1 #include "image_input.h"
3 #include <movit/image_format.h>
6 #include <libavcodec/avcodec.h>
7 #include <libavformat/avformat.h>
8 #include <libavutil/imgutils.h>
9 #include <libavutil/pixfmt.h>
10 #include <libswscale/swscale.h>
13 #include <sys/types.h>
21 #include "ffmpeg_raii.h"
28 string search_for_file(const string &filename)
30 // Look for the file in all theme_dirs until we find one;
31 // that will be the permanent resolution of this file, whether
32 // it is actually valid or not.
33 // We store errors from all the attempts, and show them
34 // once we know we can't find any of them.
35 vector<string> errors;
36 for (const string &dir : global_flags.theme_dirs) {
37 string pathname = dir + "/" + filename;
38 if (access(pathname.c_str(), O_RDONLY) == 0) {
42 snprintf(buf, sizeof(buf), "%s: %s", pathname.c_str(), strerror(errno));
43 errors.push_back(buf);
47 for (const string &error : errors) {
48 fprintf(stderr, "%s\n", error.c_str());
50 fprintf(stderr, "Couldn't find %s in any directory in --theme-dirs, exiting.\n",
57 ImageInput::ImageInput(const string &filename)
58 : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
59 GL_UNSIGNED_BYTE, 1280, 720), // FIXME
60 pathname(search_for_file(filename)),
61 current_image(load_image(pathname))
63 if (current_image == nullptr) { // Could happen even though search_for_file() returned.
64 fprintf(stderr, "Couldn't load image, exiting.\n");
67 set_pixel_data(current_image->pixels.get());
70 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
72 // See if the background thread has given us a new version of our image.
73 // Note: The old version might still be lying around in other ImageInputs
74 // (in fact, it's likely), but at least the total amount of memory used
75 // is bounded. Currently we don't even share textures between them,
76 // so there's a fair amount of OpenGL memory waste anyway (the cache
77 // is mostly there to save startup time, not RAM).
79 unique_lock<mutex> lock(all_images_lock);
80 if (all_images[pathname] != current_image) {
81 current_image = all_images[pathname];
82 set_pixel_data(current_image->pixels.get());
85 movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
88 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &pathname)
90 unique_lock<mutex> lock(all_images_lock); // Held also during loading.
91 if (all_images.count(pathname)) {
92 return all_images[pathname];
95 all_images[pathname] = load_image_raw(pathname);
96 timespec first_modified = all_images[pathname]->last_modified;
97 update_threads[pathname] =
98 thread(bind(update_thread_func, pathname, first_modified));
100 return all_images[pathname];
103 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
105 // Note: Call before open, not after; otherwise, there's a race.
106 // (There is now, too, but it tips the correct way. We could use fstat()
107 // if we had the file descriptor.)
109 if (stat(pathname.c_str(), &buf) != 0) {
110 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
113 timespec last_modified = buf.st_mtim;
115 auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
116 if (format_ctx == nullptr) {
117 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
121 if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
122 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
126 int stream_index = -1;
127 for (unsigned i = 0; i < format_ctx->nb_streams; ++i) {
128 if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
133 if (stream_index == -1) {
134 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
138 const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
139 AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
140 if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
141 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
144 AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
145 if (codec == nullptr) {
146 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
149 if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
150 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
153 unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
154 codec_ctx.get(), avcodec_close);
156 // Read packets until we have a frame or there are none left.
157 int frame_finished = 0;
158 AVFrameWithDeleter frame = av_frame_alloc_unique();
162 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
163 &pkt, av_packet_unref);
164 av_init_packet(&pkt);
167 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
168 if (pkt.stream_index != stream_index) {
171 if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
172 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
176 eof = true; // Or error, but ignore that for the time being.
179 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
181 frame_finished = true;
183 } else if (err != AVERROR(EAGAIN)) {
184 fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
189 if (!frame_finished) {
190 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
194 // TODO: Scale down if needed!
195 uint8_t *pic_data[4] = {nullptr};
196 unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
197 &pic_data[0], av_freep);
199 if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
200 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
203 unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
204 sws_getContext(frame->width, frame->height,
205 (AVPixelFormat)frame->format, frame->width, frame->height,
206 AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
208 if (sws_ctx == nullptr) {
209 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
212 sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
214 size_t len = frame->width * frame->height * 4;
215 unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
216 av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
218 shared_ptr<Image> image(new Image{move(image_data), last_modified});
222 // Fire up a thread to update the image every second.
223 // We could do inotify, but this is good enough for now.
224 void ImageInput::update_thread_func(const std::string &pathname, const timespec &first_modified)
226 timespec last_modified = first_modified;
231 if (threads_should_quit) {
235 if (stat(pathname.c_str(), &buf) != 0) {
236 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
239 if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
240 buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
244 shared_ptr<const Image> image = load_image_raw(pathname);
245 if (image == nullptr) {
246 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
249 fprintf(stderr, "Loaded new version of %s from disk.\n", pathname.c_str());
250 unique_lock<mutex> lock(all_images_lock);
251 all_images[pathname] = image;
252 last_modified = image->last_modified;
256 void ImageInput::shutdown_updaters()
258 // TODO: Kick these out of the sleep before one second?
259 threads_should_quit = true;
261 for (auto &it : update_threads) {
266 mutex ImageInput::all_images_lock;
267 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
268 map<string, thread> ImageInput::update_threads;
269 volatile bool ImageInput::threads_should_quit = false;