diff options
Diffstat (limited to 'common/ih264_trans_data.c')
| -rw-r--r-- | common/ih264_trans_data.c | 100 |
1 files changed, 30 insertions, 70 deletions
diff --git a/common/ih264_trans_data.c b/common/ih264_trans_data.c index a1231e6..4a1a01f 100644 --- a/common/ih264_trans_data.c +++ b/common/ih264_trans_data.c @@ -17,67 +17,35 @@ ***************************************************************************** * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore */ + /** - ******************************************************************************* - * @file - * ih264_trans_data.c - * - * @brief - * Contains definition of global variables for H264 encoder - * - * @author - * Ittiam - * - * @remarks - * - ******************************************************************************* - */ +******************************************************************************* +* @file +* ih264_trans_data.c +* +* @brief +* Contains definition of global variables for H264 encoder +* +* @author +* ittiam +* +* @remarks +* +******************************************************************************* +*/ + +/*****************************************************************************/ +/* File Includes */ +/*****************************************************************************/ +/* User Include Files */ #include "ih264_typedefs.h" #include "ih264_trans_data.h" /*****************************************************************************/ -/* Extern global definitions */ +/* Global definitions */ /*****************************************************************************/ -/* - * Since we don't have a division operation in neon - * we will multiply by LCM of 16,6,10 and scale accordingly - * so care that to get the actual transform you need to divide by LCM - * LCM = 240 - */ - -const UWORD16 g_scal_coff_h264_4x4[16] ={ - 15,40,40,40, - 40,24,40,24, - 15,40,40,15, - 40,24,40,24}; - - - -const UWORD16 g_scal_coff_h264_8x8[16]= - { - 16, 15, 20, 15, - 15, 14, 19, 14, - 20, 19, 25, 19, - 15, 14, 19, 14 - }; -/* - * The scaling is by an 8x8 matrix, but due its 4x4 symmetry we can use - * a 4x4 matrix for scaling - * now since divide is to be avoided, we will compute 1/ values and scale it up - * to preserve information since our data is max 10 bit +1 sign bit we can shift a maximum of 21 bits up - * hence multiply the matrix as such -{16.000 15.059 20.227 15.059 -15.059 14.173 19.051 14.173 -20.227 19.051 25.600 19.051 -15.059 14.173 19.051 14.173}; -{512, 544, 405, 544, -544, 578, 430, 578, -405, 430, 320, 430, -544, 578, 430, 578};*/ - - /** ****************************************************************************** * @brief Scale Table for quantizing 4x4 subblock. To quantize a given 4x4 DCT @@ -123,7 +91,6 @@ const UWORD16 gu2_quant_scale_matrix_4x4[96] = 4559, 2893, 4559, 2893, 7282, 4559, 7282, 4559, 4559, 2893, 4559, 2893, - }; /** @@ -148,19 +115,18 @@ const UWORD16 gu2_quant_scale_matrix_4x4[96] = 174762, 349525, 699050, 1398101, 2796202, } - * * round factor constructed by setting a = 0.49 - *{ - 16056, 32112, 64225, - 128450, 256901, 513802, - 1027604, 2055208, 4110417, - }; - - * round factor constructed by setting a = 0.5 + { + 16056, 32112, 64225, + 128450, 256901, 513802, + 1027604, 2055208, 4110417, + } + * round factor constructed by setting a = 0.5 + { 16384, 32768, 65536, 131072, 262144, 524288, - 1048576, 2097152, 4194304, - + 1048576, 2097152, 4194304, + } ****************************************************************************** */ const UWORD32 gu4_forward_quant_round_factor_4x4[9] = @@ -170,8 +136,6 @@ const UWORD32 gu4_forward_quant_round_factor_4x4[9] = 2796202, }; - - /** ****************************************************************************** * @brief Threshold Table. Quantizing the given DCT coefficient is done only if @@ -286,17 +250,13 @@ const UWORD16 gu2_quant_scale_matrix_8x8 [384] = 6830, 6428, 8640, 6428, 6830, 6428, 8640, 6428, 9118, 8640, 11570, 8640, 9118, 8640, 11570, 8640, 6830, 6428, 8640, 6428, 6830, 6428, 8640, 6428, - }; - /** ****************************************************************************** * @brief Specification of QPc as a function of qPi - * * input : qp luma * output : qp chroma. - * * @remarks Refer Table 8-15 of h264 specification. ****************************************************************************** */ |