Implement ISO BMFF support in Media Source (try 2).

media/mp4/box_reader_unittest.cc

+// Copyright (c) 2012 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 <string.h>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/mp4/box_reader.h"
+#include "media/mp4/rcheck.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+namespace mp4 {
+
+static const uint8 kTestBox[] = {
+  // Test box containing three children
+  0x00, 0x00, 0x00, 0x40, 't', 'e', 's', 't',
+  0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
+  0xf9, 0x0a, 0x0b, 0x0c, 0xfd, 0x0e, 0x0f, 0x10,
+  // Ordinary child box
+  0x00, 0x00, 0x00, 0x0c,  'c',  'h',  'l',  'd', 0xde, 0xad, 0xbe, 0xef,
+  // Extended-size child box
+  0x00, 0x00, 0x00, 0x01,  'c',  'h',  'l',  'd',
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x14,
+  0xfa, 0xce, 0xca, 0xfe,
+  // Empty box
+  0x00, 0x00, 0x00, 0x08,  'm',  'p',  't',  'y',
+  // Trailing garbage
+  0x00 };
+
+struct EmptyBox : Box {
+  virtual bool Parse(BoxReader* reader) OVERRIDE {
+    return true;
+  }
+  virtual FourCC BoxType() const OVERRIDE { return FOURCC_MPTY; }
+};
+
+struct ChildBox : Box {
+  uint32 val;
+
+  virtual bool Parse(BoxReader* reader) OVERRIDE {
+    return reader->Read4(&val);
+  }
+  virtual FourCC BoxType() const OVERRIDE { return FOURCC_CHLD; }
+};
+
+struct TestBox : Box {
+  uint8 a, b;
+  uint16 c;
+  int32 d;
+  int64 e;
+
+  std::vector<ChildBox> kids;
+  EmptyBox mpty;
+
+  virtual bool Parse(BoxReader* reader) OVERRIDE {
+    RCHECK(reader->ReadFullBoxHeader() &&
+           reader->Read1(&a) &&
+           reader->Read1(&b) &&
+           reader->Read2(&c) &&
+           reader->Read4s(&d) &&
+           reader->Read4sInto8s(&e));
+    return reader->ScanChildren() &&
+           reader->ReadChildren(&kids) &&
+           reader->MaybeReadChild(&mpty);
+  }
+  virtual FourCC BoxType() const OVERRIDE { return FOURCC_TEST; }
+
+  TestBox();
+  ~TestBox();
+};
+
+TestBox::TestBox() {}
+TestBox::~TestBox() {}
+
+class BoxReaderTest : public testing::Test {
+ protected:
+  std::vector<uint8> GetBuf() {
+    return std::vector<uint8>(kTestBox, kTestBox + sizeof(kTestBox));
+  }
+};
+
+TEST_F(BoxReaderTest, ExpectedOperationTest) {
+  std::vector<uint8> buf = GetBuf();
+  bool err;
+  scoped_ptr<BoxReader> reader(
+      BoxReader::ReadTopLevelBox(&buf[0], buf.size(), &err));
+  EXPECT_FALSE(err);
+  EXPECT_TRUE(reader.get());
+
+  TestBox box;
+  EXPECT_TRUE(box.Parse(reader.get()));
+  EXPECT_EQ(0x01, reader->version());
+  EXPECT_EQ(0x020304u, reader->flags());
+  EXPECT_EQ(0x05, box.a);
+  EXPECT_EQ(0x06, box.b);
+  EXPECT_EQ(0x0708, box.c);
+  EXPECT_EQ(static_cast<int32>(0xf90a0b0c), box.d);
+  EXPECT_EQ(static_cast<int32>(0xfd0e0f10), box.e);
+
+  EXPECT_EQ(2u, box.kids.size());
+  EXPECT_EQ(0xdeadbeef, box.kids[0].val);
+  EXPECT_EQ(0xfacecafe, box.kids[1].val);
+
+  // Accounting for the extra byte outside of the box above
+  EXPECT_EQ(buf.size(), static_cast<uint64>(reader->size() + 1));
+}
+
+TEST_F(BoxReaderTest, OuterTooShortTest) {
+  std::vector<uint8> buf = GetBuf();
+  bool err;
+
+  // Create a soft failure by truncating the outer box.
+  scoped_ptr<BoxReader> r(
+      BoxReader::ReadTopLevelBox(&buf[0], buf.size() - 2, &err));
+
+  EXPECT_FALSE(err);
+  EXPECT_FALSE(r.get());
+}
+
+TEST_F(BoxReaderTest, InnerTooLongTest) {
+  std::vector<uint8> buf = GetBuf();
+  bool err;
+
+  // Make an inner box too big for its outer box.
+  buf[25] = 1;
+  scoped_ptr<BoxReader> reader(
+      BoxReader::ReadTopLevelBox(&buf[0], buf.size(), &err));
+
+  TestBox box;
+  EXPECT_FALSE(box.Parse(reader.get()));
+}
+
+TEST_F(BoxReaderTest, WrongFourCCTest) {
+  std::vector<uint8> buf = GetBuf();
+  bool err;
+
+  // Use an unknown FourCC both on an outer box and an inner one.
+  buf[5] = 1;
+  buf[28] = 1;
+  scoped_ptr<BoxReader> reader(
+      BoxReader::ReadTopLevelBox(&buf[0], buf.size(), &err));
+
+  TestBox box;
+  std::vector<ChildBox> kids;
+  // This should still work; the outer box reader doesn't care about the FourCC,
+  // since it assumes you've already examined it before deciding what to parse.
+  EXPECT_TRUE(box.Parse(reader.get()));
+  EXPECT_EQ(0x74017374, reader->type());
+  // Parsing the TestBox should have left the modified inner box unread, which
+  // we collect here.
+  EXPECT_TRUE(reader->ReadAllChildren(&kids));
+  EXPECT_EQ(1u, kids.size());
+  EXPECT_EQ(0xdeadbeef, kids[0].val);
+}
+
+TEST_F(BoxReaderTest, ChildrenTest) {
+  std::vector<uint8> buf = GetBuf();
+  bool err;
+  scoped_ptr<BoxReader> reader(
+      BoxReader::ReadTopLevelBox(&buf[0], buf.size(), &err));
+
+  EXPECT_TRUE(reader->SkipBytes(16) && reader->ScanChildren());
+
+  EmptyBox mpty;
+  EXPECT_TRUE(reader->ReadChild(&mpty));
+  EXPECT_FALSE(reader->ReadChild(&mpty));
+  EXPECT_TRUE(reader->MaybeReadChild(&mpty));
+
+  std::vector<ChildBox> kids;
+
+  EXPECT_TRUE(reader->ReadAllChildren(&kids));
+  EXPECT_EQ(2u, kids.size());
+  kids.clear();
+  EXPECT_FALSE(reader->ReadChildren(&kids));
+  EXPECT_TRUE(reader->MaybeReadChildren(&kids));
+}
+
+}  // namespace mp4
+}  // namespace media