#include <libavformat/avio.h>
}
-class KeyFrameSignalReceiver {
-public:
- // Needs to automatically turn the flag off again after actually receiving data.
- virtual void signal_keyframe() = 0;
-};
+#include <functional>
+#include <mutex>
+#include <queue>
+#include <vector>
class Mux {
public:
CODEC_NV12, // Uncompressed 4:2:0.
};
- // Takes ownership of avctx. <keyframe_signal_receiver> can be nullptr.
- Mux(AVFormatContext *avctx, int width, int height, Codec video_codec, const AVCodec *codec_audio, int time_base, int bit_rate, KeyFrameSignalReceiver *keyframe_signal_receiver);
+ // 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.)
+ 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);
~Mux();
void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts);
+ // As long as the mux is plugged, it will not actually write anything to disk,
+ // just queue the packets. Once it is unplugged, the packets are reordered by pts
+ // and written. This is primarily useful if you might have two different encoders
+ // writing to the mux at the same time (because one is shutting down), so that
+ // pts might otherwise come out-of-order.
+ //
+ // You can plug and unplug multiple times; only when the plug count reaches zero,
+ // something will actually happen.
+ void plug();
+ void unplug();
+
private:
- AVFormatContext *avctx;
+ void write_packet_or_die(const AVPacket &pkt); // Must be called with <mu> held.
+
+ std::mutex mu;
+ AVFormatContext *avctx; // Protected by <mu>.
+ int plug_count = 0; // Protected by <mu>.
+ std::vector<AVPacket *> plugged_packets; // Protected by <mu>.
+
AVStream *avstream_video, *avstream_audio;
- KeyFrameSignalReceiver *keyframe_signal_receiver;
+
+ std::function<void(int64_t)> write_callback;
};
#endif // !defined(_MUX_H)