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1 /* | 1 /* |
2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2015 The WebRTC Project Authors. All rights reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #include "webrtc/rtc_base/bitbuffer.h" | 11 #include "webrtc/base/bitbuffer.h" |
12 | 12 |
13 #include <algorithm> | 13 #include <algorithm> |
14 #include <limits> | 14 #include <limits> |
15 | 15 |
16 #include "webrtc/rtc_base/checks.h" | 16 #include "webrtc/base/checks.h" |
17 | 17 |
18 namespace { | 18 namespace { |
19 | 19 |
20 // Returns the lowest (right-most) |bit_count| bits in |byte|. | 20 // Returns the lowest (right-most) |bit_count| bits in |byte|. |
21 uint8_t LowestBits(uint8_t byte, size_t bit_count) { | 21 uint8_t LowestBits(uint8_t byte, size_t bit_count) { |
22 RTC_DCHECK_LE(bit_count, 8); | 22 RTC_DCHECK_LE(bit_count, 8); |
23 return byte & ((1 << bit_count) - 1); | 23 return byte & ((1 << bit_count) - 1); |
24 } | 24 } |
25 | 25 |
26 // Returns the highest (left-most) |bit_count| bits in |byte|, shifted to the | 26 // Returns the highest (left-most) |bit_count| bits in |byte|, shifted to the |
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301 return WriteExponentialGolomb((signed_val * 2) - 1); | 301 return WriteExponentialGolomb((signed_val * 2) - 1); |
302 } else { | 302 } else { |
303 if (val == std::numeric_limits<int32_t>::min()) | 303 if (val == std::numeric_limits<int32_t>::min()) |
304 return false; // Not supported, would cause overflow. | 304 return false; // Not supported, would cause overflow. |
305 uint32_t signed_val = -val; | 305 uint32_t signed_val = -val; |
306 return WriteExponentialGolomb(signed_val * 2); | 306 return WriteExponentialGolomb(signed_val * 2); |
307 } | 307 } |
308 } | 308 } |
309 | 309 |
310 } // namespace rtc | 310 } // namespace rtc |
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