+ discard_padding = avctx->frame_size - avpkt->duration;
+ // Check if subtraction resulted in an overflow
+ if ((discard_padding < avctx->frame_size) != (avpkt->duration > 0)) {
+ av_log(avctx, AV_LOG_ERROR, "discard padding overflow\n");
+ av_packet_unref(avpkt);
+ av_free(avpkt);
+ return AVERROR(EINVAL);
+ }
+ if ((!s->delay_sent && avctx->initial_padding > 0) || discard_padding > 0) {
+ uint8_t* side_data = av_packet_new_side_data(avpkt,
+ AV_PKT_DATA_SKIP_SAMPLES,
+ 10);
+ if(!side_data) {
+ av_packet_unref(avpkt);
+ av_free(avpkt);
+ return AVERROR(ENOMEM);
+ }
+ if (!s->delay_sent) {
+ AV_WL32(side_data, avctx->initial_padding);
+ s->delay_sent = 1;
+ }
+ AV_WL32(side_data + 4, discard_padding);
+ }
+