Implemented the GetSources() in native code.

webrtc/modules/rtp_rtcp/source/rtp_receiver_unittest.cc

+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <memory>
+
+#include "webrtc/common_types.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_header_parser.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_payload_registry.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_receiver.h"
+#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
+#include "webrtc/modules/rtp_rtcp/source/rtp_receiver_impl.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+

[danilchap, 2017/04/10 12:14:06]

tests, specially with constants, better to place inside unnamed namespace

+const uint32_t kTestRate = 64000u;
+const uint8_t kTestPayload[] = {'t', 'e', 's', 't'};
+const uint8_t kPcmuPayloadType = 96;
+const int64_t kGetSourcesTimeoutMs = 10000;
+const int kSourceListsSize = 20;
+
+class RtpReceiverTest : public ::testing::Test {
+ protected:
+  RtpReceiverTest()
+      : fake_clock_(123456),
+        rtp_receiver_(
+            RtpReceiver::CreateAudioReceiver(&fake_clock_,
+                                             nullptr,
+                                             nullptr,
+                                             &rtp_payload_registry_)) {
+    CodecInst voice_codec = {};
+    voice_codec.pltype = kPcmuPayloadType;
+    voice_codec.plfreq = 8000;
+    voice_codec.rate = kTestRate;
+    memcpy(voice_codec.plname, "PCMU", 5);
+    rtp_receiver_->RegisterReceivePayload(voice_codec);
+  }
+  ~RtpReceiverTest() {}
+
+  bool FindSourceByIdAndType(const std::vector<RtpSource>& sources,
+                             uint32_t source_id,
+                             RtpSourceType type,
+                             RtpSource* source) {
+    for (size_t i = 0; i < sources.size(); ++i) {
+      if (sources[i].source_id() == source_id &&
+          sources[i].source_type() == type) {
+        (*source) = sources[i];
+        return true;
+      }
+    }
+    return false;
+  }
+
+  SimulatedClock fake_clock_;
+  RTPPayloadRegistry rtp_payload_registry_;
+  std::unique_ptr<RtpReceiver> rtp_receiver_;
+};
+
+TEST_F(RtpReceiverTest, GetSources) {
+  RTPHeader header;
+  header.payloadType = kPcmuPayloadType;
+  header.ssrc = 1;

[danilchap, 2017/04/10 12:14:06]

might be better to name all [cs]src constants, specially when the value (1) look
like it might be a size.
const uint32_t kSsrc = 123;
const uint32_t kCsrc1 = 111;
const uint32_t kCsrc2 = 222;
// or const uint32_t kCsrc[] = { 111, 222 };

+  header.timestamp = fake_clock_.TimeInMilliseconds();

[danilchap, 2017/04/10 12:14:06]

it looks wrong to use current_time as rtp timestamp, specially when you have
kTestRate != 1000
may be make a small helper
static uint32_t rtp_timestamp(int64_t time_ms) {
  return static_cast<uint32_t>(time_ms * kTestRate / 1000);
}
or
uint32_t rtp_timestamp_now() const;
(It doesn't cover large values of time_ms, but should be fine for these tests)

+  header.numCSRCs = 2;
+  header.arrOfCSRCs[0] = 111;
+  header.arrOfCSRCs[1] = 222;
+  PayloadUnion payload_specific = {AudioPayload()};
+  bool in_order = false;

[danilchap, 2017/04/10 12:14:06]

may be bool in_order = true; // or better kInOrder = true;
and then, when call IncomingRtpPacket, write !kInOrder

+  RtpSource source(0, 0, RtpSourceType::SSRC);
+
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,

[danilchap, 2017/04/10 12:14:06]

may be sizeof(kTestPayload) instead of 'magic' value 4

+                                               payload_specific, in_order));
+  auto sources = rtp_receiver_->GetSources();
+  // One SSRC source and two CSRC sources.
+  ASSERT_EQ(3u, sources.size());

[danilchap, 2017/04/10 12:14:06]

with gmock and RtpSource::operator== or customer matcher you might write
int64_t now_ms = fake_clock_.TimeInMilliseconds();
EXPECT_THAT(sources, UnorderedElementsAre(
RtpSource(now_ms, kSsrc, RtpSourceType::SSRC),
RtpSource(now_ms, kCsrc1, RtpSourceType::CSRC),
RtpSource(now_ms, kCsrc2, RtpSourceType::CSRC)));
instead of 7 ASSERT/EXPECT

+  ASSERT_TRUE(FindSourceByIdAndType(sources, 1u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 222u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 111u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+
+  // Advance the fake clock and the method is expected to return the
+  // contributing source object with same source id and updated timestamp.
+  fake_clock_.AdvanceTimeMilliseconds(1);
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(3u, sources.size());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 1u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 222u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 111u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(), source.timestamp_ms());
+
+  // Test the edge case that the sources are still there just before the
+  // timeout.
+  int64_t prev_timestamp = fake_clock_.TimeInMilliseconds();
+  fake_clock_.AdvanceTimeMilliseconds(kGetSourcesTimeoutMs);
+  sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(3u, sources.size());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 1u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(prev_timestamp, source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 222u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(prev_timestamp, source.timestamp_ms());
+  ASSERT_TRUE(
+      FindSourceByIdAndType(sources, 111u, RtpSourceType::CSRC, &source));
+  EXPECT_EQ(prev_timestamp, source.timestamp_ms());
+
+  // Time out.
+  fake_clock_.AdvanceTimeMilliseconds(1);
+  sources = rtp_receiver_->GetSources();
+  // All the sources should be out of date.
+  ASSERT_EQ(0u, sources.size());
+}
+
+// Test the case that the SSRC is changed.
+TEST_F(RtpReceiverTest, GetSourcesChangeSSRC) {
+  int64_t prev_time = -1;
+  int64_t cur_time = fake_clock_.TimeInMilliseconds();

[danilchap, 2017/04/10 12:14:07]

now_ms is probably more common name in the codebase.

+  RTPHeader header;
+  header.payloadType = kPcmuPayloadType;
+  header.ssrc = 1;
+  header.timestamp = cur_time;
+  PayloadUnion payload_specific = {AudioPayload()};
+  bool in_order = false;
+  RtpSource source(0, 0, RtpSourceType::SSRC);
+
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  auto sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(1u, sources.size());
+  EXPECT_EQ(1u, sources[0].source_id());
+  EXPECT_EQ(cur_time, sources[0].timestamp_ms());
+
+  // The SSRC is changed and the old SSRC is expected to be returned.
+  fake_clock_.AdvanceTimeMilliseconds(100);
+  prev_time = cur_time;
+  cur_time = fake_clock_.TimeInMilliseconds();
+  header.ssrc = 2;
+  header.timestamp = cur_time;
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(2u, sources.size());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 2u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(cur_time, source.timestamp_ms());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 1u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(prev_time, source.timestamp_ms());
+
+  // The SSRC is changed again and happen to be changed back to 1. No
+  // duplication is expected.
+  fake_clock_.AdvanceTimeMilliseconds(100);
+  header.ssrc = 1;
+  header.timestamp = cur_time;
+  prev_time = cur_time;
+  cur_time = fake_clock_.TimeInMilliseconds();
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(2u, sources.size());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 1u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(cur_time, source.timestamp_ms());
+  ASSERT_TRUE(FindSourceByIdAndType(sources, 2u, RtpSourceType::SSRC, &source));
+  EXPECT_EQ(prev_time, source.timestamp_ms());
+
+  // Old SSRC source timeout.
+  fake_clock_.AdvanceTimeMilliseconds(kGetSourcesTimeoutMs);
+  cur_time = fake_clock_.TimeInMilliseconds();
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  sources = rtp_receiver_->GetSources();
+  ASSERT_EQ(1u, sources.size());
+  EXPECT_EQ(1u, sources[0].source_id());
+  EXPECT_EQ(cur_time, sources[0].timestamp_ms());
+  EXPECT_EQ(RtpSourceType::SSRC, sources[0].source_type());
+}
+
+TEST_F(RtpReceiverTest, GetSourcesRemoveOutdatedSource) {
+  int64_t timestamp = fake_clock_.TimeInMilliseconds();
+  bool in_order = false;
+  RTPHeader header;
+  header.payloadType = kPcmuPayloadType;
+  header.timestamp = timestamp;
+  PayloadUnion payload_specific = {AudioPayload()};
+  header.numCSRCs = 1;
+  RtpSource source(0, 0, RtpSourceType::SSRC);
+
+  for (size_t i = 0; i < kSourceListsSize; ++i) {

[danilchap, 2017/04/10 12:14:06]

any plan to use this constant in another test? if not - define it inside the
test instead of top of the file. (if yes - still might good to define it inside
each test, like you do with in_order flag)

+    header.ssrc = i;
+    header.arrOfCSRCs[0] = (i + 1);

[danilchap, 2017/04/10 12:14:06]

is it intended CSRC is same as SSRC of the next packet?

+    EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                                 payload_specific, in_order));
+  }
+
+  auto sources = rtp_receiver_->GetSources();
+  // Expect |kSourceListsSize| SSRC sources and |kSourceListsSize| CSRC sources.
+  ASSERT_TRUE(sources.size() == 2 * kSourceListsSize);
+  for (size_t i = 0; i < kSourceListsSize; ++i) {
+    // The SSRC source IDs are expected to be 19, 18, 17 ... 0
+    ASSERT_TRUE(
+        FindSourceByIdAndType(sources, i, RtpSourceType::SSRC, &source));
+    EXPECT_EQ(timestamp, source.timestamp_ms());
+
+    // The CSRC source IDs are expected to be 20, 19, 18 ... 1
+    ASSERT_TRUE(
+        FindSourceByIdAndType(sources, (i + 1), RtpSourceType::CSRC, &source));
+    EXPECT_EQ(timestamp, source.timestamp_ms());
+  }
+
+  fake_clock_.AdvanceTimeMilliseconds(kGetSourcesTimeoutMs);
+  for (size_t i = 0; i < kSourceListsSize; ++i) {
+    // The SSRC source IDs are expected to be 19, 18, 17 ... 0
+    ASSERT_TRUE(
+        FindSourceByIdAndType(sources, i, RtpSourceType::SSRC, &source));
+    EXPECT_EQ(timestamp, source.timestamp_ms());
+
+    // The CSRC source IDs are expected to be 20, 19, 18 ... 1
+    ASSERT_TRUE(
+        FindSourceByIdAndType(sources, (i + 1), RtpSourceType::CSRC, &source));
+    EXPECT_EQ(timestamp, source.timestamp_ms());
+  }
+
+  // Timeout. All the existing objects are out of date and are expected to be
+  // removed.
+  fake_clock_.AdvanceTimeMilliseconds(1);
+  header.ssrc = 111;
+  header.arrOfCSRCs[0] = 222;
+  EXPECT_TRUE(rtp_receiver_->IncomingRtpPacket(header, kTestPayload, 4,
+                                               payload_specific, in_order));
+  auto rtp_receiver_impl = static_cast<RtpReceiverImpl*>(rtp_receiver_.get());
+  auto ssrc_sources = rtp_receiver_impl->ssrc_sources_for_testing();
+  ASSERT_EQ(1u, ssrc_sources.size());
+  EXPECT_EQ(111u, ssrc_sources.begin()->source_id());
+  EXPECT_EQ(RtpSourceType::SSRC, ssrc_sources.begin()->source_type());
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(),
+            ssrc_sources.begin()->timestamp_ms());
+
+  auto csrc_sources = rtp_receiver_impl->csrc_sources_for_testing();
+  ASSERT_EQ(1u, csrc_sources.size());
+  EXPECT_EQ(222u, csrc_sources.begin()->source_id());
+  EXPECT_EQ(RtpSourceType::CSRC, csrc_sources.begin()->source_type());
+  EXPECT_EQ(fake_clock_.TimeInMilliseconds(),
+            csrc_sources.begin()->timestamp_ms());
+}
+
+}  // namespace webrtc