The ltmmPlay_Source constants define the streams that have or haven't been rendered.
typedef enum ltmmPlay_Stream
{
ltmmPlay_Stream_Audio = 0x0001,
ltmmPlay_Stream_Video = 0x0002,
ltmmPlay_Stream_CC = 0x0004,
ltmmPlay_Stream_Midi = 0x0008,
ltmmPlay_Stream_Other = 0x0010,
ltmmPlay_Stream_KLV = 0x0020,
ltmmPlay_Stream_Script = 0x40,
ltmmPlay_Stream_Subtitle = 0x80
} ltmmPlay_Stream;
[0x0001] Audio stream.
[0x0002] Video stream.
[0x0004] Close caption stream.
[0x0008] Midi stream.
[0x0010] Undefined stream.
[0x0020] KLV stream.
[0x0040] Script stream.
[0x0080] Subtitle stream.
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