Preserve log level

Author: WyattBlue

av/filter/__init__.py

@@ -1,2 +1,3 @@
 from .filter import Filter, FilterFlags, filter_descriptor, filters_available
 from .graph import Graph
+from .loudnorm import stats

av/filter/__init__.pyi

@@ -1,3 +1,4 @@
 from .context import *
 from .filter import *
 from .graph import *
+from .loudnorm import *

av/filter/loudnorm.pyx

@@ -8,6 +8,7 @@ from av.audio.codeccontext cimport AudioCodecContext
 from av.audio.stream cimport AudioStream
 from av.container.core cimport Container
 from av.stream cimport Stream
+from av.logging import get_level, set_level
 
 
 cdef extern from "libavcodec/avcodec.h":
@@ -51,6 +52,9 @@ cpdef bytes stats(str loudnorm_args, AudioStream stream):
     cdef const char* c_args = py_args
     cdef char* result
 
+    # Save log level since C function overwrite it.
+    level = get_level()
+
     with nogil:
         result = loudnorm_get_stats(format_ptr, stream_index, c_args)
 
@@ -60,4 +64,6 @@ cpdef bytes stats(str loudnorm_args, AudioStream stream):
     py_result = result[:]  # Make a copy of the string
     free(result)  # Free the C string
 
+    set_level(level)
+
     return py_result

av/filter/loudnorm_impl.c

@@ -3,7 +3,6 @@
 #include <libavfilter/avfilter.h>
 #include <libavfilter/buffersink.h>
 #include <libavfilter/buffersrc.h>
-#include <libavutil/opt.h>
 #include <string.h>
 
 #ifdef _WIN32
@@ -154,22 +153,11 @@ char* loudnorm_get_stats(
         av_frame_unref(filt_frame);
     }
 
-    // Force stats print
-    if (loudnorm_ctx) {
-        av_log_set_level(AV_LOG_INFO);
-        av_opt_set(loudnorm_ctx, "print_format", "json", AV_OPT_SEARCH_CHILDREN);
-        av_opt_set(loudnorm_ctx, "measured_i", NULL, AV_OPT_SEARCH_CHILDREN);
-        av_opt_set(loudnorm_ctx, "measured_lra", NULL, AV_OPT_SEARCH_CHILDREN);
-        av_opt_set(loudnorm_ctx, "measured_tp", NULL, AV_OPT_SEARCH_CHILDREN);
-        av_opt_set(loudnorm_ctx, "measured_thresh", NULL, AV_OPT_SEARCH_CHILDREN);
-        avfilter_init_str(loudnorm_ctx, NULL);
-    }
-
-    avfilter_graph_request_oldest(filter_graph);
+    // Pushes graph
+    avfilter_graph_free(&filter_graph);
 
 end:
     avcodec_free_context(&codec_ctx);
-    avfilter_graph_free(&filter_graph);
     avformat_close_input(&fmt_ctx);
     av_frame_free(&filt_frame);
     av_frame_free(&frame);