/// <summary>
/// Returns the fully mixed audio of the Flipnote, Including its Sound Effects.
/// Returns Null if no audio exists.
/// </summary>
/// <param name="flip"></param>
/// <param name="sampleRate"></param>
/// <returns>Signed 16-bit PCM audio</returns>
public byte[] GetWavBGM(PPMFile flip, int sampleRate = 32768)
{
// start decoding
AdpcmDecoder encoder = new AdpcmDecoder(flip);
var decoded = encoder.getAudioMasterPcm(sampleRate);
if (decoded.Length > 0)
{
byte[] output = new byte[decoded.Length];
// thank you https://github.com/meemo
for (int i = 0; i < decoded.Length; i += 2)
{
try
{
output[i] = (byte)(decoded[i + 1] & 0xff);
output[i + 1] = (byte)(decoded[i] >> 8);
}
catch (Exception)
{
}
}
var a = new WavePcmFormat(output, 1, (uint)(sampleRate / 2), 16);
return(a.ToBytesArray());
}
return(null);
}
public static PPMFile Create(PPMAuthor author, List <PPMFrame> frames, byte[] audio, bool ignoreMetadata = false)
{
var file = new PPMFile();
file.FrameCount = (ushort)(frames.Count - 1);
file.FormatVersion = 0x24;
if (!ignoreMetadata)
{
file.RootAuthor = author;
file.ParentAuthor = author;
file.CurrentAuthor = author;
string mac6 = string.Join("", BitConverter.GetBytes(author.Id).Take(3).Reverse().Select(t => t.ToString("X2")));
var asm = Assembly.GetEntryAssembly().GetName().Version;
var dt = DateTime.UtcNow;
var fnVM = ((byte)asm.Major).ToString("X2");
var fnVm = ((byte)asm.Minor).ToString("X2");
var fnYY = (byte)(dt.Year - 2009);
var fnMD = dt.Month * 32 + dt.Day;
var fnTi = (((dt.Hour * 3600 + dt.Minute * 60 + dt.Second) % 4096) >> 1) + (fnMD > 255 ? 1 : 0);
fnMD = (byte)fnMD;
var fnYMD = (fnYY << 9) + fnMD;
var H6_9 = fnYMD.ToString("X4");
var H89 = ((byte)fnMD).ToString("X2");
var HABC = fnTi.ToString("X3");
string _13str = $"80{fnVM}{fnVm}{H6_9}{HABC}";
string nEdited = 0.ToString().PadLeft(3, '0');
var filename = $"{mac6}_{_13str}_{nEdited}.ppm";
var rawfn = new byte[18];
for (int i = 0; i < 3; i++)
{
rawfn[i] = byte.Parse("" + mac6[2 * i] + mac6[2 * i + 1], System.Globalization.NumberStyles.HexNumber);
}
for (int i = 3; i < 16; i++)
{
rawfn[i] = (byte)_13str[i - 3];
}
rawfn[16] = rawfn[17] = 0;
file.ParentFilename = new PPMFilename(rawfn);
file.CurrentFilename = new PPMFilename(rawfn);
var ByteRootFileFragment = new byte[8];
for (int i = 0; i < 3; i++)
{
ByteRootFileFragment[i] =
byte.Parse("" + mac6[2 * i] + mac6[2 * i + 1], System.Globalization.NumberStyles.HexNumber);
}
for (int i = 3; i < 8; i++)
{
ByteRootFileFragment[i] =
(byte)((byte.Parse("" + _13str[2 * (i - 3)], System.Globalization.NumberStyles.HexNumber) << 4)
+ byte.Parse("" + _13str[2 * (i - 3) + 1], System.Globalization.NumberStyles.HexNumber));
}
file.RootFileFragment = new PPMFileFragment(ByteRootFileFragment);
file.Timestamp = new PPMTimestamp((uint)((dt - new DateTime(2000, 1, 1, 0, 0, 0)).TotalSeconds));
file.Thumbnail = new PPMThumbnail(new byte[0x600]);
file.ThumbnailFrameIndex = 0;
}
// write the audio data
uint animDataSize = (uint)(8 + 4 * frames.Count);
file.AnimationFlags = 0x43;
file.FrameOffsetTableSize = (ushort)(4 * frames.Count);
file.Frames = new PPMFrame[frames.Count];
//SoundEffectFlags = new byte[frames.Count];
for (int i = 0; i < frames.Count; i++)
{
file.Frames[i] = frames[i];
animDataSize += (uint)file.Frames[i].ToByteArray().Length;
}
while ((animDataSize & 0x3) != 0)
{
animDataSize++;
}
file.AnimationDataSize = animDataSize;
file.Audio = new PPMAudio();
file.Audio.SoundData.RawBGM = audio;
file.Audio.SoundHeader.BGMTrackSize = (uint)file.Audio.SoundData.RawBGM.Length;
file.Audio.SoundHeader.SE1TrackSize = 0;
file.Audio.SoundHeader.SE2TrackSize = 0;
file.Audio.SoundHeader.SE2TrackSize = 0;
file.SoundDataSize = (uint)file.Audio.SoundData.RawBGM.Length;
file.Audio.SoundHeader.CurrentFramespeed = 0;
file.Audio.SoundHeader.RecordingBGMFramespeed = 0;
return(file);
}