The Tor Browser / file comparison
comparison: media/libvpx/vp9/encoder/vp9_write_bit_buffer.h
media/libvpx/vp9/encoder/vp9_write_bit_buffer.h
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:598217d12c6f |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2013 The WebM project authors. All Rights Reserved. | |
| 3 * | |
| 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. | |
| 9 */ | |
| 10 | |
| 11 #ifndef VP9_BIT_WRITE_BUFFER_H_ | |
| 12 #define VP9_BIT_WRITE_BUFFER_H_ | |
| 13 | |
| 14 #include <limits.h> | |
| 15 | |
| 16 #include "vpx/vpx_integer.h" | |
| 17 | |
| 18 struct vp9_write_bit_buffer { | |
| 19 uint8_t *bit_buffer; | |
| 20 size_t bit_offset; | |
| 21 }; | |
| 22 | |
| 23 static size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb) { | |
| 24 return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0); | |
| 25 } | |
| 26 | |
| 27 static void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) { | |
| 28 const int off = wb->bit_offset; | |
| 29 const int p = off / CHAR_BIT; | |
| 30 const int q = CHAR_BIT - 1 - off % CHAR_BIT; | |
| 31 if (q == CHAR_BIT -1) { | |
| 32 wb->bit_buffer[p] = bit << q; | |
| 33 } else { | |
| 34 wb->bit_buffer[p] &= ~(1 << q); | |
| 35 wb->bit_buffer[p] |= bit << q; | |
| 36 } | |
| 37 wb->bit_offset = off + 1; | |
| 38 } | |
| 39 | |
| 40 static void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb, | |
| 41 int data, int bits) { | |
| 42 int bit; | |
| 43 for (bit = bits - 1; bit >= 0; bit--) | |
| 44 vp9_wb_write_bit(wb, (data >> bit) & 1); | |
| 45 } | |
| 46 | |
| 47 | |
| 48 #endif // VP9_BIT_WRITE_BUFFER_H_ |
