Hello,

I have try to compile the last version of this program and run on the arm7 with cpu speed is 74MHz, os is ArmLinux. With arm-asm code used, the program is using 25secs to decode a 10secs mp3 bitstream where 192kbps, 44.1kHz. Using approx 32bits code, the program is using 18secs to decode that 10secs mp3 bitstream. The mad cannot reach to realtime decoding at this cpu. I have already turn on all optimize choices.

I have used same arm7 cpu and ran circuit logic mp3 decoder demo to decode some mp3 bitstreams in 128kbps, 44.1kHz. This mp3 program does not need ArmLinux, it run as standalone. The audio playback work very well. I do not know that mp3 program whether possible decoding realtime at 29MHz.

Do anyone know why ? ArmLinux eat some resources ? Or some compiler tricks I need to add to speed up the program. As I know, Arm7 has 3 pipeline for processing instruction. Does normal compile not take all advantange of this CPU's structure.

Regards, lwong.

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