| // Copyright 2013 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_ |
| #define MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_ |
| |
| #include "base/memory/ref_counted.h" |
| #include "media/base/encoded_bitstream_buffer.h" |
| #include "media/video/video_encode_types.h" |
| |
| namespace media { |
| |
| // Class to represent any encoded video source. Anything that provides encoded |
| // video can be an EncodedVideoSource. Notable examples of this can be video |
| // encoder and webcam that has encoding capabilities. |
| // TODO(hshi): merge this with VEA interface. http://crbug.com/248334. |
| class EncodedVideoSource { |
| public: |
| class Client { |
| public: |
| // Notifies client that bitstream is opened successfully. The |params| |
| // contains the actual encoding parameters chosen by the browser process. |
| // It may be different from the params requested in OpenBitstream(). |
| virtual void OnOpened(const VideoEncodingParameters& params) = 0; |
| |
| // Notifies client that bitstream is closed. After this call it is |
| // guaranteed that client will not receive further calls. |
| virtual void OnClosed() = 0; |
| |
| // Delivers an encoded bitstream buffer to the client. |
| virtual void OnBufferReady( |
| scoped_refptr<const EncodedBitstreamBuffer> buffer) = 0; |
| |
| // Notifies client that encoding parameters has changed. The |params| |
| // contains the current encoding parameters chosen by the browser process. |
| // It may be different from the params requested in TrySetBitstreamConfig(). |
| virtual void OnConfigChanged( |
| const RuntimeVideoEncodingParameters& params) = 0; |
| }; |
| |
| // Callback is invoked once RequestCapabilities() is complete. |
| typedef base::Callback<void(const VideoEncodingCapabilities& capabilities)> |
| RequestCapabilitiesCallback; |
| |
| // RequestCapabilities initiates an asynchronous query for the types of |
| // encoded bitstream supported by the encoder. This call should be invoked |
| // only once. EncodedVideoSource will invoke |callback| when capabilities |
| // become available. |
| virtual void RequestCapabilities( |
| const RequestCapabilitiesCallback& callback) = 0; |
| |
| // OpenBitstream opens the bitstream on the encoded video source. Only one |
| // bitstream can be opened for an encoded video source. |
| virtual void OpenBitstream(Client* client, |
| const VideoEncodingParameters& params) = 0; |
| |
| // CloseBitstream closes the bitstream. |
| virtual void CloseBitstream() = 0; |
| |
| // ReturnBitstreamBuffer notifies that the data within the buffer has been |
| // processed and it can be reused to encode upcoming bitstream. |
| virtual void ReturnBitstreamBuffer( |
| scoped_refptr<const media::EncodedBitstreamBuffer> buffer) = 0; |
| |
| // TrySetBitstreamConfig requests to change encoding parameters. Old config |
| // must be considered valid until OnConfigChanged is invoked on the client |
| // signaling successful change. |
| virtual void TrySetBitstreamConfig( |
| const RuntimeVideoEncodingParameters& params) = 0; |
| |
| // RequestKeyFrame requests a key frame. |
| virtual void RequestKeyFrame() = 0; |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_VIDEO_ENCODED_VIDEO_SOURCE_H_ |
| |