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NetEq: Rectify the implementation of PacketBuffer::DiscardOldPackets

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The implementation of this method did not follow the description in
the method comment. It was supposed to delete all packets in a range
[A, B], but if at least one packet in the buffer had a timestamp lower
than A, then no packets at all were discarded. This is now fixed.

BUG=webrtc:7937

Review-Url: https://codereview.webrtc.org/2969123003
Cr-Commit-Position: refs/heads/master@{#18903}
This commit is contained in:
henrik.lundin
2017-07-05 07:03:34 -07:00
committed by Commit Bot
parent 440ea8cdff
commit 63d146b743
2 changed files with 27 additions and 13 deletions
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16
webrtc/modules/audio_coding/neteq/packet_buffer.cc
View File

@ -221,15 +221,13 @@ int PacketBuffer::DiscardNextPacket(StatisticsCalculator* stats) {
void PacketBuffer::DiscardOldPackets(uint32_t timestamp_limit,
uint32_t horizon_samples,
StatisticsCalculator* stats) {
// TODO(minyue): the following implementation is wrong. It won't discard
// old packets if the buffer_.front() is newer than timestamp_limit -
// horizon_samples. https://bugs.chromium.org/p/webrtc/issues/detail?id=7937
while (!Empty() && timestamp_limit != buffer_.front().timestamp &&
IsObsoleteTimestamp(buffer_.front().timestamp, timestamp_limit,
horizon_samples)) {
if (DiscardNextPacket(stats) != kOK) {
assert(false); // Must be ok by design.
}
const size_t old_size = buffer_.size();
buffer_.remove_if([timestamp_limit, horizon_samples](const Packet& p) {
return timestamp_limit != p.timestamp &&
IsObsoleteTimestamp(p.timestamp, timestamp_limit, horizon_samples);
});
if (old_size > buffer_.size()) {
stats->PacketsDiscarded(old_size - buffer_.size());
}
}

24
webrtc/modules/audio_coding/neteq/packet_buffer_unittest.cc
View File

@ -22,6 +22,8 @@
using ::testing::Return;
using ::testing::StrictMock;
using ::testing::_;
using ::testing::InSequence;
using ::testing::MockFunction;
namespace webrtc {
@ -314,26 +316,40 @@ TEST(PacketBuffer, DiscardPackets) {
// Discard them one by one and make sure that the right packets are at the
// front of the buffer.
constexpr int kDiscardPackets = 5;
// Interleaving the EXPECT_CALL sequence with expectations on the MockFunction
// check ensures that exactly one call to PacketsDiscarded happens in each
// DiscardNextPacket call.
InSequence s;
MockFunction<void(int check_point_id)> check;
for (int i = 0; i < kDiscardPackets; ++i) {
uint32_t ts;
EXPECT_EQ(PacketBuffer::kOK, buffer.NextTimestamp(&ts));
EXPECT_EQ(current_ts, ts);
EXPECT_CALL(mock_stats, PacketsDiscarded(1)).Times(1);
EXPECT_CALL(mock_stats, PacketsDiscarded(1));
EXPECT_CALL(check, Call(i));
EXPECT_EQ(PacketBuffer::kOK, buffer.DiscardNextPacket(&mock_stats));
current_ts += ts_increment;
check.Call(i);
}
constexpr int kRemainingPackets = kTotalPackets - kDiscardPackets;
// This will not discard any packets because the oldest packet is newer than
// the indicated horizon_samples.
// This will discard all remaining packets but one. The oldest packet is older
// than the indicated horizon_samples, and will thus be left in the buffer.
constexpr size_t kSkipPackets = 1;
EXPECT_CALL(mock_stats, PacketsDiscarded(kRemainingPackets - kSkipPackets));
EXPECT_CALL(check, Call(17)); // Arbitrary id number.
buffer.DiscardOldPackets(start_ts + kTotalPackets * ts_increment,
kRemainingPackets * ts_increment, &mock_stats);
check.Call(17); // Same arbitrary id number.
EXPECT_EQ(kSkipPackets, buffer.NumPacketsInBuffer());
uint32_t ts;
EXPECT_EQ(PacketBuffer::kOK, buffer.NextTimestamp(&ts));
EXPECT_EQ(current_ts, ts);
// Discard all remaining packets.
EXPECT_CALL(mock_stats, PacketsDiscarded(1)).Times(kRemainingPackets);
EXPECT_CALL(mock_stats, PacketsDiscarded(kSkipPackets));
buffer.DiscardAllOldPackets(start_ts + kTotalPackets * ts_increment,
&mock_stats);