// Copyright (c) 2011 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 "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "media/base/media.h"
#include "media/ffmpeg/ffmpeg_common.h"
#include "media/filters/ffmpeg_glue.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace media {

class FFmpegCommonTest : public testing::Test {
 public:
  FFmpegCommonTest() {
    FFmpegGlue::InitializeFFmpeg();
  }
  ~FFmpegCommonTest() override{};
};

TEST_F(FFmpegCommonTest, OpusAudioDecoderConfig) {
  AVCodecContext context = {0};
  context.codec_type = AVMEDIA_TYPE_AUDIO;
  context.codec_id = AV_CODEC_ID_OPUS;
  context.channel_layout = CHANNEL_LAYOUT_STEREO;
  context.channels = 2;
  context.sample_fmt = AV_SAMPLE_FMT_FLT;

  // During conversion this sample rate should be changed to 48kHz.
  context.sample_rate = 44100;

  AudioDecoderConfig decoder_config;
  AVCodecContextToAudioDecoderConfig(&context, false, &decoder_config);
  EXPECT_EQ(48000, decoder_config.samples_per_second());
}

TEST_F(FFmpegCommonTest, TimeBaseConversions) {
  const int64 test_data[][5] = {
    {1, 2, 1, 500000, 1 },
    {1, 3, 1, 333333, 1 },
    {1, 3, 2, 666667, 2 },
  };

  for (size_t i = 0; i < arraysize(test_data); ++i) {
    SCOPED_TRACE(i);

    AVRational time_base;
    time_base.num = static_cast<int>(test_data[i][0]);
    time_base.den = static_cast<int>(test_data[i][1]);

    base::TimeDelta time_delta =
        ConvertFromTimeBase(time_base, test_data[i][2]);

    EXPECT_EQ(time_delta.InMicroseconds(), test_data[i][3]);
    EXPECT_EQ(ConvertToTimeBase(time_base, time_delta), test_data[i][4]);
  }
}

TEST_F(FFmpegCommonTest, VerifyFormatSizes) {
  for (AVSampleFormat format = AV_SAMPLE_FMT_NONE;
       format < AV_SAMPLE_FMT_NB;
       format = static_cast<AVSampleFormat>(format + 1)) {
    SampleFormat sample_format = AVSampleFormatToSampleFormat(format);
    if (sample_format == kUnknownSampleFormat) {
      // This format not supported, so skip it.
      continue;
    }

    // Have FFMpeg compute the size of a buffer of 1 channel / 1 frame
    // with 1 byte alignment to make sure the sizes match.
    int single_buffer_size = av_samples_get_buffer_size(NULL, 1, 1, format, 1);
    int bytes_per_channel = SampleFormatToBytesPerChannel(sample_format);
    EXPECT_EQ(bytes_per_channel, single_buffer_size);
  }
}

TEST_F(FFmpegCommonTest, UTCDateToTime_Valid) {
  base::Time result;
  EXPECT_TRUE(FFmpegUTCDateToTime("2012-11-10 12:34:56", &result));

  base::Time::Exploded exploded;
  result.UTCExplode(&exploded);
  EXPECT_TRUE(exploded.HasValidValues());
  EXPECT_EQ(2012, exploded.year);
  EXPECT_EQ(11, exploded.month);
  EXPECT_EQ(6, exploded.day_of_week);
  EXPECT_EQ(10, exploded.day_of_month);
  EXPECT_EQ(12, exploded.hour);
  EXPECT_EQ(34, exploded.minute);
  EXPECT_EQ(56, exploded.second);
  EXPECT_EQ(0, exploded.millisecond);
}

TEST_F(FFmpegCommonTest, UTCDateToTime_Invalid) {
  const char* invalid_date_strings[] = {
    "",
    "2012-11-10",
    "12:34:56",
    "-- ::",
    "2012-11-10 12:34:",
    "2012-11-10 12::56",
    "2012-11-10 :34:56",
    "2012-11- 12:34:56",
    "2012--10 12:34:56",
    "-11-10 12:34:56",
    "2012-11 12:34:56",
    "2012-11-10-12 12:34:56",
    "2012-11-10 12:34",
    "2012-11-10 12:34:56:78",
    "ABCD-11-10 12:34:56",
    "2012-EF-10 12:34:56",
    "2012-11-GH 12:34:56",
    "2012-11-10 IJ:34:56",
    "2012-11-10 12:JL:56",
    "2012-11-10 12:34:MN",
    "2012-11-10 12:34:56.123",
    "2012-11-1012:34:56",
    "2012-11-10 12:34:56 UTC",
  };

  for (size_t i = 0; i < arraysize(invalid_date_strings); ++i) {
    const char* date_string = invalid_date_strings[i];
    base::Time result;
    EXPECT_FALSE(FFmpegUTCDateToTime(date_string, &result))
        << "date_string '" << date_string << "'";
    EXPECT_TRUE(result.is_null());
  }
}

// Verifies there are no collisions of the codec name hashes used for UMA.  Also
// includes code for updating the histograms XML.
TEST_F(FFmpegCommonTest, VerifyUmaCodecHashes) {
  const AVCodecDescriptor* desc = avcodec_descriptor_next(nullptr);

  std::map<int32_t, const char*> sorted_hashes;
  while (desc) {
    const int32_t hash = HashCodecName(desc->name);
    // Ensure there are no collisions.
    ASSERT_TRUE(sorted_hashes.find(hash) == sorted_hashes.end());
    sorted_hashes[hash] = desc->name;

    desc = avcodec_descriptor_next(desc);
  }

  // Add a none entry for when no codec is detected.
  static const char kUnknownCodec[] = "none";
  const int32_t hash = HashCodecName(kUnknownCodec);
  ASSERT_TRUE(sorted_hashes.find(hash) == sorted_hashes.end());
  sorted_hashes[hash] = kUnknownCodec;

  // Uncomment the following lines to generate the "FFmpegCodecHashes" enum for
  // usage in the histogram metrics file.  While it regenerates *ALL* values, it
  // should only be used to *ADD* values to histograms file.  Never delete any
  // values; diff should verify.
#if 0
  printf("<enum name=\"FFmpegCodecHashes\" type=\"int\">\n");
  for (const auto& kv : sorted_hashes)
    printf("  <int value=\"%d\" label=\"%s\"/>\n", kv.first, kv.second);
  printf("</enum>\n");
#endif
}

}  // namespace media