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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 // FFmpegGlue is an interface between FFmpeg and Chrome used to proxy FFmpeg's | 5 // FFmpegGlue is an interface between FFmpeg and Chrome used to proxy FFmpeg's |
6 // read and seek requests to Chrome's internal data structures. The glue works | 6 // read and seek requests to Chrome's internal data structures. The glue works |
7 // through the AVIO interface provided by FFmpeg. | 7 // through the AVIO interface provided by FFmpeg. |
8 // | 8 // |
9 // AVIO works through a special AVIOContext created through avio_alloc_context() | 9 // AVIO works through a special AVIOContext created through avio_alloc_context() |
10 // which is attached to the AVFormatContext used for demuxing. The AVIO context | 10 // which is attached to the AVFormatContext used for demuxing. The AVIO context |
11 // is initialized with read and seek methods which FFmpeg calls when necessary. | 11 // is initialized with read and seek methods which FFmpeg calls when necessary. |
12 // | 12 // |
13 // During OpenContext() FFmpegGlue will tell FFmpeg to use Chrome's AVIO context | 13 // During OpenContext() FFmpegGlue will tell FFmpeg to use Chrome's AVIO context |
14 // by passing NULL in for the filename parameter to avformat_open_input(). All | 14 // by passing NULL in for the filename parameter to avformat_open_input(). All |
15 // FFmpeg operations using the configured AVFormatContext will then redirect | 15 // FFmpeg operations using the configured AVFormatContext will then redirect |
16 // reads and seeks through the glue. | 16 // reads and seeks through the glue. |
17 // | 17 // |
18 // The glue in turn processes those read and seek requests using the | 18 // The glue in turn processes those read and seek requests using the |
19 // FFmpegURLProtocol provided during construction. | 19 // FFmpegURLProtocol provided during construction. |
20 // | 20 // |
21 // FFmpegGlue is also responsible for initializing FFmpeg, which is done once | 21 // FFmpegGlue is also responsible for initializing FFmpeg, which is done once |
22 // per process. Initialization includes: turning off log messages, registering | 22 // per process. Initialization includes: turning off log messages, registering |
23 // a lock manager, and finally registering all demuxers and codecs. | 23 // a lock manager, and finally registering all demuxers and codecs. |
24 | 24 |
25 #ifndef MEDIA_FILTERS_FFMPEG_GLUE_H_ | 25 #ifndef MEDIA_FILTERS_FFMPEG_GLUE_H_ |
26 #define MEDIA_FILTERS_FFMPEG_GLUE_H_ | 26 #define MEDIA_FILTERS_FFMPEG_GLUE_H_ |
27 | 27 |
28 #include "base/basictypes.h" | |
29 #include "base/memory/scoped_ptr.h" | 28 #include "base/memory/scoped_ptr.h" |
30 #include "media/base/media_export.h" | 29 #include "media/base/media_export.h" |
31 #include "media/ffmpeg/ffmpeg_deleters.h" | 30 #include "media/ffmpeg/ffmpeg_deleters.h" |
32 | 31 |
33 struct AVFormatContext; | 32 struct AVFormatContext; |
34 struct AVIOContext; | 33 struct AVIOContext; |
35 | 34 |
36 namespace media { | 35 namespace media { |
37 | 36 |
38 class MEDIA_EXPORT FFmpegURLProtocol { | 37 class MEDIA_EXPORT FFmpegURLProtocol { |
39 public: | 38 public: |
40 // Read the given amount of bytes into data, returns the number of bytes read | 39 // Read the given amount of bytes into data, returns the number of bytes read |
41 // if successful, kReadError otherwise. | 40 // if successful, kReadError otherwise. |
42 virtual int Read(int size, uint8* data) = 0; | 41 virtual int Read(int size, uint8_t* data) = 0; |
43 | 42 |
44 // Returns true and the current file position for this file, false if the | 43 // Returns true and the current file position for this file, false if the |
45 // file position could not be retrieved. | 44 // file position could not be retrieved. |
46 virtual bool GetPosition(int64* position_out) = 0; | 45 virtual bool GetPosition(int64_t* position_out) = 0; |
47 | 46 |
48 // Returns true if the file position could be set, false otherwise. | 47 // Returns true if the file position could be set, false otherwise. |
49 virtual bool SetPosition(int64 position) = 0; | 48 virtual bool SetPosition(int64_t position) = 0; |
50 | 49 |
51 // Returns true and the file size, false if the file size could not be | 50 // Returns true and the file size, false if the file size could not be |
52 // retrieved. | 51 // retrieved. |
53 virtual bool GetSize(int64* size_out) = 0; | 52 virtual bool GetSize(int64_t* size_out) = 0; |
54 | 53 |
55 // Returns false if this protocol supports random seeking. | 54 // Returns false if this protocol supports random seeking. |
56 virtual bool IsStreaming() = 0; | 55 virtual bool IsStreaming() = 0; |
57 }; | 56 }; |
58 | 57 |
59 class MEDIA_EXPORT FFmpegGlue { | 58 class MEDIA_EXPORT FFmpegGlue { |
60 public: | 59 public: |
61 static void InitializeFFmpeg(); | 60 static void InitializeFFmpeg(); |
62 | 61 |
63 // See file documentation for usage. |protocol| must outlive FFmpegGlue. | 62 // See file documentation for usage. |protocol| must outlive FFmpegGlue. |
64 explicit FFmpegGlue(FFmpegURLProtocol* protocol); | 63 explicit FFmpegGlue(FFmpegURLProtocol* protocol); |
65 ~FFmpegGlue(); | 64 ~FFmpegGlue(); |
66 | 65 |
67 // Opens an AVFormatContext specially prepared to process reads and seeks | 66 // Opens an AVFormatContext specially prepared to process reads and seeks |
68 // through the FFmpegURLProtocol provided during construction. | 67 // through the FFmpegURLProtocol provided during construction. |
69 bool OpenContext(); | 68 bool OpenContext(); |
70 AVFormatContext* format_context() { return format_context_; } | 69 AVFormatContext* format_context() { return format_context_; } |
71 | 70 |
72 private: | 71 private: |
73 bool open_called_; | 72 bool open_called_; |
74 AVFormatContext* format_context_; | 73 AVFormatContext* format_context_; |
75 scoped_ptr<AVIOContext, ScopedPtrAVFree> avio_context_; | 74 scoped_ptr<AVIOContext, ScopedPtrAVFree> avio_context_; |
76 | 75 |
77 DISALLOW_COPY_AND_ASSIGN(FFmpegGlue); | 76 DISALLOW_COPY_AND_ASSIGN(FFmpegGlue); |
78 }; | 77 }; |
79 | 78 |
80 } // namespace media | 79 } // namespace media |
81 | 80 |
82 #endif // MEDIA_FILTERS_FFMPEG_GLUE_H_ | 81 #endif // MEDIA_FILTERS_FFMPEG_GLUE_H_ |
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