webrtc/modules/video_coding/h264_sps_pps_tracker_unittest.cc

/*
 *  Copyright (c) 2016 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 "webrtc/modules/video_coding/h264_sps_pps_tracker.h"

#include <vector>

#include "webrtc/modules/video_coding/packet.h"
#include "webrtc/test/gtest.h"
#include "webrtc/common_video/h264/h264_common.h"

namespace webrtc {
namespace video_coding {

namespace {
const uint8_t start_code[] = {0, 0, 0, 1};
}  // namespace

class TestH264SpsPpsTracker : public ::testing::Test {
 public:
  VCMPacket GetDefaultPacket() {
    VCMPacket packet;
    packet.codec = kVideoCodecH264;
    packet.video_header.codecHeader.H264.nalus_length = 0;
    packet.video_header.isFirstPacket = false;
    packet.video_header.codecHeader.H264.packetization_type = kH264SingleNalu;

    return packet;
  }

  void AddSps(VCMPacket* packet, int sps_id, std::vector<uint8_t>* data) {
    NaluInfo info;
    info.type = H264::NaluType::kSps;
    info.sps_id = sps_id;
    info.pps_id = -1;
    info.offset = data->size();
    info.size = 2;
    data->push_back(H264::NaluType::kSps);
    data->push_back(sps_id);  // The sps data, just a single byte.

    packet->video_header.codecHeader.H264
        .nalus[packet->video_header.codecHeader.H264.nalus_length++] = info;
  }

  void AddPps(VCMPacket* packet,
              int sps_id,
              int pps_id,
              std::vector<uint8_t>* data) {
    NaluInfo info;
    info.type = H264::NaluType::kPps;
    info.sps_id = sps_id;
    info.pps_id = pps_id;
    info.offset = data->size();
    info.size = 2;
    data->push_back(H264::NaluType::kPps);
    data->push_back(pps_id);  // The pps data, just a single byte.

    packet->video_header.codecHeader.H264
        .nalus[packet->video_header.codecHeader.H264.nalus_length++] = info;
  }

  void AddIdr(VCMPacket* packet, int pps_id) {
    NaluInfo info;
    info.type = H264::NaluType::kIdr;
    info.sps_id = -1;
    info.pps_id = pps_id;

    packet->video_header.codecHeader.H264
        .nalus[packet->video_header.codecHeader.H264.nalus_length++] = info;
  }

 protected:
  H264SpsPpsTracker tracker_;
};

TEST_F(TestH264SpsPpsTracker, NoNalus) {
  uint8_t data[] = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.codecHeader.H264.packetization_type = kH264FuA;
  packet.dataPtr = data;
  packet.sizeBytes = sizeof(data);

  EXPECT_EQ(H264SpsPpsTracker::kInsert, tracker_.CopyAndFixBitstream(&packet));
  EXPECT_EQ(memcmp(packet.dataPtr, data, sizeof(data)), 0);
  delete[] packet.dataPtr;
}

TEST_F(TestH264SpsPpsTracker, FuAFirstPacket) {
  uint8_t data[] = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.codecHeader.H264.packetization_type = kH264FuA;
  packet.video_header.isFirstPacket = true;
  packet.dataPtr = data;
  packet.sizeBytes = sizeof(data);

  EXPECT_EQ(H264SpsPpsTracker::kInsert, tracker_.CopyAndFixBitstream(&packet));
  std::vector<uint8_t> expected;
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {1, 2, 3});
  EXPECT_EQ(memcmp(packet.dataPtr, expected.data(), expected.size()), 0);
  delete[] packet.dataPtr;
}

TEST_F(TestH264SpsPpsTracker, StapAIncorrectSegmentLength) {
  uint8_t data[] = {0, 0, 2, 0};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.codecHeader.H264.packetization_type = kH264StapA;
  packet.video_header.isFirstPacket = true;
  packet.dataPtr = data;
  packet.sizeBytes = sizeof(data);

  EXPECT_EQ(H264SpsPpsTracker::kDrop, tracker_.CopyAndFixBitstream(&packet));
}

TEST_F(TestH264SpsPpsTracker, NoNalusFirstPacket) {
  uint8_t data[] = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.isFirstPacket = true;
  packet.dataPtr = data;
  packet.sizeBytes = sizeof(data);

  EXPECT_EQ(H264SpsPpsTracker::kInsert, tracker_.CopyAndFixBitstream(&packet));
  std::vector<uint8_t> expected;
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {1, 2, 3});
  EXPECT_EQ(memcmp(packet.dataPtr, expected.data(), expected.size()), 0);
  delete[] packet.dataPtr;
}

TEST_F(TestH264SpsPpsTracker, IdrNoSpsPpsInserted) {
  std::vector<uint8_t> data = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.codecHeader.H264.packetization_type = kH264FuA;

  AddIdr(&packet, 0);
  packet.dataPtr = data.data();
  packet.sizeBytes = data.size();

  EXPECT_EQ(H264SpsPpsTracker::kInsert, tracker_.CopyAndFixBitstream(&packet));
  EXPECT_EQ(memcmp(packet.dataPtr, data.data(), data.size()), 0);
  delete[] packet.dataPtr;
}

TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsPpsInserted) {
  std::vector<uint8_t> data = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.isFirstPacket = true;

  AddIdr(&packet, 0);
  packet.dataPtr = data.data();
  packet.sizeBytes = data.size();

  EXPECT_EQ(H264SpsPpsTracker::kRequestKeyframe,
            tracker_.CopyAndFixBitstream(&packet));
}

TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoPpsInserted) {
  std::vector<uint8_t> data = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.isFirstPacket = true;

  AddSps(&packet, 0, &data);
  AddIdr(&packet, 0);
  packet.dataPtr = data.data();
  packet.sizeBytes = data.size();

  EXPECT_EQ(H264SpsPpsTracker::kRequestKeyframe,
            tracker_.CopyAndFixBitstream(&packet));
}

TEST_F(TestH264SpsPpsTracker, IdrFirstPacketNoSpsInserted) {
  std::vector<uint8_t> data = {1, 2, 3};
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.isFirstPacket = true;

  AddPps(&packet, 0, 0, &data);
  AddIdr(&packet, 0);
  packet.dataPtr = data.data();
  packet.sizeBytes = data.size();

  EXPECT_EQ(H264SpsPpsTracker::kRequestKeyframe,
            tracker_.CopyAndFixBitstream(&packet));
}

TEST_F(TestH264SpsPpsTracker, SpsPpsPacketThenIdrFirstPacket) {
  std::vector<uint8_t> data;
  VCMPacket sps_pps_packet = GetDefaultPacket();

  // Insert SPS/PPS
  AddSps(&sps_pps_packet, 0, &data);
  AddPps(&sps_pps_packet, 0, 1, &data);
  sps_pps_packet.dataPtr = data.data();
  sps_pps_packet.sizeBytes = data.size();
  EXPECT_EQ(H264SpsPpsTracker::kDrop,
            tracker_.CopyAndFixBitstream(&sps_pps_packet));
  data.clear();

  // Insert first packet of the IDR
  VCMPacket idr_packet = GetDefaultPacket();
  idr_packet.video_header.isFirstPacket = true;
  AddIdr(&idr_packet, 1);
  data.insert(data.end(), {1, 2, 3});
  idr_packet.dataPtr = data.data();
  idr_packet.sizeBytes = data.size();
  EXPECT_EQ(H264SpsPpsTracker::kInsert,
            tracker_.CopyAndFixBitstream(&idr_packet));

  std::vector<uint8_t> expected;
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kSps, 0});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kPps, 1});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {1, 2, 3});
  EXPECT_EQ(memcmp(idr_packet.dataPtr, expected.data(), expected.size()), 0);
  delete[] idr_packet.dataPtr;
}

TEST_F(TestH264SpsPpsTracker, SpsPpsIdrInStapA) {
  std::vector<uint8_t> data;
  VCMPacket packet = GetDefaultPacket();
  packet.video_header.codecHeader.H264.packetization_type = kH264StapA;
  packet.video_header.isFirstPacket = true;  // Always true for StapA

  data.insert(data.end(), {0});     // First byte is ignored
  data.insert(data.end(), {0, 2});  // Length of segment
  AddSps(&packet, 13, &data);
  data.insert(data.end(), {0, 2});  // Length of segment
  AddPps(&packet, 13, 27, &data);
  data.insert(data.end(), {0, 5});  // Length of segment
  AddIdr(&packet, 27);
  data.insert(data.end(), {1, 2, 3, 2, 1});

  packet.dataPtr = data.data();
  packet.sizeBytes = data.size();
  EXPECT_EQ(H264SpsPpsTracker::kInsert, tracker_.CopyAndFixBitstream(&packet));

  std::vector<uint8_t> expected;
  // The SPS/PPS is repeated because this packet both contains the SPS/PPS
  // and it is the first packet of an IDR, which will cause the SPS/PPS to be
  // prepended to the bitstream.
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kSps, 13});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kPps, 27});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kSps, 13});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {H264::NaluType::kPps, 27});
  expected.insert(expected.end(), start_code, start_code + sizeof(start_code));
  expected.insert(expected.end(), {1, 2, 3, 2, 1});

  EXPECT_EQ(memcmp(packet.dataPtr, expected.data(), expected.size()), 0);
  delete[] packet.dataPtr;
}

}  // namespace video_coding
}  // namespace webrtc