Add .editorconfig, .gitignore and FFmpeg deprecation note

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style             = tab
+indent_size              = 4
+charset                  = utf-8
+end_of_line              = lf
+trim_trailing_whitespace = true
+insert_final_newline     = true

.gitignore

@@ -0,0 +1,6 @@
+desktop.ini
+.DS_Store
+.vscode/
+build/
+.cache/
+*.code-workspace

meson.build

@@ -9,24 +9,24 @@ configure_file(output: 'config.h', configuration: conf_data)
 libm_dep = meson.get_compiler('c').find_library('m')
 
 ffmpeg = [
-  dependency('libavformat'),
+	dependency('libavformat'),
-  dependency('libavcodec'),
+	dependency('libavcodec'),
-  dependency('libavutil'),
+	dependency('libavutil'),
-  dependency('libswresample'),
+	dependency('libswresample'),
-  dependency('libswscale')
+	dependency('libswscale')
 ]
 
 libpsxav = static_library('psxav', [
-  'libpsxav/adpcm.c',
+	'libpsxav/adpcm.c',
-  'libpsxav/cdrom.c',
+	'libpsxav/cdrom.c',
-  'libpsxav/libpsxav.h'
+	'libpsxav/libpsxav.h'
 ])
 libpsxav_dep = declare_dependency(include_directories: include_directories('libpsxav'), link_with: libpsxav)
 
 executable('psxavenc', [
-  'psxavenc/cdrom.c',
+	'psxavenc/cdrom.c',
-  'psxavenc/decoding.c',
+	'psxavenc/decoding.c',
-  'psxavenc/filefmt.c',
+	'psxavenc/filefmt.c',
-  'psxavenc/mdec.c',
+	'psxavenc/mdec.c',
-  'psxavenc/psxavenc.c'
+	'psxavenc/psxavenc.c'
 ], dependencies: [libm_dep, ffmpeg, libpsxav_dep], install: true)

psxavenc/decoding.c

@@ -399,6 +399,7 @@ void close_av_data(settings_t *settings)
 
 	av_frame_free(&(av->frame));
 	swr_free(&(av->resampler));
+	// Deprecated, kept for compatibility with older FFmpeg versions.
 	avcodec_close(av->audio_codec_context);
 	avcodec_free_context(&(av->audio_codec_context));
 	avformat_free_context(av->format);