refactor(libvideo2x): convert the video processor into a class (#1246)

Signed-off-by: k4yt3x <i@k4yt3x.com>

include/libvideo2x/encoder.h

@@ -3,13 +3,51 @@
 
 #include <cstdint>
 #include <filesystem>
+#include <vector>
 
 extern "C" {
+#include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
 #include <libavutil/pixdesc.h>
 }
 
-#include "libvideo2x/libvideo2x.h"
+#include "fsutils.h"
+
+// Encoder configurations
+struct EncoderConfig {
+    // Non-AVCodecContext options
+    AVCodecID codec;
+    bool copy_streams;
+
+    // Basic video options
+    int width;
+    int height;
+    int frm_rate_mul;
+    AVPixelFormat pix_fmt;
+
+    // Rate control and compression
+    int64_t bit_rate;
+    int rc_buffer_size;
+    int rc_min_rate;
+    int rc_max_rate;
+    int qmin;
+    int qmax;
+
+    // GOP and frame structure
+    int gop_size;
+    int max_b_frames;
+    int keyint_min;
+    int refs;
+
+    // Performance and threading
+    int thread_count;
+
+    // Latency and buffering
+    int delay;
+
+    // Extra AVOptions
+    std::vector<std::pair<StringType, StringType>> extra_opts;
+};
 
 class Encoder {
    public:
@@ -22,7 +60,6 @@ class Encoder {
         AVFormatContext *ifmt_ctx,
         AVCodecContext *dec_ctx,
         EncoderConfig &enc_cfg,
-        const ProcessorConfig &proc_cfg,
         int in_vstream_idx
     );