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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /media/libvpx/vp9/encoder/vp9_write_bit_buffer.c | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'media/libvpx/vp9/encoder/vp9_write_bit_buffer.c')
-rw-r--r-- | media/libvpx/vp9/encoder/vp9_write_bit_buffer.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/media/libvpx/vp9/encoder/vp9_write_bit_buffer.c b/media/libvpx/vp9/encoder/vp9_write_bit_buffer.c new file mode 100644 index 000000000..6d55e84e8 --- /dev/null +++ b/media/libvpx/vp9/encoder/vp9_write_bit_buffer.c @@ -0,0 +1,35 @@ +/* + * 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 <limits.h> +#include "vp9/encoder/vp9_write_bit_buffer.h" + +size_t vp9_wb_bytes_written(const 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); +} |