lavc: replace deprecated items

Some AVCodec properties like pix_fmts or sample_fmts are marked as
deprecated and should be replaced by avcodec_get_supported_config()
in current FFmpeg.

Created compat functions to get rid of deprecate warnings running with
both old and new FFmpeg.

src/libavcodec/lavc_common.c

@@ -347,4 +347,61 @@ get_avpixfmts_names(const enum AVPixelFormat *pixfmts)
         }
         return buf;
 }
+
+/**
+ * @param ctx   may be nullptr if codec is not
+ * @param codec may be nullptr if ctx is not
+ *
+ * If passed ctx, values such as `strict_std_compliance` may afect the result.
+ */
+static const void *
+avc_get_supported_config(const AVCodecContext *ctx, const AVCodec *codec,
+                         enum AVCodecConfig config)
+{
+#if LIBAVCODEC_VERSION_INT >  AV_VERSION_INT(61, 13, 100)
+        const void *ret = NULL;
+        int         unused_count = 0;
+        const int   rc           = avcodec_get_supported_config(
+            ctx, codec, config, /*flags*/ 0, &ret,
+            &unused_count);
+        if (rc != 0) {
+                MSG(ERROR, "Cannot get list of supported config %d for %s!\n",
+                    (int) config, codec->name);
+                return NULL;
+        }
+
+        return ret;
+#else
+        abort(); // cannot reach here (shouldn't be called)
+#endif
+}
+///< @copydoc avc_get_supported_config
+const enum AVPixelFormat *
+avc_get_supported_pix_fmts(const AVCodecContext *ctx, const AVCodec *codec)
+{
+#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(61, 13, 100)
+        return avc_get_supported_config(ctx, codec, AV_CODEC_CONFIG_PIX_FORMAT);
+#else
+        return codec->pix_fmts;
+#endif
+}
+///< @copydoc avc_get_supported_config
+const enum AVSampleFormat *
+avc_get_supported_sample_fmts(const AVCodecContext *ctx, const AVCodec *codec)
+{
+#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(61, 13, 100)
+        return avc_get_supported_config(ctx, codec, AV_CODEC_CONFIG_SAMPLE_FORMAT);
+#else
+        return codec->pix_fmts;
+#endif
+}
+///< @copydoc avc_get_supported_config
+const int *avc_get_supported_sample_rates(const AVCodecContext *ctx, const AVCodec *codec)
+{
+#if LIBAVCODEC_VERSION_INT > AV_VERSION_INT(61, 13, 100)
+        return avc_get_supported_config(ctx, codec, AV_CODEC_CONFIG_SAMPLE_RATE);
+#else
+        return codec->supported_samplerates;
+#endif
+}
 /* vi: set expandtab sw=8: */

src/libavcodec/lavc_common.h

@@ -122,6 +122,13 @@ struct audio_desc audio_desc_from_av_frame(const AVFrame *frm);
 enum AVSampleFormat audio_bps_to_av_sample_fmt(int bps, bool planar);
 const char         *get_avpixfmts_names(const enum AVPixelFormat *pixfmts);
 
+const enum AVPixelFormat *avc_get_supported_pix_fmts(const AVCodecContext *ctx,
+                                                     const AVCodec *codec);
+const enum AVSampleFormat *
+avc_get_supported_sample_fmts(const AVCodecContext *ctx, const AVCodec *codec);
+const int *avc_get_supported_sample_rates(const AVCodecContext *ctx,
+                                          const AVCodec        *codec);
+
 #ifdef __cplusplus
 }
 #endif