It happens when the number of channels defined by DCAContext:acmod is lower
than DCAContext:prim_channels. In this case, dca_subsubframe() will call
qmf_32_subbands() using s->channel_order_tab[] entries equal to -1.
Originally committed as revision 22083 to svn://svn.ffmpeg.org/ffmpeg/trunk
} else
s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];
+ if (s->prim_channels > 0 &&
+ s->channel_order_tab[s->prim_channels - 1] < 0)
+ return -1;
+
if(avctx->request_channels == 2 && s->prim_channels > 2) {
channels = 2;
s->output = DCA_STEREO;