35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2013 The WebM project authors. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Use of this source code is governed by a BSD-style license
|
||
|
|
* that can be found in the LICENSE file in the root of the source
|
||
|
|
* tree. An additional intellectual property rights grant can be found
|
||
|
|
* in the file PATENTS. All contributing project authors may
|
||
|
|
* be found in the AUTHORS file in the root of the source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "vp9/encoder/vp9_write_bit_buffer.h"
|
||
|
|
|
||
|
|
size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb) {
|
||
|
|
return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) {
|
||
|
|
const int off = (int)wb->bit_offset;
|
||
|
|
const int p = off / CHAR_BIT;
|
||
|
|
const int q = CHAR_BIT - 1 - off % CHAR_BIT;
|
||
|
|
if (q == CHAR_BIT -1) {
|
||
|
|
wb->bit_buffer[p] = bit << q;
|
||
|
|
} else {
|
||
|
|
wb->bit_buffer[p] &= ~(1 << q);
|
||
|
|
wb->bit_buffer[p] |= bit << q;
|
||
|
|
}
|
||
|
|
wb->bit_offset = off + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb, int data, int bits) {
|
||
|
|
int bit;
|
||
|
|
for (bit = bits - 1; bit >= 0; bit--)
|
||
|
|
vp9_wb_write_bit(wb, (data >> bit) & 1);
|
||
|
|
}
|