Access unit queue for MediaCodecPlayer

media/base/android/access_unit_queue_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/base/android/access_unit_queue.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#define ARRAY_SIZE(x) ((sizeof(x) / sizeof(x[0])))
+
+namespace media {
+
+class AccessUnitQueueTest : public testing::Test {
+ public:
+  AccessUnitQueueTest() {}
+  ~AccessUnitQueueTest() override {}
+
+ protected:
+  enum UnitType { kNormal = 0, kKeyFrame, kEOS, kConfig };
+  struct AUDescriptor {
+    UnitType unit_type;
+    std::string data;
+  };
+
+  DemuxerData CreateDemuxerData(const AUDescriptor* descr, int descr_length);
+};
+
+DemuxerData AccessUnitQueueTest::CreateDemuxerData(const AUDescriptor* descr,
+                                                   int descr_length) {
+  DemuxerData result;
+  result.type = DemuxerStream::AUDIO;  // assign a valid type
+
+  for (int i = 0; i < descr_length; ++i) {
+    result.access_units.push_back(AccessUnit());
+    AccessUnit& au = result.access_units.back();
+
+    if (descr[i].unit_type == kConfig) {
+      au.status = DemuxerStream::kConfigChanged;
+      result.demuxer_configs.push_back(DemuxerConfigs());
+      // ignore data
+      continue;
+    }
+
+    au.status = DemuxerStream::kOk;
+
+    if (descr[i].unit_type == kEOS) {
+      au.is_end_of_stream = true;
+      // ignore data
+      continue;
+    }
+
+    au.data = std::vector<uint8>(descr[i].data.begin(), descr[i].data.end());
+
+    if (descr[i].unit_type == kKeyFrame)
+      au.is_key_frame = true;
+  }
+  return result;
+}
+
+#define VERIFY_FIRST_BYTE(expected, info)          \
+  do {                                             \
+    EXPECT_NE(nullptr, info.front_unit);           \
+    EXPECT_TRUE(info.front_unit->data.size() > 0); \
+    EXPECT_EQ(expected, info.front_unit->data[0]); \
+  } while (0)
+
+TEST_F(AccessUnitQueueTest, InitializedEmpty) {
+  AccessUnitQueue au_queue;
+  AccessUnitQueue::Info info = au_queue.GetInfo();
+
+  EXPECT_EQ(0, info.length);
+  EXPECT_FALSE(info.has_eos);
+  EXPECT_EQ(nullptr, info.front_unit);
+  EXPECT_EQ(nullptr, info.configs);
+}
+
+TEST_F(AccessUnitQueueTest, RewindToLastKeyFrameEmptyQueue) {
+  AccessUnitQueue au_queue;
+  EXPECT_FALSE(au_queue.RewindToLastKeyFrame());
+}
+
+TEST_F(AccessUnitQueueTest, PushAndAdvance) {
+  AUDescriptor chunk1[] = {{kNormal, "0"},
+                           {kNormal, "1"},
+                           {kNormal, "2"},
+                           {kNormal, "3"},
+                           {kNormal, "4"},
+                           {kNormal, "5"}};
+  AUDescriptor chunk2[] = {{kNormal, "6"},
+                           {kNormal, "7"},
+                           {kNormal, "8"}};
+
+  int total_size = ARRAY_SIZE(chunk1) + ARRAY_SIZE(chunk2);
+
+  AccessUnitQueue au_queue;
+  au_queue.PushBack(CreateDemuxerData(chunk1, ARRAY_SIZE(chunk1)));
+  au_queue.PushBack(CreateDemuxerData(chunk2, ARRAY_SIZE(chunk2)));
+
+  AccessUnitQueue::Info info;
+  for (int i = 0; i < total_size; ++i) {
+    info = au_queue.GetInfo();
+
+    EXPECT_FALSE(info.has_eos);
+    EXPECT_EQ(total_size - i, info.length);
+    EXPECT_EQ(nullptr, info.configs);
+
+    EXPECT_NE(nullptr, info.front_unit);
+    EXPECT_TRUE(info.front_unit->data.size() > 0);
+    EXPECT_EQ('0' + i, info.front_unit->data[0]);
+
+    au_queue.Advance();
+  }
+
+  // After we advanced past the last AU, GetInfo() should report starvation.
+  info = au_queue.GetInfo();
+
+  EXPECT_EQ(0, info.length);
+  EXPECT_FALSE(info.has_eos);
+  EXPECT_EQ(nullptr, info.front_unit);
+  EXPECT_EQ(nullptr, info.configs);
+}
+
+TEST_F(AccessUnitQueueTest, ChunksDoNotLeak) {
+  AUDescriptor chunk[] = {
+      {kNormal, "0"}, {kNormal, "1"}, {kNormal, "2"}, {kNormal, "3"}};
+
+  AccessUnitQueue au_queue;
+  au_queue.PushBack(CreateDemuxerData(chunk, ARRAY_SIZE(chunk)));
+
+  // Verify that the old chunks get deleted (we rely on NumChunksForTesting())
+  for (size_t i = 0; i < 100; ++i) {
+    au_queue.PushBack(CreateDemuxerData(chunk, ARRAY_SIZE(chunk)));
+    for (size_t j = 0; j < ARRAY_SIZE(chunk); ++j)
+      au_queue.Advance();
+
+    // 5 is an arbitrary number, it implies that we keep 4 chunks of history.
+    EXPECT_GT(5U, au_queue.NumChunksForTesting());
+  }
+}
+
+TEST_F(AccessUnitQueueTest, PushAfterStarvation) {
+  // Two chunks
+  AUDescriptor chunk[][4] = {
+      {{kNormal, "0"}, {kNormal, "1"}, {kNormal, "2"}, {kNormal, "3"}},
+      {{kNormal, "4"}, {kNormal, "5"}, {kNormal, "6"}, {kNormal, "7"}}};
+
+  AccessUnitQueue au_queue;
+
+  // Push the first chunk.
+  au_queue.PushBack(CreateDemuxerData(chunk[0], ARRAY_SIZE(chunk[0])));
+
+  // Advance past the end of queue.
+  for (size_t i = 0; i < ARRAY_SIZE(chunk[0]); ++i)
+    au_queue.Advance();
+
+  // An extra Advance() should not change anything.
+  au_queue.Advance();
+
+  // Push the second chunk
+  au_queue.PushBack(CreateDemuxerData(chunk[1], ARRAY_SIZE(chunk[1])));
+
+  // Verify that we get the next access unit.
+  AccessUnitQueue::Info info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('4', info);
+}
+
+TEST_F(AccessUnitQueueTest, HasEOS) {
+  // Two chunks
+  AUDescriptor chunk[][4] = {
+      {{kNormal, "0"}, {kNormal, "1"}, {kNormal, "2"}, {kNormal, "3"}},
+      {{kNormal, "4"}, {kNormal, "5"}, {kNormal, "6"}, {kEOS, "7"}}};
+
+  AccessUnitQueue au_queue;
+  au_queue.PushBack(CreateDemuxerData(chunk[0], ARRAY_SIZE(chunk[0])));
+  au_queue.PushBack(CreateDemuxerData(chunk[1], ARRAY_SIZE(chunk[1])));
+
+  // Verify that after EOS has been pushed into the queue,
+  // it is reported for every GetInfo()
+  for (int i = 0; i < 8; ++i) {
+    AccessUnitQueue::Info info = au_queue.GetInfo();
+
+    EXPECT_TRUE(info.has_eos);
+    EXPECT_EQ(nullptr, info.configs);
+
+    if (i == 7)
+      EXPECT_TRUE(info.front_unit->is_end_of_stream);
+    else
+      VERIFY_FIRST_BYTE('0' + i, info);
+
+    au_queue.Advance();
+  }
+}
+
+TEST_F(AccessUnitQueueTest, HasConfigs) {
+  AUDescriptor chunk[] = {
+      {kNormal, "0"}, {kNormal, "1"}, {kNormal, "2"}, {kConfig, "3"}};
+
+  AccessUnitQueue au_queue;
+  au_queue.PushBack(CreateDemuxerData(chunk, ARRAY_SIZE(chunk)));
+
+  for (int i = 0; i < 4; ++i) {
+    AccessUnitQueue::Info info = au_queue.GetInfo();
+
+    if (i != 3)
+      EXPECT_EQ(nullptr, info.configs);
+    else
+      EXPECT_NE(nullptr, info.configs);
+
+    au_queue.Advance();
+  }
+}
+
+TEST_F(AccessUnitQueueTest, ConfigsAndKeyFrame) {
+  // Two chunks
+  AUDescriptor chunk[][4] = {
+      {{kNormal, "0"}, {kKeyFrame, "1"}, {kNormal, "2"}, {kConfig, "3"}},
+      {{kKeyFrame, "4"}, {kNormal, "5"}, {kNormal, "6"}, {kNormal, "7"}}};
+
+  AccessUnitQueue::Info info;
+
+  AccessUnitQueue au_queue;
+  au_queue.PushBack(CreateDemuxerData(chunk[0], ARRAY_SIZE(chunk[0])));
+  au_queue.PushBack(CreateDemuxerData(chunk[1], ARRAY_SIZE(chunk[1])));
+
+  // There is no prior key frame
+  EXPECT_FALSE(au_queue.RewindToLastKeyFrame());
+
+  // Consume first access unit.
+  au_queue.Advance();
+
+  // Now the current one is the key frame. It would be safe to configure codec
+  // at this moment, so RewindToLastKeyFrame() should return true.
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('1', info);
+
+  au_queue.Advance();  // now current unit is "2"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('2', info);
+
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());  // should go back to "1"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('1', info);
+
+  au_queue.Advance();  // now current unit is "2"
+  au_queue.Advance();  // now current unit is "3"
+
+  // Verify that we are at "3".
+  info = au_queue.GetInfo();
+  EXPECT_NE(nullptr, info.configs);
+
+  // Although it would be safe to configure codec (with old config) in this
+  // position since it will be immediately reconfigured from the next unit "3",
+  // current implementation returns unit "1".
+
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());  // should go back to "1"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('1', info);
+
+  au_queue.Advance();  // now current unit is "2"
+  au_queue.Advance();  // now current unit is "3"
+  au_queue.Advance();  // now current unit is "4"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('4', info);
+
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());  // should stay at "4"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('4', info);
+
+  au_queue.Advance();  // now current unit is "5"
+  au_queue.Advance();  // now current unit is "6"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('6', info);
+
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());  // should go back to "4"
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('4', info);
+}
+
+TEST_F(AccessUnitQueueTest, KeyFrameWithLongHistory) {
+  // Four chunks
+  AUDescriptor chunk[][4] = {
+      {{kNormal, "0"}, {kKeyFrame, "1"}, {kNormal, "2"}, {kNormal, "3"}},
+      {{kNormal, "4"}, {kNormal, "5"}, {kNormal, "6"}, {kNormal, "7"}},
+      {{kNormal, "8"}, {kNormal, "9"}, {kNormal, "a"}, {kNormal, "b"}},
+      {{kNormal, "c"}, {kNormal, "d"}, {kKeyFrame, "e"}, {kNormal, "f"}}};
+
+  AccessUnitQueue::Info info;
+
+  AccessUnitQueue au_queue;
+  for (int i = 0; i < 4; ++i)
+    au_queue.PushBack(CreateDemuxerData(chunk[i], ARRAY_SIZE(chunk[i])));
+
+  au_queue.SetHistorySizeForTesting(3);
+
+  // Advance to '3'.
+  for (int i = 0; i < 3; ++i)
+    au_queue.Advance();
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('3', info);
+
+  // Rewind to key frame, the current unit should be '1'.
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('1', info);
+
+  // Advance to 'c'.
+  for (int i = 0; i < 11; ++i)
+    au_queue.Advance();
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('c', info);
+
+  // Rewind to key frame, the current unit should be '1' again.
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('1', info);
+
+  // Set history size to 0 (default)
+  au_queue.SetHistorySizeForTesting(0);
+
+  // Advance to 'd'. Should erase all chunks except the last.
+  for (int i = 0; i < 12; ++i)
+    au_queue.Advance();
+
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('d', info);
+
+  // Rewind should not find any key frames.
+  EXPECT_FALSE(au_queue.RewindToLastKeyFrame());
+
+  au_queue.Advance();  // Advance to key frame 'e'.
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('e', info);
+
+  // Rewind should find the same unit 'e.
+  EXPECT_TRUE(au_queue.RewindToLastKeyFrame());
+  info = au_queue.GetInfo();
+  VERIFY_FIRST_BYTE('e', info);
+}
+
+}  // namespace media