2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved.
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.
13 #include "./bitwriter_buffer.h"
15 size_t vp9_wb_bytes_written(const struct vp9_write_bit_buffer *wb) {
16 return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0);
19 void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) {
20 const int off = (int)wb->bit_offset;
21 const int p = off / CHAR_BIT;
22 const int q = CHAR_BIT - 1 - off % CHAR_BIT;
23 if (q == CHAR_BIT -1) {
24 wb->bit_buffer[p] = bit << q;
26 wb->bit_buffer[p] &= ~(1 << q);
27 wb->bit_buffer[p] |= bit << q;
29 wb->bit_offset = off + 1;
32 void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb, int data, int bits) {
34 for (bit = bits - 1; bit >= 0; bit--)
35 vp9_wb_write_bit(wb, (data >> bit) & 1);