3 #include <netinet/in.h>
18 Stream::Stream(const string &stream_id, size_t backlog_size, Encoding encoding)
19 : stream_id(stream_id),
21 data_fd(make_tempfile("")),
22 backlog_size(backlog_size),
37 } while (ret == -1 && errno == EINTR);
44 Stream::Stream(const StreamProto &serialized, int data_fd)
45 : stream_id(serialized.stream_id()),
46 http_header(serialized.http_header()),
47 stream_header(serialized.stream_header()),
48 encoding(Stream::STREAM_ENCODING_RAW), // Will be changed later.
50 backlog_size(serialized.backlog_size()),
51 bytes_received(serialized.bytes_received()),
58 // Split old-style headers into HTTP and video headers.
59 if (!serialized.header().empty()) {
60 string header = serialized.header();
61 size_t split = header.find("\r\n\r\n");
62 if (split == string::npos) {
66 http_header = header.substr(0, split + 2); // Split off the second \r\n.
67 stream_header = header.substr(split, string::npos);
72 StreamProto Stream::serialize()
74 StreamProto serialized;
75 serialized.set_http_header(http_header);
76 serialized.set_stream_header(stream_header);
77 serialized.add_data_fds(data_fd);
78 serialized.set_backlog_size(backlog_size);
79 serialized.set_bytes_received(bytes_received);
80 serialized.set_stream_id(stream_id);
85 void Stream::set_backlog_size(size_t new_size)
87 if (backlog_size == new_size) {
92 if (!read_tempfile_and_close(data_fd, &existing_data)) {
96 // Unwrap the data so it's no longer circular.
97 if (bytes_received <= backlog_size) {
98 existing_data.resize(bytes_received);
100 size_t pos = bytes_received % backlog_size;
101 existing_data = existing_data.substr(pos, string::npos) +
102 existing_data.substr(0, pos);
105 // See if we need to discard data.
106 if (new_size < existing_data.size()) {
107 size_t to_discard = existing_data.size() - new_size;
108 existing_data = existing_data.substr(to_discard, string::npos);
111 // Create a new, empty data file.
112 data_fd = make_tempfile("");
113 backlog_size = new_size;
115 // Now cheat a bit by rewinding, and adding all the old data back.
116 bytes_received -= existing_data.size();
117 add_data(existing_data.data(), existing_data.size());
120 void Stream::put_client_to_sleep(Client *client)
122 sleeping_clients.push_back(client);
125 void Stream::add_data(const char *data, ssize_t bytes)
127 if (encoding == Stream::STREAM_ENCODING_RAW) {
128 add_data_raw(data, bytes);
129 } else if (encoding == STREAM_ENCODING_METACUBE) {
130 metacube_block_header hdr;
131 memcpy(hdr.sync, METACUBE_SYNC, sizeof(hdr.sync));
132 hdr.size = htonl(bytes);
133 hdr.flags = htonl(0);
135 char *block = new char[bytes + sizeof(hdr)];
136 memcpy(block, &hdr, sizeof(hdr));
137 memcpy(block + sizeof(hdr), data, bytes);
138 add_data_raw(block, bytes + sizeof(hdr));
145 void Stream::add_data_raw(const char *data, ssize_t bytes)
147 size_t pos = bytes_received % backlog_size;
148 bytes_received += bytes;
150 if (pos + bytes > backlog_size) {
151 ssize_t to_copy = backlog_size - pos;
152 while (to_copy > 0) {
153 int ret = pwrite(data_fd, data, to_copy, pos);
154 if (ret == -1 && errno == EINTR) {
158 log_perror("pwrite");
159 // Dazed and confused, but trying to continue...
171 int ret = pwrite(data_fd, data, bytes, pos);
172 if (ret == -1 && errno == EINTR) {
176 log_perror("pwrite");
177 // Dazed and confused, but trying to continue...
186 void Stream::wake_up_all_clients()
188 if (to_process.empty()) {
189 swap(sleeping_clients, to_process);
191 to_process.insert(to_process.end(), sleeping_clients.begin(), sleeping_clients.end());
192 sleeping_clients.clear();