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Side by Side Diff: media/filters/h264_bit_reader.h

Issue 119153002: Move H264Parser and H264BitReader to media/filters. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src
Patch Set: Created 6 years, 11 months ago
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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 // This file contains an implementation of an H264 Annex-B video stream parser. 5 // This file contains an implementation of an H264 Annex-B video stream parser.
6 6
7 #ifndef CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_ 7 #ifndef MEDIA_FILTERS_H264_BIT_READER_H_
8 #define CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_ 8 #define MEDIA_FILTERS_H264_BIT_READER_H_
9 9
10 #include <sys/types.h> 10 #include <sys/types.h>
11 11
12 #include "base/basictypes.h" 12 #include "base/basictypes.h"
13 #include "content/common/content_export.h" 13 #include "media/base/media_export.h"
14 14
15 namespace content { 15 namespace media {
16 16
17 // A class to provide bit-granularity reading of H.264 streams. 17 // A class to provide bit-granularity reading of H.264 streams.
18 // This is not a generic bit reader class, as it takes into account 18 // This is not a generic bit reader class, as it takes into account
19 // H.264 stream-specific constraints, such as skipping emulation-prevention 19 // H.264 stream-specific constraints, such as skipping emulation-prevention
20 // bytes and stop bits. See spec for more details. 20 // bytes and stop bits. See spec for more details.
21 class CONTENT_EXPORT H264BitReader { 21 class MEDIA_EXPORT H264BitReader {
22 public: 22 public:
23 H264BitReader(); 23 H264BitReader();
24 ~H264BitReader(); 24 ~H264BitReader();
25 25
26 // Initialize the reader to start reading at |data|, |size| being size 26 // Initialize the reader to start reading at |data|, |size| being size
27 // of |data| in bytes. 27 // of |data| in bytes.
28 // Return false on insufficient size of stream.. 28 // Return false on insufficient size of stream..
29 // TODO(posciak,fischman): consider replacing Initialize() with 29 // TODO(posciak,fischman): consider replacing Initialize() with
30 // heap-allocating and creating bit readers on demand instead. 30 // heap-allocating and creating bit readers on demand instead.
31 bool Initialize(const uint8* data, off_t size); 31 bool Initialize(const uint8* data, off_t size);
32 32
33 // Read |num_bits| next bits from stream and return in |*out|, first bit 33 // Read |num_bits| next bits from stream and return in |*out|, first bit
34 // from the stream starting at |num_bits| position in |*out|. 34 // from the stream starting at |num_bits| position in |*out|.
35 // |num_bits| may be 1-32, inclusive. 35 // |num_bits| may be 1-32, inclusive.
36 // Return false if the given number of bits cannot be read (not enough 36 // Return false if the given number of bits cannot be read (not enough
37 // bits in the stream), true otherwise. 37 // bits in the stream), true otherwise.
38 bool ReadBits(int num_bits, int *out); 38 bool ReadBits(int num_bits, int* out);
39 39
40 // Return the number of bits left in the stream. 40 // Return the number of bits left in the stream.
41 off_t NumBitsLeft(); 41 off_t NumBitsLeft();
42 42
43 // See the definition of more_rbsp_data() in spec. 43 // See the definition of more_rbsp_data() in spec.
44 bool HasMoreRBSPData(); 44 bool HasMoreRBSPData();
45 45
46 // Return the number of emulation prevention bytes already read. 46 // Return the number of emulation prevention bytes already read.
47 size_t NumEmulationPreventionBytesRead(); 47 size_t NumEmulationPreventionBytesRead();
48 48
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67 // Used in emulation prevention three byte detection (see spec). 67 // Used in emulation prevention three byte detection (see spec).
68 // Initially set to 0xffff to accept all initial two-byte sequences. 68 // Initially set to 0xffff to accept all initial two-byte sequences.
69 int prev_two_bytes_; 69 int prev_two_bytes_;
70 70
71 // Number of emulation preventation bytes (0x000003) we met. 71 // Number of emulation preventation bytes (0x000003) we met.
72 size_t emulation_prevention_bytes_; 72 size_t emulation_prevention_bytes_;
73 73
74 DISALLOW_COPY_AND_ASSIGN(H264BitReader); 74 DISALLOW_COPY_AND_ASSIGN(H264BitReader);
75 }; 75 };
76 76
77 } // namespace content 77 } // namespace media
78 78
79 #endif // CONTENT_COMMON_GPU_MEDIA_H264_BIT_READER_H_ 79 #endif // MEDIA_FILTERS_H264_BIT_READER_H_
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