4 // Representation of a single, muxed (we only really care about bytes/blocks) stream.
5 // Fed by Input, sent out by Server (to Client).
17 Stream(const std::string &stream_id, size_t backlog_size);
20 // Serialization/deserialization.
21 Stream(const StreamProto &serialized);
22 StreamProto serialize();
24 // Changes the backlog size, restructuring the data as needed.
25 void set_backlog_size(size_t new_size);
27 std::string stream_id;
29 // The HTTP response header, plus the video stream header (if any).
32 // The stream data itself, stored in a circular buffer.
34 // We store our data in a file, so that we can send the data to the
35 // kernel only once (with write()). We then use sendfile() for each
36 // client, which effectively zero-copies it out of the kernel's buffer
37 // cache. This is significantly more efficient than doing write() from
38 // a userspace memory buffer, since the latter makes the kernel copy
39 // the same data from userspace many times.
42 // How many bytes <data_fd> can hold (the buffer size).
45 // How many bytes this stream have received. Can very well be larger
46 // than <backlog_size>, since the buffer wraps.
47 size_t bytes_received;
49 // Clients that are in SENDING_DATA, but that we don't listen on,
50 // because we currently don't have any data for them.
51 // See put_client_to_sleep() and wake_up_all_clients().
52 std::vector<Client *> sleeping_clients;
54 // Clients that we recently got data for (when they were in
55 // <sleeping_clients>).
56 std::vector<Client *> to_process;
58 // What pool to fetch marks from, or NULL.
61 // Put client to sleep, since there is no more data for it; we will on
62 // longer listen on POLLOUT until we get more data. Also, it will be put
63 // in the list of clients to wake up when we do.
64 void put_client_to_sleep(Client *client);
66 // Add more input data to the stream. You should probably call wake_up_all_clients()
68 void add_data(const char *data, ssize_t bytes);
70 // We have more data, so mark all clients that are sleeping as ready to go.
71 void wake_up_all_clients();
74 Stream(const Stream& other);
77 #endif // !defined(_STREAM_H)