public IChunk ReadNextChunk() { if (BR.BaseStream.Position + 4 >= BR.BaseStream.Length) { BR.BaseStream.Position += 4; return null; } string chkid = (System.Text.UTF8Encoding.UTF8.GetString(BR.ReadBytes(4), 0, 4)).ToLower(); switch (chkid) { case "riff": MasterChunk mc = new MasterChunk(); mc.chkID = new char[] { 'R', 'I', 'F', 'F' }; mc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); mc.WAVEID = BR.ReadChars(4); return mc; case "fact": FactChunk fc = new FactChunk(); fc.chkID = new char[] { 'f', 'a', 'c', 't' }; fc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc.dwSampleLength = BitConverter.ToInt32(BR.ReadBytes(4), 0); return fc; case "data": DataChunk dc = new DataChunk(); dc.chkID = new char[] { 'd', 'a', 't', 'a' }; dc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); if (dc.chksize % 2 == 0) dc.pad = 0; else dc.pad = 1; dc.sampled_data = BR.ReadBytes(dc.chksize); return dc; case "fmt ": FormatChunk fc2 = new FormatChunk(); fc2.chkID = new char[] { 'f', 'm', 't', ' ' }; fc2.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.wFormatTag = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.nChannels = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.nSamplesPerSec = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.nAvgBytesPerSec = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.nBlockAlign = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.wBitsPerSample = BitConverter.ToInt16(BR.ReadBytes(2), 0); if (fc2.wFormatTag != (short)WaveHelper.Format_Code.WAVE_FORMAT_PCM) { fc2.cbSize = BitConverter.ToInt16(BR.ReadBytes(2), 0); } if ((int)fc2.wFormatTag == (int)WaveHelper.Format_Code.WAVE_FORMAT_EXTENSIBLE) { fc2.wValidBitsPerSample = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.dwChannelMask = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.SubFormat = BR.ReadChars(16); } return fc2; default: break; } return null; }
public IChunk ReadNextChunk() { if (BR.BaseStream.Position + 4 >= BR.BaseStream.Length) { BR.BaseStream.Position += 4; return(null); } string chkid = (System.Text.UTF8Encoding.UTF8.GetString(BR.ReadBytes(4), 0, 4)).ToLower(); switch (chkid) { case "riff": MasterChunk mc = new MasterChunk(); mc.chkID = new char[] { 'R', 'I', 'F', 'F' }; mc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); mc.WAVEID = BR.ReadChars(4); return(mc); case "fact": FactChunk fc = new FactChunk(); fc.chkID = new char[] { 'f', 'a', 'c', 't' }; fc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc.dwSampleLength = BitConverter.ToInt32(BR.ReadBytes(4), 0); return(fc); case "data": DataChunk dc = new DataChunk(); dc.chkID = new char[] { 'd', 'a', 't', 'a' }; dc.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); if (dc.chksize % 2 == 0) { dc.pad = 0; } else { dc.pad = 1; } dc.sampled_data = BR.ReadBytes(dc.chksize); return(dc); case "fmt ": FormatChunk fc2 = new FormatChunk(); fc2.chkID = new char[] { 'f', 'm', 't', ' ' }; fc2.chksize = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.wFormatTag = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.nChannels = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.nSamplesPerSec = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.nAvgBytesPerSec = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.nBlockAlign = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.wBitsPerSample = BitConverter.ToInt16(BR.ReadBytes(2), 0); if (fc2.wFormatTag != (short)WaveHelper.Format_Code.WAVE_FORMAT_PCM) { fc2.cbSize = BitConverter.ToInt16(BR.ReadBytes(2), 0); } if ((int)fc2.wFormatTag == (int)WaveHelper.Format_Code.WAVE_FORMAT_EXTENSIBLE) { fc2.wValidBitsPerSample = BitConverter.ToInt16(BR.ReadBytes(2), 0); fc2.dwChannelMask = BitConverter.ToInt32(BR.ReadBytes(4), 0); fc2.SubFormat = BR.ReadChars(16); } return(fc2); default: break; } return(null); }