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| 1 // Copyright (c) 2008-2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2008-2009 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 // FilterHost describes an interface for individual filters to access and | 5 // FilterHost describes an interface for individual filters to access and |
| 6 // modify global playback information. Every filter is given a filter host | 6 // modify global playback information. Every filter is given a filter host |
| 7 // reference as part of initialization. | 7 // reference as part of initialization. |
| 8 // | 8 // |
| 9 // This interface is intentionally verbose to cover the needs for the different | 9 // This interface is intentionally verbose to cover the needs for the different |
| 10 // types of filters (see media/base/filters.h for filter definitionss). Filters | 10 // types of filters (see media/base/filters.h for filter definitionss). Filters |
| 11 // typically use parts of the interface that are relevant to their function. | 11 // typically use parts of the interface that are relevant to their function. |
| 12 // For example, an audio renderer filter typically calls SetTime as it feeds | 12 // For example, an audio renderer filter typically calls SetTime as it feeds |
| 13 // data to the audio hardware. A video renderer filter typically calls GetTime | 13 // data to the audio hardware. A video renderer filter typically calls GetTime |
| 14 // to synchronize video with audio. An audio and video decoder would typically | 14 // to synchronize video with audio. An audio and video decoder would typically |
| 15 // have no need to call either SetTime or GetTime. | 15 // have no need to call either SetTime or GetTime. |
| 16 | 16 |
| 17 #ifndef MEDIA_BASE_FILTER_HOST_H_ | 17 #ifndef MEDIA_BASE_FILTER_HOST_H_ |
| 18 #define MEDIA_BASE_FILTER_HOST_H_ | 18 #define MEDIA_BASE_FILTER_HOST_H_ |
| 19 | 19 |
| 20 #include "base/task.h" | 20 #include "base/task.h" |
| 21 #include "media/base/pipeline.h" | 21 #include "media/base/pipeline.h" |
| 22 | 22 |
| 23 namespace media { | 23 namespace media { |
| 24 | 24 |
| 25 class FilterHost { | 25 class FilterHost { |
| 26 public: | 26 public: |
| 27 // Stops execution of the pipeline due to a fatal error. Do not call this | 27 // Stops execution of the pipeline due to a fatal error. Do not call this |
| 28 // method with PIPELINE_OK or PIPELINE_STOPPING (used internally by pipeline). | 28 // method with PIPELINE_OK or PIPELINE_STOPPING (used internally by pipeline). |
| 29 virtual void Error(PipelineError error) = 0; | 29 virtual void SetError(PipelineError error) = 0; |
| 30 | 30 |
| 31 // Gets the current time in microseconds. | 31 // Gets the current time in microseconds. |
| 32 virtual base::TimeDelta GetTime() const = 0; | 32 virtual base::TimeDelta GetTime() const = 0; |
| 33 | 33 |
| 34 // Updates the current time. Other filters should poll to examine the updated | 34 // Updates the current time. Other filters should poll to examine the updated |
| 35 // time. | 35 // time. |
| 36 virtual void SetTime(base::TimeDelta time) = 0; | 36 virtual void SetTime(base::TimeDelta time) = 0; |
| 37 | 37 |
| 38 // Get the duration of the media in microseconds. If the duration has not | 38 // Get the duration of the media in microseconds. If the duration has not |
| 39 // been determined yet, then returns 0. | 39 // been determined yet, then returns 0. |
| (...skipping 13 matching lines...) Expand all Loading... |
| 53 // Sets the size of the video output in pixel units. | 53 // Sets the size of the video output in pixel units. |
| 54 virtual void SetVideoSize(size_t width, size_t height) = 0; | 54 virtual void SetVideoSize(size_t width, size_t height) = 0; |
| 55 | 55 |
| 56 protected: | 56 protected: |
| 57 virtual ~FilterHost() {} | 57 virtual ~FilterHost() {} |
| 58 }; | 58 }; |
| 59 | 59 |
| 60 } // namespace media | 60 } // namespace media |
| 61 | 61 |
| 62 #endif // MEDIA_BASE_FILTER_HOST_H_ | 62 #endif // MEDIA_BASE_FILTER_HOST_H_ |
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