printing all frames

CMakeLists.txt

@@ -2,10 +2,21 @@ cmake_minimum_required(VERSION 3.15)
 
 project(ThumbnailGenerator)
 
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(LIBAV REQUIRED IMPORTED_TARGET
+   libavdevice
+   libavfilter
+   libavformat
+   libavcodec
+   libswresample
+   libswscale
+   libavutil
+)
+
 # compile_commands.json
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
-set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD 17)
 
 set (source_dir "./src")
 file (GLOB source_files "${source_dir}/*.cpp")
@@ -14,3 +25,5 @@ add_executable(ThumbnailGenerator ${source_files})
 
 file (GLOB header_files "${source_dir}/*.hpp")
 target_include_directories(ThumbnailGenerator PUBLIC ${source_dir})
+
+target_link_libraries(ThumbnailGenerator PkgConfig::LIBAV)

build/CMakeCache.txt

@@ -209,6 +209,12 @@ CMAKE_STRIP:FILEPATH=/usr/bin/strip
 // Studio IDE projects all commands are done without /nologo.
 CMAKE_VERBOSE_MAKEFILE:BOOL=FALSE
 
+//Arguments to supply to pkg-config
+PKG_CONFIG_ARGN:STRING=
+
+//pkg-config executable
+PKG_CONFIG_EXECUTABLE:FILEPATH=/usr/bin/pkg-config
+
 //Value Computed by CMake
 ThumbnailGenerator_BINARY_DIR:STATIC=/home/talksik/code/cpp_thumbnail_generator/build
 
@@ -218,6 +224,27 @@ ThumbnailGenerator_IS_TOP_LEVEL:STATIC=ON
 //Value Computed by CMake
 ThumbnailGenerator_SOURCE_DIR:STATIC=/home/talksik/code/cpp_thumbnail_generator
 
+//Path to a library.
+pkgcfg_lib_LIBAV_avcodec:FILEPATH=/usr/lib/x86_64-linux-gnu/libavcodec.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_avdevice:FILEPATH=/usr/lib/x86_64-linux-gnu/libavdevice.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_avfilter:FILEPATH=/usr/lib/x86_64-linux-gnu/libavfilter.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_avformat:FILEPATH=/usr/lib/x86_64-linux-gnu/libavformat.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_avutil:FILEPATH=/usr/lib/x86_64-linux-gnu/libavutil.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_swresample:FILEPATH=/usr/lib/x86_64-linux-gnu/libswresample.so
+
+//Path to a library.
+pkgcfg_lib_LIBAV_swscale:FILEPATH=/usr/lib/x86_64-linux-gnu/libswscale.so
+
 
 ########################
 # INTERNAL cache entries
@@ -366,4 +393,93 @@ CMAKE_STRIP-ADVANCED:INTERNAL=1
 CMAKE_UNAME:INTERNAL=/usr/bin/uname
 //ADVANCED property for variable: CMAKE_VERBOSE_MAKEFILE
 CMAKE_VERBOSE_MAKEFILE-ADVANCED:INTERNAL=1
+//Details about finding PkgConfig
+FIND_PACKAGE_MESSAGE_DETAILS_PkgConfig:INTERNAL=[/usr/bin/pkg-config][v0.29.2()]
+LIBAV_CFLAGS:INTERNAL=-I/usr/include/x86_64-linux-gnu
+LIBAV_CFLAGS_I:INTERNAL=
+LIBAV_CFLAGS_OTHER:INTERNAL=
+LIBAV_FOUND:INTERNAL=1
+LIBAV_INCLUDEDIR:INTERNAL=
+LIBAV_INCLUDE_DIRS:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_LDFLAGS:INTERNAL=-L/usr/lib/x86_64-linux-gnu;-lavdevice;-lavfilter;-lavformat;-lavcodec;-lswresample;-lswscale;-lavutil
+LIBAV_LDFLAGS_OTHER:INTERNAL=
+LIBAV_LIBDIR:INTERNAL=
+LIBAV_LIBRARIES:INTERNAL=avdevice;avfilter;avformat;avcodec;swresample;swscale;avutil
+LIBAV_LIBRARY_DIRS:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_LIBS:INTERNAL=
+LIBAV_LIBS_L:INTERNAL=
+LIBAV_LIBS_OTHER:INTERNAL=
+LIBAV_LIBS_PATHS:INTERNAL=
+LIBAV_MODULE_NAME:INTERNAL=
+LIBAV_PREFIX:INTERNAL=
+LIBAV_STATIC_CFLAGS:INTERNAL=-I/usr/include/x86_64-linux-gnu
+LIBAV_STATIC_CFLAGS_I:INTERNAL=
+LIBAV_STATIC_CFLAGS_OTHER:INTERNAL=
+LIBAV_STATIC_INCLUDE_DIRS:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_STATIC_LDFLAGS:INTERNAL=-L/usr/lib/x86_64-linux-gnu;-lavdevice;-lm;-lraw1394;-lavc1394;-lrom1394;-liec61883;-ljack;-ldrm;-lopenal;-lxcb;-lxcb-shm;-lxcb-shape;-lxcb-xfixes;-lcdio_paranoia;-lcdio_cdda;-lcdio;-lm;-ldc1394;-lasound;-lcaca;-lGL;-lpulse;-pthread;-lSDL2;-lsndio;-lXv;-lX11;-lXext;-lavfilter;-pthread;-lm;-lpocketsphinx;-lsphinxbase;-lsphinxad;-lbs2b;-llilv-0;-ldl;-lsratom-0;-lsord-0;-lserd-0;-lrubberband;-lsamplerate;-lstdc++;-lmysofa;-lflite_cmu_time_awb;-lflite_cmu_us_awb;-lflite_cmu_us_kal;-lflite_cmu_us_kal16;-lflite_cmu_us_rms;-lflite_cmu_us_slt;-lflite_usenglish;-lflite_cmulex;-lflite;-lfribidi;-lass;-lva;-lvidstab;-lm;-lgomp;-lzmq;-lzimg;-lOpenCL;-lfontconfig;-lfreetype;-lmfx;-lstdc++;-ldl;-lpostproc;-lm;-lavformat;-lm;-lxml2;-lbz2;-lgme;-lopenmpt;-lstdc++;-lchromaprint;-lbluray;-lz;-lgnutls;-lrabbitmq;-lsrt-gnutls;-lssh;-lzmq;-lavcodec;-lvpx;-lm;-lvpx;-lm;-lvpx;-lm;-lvpx;-lm;-lwebpmux;-lwebp;-lm;-llzma;-ldav1d;-lrsvg-2;-lm;-lgio-2.0;-lgdk_pixbuf-2.0;-lgobject-2.0;-lglib-2.0;-lcairo;-lzvbi;-lm;-lpthread;-lm;-lpng;-lz;-lsnappy;-lstdc++;-lz;-laom;-lcodec2;-lgsm;-lmp3lame;-lm;-lopenjp2;-lopus;-lm;-lshine;-lspeex;-ltheoraenc;-ltheoradec;-logg;-ltwolame;-lvorbis;-lvorbisenc;-lwebp;-lx264;-lx265;-lxvidcore;-pthread;-lva;-lmfx;-lstdc++;-ldl;-lswresample;-lm;-lsoxr;-lswscale;-lm;-lavutil;-pthread;-lva-drm;-lva;-lva-x11;-lva;-lvdpau;-lX11;-lm;-ldrm;-lmfx;-lstdc++;-ldl;-lOpenCL;-lva;-lXv;-lX11;-lXext
+LIBAV_STATIC_LDFLAGS_OTHER:INTERNAL=-pthread
+LIBAV_STATIC_LIBDIR:INTERNAL=
+LIBAV_STATIC_LIBRARIES:INTERNAL=avdevice;m;raw1394;avc1394;rom1394;iec61883;jack;drm;openal;xcb;xcb-shm;xcb-shape;xcb-xfixes;cdio_paranoia;cdio_cdda;cdio;m;dc1394;asound;caca;GL;pulse;SDL2;sndio;Xv;X11;Xext;avfilter;m;pocketsphinx;sphinxbase;sphinxad;bs2b;lilv-0;dl;sratom-0;sord-0;serd-0;rubberband;samplerate;stdc++;mysofa;flite_cmu_time_awb;flite_cmu_us_awb;flite_cmu_us_kal;flite_cmu_us_kal16;flite_cmu_us_rms;flite_cmu_us_slt;flite_usenglish;flite_cmulex;flite;fribidi;ass;va;vidstab;m;gomp;zmq;zimg;OpenCL;fontconfig;freetype;mfx;stdc++;dl;postproc;m;avformat;m;xml2;bz2;gme;openmpt;stdc++;chromaprint;bluray;z;gnutls;rabbitmq;srt-gnutls;ssh;zmq;avcodec;vpx;m;vpx;m;vpx;m;vpx;m;webpmux;webp;m;lzma;dav1d;rsvg-2;m;gio-2.0;gdk_pixbuf-2.0;gobject-2.0;glib-2.0;cairo;zvbi;m;pthread;m;png;z;snappy;stdc++;z;aom;codec2;gsm;mp3lame;m;openjp2;opus;m;shine;speex;theoraenc;theoradec;ogg;twolame;vorbis;vorbisenc;webp;x264;x265;xvidcore;va;mfx;stdc++;dl;swresample;m;soxr;swscale;m;avutil;va-drm;va;va-x11;va;vdpau;X11;m;drm;mfx;stdc++;dl;OpenCL;va;Xv;X11;Xext
+LIBAV_STATIC_LIBRARY_DIRS:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_STATIC_LIBS:INTERNAL=
+LIBAV_STATIC_LIBS_L:INTERNAL=
+LIBAV_STATIC_LIBS_OTHER:INTERNAL=
+LIBAV_STATIC_LIBS_PATHS:INTERNAL=
+LIBAV_VERSION:INTERNAL=
+LIBAV_libavcodec_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libavcodec_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libavcodec_MODULE_NAME:INTERNAL=libavcodec
+LIBAV_libavcodec_PREFIX:INTERNAL=/usr
+LIBAV_libavcodec_VERSION:INTERNAL=58.134.100
+LIBAV_libavdevice_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libavdevice_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libavdevice_MODULE_NAME:INTERNAL=libavdevice
+LIBAV_libavdevice_PREFIX:INTERNAL=/usr
+LIBAV_libavdevice_VERSION:INTERNAL=58.13.100
+LIBAV_libavfilter_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libavfilter_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libavfilter_MODULE_NAME:INTERNAL=libavfilter
+LIBAV_libavfilter_PREFIX:INTERNAL=/usr
+LIBAV_libavfilter_VERSION:INTERNAL=7.110.100
+LIBAV_libavformat_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libavformat_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libavformat_MODULE_NAME:INTERNAL=libavformat
+LIBAV_libavformat_PREFIX:INTERNAL=/usr
+LIBAV_libavformat_VERSION:INTERNAL=58.76.100
+LIBAV_libavutil_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libavutil_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libavutil_MODULE_NAME:INTERNAL=libavutil
+LIBAV_libavutil_PREFIX:INTERNAL=/usr
+LIBAV_libavutil_VERSION:INTERNAL=56.70.100
+LIBAV_libswresample_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libswresample_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libswresample_MODULE_NAME:INTERNAL=libswresample
+LIBAV_libswresample_PREFIX:INTERNAL=/usr
+LIBAV_libswresample_VERSION:INTERNAL=3.9.100
+LIBAV_libswscale_INCLUDEDIR:INTERNAL=/usr/include/x86_64-linux-gnu
+LIBAV_libswscale_LIBDIR:INTERNAL=/usr/lib/x86_64-linux-gnu
+LIBAV_libswscale_MODULE_NAME:INTERNAL=libswscale
+LIBAV_libswscale_PREFIX:INTERNAL=/usr
+LIBAV_libswscale_VERSION:INTERNAL=5.9.100
+//ADVANCED property for variable: PKG_CONFIG_ARGN
+PKG_CONFIG_ARGN-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: PKG_CONFIG_EXECUTABLE
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+__pkg_config_arguments_LIBAV:INTERNAL=REQUIRED;IMPORTED_TARGET;libavdevice;libavfilter;libavformat;libavcodec;libswresample;libswscale;libavutil
+__pkg_config_checked_LIBAV:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_avcodec
+pkgcfg_lib_LIBAV_avcodec-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_avdevice
+pkgcfg_lib_LIBAV_avdevice-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_avfilter
+pkgcfg_lib_LIBAV_avfilter-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_avformat
+pkgcfg_lib_LIBAV_avformat-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_avutil
+pkgcfg_lib_LIBAV_avutil-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_swresample
+pkgcfg_lib_LIBAV_swresample-ADVANCED:INTERNAL=1
+//ADVANCED property for variable: pkgcfg_lib_LIBAV_swscale
+pkgcfg_lib_LIBAV_swscale-ADVANCED:INTERNAL=1
+prefix_result:INTERNAL=/usr/lib/x86_64-linux-gnu
 

build/CMakeFiles/CMakeOutput.log

@@ -28,10 +28,10 @@ The CXX compiler identification is GNU, found in "/home/talksik/code/cpp_thumbna
 Detecting C compiler ABI info compiled with the following output:
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+Run Build Command(s):/usr/bin/gmake -f Makefile cmTC_c9464/fast && /usr/bin/gmake  -f CMakeFiles/cmTC_c9464.dir/build.make CMakeFiles/cmTC_c9464.dir/build
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+Building C object CMakeFiles/cmTC_c9464.dir/CMakeCCompilerABI.c.o
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   "CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o"
   "CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o.d"
+  "CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o"
+  "CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o.d"
   "ThumbnailGenerator"
   "ThumbnailGenerator.pdb"
 )

build/CMakeFiles/ThumbnailGenerator.dir/flags.make

@@ -6,5 +6,5 @@ CXX_DEFINES =
 
 CXX_INCLUDES = -I/home/talksik/code/cpp_thumbnail_generator/./src
 
-CXX_FLAGS = -g -std=gnu++14
+CXX_FLAGS = -g
 

build/CMakeFiles/ThumbnailGenerator.dir/link.txt

@@ -1 +1 @@
-/usr/bin/c++ -g CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o -o ThumbnailGenerator 
+/usr/bin/c++ -g CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o -o ThumbnailGenerator  /usr/lib/x86_64-linux-gnu/libavdevice.so /usr/lib/x86_64-linux-gnu/libavfilter.so /usr/lib/x86_64-linux-gnu/libavformat.so /usr/lib/x86_64-linux-gnu/libavcodec.so /usr/lib/x86_64-linux-gnu/libswresample.so /usr/lib/x86_64-linux-gnu/libswscale.so /usr/lib/x86_64-linux-gnu/libavutil.so 

build/CMakeFiles/ThumbnailGenerator.dir/progress.make

@@ -1,3 +1,4 @@
 CMAKE_PROGRESS_1 = 1
 CMAKE_PROGRESS_2 = 2
+CMAKE_PROGRESS_3 = 3
 

build/CMakeFiles/progress.marks

@@ -1 +1 @@
-2
+3

build/Makefile

@@ -153,6 +153,30 @@ src/Main.cpp.s:
 	$(MAKE) $(MAKESILENT) -f CMakeFiles/ThumbnailGenerator.dir/build.make CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.s
 .PHONY : src/Main.cpp.s
 
+src/ThumbnailGenerator.o: src/ThumbnailGenerator.cpp.o
+.PHONY : src/ThumbnailGenerator.o
+
+# target to build an object file
+src/ThumbnailGenerator.cpp.o:
+	$(MAKE) $(MAKESILENT) -f CMakeFiles/ThumbnailGenerator.dir/build.make CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o
+.PHONY : src/ThumbnailGenerator.cpp.o
+
+src/ThumbnailGenerator.i: src/ThumbnailGenerator.cpp.i
+.PHONY : src/ThumbnailGenerator.i
+
+# target to preprocess a source file
+src/ThumbnailGenerator.cpp.i:
+	$(MAKE) $(MAKESILENT) -f CMakeFiles/ThumbnailGenerator.dir/build.make CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.i
+.PHONY : src/ThumbnailGenerator.cpp.i
+
+src/ThumbnailGenerator.s: src/ThumbnailGenerator.cpp.s
+.PHONY : src/ThumbnailGenerator.s
+
+# target to generate assembly for a file
+src/ThumbnailGenerator.cpp.s:
+	$(MAKE) $(MAKESILENT) -f CMakeFiles/ThumbnailGenerator.dir/build.make CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.s
+.PHONY : src/ThumbnailGenerator.cpp.s
+
 # Help Target
 help:
 	@echo "The following are some of the valid targets for this Makefile:"
@@ -165,6 +189,9 @@ help:
 	@echo "... src/Main.o"
 	@echo "... src/Main.i"
 	@echo "... src/Main.s"
+	@echo "... src/ThumbnailGenerator.o"
+	@echo "... src/ThumbnailGenerator.i"
+	@echo "... src/ThumbnailGenerator.s"
 .PHONY : help
 
 

build/compile_commands.json

@@ -1,7 +1,12 @@
 [
 {
   "directory": "/home/talksik/code/cpp_thumbnail_generator/build",
-  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -std=gnu++14 -o CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/Main.cpp",
+  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -o CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/Main.cpp",
   "file": "/home/talksik/code/cpp_thumbnail_generator/src/Main.cpp"
+},
+{
+  "directory": "/home/talksik/code/cpp_thumbnail_generator/build",
+  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -o CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/ThumbnailGenerator.cpp",
+  "file": "/home/talksik/code/cpp_thumbnail_generator/src/ThumbnailGenerator.cpp"
 }
 ]

compile_commands.json

@@ -1,7 +1,12 @@
 [
 {
   "directory": "/home/talksik/code/cpp_thumbnail_generator/build",
-  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -std=gnu++14 -o CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/Main.cpp",
+  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -o CMakeFiles/ThumbnailGenerator.dir/src/Main.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/Main.cpp",
   "file": "/home/talksik/code/cpp_thumbnail_generator/src/Main.cpp"
+},
+{
+  "directory": "/home/talksik/code/cpp_thumbnail_generator/build",
+  "command": "/usr/bin/c++  -I/home/talksik/code/cpp_thumbnail_generator/./src -g -o CMakeFiles/ThumbnailGenerator.dir/src/ThumbnailGenerator.cpp.o -c /home/talksik/code/cpp_thumbnail_generator/src/ThumbnailGenerator.cpp",
+  "file": "/home/talksik/code/cpp_thumbnail_generator/src/ThumbnailGenerator.cpp"
 }
 ]

run.sh

@@ -1,4 +1,6 @@
-#!/bin/sh
+#!/bin/bash
+
+set -eo pipefail
 
 rm -rf build/
 mkdir -p build/
@@ -11,4 +13,8 @@ make
 
 cp ./compile_commands.json ../
 
-./ThumbnailGenerator
+cp ./ThumbnailGenerator ../
+
+cd ..
+
+./ThumbnailGenerator sample.mp4

src/Main.cpp

@@ -1,8 +1,31 @@
 
+#include "include/ThumbnailGenerator.hpp"
 #include <iostream>
+#include <libavutil/mem.h>
+#include <memory>
+
+#include <filesystem>
+#include <string>
 
 int main(int argc, char *argv[]) {
   std::cout << "Hello, World!" << std::endl;
 
+  if (argc < 2) {
+    std::cerr << "Usage: " << argv[0] << " <input_file>" << std::endl;
+    return 1;
+  }
+
+  std::string input_file = argv[1];
+  std::filesystem::path current_path = std::filesystem::current_path();
+  std::cout << "current path: " << current_path << std::endl;
+  std::cout << "input file: " << input_file << std::endl;
+  std::string input_file_path = current_path.string() + "/" + input_file;
+  std::cout << "input file path: " << input_file_path << std::endl;
+
+  std::unique_ptr<ThumbnailGenerator> thumbnailGenerator =
+      std::make_unique<ThumbnailGenerator>();
+
+  thumbnailGenerator->readVideoFrames(input_file_path);
+
   return 0;
 }

src/ThumbnailGenerator.cpp

@@ -0,0 +1,111 @@
+#include "include/ThumbnailGenerator.hpp"
+#include <iostream>
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavutil/avutil.h>
+#include <libavutil/error.h>
+#include <libavutil/imgutils.h>
+#include <libswscale/swscale.h>
+}
+
+ThumbnailGenerator::ThumbnailGenerator() { av_register_all(); }
+
+std::string ThumbnailGenerator::generateThumbnail(std::string path) {
+  std::cout << "generateThumbnail: " << path << std::endl;
+  return "generateThumbnail: " + path;
+}
+
+void ThumbnailGenerator::readVideoFrames(std::string input_file_path) {
+  std::cout << "readVideoFrames: " << input_file_path << std::endl;
+
+  // Open input file and allocate format context
+  AVFormatContext *format_ctx = nullptr;
+  int ret = avformat_open_input(&format_ctx, input_file_path.c_str(), nullptr,
+                                nullptr);
+  if (ret < 0) {
+    std::cerr << "Could not open input file: " << input_file_path << std::endl;
+    // char buff[256];
+    // av_strerror(ret, buff, 256);
+    // printf(buff);
+
+    std::cerr << "Error: " << ret << std::endl;
+    AVERROR(ret);
+
+    throw std::runtime_error("Could not open input file");
+  }
+
+  // Retrieve stream information
+  if (avformat_find_stream_info(format_ctx, nullptr) < 0) {
+    std::cerr << "Could not find stream information" << std::endl;
+    throw std::runtime_error("Could not find stream information");
+  }
+
+  // Find video stream
+  int video_stream_idx = -1;
+  for (unsigned int i = 0; i < format_ctx->nb_streams; ++i) {
+    if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
+      video_stream_idx = i;
+      break;
+    }
+  }
+
+  if (video_stream_idx == -1) {
+    std::cerr << "Could not find video stream" << std::endl;
+    throw std::runtime_error("Could not find video stream");
+  }
+
+  // Get codec parameters and codec context
+  AVCodecParameters *codecpar = format_ctx->streams[video_stream_idx]->codecpar;
+  AVCodec *codec = avcodec_find_decoder(codecpar->codec_id);
+  AVCodecContext *codec_ctx = avcodec_alloc_context3(codec);
+  avcodec_parameters_to_context(codec_ctx, codecpar);
+
+  // Open codec
+  if (avcodec_open2(codec_ctx, codec, nullptr) < 0) {
+    std::cerr << "Could not open codec" << std::endl;
+    throw std::runtime_error("Could not open codec");
+  }
+
+  // Allocate frame and packet
+  AVFrame *frame = av_frame_alloc();
+  AVPacket packet;
+  av_init_packet(&packet);
+
+  // Read frames from the video stream
+  while (av_read_frame(format_ctx, &packet) >= 0) {
+    if (packet.stream_index == video_stream_idx) {
+      // Decode video frame
+      int ret = avcodec_send_packet(codec_ctx, &packet);
+      if (ret < 0) {
+        std::cerr << "Error sending packet for decoding" << std::endl;
+        break;
+      }
+
+      while (ret >= 0) {
+        ret = avcodec_receive_frame(codec_ctx, frame);
+        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
+          break;
+        } else if (ret < 0) {
+          std::cerr << "Error during decoding" << std::endl;
+          break;
+        }
+
+        // Print basic frame properties
+        std::cout << "Frame "
+                  << codec_ctx->frame_number
+                  // << " (type=" << av_get_picture_type_char(frame->pict_type)
+                  << ", size=" << frame->pkt_size << " bytes) pts "
+                  << frame->pts << " key_frame " << frame->key_frame
+                  << std::endl;
+      }
+    }
+
+    av_packet_unref(&packet);
+  }
+
+  // Free allocated resources
+  av_frame_free(&frame);
+  avcodec_free_context(&codec_ctx);
+  avformat_close_input(&format_ctx);
+}

src/ThumbnailGenerator.hpp

@@ -1 +0,0 @@
-

src/include/ThumbnailGenerator.hpp

@@ -0,0 +1,13 @@
+
+#include <string>
+
+class ThumbnailGenerator {
+public:
+  ThumbnailGenerator();
+  // given a path to a video file, generate a thumbnail
+  std::string generateThumbnail(std::string path);
+
+  // reads and simply prints out information about the video frames
+  void readVideoFrames(std::string path);
+private:
+};