X-Git-Url: https://git.sesse.net/?p=cubemap;a=blobdiff_plain;f=stream.cpp;h=e61428a97318ec6be30e6a44964a79ac571a7f4a;hp=080d3bf95a5086a20338a6754dad5026babe791e;hb=3b8ad87137cff7522ed12f4675d5ff26933bc94a;hpb=488f28bf7070f44469a006ed4a9d4c423788d175

diff --git a/stream.cpp b/stream.cpp
index 080d3bf..e61428a 100644
--- a/stream.cpp
+++ b/stream.cpp
@@ -1,3 +1,4 @@
+#include <arpa/inet.h>
 #include <errno.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -6,13 +7,16 @@
 #include <vector>
 
 #include "state.pb.h"
+#include "log.h"
+#include "metacube.h"
 #include "stream.h"
 #include "util.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),
@@ -31,14 +35,16 @@ Stream::~Stream()
 			ret = close(data_fd);
 		} while (ret == -1 && errno == EINTR);
 		if (ret == -1) {
-			perror("close");
+			log_perror("close");
 		}
 	}
 }
 
 Stream::Stream(const StreamProto &serialized)
 	: stream_id(serialized.stream_id()),
-	  header(serialized.header()),
+	  http_header(serialized.http_header()),
+	  stream_header(serialized.stream_header()),
+	  encoding(Stream::STREAM_ENCODING_RAW),  // Will be changed later.
 	  data_fd(make_tempfile(serialized.data())),
 	  backlog_size(serialized.backlog_size()),
 	  bytes_received(serialized.bytes_received()),
@@ -47,12 +53,26 @@ Stream::Stream(const StreamProto &serialized)
 	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);
+	serialized.set_http_header(http_header);
+	serialized.set_stream_header(stream_header);
 	if (!read_tempfile(data_fd, serialized.mutable_data())) {  // Closes data_fd.
 		exit(1);
 	}
@@ -62,12 +82,108 @@ StreamProto Stream::serialize()
 	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(data_fd, &existing_data)) {  // Closes data_fd.
+		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("");
+	backlog_size = new_size;
+
+	// Now cheat a bit by rewinding, and adding all the old data back.
+	bytes_received -= existing_data.size();
+	add_data(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()) {