-#include <stdio.h>
-#include <unistd.h>
+#include <assert.h>
#include <errno.h>
-#include <algorithm>
+#include <netinet/in.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
#include <string>
#include <vector>
+#include "log.h"
+#include "metacube.h"
+#include "state.pb.h"
#include "stream.h"
#include "util.h"
-#include "state.pb.h"
using namespace std;
-Stream::Stream(const string &stream_id, size_t backlog_size)
+Stream::Stream(const string &stream_id, size_t backlog_size, Encoding encoding)
: stream_id(stream_id),
+ encoding(encoding),
data_fd(make_tempfile("")),
backlog_size(backlog_size),
bytes_received(0),
Stream::~Stream()
{
if (data_fd != -1) {
- int ret;
- do {
- ret = close(data_fd);
- } while (ret == -1 && errno == EINTR);
- if (ret == -1) {
- perror("close");
- }
+ safe_close(data_fd);
}
}
-Stream::Stream(const StreamProto &serialized)
+Stream::Stream(const StreamProto &serialized, int data_fd)
: stream_id(serialized.stream_id()),
- header(serialized.header()),
- data_fd(make_tempfile(serialized.data())),
+ http_header(serialized.http_header()),
+ stream_header(serialized.stream_header()),
+ encoding(Stream::STREAM_ENCODING_RAW), // Will be changed later.
+ data_fd(data_fd),
backlog_size(serialized.backlog_size()),
bytes_received(serialized.bytes_received()),
mark_pool(NULL)
if (data_fd == -1) {
exit(1);
}
+
+ // Split old-style headers into HTTP and video headers.
+ if (!serialized.header().empty()) {
+ string header = serialized.header();
+ size_t split = header.find("\r\n\r\n");
+ if (split == string::npos) {
+ http_header = header;
+ stream_header = "";
+ } else {
+ http_header = header.substr(0, split + 2); // Split off the second \r\n.
+ stream_header = header.substr(split, string::npos);
+ }
+ }
}
StreamProto Stream::serialize()
{
StreamProto serialized;
- serialized.set_header(header);
- if (!read_tempfile(data_fd, serialized.mutable_data())) { // Closes data_fd.
- exit(1);
- }
+ serialized.set_http_header(http_header);
+ serialized.set_stream_header(stream_header);
+ serialized.add_data_fds(data_fd);
serialized.set_backlog_size(backlog_size);
serialized.set_bytes_received(bytes_received);
serialized.set_stream_id(stream_id);
data_fd = -1;
return serialized;
}
+
+void Stream::set_backlog_size(size_t new_size)
+{
+ if (backlog_size == new_size) {
+ return;
+ }
+
+ string existing_data;
+ if (!read_tempfile_and_close(data_fd, &existing_data)) {
+ exit(1);
+ }
+
+ // Unwrap the data so it's no longer circular.
+ if (bytes_received <= backlog_size) {
+ existing_data.resize(bytes_received);
+ } else {
+ size_t pos = bytes_received % backlog_size;
+ existing_data = existing_data.substr(pos, string::npos) +
+ existing_data.substr(0, pos);
+ }
+
+ // See if we need to discard data.
+ if (new_size < existing_data.size()) {
+ size_t to_discard = existing_data.size() - new_size;
+ existing_data = existing_data.substr(to_discard, string::npos);
+ }
+
+ // Create a new, empty data file.
+ data_fd = make_tempfile("");
+ if (data_fd == -1) {
+ exit(1);
+ }
+ backlog_size = new_size;
+
+ // Now cheat a bit by rewinding, and adding all the old data back.
+ bytes_received -= existing_data.size();
+ add_data_raw(existing_data.data(), existing_data.size());
+}
void Stream::put_client_to_sleep(Client *client)
{
sleeping_clients.push_back(client);
}
+void Stream::add_data(const char *data, ssize_t bytes)
+{
+ if (encoding == Stream::STREAM_ENCODING_RAW) {
+ add_data_raw(data, bytes);
+ } else if (encoding == STREAM_ENCODING_METACUBE) {
+ metacube_block_header hdr;
+ memcpy(hdr.sync, METACUBE_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(bytes);
+ hdr.flags = htonl(0);
+
+ char *block = new char[bytes + sizeof(hdr)];
+ memcpy(block, &hdr, sizeof(hdr));
+ memcpy(block + sizeof(hdr), data, bytes);
+ add_data_raw(block, bytes + sizeof(hdr));
+ delete[] block;
+ } else {
+ assert(false);
+ }
+}
+
+void Stream::add_data_raw(const char *data, ssize_t bytes)
+{
+ size_t pos = bytes_received % backlog_size;
+ bytes_received += bytes;
+
+ if (pos + bytes > backlog_size) {
+ ssize_t to_copy = backlog_size - pos;
+ while (to_copy > 0) {
+ int ret = pwrite(data_fd, data, to_copy, pos);
+ if (ret == -1 && errno == EINTR) {
+ continue;
+ }
+ if (ret == -1) {
+ log_perror("pwrite");
+ // Dazed and confused, but trying to continue...
+ break;
+ }
+ pos += ret;
+ data += ret;
+ to_copy -= ret;
+ bytes -= ret;
+ }
+ pos = 0;
+ }
+
+ while (bytes > 0) {
+ int ret = pwrite(data_fd, data, bytes, pos);
+ if (ret == -1 && errno == EINTR) {
+ continue;
+ }
+ if (ret == -1) {
+ log_perror("pwrite");
+ // Dazed and confused, but trying to continue...
+ break;
+ }
+ pos += ret;
+ data += ret;
+ bytes -= ret;
+ }
+}
+
void Stream::wake_up_all_clients()
{
if (to_process.empty()) {
projects / cubemap / blobdiff