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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "media/base/bit_reader_core.h" | 5 #include "media/base/bit_reader_core.h" |
6 | 6 |
7 #include <stdint.h> | 7 #include <stdint.h> |
8 | 8 |
9 #include "base/sys_byteorder.h" | 9 #include "base/sys_byteorder.h" |
10 | 10 |
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79 reg_next_ = 0; | 79 reg_next_ = 0; |
80 | 80 |
81 // Next, skip an integer number of bytes. | 81 // Next, skip an integer number of bytes. |
82 const int nbytes = num_bits / 8; | 82 const int nbytes = num_bits / 8; |
83 if (nbytes > 0) { | 83 if (nbytes > 0) { |
84 const uint8_t* byte_stream_window; | 84 const uint8_t* byte_stream_window; |
85 const int window_size = | 85 const int window_size = |
86 byte_stream_provider_->GetBytes(nbytes, &byte_stream_window); | 86 byte_stream_provider_->GetBytes(nbytes, &byte_stream_window); |
87 DCHECK_GE(window_size, 0); | 87 DCHECK_GE(window_size, 0); |
88 DCHECK_LE(window_size, nbytes); | 88 DCHECK_LE(window_size, nbytes); |
89 if (window_size < nbytes) | 89 if (window_size < nbytes) { |
| 90 // Note that some bytes were consumed. |
| 91 bits_read_ += 8 * window_size; |
90 return false; | 92 return false; |
| 93 } |
91 num_bits -= 8 * nbytes; | 94 num_bits -= 8 * nbytes; |
92 bits_read_ += 8 * nbytes; | 95 bits_read_ += 8 * nbytes; |
93 } | 96 } |
94 | 97 |
95 // Skip the remaining bits. | 98 // Skip the remaining bits. |
96 return SkipBitsSmall(num_bits); | 99 return SkipBitsSmall(num_bits); |
97 } | 100 } |
98 | 101 |
99 int BitReaderCore::bits_read() const { | 102 int BitReaderCore::bits_read() const { |
100 return bits_read_; | 103 return bits_read_; |
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181 nbits_next_ = 0; | 184 nbits_next_ = 0; |
182 return; | 185 return; |
183 } | 186 } |
184 | 187 |
185 nbits_ += free_nbits; | 188 nbits_ += free_nbits; |
186 reg_next_ <<= free_nbits; | 189 reg_next_ <<= free_nbits; |
187 nbits_next_ -= free_nbits; | 190 nbits_next_ -= free_nbits; |
188 } | 191 } |
189 | 192 |
190 } // namespace media | 193 } // namespace media |
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