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.MainAviHeader == fourCc)
{
DecodeAviHeader(rp, paddedLength); // Main AVI header
}
else if (AviRiffData.AviStreamHeader == fourCc)
{
DecodeAviStream(rp, paddedLength); // Stream header
}
else if (AviRiffData.AviIsft == fourCc)
{
var ba = new byte[paddedLength];
rp.ReadData(ba, 0, paddedLength);
var sb = new StringBuilder(unpaddedLength);
for (int i = 0; i < unpaddedLength; ++i)
{
if (0 != ba[i])
{
sb.Append((char)ba[i]);
}
}
_isft = sb.ToString();
}
else
{
rp.SkipData(paddedLength); // Unknown chunk - skip
}
}
public static VideoInfo TryReadVideoInfoViaAviHeader(string fileName)
{
var info = new VideoInfo { Success = false };
try
{
using (var rp = new RiffParser())
{
if (rp.TryOpenFile(fileName) && rp.FileType == RiffParser.ckidAVI)
{
var dh = new RiffDecodeHeader(rp);
dh.ProcessMainAVI();
info.FileType = RiffParser.FromFourCC(rp.FileType);
info.Width = dh.Width;
info.Height = dh.Height;
info.FramesPerSecond = dh.FrameRate;
info.TotalFrames = dh.TotalFrames;
info.TotalMilliseconds = dh.TotalMilliseconds;
info.TotalSeconds = info.TotalMilliseconds / TimeCode.BaseUnit;
info.VideoCodec = dh.VideoHandler;
info.Success = true;
}
}
}
catch
{
}
return info;
}
/// <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 DecodeAviStream(RiffParser rp, int length)
{
var ba = new byte[length];
if (rp.ReadData(ba, 0, length) != length)
{
throw new RiffParserException("Problem reading AVI header.");
}
var aviStreamHeader = new AviStreamHeader
{
FccType = GetInt(ba, 0),
FccHandler = GetInt(ba, 4),
Scale = GetInt(ba, 20),
Rate = GetInt(ba, 24),
Start = GetInt(ba, 28),
Length = GetInt(ba, 32),
SampleSize = GetInt(ba, 44),
};
if (AviRiffData.StreamTypeVideo == aviStreamHeader.FccType)
{
_vidHandler = RiffParser.FromFourCc(aviStreamHeader.FccHandler);
if (aviStreamHeader.Scale > 0)
{
_vidDataRate = (double)aviStreamHeader.Rate / aviStreamHeader.Scale;
}
else
{
_vidDataRate = 0.0;
}
}
else if (AviRiffData.StreamTypeAudio == aviStreamHeader.FccType)
{
if (AviRiffData.Mp3 == aviStreamHeader.FccHandler)
{
_audHandler = "MP3";
}
else
{
_audHandler = RiffParser.FromFourCc(aviStreamHeader.FccHandler);
}
if (aviStreamHeader.Scale > 0)
{
_audDataRate = 8.0 * aviStreamHeader.Rate / aviStreamHeader.Scale;
if (aviStreamHeader.SampleSize > 0)
{
_audDataRate /= aviStreamHeader.SampleSize;
}
}
else
{
_audDataRate = 0.0;
}
}
}
private void DecodeAviStream(RiffParser rp, int length)
{
var ba = new byte[length];
if (rp.ReadData(ba, 0, length) != length)
{
throw new RiffParserException("Problem reading AVI header.");
}
var aviStreamHeader = new AVISTREAMHEADER
{
fccType = GetInt(ba, 0),
fccHandler = GetInt(ba, 4),
dwScale = GetInt(ba, 20),
dwRate = GetInt(ba, 24),
dwStart = GetInt(ba, 28),
dwLength = GetInt(ba, 32),
dwSampleSize = GetInt(ba, 44),
};
if (AviRiffData.streamtypeVIDEO == aviStreamHeader.fccType)
{
_vidHandler = RiffParser.FromFourCc(aviStreamHeader.fccHandler);
if (aviStreamHeader.dwScale > 0)
{
_vidDataRate = (double)aviStreamHeader.dwRate / aviStreamHeader.dwScale;
}
else
{
_vidDataRate = 0.0;
}
}
else if (AviRiffData.streamtypeAUDIO == aviStreamHeader.fccType)
{
if (AviRiffData.ckidMP3 == aviStreamHeader.fccHandler)
{
_audHandler = "MP3";
}
else
{
_audHandler = RiffParser.FromFourCc(aviStreamHeader.fccHandler);
}
if (aviStreamHeader.dwScale > 0)
{
_audDataRate = 8.0 * aviStreamHeader.dwRate / aviStreamHeader.dwScale;
if (aviStreamHeader.dwSampleSize > 0)
{
_audDataRate /= aviStreamHeader.dwSampleSize;
}
}
else
{
_audDataRate = 0.0;
}
}
}
private void DecodeWave(RiffParser rp, int length)
{
var ba = new byte[length];
rp.ReadData(ba, 0, length);
_numChannels = GetShort(ba, 2);
_bitsPerSec = GetInt(ba, 8);
_bitsPerSample = GetShort(ba, 14);
_samplesPerSec = GetInt(ba, 4);
}
private void ProcessWaveChunk(RiffParser rp, int fourCc, int unpaddedLength, int length)
{
// Is this a 'fmt' chunk?
if (AviRiffData.WaveFmt == fourCc)
{
DecodeWave(rp, length);
}
else
{
rp.SkipData(length);
}
}
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;
}
}
private void DecodeAviHeader(RiffParser rp, int length)
{
var ba = new byte[length];
if (rp.ReadData(ba, 0, length) != length)
{
throw new RiffParserException("Problem reading AVI header.");
}
_frameRate = GetInt(ba, 0);
_maxBitRate = GetInt(ba, 4);
_totalFrames = GetInt(ba, 16);
_numStreams = GetInt(ba, 24);
_width = GetInt(ba, 32);
_height = GetInt(ba, 36);
}
/// <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 = ProcessAviChunk;
RiffParser.ProcessListElement pal = ProcessAviList;
// Is this the header?
if (AviRiffData.AviHeaderList == fourCc || AviRiffData.AviStreamList == fourCc || AviRiffData.InfoList == fourCc)
{
while (length > 0)
{
if (false == rp.ReadElement(ref length, pac, pal))
{
break;
}
}
}
else
{
rp.SkipData(length); // Unknown lists - ignore
}
}
/// <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 = ProcessAVIChunk;
RiffParser.ProcessListElement pal = 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 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;
}
}
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 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 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 = ProcessAVIChunk;
RiffParser.ProcessListElement pal = 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);
}
}
/// <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);
}
}
/// <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;
}
public RiffDecodeHeader(RiffParser rp)
{
Parser = rp;
}
/// <summary>
/// Default list element handler - skip the entire list
/// </summary>
/// <param name="rp"></param>
/// <param name="fourCc"></param>
/// <param name="length"></param>
private static void ProcessList(RiffParser rp, int fourCc, int length)
{
rp.SkipData(length);
}
/// <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);
}
