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
  43         // If the frame was started (data_copy != nullptr) but will not be finished
  44         // (MJPEG decoding was turned off in the meantime), you'll need to call finish_frame()
  45         // to release any VA-API resources.
  46         void finish_frame(RefCountedFrame frame);
  47
  48         bool using_vaapi() const { return va_dpy != nullptr; }
  49
  50         // Returns -1 for inactive (ie., don't encode frames for this card right now).
  51         int get_mjpeg_stream_for_card(unsigned card_index);
  52
  53 private:
  54         static constexpr int quality = 90;
  55
  56         struct VAResources {
  57                 unsigned width, height;
  58                 VASurfaceID surface;
  59                 VAContextID context;
  60                 VABufferID data_buffer;
  61                 VAImage image;
  62         };
  63
  64         // RAII wrapper to release VAResources on return (even on error).
  65         class ReleaseVAResources {
  66         public:
  67                 ReleaseVAResources() : committed(true) {}
  68
  69                 ReleaseVAResources(MJPEGEncoder *mjpeg, const VAResources &resources)
  70                         : mjpeg(mjpeg), resources(resources) {}
  71
  72                 ReleaseVAResources(ReleaseVAResources &) = delete;
  73
  74                 ReleaseVAResources(ReleaseVAResources &&other)
  75                         : mjpeg(other.mjpeg), resources(other.resources), committed(other.committed) {
  76                         other.commit();
  77                 }
  78
  79                 ReleaseVAResources &operator= (ReleaseVAResources &) = delete;
  80
  81                 ReleaseVAResources &operator= (ReleaseVAResources &&other) {
  82                         if (!committed) {
  83                                 mjpeg->release_va_resources(resources);
  84                         }
  85                         mjpeg = other.mjpeg;
  86                         resources = std::move(other.resources);
  87                         committed = other.committed;
  88                         other.commit();
  89                         return *this;
  90                 }
  91
  92                 ~ReleaseVAResources()
  93                 {
  94                         if (!committed) {
  95                                 mjpeg->release_va_resources(resources);
  96                         }
  97                 }
  98
  99                 void commit() { committed = true; }
 100
 101         private:
 102                 MJPEGEncoder *mjpeg = nullptr;
 103                 VAResources resources;
 104                 bool committed = false;
 105         };
 106
 107         struct QueuedFrame {
 108                 int64_t pts;
 109                 unsigned card_index;
 110                 RefCountedFrame frame;
 111                 bmusb::VideoFormat video_format;
 112                 size_t y_offset, cbcr_offset;
 113
 114                 // Only for frames in the process of being encoded by VA-API.
 115                 VAResources resources;
 116                 ReleaseVAResources resource_releaser;
 117         };
 118
 119         void encoder_thread_func();
 120         void va_receiver_thread_func();
 121         void encode_jpeg_va(QueuedFrame &&qf);
 122         std::vector<uint8_t> encode_jpeg_libjpeg(const QueuedFrame &qf);
 123         void write_mjpeg_packet(int64_t pts, unsigned card_index, const uint8_t *jpeg, size_t jpeg_size);
 124         void init_jpeg_422(unsigned width, unsigned height, VectorDestinationManager *dest, jpeg_compress_struct *cinfo);
 125         std::vector<uint8_t> get_jpeg_header(unsigned width, unsigned height, jpeg_compress_struct *cinfo);
 126
 127         static int write_packet2_thunk(void *opaque, uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 128         int write_packet2(uint8_t *buf, int buf_size, AVIODataMarkerType type, int64_t time);
 129
 130         std::thread encoder_thread, va_receiver_thread;
 131
 132         std::mutex mu;
 133         std::queue<QueuedFrame> frames_to_be_encoded;  // Under mu.
 134         std::condition_variable any_frames_to_be_encoded;  // Governs changes in both frames_to_be_encoded and frames_under_encoding
 135
 136         std::queue<QueuedFrame> frames_encoding;  // Under mu. Used for VA-API only.
 137         std::condition_variable any_frames_encoding;
 138
 139         AVFormatContextWithCloser avctx;
 140         HTTPD *httpd;
 141         std::string mux_header;
 142         std::atomic<bool> should_quit{false};
 143         bool running = false;
 144
 145         std::unique_ptr<VADisplayWithCleanup> va_dpy;
 146         VAConfigID config_id;
 147
 148         struct VAData {
 149                 std::vector<uint8_t> jpeg_header;
 150                 VAEncPictureParameterBufferJPEG pic_param;
 151                 VAQMatrixBufferJPEG q;
 152                 VAHuffmanTableBufferJPEGBaseline huff;
 153                 VAEncSliceParameterBufferJPEG parms;
 154         };
 155         std::map<std::pair<unsigned, unsigned>, VAData> va_data_for_resolution;
 156         VAData get_va_data_for_resolution(unsigned width, unsigned height);
 157
 158         std::list<VAResources> va_resources_freelist;
 159         std::mutex va_resources_mutex;
 160         VAResources get_va_resources(unsigned width, unsigned height);
 161         void release_va_resources(VAResources resources);
 162
 163         static std::unique_ptr<VADisplayWithCleanup> try_open_va(const std::string &va_display, std::string *error, VAConfigID *config_id);
 164
 165         uint8_t *tmp_y, *tmp_cbcr, *tmp_cb, *tmp_cr;  // Private to the encoder thread. Used by the libjpeg backend only.
 166
 167         std::atomic<int64_t> metric_mjpeg_frames_zero_size_dropped{0};
 168         std::atomic<int64_t> metric_mjpeg_frames_interlaced_dropped{0};
 169         std::atomic<int64_t> metric_mjpeg_frames_unsupported_pixel_format_dropped{0};
 170         std::atomic<int64_t> metric_mjpeg_frames_oversized_dropped{0};
 171         std::atomic<int64_t> metric_mjpeg_overrun_dropped{0};
 172         std::atomic<int64_t> metric_mjpeg_overrun_submitted{0};
 173
 174         friend class PBOFrameAllocator;  // FIXME
 175 };
 176
 177 #endif  // !defined(_MJPEG_ENCODER_H)