Home | History | Annotate | Download | only in common 
      1 /*
      2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef VP9_COMMON_VP9_COMMON_H_
     12 #define VP9_COMMON_VP9_COMMON_H_
     13 
     14 /* Interface header for common constant data structures and lookup tables */
     15 
     16 #include <assert.h>
     17 
     18 #include "./vpx_config.h"
     19 #include "vpx_mem/vpx_mem.h"
     20 #include "vpx/vpx_integer.h"
     21 
     22 #define MIN(x, y) (((x) < (y)) ? (x) : (y))
     23 #define MAX(x, y) (((x) > (y)) ? (x) : (y))
     24 
     25 #define ROUND_POWER_OF_TWO(value, n) \
     26     (((value) + (1 << ((n) - 1))) >> (n))
     27 
     28 #define ALIGN_POWER_OF_TWO(value, n) \
     29     (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
     30 
     31 // Only need this for fixed-size arrays, for structs just assign.
     32 #define vp9_copy(dest, src) {            \
     33     assert(sizeof(dest) == sizeof(src)); \
     34     vpx_memcpy(dest, src, sizeof(src));  \
     35   }
     36 
     37 // Use this for variably-sized arrays.
     38 #define vp9_copy_array(dest, src, n) {       \
     39     assert(sizeof(*dest) == sizeof(*src));   \
     40     vpx_memcpy(dest, src, n * sizeof(*src)); \
     41   }
     42 
     43 #define vp9_zero(dest) vpx_memset(&dest, 0, sizeof(dest))
     44 #define vp9_zero_array(dest, n) vpx_memset(dest, 0, n * sizeof(*dest))
     45 
     46 static INLINE uint8_t clip_pixel(int val) {
     47   return (val > 255) ? 255u : (val < 0) ? 0u : val;
     48 }
     49 
     50 static INLINE int clamp(int value, int low, int high) {
     51   return value < low ? low : (value > high ? high : value);
     52 }
     53 
     54 static INLINE double fclamp(double value, double low, double high) {
     55   return value < low ? low : (value > high ? high : value);
     56 }
     57 
     58 static int get_unsigned_bits(unsigned int num_values) {
     59   int cat = 0;
     60   if (num_values <= 1)
     61     return 0;
     62   num_values--;
     63   while (num_values > 0) {
     64     cat++;
     65     num_values >>= 1;
     66   }
     67   return cat;
     68 }
     69 
     70 #if CONFIG_DEBUG
     71 #define CHECK_MEM_ERROR(cm, lval, expr) do { \
     72   lval = (expr); \
     73   if (!lval) \
     74     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR, \
     75                        "Failed to allocate "#lval" at %s:%d", \
     76                        __FILE__, __LINE__); \
     77   } while (0)
     78 #else
     79 #define CHECK_MEM_ERROR(cm, lval, expr) do { \
     80   lval = (expr); \
     81   if (!lval) \
     82     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR, \
     83                        "Failed to allocate "#lval); \
     84   } while (0)
     85 #endif
     86 
     87 #define VP9_SYNC_CODE_0 0x49
     88 #define VP9_SYNC_CODE_1 0x83
     89 #define VP9_SYNC_CODE_2 0x42
     90 
     91 #define VP9_FRAME_MARKER 0x2
     92 
     93 
     94 #endif  // VP9_COMMON_VP9_COMMON_H_
     95