feat(libplacebo): added more modes for Anime4K v4

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

src/libplacebo_filter.cpp

@@ -57,7 +57,8 @@ int LibplaceboFilter::init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVB
     in_time_base = dec_ctx->time_base;
     out_time_base = enc_ctx->time_base;
 
-    return init_libplacebo(
+    // Initialize the libplacebo filter
+    int ret = init_libplacebo(
         hw_ctx,
         &filter_graph,
         &buffersrc_ctx,
@@ -67,6 +68,14 @@ int LibplaceboFilter::init(AVCodecContext *dec_ctx, AVCodecContext *enc_ctx, AVB
         out_height,
         shader_full_path
     );
+
+    // Set these resources to nullptr since they are already freed by `avfilter_graph_free`
+    if (ret < 0) {
+        buffersrc_ctx = nullptr;
+        buffersink_ctx = nullptr;
+        filter_graph = nullptr;
+    }
+    return ret;
 }
 
 int LibplaceboFilter::process_frame(AVFrame *in_frame, AVFrame **out_frame) {

src/libvideo2x.cpp

@@ -218,27 +218,35 @@ static void cleanup(
 ) {
     if (ifmt_ctx) {
         avformat_close_input(&ifmt_ctx);
+        ifmt_ctx = nullptr;
     }
     if (ofmt_ctx && !(ofmt_ctx->oformat->flags & AVFMT_NOFILE)) {
         avio_closep(&ofmt_ctx->pb);
+        ofmt_ctx->pb = nullptr;
     }
     if (ofmt_ctx) {
         avformat_free_context(ofmt_ctx);
+        ofmt_ctx = nullptr;
     }
     if (dec_ctx) {
         avcodec_free_context(&dec_ctx);
+        dec_ctx = nullptr;
     }
     if (enc_ctx) {
         avcodec_free_context(&enc_ctx);
+        enc_ctx = nullptr;
     }
     if (hw_ctx) {
         av_buffer_unref(&hw_ctx);
+        hw_ctx = nullptr;
     }
     if (stream_map) {
         av_free(stream_map);
+        stream_map = nullptr;
     }
     if (filter) {
         delete filter;
+        filter = nullptr;
     }
 }
 
@@ -435,8 +443,7 @@ extern "C" int process_video(
     // Initialize the filter
     ret = filter->init(dec_ctx, enc_ctx, hw_ctx);
     if (ret < 0) {
-        av_strerror(ret, errbuf, sizeof(errbuf));
-        spdlog::error("Failed to initialize filter: {}", errbuf);
+        spdlog::error("Failed to initialize filter");
         cleanup(ifmt_ctx, ofmt_ctx, dec_ctx, enc_ctx, hw_ctx, stream_map, filter);
         return ret;
     }

src/video2x.c

@@ -169,7 +169,7 @@ void print_help(void) {
     printf("  -q, --crf		Constant Rate Factor (default: 20.0)\n");
 
     printf("\nlibplacebo Options:\n");
-    printf("  -s, --shader		Name or path to custom GLSL shader file\n");
+    printf("  -s, --shader		Name of or path to GLSL shader file\n");
     printf("  -w, --width		Output width\n");
     printf("  -h, --height		Output height\n");