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"
42 string search_for_file(const string &filename)
44 // Look for the file in all theme_dirs until we find one;
45 // that will be the permanent resolution of this file, whether
46 // it is actually valid or not.
47 // We store errors from all the attempts, and show them
48 // once we know we can't find any of them.
49 vector<string> errors;
50 for (const string &dir : global_flags.theme_dirs) {
51 string pathname = dir + "/" + filename;
52 if (access(pathname.c_str(), O_RDONLY) == 0) {
56 snprintf(buf, sizeof(buf), "%s: %s", pathname.c_str(), strerror(errno));
57 errors.push_back(buf);
61 for (const string &error : errors) {
62 fprintf(stderr, "%s\n", error.c_str());
64 fprintf(stderr, "Couldn't find %s in any directory in --theme-dirs, exiting.\n",
71 ImageInput::ImageInput(const string &filename)
72 : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
73 GL_UNSIGNED_BYTE, 1280, 720), // FIXME
74 pathname(search_for_file(filename)),
75 current_image(load_image(pathname))
77 if (current_image == nullptr) { // Could happen even though search_for_file() returned.
78 fprintf(stderr, "Couldn't load image, exiting.\n");
81 set_pixel_data(current_image->pixels.get());
84 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
86 // See if the background thread has given us a new version of our image.
87 // Note: The old version might still be lying around in other ImageInputs
88 // (in fact, it's likely), but at least the total amount of memory used
89 // is bounded. Currently we don't even share textures between them,
90 // so there's a fair amount of OpenGL memory waste anyway (the cache
91 // is mostly there to save startup time, not RAM).
93 unique_lock<mutex> lock(all_images_lock);
94 if (all_images[pathname] != current_image) {
95 current_image = all_images[pathname];
96 set_pixel_data(current_image->pixels.get());
99 movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
102 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &pathname)
104 unique_lock<mutex> lock(all_images_lock); // Held also during loading.
105 if (all_images.count(pathname)) {
106 return all_images[pathname];
109 all_images[pathname] = load_image_raw(pathname);
110 timespec first_modified = all_images[pathname]->last_modified;
111 update_threads[pathname] =
112 thread(bind(update_thread_func, pathname, first_modified));
114 return all_images[pathname];
117 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
119 // Note: Call before open, not after; otherwise, there's a race.
120 // (There is now, too, but it tips the correct way. We could use fstat()
121 // if we had the file descriptor.)
123 if (stat(pathname.c_str(), &buf) != 0) {
124 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
127 timespec last_modified = buf.st_mtim;
129 auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
130 if (format_ctx == nullptr) {
131 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
135 if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
136 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
140 int stream_index = -1;
141 for (unsigned i = 0; i < format_ctx->nb_streams; ++i) {
142 if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
147 if (stream_index == -1) {
148 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
152 const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
153 AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
154 if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
155 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
158 AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
159 if (codec == nullptr) {
160 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
163 if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
164 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
167 unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
168 codec_ctx.get(), avcodec_close);
170 // Read packets until we have a frame or there are none left.
171 int frame_finished = 0;
172 AVFrameWithDeleter frame = av_frame_alloc_unique();
176 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
177 &pkt, av_packet_unref);
178 av_init_packet(&pkt);
181 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
182 if (pkt.stream_index != stream_index) {
185 if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
186 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
190 eof = true; // Or error, but ignore that for the time being.
193 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
195 frame_finished = true;
197 } else if (err != AVERROR(EAGAIN)) {
198 fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
203 if (!frame_finished) {
204 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
208 // TODO: Scale down if needed!
209 uint8_t *pic_data[4] = {nullptr};
210 unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
211 &pic_data[0], av_freep);
213 if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
214 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
217 unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
218 sws_getContext(frame->width, frame->height,
219 (AVPixelFormat)frame->format, frame->width, frame->height,
220 AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
222 if (sws_ctx == nullptr) {
223 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
226 sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
228 size_t len = frame->width * frame->height * 4;
229 unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
230 av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
232 shared_ptr<Image> image(new Image{move(image_data), last_modified});
236 // Fire up a thread to update the image every second.
237 // We could do inotify, but this is good enough for now.
238 void ImageInput::update_thread_func(const std::string &pathname, const timespec &first_modified)
240 timespec last_modified = first_modified;
245 if (threads_should_quit) {
249 if (stat(pathname.c_str(), &buf) != 0) {
250 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
253 if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
254 buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
258 shared_ptr<const Image> image = load_image_raw(pathname);
259 if (image == nullptr) {
260 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
263 fprintf(stderr, "Loaded new version of %s from disk.\n", pathname.c_str());
264 unique_lock<mutex> lock(all_images_lock);
265 all_images[pathname] = image;
266 last_modified = image->last_modified;
270 void ImageInput::shutdown_updaters()
272 // TODO: Kick these out of the sleep before one second?
273 threads_should_quit = true;
275 for (auto &it : update_threads) {
280 mutex ImageInput::all_images_lock;
281 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
282 map<string, thread> ImageInput::update_threads;
283 volatile bool ImageInput::threads_should_quit = false;