#include <sys/types.h>
#include <sys/uio.h>
#include <deque>
+#include <memory>
#include <mutex>
#include <string>
#include <vector>
+#include "metacube2.h"
+
class StreamProto;
struct Client;
+// metacube2_pts_packet except the type and byteswapping.
+struct RationalPTS {
+ int64_t pts = 0;
+ uint64_t timebase_num = 0, timebase_den = 0; // 0/0 for unknown PTS.
+};
+
struct Stream {
// Must be in sync with StreamConfig::Encoding.
enum Encoding { STREAM_ENCODING_RAW = 0, STREAM_ENCODING_METACUBE };
- Stream(const std::string &stream_id, size_t backlog_size, size_t prebuffering_bytes, Encoding encoding, Encoding src_encoding);
+ Stream(const std::string &url,
+ size_t backlog_size,
+ uint64_t prebuffering_bytes,
+ Encoding encoding,
+ Encoding src_encoding,
+ unsigned hls_frag_duration,
+ size_t hls_backlog_margin,
+ const std::string &allow_origin);
~Stream();
// Serialization/deserialization.
// What encoding we expect the incoming data to be in (usually Metacube).
Encoding src_encoding;
+ // Contents of CORS header (Access-Control-Allow-Origin), if any.
+ std::string allow_origin;
+
// The stream data itself, stored in a circular buffer.
//
// We store our data in a file, so that we can send the data to the
// This is basically to force a buffer on the client, which can help
// if the client expects us to be able to fill up the buffer much
// faster than realtime (ie., it expects a static file).
- size_t prebuffering_bytes;
+ uint64_t prebuffering_bytes;
// How many bytes this stream have received. Can very well be larger
// than <backlog_size>, since the buffer wraps.
- size_t bytes_received = 0;
+ uint64_t bytes_received = 0;
// A list of points in the stream that is suitable to start new clients at
// (after having sent the header). Empty if no such point exists yet.
- std::deque<size_t> suitable_starting_points;
-
+ std::deque<uint64_t> suitable_starting_points;
+
+ // A list of HLS fragment boundaries currently in the backlog; the first fragment
+ // is between point 0 and 1, the second is between 1 and 2, and so on.
+ // This roughly mirrors suitable_starting_points, but we generally make much
+ // larger fragments (we try to get as close as possible without exceeding
+ // <hls_frag_duration> seconds by too much).
+ //
+ // We keep this list even if we don't have HLS, given that we have pts data
+ // from the input stream.
+ //
+ // NOTE: The last fragment is an in-progress fragment, which can still be
+ // extended and thus should not be output. So the last fragment output is
+ // from points N-3..N-2.
+ struct FragmentStart {
+ uint64_t byte_position;
+ double pts;
+ };
+ std::deque<FragmentStart> fragments;
+ size_t first_fragment_index = 0, discontinuity_counter = 0;
+
+ // HLS target duration, in seconds.
+ unsigned hls_frag_duration = 6;
+
+ // Don't advertise new HLS fragments beginning before this point after the
+ // start of the backlog, so that we're reasonably sure that we can actually
+ // serve them even if the client can't completely keep up.
+ size_t hls_backlog_margin = 0;
+
+ // HLS playlists for this stream, in the form of a HTTP response, with
+ // headers and all. These are created on-demand, re-used by clients as
+ // needed, and cleared when they are no longer valid (e.g., when new fragments
+ // are added).
+ std::shared_ptr<const std::string> hls_playlist_http10;
+ std::shared_ptr<const std::string> hls_playlist_http11_close;
+ std::shared_ptr<const std::string> hls_playlist_http11_persistent;
+
// Clients that are in SENDING_DATA, but that we don't listen on,
// because we currently don't have any data for them.
// See put_client_to_sleep() and wake_up_all_clients().
struct DataElement {
iovec data;
uint16_t metacube_flags;
+ RationalPTS pts;
};
std::vector<DataElement> queued_data;
// Add more data to <queued_data>, adding Metacube headers if needed.
// Does not take ownership of <data>.
- void add_data_deferred(const char *data, size_t bytes, uint16_t metacube_flags);
+ void add_data_deferred(const char *data, size_t bytes, uint16_t metacube_flags, const RationalPTS &pts);
// Add queued data to the stream, if any.
// You should hold the owning Server's <mutex>.
void process_queued_data();
+ // Generate a HLS playlist based on the current state, including HTTP headers.
+ std::shared_ptr<const std::string> generate_hls_playlist(bool http_11, bool close_after_response);
+
+ void clear_hls_playlist_cache();
+
private:
Stream(const Stream& other);
// in the backlog.
// You should hold the owning Server's <mutex>.
void remove_obsolete_starting_points();
+
+ // Extend the in-progress fragment to the given position, or finish it and start
+ // a new one if that would make it too long. Returns true if a new fragment
+ // was created (ie., the HLS playlists need to be regenerated).
+ bool add_fragment_boundary(size_t byte_position, const RationalPTS &pts);
};
#endif // !defined(_STREAM_H)