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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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/seekable_buffer.h" | 5 #include "media/base/seekable_buffer.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/logging.h" | 9 #include "base/logging.h" |
10 #include "media/base/data_buffer.h" | 10 #include "media/base/data_buffer.h" |
11 #include "media/base/timestamp_constants.h" | 11 #include "media/base/timestamp_constants.h" |
12 | 12 |
13 namespace media { | 13 namespace media { |
14 | 14 |
15 SeekableBuffer::SeekableBuffer(int backward_capacity, int forward_capacity) | 15 SeekableBuffer::SeekableBuffer(int backward_capacity, int forward_capacity) |
16 : current_buffer_offset_(0), | 16 : current_buffer_offset_(0), |
17 backward_capacity_(backward_capacity), | 17 backward_capacity_(backward_capacity), |
18 backward_bytes_(0), | 18 backward_bytes_(0), |
19 forward_capacity_(forward_capacity), | 19 forward_capacity_(forward_capacity), |
20 forward_bytes_(0), | 20 forward_bytes_(0), |
21 current_time_(kNoTimestamp()) { | 21 current_time_(kNoTimestamp) { |
22 current_buffer_ = buffers_.begin(); | 22 current_buffer_ = buffers_.begin(); |
23 } | 23 } |
24 | 24 |
25 SeekableBuffer::~SeekableBuffer() { | 25 SeekableBuffer::~SeekableBuffer() { |
26 } | 26 } |
27 | 27 |
28 void SeekableBuffer::Clear() { | 28 void SeekableBuffer::Clear() { |
29 buffers_.clear(); | 29 buffers_.clear(); |
30 current_buffer_ = buffers_.begin(); | 30 current_buffer_ = buffers_.begin(); |
31 current_buffer_offset_ = 0; | 31 current_buffer_offset_ = 0; |
32 backward_bytes_ = 0; | 32 backward_bytes_ = 0; |
33 forward_bytes_ = 0; | 33 forward_bytes_ = 0; |
34 current_time_ = kNoTimestamp(); | 34 current_time_ = kNoTimestamp; |
35 } | 35 } |
36 | 36 |
37 int SeekableBuffer::Read(uint8_t* data, int size) { | 37 int SeekableBuffer::Read(uint8_t* data, int size) { |
38 DCHECK(data); | 38 DCHECK(data); |
39 return InternalRead(data, size, true, 0); | 39 return InternalRead(data, size, true, 0); |
40 } | 40 } |
41 | 41 |
42 int SeekableBuffer::Peek(uint8_t* data, int size, int forward_offset) { | 42 int SeekableBuffer::Peek(uint8_t* data, int size, int forward_offset) { |
43 DCHECK(data); | 43 DCHECK(data); |
44 return InternalRead(data, size, false, forward_offset); | 44 return InternalRead(data, size, false, forward_offset); |
45 } | 45 } |
46 | 46 |
47 bool SeekableBuffer::GetCurrentChunk(const uint8_t** data, int* size) const { | 47 bool SeekableBuffer::GetCurrentChunk(const uint8_t** data, int* size) const { |
48 BufferQueue::iterator current_buffer = current_buffer_; | 48 BufferQueue::iterator current_buffer = current_buffer_; |
49 int current_buffer_offset = current_buffer_offset_; | 49 int current_buffer_offset = current_buffer_offset_; |
50 // Advance position if we are in the end of the current buffer. | 50 // Advance position if we are in the end of the current buffer. |
51 while (current_buffer != buffers_.end() && | 51 while (current_buffer != buffers_.end() && |
52 current_buffer_offset >= (*current_buffer)->data_size()) { | 52 current_buffer_offset >= (*current_buffer)->data_size()) { |
53 ++current_buffer; | 53 ++current_buffer; |
54 current_buffer_offset = 0; | 54 current_buffer_offset = 0; |
55 } | 55 } |
56 if (current_buffer == buffers_.end()) | 56 if (current_buffer == buffers_.end()) |
57 return false; | 57 return false; |
58 *data = (*current_buffer)->data() + current_buffer_offset; | 58 *data = (*current_buffer)->data() + current_buffer_offset; |
59 *size = (*current_buffer)->data_size() - current_buffer_offset; | 59 *size = (*current_buffer)->data_size() - current_buffer_offset; |
60 return true; | 60 return true; |
61 } | 61 } |
62 | 62 |
63 bool SeekableBuffer::Append(const scoped_refptr<DataBuffer>& buffer_in) { | 63 bool SeekableBuffer::Append(const scoped_refptr<DataBuffer>& buffer_in) { |
64 if (buffers_.empty() && buffer_in->timestamp() != kNoTimestamp()) { | 64 if (buffers_.empty() && buffer_in->timestamp() != kNoTimestamp) { |
65 current_time_ = buffer_in->timestamp(); | 65 current_time_ = buffer_in->timestamp(); |
66 } | 66 } |
67 | 67 |
68 // Since the forward capacity is only used to check the criteria for buffer | 68 // Since the forward capacity is only used to check the criteria for buffer |
69 // full, we always append data to the buffer. | 69 // full, we always append data to the buffer. |
70 buffers_.push_back(buffer_in); | 70 buffers_.push_back(buffer_in); |
71 | 71 |
72 // After we have written the first buffer, update |current_buffer_| to point | 72 // After we have written the first buffer, update |current_buffer_| to point |
73 // to it. | 73 // to it. |
74 if (current_buffer_ == buffers_.end()) { | 74 if (current_buffer_ == buffers_.end()) { |
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259 UpdateCurrentTime(current_buffer_, current_buffer_offset_); | 259 UpdateCurrentTime(current_buffer_, current_buffer_offset_); |
260 EvictBackwardBuffers(); | 260 EvictBackwardBuffers(); |
261 } | 261 } |
262 | 262 |
263 return taken; | 263 return taken; |
264 } | 264 } |
265 | 265 |
266 void SeekableBuffer::UpdateCurrentTime(BufferQueue::iterator buffer, | 266 void SeekableBuffer::UpdateCurrentTime(BufferQueue::iterator buffer, |
267 int offset) { | 267 int offset) { |
268 // Garbage values are unavoidable, so this check will remain. | 268 // Garbage values are unavoidable, so this check will remain. |
269 if (buffer != buffers_.end() && | 269 if (buffer != buffers_.end() && (*buffer)->timestamp() != kNoTimestamp) { |
270 (*buffer)->timestamp() != kNoTimestamp()) { | |
271 int64_t time_offset = ((*buffer)->duration().InMicroseconds() * offset) / | 270 int64_t time_offset = ((*buffer)->duration().InMicroseconds() * offset) / |
272 (*buffer)->data_size(); | 271 (*buffer)->data_size(); |
273 | 272 |
274 current_time_ = (*buffer)->timestamp() + | 273 current_time_ = (*buffer)->timestamp() + |
275 base::TimeDelta::FromMicroseconds(time_offset); | 274 base::TimeDelta::FromMicroseconds(time_offset); |
276 } | 275 } |
277 } | 276 } |
278 | 277 |
279 } // namespace media | 278 } // namespace media |
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