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Subject: RE: how to merge fixed point wma decoder to libav 0.7.6

RE: how to merge fixed point wma decoder to libav 0.7.6

From: Mike <giac2000_at_hotmail.com>
Date: Fri, 12 Sep 2014 08:49:48 -0700

That means you passed a bad pointer most likely. Check that everything is passed correctly and that you aren't calling the ffmpeg version of that function.

Date: Fri, 12 Sep 2014 11:32:25 +0800
Subject: Re: how to merge fixed point wma decoder to libav 0.7.6
From: soho123.2012_at_gmail.com
To: rockbox-dev_at_cool.haxx.se

Hi Mike,
Thanks a lot for your input!!I have merge the code into ffmpeg libavcodec, and the flow is refered from wma.c that you mentioned.but I got a problem.the function ff_imdct_calc cause SIGSEGV error (memory access error in linux )when decode audio data , do you have any idea?
2014-09-12 3:29 GMT+08:00 Mike <giac2000_at_hotmail.com>:

Could you explain more detail about your idea?since I have question about how to decode wma file.the container used for wma file is ASF, how to demux asf in Rockbox?the data that read by asf_read_packet (to read an ASF packet) can be put into decode ,right?that does not include container data?Could you kindly give the hints?

You can demux an ASF packet by calling asf_read_packet, which will give you (IIRC) enough compressed data to decode at least one superframe.
If you haven't already, take a look at wma.c. I didn't write most of that code, but the logic looks fairly clear (call asf_read_packet, pass data to the decoder, repeat until out of data).
Mike

                                               
Received on 2014-09-12


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