#include "metacube.h"
#include "server.h"
+#include "input.h"
#define NUM_SERVERS 4
#define STREAM_ID "stream"
Server *servers = NULL;
-class Input {
-public:
- Input(const string &stream_id);
-
- // Connect to the given URL and start streaming.
- // WARNING: Currently this blocks; it does not run in a separate thread!
- void run(const string &url);
-
-private:
- // Recovers the this pointer and calls curl_callback().
- static size_t curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata);
-
- // Stores the given data, looks for Metacube blocks (skipping data if needed),
- // and calls process_block() for each one.
- void curl_callback(char *ptr, size_t bytes);
- void process_block(const char *data, uint32_t size, uint32_t flags);
-
- // Drops <num_bytes> bytes from the head of <pending_data>,
- // and outputs a warning.
- void drop_pending_data(size_t num_bytes);
-
- string stream_id;
-
- // Data we have received but not fully processed yet.
- vector<char> pending_data;
-
- // If <pending_data> starts with a Metacube header,
- // this is true.
- bool has_metacube_header;
-};
-
-Input::Input(const string &stream_id)
- : stream_id(stream_id),
- has_metacube_header(false)
-{
-}
-
-void Input::run(const string &url)
-{
- CURL *curl = curl_easy_init();
- curl_easy_setopt(curl, CURLOPT_URL, STREAM_URL);
- curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &Input::curl_callback_thunk);
- curl_easy_setopt(curl, CURLOPT_WRITEDATA, this);
- curl_easy_perform(curl);
-}
-
-size_t Input::curl_callback_thunk(char *ptr, size_t size, size_t nmemb, void *userdata)
-{
- Input *input = static_cast<Input *>(userdata);
- size_t bytes = size * nmemb;
- input->curl_callback(ptr, bytes);
- return bytes;
-}
-
-void Input::curl_callback(char *ptr, size_t bytes)
-{
- pending_data.insert(pending_data.end(), ptr, ptr + bytes);
-
- for ( ;; ) {
- // If we don't have enough data (yet) for even the Metacube header, just return.
- if (pending_data.size() < sizeof(metacube_block_header)) {
- return;
- }
-
- // Make sure we have the Metacube sync header at the start.
- // We may need to skip over junk data (it _should_ not happen, though).
- if (!has_metacube_header) {
- char *ptr = static_cast<char *>(
- memmem(pending_data.data(), pending_data.size(),
- METACUBE_SYNC, strlen(METACUBE_SYNC)));
- if (ptr == NULL) {
- // OK, so we didn't find the sync marker. We know then that
- // we do not have the _full_ marker in the buffer, but we
- // could have N-1 bytes. Drop everything before that,
- // and then give up.
- drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
- return;
- } else {
- // Yay, we found the header. Drop everything (if anything) before it.
- drop_pending_data(ptr - pending_data.data());
- has_metacube_header = true;
-
- // Re-check that we have the entire header; we could have dropped data.
- if (pending_data.size() < sizeof(metacube_block_header)) {
- return;
- }
- }
- }
-
- // Now it's safe to read the header.
- metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
- assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
- uint32_t size = ntohl(hdr->size);
- uint32_t flags = ntohl(hdr->flags);
-
- // See if we have the entire block. If not, wait for more data.
- if (pending_data.size() < sizeof(metacube_block_header) + size) {
- return;
- }
-
- process_block(pending_data.data(), size, flags);
-
- // Consume this block. This isn't the most efficient way of dealing with things
- // should we have many blocks, but these routines don't need to be too efficient
- // anyway.
- pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
- }
-}
-
-void Input::process_block(const char *data, uint32_t size, uint32_t flags)
-{
- if (flags & METACUBE_FLAGS_HEADER) {
- string header(data, data + size);
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].set_header(stream_id, header);
- }
- } else {
- for (int i = 0; i < NUM_SERVERS; ++i) {
- servers[i].add_data(stream_id, data, size);
- }
- }
-}
-
-void Input::drop_pending_data(size_t num_bytes)
-{
- if (num_bytes == 0) {
- return;
- }
- fprintf(stderr, "Warning: Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?\n",
- (long long)num_bytes);
- pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
-}
-
int create_server_socket(int port)
{
int server_sock = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP);
exit(1);
}
+ int one = 1;
+ if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)) == -1) {
+ perror("setsockopt(SO_REUSEADDR)");
+ exit(1);
+ }
+
// We want dual-stack sockets. (Sorry, OpenBSD and Windows XP...)
int zero = 0;
if (setsockopt(server_sock, IPPROTO_IPV6, IPV6_V6ONLY, &zero, sizeof(zero)) == -1) {
Input input(STREAM_ID);
input.run(STREAM_URL);
+
+ for (int i = 0; i < NUM_SERVERS; ++i) {
+ servers[i].stop();
+ }
+ delete[] servers;
}
projects / cubemap / blobdiff