private unsafe void DecodeAVIHeader(RiffParser rp, int length)
{
//if (length < sizeof(AVIMAINHEADER))
//{
// throw new RiffParserException(String.Format("Header size mismatch. Needed {0} but only have {1}",
// sizeof(AVIMAINHEADER), length));
//}
byte[] ba = new byte[length];
if (rp.ReadData(ba, 0, length) != length)
{
throw new RiffParserException("Problem reading AVI header.");
}
fixed(Byte *bp = &ba[0])
{
AVIMAINHEADER *avi = (AVIMAINHEADER *)bp;
m_frameRate = avi->dwMicroSecPerFrame;
m_height = avi->dwHeight;
m_maxBitRate = avi->dwMaxBytesPerSec;
m_numStreams = avi->dwStreams;
m_totalFrames = avi->dwTotalFrames;
m_width = avi->dwWidth;
}
}
/// <summary>
/// Handle chunk elements found in the AVI file. Ignores unknown chunks and
/// </summary>
/// <param name="rp"></param>
/// <param name="FourCC"></param>
/// <param name="unpaddedLength"></param>
/// <param name="paddedLength"></param>
private void ProcessAVIChunk(RiffParser rp, int FourCC, int unpaddedLength, int paddedLength)
{
if (AviRiffData.ckidMainAVIHeader == FourCC)
{
// Main AVI header
DecodeAVIHeader(rp, paddedLength);
}
else if (AviRiffData.ckidAVIStreamHeader == FourCC)
{
// Stream header
DecodeAVIStream(rp, paddedLength);
}
else if (AviRiffData.ckidAVIISFT == FourCC)
{
Byte[] ba = new byte[paddedLength];
rp.ReadData(ba, 0, paddedLength);
StringBuilder sb = new StringBuilder(unpaddedLength);
for (int i = 0; i < unpaddedLength; ++i)
{
if (0 != ba[i])
{
sb.Append((char)ba[i]);
}
}
m_isft = sb.ToString();
}
else
{
// Unknon chunk - skip
rp.SkipData(paddedLength);
}
}
private void ProcessWaveChunk(RiffParser rp, int FourCC, int unpaddedLength, int length)
{
// Is this a 'fmt' chunk?
if (AviRiffData.ckidWaveFMT == FourCC)
{
DecodeWave(rp, length);
}
else
{
rp.SkipData(length);
}
}
private unsafe void DecodeAVIStream(RiffParser rp, int length)
{
byte[] ba = new byte[length];
if (rp.ReadData(ba, 0, length) != length)
{
throw new RiffParserException("Problem reading AVI header.");
}
fixed(Byte *bp = &ba[0])
{
AVISTREAMHEADER *avi = (AVISTREAMHEADER *)bp;
if (AviRiffData.streamtypeVIDEO == avi->fccType)
{
m_vidHandler = RiffParser.FromFourCC(avi->fccHandler);
if (avi->dwScale > 0)
{
m_vidDataRate = (double)avi->dwRate / (double)avi->dwScale;
}
else
{
m_vidDataRate = 0.0;
}
}
else if (AviRiffData.streamtypeAUDIO == avi->fccType)
{
if (AviRiffData.ckidMP3 == avi->fccHandler)
{
m_audHandler = "MP3";
}
else
{
m_audHandler = RiffParser.FromFourCC(avi->fccHandler);
}
if (avi->dwScale > 0)
{
m_audDataRate = 8.0 * (double)avi->dwRate / (double)avi->dwScale;
if (avi->dwSampleSize > 0)
{
m_audDataRate /= (double)avi->dwSampleSize;
}
}
else
{
m_audDataRate = 0.0;
}
}
}
}
private unsafe void DecodeWave(RiffParser rp, int length)
{
byte[] ba = new byte[length];
rp.ReadData(ba, 0, length);
fixed(byte *bp = &ba[0])
{
WAVEFORMATEX *wave = (WAVEFORMATEX *)bp;
m_numChannels = wave->nChannels;
m_bitsPerSec = wave->nAvgBytesPerSec;
m_bitsPerSample = wave->wBitsPerSample;
m_samplesPerSec = wave->nSamplesPerSec;
}
}
/// <summary>
/// Handle List elements found in the AVI file. Ignores unknown lists and recursively looks
/// at the content of known lists.
/// </summary>
/// <param name="rp"></param>
/// <param name="FourCC"></param>
/// <param name="length"></param>
private void ProcessAVIList(RiffParser rp, int FourCC, int length)
{
RiffParser.ProcessChunkElement pac = new RiffParser.ProcessChunkElement(ProcessAVIChunk);
RiffParser.ProcessListElement pal = new RiffParser.ProcessListElement(ProcessAVIList);
// Is this the header?
if ((AviRiffData.ckidAVIHeaderList == FourCC) ||
(AviRiffData.ckidAVIStreamList == FourCC) ||
(AviRiffData.ckidINFOList == FourCC))
{
while (length > 0)
{
if (false == rp.ReadElement(ref length, pac, pal))
{
break;
}
}
}
else
{
// Unknown lists - ignore
rp.SkipData(length);
}
}
private void SetFrameRateFromVideoFile()
{
double frameRate = 0;
// Cursor = Cursors.WaitCursor; will Invalid operation exection (Note: Belong to UI thread, the expection won't crash the app 'CAREFUL')
try
{
if (!string.IsNullOrEmpty(_videoFileName) && File.Exists(_videoFileName))
{
var ext = Path.GetExtension(_videoFileName).ToLowerInvariant();
if (ext == ".mkv")
{
bool isValid = false;
using (var mkv = new VideoFormats.Mkv())
{
bool hasConstantFrameRate = true;
int pixelWidth = 0;
int pixelHeight = 0;
double millisecsDuration = 0;
string videoCodec = string.Empty;
mkv.GetMatroskaInfo(_videoFileName, ref isValid, ref hasConstantFrameRate, ref frameRate, ref pixelWidth, ref pixelHeight, ref millisecsDuration, ref videoCodec);
}
if (!isValid)
{
return;
}
}
if (frameRate < 1 && (ext == ".mp4" || ext == ".mov" || ext == ".m4v"))
{
var mp4 = new VideoFormats.MP4(_videoFileName);
frameRate = mp4.FrameRate;
}
if (frameRate < 1)
{
using (var rp = new VideoFormats.RiffParser())
{
var dh = new VideoFormats.RiffDecodeHeader(rp);
rp.OpenFile(_videoFileName);
if (VideoFormats.RiffParser.ckidAVI == rp.FileType)
{
dh.ProcessMainAVI();
frameRate = dh.FrameRate;
}
}
}
}
//CheckForIllegalCrossThreadCalls = false;
Invoke(new MethodInvoker(() =>
{
double minDiff = 100;
var index = 0;
for (int i = 1; i < comboBoxFrameRate.Items.Count; i++)
{
var element = comboBoxFrameRate.Items[i];
double d;
if (double.TryParse(element.ToString(), NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out d))
{
double diff = Math.Abs(d - frameRate);
if (diff < 0.01 && diff < minDiff)
{
index = i;
minDiff = diff;
}
}
}
comboBoxFrameRate.SelectedIndex = index;
}));
}
catch
{
}
// Restore controls stats
Invoke(new MethodInvoker(() =>
{
Cursor = Cursors.Default;
labelStatus.Text = string.Empty;
EnableDisableActionButtons(true);
labelStatus.ForeColor = System.Drawing.Color.Black;
}));
}
/// <summary>
/// Default list element handler - skip the entire list
/// </summary>
/// <param name="rp"></param>
/// <param name="FourCC"></param>
/// <param name="length"></param>
private void ProcessList(RiffParser rp, int FourCC, int length)
{
rp.SkipData(length);
}
public RiffDecodeHeader(RiffParser rp)
{
m_parser = rp;
}