text: /******************************************************************************
   *
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at:
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   *****************************************************************************
   * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
  */
  
  #ifndef _RC_COMMON_H_
  #define _RC_COMMON_H_
  
  /****************************************************************************
   NOTE : Put only those things into this file which are common across many
   files, say I_TO_P_BIT_RATIO macro is used across irc_bit_allocation.c
   and irc_rate_control_api.c.If anything is exclusive only to one file,
   define it in the same file
  
   This file is an RC private file. It should not be exported to Codec
   ****************************************************************************/
  
  #define UNUSED(x) ((void)(x))
  
  typedef float number_t;
  
  #define mult32_var_q(a,b,c) *c = a * b
  
  #define div32_var_q(a,b,c) (*c = ((b == 0)? a : (a / b)))
  
  #define add32_var_q(a,b,c) *c = a + b
  
  #define sub32_var_q(a,b,c) *c = a - b
  
  #define sqrt32_var_q(a, c) *c = sqrt(a)
  
  #define number_t_to_word32(num_a, a) *a = (WORD32)num_a
  
  #define convert_float_to_fix(a_f, a) *a = (WORD32)a_f
  
  #define convert_fix_to_float(a, a_f) *a_f = (float) a
  
  #define SET_VAR_Q(a,b,c) {a = (float) b;}
  
  
  /* Defines the maximum and the minimum quantizer allowed in the stream.*/
  #define MAX_MPEG2_QP        255 /* 127*/
  
  /* Bits ratio between I and P frame */
  #define I_TO_P_BIT_RATIO 5
  
  /* Calculates P = (X*Y/Z) (Assuming all the four are in integers)*/
  #define X_PROD_Y_DIV_Z(X1,Y1,Z1,P1)\
  {\
      number_t vq_a,vq_b,vq_c;\
      SET_VAR_Q(vq_a,(X1),0);\
      SET_VAR_Q(vq_b,(Y1),0);\
      SET_VAR_Q(vq_c,(Z1),0);\
      mult32_var_q(vq_a,vq_b,&vq_a);\
      div32_var_q(vq_a,vq_c,&vq_a);\
      number_t_to_word32(vq_a,&(P1));\
  }
  #define VQ_A_LT_VQ_B(A,B, Z) Z = A < B;
  #define VQ_A_GT_VQ_B(A,B, Z) Z = A > B;
  
  /* Z=MAX(A,B) where A, B  and Z are var_q variables */
  #define MAX_VARQ(A,B, Z)\
  {\
      WORD32 a_gt_b;\
      VQ_A_GT_VQ_B((A), (B), a_gt_b);\
      (Z) = (a_gt_b) ? (A) : (B);\
  }
  
  /* Z=MIN(A,B) where A, B  and Z are var_q variables */
  #define MIN_VARQ(A,B, Z)\
  {\
      WORD32 a_lt_b;\
      VQ_A_LT_VQ_B((A), (B), a_lt_b);\
      (Z) = (a_lt_b) ? (A) : (B);\
  }
  
  /* Maximum number of drain-rates supported. Currently a maximum of only 2
   drain-rates supported. One for
   I pictures and the other for P & B pictures */
  #define MAX_NUM_DRAIN_RATES 2
  
  /* The ratios between I to P and P to B Qp is specified here */
  #define K_Q 4
  #define I_TO_P_RATIO (19) /* In K_Q Q factor */
  #define P_TO_B_RATIO (32) /* In K_Q Q factor */
  #define P_TO_I_RATIO (13) /* In K_Q Q factor */
  
  #endif /* _RC_COMMON_H_ */
  
  