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 // See if we match ^[a-z]:/, which is probably a URL of some sort
48 // (FFmpeg understands various forms of these).
49 for (size_t i = 0; i < filename.size() - 1; ++i) {
50 if (filename[i] == ':' && filename[i + 1] == '/') {
53 if (!isalpha(filename[i])) {
58 // Look for the file in all theme_dirs until we find one;
59 // that will be the permanent resolution of this file, whether
60 // it is actually valid or not.
61 // We store errors from all the attempts, and show them
62 // once we know we can't find any of them.
63 vector<string> errors;
64 for (const string &dir : global_flags.theme_dirs) {
65 string pathname = dir + "/" + filename;
66 if (access(pathname.c_str(), O_RDONLY) == 0) {
70 snprintf(buf, sizeof(buf), "%s: %s", pathname.c_str(), strerror(errno));
71 errors.push_back(buf);
75 for (const string &error : errors) {
76 fprintf(stderr, "%s\n", error.c_str());
81 string search_for_file_or_die(const string &filename)
83 string pathname = search_for_file(filename);
84 if (pathname.empty()) {
85 fprintf(stderr, "Couldn't find %s in any directory in --theme-dirs, exiting.\n",
92 ImageInput::ImageInput(const string &filename)
93 : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
94 GL_UNSIGNED_BYTE, 1280, 720), // Resolution will be overwritten.
96 pathname(search_for_file_or_die(filename)),
97 current_image(load_image(filename, pathname))
99 if (current_image == nullptr) { // Could happen even though search_for_file() returned.
100 fprintf(stderr, "Couldn't load image, exiting.\n");
103 set_width(current_image->width);
104 set_height(current_image->height);
105 set_pixel_data(current_image->pixels.get());
108 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
110 // See if the background thread has given us a new version of our image.
111 // Note: The old version might still be lying around in other ImageInputs
112 // (in fact, it's likely), but at least the total amount of memory used
113 // is bounded. Currently we don't even share textures between them,
114 // so there's a fair amount of OpenGL memory waste anyway (the cache
115 // is mostly there to save startup time, not RAM).
117 unique_lock<mutex> lock(all_images_lock);
118 if (all_images[pathname] != current_image) {
119 current_image = all_images[pathname];
120 set_pixel_data(current_image->pixels.get());
123 movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
126 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &filename, const string &pathname)
128 unique_lock<mutex> lock(all_images_lock); // Held also during loading.
129 if (all_images.count(pathname)) {
130 return all_images[pathname];
133 all_images[pathname] = load_image_raw(pathname);
134 timespec first_modified = all_images[pathname]->last_modified;
135 update_threads[pathname] =
136 thread(bind(update_thread_func, filename, pathname, first_modified));
138 return all_images[pathname];
141 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
143 // Note: Call before open, not after; otherwise, there's a race.
144 // (There is now, too, but it tips the correct way. We could use fstat()
145 // if we had the file descriptor.)
147 if (stat(pathname.c_str(), &buf) != 0) {
148 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
151 timespec last_modified = buf.st_mtim;
153 auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
154 if (format_ctx == nullptr) {
155 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
159 if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
160 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
164 int stream_index = -1;
165 for (unsigned i = 0; i < format_ctx->nb_streams; ++i) {
166 if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
171 if (stream_index == -1) {
172 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
176 const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
177 AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
178 if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
179 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
182 AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
183 if (codec == nullptr) {
184 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
187 if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
188 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
191 unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
192 codec_ctx.get(), avcodec_close);
194 // Read packets until we have a frame or there are none left.
195 int frame_finished = 0;
196 AVFrameWithDeleter frame = av_frame_alloc_unique();
200 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
201 &pkt, av_packet_unref);
202 av_init_packet(&pkt);
205 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
206 if (pkt.stream_index != stream_index) {
209 if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
210 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
214 eof = true; // Or error, but ignore that for the time being.
217 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
219 frame_finished = true;
221 } else if (err != AVERROR(EAGAIN)) {
222 fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
227 if (!frame_finished) {
228 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
232 uint8_t *pic_data[4] = {nullptr};
233 unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
234 &pic_data[0], av_freep);
236 if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
237 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
240 unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
241 sws_getContext(frame->width, frame->height,
242 (AVPixelFormat)frame->format, frame->width, frame->height,
243 AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
245 if (sws_ctx == nullptr) {
246 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
249 sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
251 size_t len = frame->width * frame->height * 4;
252 unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
253 av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
255 shared_ptr<Image> image(new Image{unsigned(frame->width), unsigned(frame->height), move(image_data), last_modified});
259 // Fire up a thread to update the image every second.
260 // We could do inotify, but this is good enough for now.
261 void ImageInput::update_thread_func(const std::string &filename, const std::string &pathname, const timespec &first_modified)
263 char thread_name[16];
264 snprintf(thread_name, sizeof(thread_name), "Update_%s", filename.c_str());
265 pthread_setname_np(pthread_self(), thread_name);
267 timespec last_modified = first_modified;
271 unique_lock<mutex> lock(threads_should_quit_mu);
272 threads_should_quit_modified.wait_for(lock, chrono::seconds(1), []() { return threads_should_quit; });
275 if (threads_should_quit) {
279 if (stat(pathname.c_str(), &buf) != 0) {
280 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
283 if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
284 buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
288 shared_ptr<const Image> image = load_image_raw(pathname);
289 if (image == nullptr) {
290 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
293 fprintf(stderr, "Loaded new version of %s from disk.\n", pathname.c_str());
294 unique_lock<mutex> lock(all_images_lock);
295 all_images[pathname] = image;
296 last_modified = image->last_modified;
300 void ImageInput::shutdown_updaters()
303 unique_lock<mutex> lock(threads_should_quit_mu);
304 threads_should_quit = true;
305 threads_should_quit_modified.notify_all();
307 for (auto &it : update_threads) {
312 mutex ImageInput::all_images_lock;
313 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
314 map<string, thread> ImageInput::update_threads;
315 mutex ImageInput::threads_should_quit_mu;
316 bool ImageInput::threads_should_quit = false;
317 condition_variable ImageInput::threads_should_quit_modified;