Support and General Use > Hardware
why porting ? kinda waste of time and just have fun only
powerpan:
--- Quote from: saratoga on September 12, 2013, 02:46:56 AM ---
--- Quote from: powerpan on September 12, 2013, 02:12:01 AM ---
--- Quote from: saratoga on September 11, 2013, 11:04:18 PM ---
--- Quote from: powerpan on September 11, 2013, 10:49:34 PM ---but don't know why rockbox codec always missing LSBs
when our player plays DSD, it use 32bits output for DSD64/DSD128 playback
--- End quote ---
Which codec are you referring to? Most of our decoders use 32 bit output and then truncate to 16 bit in the driver for efficiency reasons.
--- End quote ---
most lossless codec like flac/ape/wavpack, including wav
and WAV's id3v2 doesn't support unicode
--- End quote ---
You mean they don't decode or they decode with lower precision?
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DSP_SET_SAMPLE_DEPTH in codec, like flac will return 29bits only. where is the 3 bits? who knows...
anyway, hardware is like a piece of cake. depends how you think of rockbox, let it be or make it a "finished" product.
saratoga:
Ah yes, that makes sense. These are 32 bit processors. Returning 32 bits without rounding would require 64 bit operations, which are extremely expensive on portable devices. And there is little point since you cannot make actual audio with > 24 bits of precision anyway.
powerpan:
--- Quote from: saratoga on September 12, 2013, 12:51:05 PM ---Ah yes, that makes sense. These are 32 bit processors. Returning 32 bits without rounding would require 64 bit operations, which are extremely expensive on portable devices. And there is little point since you cannot make actual audio with > 24 bits of precision anyway.
--- End quote ---
no need to round in fact, why for wav? flac doesn't need rounding....
saratoga:
The WAV decoder doesn't round as far as I know, but the DSP engine will have to since it operates at 32 bit precision.
powerpan:
but when we chase the bit depth, it does output 29bits instead of 32bits
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