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; }