#include <media_handler.h>
Public Member Functions | |
| Status | SetHandler (size_t output_stream_index, std::shared_ptr< MediaHandler > handler) |
| Connect downstream handler at the specified output stream index. | |
| Status | AddHandler (std::shared_ptr< MediaHandler > handler) |
| Connect downstream handler to the next availble output stream index. | |
| Status | Initialize () |
| bool | IsConnected () |
| Validate if the handler is connected to its upstream handler. | |
Protected Member Functions | |
| virtual Status | InitializeInternal ()=0 |
| virtual Status | Process (std::unique_ptr< StreamData > stream_data)=0 |
| virtual Status | OnFlushRequest (size_t input_stream_index) |
| Event handler for flush request at the specific input stream index. | |
| virtual bool | ValidateOutputStreamIndex (size_t stream_index) const |
| Validate if the stream at the specified index actually exists. | |
| Status | Dispatch (std::unique_ptr< StreamData > stream_data) |
| Status | DispatchStreamInfo (size_t stream_index, std::shared_ptr< const StreamInfo > stream_info) |
| Dispatch the stream info to downstream handlers. | |
| Status | DispatchMediaSample (size_t stream_index, std::shared_ptr< const MediaSample > media_sample) |
| Dispatch the media sample to downstream handlers. | |
| Status | DispatchTextSample (size_t stream_index, std::shared_ptr< const TextSample > text_sample) |
| Dispatch the text sample to downsream handlers. | |
| Status | DispatchSegmentInfo (size_t stream_index, std::shared_ptr< const SegmentInfo > segment_info) |
| Dispatch the segment info to downstream handlers. | |
| Status | DispatchScte35Event (size_t stream_index, std::shared_ptr< const Scte35Event > scte35_event) |
| Dispatch the scte35 event to downstream handlers. | |
| Status | DispatchCueEvent (size_t stream_index, std::shared_ptr< const CueEvent > cue_event) |
| Dispatch the cue event to downstream handlers. | |
| Status | FlushDownstream (size_t output_stream_index) |
| Flush the downstream connected at the specified output stream index. | |
| Status | FlushAllDownstreams () |
| Flush all connected downstreams. | |
| bool | initialized () |
| size_t | num_input_streams () const |
| size_t | next_output_stream_index () const |
| const std::map< size_t, std::pair< std::shared_ptr< MediaHandler >, size_t > > & | output_handlers () |
Detailed Description
MediaHandler is the base media processing unit. Media handlers transform the input streams and propagate the outputs to downstream media handlers. There are three different types of media handlers: 1) Single input single output This is the most basic handler. It only supports one input and one output with both index as 0. 2) Multiple inputs multiple outputs The number of outputs must be equal to the number of inputs. The output stream at a specific index comes from the input stream at the same index. Different streams usually share a common resource, although they may be independent. One example of this is encryptor handler. 3) Single input multiple outputs The input stream is splitted into multiple output streams. One example of this is trick play handler. Other types of media handlers are disallowed and not supported.
Definition at line 148 of file media_handler.h.
Member Function Documentation
◆ Dispatch()
|
protected |
Dispatch the stream data to downstream handlers. Note that stream_data.stream_index should be the output stream index.
Definition at line 52 of file media_handler.cc.
◆ Initialize()
| Status shaka::media::MediaHandler::Initialize | ( | ) |
Initialize the handler and downstream handlers. Note that it should be called after setting up the graph before running the graph.
Definition at line 24 of file media_handler.cc.
◆ InitializeInternal()
|
protectedpure virtual |
Internal implementation of initialize. Note that it should only initialize the MediaHandler itself. Downstream handlers are handled in Initialize().
Implemented in shaka::media::FakeMediaHandler, shaka::media::Demuxer, shaka::media::Muxer, shaka::media::ChunkingHandler, and shaka::media::EncryptionHandler.
◆ Process()
|
protectedpure virtual |
Process the incoming stream data. Note that (1) stream_data.stream_index should be the input stream index; (2) The implementation needs to call DispatchXxx to dispatch the processed stream data to the downstream handlers after finishing processing if needed.
Implemented in shaka::media::FakeMediaHandler, shaka::media::Demuxer, shaka::media::Muxer, shaka::media::ChunkingHandler, shaka::media::WebVttToMp4Handler, shaka::media::EncryptionHandler, and shaka::media::WebVttSegmenter.
The documentation for this class was generated from the following files:
- packager/media/base/media_handler.h
- packager/media/base/media_handler.cc
