1 #include "image_input.h"
4 #include <movit/image_format.h>
11 #include <libavcodec/avcodec.h>
12 #include <libavformat/avformat.h>
13 #include <libavutil/avutil.h>
14 #include <libavutil/error.h>
15 #include <libavutil/frame.h>
16 #include <libavutil/imgutils.h>
17 #include <libavutil/mem.h>
18 #include <libavutil/pixfmt.h>
19 #include <libswscale/swscale.h>
32 #include "ffmpeg_raii.h"
34 #include "flat_input.h"
40 string search_for_file(const string &filename)
42 if (!filename.empty() && filename[0] == '/') {
47 // Look for the file in all theme_dirs until we find one;
48 // that will be the permanent resolution of this file, whether
49 // it is actually valid or not.
50 // We store errors from all the attempts, and show them
51 // once we know we can't find any of them.
52 vector<string> errors;
53 for (const string &dir : global_flags.theme_dirs) {
54 string pathname = dir + "/" + filename;
55 if (access(pathname.c_str(), O_RDONLY) == 0) {
59 snprintf(buf, sizeof(buf), "%s: %s", pathname.c_str(), strerror(errno));
60 errors.push_back(buf);
64 for (const string &error : errors) {
65 fprintf(stderr, "%s\n", error.c_str());
70 string search_for_file_or_die(const string &filename)
72 string pathname = search_for_file(filename);
73 if (pathname.empty()) {
74 fprintf(stderr, "Couldn't find %s in any directory in --theme-dirs, exiting.\n",
81 ImageInput::ImageInput(const string &filename)
82 : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
83 GL_UNSIGNED_BYTE, 1280, 720), // Resolution will be overwritten.
85 pathname(search_for_file_or_die(filename)),
86 current_image(load_image(filename, pathname))
88 if (current_image == nullptr) { // Could happen even though search_for_file() returned.
89 fprintf(stderr, "Couldn't load image, exiting.\n");
92 set_width(current_image->width);
93 set_height(current_image->height);
94 set_pixel_data(current_image->pixels.get());
97 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
99 // See if the background thread has given us a new version of our image.
100 // Note: The old version might still be lying around in other ImageInputs
101 // (in fact, it's likely), but at least the total amount of memory used
102 // is bounded. Currently we don't even share textures between them,
103 // so there's a fair amount of OpenGL memory waste anyway (the cache
104 // is mostly there to save startup time, not RAM).
106 unique_lock<mutex> lock(all_images_lock);
107 if (all_images[pathname] != current_image) {
108 current_image = all_images[pathname];
109 set_pixel_data(current_image->pixels.get());
112 movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
115 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &filename, const string &pathname)
117 unique_lock<mutex> lock(all_images_lock); // Held also during loading.
118 if (all_images.count(pathname)) {
119 return all_images[pathname];
122 all_images[pathname] = load_image_raw(pathname);
123 timespec first_modified = all_images[pathname]->last_modified;
124 update_threads[pathname] =
125 thread(bind(update_thread_func, filename, pathname, first_modified));
127 return all_images[pathname];
130 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
132 // Note: Call before open, not after; otherwise, there's a race.
133 // (There is now, too, but it tips the correct way. We could use fstat()
134 // if we had the file descriptor.)
136 if (stat(pathname.c_str(), &buf) != 0) {
137 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
140 timespec last_modified = buf.st_mtim;
142 auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
143 if (format_ctx == nullptr) {
144 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
148 if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
149 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
153 int stream_index = -1;
154 for (unsigned i = 0; i < format_ctx->nb_streams; ++i) {
155 if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
160 if (stream_index == -1) {
161 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
165 const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
166 AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
167 if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
168 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
171 AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
172 if (codec == nullptr) {
173 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
176 if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
177 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
180 unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
181 codec_ctx.get(), avcodec_close);
183 // Read packets until we have a frame or there are none left.
184 int frame_finished = 0;
185 AVFrameWithDeleter frame = av_frame_alloc_unique();
189 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
190 &pkt, av_packet_unref);
191 av_init_packet(&pkt);
194 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
195 if (pkt.stream_index != stream_index) {
198 if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
199 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
203 eof = true; // Or error, but ignore that for the time being.
206 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
208 frame_finished = true;
210 } else if (err != AVERROR(EAGAIN)) {
211 fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
216 if (!frame_finished) {
217 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
221 uint8_t *pic_data[4] = {nullptr};
222 unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
223 &pic_data[0], av_freep);
225 if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
226 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
229 unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
230 sws_getContext(frame->width, frame->height,
231 (AVPixelFormat)frame->format, frame->width, frame->height,
232 AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
234 if (sws_ctx == nullptr) {
235 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
238 sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
240 size_t len = frame->width * frame->height * 4;
241 unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
242 av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
244 shared_ptr<Image> image(new Image{unsigned(frame->width), unsigned(frame->height), move(image_data), last_modified});
248 // Fire up a thread to update the image every second.
249 // We could do inotify, but this is good enough for now.
250 void ImageInput::update_thread_func(const std::string &filename, const std::string &pathname, const timespec &first_modified)
252 char thread_name[16];
253 snprintf(thread_name, sizeof(thread_name), "Update_%s", filename.c_str());
254 pthread_setname_np(pthread_self(), thread_name);
256 timespec last_modified = first_modified;
260 unique_lock<mutex> lock(threads_should_quit_mu);
261 threads_should_quit_modified.wait_for(lock, chrono::seconds(1), []() { return threads_should_quit; });
264 if (threads_should_quit) {
268 if (stat(pathname.c_str(), &buf) != 0) {
269 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
272 if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
273 buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
277 shared_ptr<const Image> image = load_image_raw(pathname);
278 if (image == nullptr) {
279 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
282 fprintf(stderr, "Loaded new version of %s from disk.\n", pathname.c_str());
283 unique_lock<mutex> lock(all_images_lock);
284 all_images[pathname] = image;
285 last_modified = image->last_modified;
289 void ImageInput::shutdown_updaters()
292 unique_lock<mutex> lock(threads_should_quit_mu);
293 threads_should_quit = true;
294 threads_should_quit_modified.notify_all();
296 for (auto &it : update_threads) {
301 mutex ImageInput::all_images_lock;
302 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
303 map<string, thread> ImageInput::update_threads;
304 mutex ImageInput::threads_should_quit_mu;
305 bool ImageInput::threads_should_quit = false;
306 condition_variable ImageInput::threads_should_quit_modified;