df037b615f
The API is not final yet and can be changed. Actual layout of uncompressed frame part will be finalized later. Right now moving clr_type, error_resilient_mode, refresh_frame_context, frame_parallel_decoding_mode from first compressed partition to uncompressed frame part. Change-Id: I3afc5d4ea92c5a114f4c3d88f96858cccc15b76e
36 lines
1.0 KiB
C
36 lines
1.0 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.
|
|
*/
|
|
|
|
#ifndef VP9_READ_BIT_BUFFER_
|
|
#define VP9_READ_BIT_BUFFER_
|
|
|
|
struct vp9_read_bit_buffer {
|
|
const uint8_t *const bit_buffer;
|
|
size_t bit_offset;
|
|
};
|
|
|
|
static int vp9_rb_read_bit(struct vp9_read_bit_buffer *rb) {
|
|
const int off = rb->bit_offset;
|
|
const int p = off / CHAR_BIT;
|
|
const int q = /*CHAR_BIT - 1 -*/ off % CHAR_BIT;
|
|
const int bit = (rb->bit_buffer[p] & (1 << q)) >> q;
|
|
rb->bit_offset = off + 1;
|
|
return bit;
|
|
}
|
|
|
|
static int vp9_rb_read_literal(struct vp9_read_bit_buffer *rb, int bits) {
|
|
int value = 0, bit;
|
|
for (bit = bits - 1; bit >= 0; bit--)
|
|
value |= vp9_rb_read_bit(rb) << bit;
|
|
return value;
|
|
}
|
|
|
|
#endif // VP9_READ_BIT_BUFFER_
|