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Reduce to 2 probes when probing for initial bandwidth.

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BUG=
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/23359005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7621 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
stefan@webrtc.org
2014-11-04 19:33:55 +00:00
parent db26247a9b
commit d839e0ab52
3 changed files with 14 additions and 17 deletions
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10
webrtc/modules/pacing/bitrate_prober.cc
View File

@@ -55,16 +55,18 @@ void BitrateProber::MaybeInitializeProbe(int bitrate_bps) {
return;
probe_bitrates_.clear();
// Max number of packets used for probing.
const int kMaxProbeLength = 15;
const int kMaxNumProbes = 3;
const int kPacketsPerProbe = kMaxProbeLength / kMaxNumProbes;
const float kProbeBitrateMultipliers[kMaxNumProbes] = {2.5, 4, 6};
const int kMaxNumProbes = 2;
const int kPacketsPerProbe = 5;
const float kProbeBitrateMultipliers[kMaxNumProbes] = {3, 6};
int bitrates_bps[kMaxNumProbes];
std::stringstream bitrate_log;
bitrate_log << "Start probing for bandwidth, bitrates:";
for (int i = 0; i < kMaxNumProbes; ++i) {
bitrates_bps[i] = kProbeBitrateMultipliers[i] * bitrate_bps;
bitrate_log << " " << bitrates_bps[i];
// We need one extra to get 5 deltas for the first probe.
if (i == 0)
probe_bitrates_.push_back(bitrates_bps[i]);
for (int j = 0; j < kPacketsPerProbe; ++j)
probe_bitrates_.push_back(bitrates_bps[i]);
}

14
webrtc/modules/pacing/bitrate_prober_unittest.cc
View File

@@ -30,17 +30,11 @@ TEST(BitrateProberTest, VerifyStatesAndTimeBetweenProbes) {
EXPECT_EQ(0, prober.TimeUntilNextProbe(now_ms));
prober.PacketSent(now_ms, 1000);
for (int i = 0; i < 4; ++i) {
EXPECT_EQ(10, prober.TimeUntilNextProbe(now_ms));
now_ms += 5;
EXPECT_EQ(5, prober.TimeUntilNextProbe(now_ms));
now_ms += 5;
EXPECT_EQ(0, prober.TimeUntilNextProbe(now_ms));
prober.PacketSent(now_ms, 1000);
}
for (int i = 0; i < 5; ++i) {
EXPECT_EQ(6, prober.TimeUntilNextProbe(now_ms));
now_ms += 6;
EXPECT_EQ(8, prober.TimeUntilNextProbe(now_ms));
now_ms += 4;
EXPECT_EQ(4, prober.TimeUntilNextProbe(now_ms));
now_ms += 4;
EXPECT_EQ(0, prober.TimeUntilNextProbe(now_ms));
prober.PacketSent(now_ms, 1000);
}

7
webrtc/modules/pacing/paced_sender_unittest.cc
View File

@@ -711,13 +711,14 @@ class ProbingPacedSender : public PacedSender {
};
TEST_F(PacedSenderTest, ProbingWithInitialFrame) {
const int kNumPackets = 15;
const int kNumPackets = 11;
const int kNumDeltas = kNumPackets - 1;
const int kPacketSize = 1200;
const int kInitialBitrateKbps = 300;
uint32_t ssrc = 12346;
uint16_t sequence_number = 1234;
const int expected_deltas[kNumPackets - 1] = {
12, 12, 12, 12, 8, 8, 8, 8, 8, 5, 5, 5, 5, 5};
const int expected_deltas[kNumDeltas] = {
10, 10, 10, 10, 10, 5, 5, 5, 5, 5};
std::list<int> expected_deltas_list(expected_deltas,
expected_deltas + kNumPackets - 1);
PacedSenderProbing callback(expected_deltas_list, &clock_);