shithub: opusfile

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Fix timestamp check for seek-free seek.

We avoid seeking when the seek target lies within the packets
 buffered from the current page.
However, the calculation of the page start time was _adding_ the
 first packet's duration to its end time, instead of subtracting
 it.

--- a/src/opusfile.c

+++ b/src/opusfile.c

@@ -2263,7 +2263,7 @@

                generally 1 second or less), we can loop them continuously

                without seeking at all.*/

             OP_ALWAYS_TRUE(!op_granpos_add(&prev_page_gp,_of->op[0].granulepos,

-             op_get_packet_duration(_of->op[0].packet,_of->op[0].bytes)));

+             -op_get_packet_duration(_of->op[0].packet,_of->op[0].bytes)));

             if(op_granpos_cmp(prev_page_gp,_target_gp)<=0){

               /*Don't call op_decode_clear(), because it will dump our

                  packets.*/