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Fix a case in get_event_start_packet_it where if no pre_event_count we log an error and maybe don't start on a keyframe

This commit is contained in:
Isaac Connor 2021-05-07 09:10:26 -04:00
parent 4ea48708ed
commit 43f2f195f1
1 changed files with 24 additions and 32 deletions
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20
src/zm_packetqueue.cpp
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@ -645,7 +645,8 @@ packetqueue_iterator *PacketQueue::get_event_start_packet_it(
// Step one count back pre_event_count frames as the minimum
// Do not assume that snapshot_it is video
// snapshot it might already point to the beginning
while (( (*it) != pktQueue.begin() ) and pre_event_count) {
if (pre_event_count) {
while ((*it) != pktQueue.begin()) {
packet = *(*it);
Debug(1, "Previous packet pre_event_count %d stream_index %d keyframe %d score %d",
pre_event_count, packet->packet.stream_index, packet->keyframe, packet->score);
@ -657,13 +658,10 @@ packetqueue_iterator *PacketQueue::get_event_start_packet_it(
}
(*it)--;
}
}
// it either points to beginning or we have seen pre_event_count video packets.
if ((*it) == pktQueue.begin()) {
packet = *(*it);
Debug(1, "Hit begin");
// hit end, the first packet in the queue should ALWAYS be a video keyframe.
// So we should be able to return it.
if (pre_event_count) {
if (packet->image_index < (int)pre_event_count) {
// probably just starting up
@ -672,24 +670,18 @@ packetqueue_iterator *PacketQueue::get_event_start_packet_it(
Warning("Hit end of packetqueue before satisfying pre_event_count. Needed %d more video frames", pre_event_count);
}
ZM_DUMP_PACKET(packet->packet, "");
}
return it;
}
// Not at beginning, so must be pointing at a video keyframe or maybe pre_event_count == 0
if (packet->keyframe) {
ZM_DUMP_PACKET(packet->packet, "Found video keyframe, Returning");
return it;
}
while (--(*it) != pktQueue.begin()) {
while ((*it) != pktQueue.begin()) {
packet = *(*it);
ZM_DUMP_PACKET(packet->packet, "No keyframe");
if ((packet->packet.stream_index == video_stream_id) and packet->keyframe)
return it; // Success
--(*it);
}
if (!(*(*it))->keyframe) {
Warning("Hit end of packetqueue before satisfying pre_event_count. Needed %d more video frames", pre_event_count);
Warning("Hit beginning of packetqueue and packet is not a keyframe. index is %d", packet->image_index);
}
return it;
} // end packetqueue_iterator *PacketQueue::get_event_start_packet_it