media/formats/mp4/avc_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string.h>
   6
   7 #include "base/basictypes.h"
   8 #include "base/strings/string_split.h"
   9 #include "base/strings/string_util.h"
  10 #include "media/base/decrypt_config.h"
  11 #include "media/base/stream_parser_buffer.h"
  12 #include "media/filters/h264_parser.h"
  13 #include "media/formats/mp4/avc.h"
  14 #include "media/formats/mp4/box_definitions.h"
  15 #include "testing/gtest/include/gtest/gtest.h"
  16
  17 namespace media {
  18 namespace mp4 {
  19
  20 static const uint8 kNALU1[] = { 0x01, 0x02, 0x03 };
  21 static const uint8 kNALU2[] = { 0x04, 0x05, 0x06, 0x07 };
  22 static const uint8 kExpected[] = {
  23   0x00, 0x00, 0x00, 0x01, 0x01, 0x02, 0x03,
  24   0x00, 0x00, 0x00, 0x01, 0x04, 0x05, 0x06, 0x07 };
  25
  26 static const uint8 kExpectedParamSets[] = {
  27   0x00, 0x00, 0x00, 0x01, 0x67, 0x12,
  28   0x00, 0x00, 0x00, 0x01, 0x67, 0x34,
  29   0x00, 0x00, 0x00, 0x01, 0x68, 0x56, 0x78};
  30
  31 static H264NALU::Type StringToNALUType(const std::string& name) {
  32   if (name == "P")
  33     return H264NALU::kNonIDRSlice;
  34
  35   if (name == "I")
  36     return H264NALU::kIDRSlice;
  37
  38   if (name == "SEI")
  39     return H264NALU::kSEIMessage;
  40
  41   if (name == "SPS")
  42     return H264NALU::kSPS;
  43
  44   if (name == "SPSExt")
  45     return H264NALU::kSPSExt;
  46
  47   if (name == "PPS")
  48     return H264NALU::kPPS;
  49
  50   if (name == "AUD")
  51     return H264NALU::kAUD;
  52
  53   if (name == "EOSeq")
  54     return H264NALU::kEOSeq;
  55
  56   if (name == "EOStr")
  57     return H264NALU::kEOStream;
  58
  59   if (name == "FILL")
  60     return H264NALU::kFiller;
  61
  62   if (name == "R14")
  63     return H264NALU::kReserved14;
  64
  65   CHECK(false) << "Unexpected name: " << name;
  66   return H264NALU::kUnspecified;
  67 }
  68
  69 static std::string NALUTypeToString(int type) {
  70   switch (type) {
  71     case H264NALU::kNonIDRSlice:
  72       return "P";
  73     case H264NALU::kSliceDataA:
  74       return "SDA";
  75     case H264NALU::kSliceDataB:
  76       return "SDB";
  77     case H264NALU::kSliceDataC:
  78       return "SDC";
  79     case H264NALU::kIDRSlice:
  80       return "I";
  81     case H264NALU::kSEIMessage:
  82       return "SEI";
  83     case H264NALU::kSPS:
  84       return "SPS";
  85     case H264NALU::kSPSExt:
  86       return "SPSExt";
  87     case H264NALU::kPPS:
  88       return "PPS";
  89     case H264NALU::kAUD:
  90       return "AUD";
  91     case H264NALU::kEOSeq:
  92       return "EOSeq";
  93     case H264NALU::kEOStream:
  94       return "EOStr";
  95     case H264NALU::kFiller:
  96       return "FILL";
  97     case H264NALU::kReserved14:
  98       return "R14";
  99
 100     case H264NALU::kUnspecified:
 101     case H264NALU::kReserved15:
 102     case H264NALU::kReserved16:
 103     case H264NALU::kReserved17:
 104     case H264NALU::kReserved18:
 105     case H264NALU::kCodedSliceAux:
 106     case H264NALU::kCodedSliceExtension:
 107       CHECK(false) << "Unexpected type: " << type;
 108       break;
 109   };
 110
 111   return "UnsupportedType";
 112 }
 113
 114 static void WriteStartCodeAndNALUType(std::vector<uint8>* buffer,
 115                                       const std::string& nal_unit_type) {
 116   buffer->push_back(0x00);
 117   buffer->push_back(0x00);
 118   buffer->push_back(0x00);
 119   buffer->push_back(0x01);
 120   buffer->push_back(StringToNALUType(nal_unit_type));
 121 }
 122
 123 // Input string should be one or more NALU types separated with spaces or
 124 // commas. NALU grouped together and separated by commas are placed into the
 125 // same subsample, NALU groups separated by spaces are placed into separate
 126 // subsamples.
 127 // For example: input string "SPS PPS I" produces Annex B buffer containing
 128 // SPS, PPS and I NALUs, each in a separate subsample. While input string
 129 // "SPS,PPS I" produces Annex B buffer where the first subsample contains SPS
 130 // and PPS NALUs and the second subsample contains the I-slice NALU.
 131 // The output buffer will contain a valid-looking Annex B (it's valid-looking in
 132 // the sense that it has start codes and correct NALU types, but the actual NALU
 133 // payload is junk).
 134 void StringToAnnexB(const std::string& str, std::vector<uint8>* buffer,
 135                     std::vector<SubsampleEntry>* subsamples) {
 136   DCHECK(!str.empty());
 137
 138   std::vector<std::string> subsample_specs = base::SplitString(
 139       str, " ", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 140   EXPECT_GT(subsample_specs.size(), 0u);
 141
 142   buffer->clear();
 143   for (size_t i = 0; i < subsample_specs.size(); ++i) {
 144     SubsampleEntry entry;
 145     size_t start = buffer->size();
 146
 147     std::vector<std::string> subsample_nalus = base::SplitString(
 148         subsample_specs[i], ",", base::KEEP_WHITESPACE,
 149         base::SPLIT_WANT_NONEMPTY);
 150     EXPECT_GT(subsample_nalus.size(), 0u);
 151     for (size_t j = 0; j < subsample_nalus.size(); ++j) {
 152       WriteStartCodeAndNALUType(buffer, subsample_nalus[j]);
 153
 154       // Write junk for the payload since the current code doesn't
 155       // actually look at it.
 156       buffer->push_back(0x32);
 157       buffer->push_back(0x12);
 158       buffer->push_back(0x67);
 159     }
 160
 161     entry.clear_bytes = buffer->size() - start;
 162
 163     if (subsamples) {
 164       // Simulate the encrypted bits containing something that looks
 165       // like a SPS NALU.
 166       WriteStartCodeAndNALUType(buffer, "SPS");
 167     }
 168
 169     entry.cypher_bytes = buffer->size() - start - entry.clear_bytes;
 170
 171     if (subsamples) {
 172       subsamples->push_back(entry);
 173     }
 174   }
 175 }
 176
 177 std::string AnnexBToString(const std::vector<uint8>& buffer,
 178                            const std::vector<SubsampleEntry>& subsamples) {
 179   std::stringstream ss;
 180
 181   H264Parser parser;
 182   parser.SetEncryptedStream(&buffer[0], buffer.size(), subsamples);
 183
 184   H264NALU nalu;
 185   bool first = true;
 186   size_t current_subsample_index = 0;
 187   while (parser.AdvanceToNextNALU(&nalu) == H264Parser::kOk) {
 188     size_t subsample_index = AVC::FindSubsampleIndex(buffer, &subsamples,
 189                                                      nalu.data);
 190     if (!first) {
 191       ss << (subsample_index == current_subsample_index ? "," : " ");
 192     } else {
 193       DCHECK_EQ(subsample_index, current_subsample_index);
 194       first = false;
 195     }
 196
 197     ss << NALUTypeToString(nalu.nal_unit_type);
 198     current_subsample_index = subsample_index;
 199   }
 200   return ss.str();
 201 }
 202
 203 class AVCConversionTest : public testing::TestWithParam<int> {
 204  protected:
 205   void WriteLength(int length_size, int length, std::vector<uint8>* buf) {
 206     DCHECK_GE(length, 0);
 207     DCHECK_LE(length, 255);
 208
 209     for (int i = 1; i < length_size; i++)
 210       buf->push_back(0);
 211     buf->push_back(length);
 212   }
 213
 214   void MakeInputForLength(int length_size, std::vector<uint8>* buf) {
 215     buf->clear();
 216
 217     WriteLength(length_size, sizeof(kNALU1), buf);
 218     buf->insert(buf->end(), kNALU1, kNALU1 + sizeof(kNALU1));
 219
 220     WriteLength(length_size, sizeof(kNALU2), buf);
 221     buf->insert(buf->end(), kNALU2, kNALU2 + sizeof(kNALU2));
 222   }
 223
 224 };
 225
 226 TEST_P(AVCConversionTest, ParseCorrectly) {
 227   std::vector<uint8> buf;
 228   std::vector<SubsampleEntry> subsamples;
 229   MakeInputForLength(GetParam(), &buf);
 230   EXPECT_TRUE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 231   EXPECT_TRUE(AVC::IsValidAnnexB(buf, subsamples));
 232   EXPECT_EQ(buf.size(), sizeof(kExpected));
 233   EXPECT_EQ(0, memcmp(kExpected, &buf[0], sizeof(kExpected)));
 234   EXPECT_EQ("P,SDC", AnnexBToString(buf, subsamples));
 235 }
 236
 237 // Intentionally write NALU sizes that are larger than the buffer.
 238 TEST_P(AVCConversionTest, NALUSizeTooLarge) {
 239   std::vector<uint8> buf;
 240   WriteLength(GetParam(), 10 * sizeof(kNALU1), &buf);
 241   buf.insert(buf.end(), kNALU1, kNALU1 + sizeof(kNALU1));
 242   EXPECT_FALSE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 243 }
 244
 245 TEST_P(AVCConversionTest, NALUSizeIsZero) {
 246   std::vector<uint8> buf;
 247   WriteLength(GetParam(), 0, &buf);
 248
 249   WriteLength(GetParam(), sizeof(kNALU1), &buf);
 250   buf.insert(buf.end(), kNALU1, kNALU1 + sizeof(kNALU1));
 251
 252   WriteLength(GetParam(), 0, &buf);
 253
 254   WriteLength(GetParam(), sizeof(kNALU2), &buf);
 255   buf.insert(buf.end(), kNALU2, kNALU2 + sizeof(kNALU2));
 256
 257   EXPECT_FALSE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 258 }
 259
 260 TEST_P(AVCConversionTest, ParsePartial) {
 261   std::vector<uint8> buf;
 262   MakeInputForLength(GetParam(), &buf);
 263   buf.pop_back();
 264   EXPECT_FALSE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 265   // This tests a buffer ending in the middle of a NAL length. For length size
 266   // of one, this can't happen, so we skip that case.
 267   if (GetParam() != 1) {
 268     MakeInputForLength(GetParam(), &buf);
 269     buf.erase(buf.end() - (sizeof(kNALU2) + 1), buf.end());
 270     EXPECT_FALSE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 271   }
 272 }
 273
 274 TEST_P(AVCConversionTest, ParseEmpty) {
 275   std::vector<uint8> buf;
 276   EXPECT_TRUE(AVC::ConvertFrameToAnnexB(GetParam(), &buf));
 277   EXPECT_EQ(0u, buf.size());
 278 }
 279
 280 INSTANTIATE_TEST_CASE_P(AVCConversionTestValues,
 281                         AVCConversionTest,
 282                         ::testing::Values(1, 2, 4));
 283
 284 TEST_F(AVCConversionTest, ConvertConfigToAnnexB) {
 285   AVCDecoderConfigurationRecord avc_config;
 286   avc_config.sps_list.resize(2);
 287   avc_config.sps_list[0].push_back(0x67);
 288   avc_config.sps_list[0].push_back(0x12);
 289   avc_config.sps_list[1].push_back(0x67);
 290   avc_config.sps_list[1].push_back(0x34);
 291   avc_config.pps_list.resize(1);
 292   avc_config.pps_list[0].push_back(0x68);
 293   avc_config.pps_list[0].push_back(0x56);
 294   avc_config.pps_list[0].push_back(0x78);
 295
 296   std::vector<uint8> buf;
 297   std::vector<SubsampleEntry> subsamples;
 298   EXPECT_TRUE(AVC::ConvertConfigToAnnexB(avc_config, &buf));
 299   EXPECT_EQ(0, memcmp(kExpectedParamSets, &buf[0],
 300                       sizeof(kExpectedParamSets)));
 301   EXPECT_EQ("SPS,SPS,PPS", AnnexBToString(buf, subsamples));
 302 }
 303
 304 // Verify that we can round trip string -> Annex B -> string.
 305 TEST_F(AVCConversionTest, StringConversionFunctions) {
 306   std::string str =
 307       "AUD SPS SPSExt SPS PPS SEI SEI R14 I P FILL EOSeq EOStr";
 308   std::vector<uint8> buf;
 309   std::vector<SubsampleEntry> subsamples;
 310   StringToAnnexB(str, &buf, &subsamples);
 311   EXPECT_TRUE(AVC::IsValidAnnexB(buf, subsamples));
 312
 313   EXPECT_EQ(str, AnnexBToString(buf, subsamples));
 314 }
 315
 316 TEST_F(AVCConversionTest, ValidAnnexBConstructs) {
 317   const char* test_cases[] = {
 318     "I",
 319     "I I I I",
 320     "AUD I",
 321     "AUD SPS PPS I",
 322     "I EOSeq",
 323     "I EOSeq EOStr",
 324     "I EOStr",
 325     "P",
 326     "P P P P",
 327     "AUD SPS PPS P",
 328     "SEI SEI I",
 329     "SEI SEI R14 I",
 330     "SPS SPSExt SPS PPS I P",
 331     "R14 SEI I",
 332     "AUD,I",
 333     "AUD,SEI I",
 334     "AUD,SEI,SPS,PPS,I"
 335   };
 336
 337   for (size_t i = 0; i < arraysize(test_cases); ++i) {
 338     std::vector<uint8> buf;
 339     std::vector<SubsampleEntry> subsamples;
 340     StringToAnnexB(test_cases[i], &buf, NULL);
 341     EXPECT_TRUE(AVC::IsValidAnnexB(buf, subsamples)) << "'" << test_cases[i]
 342                                                      << "' failed";
 343   }
 344 }
 345
 346 TEST_F(AVCConversionTest, InvalidAnnexBConstructs) {
 347   static const char* test_cases[] = {
 348     "AUD",  // No VCL present.
 349     "AUD,SEI", // No VCL present.
 350     "SPS PPS",  // No VCL present.
 351     "SPS PPS AUD I",  // Parameter sets must come after AUD.
 352     "SPSExt SPS P",  // SPS must come before SPSExt.
 353     "SPS PPS SPSExt P",  // SPSExt must follow an SPS.
 354     "EOSeq",  // EOSeq must come after a VCL.
 355     "EOStr",  // EOStr must come after a VCL.
 356     "I EOStr EOSeq",  // EOSeq must come before EOStr.
 357     "I R14",  // Reserved14-18 must come before first VCL.
 358     "I SEI",  // SEI must come before first VCL.
 359     "P SPS P", // SPS after first VCL would indicate a new access unit.
 360   };
 361
 362   for (size_t i = 0; i < arraysize(test_cases); ++i) {
 363     std::vector<uint8> buf;
 364     std::vector<SubsampleEntry> subsamples;
 365     StringToAnnexB(test_cases[i], &buf, NULL);
 366     EXPECT_FALSE(AVC::IsValidAnnexB(buf, subsamples)) << "'" << test_cases[i]
 367                                                       << "' failed";
 368   }
 369 }
 370
 371 typedef struct {
 372   const char* input;
 373   const char* expected;
 374 } InsertTestCases;
 375
 376 TEST_F(AVCConversionTest, InsertParamSetsAnnexB) {
 377   static const InsertTestCases test_cases[] = {
 378     { "I", "SPS,SPS,PPS,I" },
 379     { "AUD I", "AUD SPS,SPS,PPS,I" },
 380
 381     // Cases where param sets in |avc_config| are placed before
 382     // the existing ones.
 383     { "SPS,PPS,I", "SPS,SPS,PPS,SPS,PPS,I" },
 384     { "AUD,SPS,PPS,I", "AUD,SPS,SPS,PPS,SPS,PPS,I" },  // Note: params placed
 385                                                        // after AUD.
 386
 387     // One or more NALUs might follow AUD in the first subsample, we need to
 388     // handle this correctly. Params should be inserted right after AUD.
 389     { "AUD,SEI I", "AUD,SPS,SPS,PPS,SEI I" },
 390   };
 391
 392   AVCDecoderConfigurationRecord avc_config;
 393   avc_config.sps_list.resize(2);
 394   avc_config.sps_list[0].push_back(0x67);
 395   avc_config.sps_list[0].push_back(0x12);
 396   avc_config.sps_list[1].push_back(0x67);
 397   avc_config.sps_list[1].push_back(0x34);
 398   avc_config.pps_list.resize(1);
 399   avc_config.pps_list[0].push_back(0x68);
 400   avc_config.pps_list[0].push_back(0x56);
 401   avc_config.pps_list[0].push_back(0x78);
 402
 403   for (size_t i = 0; i < arraysize(test_cases); ++i) {
 404     std::vector<uint8> buf;
 405     std::vector<SubsampleEntry> subsamples;
 406
 407     StringToAnnexB(test_cases[i].input, &buf, &subsamples);
 408
 409     EXPECT_TRUE(AVC::InsertParamSetsAnnexB(avc_config, &buf, &subsamples))
 410         << "'" << test_cases[i].input << "' insert failed.";
 411     EXPECT_TRUE(AVC::IsValidAnnexB(buf, subsamples))
 412         << "'" << test_cases[i].input << "' created invalid AnnexB.";
 413     EXPECT_EQ(test_cases[i].expected, AnnexBToString(buf, subsamples))
 414         << "'" << test_cases[i].input << "' generated unexpected output.";
 415   }
 416 }
 417
 418 }  // namespace mp4
 419 }  // namespace media