public string this[string AttrName]
{
get
{
var head = new WMHeaderInfo(HeaderInfo);
try
{
return(head[AttrName].Value.ToString());
}
catch (COMException e)
{
if (e.ErrorCode == WM.ASF_E_NOTFOUND)
{
return(null);
}
throw;
}
}
}
/// <summary>
/// Create the writer indicating Metadata information
/// </summary>
/// <param name="output"><see cref="System.IO.Stream"/> Where resulting WMA string will be written</param>
/// <param name="format">PCM format of input data received in <see cref="WmaWriter.Write"/> method</param>
/// <param name="profile">IWMProfile that describe the resulting compressed stream</param>
/// <param name="metadataAttributes">Array of <see cref="yeti.wma.structs.WM_Attr"/> structures describing the metadata information that will be in the result stream</param>
public WmaWriter(Stream output, WaveFormat format, IWMProfile profile, IEnumerable <WM_Attr> metadataAttributes)
: base(output, format)
{
m_Writer = WM.CreateWriter();
var wa = (IWMWriterAdvanced)m_Writer;
wa.AddSink((IWMWriterSink)this);
m_Writer.SetProfile(profile);
uint inputs;
m_Writer.GetInputCount(out inputs);
if (inputs == 1)
{
IWMInputMediaProps inpProps;
Guid type;
m_Writer.GetInputProps(0, out inpProps);
inpProps.GetType(out type);
if (type == MediaTypes.WMMEDIATYPE_Audio)
{
WM_MEDIA_TYPE mt;
mt.majortype = MediaTypes.WMMEDIATYPE_Audio;
mt.subtype = MediaTypes.WMMEDIASUBTYPE_PCM;
mt.bFixedSizeSamples = true;
mt.bTemporalCompression = false;
mt.lSampleSize = (uint)m_InputDataFormat.nBlockAlign;
mt.formattype = MediaTypes.WMFORMAT_WaveFormatEx;
mt.pUnk = IntPtr.Zero;
mt.cbFormat = (uint)Marshal.SizeOf(m_InputDataFormat);
GCHandle h = GCHandle.Alloc(m_InputDataFormat, GCHandleType.Pinned);
try
{
mt.pbFormat = h.AddrOfPinnedObject();
inpProps.SetMediaType(ref mt);
}
finally
{
h.Free();
}
m_Writer.SetInputProps(0, inpProps);
if (metadataAttributes != null)
{
var info = new WMHeaderInfo((IWMHeaderInfo)m_Writer);
foreach (WM_Attr attr in metadataAttributes)
{
info.SetAttribute(attr);
}
info = null;
}
m_Writer.BeginWriting();
m_Profile = profile;
}
else
{
throw new ArgumentException("Invalid profile", "profile");
}
}
else
{
throw new ArgumentException("Invalid profile", "profile");
}
}
private void Init(WaveFormat outputFormat)
{
m_OutputNumber = GetAudioOutputNumber(m_Reader);
if (m_OutputNumber == InvalidOuput)
{
throw new ArgumentException("An audio stream was not found");
}
int[] formatIndexes = GetPCMOutputNumbers(m_Reader, (uint)m_OutputNumber);
if (formatIndexes.Length == 0)
{
throw new ArgumentException("An audio stream was not found");
}
if (outputFormat != null)
{
m_OutputFormatNumber = -1;
for (int i = 0; i < formatIndexes.Length; i++)
{
WaveFormat fmt = GetOutputFormat(m_Reader, (uint)m_OutputNumber, (uint)formatIndexes[i]);
if ((fmt.wFormatTag == outputFormat.wFormatTag) &&
(fmt.nAvgBytesPerSec == outputFormat.nAvgBytesPerSec) &&
(fmt.nBlockAlign == outputFormat.nBlockAlign) &&
(fmt.nChannels == outputFormat.nChannels) &&
(fmt.nSamplesPerSec == outputFormat.nSamplesPerSec) &&
(fmt.wBitsPerSample == outputFormat.wBitsPerSample))
{
m_OutputFormatNumber = formatIndexes[i];
m_OutputFormat = fmt;
break;
}
}
if (m_OutputFormatNumber < 0)
{
throw new ArgumentException("No PCM output found");
}
}
else
{
m_OutputFormatNumber = formatIndexes[0];
m_OutputFormat = GetOutputFormat(m_Reader, (uint)m_OutputNumber, (uint)formatIndexes[0]);
}
uint outputCtns = 0;
m_Reader.GetOutputCount(out outputCtns);
var streamNumbers = new ushort[outputCtns];
var streamSelections = new WMT_STREAM_SELECTION[outputCtns];
for (uint i = 0; i < outputCtns; i++)
{
m_Reader.GetStreamNumberForOutput(i, out streamNumbers[i]);
if (i == m_OutputNumber)
{
streamSelections[i] = WMT_STREAM_SELECTION.WMT_ON;
m_OuputStream = streamNumbers[i];
m_Reader.SetReadStreamSamples(m_OuputStream, false);
}
else
{
streamSelections[i] = WMT_STREAM_SELECTION.WMT_OFF;
}
}
m_Reader.SetStreamsSelected((ushort)outputCtns, streamNumbers, streamSelections);
IWMOutputMediaProps props = null;
m_Reader.GetOutputFormat((uint)m_OutputNumber, (uint)m_OutputFormatNumber, out props);
m_Reader.SetOutputProps((uint)m_OutputNumber, props);
uint size = 0;
props.GetMediaType(IntPtr.Zero, ref size);
IntPtr buffer = Marshal.AllocCoTaskMem((int)size);
try
{
props.GetMediaType(buffer, ref size);
var mt = (WM_MEDIA_TYPE)Marshal.PtrToStructure(buffer, typeof(WM_MEDIA_TYPE));
m_SampleSize = mt.lSampleSize;
}
finally
{
Marshal.FreeCoTaskMem(buffer);
props = null;
}
m_Seekable = false;
m_Length = -1;
var head = new WMHeaderInfo(HeaderInfo);
try
{
m_Seekable = (bool)head[WM.g_wszWMSeekable];
m_Length = SampleTime2BytePosition((ulong)head[WM.g_wszWMDuration]);
}
catch (COMException e)
{
if (e.ErrorCode != WM.ASF_E_NOTFOUND)
{
throw;
}
}
}
