/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <gtest/gtest.h>
#include <stdint.h>

#include "ContainerParser.h"
#include "mozilla/gtest/MozAssertions.h"

using namespace mozilla;
using TimeUnit = mozilla::media::TimeUnit;

TEST(ContainerParser, MIMETypes)
{
  const char* containerTypes[] = {"video/webm", "audio/webm", "video/mp4",
                                  "audio/mp4", "audio/aac"};
  UniquePtr<ContainerParser> parser;
  for (size_t i = 0; i < std::size(containerTypes); ++i) {
    Maybe<MediaContainerType> containerType =
        MakeMediaContainerType(containerTypes[i]);
    ASSERT_TRUE(containerType.isSome());
    parser = ContainerParser::CreateForMIMEType(*containerType);
    ASSERT_NE(parser, nullptr);
  }
}

already_AddRefed<MediaByteBuffer> make_adts_header() {
  const uint8_t test[] = {0xff, 0xf1, 0x50, 0x80, 0x03, 0x1f, 0xfc};
  RefPtr<MediaByteBuffer> buffer(new MediaByteBuffer);
  buffer->AppendElements(test, std::size(test));
  return buffer.forget();
}

TEST(ContainerParser, ADTSHeader)
{
  UniquePtr<ContainerParser> parser;
  parser = ContainerParser::CreateForMIMEType(
      MediaContainerType(MEDIAMIMETYPE("audio/aac")));
  ASSERT_NE(parser, nullptr);

  // Audio data should have no gaps.
  EXPECT_EQ(parser->GetRoundingError(), 0);

  // Test a valid header.
  RefPtr<MediaByteBuffer> header = make_adts_header();
  EXPECT_NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header)));

  // Test variations.
  uint8_t save = header->ElementAt(1);
  for (uint8_t i = 1; i < 3; ++i) {
    // Set non-zero layer.
    header->ReplaceElementAt(1, (header->ElementAt(1) & 0xf9) | (i << 1));
    EXPECT_FALSE(NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header))))
        << "Accepted non-zero layer in header.";
  }
  header->ReplaceElementAt(1, save);
  save = header->ElementAt(2);
  header->ReplaceElementAt(2, (header->ElementAt(2) & 0x3b) | (15 << 2));
  EXPECT_FALSE(NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header))))
      << "Accepted explicit frequency in header.";
  header->ReplaceElementAt(2, save);

  // Test a short header.
  header->SetLength(6);
  EXPECT_FALSE(NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header))))
      << "Accepted too-short header.";
  EXPECT_FALSE(NS_SUCCEEDED(parser->IsMediaSegmentPresent(MediaSpan(header))))
      << "Found media segment when there was just a partial header.";

  // Test a header with short data.
  header = make_adts_header();
  header->AppendElements(1);
  EXPECT_TRUE(NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header))))
      << "Rejected a valid header.";
  EXPECT_TRUE(NS_SUCCEEDED(parser->IsMediaSegmentPresent(MediaSpan(header))))
      << "Rejected a one-byte media segment.";

  // Test parse results.
  header = make_adts_header();
  EXPECT_FALSE(NS_SUCCEEDED(parser->IsMediaSegmentPresent(MediaSpan(header))))
      << "Found media segment when there was just a header.";
  TimeUnit start;
  TimeUnit end;
  EXPECT_TRUE(NS_FAILED(
      parser->ParseStartAndEndTimestamps(MediaSpan(header), start, end)));

  EXPECT_TRUE(parser->HasInitData());
  EXPECT_TRUE(parser->HasCompleteInitData());
  MediaByteBuffer* init = parser->InitData();
  ASSERT_NE(init, nullptr);
  EXPECT_EQ(init->Length(), header->Length());

  EXPECT_EQ(parser->InitSegmentRange(),
            MediaByteRange(0, int64_t(header->Length())));
  // Media segment range should be empty here.
  EXPECT_EQ(parser->MediaHeaderRange(), MediaByteRange());
  EXPECT_EQ(parser->MediaSegmentRange(), MediaByteRange());
}

TEST(ContainerParser, ADTSBlankMedia)
{
  UniquePtr<ContainerParser> parser;
  parser = ContainerParser::CreateForMIMEType(
      MediaContainerType(MEDIAMIMETYPE("audio/aac")));
  ASSERT_NE(parser, nullptr);

  // Audio data should have no gaps.
  EXPECT_EQ(parser->GetRoundingError(), 0);

  // Test the header only.
  RefPtr<MediaByteBuffer> header = make_adts_header();
  EXPECT_NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header)));

  // Test with the correct length of (invalid) frame data.
  size_t header_length = header->Length();
  size_t data_length = 24;
  size_t frame_length = header_length + data_length;
  header->AppendElements(data_length);
  EXPECT_TRUE(NS_SUCCEEDED(parser->IsInitSegmentPresent(MediaSpan(header))))
      << "Rejected a valid header.";
  EXPECT_TRUE(NS_SUCCEEDED(parser->IsMediaSegmentPresent(MediaSpan(header))))
      << "Rejected a full (but zeroed) media segment.";
  TimeUnit start;
  TimeUnit end;
  // We don't report timestamps from ADTS.
  EXPECT_TRUE(NS_FAILED(
      parser->ParseStartAndEndTimestamps(MediaSpan(header), start, end)));
  EXPECT_TRUE(start.IsZero());
  EXPECT_TRUE(end.IsZero());

  // Verify the parser calculated header and packet data boundaries.
  EXPECT_TRUE(parser->HasInitData());
  EXPECT_TRUE(parser->HasCompleteInitData());
  MediaByteBuffer* init = parser->InitData();
  ASSERT_NE(init, nullptr);
  EXPECT_EQ(init->Length(), header_length)
      << "Found incorrect init segment length.";
  EXPECT_EQ(parser->InitSegmentRange(),
            MediaByteRange(0, int64_t(header_length)));
  // In ADTS the Media Header is the same as the Media Segment.
  MediaByteRange expected_media =
      MediaByteRange(int64_t(header_length), int64_t(frame_length));
  EXPECT_EQ(parser->MediaHeaderRange(), expected_media);
  EXPECT_EQ(parser->MediaSegmentRange(), expected_media);
}