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Side by Side Diff: media/base/media_format.h

Issue 18546: Implementation of Pipeline and FilterHost interfaces. This is a large change... (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: '' Created 11 years, 10 months ago
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1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2006-2008 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_BASE_MEDIA_FORMAT_H_ 5 #ifndef MEDIA_BASE_MEDIA_FORMAT_H_
6 #define MEDIA_BASE_MEDIA_FORMAT_H_ 6 #define MEDIA_BASE_MEDIA_FORMAT_H_
7 7
8 #include <map>
9 #include <string>
10
8 #include "base/values.h" 11 #include "base/values.h"
9 12
10 namespace media { 13 namespace media {
11 14
12 // Common MIME types. 15 // Common MIME types.
13 namespace mime_type { 16 namespace mime_type {
14 extern const char kURI[]; 17 extern const char kURL[];
15 extern const char kApplicationOctetStream[]; 18 extern const char kApplicationOctetStream[];
16 extern const char kMPEGAudio[]; 19 extern const char kMPEGAudio[];
17 extern const char kAACAudio[]; 20 extern const char kAACAudio[];
18 extern const char kH264AnnexB[]; 21 extern const char kH264AnnexB[];
19 extern const char kUncompressedAudio[]; 22 extern const char kUncompressedAudio[];
20 extern const char kUncompressedVideo[]; 23 extern const char kUncompressedVideo[];
24 extern const char kMajorTypeAudio[];
25 extern const char kMajorTypeVideo[];
21 } // namespace mime_type 26 } // namespace mime_type
22 27
23 // MediaFormat is used to describe the output of a MediaFilterInterface to 28 // MediaFormat is used to describe the output of a MediaFilterInterface to
24 // determine whether a downstream filter can accept the output from an upstream 29 // determine whether a downstream filter can accept the output from an upstream
25 // filter. In general, every MediaFormat contains a MIME type describing 30 // filter. In general, every MediaFormat contains a MIME type describing
26 // its output as well as additional key-values describing additional details. 31 // its output as well as additional key-values describing additional details.
27 // 32 //
28 // For example, an audio decoder could output audio/x-uncompressed and include 33 // For example, an audio decoder could output audio/x-uncompressed and include
29 // additional key-values such as the number of channels and the sample rate. 34 // additional key-values such as the number of channels and the sample rate.
30 // An audio renderer would use this information to properly initialize the 35 // An audio renderer would use this information to properly initialize the
31 // audio hardware before playback started. 36 // audio hardware before playback started.
32 // 37 //
33 // It's also perfectly acceptable to create your own MIME types and standards 38 // It's also perfectly acceptable to create your own MIME types and standards
34 // to allow communication between two filters that goes beyond the basics 39 // to allow communication between two filters that goes beyond the basics
35 // described here. For example, you could write a video decoder that outputs 40 // described here. For example, you could write a video decoder that outputs
36 // a MIME type video/x-special for which your video renderer knows it's some 41 // a MIME type video/x-special for which your video renderer knows it's some
37 // special form of decompressed video output that regular video renderers 42 // special form of decompressed video output that regular video renderers
38 // couldn't handle. 43 // couldn't handle.
39 class MediaFormat { 44 class MediaFormat {
40 public: 45 public:
41 // Common keys. 46 // Common keys.
42 static const char kMimeType[]; 47 static const char kMimeType[];
43 static const char kURI[]; 48 static const char kURL[];
44 static const char kSurfaceFormat[]; 49 static const char kSurfaceFormat[];
45 static const char kSampleRate[]; 50 static const char kSampleRate[];
46 static const char kSampleBits[]; 51 static const char kSampleBits[];
47 static const char kChannels[]; 52 static const char kChannels[];
48 static const char kWidth[]; 53 static const char kWidth[];
49 static const char kHeight[]; 54 static const char kHeight[];
50 55
51 MediaFormat(); 56 MediaFormat();
52 ~MediaFormat(); 57 ~MediaFormat();
53 58
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75 80
76 typedef std::map<std::string, Value*> ValueMap; 81 typedef std::map<std::string, Value*> ValueMap;
77 ValueMap value_map_; 82 ValueMap value_map_;
78 83
79 DISALLOW_COPY_AND_ASSIGN(MediaFormat); 84 DISALLOW_COPY_AND_ASSIGN(MediaFormat);
80 }; 85 };
81 86
82 } // namespace media 87 } // namespace media
83 88
84 #endif // MEDIA_BASE_MEDIA_FORMAT_H_ 89 #endif // MEDIA_BASE_MEDIA_FORMAT_H_
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