bitwriter.h (2898B)
1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AOM_DSP_BITWRITER_H_ 13 #define AOM_AOM_DSP_BITWRITER_H_ 14 15 #include <assert.h> 16 17 #include "config/aom_config.h" 18 19 #include "aom_dsp/entenc.h" 20 #include "aom_dsp/prob.h" 21 22 #if CONFIG_RD_DEBUG 23 #include "av1/common/blockd.h" 24 #include "av1/encoder/cost.h" 25 #endif 26 27 #if CONFIG_BITSTREAM_DEBUG 28 #include "aom_util/debug_util.h" 29 #endif // CONFIG_BITSTREAM_DEBUG 30 31 #ifdef __cplusplus 32 extern "C" { 33 #endif 34 35 struct aom_writer { 36 unsigned int pos; 37 uint8_t *buffer; 38 od_ec_enc ec; 39 uint8_t allow_update_cdf; 40 }; 41 42 typedef struct aom_writer aom_writer; 43 44 typedef struct TOKEN_STATS { 45 int cost; 46 #if CONFIG_RD_DEBUG 47 int txb_coeff_cost_map[TXB_COEFF_COST_MAP_SIZE][TXB_COEFF_COST_MAP_SIZE]; 48 #endif 49 } TOKEN_STATS; 50 51 static inline void init_token_stats(TOKEN_STATS *token_stats) { 52 #if CONFIG_RD_DEBUG 53 int r, c; 54 for (r = 0; r < TXB_COEFF_COST_MAP_SIZE; ++r) { 55 for (c = 0; c < TXB_COEFF_COST_MAP_SIZE; ++c) { 56 token_stats->txb_coeff_cost_map[r][c] = 0; 57 } 58 } 59 #endif 60 token_stats->cost = 0; 61 } 62 63 void aom_start_encode(aom_writer *w, uint8_t *buffer); 64 65 // Returns a negative number on error. Caller must check the return value and 66 // handle error. 67 int aom_stop_encode(aom_writer *w); 68 69 int aom_tell_size(aom_writer *w); 70 71 static inline void aom_write(aom_writer *w, int bit, int probability) { 72 int p = (0x7FFFFF - (probability << 15) + probability) >> 8; 73 #if CONFIG_BITSTREAM_DEBUG 74 aom_cdf_prob cdf[2] = { (aom_cdf_prob)p, 32767 }; 75 bitstream_queue_push(bit, cdf, 2); 76 #endif 77 78 od_ec_encode_bool_q15(&w->ec, bit, p); 79 } 80 81 static inline void aom_write_bit(aom_writer *w, int bit) { 82 aom_write(w, bit, 128); // aom_prob_half 83 } 84 85 static inline void aom_write_literal(aom_writer *w, int data, int bits) { 86 int bit; 87 88 for (bit = bits - 1; bit >= 0; bit--) aom_write_bit(w, 1 & (data >> bit)); 89 } 90 91 static inline void aom_write_cdf(aom_writer *w, int symb, 92 const aom_cdf_prob *cdf, int nsymbs) { 93 #if CONFIG_BITSTREAM_DEBUG 94 bitstream_queue_push(symb, cdf, nsymbs); 95 #endif 96 97 od_ec_encode_cdf_q15(&w->ec, symb, cdf, nsymbs); 98 } 99 100 static inline void aom_write_symbol(aom_writer *w, int symb, aom_cdf_prob *cdf, 101 int nsymbs) { 102 aom_write_cdf(w, symb, cdf, nsymbs); 103 if (w->allow_update_cdf) update_cdf(cdf, symb, nsymbs); 104 } 105 106 #ifdef __cplusplus 107 } // extern "C" 108 #endif 109 110 #endif // AOM_AOM_DSP_BITWRITER_H_