#include <sys/types.h>
#include <atomic>
+#include <condition_variable>
#include <functional>
#include <mutex>
#include <string>
#include <utility>
+#include <thread>
#include <vector>
struct MuxMetrics {
CODEC_H264,
CODEC_NV12, // Uncompressed 4:2:0.
};
+ enum WriteStrategy {
+ // add_packet() will write the packet immediately, unless plugged.
+ WRITE_FOREGROUND,
+
+ // All writes will happen on a separate thread, so add_packet()
+ // won't block. Use this if writing to a file and you might be
+ // holding a mutex (because blocking I/O with a mutex held is
+ // not good). Note that this will clone every packet, so it has
+ // higher overhead.
+ WRITE_BACKGROUND,
+ };
// Takes ownership of avctx. <write_callback> will be called every time
// a write has been made to the video stream (id 0), with the pts of
// the just-written frame. (write_callback can be nullptr.)
// Does not take ownership of <metrics>; elements in there, if any,
// will be added to.
- Mux(AVFormatContext *avctx, int width, int height, Codec video_codec, const std::string &video_extradata, const AVCodecParameters *audio_codecpar, int time_base, std::function<void(int64_t)> write_callback, const std::vector<MuxMetrics *> &metrics);
+ Mux(AVFormatContext *avctx, int width, int height, Codec video_codec, const std::string &video_extradata, const AVCodecParameters *audio_codecpar, int time_base, std::function<void(int64_t)> write_callback, WriteStrategy write_strategy, const std::vector<MuxMetrics *> &metrics);
~Mux();
void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
void unplug();
private:
- void write_packet_or_die(const AVPacket &pkt); // Must be called with <mu> held.
+ // If write_strategy == WRITE_FOREGORUND, Must be called with <mu> held.
+ void write_packet_or_die(const AVPacket &pkt, int64_t unscaled_pts);
+ void thread_func();
+
+ WriteStrategy write_strategy;
std::mutex mu;
- AVFormatContext *avctx; // Protected by <mu>.
+
+ // These are only in use if write_strategy == WRITE_BACKGROUND.
+ std::atomic<bool> writer_thread_should_quit{false};
+ std::thread writer_thread;
+
+ AVFormatContext *avctx; // Protected by <mu>, iff write_strategy == WRITE_BACKGROUND.
int plug_count = 0; // Protected by <mu>.
- std::vector<AVPacket *> plugged_packets; // Protected by <mu>.
+
+ // Protected by <mu>. If write_strategy == WRITE_FOREGROUND,
+ // this is only in use when plugging.
+ struct QueuedPacket {
+ AVPacket *pkt;
+ int64_t unscaled_pts;
+ };
+ std::vector<QueuedPacket> packet_queue;
+ std::condition_variable packet_queue_ready;
AVStream *avstream_video, *avstream_audio;
std::function<void(int64_t)> write_callback;
std::vector<MuxMetrics *> metrics;
+
+ friend struct PacketBefore;
};
#endif // !defined(_MUX_H)