17 Stream::Stream(const string &stream_id, size_t backlog_size, Encoding encoding)
18 : stream_id(stream_id),
20 data_fd(make_tempfile("")),
21 backlog_size(backlog_size),
36 } while (ret == -1 && errno == EINTR);
43 Stream::Stream(const StreamProto &serialized, int data_fd)
44 : stream_id(serialized.stream_id()),
45 http_header(serialized.http_header()),
46 stream_header(serialized.stream_header()),
47 encoding(Stream::STREAM_ENCODING_RAW), // Will be changed later.
49 backlog_size(serialized.backlog_size()),
50 bytes_received(serialized.bytes_received()),
57 // Split old-style headers into HTTP and video headers.
58 if (!serialized.header().empty()) {
59 string header = serialized.header();
60 size_t split = header.find("\r\n\r\n");
61 if (split == string::npos) {
65 http_header = header.substr(0, split + 2); // Split off the second \r\n.
66 stream_header = header.substr(split, string::npos);
71 StreamProto Stream::serialize()
73 StreamProto serialized;
74 serialized.set_http_header(http_header);
75 serialized.set_stream_header(stream_header);
76 serialized.add_data_fds(data_fd);
77 serialized.set_backlog_size(backlog_size);
78 serialized.set_bytes_received(bytes_received);
79 serialized.set_stream_id(stream_id);
84 void Stream::set_backlog_size(size_t new_size)
86 if (backlog_size == new_size) {
91 if (!read_tempfile_and_close(data_fd, &existing_data)) {
95 // Unwrap the data so it's no longer circular.
96 if (bytes_received <= backlog_size) {
97 existing_data.resize(bytes_received);
99 size_t pos = bytes_received % backlog_size;
100 existing_data = existing_data.substr(pos, string::npos) +
101 existing_data.substr(0, pos);
104 // See if we need to discard data.
105 if (new_size < existing_data.size()) {
106 size_t to_discard = existing_data.size() - new_size;
107 existing_data = existing_data.substr(to_discard, string::npos);
110 // Create a new, empty data file.
111 data_fd = make_tempfile("");
112 backlog_size = new_size;
114 // Now cheat a bit by rewinding, and adding all the old data back.
115 bytes_received -= existing_data.size();
116 add_data(existing_data.data(), existing_data.size());
119 void Stream::put_client_to_sleep(Client *client)
121 sleeping_clients.push_back(client);
124 void Stream::add_data(const char *data, ssize_t bytes)
126 if (encoding == Stream::STREAM_ENCODING_RAW) {
127 add_data_raw(data, bytes);
128 } else if (encoding == STREAM_ENCODING_METACUBE) {
129 metacube_block_header hdr;
130 memcpy(hdr.sync, METACUBE_SYNC, sizeof(hdr.sync));
131 hdr.size = htonl(bytes);
132 hdr.flags = htonl(0);
134 char *block = new char[bytes + sizeof(hdr)];
135 memcpy(block, &hdr, sizeof(hdr));
136 memcpy(block + sizeof(hdr), data, bytes);
137 add_data_raw(block, bytes + sizeof(hdr));
144 void Stream::add_data_raw(const char *data, ssize_t bytes)
146 size_t pos = bytes_received % backlog_size;
147 bytes_received += bytes;
149 if (pos + bytes > backlog_size) {
150 ssize_t to_copy = backlog_size - pos;
151 while (to_copy > 0) {
152 int ret = pwrite(data_fd, data, to_copy, pos);
153 if (ret == -1 && errno == EINTR) {
157 log_perror("pwrite");
158 // Dazed and confused, but trying to continue...
170 int ret = pwrite(data_fd, data, bytes, pos);
171 if (ret == -1 && errno == EINTR) {
175 log_perror("pwrite");
176 // Dazed and confused, but trying to continue...
185 void Stream::wake_up_all_clients()
187 if (to_process.empty()) {
188 swap(sleeping_clients, to_process);
190 to_process.insert(to_process.end(), sleeping_clients.begin(), sleeping_clients.end());
191 sleeping_clients.clear();