Handful of sequence data contains incorrect values when loading the saved project

Hi people!


I ran into a problem where my values of sequence data are not correct when you open a project with an instance of my effect plugin.

The values look good if I manually inspect when they are flattened and written in a fine when handle memory and restore AE sends PF_Cmd_SEQUENCE_RESETUP once the backup is complete.  But when I open / load the saved project, the values are not correct.  In other words, my logic flattening/unflattening works within the same session, but during the loading of a saved project, the flattened data is incomplete or has bad values.

I write several objects to the handful of flat sequence data, and I was wondering if this could be the cause.

The flattened sequence data manage memory looks like this:

[[type struct A] [type struct b] [b] of type struct] [struct type b] <.. .arbitrary number of struct type BS... >]

NB of struct type B varies, so when I ask AE for a handle of memory, I have this:

size_t flatSequenceDataSize = sizeof(structTypeA) + (sizeof(structTypeB)* numberOfBStructsNeeded);
PF_Handle flat_seq_dataH = suites.HandleSuite1()->host_new_handle(flatSequenceDataSize);

Then, to write the data to the handle:

structTypeA myDataA = <... populate struct values ...>
std::vector<structTypeB> allStructB_V;
<... populate vector ...>

void *flat_seq_dataP = suites.HandleSuite1()->host_lock_handle(flat_seq_dataH);

structTypeA *structA_P = reinterpret_cast<structTypeA*>(flat_seq_dataP);
memcpy(flat_seq_dataP, &myDataA, sizeof(structTypeA));

structTypeB *structB_P = reinterpret_cast<structTypeB*>(flat_seq_dataP);

//offset pointer by the size of the first struct in the handle
structB_P += sizeof(structTypeA);

for (A_long vectorIndex=0; vectorIndex < allStructB_V.size(); vectorIndex++) {
    *structB_P = allStructB_V.at(vectorIndex);
    structB_P+= sizeof(structTypeB);
}

out_data->sequence_data = flat_seq_dataH;
suites.HandleSuite1()->host_unlock_handle(flat_seq_dataH);

When I access the handful of sequence data loading stage, the first struct in the flattened handle has correct values, but all following structs have false values.  I check if the handle is always the right size (I save the size of the handle inside the first structure) and it is indeed the correct size.  I wonder if AE doesn't like how I write from the structB to the handle.

I'm doing something wrong here?  Is there a better way to store data of arbitrary sizes?

Thanks for your help!

-Andy

Ah, I missed actually a significant error in your pointer arithmetic! You're actually in the land of UB ("undefined behavior") with your code!

You add byte offsets to a pointer type, which is doomed to failure if you don't know what you're doing.

If you have

structTypeB * structB_P = reinterpret_cast(flat_seq_dataP);

and do you

structB_P += sizeof (structTypeA);

most of compiler that turn into something like this:

structB_P = (structTypeB *) ((unsigned char*) + sizeof (structTypeA) * sizeof (structTypeB));

Wrong in your case (in most cases actually).

Or more simple put:

If you have a pointer

structTypeB * structB_P =...

and you do:

structB_P += 3;

It actually means

structB_P = strucB_P + 3 * sizeof (structTypeB);

already!

Try running your pointer to an unsigned char * or another type of 1 byte basis and then make the increment, and then recast.

Here's a site with more information on this:

http://StackOverflow.com/questions/15934111/portable-and-safe-way-to-add-byte-offset-to-an y-pointer

It could then look like this (on the top of my head, did not check!):

void * flat_seq_dataP = suites. HandleSuite1()-> host_lock_handle (flat_seq_dataH);

structTypeA * structA_P = reinterpret_cast(flat_seq_dataP);

memcpy (myDataA, sizeof (structTypeA) & flat_seq_dataP);

structTypeB * structB_P = reinterpret_cast(reinterpret_cast(flat_seq_dataP) + sizeof (structTypeA));

memcpy (structB_P, allStructB_V.data (), sizeof (structTypeB) * allStructB_V.size ());

out_data-> sequence_data = flat_seq_dataH;

Suites. HandleSuite1()-> host_unlock_handle (flat_seq_dataH);

Tags: After Effects

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