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GenerateFourierData now read wav file in smaller chuncks (4gb byte array is a bad idea)

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git-svn-id: https://subtitleedit.googlecode.com/svn/trunk@463 99eadd0c-20b8-1223-b5c4-2a2b2df33de2
This commit is contained in:
niksedk 2011-06-05 20:24:10 +00:00
parent 29a5306035
commit cc9d9bde71
1 changed files with 49 additions and 32 deletions
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81
src/Logic/WavePeak.cs
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@ -13,7 +13,7 @@ namespace Nikse.SubtitleEdit.Logic
private byte[] _headerData;
public string ChunkId { get; private set; }
public int ChunkSize { get; private set; }
public uint ChunkSize { get; private set; }
public string Format { get; private set; }
public string FmtId { get; private set; }
public int FmtChunkSize { get; private set; }
@ -47,7 +47,7 @@ namespace Nikse.SubtitleEdit.Logic
/// <summary>
/// Size of sound data
/// </summary>
public int DataChunkSize { get; private set; }
public uint DataChunkSize { get; private set; }
public int DataStartPosition { get; private set; }
public WaveHeader(Stream stream)
@ -60,7 +60,8 @@ namespace Nikse.SubtitleEdit.Logic
// constant header
ChunkId = Encoding.UTF8.GetString(buffer, 0, 4);
ChunkSize = BitConverter.ToInt32(buffer, 4);
// ChunkSize = BitConverter.ToInt32(buffer, 4);
ChunkSize = BitConverter.ToUInt32(buffer, 4);
Format = Encoding.UTF8.GetString(buffer, 8, 4);
FmtId = Encoding.UTF8.GetString(buffer, 12, 4);
FmtChunkSize = BitConverter.ToInt32(buffer, 16);
@ -80,7 +81,8 @@ namespace Nikse.SubtitleEdit.Logic
stream.Position = ConstantHeaderSize + FmtChunkSize;
stream.Read(buffer, 0, buffer.Length);
DataId = Encoding.UTF8.GetString(buffer, 0, 4);
DataChunkSize = BitConverter.ToInt32(buffer, 4);
//DataChunkSize = (uint) BitConverter.ToInt32(buffer, 4);
DataChunkSize = BitConverter.ToUInt32(buffer, 4);
DataStartPosition = ConstantHeaderSize + FmtChunkSize + 8;
_headerData = new byte[DataStartPosition];
@ -295,6 +297,15 @@ namespace Nikse.SubtitleEdit.Logic
return result;
}
private int Read16BitValueFromStream(ref int index)
{
byte[] buffer = new byte[2];
_stream.Read(buffer, 0, 2);
int result = BitConverter.ToInt16(buffer, 0);
index += 2;
return result;
}
private int ReadValue24Bit(ref int index)
{
byte[] buffer = new byte[4];
@ -368,11 +379,6 @@ namespace Nikse.SubtitleEdit.Logic
// determine how to read sample values
ReadSampleDataValueDelegate readSampleDataValue = GetSampleDataRerader();
// load data
_data = new byte[Header.DataChunkSize];
_stream.Position = Header.DataStartPosition;
int bytesRead = _stream.Read(_data, 0, _data.Length);
// set up one column of the spectrogram
Color[] palette = new Color[NFFT];
for (int colorIndex = 0; colorIndex < NFFT; colorIndex++)
@ -386,32 +392,43 @@ namespace Nikse.SubtitleEdit.Logic
int sampleSize = NFFT * 1024; // 1024 = bitmap width
int count = 0;
long totalSamples = 0;
while (index + Header.NumberOfChannels < Header.DataChunkSize)
{
int value = 0;
for (int channelNumber = 0; channelNumber < Header.NumberOfChannels; channelNumber++)
{
value += readSampleDataValue.Invoke(ref index);
}
value = value / Header.NumberOfChannels;
if (value < DataMinValue)
DataMinValue = value;
if (value > DataMaxValue)
DataMaxValue = value;
samples.Add(value);
totalSamples++;
if (samples.Count == sampleSize)
// load data in smaller parts
_data = new byte[Header.BytesPerSecond];
_stream.Position = Header.DataStartPosition;
int bytesRead = _stream.Read(_data, 0, _data.Length);
while (bytesRead == Header.BytesPerSecond)
{
while (index < Header.BytesPerSecond)
{
var samplesAsReal = new double[sampleSize];
for (int k = 0; k < sampleSize; k++)
samplesAsReal[k] = samples[k] / divider;
Bitmap bmp = DrawSpectrogram(NFFT, samplesAsReal, f, palette);
bmp.Save(Path.Combine(spectrumDirectory, count + ".gif"), System.Drawing.Imaging.ImageFormat.Gif);
bitmaps.Add(bmp); // save serialized gif instead????
samples = new List<int>();
count++;
int value = 0;
for (int channelNumber = 0; channelNumber < Header.NumberOfChannels; channelNumber++)
{
value += readSampleDataValue.Invoke(ref index);
}
value = value / Header.NumberOfChannels;
if (value < DataMinValue)
DataMinValue = value;
if (value > DataMaxValue)
DataMaxValue = value;
samples.Add(value);
totalSamples++;
if (samples.Count == sampleSize)
{
var samplesAsReal = new double[sampleSize];
for (int k = 0; k < sampleSize; k++)
samplesAsReal[k] = samples[k] / divider;
Bitmap bmp = DrawSpectrogram(NFFT, samplesAsReal, f, palette);
bmp.Save(Path.Combine(spectrumDirectory, count + ".gif"), System.Drawing.Imaging.ImageFormat.Gif);
bitmaps.Add(bmp); // save serialized gif instead????
samples = new List<int>();
count++;
}
}
bytesRead = _stream.Read(_data, 0, _data.Length);
index = 0;
}
if (samples.Count > 0)