+++ /dev/null
-#ifndef _MUX_H
-#define _MUX_H 1
-
-// Wrapper around an AVFormat mux.
-
-extern "C" {
-#include <libavcodec/avcodec.h>
-#include <libavformat/avformat.h>
-}
-
-#include <sys/types.h>
-#include <atomic>
-#include <condition_variable>
-#include <functional>
-#include <mutex>
-#include <string>
-#include <utility>
-#include <thread>
-#include <vector>
-
-#include "shared/timebase.h"
-
-struct MuxMetrics {
- // “written” will usually be equal video + audio + mux overhead,
- // except that there could be buffered packets that count in audio or video
- // but not yet in written.
- std::atomic<int64_t> metric_video_bytes{0}, metric_audio_bytes{0}, metric_written_bytes{0};
-
- // Registers in global_metrics.
- void init(const std::vector<std::pair<std::string, std::string>> &labels);
-
- void reset()
- {
- metric_video_bytes = 0;
- metric_audio_bytes = 0;
- metric_written_bytes = 0;
- }
-};
-
-class Mux {
-public:
- enum Codec {
- 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, WriteStrategy write_strategy, const std::vector<MuxMetrics *> &metrics);
- ~Mux();
- void add_packet(const AVPacket &pkt, int64_t pts, int64_t dts, AVRational timebase = { 1, TIMEBASE }, int stream_index_override = -1);
-
- // 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:
- // 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;
-
- // 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>.
-
- // 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)