// Copyright 2019 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.
// Note: ported from Chromium commit head: 27c98933749f

#include "fourcc.h"

#include <linux/videodev2.h>

#include "base/logging.h"
#include "base/strings/stringprintf.h"

#include "macros.h"

namespace media {

Fourcc::Fourcc(Fourcc::Value fourcc) : value_(fourcc) {}
Fourcc::~Fourcc() = default;
Fourcc& Fourcc::operator=(const Fourcc& other) = default;

// static
base::Optional<Fourcc> Fourcc::FromUint32(uint32_t fourcc) {
  switch (fourcc) {
    case AR24:
    case AB24:
    case XR24:
    case XB24:
    case RGB4:
    case YU12:
    case YV12:
    case YM12:
    case YM21:
    case YUYV:
    case NV12:
    case NV21:
    case NM12:
    case NM21:
    case YM16:
    case MT21:
    case MM21:
      return Fourcc(static_cast<Value>(fourcc));
  }
  DVLOGF(3) << "Unmapped fourcc: " << FourccToString(fourcc);
  return base::nullopt;
}

// static
base::Optional<Fourcc> Fourcc::FromVideoPixelFormat(
    VideoPixelFormat pixel_format,
    bool single_planar) {
  if (single_planar) {
    switch (pixel_format) {
      case PIXEL_FORMAT_ARGB:
        return Fourcc(AR24);
      case PIXEL_FORMAT_ABGR:
        return Fourcc(AB24);
      case PIXEL_FORMAT_XRGB:
        return Fourcc(XR24);
      case PIXEL_FORMAT_XBGR:
        return Fourcc(XB24);
      case PIXEL_FORMAT_BGRA:
        return Fourcc(RGB4);
      case PIXEL_FORMAT_I420:
        return Fourcc(YU12);
      case PIXEL_FORMAT_YV12:
        return Fourcc(YV12);
      case PIXEL_FORMAT_YUY2:
        return Fourcc(YUYV);
      case PIXEL_FORMAT_NV12:
        return Fourcc(NV12);
      case PIXEL_FORMAT_NV21:
        return Fourcc(NV21);
      case PIXEL_FORMAT_I422:
      case PIXEL_FORMAT_I420A:
      case PIXEL_FORMAT_I444:
      case PIXEL_FORMAT_RGB24:
      case PIXEL_FORMAT_MJPEG:
      case PIXEL_FORMAT_YUV420P9:
      case PIXEL_FORMAT_YUV420P10:
      case PIXEL_FORMAT_YUV422P9:
      case PIXEL_FORMAT_YUV422P10:
      case PIXEL_FORMAT_YUV444P9:
      case PIXEL_FORMAT_YUV444P10:
      case PIXEL_FORMAT_YUV420P12:
      case PIXEL_FORMAT_YUV422P12:
      case PIXEL_FORMAT_YUV444P12:
      case PIXEL_FORMAT_Y16:
      case PIXEL_FORMAT_P016LE:
      case PIXEL_FORMAT_XR30:
      case PIXEL_FORMAT_XB30:
      case PIXEL_FORMAT_UNKNOWN:
        break;
    }
  } else {
    switch (pixel_format) {
      case PIXEL_FORMAT_I420:
        return Fourcc(YM12);
      case PIXEL_FORMAT_YV12:
        return Fourcc(YM21);
      case PIXEL_FORMAT_NV12:
        return Fourcc(NM12);
      case PIXEL_FORMAT_I422:
        return Fourcc(YM16);
      case PIXEL_FORMAT_NV21:
        return Fourcc(NM21);
      case PIXEL_FORMAT_I420A:
      case PIXEL_FORMAT_I444:
      case PIXEL_FORMAT_YUY2:
      case PIXEL_FORMAT_ARGB:
      case PIXEL_FORMAT_XRGB:
      case PIXEL_FORMAT_RGB24:
      case PIXEL_FORMAT_MJPEG:
      case PIXEL_FORMAT_YUV420P9:
      case PIXEL_FORMAT_YUV420P10:
      case PIXEL_FORMAT_YUV422P9:
      case PIXEL_FORMAT_YUV422P10:
      case PIXEL_FORMAT_YUV444P9:
      case PIXEL_FORMAT_YUV444P10:
      case PIXEL_FORMAT_YUV420P12:
      case PIXEL_FORMAT_YUV422P12:
      case PIXEL_FORMAT_YUV444P12:
      case PIXEL_FORMAT_Y16:
      case PIXEL_FORMAT_ABGR:
      case PIXEL_FORMAT_XBGR:
      case PIXEL_FORMAT_P016LE:
      case PIXEL_FORMAT_XR30:
      case PIXEL_FORMAT_XB30:
      case PIXEL_FORMAT_BGRA:
      case PIXEL_FORMAT_UNKNOWN:
        break;
    }
  }
  DVLOGF(3) << "Unmapped " << VideoPixelFormatToString(pixel_format) << " for "
            << (single_planar ? "single-planar" : "multi-planar");
  return base::nullopt;
}

VideoPixelFormat Fourcc::ToVideoPixelFormat() const {
  switch (value_) {
    case AR24:
      return PIXEL_FORMAT_ARGB;
    case AB24:
      return PIXEL_FORMAT_ABGR;
    case XR24:
      return PIXEL_FORMAT_XRGB;
    case XB24:
      return PIXEL_FORMAT_XBGR;
    case RGB4:
      return PIXEL_FORMAT_BGRA;
    case YU12:
    case YM12:
      return PIXEL_FORMAT_I420;
    case YV12:
    case YM21:
      return PIXEL_FORMAT_YV12;
    case YUYV:
      return PIXEL_FORMAT_YUY2;
    case NV12:
    case NM12:
      return PIXEL_FORMAT_NV12;
    case NV21:
    case NM21:
      return PIXEL_FORMAT_NV21;
    case YM16:
      return PIXEL_FORMAT_I422;
    // V4L2_PIX_FMT_MT21C is only used for MT8173 hardware video decoder output
    // and should be converted by MT8173 image processor for compositor to
    // render. Since it is an intermediate format for video decoder,
    // VideoPixelFormat shall not have its mapping. However, we need to create a
    // VideoFrameLayout for the format to process the intermediate frame. Hence
    // we map V4L2_PIX_FMT_MT21C to PIXEL_FORMAT_NV12 as their layout are the
    // same.
    case MT21:
    // V4L2_PIX_FMT_MM21 is used for MT8183 hardware video decoder. It is
    // similar to V4L2_PIX_FMT_MT21C but is not compressed ; thus it can also
    // be mapped to PIXEL_FORMAT_NV12.
    case MM21:
      return PIXEL_FORMAT_NV12;
  }
  NOTREACHED() << "Unmapped Fourcc: " << ToString();
  return PIXEL_FORMAT_UNKNOWN;
}

// static
base::Optional<Fourcc> Fourcc::FromV4L2PixFmt(uint32_t v4l2_pix_fmt) {
  // We can do that because we adopt the same internal definition of Fourcc as
  // V4L2.
  return FromUint32(v4l2_pix_fmt);
}

uint32_t Fourcc::ToV4L2PixFmt() const {
  // Note that we can do that because we adopt the same internal definition of
  // Fourcc as V4L2.
  return static_cast<uint32_t>(value_);
}

base::Optional<Fourcc> Fourcc::ToSinglePlanar() const {
  switch (value_) {
    case AR24:
    case AB24:
    case XR24:
    case XB24:
    case RGB4:
    case YU12:
    case YV12:
    case YUYV:
    case NV12:
    case NV21:
      return Fourcc(value_);
    case YM12:
      return Fourcc(YU12);
    case YM21:
      return Fourcc(YV12);
    case NM12:
      return Fourcc(NV12);
    case NM21:
      return Fourcc(NV21);
    case YM16:
    case MT21:
    case MM21:
      return base::nullopt;
  }
}

bool operator!=(const Fourcc& lhs, const Fourcc& rhs) {
  return !(lhs == rhs);
}

bool Fourcc::IsMultiPlanar() const {
  switch (value_) {
    case AR24:
    case AB24:
    case XR24:
    case XB24:
    case RGB4:
    case YU12:
    case YV12:
    case YUYV:
    case NV12:
    case NV21:
      return false;
    case YM12:
    case YM21:
    case NM12:
    case NM21:
    case YM16:
    case MT21:
    case MM21:
      return true;
  }
}

std::string Fourcc::ToString() const {
  return FourccToString(static_cast<uint32_t>(value_));
}

static_assert(Fourcc::AR24 == V4L2_PIX_FMT_ABGR32, "Mismatch Fourcc");
#ifdef V4L2_PIX_FMT_RGBA32
// V4L2_PIX_FMT_RGBA32 is defined since v5.2
static_assert(Fourcc::AB24 == V4L2_PIX_FMT_RGBA32, "Mismatch Fourcc");
#endif  // V4L2_PIX_FMT_RGBA32
static_assert(Fourcc::XR24 == V4L2_PIX_FMT_XBGR32, "Mismatch Fourcc");
#ifdef V4L2_PIX_FMT_RGBX32
// V4L2_PIX_FMT_RGBX32 is defined since v5.2
static_assert(Fourcc::XB24 == V4L2_PIX_FMT_RGBX32, "Mismatch Fourcc");
#endif  // V4L2_PIX_FMT_RGBX32
static_assert(Fourcc::RGB4 == V4L2_PIX_FMT_RGB32, "Mismatch Fourcc");
static_assert(Fourcc::YU12 == V4L2_PIX_FMT_YUV420, "Mismatch Fourcc");
static_assert(Fourcc::YV12 == V4L2_PIX_FMT_YVU420, "Mismatch Fourcc");
static_assert(Fourcc::YM12 == V4L2_PIX_FMT_YUV420M, "Mismatch Fourcc");
static_assert(Fourcc::YM21 == V4L2_PIX_FMT_YVU420M, "Mismatch Fourcc");
static_assert(Fourcc::YUYV == V4L2_PIX_FMT_YUYV, "Mismatch Fourcc");
static_assert(Fourcc::NV12 == V4L2_PIX_FMT_NV12, "Mismatch Fourcc");
static_assert(Fourcc::NV21 == V4L2_PIX_FMT_NV21, "Mismatch Fourcc");
static_assert(Fourcc::NM12 == V4L2_PIX_FMT_NV12M, "Mismatch Fourcc");
static_assert(Fourcc::NM21 == V4L2_PIX_FMT_NV21M, "Mismatch Fourcc");
static_assert(Fourcc::YM16 == V4L2_PIX_FMT_YUV422M, "Mismatch Fourcc");
static_assert(Fourcc::MT21 == V4L2_PIX_FMT_MT21C, "Mismatch Fourcc");
#ifdef V4L2_PIX_FMT_MM21
// V4L2_PIX_FMT_MM21 is not yet upstreamed.
static_assert(Fourcc::MM21 == V4L2_PIX_FMT_MM21, "Mismatch Fourcc");
#endif  // V4L2_PIX_FMT_MM21
}  // namespace media