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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // Interface and some concrete classes for applying various transforms | 5 // Interface and some concrete classes for applying various transforms |
| 6 // to AVPackets. FFmpegBitstreamConverter, in particular, can be used | 6 // to AVPackets. FFmpegBitstreamConverter, in particular, can be used |
| 7 // to apply FFmpeg bitstream filters to the incoming AVPacket to transcode | 7 // to apply FFmpeg bitstream filters to the incoming AVPacket to transcode |
| 8 // the packet format. | 8 // the packet format. |
| 9 | 9 |
| 10 #ifndef MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ | 10 #ifndef MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ |
| 11 #define MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ | 11 #define MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ |
| 12 | 12 |
| 13 #include <string> | 13 #include <string> |
| 14 | 14 |
| 15 #include "base/basictypes.h" | 15 #include "base/basictypes.h" |
| 16 #include "base/gtest_prod_util.h" | 16 #include "base/gtest_prod_util.h" |
| 17 #include "media/base/media_export.h" |
| 17 | 18 |
| 18 // FFmpeg types. | 19 // FFmpeg types. |
| 19 struct AVBitStreamFilterContext; | 20 struct AVBitStreamFilterContext; |
| 20 struct AVCodecContext; | 21 struct AVCodecContext; |
| 21 struct AVPacket; | 22 struct AVPacket; |
| 22 | 23 |
| 23 namespace media { | 24 namespace media { |
| 24 | 25 |
| 25 class BitstreamConverter { | 26 class MEDIA_EXPORT BitstreamConverter { |
| 26 public: | 27 public: |
| 27 BitstreamConverter() {} | 28 BitstreamConverter() {} |
| 28 virtual ~BitstreamConverter() {} | 29 virtual ~BitstreamConverter() {} |
| 29 | 30 |
| 30 // Initialize does any preparations needed before doing the actual | 31 // Initialize does any preparations needed before doing the actual |
| 31 // conversion. | 32 // conversion. |
| 32 virtual bool Initialize() = 0; | 33 virtual bool Initialize() = 0; |
| 33 | 34 |
| 34 // Attemps to convert the AVPacket from one format to another, based on the | 35 // Attemps to convert the AVPacket from one format to another, based on the |
| 35 // specific type of BitstreamConverter that was instantiated. Output will be | 36 // specific type of BitstreamConverter that was instantiated. Output will be |
| (...skipping 10 matching lines...) Expand all Loading... |
| 46 IdentityBitstreamConverter() {} | 47 IdentityBitstreamConverter() {} |
| 47 virtual ~IdentityBitstreamConverter() {} | 48 virtual ~IdentityBitstreamConverter() {} |
| 48 | 49 |
| 49 virtual bool Initialize(); | 50 virtual bool Initialize(); |
| 50 virtual bool ConvertPacket(AVPacket* packet); | 51 virtual bool ConvertPacket(AVPacket* packet); |
| 51 | 52 |
| 52 private: | 53 private: |
| 53 DISALLOW_COPY_AND_ASSIGN(IdentityBitstreamConverter); | 54 DISALLOW_COPY_AND_ASSIGN(IdentityBitstreamConverter); |
| 54 }; | 55 }; |
| 55 | 56 |
| 56 class FFmpegBitstreamConverter : public BitstreamConverter { | 57 class MEDIA_EXPORT FFmpegBitstreamConverter : public BitstreamConverter { |
| 57 public: | 58 public: |
| 58 // Creates FFmpegBitstreamConverter based on the FFmpeg bistream filter | 59 // Creates FFmpegBitstreamConverter based on the FFmpeg bistream filter |
| 59 // corresponding to |filter_name|. | 60 // corresponding to |filter_name|. |
| 60 // | 61 // |
| 61 // The |stream_context| will be used during conversion and should be the | 62 // The |stream_context| will be used during conversion and should be the |
| 62 // AVCodecContext for the stream sourcing these packets. A reference to | 63 // AVCodecContext for the stream sourcing these packets. A reference to |
| 63 // |stream_context| is retained, so it must outlive this class. | 64 // |stream_context| is retained, so it must outlive this class. |
| 64 FFmpegBitstreamConverter(const std::string& filter_name, | 65 FFmpegBitstreamConverter(const std::string& filter_name, |
| 65 AVCodecContext* stream_context); | 66 AVCodecContext* stream_context); |
| 66 virtual ~FFmpegBitstreamConverter(); | 67 virtual ~FFmpegBitstreamConverter(); |
| 67 | 68 |
| 68 virtual bool Initialize(); | 69 virtual bool Initialize(); |
| 69 virtual bool ConvertPacket(AVPacket* packet); | 70 virtual bool ConvertPacket(AVPacket* packet); |
| 70 | 71 |
| 71 private: | 72 private: |
| 72 std::string filter_name_; | 73 std::string filter_name_; |
| 73 AVBitStreamFilterContext* stream_filter_; | 74 AVBitStreamFilterContext* stream_filter_; |
| 74 AVCodecContext* stream_context_; | 75 AVCodecContext* stream_context_; |
| 75 | 76 |
| 76 DISALLOW_COPY_AND_ASSIGN(FFmpegBitstreamConverter); | 77 DISALLOW_COPY_AND_ASSIGN(FFmpegBitstreamConverter); |
| 77 }; | 78 }; |
| 78 | 79 |
| 79 } // namespace media | 80 } // namespace media |
| 80 | 81 |
| 81 #endif // MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ | 82 #endif // MEDIA_FILTERS_BITSTREAM_CONVERTER_H_ |
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