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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 #ifndef MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ | 5 #ifndef MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ |
| 6 #define MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ | 6 #define MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ |
| 7 | 7 |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/callback.h" | 8 #include "base/callback.h" |
| 10 #include "base/synchronization/waitable_event.h" | 9 #include "base/synchronization/waitable_event.h" |
| 11 #include "media/filters/ffmpeg_glue.h" | 10 #include "media/filters/ffmpeg_glue.h" |
| 12 | 11 |
| 13 namespace media { | 12 namespace media { |
| 14 | 13 |
| 15 class DataSource; | 14 class DataSource; |
| 16 | 15 |
| 17 // An implementation of FFmpegURLProtocol that blocks until the underlying | 16 // An implementation of FFmpegURLProtocol that blocks until the underlying |
| 18 // asynchronous DataSource::Read() operation completes. | 17 // asynchronous DataSource::Read() operation completes. |
| 19 class MEDIA_EXPORT BlockingUrlProtocol : public FFmpegURLProtocol { | 18 class MEDIA_EXPORT BlockingUrlProtocol : public FFmpegURLProtocol { |
| 20 public: | 19 public: |
| 21 // Implements FFmpegURLProtocol using the given |data_source|. |error_cb| is | 20 // Implements FFmpegURLProtocol using the given |data_source|. |error_cb| is |
| 22 // fired any time DataSource::Read() returns an error. | 21 // fired any time DataSource::Read() returns an error. |
| 23 // | 22 // |
| 24 // TODO(scherkus): After all blocking operations are isolated on a separate | 23 // TODO(scherkus): After all blocking operations are isolated on a separate |
| 25 // thread we should be able to eliminate |error_cb|. | 24 // thread we should be able to eliminate |error_cb|. |
| 26 BlockingUrlProtocol(DataSource* data_source, const base::Closure& error_cb); | 25 BlockingUrlProtocol(DataSource* data_source, const base::Closure& error_cb); |
| 27 virtual ~BlockingUrlProtocol(); | 26 virtual ~BlockingUrlProtocol(); |
| 28 | 27 |
| 29 // Aborts any pending reads by returning a read error. After this method | 28 // Aborts any pending reads by returning a read error. After this method |
| 30 // returns all subsequent calls to Read() will immediately fail. | 29 // returns all subsequent calls to Read() will immediately fail. |
| 31 void Abort(); | 30 void Abort(); |
| 32 | 31 |
| 33 // FFmpegURLProtocol implementation. | 32 // FFmpegURLProtocol implementation. |
| 34 int Read(int size, uint8* data) override; | 33 int Read(int size, uint8_t* data) override; |
| 35 bool GetPosition(int64* position_out) override; | 34 bool GetPosition(int64_t* position_out) override; |
| 36 bool SetPosition(int64 position) override; | 35 bool SetPosition(int64_t position) override; |
| 37 bool GetSize(int64* size_out) override; | 36 bool GetSize(int64_t* size_out) override; |
| 38 bool IsStreaming() override; | 37 bool IsStreaming() override; |
| 39 | 38 |
| 40 private: | 39 private: |
| 41 // Sets |last_read_bytes_| and signals the blocked thread that the read | 40 // Sets |last_read_bytes_| and signals the blocked thread that the read |
| 42 // has completed. | 41 // has completed. |
| 43 void SignalReadCompleted(int size); | 42 void SignalReadCompleted(int size); |
| 44 | 43 |
| 45 DataSource* data_source_; | 44 DataSource* data_source_; |
| 46 base::Closure error_cb_; | 45 base::Closure error_cb_; |
| 47 | 46 |
| 48 // Used to unblock the thread during shutdown and when reads complete. | 47 // Used to unblock the thread during shutdown and when reads complete. |
| 49 base::WaitableEvent aborted_; | 48 base::WaitableEvent aborted_; |
| 50 base::WaitableEvent read_complete_; | 49 base::WaitableEvent read_complete_; |
| 51 | 50 |
| 52 // Cached number of bytes last read from the data source. | 51 // Cached number of bytes last read from the data source. |
| 53 int last_read_bytes_; | 52 int last_read_bytes_; |
| 54 | 53 |
| 55 // Cached position within the data source. | 54 // Cached position within the data source. |
| 56 int64 read_position_; | 55 int64_t read_position_; |
| 57 | 56 |
| 58 DISALLOW_IMPLICIT_CONSTRUCTORS(BlockingUrlProtocol); | 57 DISALLOW_IMPLICIT_CONSTRUCTORS(BlockingUrlProtocol); |
| 59 }; | 58 }; |
| 60 | 59 |
| 61 } // namespace media | 60 } // namespace media |
| 62 | 61 |
| 63 #endif // MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ | 62 #endif // MEDIA_FILTERS_BLOCKING_URL_PROTOCOL_H_ |
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