OLD | NEW |
1 // Copyright 2015 The Chromium Authors. All rights reserved. | 1 // Copyright 2015 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 #ifndef MEDIA_BLINK_MULTIBUFFER_H_ | 5 #ifndef MEDIA_BLINK_MULTIBUFFER_H_ |
6 #define MEDIA_BLINK_MULTIBUFFER_H_ | 6 #define MEDIA_BLINK_MULTIBUFFER_H_ |
7 | 7 |
8 #include <stddef.h> | 8 #include <stddef.h> |
9 #include <stdint.h> | 9 #include <stdint.h> |
10 | 10 |
11 #include <limits> | 11 #include <limits> |
12 #include <map> | 12 #include <map> |
13 #include <set> | 13 #include <set> |
14 #include <vector> | 14 #include <vector> |
15 | 15 |
16 #include "base/callback.h" | 16 #include "base/callback.h" |
17 #include "base/containers/hash_tables.h" | 17 #include "base/containers/hash_tables.h" |
| 18 #include "base/hash.h" |
18 #include "base/macros.h" | 19 #include "base/macros.h" |
19 #include "base/memory/ref_counted.h" | 20 #include "base/memory/ref_counted.h" |
20 #include "base/memory/scoped_ptr.h" | 21 #include "base/memory/scoped_ptr.h" |
21 #include "build/build_config.h" | 22 #include "build/build_config.h" |
22 #include "media/base/data_buffer.h" | 23 #include "media/base/data_buffer.h" |
23 #include "media/blink/interval_map.h" | 24 #include "media/blink/interval_map.h" |
24 #include "media/blink/lru.h" | 25 #include "media/blink/lru.h" |
25 #include "media/blink/media_blink_export.h" | 26 #include "media/blink/media_blink_export.h" |
26 | 27 |
27 namespace media { | 28 namespace media { |
28 | 29 |
29 // Used to identify a block of data in the multibuffer. | 30 // Used to identify a block of data in the multibuffer. |
30 // Our blocks are 32kb (1 << 15), so our maximum cacheable file size | 31 // Our blocks are 32kb (1 << 15), so our maximum cacheable file size |
31 // is 1 << (15 + 31) = 64Tb | 32 // is 1 << (15 + 31) = 64Tb |
32 typedef int32_t MultiBufferBlockId; | 33 typedef int32_t MultiBufferBlockId; |
33 class MultiBuffer; | 34 class MultiBuffer; |
34 | 35 |
35 // This type is used to identify a block in the LRU, which is shared between | 36 // This type is used to identify a block in the LRU, which is shared between |
36 // multibuffers. | 37 // multibuffers. |
37 typedef std::pair<MultiBuffer*, MultiBufferBlockId> MultiBufferGlobalBlockId; | 38 typedef std::pair<MultiBuffer*, MultiBufferBlockId> MultiBufferGlobalBlockId; |
38 | 39 |
39 } // namespace media | 40 } // namespace media |
40 | 41 |
41 namespace BASE_HASH_NAMESPACE { | 42 namespace BASE_HASH_NAMESPACE { |
42 | 43 |
43 template <> | 44 template <> |
44 struct hash<media::MultiBufferGlobalBlockId> { | 45 struct hash<media::MultiBufferGlobalBlockId> { |
45 std::size_t operator()(const media::MultiBufferGlobalBlockId& key) const { | 46 std::size_t operator()(const media::MultiBufferGlobalBlockId& key) const { |
46 // It would be nice if we could use intptr_t instead of int64_t here, but | 47 return base::HashInts(reinterpret_cast<uintptr_t>(key.first), key.second); |
47 // on some platforms, int64_t is declared as "long" which doesn't match | |
48 // any of the HashPair() functions. This leads to a compile error since | |
49 // the compiler can't decide which HashPair() function to call. | |
50 #if defined(ARCH_CPU_64_BITS) | |
51 return base::HashPair(reinterpret_cast<int64_t>(key.first), key.second); | |
52 #else | |
53 return base::HashPair(reinterpret_cast<int32_t>(key.first), key.second); | |
54 #endif | |
55 } | 48 } |
56 }; | 49 }; |
57 | 50 |
58 } // namespace BASE_HASH_NAMESPACE | 51 } // namespace BASE_HASH_NAMESPACE |
59 | 52 |
60 namespace media { | 53 namespace media { |
61 | 54 |
62 // Freeing a lot of blocks can be expensive, to keep thing | 55 // Freeing a lot of blocks can be expensive, to keep thing |
63 // flowing smoothly we only free a maximum of |kMaxFreesPerAdd| | 56 // flowing smoothly we only free a maximum of |kMaxFreesPerAdd| |
64 // blocks when a new block is added to the cache. | 57 // blocks when a new block is added to the cache. |
(...skipping 253 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
318 // and 0 for all blocks that are not. Used to quickly figure out | 311 // and 0 for all blocks that are not. Used to quickly figure out |
319 // ranges of available/unavailable blocks without iterating. | 312 // ranges of available/unavailable blocks without iterating. |
320 IntervalMap<BlockId, int32_t> present_; | 313 IntervalMap<BlockId, int32_t> present_; |
321 | 314 |
322 DISALLOW_COPY_AND_ASSIGN(MultiBuffer); | 315 DISALLOW_COPY_AND_ASSIGN(MultiBuffer); |
323 }; | 316 }; |
324 | 317 |
325 } // namespace media | 318 } // namespace media |
326 | 319 |
327 #endif // MEDIA_BLINK_MULTIBUFFER_H_ | 320 #endif // MEDIA_BLINK_MULTIBUFFER_H_ |
OLD | NEW |