v4l2_macros.h

/*
 * Copyright 2022 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef V4L2_MACROS_H
#define V4L2_MACROS_H

#include <linux/videodev2.h>
#include <stdio.h>
#include <stdlib.h>

#define FOURCC_SIZE 4

enum logging_levels {
  kLoggingDebug = -1,
  kLoggingInfo = 0,
  kLoggingError,
  kLoggingFatal,
  kLoggingLevelMax
};

#define DEFAULT_LOG_LEVEL kLoggingInfo

#define LOG(level, stream, fmt, ...)       \
  do {                                     \
    if (level >= DEFAULT_LOG_LEVEL) {      \
      fprintf(stream, fmt, ##__VA_ARGS__); \
      fprintf(stream, "\n");               \
      fflush(stream);                      \
    }                                      \
  } while (0)

#define LOG_DEBUG(fmt, ...) LOG(kLoggingDebug, stderr, fmt, ##__VA_ARGS__)
#define LOG_INFO(fmt, ...) LOG(kLoggingInfo, stderr, fmt, ##__VA_ARGS__)
#define LOG_ERROR(fmt, ...) LOG(kLoggingError, stderr, fmt, ##__VA_ARGS__)
#define LOG_FATAL(fmt, ...)                         \
  do {                                              \
    LOG(kLoggingFatal, stderr, fmt, ##__VA_ARGS__); \
    exit(EXIT_FAILURE);                             \
  } while (0)

// TODO(frkoenig):
// P010 had not landed as an official V4L2 format yet. Once it has remove this.
#ifndef V4L2_PIX_FMT_P010
#define V4L2_PIX_FMT_P010 \
  v4l2_fourcc('P', '0', '1', '0') /* 15  Y/CbCr 4:2:0 10-bit per pixel*/
#endif
// Only available in kernels 5.4 and later.
#ifndef V4L2_PIX_FMT_NV12_UBWC
#define V4L2_PIX_FMT_NV12_UBWC \
  v4l2_fourcc('Q', '1', '2', '8') /* UBWC 8-bit Y/CbCr 4:2:0  */
#endif

#define V4L2_PIX_FMT_INVALID 0

#endif  // V4L2_MACROS_H