Making the demos/DVTB work with custom combos
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Introduction
Problem Statement : let's say you only need a video codecs combo i.e. you don't care about audio, speech or imaging. You'd like to validate your combo with the DVEVM demos or DVTB. You've built your combo and updated your GPP cfg file to point to the new combo as follows: -
var engine = Engine.createFromServer(
"decode",
"./mpeg4dec_unitserver_evm3530.x64P",
"ti.sdo.servers.mpeg4dec_unitserver_evm3530"
);
You can tell from the name that this is a "unit server" i.e. MPEG4 decode only in the combo/server.
Now you try to build the demos. Suddenly you hit something like this!
Linking decode from audio.o ctrl.o display.o loader.o main.o video.o ../keypad.o ../uibuttons.o ../ui.o decode_config/linker.cmd.. /opt/dmsw/dvsdk_3_00_00_13/dmai_1_20_00_00/packages/ti/sdo/dmai/lib/dmai_linux_omap3530.a470MV(Adec1.o3530.o470MV): In function `cleanup': /db/rtree/niclas/davinci_multimedia_application_interface/dmai/packages/ti/sdo/dmai/ce/Adec1.c:52: undefined reference to `AUDDEC1_delete'
What now?
Linking in the right libraries
The DVSDK demos for most platforms support audio+video or speech+audio+video. In this case the error message indicates that a call to the VISA API AUDDEC1_delete is being done, but the library that supplies it is not linked in.
Typically this is resolved by the combo having audio + video, in which case a reference to the underlying audio & video libraries gets linked in. For example in the build you'll see: -
will link with ti.sdo.ce.video2:lib/viddec2.a470MV
Without an audio codec in the combo, the demos / DVTB build fails.
Solution
To resolve this, simply add the following in the demos/DVTB cfg file: -
/* link in VISA classes */
xdc.loadPackage("ti.sdo.ce.audio1");
The loadPackage method will unconditionally link in the right library content for the ti.sdo.ce.audio1 package. In this case it results in a linkage of: -
will link with ti.sdo.ce.audio1:lib/auddec1.a470MV;lib/audenc1.a470MV
Naturally if you see errors with undefined references to e.g. SPHDEC1_delete, you can apply the same principle and load in the ti.sdo.ce.speech1 package.
