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 #define CHECK_VASTATUS(va_status, func)                                 \
  31     if (va_status != VA_STATUS_SUCCESS) {                               \
  32         fprintf(stderr, "%s:%d (%s) failed with %d\n", __func__, __LINE__, func, va_status); \
  33         exit(1);                                                        \
  34     }
  35
  36 class MJPEGEncoder {
  37 public:
  38         MJPEGEncoder(HTTPD *httpd, const std::string &va_display);
  39         ~MJPEGEncoder();
  40         void stop();
  41         void upload_frame(int64_t pts, unsigned card_index, RefCountedFrame frame, const bmusb::VideoFormat &video_format, size_t y_offset, size_t cbcr_offset);
  42         bool using_vaapi() const { return va_dpy != nullptr; }
  43
  44         // Returns -1 for inactive (ie., don't encode frames for this card right now).
  45         int get_mjpeg_stream_for_card(unsigned card_index);
  46
  47 private:
  48         static constexpr int quality = 90;
  49
  50         struct VAResources {
  51                 unsigned width, height;
  52                 VASurfaceID surface;
  53                 VAContextID context;
  54                 VABufferID data_buffer;
  55                 VAImage image;
  56         };
  57
  58         // RAII wrapper to release VAResources on return (even on error).
  59         class ReleaseVAResources {
  60         public:
  61                 ReleaseVAResources() : committed(true) {}
  62
  63                 ReleaseVAResources(MJPEGEncoder *mjpeg, const VAResources &resources)
  64                         : mjpeg(mjpeg), resources(resources) {}
  65
  66                 ReleaseVAResources(ReleaseVAResources &) = delete;
  67
  68                 ReleaseVAResources(ReleaseVAResources &&other)
  69                         : mjpeg(other.mjpeg), resources(other.resources), committed(other.committed) {
  70                         other.commit();
  71                 }
  72
  73                 ReleaseVAResources &operator= (ReleaseVAResources &) = delete;
  74
  75                 ReleaseVAResources &operator= (ReleaseVAResources &&other) {
  76                         if (!committed) {
  77                                 mjpeg->release_va_resources(resources);
  78                         }
  79                         mjpeg = other.mjpeg;
  80                         resources = std::move(other.resources);
  81                         committed = other.committed;
  82                         other.commit();
  83                         return *this;
  84                 }
  85
  86                 ~ReleaseVAResources()
  87                 {
  88                         if (!committed) {
  89                                 mjpeg->release_va_resources(resources);
  90                         }
  91                 }
  92
  93                 void commit() { committed = true; }
  94
  95         private:
  96                 MJPEGEncoder *mjpeg = nullptr;
  97                 VAResources resources;
  98                 bool committed = false;
  99         };
 100
 101         struct QueuedFrame {
 102                 int64_t pts;
 103                 unsigned card_index;
 104                 RefCountedFrame frame;
 105                 bmusb::VideoFormat video_format;
 106                 size_t y_offset, cbcr_offset;
 107
 108                 // Only for frames in the process of being encoded by VA-API.
 109                 VAResources resources;
 110                 ReleaseVAResources resource_releaser;
 111         };
 112
 113         void encoder_thread_func();
 114         void va_receiver_thread_func();
 115         void encode_jpeg_va(QueuedFrame &&qf);
 116         std::vector<uint8_t> encode_jpeg_libjpeg(const QueuedFrame &qf);
 117         void write_mjpeg_packet(int64_t pts, unsigned card_index, const uint8_t *jpeg, size_t jpeg_size);
 118         void init_jpeg_422(unsigned width, unsigned height, VectorDestinationManager *dest, jpeg_compress_struct *cinfo);
 119         std::vector<uint8_t> get_jpeg_header(unsigned width, unsigned height, jpeg_compress_struct *cinfo);
 120
 121         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 122         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 123
 124         std::thread encoder_thread, va_receiver_thread;
 125
 126         std::mutex mu;
 127         std::queue<QueuedFrame> frames_to_be_encoded;  // Under mu.
 128         std::condition_variable any_frames_to_be_encoded;  // Governs changes in both frames_to_be_encoded and frames_under_encoding
 129
 130         std::queue<QueuedFrame> frames_encoding;  // Under mu. Used for VA-API only.
 131         std::condition_variable any_frames_encoding;
 132
 133         AVFormatContextWithCloser avctx;
 134         HTTPD *httpd;
 135         std::string mux_header;
 136         std::atomic<bool> should_quit{false};
 137         bool running = false;
 138
 139         std::unique_ptr<VADisplayWithCleanup> va_dpy;
 140         VAConfigID config_id;
 141
 142         struct VAData {
 143                 std::vector<uint8_t> jpeg_header;
 144                 VAEncPictureParameterBufferJPEG pic_param;
 145                 VAQMatrixBufferJPEG q;
 146                 VAHuffmanTableBufferJPEGBaseline huff;
 147                 VAEncSliceParameterBufferJPEG parms;
 148         };
 149         std::map<std::pair<unsigned, unsigned>, VAData> va_data_for_resolution;
 150         VAData get_va_data_for_resolution(unsigned width, unsigned height);
 151
 152         std::list<VAResources> va_resources_freelist;
 153         std::mutex va_resources_mutex;
 154         VAResources get_va_resources(unsigned width, unsigned height);
 155         void release_va_resources(VAResources resources);
 156
 157         static std::unique_ptr<VADisplayWithCleanup> try_open_va(const std::string &va_display, std::string *error, VAConfigID *config_id);
 158
 159         uint8_t *tmp_y, *tmp_cbcr, *tmp_cb, *tmp_cr;  // Private to the encoder thread. Used by the libjpeg backend only.
 160
 161         std::atomic<int64_t> metric_mjpeg_frames_zero_size_dropped{0};
 162         std::atomic<int64_t> metric_mjpeg_frames_interlaced_dropped{0};
 163         std::atomic<int64_t> metric_mjpeg_frames_unsupported_pixel_format_dropped{0};
 164         std::atomic<int64_t> metric_mjpeg_frames_oversized_dropped{0};
 165         std::atomic<int64_t> metric_mjpeg_overrun_dropped{0};
 166         std::atomic<int64_t> metric_mjpeg_overrun_submitted{0};
 167
 168         friend class PBOFrameAllocator;  // FIXME
 169 };
 170
 171 #endif  // !defined(_MJPEG_ENCODER_H)