID)
{
case "TIT2":
res.Title = frame.ParseString();
break;
case "TPE1":
res.Artist = frame.ParseString();
break;
case "TALB":
res.Album = frame.ParseString();
break;
case "TYER":
res.Year = frame.ParseString();
break;
case "COMM":
res.Comment = frame.ParseCommentText();
break;
case "TCON":
res.Genre = frame.ParseString();
break;
case "TRCK":
res.Track = frame.ParseString();
break;
case "TIT3":
res.Subtitle = frame.ParseString();
break;
case "TPE2":
res.AlbumArtist = frame.ParseString();
break;
case "TXXX":
{
var udt = frame.ParseUserDefinedText();
res.UserDefinedText[udt.Key] = udt.Value;
break;
}
case "APIC":
{
var pic = frame.ParseAPIC();
res.AlbumArt = pic?.ImageBytes;
break;
}
default:
break;
}
pos += frameSize;
}
return(res);
}
/// <summary>Setup ID3 tag with supplied information</summary>
/// <param name="tag">ID3 data</param>
private void ApplyID3Tag(ID3TagData tag)
{
if (tag == null)
{
return;
}
_lame.ID3Init();
// Apply standard ID3 fields
if (!string.IsNullOrEmpty(tag.Title))
{
_lame.ID3SetTitle(tag.Title);
}
if (!string.IsNullOrEmpty(tag.Artist))
{
_lame.ID3SetArtist(tag.Artist);
}
if (!string.IsNullOrEmpty(tag.Album))
{
_lame.ID3SetAlbum(tag.Album);
}
if (!string.IsNullOrEmpty(tag.Year))
{
_lame.ID3SetYear(tag.Year);
}
if (!string.IsNullOrEmpty(tag.Comment))
{
_lame.ID3SetComment(tag.Comment);
}
if (!string.IsNullOrEmpty(tag.Genre))
{
_lame.ID3SetGenre(tag.Genre);
}
if (!string.IsNullOrEmpty(tag.Track))
{
_lame.ID3SetTrack(tag.Track);
}
// Apply standard ID3 fields that are not directly supported by LAME
if (!string.IsNullOrEmpty(tag.Subtitle))
{
_lame.ID3SetFieldValue($"TIT3={tag.Subtitle}");
}
if (!string.IsNullOrEmpty(tag.AlbumArtist))
{
_lame.ID3SetFieldValue($"TPE2={tag.AlbumArtist}");
}
// Add user-defined tags if present
foreach (var kv in tag.UserDefinedText)
{
_lame.ID3SetFieldValue($"TXXX={kv.Key}={kv.Value}");
}
// Set the album art if supplied
if (tag.AlbumArt?.Length > 0)
{
_lame.ID3SetAlbumArt(tag.AlbumArt);
}
// check size of ID3 tag, if too large write it ourselves.
byte[] data = _lame.ID3GetID3v2Tag();
if (data.Length >= 32768)
{
_lame.ID3WriteTagAutomatic = false;
outStream.Write(data, 0, data.Length);
}
}
/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="quality">LAME quality preset</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, LAMEPreset quality, ID3TagData id3 = null)
: this(outStream, format, new LameConfig {
Preset = quality, ID3 = id3
})
{
}
/// <summary>Create MP3FileWriter to write to supplied stream</summary>
/// <param name="outStream">Stream to write encoded data to</param>
/// <param name="format">Input WaveFormat</param>
/// <param name="bitRate">Output bit rate in kbps</param>
/// <param name="id3">Optional ID3 data block</param>
public LameMP3FileWriter(Stream outStream, WaveFormat format, int bitRate, ID3TagData id3 = null)
: this(outStream, format, new LameConfig {
BitRate = bitRate, ID3 = id3
})
{
}