mad-user July 2005

mad-user@lists.mars.org

1 participants
2 discussions

Where the hell is definition of struct id3_file????
by tj 29 Sep '06

29 Sep '06

In trying to learn how to use libid3, since there sems to be no documentatio. I am looking at soure trying to figure out how to use it. The first problem is the practically every call uses a pointer to a "struct id3_file" . Now, the problem is that there is no definition for id3_file structure in any .h file. I finally found it in file.c, a source file. How the hell are you supposed to use it in your app when the prototype is in a package source file? Seems that something is really broken here. tj

3 4

Decoding and playing MP3 while doing something else
by Jeroen Taverne 02 Jul '05

02 Jul '05

Hi. I am implementing a very simple MP3 player on an ARM architecture using a CF harddisk. To safe power I am reading as much data as possible in one time from the harddisk, so it will goto standby mode. What I would like to do is this: Load as much possible MP3 data from multiple files in a 24MB cyclic buffer. Start decoding and playing. Playing is done using double buffered DMA. When 16MB of data is decoded and played, 16MB is read again from harddisk, overwriting the decoded and played data. During loading of these 16MB the decoding and playing continues of the 8MB that's still in the cyclic buffer. This is repeated all the time. I can't use MAD's SYNC mode for this, because the decoder "hangs" and at some time the buffer is empty. I don't want to use multi threading, as I don't have an OS at all. So maybe I have to use ASYNC mode??? Then the decoder directly returns, so I can do some other things like disk reading while decoding. But I can't find any simple example how to use ASYNC mode. When the decoder return I need some way to "kick" the decoder again, so it does a little decoding and then returns again. I don't know how the messaging system works of MAD in ASYNC mode. Does someone have a simple example for me? Best regards, Jeroen

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mad-user July 2005