git.sesse.net Git - nageru/blob - nageru/mjpeg_encoder.h

   1 #ifndef _MJPEG_ENCODER_H
   2 #define _MJPEG_ENCODER_H 1
   3
   4 #include "shared/ffmpeg_raii.h"
   5 #include "ref_counted_frame.h"
   6
   7 extern "C" {
   8
   9 #include <libavformat/avio.h>
  10
  11 }  // extern "C"
  12
  13 #include <atomic>
  14 #include <bmusb/bmusb.h>
  15 #include <condition_variable>
  16 #include <list>
  17 #include <mutex>
  18 #include <queue>
  19 #include <stdint.h>
  20 #include <string>
  21 #include <thread>
  22
  23 #include <va/va.h>
  24
  25 class HTTPD;
  26 struct jpeg_compress_struct;
  27 struct VADisplayWithCleanup;
  28 struct VectorDestinationManager;
  29
  30 class MJPEGEncoder {
  31 public:
  32         MJPEGEncoder(HTTPD *httpd, const std::string &va_display);
  33         ~MJPEGEncoder();
  34         void stop();
  35         void upload_frame(int64_t pts, unsigned card_index, RefCountedFrame frame, const bmusb::VideoFormat &video_format, size_t y_offset, size_t cbcr_offset);
  36
  37 private:
  38         static constexpr int quality = 90;
  39
  40         struct VAResources {
  41                 unsigned width, height;
  42                 VASurfaceID surface;
  43                 VAContextID context;
  44                 VABufferID data_buffer;
  45         };
  46
  47         // RAII wrapper to release VAResources on return (even on error).
  48         class ReleaseVAResources {
  49         public:
  50                 ReleaseVAResources() : committed(true) {}
  51
  52                 ReleaseVAResources(MJPEGEncoder *mjpeg, const VAResources &resources)
  53                         : mjpeg(mjpeg), resources(resources) {}
  54
  55                 ReleaseVAResources(ReleaseVAResources &) = delete;
  56
  57                 ReleaseVAResources(ReleaseVAResources &&other)
  58                         : mjpeg(other.mjpeg), resources(other.resources), committed(other.committed) {
  59                         other.commit();
  60                 }
  61
  62                 ReleaseVAResources &operator= (ReleaseVAResources &) = delete;
  63
  64                 ReleaseVAResources &operator= (ReleaseVAResources &&other) {
  65                         if (!committed) {
  66                                 mjpeg->release_va_resources(resources);
  67                         }
  68                         mjpeg = other.mjpeg;
  69                         resources = std::move(other.resources);
  70                         committed = other.committed;
  71                         other.commit();
  72                         return *this;
  73                 }
  74
  75                 ~ReleaseVAResources()
  76                 {
  77                         if (!committed) {
  78                                 mjpeg->release_va_resources(resources);
  79                         }
  80                 }
  81
  82                 void commit() { committed = true; }
  83
  84         private:
  85                 MJPEGEncoder *mjpeg = nullptr;
  86                 VAResources resources;
  87                 bool committed = false;
  88         };
  89
  90         struct QueuedFrame {
  91                 int64_t pts;
  92                 unsigned card_index;
  93                 RefCountedFrame frame;
  94                 bmusb::VideoFormat video_format;
  95                 size_t y_offset, cbcr_offset;
  96
  97                 // Only for frames in the process of being encoded by VA-API.
  98                 VAResources resources;
  99                 ReleaseVAResources resource_releaser;
 100         };
 101
 102         void encoder_thread_func();
 103         void va_receiver_thread_func();
 104         void encode_jpeg_va(QueuedFrame &&qf);
 105         std::vector<uint8_t> encode_jpeg_libjpeg(const QueuedFrame &qf);
 106         void write_mjpeg_packet(int64_t pts, unsigned card_index, const uint8_t *jpeg, size_t jpeg_size);
 107         void init_jpeg_422(unsigned width, unsigned height, VectorDestinationManager *dest, jpeg_compress_struct *cinfo);
 108         std::vector<uint8_t> get_jpeg_header(unsigned width, unsigned height, jpeg_compress_struct *cinfo);
 109
 110         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 111         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 112
 113         std::thread encoder_thread, va_receiver_thread;
 114
 115         std::mutex mu;
 116         std::queue<QueuedFrame> frames_to_be_encoded;  // Under mu.
 117         std::condition_variable any_frames_to_be_encoded;  // Governs changes in both frames_to_be_encoded and frames_under_encoding
 118
 119         std::queue<QueuedFrame> frames_encoding;  // Under mu. Used for VA-API only.
 120         std::condition_variable any_frames_encoding;
 121
 122         AVFormatContextWithCloser avctx;
 123         HTTPD *httpd;
 124         std::string mux_header;
 125         std::atomic<bool> should_quit{false};
 126         bool running = false;
 127
 128         std::unique_ptr<VADisplayWithCleanup> va_dpy;
 129         VAConfigID config_id;
 130
 131         struct VAData {
 132                 std::vector<uint8_t> jpeg_header;
 133                 VAEncPictureParameterBufferJPEG pic_param;
 134                 VAQMatrixBufferJPEG q;
 135                 VAHuffmanTableBufferJPEGBaseline huff;
 136                 VAEncSliceParameterBufferJPEG parms;
 137         };
 138         std::map<std::pair<unsigned, unsigned>, VAData> va_data_for_resolution;
 139         VAData get_va_data_for_resolution(unsigned width, unsigned height);
 140
 141         std::list<VAResources> va_resources_freelist;
 142         std::mutex va_resources_mutex;
 143         VAResources get_va_resources(unsigned width, unsigned height);
 144         void release_va_resources(VAResources resources);
 145
 146         static std::unique_ptr<VADisplayWithCleanup> try_open_va(const std::string &va_display, std::string *error, VAConfigID *config_id);
 147
 148         uint8_t *tmp_y, *tmp_cbcr, *tmp_cb, *tmp_cr;  // Private to the encoder thread. Used by the libjpeg backend only.
 149
 150         std::atomic<int64_t> metric_mjpeg_frames_zero_size_dropped{0};
 151         std::atomic<int64_t> metric_mjpeg_frames_interlaced_dropped{0};
 152         std::atomic<int64_t> metric_mjpeg_frames_unsupported_pixel_format_dropped{0};
 153         std::atomic<int64_t> metric_mjpeg_frames_oversized_dropped{0};
 154         std::atomic<int64_t> metric_mjpeg_overrun_dropped{0};
 155         std::atomic<int64_t> metric_mjpeg_overrun_submitted{0};
 156 };
 157
 158 #endif  // !defined(_MJPEG_ENCODER_H)