diff options
Diffstat (limited to 'vp9/encoder/vp9_write_bit_buffer.h')
-rw-r--r-- | vp9/encoder/vp9_write_bit_buffer.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/vp9/encoder/vp9_write_bit_buffer.h b/vp9/encoder/vp9_write_bit_buffer.h new file mode 100644 index 000000000..88da236d0 --- /dev/null +++ b/vp9/encoder/vp9_write_bit_buffer.h @@ -0,0 +1,38 @@ +/* + * 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_BIT_WRITE_BUFFER_H_ +#define VP9_BIT_WRITE_BUFFER_H_ + +#include "vpx/vpx_integer.h" + +struct vp9_write_bit_buffer { + uint8_t *const bit_buffer; + size_t bit_offset; +}; + +static void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) { + const int off = wb->bit_offset; + const int p = off / CHAR_BIT; + const int q = /*CHAR_BIT - 1 -*/ off % CHAR_BIT; + wb->bit_buffer[p] &= ~(1 << q); + wb->bit_buffer[p] |= bit << q; + wb->bit_offset = off + 1; +} + +static 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); +} + + +#endif // VP9_BIT_WRITE_BUFFER_H_ |