git.sesse.net Git - nageru/blob - nageru/image_input.cpp

   1 #include "image_input.h"
   2
   3 #include <errno.h>
   4 #include <movit/flat_input.h>
   5 #include <movit/image_format.h>
   6 #include <movit/util.h>
   7 #include <stdint.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11
  12 extern "C" {
  13 #include <libavcodec/avcodec.h>
  14 #include <libavformat/avformat.h>
  15 #include <libavutil/avutil.h>
  16 #include <libavutil/error.h>
  17 #include <libavutil/frame.h>
  18 #include <libavutil/imgutils.h>
  19 #include <libavutil/mem.h>
  20 #include <libavutil/pixfmt.h>
  21 #include <libswscale/swscale.h>
  22 }
  23
  24 #include <epoxy/egl.h>
  25 #include <fcntl.h>
  26 #include <sys/stat.h>
  27 #include <unistd.h>
  28 #include <cstddef>
  29 #include <functional>
  30 #include <mutex>
  31 #include <thread>
  32 #include <utility>
  33 #include <vector>
  34
  35 #include "shared/context.h"
  36 #include "shared/ffmpeg_raii.h"
  37 #include "ffmpeg_util.h"
  38 #include "flags.h"
  39
  40 struct SwsContext;
  41
  42 using namespace std;
  43
  44 // FIXME gl context
  45 ImageInput::ImageInput(const string &filename)
  46         : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
  47                            GL_UNSIGNED_BYTE, 1280, 720),  // Resolution will be overwritten.
  48           pathname(search_for_file_or_die(filename)),
  49           current_image(load_image(filename, pathname))
  50 {
  51         if (current_image == nullptr) {  // Could happen even though search_for_file() returned.
  52                 fprintf(stderr, "Couldn't load image, exiting.\n");
  53                 abort();
  54         }
  55         set_width(current_image->width);
  56         set_height(current_image->height);
  57         set_texture_num(*current_image->tex);
  58 }
  59
  60 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  61 {
  62         // See if the background thread has given us a new version of our image.
  63         // Note: The old version might still be lying around in other ImageInputs
  64         // (in fact, it's likely), but at least the total amount of memory used
  65         // is bounded. Currently we don't even share textures between them,
  66         // so there's a fair amount of OpenGL memory waste anyway (the cache
  67         // is mostly there to save startup time, not RAM).
  68         {
  69                 lock_guard<mutex> lock(all_images_lock);
  70                 if (all_images[pathname] != current_image) {
  71                         current_image = all_images[pathname];
  72                         set_texture_num(*current_image->tex);
  73                 }
  74         }
  75         movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
  76 }
  77
  78 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &filename, const string &pathname)
  79 {
  80         lock_guard<mutex> lock(all_images_lock);  // Held also during loading.
  81         if (all_images.count(pathname)) {
  82                 return all_images[pathname];
  83         }
  84
  85         all_images[pathname] = load_image_raw(pathname);
  86         return all_images[pathname];
  87 }
  88
  89 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
  90 {
  91         // Note: Call before open, not after; otherwise, there's a race.
  92         // (There is now, too, but it tips the correct way. We could use fstat()
  93         // if we had the file descriptor.)
  94         struct stat buf;
  95         if (stat(pathname.c_str(), &buf) != 0) {
  96                 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
  97                 return nullptr;
  98         }
  99         timespec last_modified = buf.st_mtim;
 100
 101         auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
 102         if (format_ctx == nullptr) {
 103                 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
 104                 return nullptr;
 105         }
 106
 107         if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
 108                 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
 109                 return nullptr;
 110         }
 111
 112         int stream_index = find_stream_index(format_ctx.get(), AVMEDIA_TYPE_VIDEO);
 113         if (stream_index == -1) {
 114                 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
 115                 return nullptr;
 116         }
 117
 118         const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
 119         AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
 120         if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
 121                 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
 122                 return nullptr;
 123         }
 124         AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
 125         if (codec == nullptr) {
 126                 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
 127                 return nullptr;
 128         }
 129         if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
 130                 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
 131                 return nullptr;
 132         }
 133         unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
 134                 codec_ctx.get(), avcodec_close);
 135
 136         // Read packets until we have a frame or there are none left.
 137         int frame_finished = 0;
 138         AVFrameWithDeleter frame = av_frame_alloc_unique();
 139         bool eof = false;
 140         do {
 141                 AVPacket pkt;
 142                 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
 143                         &pkt, av_packet_unref);
 144                 av_init_packet(&pkt);
 145                 pkt.data = nullptr;
 146                 pkt.size = 0;
 147                 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
 148                         if (pkt.stream_index != stream_index) {
 149                                 continue;
 150                         }
 151                         if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
 152                                 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
 153                                 return nullptr;
 154                         }
 155                 } else {
 156                         eof = true;  // Or error, but ignore that for the time being.
 157                 }
 158
 159                 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
 160                 if (err == 0) {
 161                         frame_finished = true;
 162                         break;
 163                 } else if (err != AVERROR(EAGAIN)) {
 164                         fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
 165                         return nullptr;
 166                 }
 167         } while (!eof);
 168
 169         if (!frame_finished) {
 170                 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
 171                 return nullptr;
 172         }
 173
 174         uint8_t *pic_data[4] = {nullptr};
 175         unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
 176                 &pic_data[0], av_freep);
 177         int linesizes[4];
 178         if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
 179                 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
 180                 return nullptr;
 181         }
 182         unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
 183                 sws_getContext(frame->width, frame->height,
 184                         (AVPixelFormat)frame->format, frame->width, frame->height,
 185                         AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
 186                 sws_freeContext);
 187         if (sws_ctx == nullptr) {
 188                 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
 189                 return nullptr;
 190         }
 191         sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
 192
 193         size_t len = frame->width * frame->height * 4;
 194         unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
 195         av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
 196
 197         // Create and upload the texture. We always make mipmaps, since we have
 198         // generally no idea of all the different chains that might crop up.
 199         GLuint tex;
 200         glGenTextures(1, &tex);
 201         check_error();
 202         glBindTexture(GL_TEXTURE_2D, tex);
 203         check_error();
 204         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
 205         check_error();
 206         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 207         check_error();
 208         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 209         check_error();
 210
 211         // Actual upload.
 212         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 213         check_error();
 214         glPixelStorei(GL_UNPACK_ROW_LENGTH, linesizes[0] / 4);
 215         check_error();
 216         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, frame->width, frame->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image_data.get());
 217         check_error();
 218         glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 219         check_error();
 220
 221         glGenerateMipmap(GL_TEXTURE_2D);
 222         check_error();
 223         glBindTexture(GL_TEXTURE_2D, 0);
 224         check_error();
 225
 226         shared_ptr<Image> image(new Image{unsigned(frame->width), unsigned(frame->height), RefCountedTexture(new GLuint(tex)), last_modified});
 227         return image;
 228 }
 229
 230 // Fire up a thread to update all images every second.
 231 // We could do inotify, but this is good enough for now.
 232 void ImageInput::update_thread_func(QSurface *surface)
 233 {
 234         pthread_setname_np(pthread_self(), "Update_Images");
 235
 236         eglBindAPI(EGL_OPENGL_API);
 237         QOpenGLContext *context = create_context(surface);
 238         if (!make_current(context, surface)) {
 239                 printf("Couldn't initialize OpenGL context!\n");
 240                 abort();
 241         }
 242
 243         struct stat buf;
 244         for ( ;; ) {
 245                 {
 246                         unique_lock<mutex> lock(update_thread_should_quit_mu);
 247                         update_thread_should_quit_modified.wait_for(lock, chrono::seconds(1), [] { return update_thread_should_quit; });
 248                 }
 249                 if (update_thread_should_quit) {
 250                         return;
 251                 }
 252
 253                 // Go through all loaded images and see if they need to be updated.
 254                 // We do one pass first through the array with no I/O, to avoid
 255                 // blocking the renderer.
 256                 vector<pair<string, timespec>> images_to_check;
 257                 {
 258                         unique_lock<mutex> lock(all_images_lock);
 259                         for (const auto &pathname_and_image : all_images) {
 260                                 const string pathname = pathname_and_image.first;
 261                                 const timespec last_modified = pathname_and_image.second->last_modified;
 262                                 images_to_check.emplace_back(pathname, last_modified);
 263                         }
 264                 }
 265
 266                 for (const auto &pathname_and_timespec : images_to_check) {
 267                         const string pathname = pathname_and_timespec.first;
 268                         const timespec last_modified = pathname_and_timespec.second;
 269
 270                         if (stat(pathname.c_str(), &buf) != 0) {
 271                                 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
 272                                 continue;
 273                         }
 274                         if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
 275                             buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
 276                                 // Not changed.
 277                                 continue;
 278                         }
 279
 280                         shared_ptr<const Image> image = load_image_raw(pathname);
 281                         if (image == nullptr) {
 282                                 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
 283                                 continue;
 284                         }
 285
 286                         unique_lock<mutex> lock(all_images_lock);
 287                         all_images[pathname] = image;
 288                 }
 289         }
 290 }
 291
 292 void ImageInput::start_update_thread(QSurface *surface)
 293 {
 294         update_thread = thread(update_thread_func, surface);
 295 }
 296
 297 void ImageInput::end_update_thread()
 298
 299 {
 300         {
 301                 lock_guard<mutex> lock(update_thread_should_quit_mu);
 302                 update_thread_should_quit = true;
 303                 update_thread_should_quit_modified.notify_all();
 304         }
 305         update_thread.join();
 306 }
 307
 308 mutex ImageInput::all_images_lock;
 309 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
 310 thread ImageInput::update_thread;
 311 mutex ImageInput::update_thread_should_quit_mu;
 312 bool ImageInput::update_thread_should_quit = false;
 313 condition_variable ImageInput::update_thread_should_quit_modified;