How to insert png to pdf?

I have readed the pdf reference 1.6,i want to insert png to pdf.
i konw that the png consits of alpha and RGB,
31 0 obj
<</BitsPerComponent 8/ColorSpace/DeviceRGB/Filter/DCTDecode/Height 154/Length 8781/Name/X/SMask 30 0 R/Subtype/Image/Type/XObject/Width 154>>stream
I know that 30 0 obj is alpha data after encompressed,buf i don't  konw the stream object in 31 0 obj, how to get the stream data from png?

I have get the alpha piexels and raw pixel(RGB) using the libpng to decode png format, but i don't know that what's  the content of 31 0 obj stream.
I use the adobe acrobat to insert a png to pdf.
the result:
24 0 obj
<</Contents 43 0 R/CropBox[0.0 0.0 612.0 792.0]/Group 39 0 R/ID 40 0 R/MediaBox[0.0 0.0 612.0 792.0]/PZ 1.0/Parent 14 0 R/Resources<</ColorSpace<</CS0 33 0 R>>/Font<</C0_0 38 0 R>>/ProcSet[/PDF/Text/ImageC]/XObject<</Im0 44 0 R>>>>/Rotate 0/Type/Page>>
44 0 obj
<</BitsPerComponent 8/ColorSpace/DeviceRGB/Filter/DCTDecode/Height 154/Length 8792/Name/X/SMask 45 0 R/Subtype/Image/Type/XObject/Width 154>>stream
endstream
45 0 obj
<</BitsPerComponent 8/ColorSpace/DeviceGray/Filter/FlateDecode/Height 154/Length 6157/Name/X/Subtype/Image/Type/XObject/Width 154>>stream
endstream
I know that the stream data of 45 0 obj is alpha data  after compressed,but i don't know what's format the stream data of 44 0 obj  and how to get it from a png.

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