public Atrac9FormatBuilder(byte[][] audioData, Atrac9Config config, int sampleCount, int encoderDelay)
{
AudioData = audioData ?? throw new ArgumentNullException(nameof(audioData));
Config = config ?? throw new ArgumentNullException(nameof(config));
SampleRate = config.SampleRate;
SampleCount = sampleCount;
EncoderDelay = encoderDelay;
}
public Frame(Atrac9Config config)
{
Config = config;
Blocks = new Block[config.ChannelConfig.BlockCount];
for (int i = 0; i < config.ChannelConfig.BlockCount; i++)
{
Blocks[i] = new Block(this, i);
}
}
public override void PrintSpecificMetadata(object metadata, StringBuilder builder)
{
var at9Structure = metadata as At9Structure;
Atrac9Config config = at9Structure?.Config;
if (at9Structure == null || config == null)
{
throw new InvalidDataException("Could not parse file metadata.");
}
builder.AppendLine();
builder.AppendLine($"ATRAC9 version: {at9Structure.Version}");
builder.AppendLine($"Superframe count: {at9Structure.SuperframeCount}");
builder.AppendLine($"Superframe size: {config.SuperframeBytes} bytes");
builder.AppendLine($"Frames per superframe: {config.FramesPerSuperframe}");
builder.AppendLine($"Encoder delay: {at9Structure.EncoderDelay} samples");
}
public override Common ToCommon(object metadata)
{
var at9Structure = metadata as At9Structure;
Atrac9Config config = at9Structure?.Config;
if (at9Structure == null || config == null)
{
throw new InvalidDataException("Could not parse file metadata.");
}
return(new Common
{
SampleCount = at9Structure.SampleCount,
SampleRate = config.SampleRate,
ChannelCount = config.ChannelCount,
Format = AudioFormat.Atrac9,
Looping = at9Structure.Looping,
LoopStart = at9Structure.LoopStart,
LoopEnd = at9Structure.LoopEnd
});
}
private short[][] Decode(CodecParameters parameters)
{
IProgressReport progress = parameters?.Progress;
progress?.SetTotal(AudioData.Length);
var decoder = new Atrac9Decoder();
decoder.Initialize(Config.ConfigData);
Atrac9Config config = decoder.Config;
var pcmOut = CreateJaggedArray <short[][]>(config.ChannelCount, SampleCount);
var pcmBuffer = CreateJaggedArray <short[][]>(config.ChannelCount, config.SuperframeSamples);
for (int i = 0; i < AudioData.Length; i++)
{
decoder.Decode(AudioData[i], pcmBuffer);
CopyBuffer(pcmBuffer, pcmOut, EncoderDelay, i);
progress?.ReportAdd(1);
}
return(pcmOut);
}
public At9DataChunk(RiffParser parser, BinaryReader reader) : base(reader)
{
// Do not trust the BlockAlign field in the fmt chunk to equal the superframe size.
// Some AT9 files have an invalid number in there.
// Calculate the size using the ATRAC9 DataConfig instead.
At9WaveExtensible ext = parser.GetSubChunk <WaveFmtChunk>("fmt ")?.Ext as At9WaveExtensible ??
throw new InvalidDataException("fmt chunk must come before data chunk");
At9FactChunk fact = parser.GetSubChunk <At9FactChunk>("fact") ??
throw new InvalidDataException("fact chunk must come before data chunk");
var config = new Atrac9Config(ext.ConfigData);
FrameCount = (fact.SampleCount + fact.EncoderDelaySamples).DivideByRoundUp(config.SuperframeSamples);
int dataSize = FrameCount * config.SuperframeBytes;
if (dataSize > reader.BaseStream.Length - reader.BaseStream.Position)
{
throw new InvalidDataException("Required AT9 length is greater than the number of bytes remaining in the file.");
}
AudioData = reader.BaseStream.DeInterleave(dataSize, config.SuperframeBytes, FrameCount);
}
