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

   1 #ifndef _MJPEG_ENCODER_H
   2 #define _MJPEG_ENCODER_H 1
   3
   4 #include "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         void stop();
  34         void upload_frame(int64_t pts, unsigned card_index, RefCountedFrame frame, const bmusb::VideoFormat &video_format, size_t y_offset, size_t cbcr_offset);
  35
  36 private:
  37         static constexpr int quality = 90;
  38
  39         struct QueuedFrame {
  40                 int64_t pts;
  41                 unsigned card_index;
  42                 RefCountedFrame frame;
  43                 bmusb::VideoFormat video_format;
  44                 size_t y_offset, cbcr_offset;
  45         };
  46
  47         void encoder_thread_func();
  48         std::vector<uint8_t> encode_jpeg(const QueuedFrame &qf);
  49         std::vector<uint8_t> encode_jpeg_va(const QueuedFrame &qf);
  50         std::vector<uint8_t> encode_jpeg_libjpeg(const QueuedFrame &qf);
  51         void init_jpeg_422(unsigned width, unsigned height, VectorDestinationManager *dest, jpeg_compress_struct *cinfo);
  52         std::vector<uint8_t> get_jpeg_header(unsigned width, unsigned height, jpeg_compress_struct *cinfo);
  53
  54         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  55         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
  56
  57         std::thread encoder_thread;
  58
  59         std::mutex mu;
  60         std::queue<QueuedFrame> frames_to_be_encoded;  // Under mu.
  61         std::condition_variable any_frames_to_be_encoded;
  62
  63         std::queue<QueuedFrame> frames_encoding;  // Under mu.
  64         std::condition_variable any_frames_encoding;
  65
  66         AVFormatContextWithCloser avctx;
  67         HTTPD *httpd;
  68         std::string mux_header;
  69         std::atomic<bool> should_quit{false};
  70         bool running = false;
  71
  72         std::unique_ptr<VADisplayWithCleanup> va_dpy;
  73         VAConfigID config_id;
  74
  75         struct VAData {
  76                 std::vector<uint8_t> jpeg_header;
  77                 VAEncPictureParameterBufferJPEG pic_param;
  78                 VAQMatrixBufferJPEG q;
  79                 VAHuffmanTableBufferJPEGBaseline huff;
  80                 VAEncSliceParameterBufferJPEG parms;
  81         };
  82         std::map<std::pair<unsigned, unsigned>, VAData> va_data_for_resolution;
  83         VAData get_va_data_for_resolution(unsigned width, unsigned height);
  84
  85         struct VAResources {
  86                 unsigned width, height;
  87                 VASurfaceID surface;
  88                 VAContextID context;
  89                 VABufferID data_buffer;
  90         };
  91         std::list<VAResources> va_resources_freelist;
  92         std::mutex va_resources_mutex;
  93         VAResources get_va_resources(unsigned width, unsigned height);
  94         void release_va_resources(VAResources resources);
  95
  96         // RAII wrapper to release VAResources on return (even on error).
  97         class ReleaseVAResources {
  98         public:
  99                 ReleaseVAResources(MJPEGEncoder *mjpeg, const VAResources &resources)
 100                         : mjpeg(mjpeg), resources(resources) {}
 101                 ~ReleaseVAResources()
 102                 {
 103                         if (!committed) {
 104                                 mjpeg->release_va_resources(resources);
 105                         }
 106                 }
 107
 108                 void commit() { committed = true; }
 109
 110         private:
 111                 MJPEGEncoder * const mjpeg;
 112                 const VAResources &resources;
 113                 bool committed = false;
 114         };
 115
 116         static std::unique_ptr<VADisplayWithCleanup> try_open_va(const std::string &va_display, std::string *error, VAConfigID *config_id);
 117
 118         uint8_t *tmp_y, *tmp_cbcr, *tmp_cb, *tmp_cr;  // Private to the encoder thread.
 119 };
 120
 121 #endif  // !defined(_MJPEG_ENCODER_H)