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Don't clear newer packets from the video_coding::PacketBuffer when calling ClearTo.

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BUG=webrtc:8060

Review-Url: https://codereview.webrtc.org/2987013002
Cr-Commit-Position: refs/heads/master@{#19212}
This commit is contained in:
philipel
2017-08-02 04:28:57 -07:00
committed by Commit Bot
parent c18f1d7c94
commit c5fb4683e5
2 changed files with 46 additions and 5 deletions
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27
webrtc/modules/video_coding/packet_buffer.cc
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@ -127,20 +127,37 @@ bool PacketBuffer::InsertPacket(VCMPacket* packet) {
void PacketBuffer::ClearTo(uint16_t seq_num) {
rtc::CritScope lock(&crit_);
// We have already cleared past this sequence number, no need to do anything.
if (is_cleared_to_first_seq_num_ &&
AheadOf<uint16_t>(first_seq_num_, seq_num)) {
return;
}
// If the packet buffer was cleared between a frame was created and returned.
if (!first_packet_received_)
return;
is_cleared_to_first_seq_num_ = true;
while (AheadOrAt<uint16_t>(seq_num, first_seq_num_)) {
// Avoid iterating over the buffer more than once by capping the number of
// iterations to the |size_| of the buffer.
++seq_num;
size_t diff = ForwardDiff<uint16_t>(first_seq_num_, seq_num);
size_t iterations = std::min(diff, size_);
for (size_t i = 0; i < iterations; ++i) {
size_t index = first_seq_num_ % size_;
delete[] data_buffer_[index].dataPtr;
data_buffer_[index].dataPtr = nullptr;
sequence_buffer_[index].used = false;
RTC_DCHECK_EQ(data_buffer_[index].seqNum, sequence_buffer_[index].seq_num);
if (AheadOf<uint16_t>(seq_num, sequence_buffer_[index].seq_num)) {
delete[] data_buffer_[index].dataPtr;
data_buffer_[index].dataPtr = nullptr;
sequence_buffer_[index].used = false;
}
++first_seq_num_;
}
// If |diff| is larger than |iterations| it means that we don't increment
// |first_seq_num_| until we reach |seq_num|, so we set it here.
first_seq_num_ = seq_num;
is_cleared_to_first_seq_num_ = true;
missing_packets_.erase(missing_packets_.begin(),
missing_packets_.upper_bound(seq_num));
}