1 #include "image_input.h"
4 #include <movit/flat_input.h>
5 #include <movit/image_format.h>
12 #include <libavcodec/avcodec.h>
13 #include <libavformat/avformat.h>
14 #include <libavutil/avutil.h>
15 #include <libavutil/error.h>
16 #include <libavutil/frame.h>
17 #include <libavutil/imgutils.h>
18 #include <libavutil/mem.h>
19 #include <libavutil/pixfmt.h>
20 #include <libswscale/swscale.h>
33 #include "ffmpeg_raii.h"
34 #include "ffmpeg_util.h"
41 ImageInput::ImageInput(const string &filename)
42 : movit::FlatInput({movit::COLORSPACE_sRGB, movit::GAMMA_sRGB}, movit::FORMAT_RGBA_POSTMULTIPLIED_ALPHA,
43 GL_UNSIGNED_BYTE, 1280, 720), // Resolution will be overwritten.
45 pathname(search_for_file_or_die(filename)),
46 current_image(load_image(filename, pathname))
48 if (current_image == nullptr) { // Could happen even though search_for_file() returned.
49 fprintf(stderr, "Couldn't load image, exiting.\n");
52 set_width(current_image->width);
53 set_height(current_image->height);
54 set_pixel_data(current_image->pixels.get());
57 void ImageInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
59 // See if the background thread has given us a new version of our image.
60 // Note: The old version might still be lying around in other ImageInputs
61 // (in fact, it's likely), but at least the total amount of memory used
62 // is bounded. Currently we don't even share textures between them,
63 // so there's a fair amount of OpenGL memory waste anyway (the cache
64 // is mostly there to save startup time, not RAM).
66 unique_lock<mutex> lock(all_images_lock);
67 if (all_images[pathname] != current_image) {
68 current_image = all_images[pathname];
69 set_pixel_data(current_image->pixels.get());
72 movit::FlatInput::set_gl_state(glsl_program_num, prefix, sampler_num);
75 shared_ptr<const ImageInput::Image> ImageInput::load_image(const string &filename, const string &pathname)
77 unique_lock<mutex> lock(all_images_lock); // Held also during loading.
78 if (all_images.count(pathname)) {
79 return all_images[pathname];
82 all_images[pathname] = load_image_raw(pathname);
83 timespec first_modified = all_images[pathname]->last_modified;
84 update_threads[pathname] =
85 thread(bind(update_thread_func, filename, pathname, first_modified));
87 return all_images[pathname];
90 shared_ptr<const ImageInput::Image> ImageInput::load_image_raw(const string &pathname)
92 // Note: Call before open, not after; otherwise, there's a race.
93 // (There is now, too, but it tips the correct way. We could use fstat()
94 // if we had the file descriptor.)
96 if (stat(pathname.c_str(), &buf) != 0) {
97 fprintf(stderr, "%s: Error stat-ing file\n", pathname.c_str());
100 timespec last_modified = buf.st_mtim;
102 auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
103 if (format_ctx == nullptr) {
104 fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
108 if (avformat_find_stream_info(format_ctx.get(), nullptr) < 0) {
109 fprintf(stderr, "%s: Error finding stream info\n", pathname.c_str());
113 int stream_index = find_stream_index(format_ctx.get(), AVMEDIA_TYPE_VIDEO);
114 if (stream_index == -1) {
115 fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
119 const AVCodecParameters *codecpar = format_ctx->streams[stream_index]->codecpar;
120 AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
121 if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
122 fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
125 AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
126 if (codec == nullptr) {
127 fprintf(stderr, "%s: Cannot find decoder\n", pathname.c_str());
130 if (avcodec_open2(codec_ctx.get(), codec, nullptr) < 0) {
131 fprintf(stderr, "%s: Cannot open decoder\n", pathname.c_str());
134 unique_ptr<AVCodecContext, decltype(avcodec_close)*> codec_ctx_cleanup(
135 codec_ctx.get(), avcodec_close);
137 // Read packets until we have a frame or there are none left.
138 int frame_finished = 0;
139 AVFrameWithDeleter frame = av_frame_alloc_unique();
143 unique_ptr<AVPacket, decltype(av_packet_unref)*> pkt_cleanup(
144 &pkt, av_packet_unref);
145 av_init_packet(&pkt);
148 if (av_read_frame(format_ctx.get(), &pkt) == 0) {
149 if (pkt.stream_index != stream_index) {
152 if (avcodec_send_packet(codec_ctx.get(), &pkt) < 0) {
153 fprintf(stderr, "%s: Cannot send packet to codec.\n", pathname.c_str());
157 eof = true; // Or error, but ignore that for the time being.
160 int err = avcodec_receive_frame(codec_ctx.get(), frame.get());
162 frame_finished = true;
164 } else if (err != AVERROR(EAGAIN)) {
165 fprintf(stderr, "%s: Cannot receive frame from codec.\n", pathname.c_str());
170 if (!frame_finished) {
171 fprintf(stderr, "%s: Decoder did not output frame.\n", pathname.c_str());
175 uint8_t *pic_data[4] = {nullptr};
176 unique_ptr<uint8_t *, decltype(av_freep)*> pic_data_cleanup(
177 &pic_data[0], av_freep);
179 if (av_image_alloc(pic_data, linesizes, frame->width, frame->height, AV_PIX_FMT_RGBA, 1) < 0) {
180 fprintf(stderr, "%s: Could not allocate picture data\n", pathname.c_str());
183 unique_ptr<SwsContext, decltype(sws_freeContext)*> sws_ctx(
184 sws_getContext(frame->width, frame->height,
185 (AVPixelFormat)frame->format, frame->width, frame->height,
186 AV_PIX_FMT_RGBA, SWS_BICUBIC, nullptr, nullptr, nullptr),
188 if (sws_ctx == nullptr) {
189 fprintf(stderr, "%s: Could not create scaler context\n", pathname.c_str());
192 sws_scale(sws_ctx.get(), frame->data, frame->linesize, 0, frame->height, pic_data, linesizes);
194 size_t len = frame->width * frame->height * 4;
195 unique_ptr<uint8_t[]> image_data(new uint8_t[len]);
196 av_image_copy_to_buffer(image_data.get(), len, pic_data, linesizes, AV_PIX_FMT_RGBA, frame->width, frame->height, 1);
198 shared_ptr<Image> image(new Image{unsigned(frame->width), unsigned(frame->height), move(image_data), last_modified});
202 // Fire up a thread to update the image every second.
203 // We could do inotify, but this is good enough for now.
204 void ImageInput::update_thread_func(const std::string &filename, const std::string &pathname, const timespec &first_modified)
206 char thread_name[16];
207 snprintf(thread_name, sizeof(thread_name), "Update_%s", filename.c_str());
208 pthread_setname_np(pthread_self(), thread_name);
210 timespec last_modified = first_modified;
214 unique_lock<mutex> lock(threads_should_quit_mu);
215 threads_should_quit_modified.wait_for(lock, chrono::seconds(1), []() { return threads_should_quit; });
218 if (threads_should_quit) {
222 if (stat(pathname.c_str(), &buf) != 0) {
223 fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
226 if (buf.st_mtim.tv_sec == last_modified.tv_sec &&
227 buf.st_mtim.tv_nsec == last_modified.tv_nsec) {
231 shared_ptr<const Image> image = load_image_raw(pathname);
232 if (image == nullptr) {
233 fprintf(stderr, "Couldn't load image, leaving the old in place.\n");
236 fprintf(stderr, "Loaded new version of %s from disk.\n", pathname.c_str());
237 unique_lock<mutex> lock(all_images_lock);
238 all_images[pathname] = image;
239 last_modified = image->last_modified;
243 void ImageInput::shutdown_updaters()
246 unique_lock<mutex> lock(threads_should_quit_mu);
247 threads_should_quit = true;
248 threads_should_quit_modified.notify_all();
250 for (auto &it : update_threads) {
255 mutex ImageInput::all_images_lock;
256 map<string, shared_ptr<const ImageInput::Image>> ImageInput::all_images;
257 map<string, thread> ImageInput::update_threads;
258 mutex ImageInput::threads_should_quit_mu;
259 bool ImageInput::threads_should_quit = false;
260 condition_variable ImageInput::threads_should_quit_modified;