filter/ffmpeg: fix FFmpeg 5.1 deprecation warnings

src/filter/plugins/FfmpegFilter.cxx

@@ -40,10 +40,15 @@ FfmpegFilter::FfmpegFilter(const AudioFormat &in_audio_format,
 	 buffer_sink(_buffer_sink),
 	 in_format(Ffmpeg::ToFfmpegSampleFormat(in_audio_format.format)),
 	 in_sample_rate(in_audio_format.sample_rate),
+#if LIBAVUTIL_VERSION_INT < AV_VERSION_INT(57, 25, 100)
 	 in_channels(in_audio_format.channels),
+#endif
 	 in_audio_frame_size(in_audio_format.GetFrameSize()),
 	 out_audio_frame_size(_out_audio_format.GetFrameSize())
 {
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 25, 100)
+	av_channel_layout_default(&in_ch_layout, in_audio_format.channels);
+#endif
 }
 
 ConstBuffer<void>
@@ -54,7 +59,11 @@ FfmpegFilter::FilterPCM(ConstBuffer<void> src)
 	frame.Unref();
 	frame->format = in_format;
 	frame->sample_rate = in_sample_rate;
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 25, 100)
+	frame->ch_layout = in_ch_layout;
+#else
 	frame->channels = in_channels;
+#endif
 	frame->nb_samples = src.size / in_audio_frame_size;
 
 	frame.GetBuffer();

src/filter/plugins/FfmpegFilter.hxx

@@ -35,7 +35,13 @@ class FfmpegFilter final : public Filter {
 
 	FfmpegBuffer interleave_buffer;
 
-	const int in_format, in_sample_rate, in_channels;
+	const int in_format, in_sample_rate;
+
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 25, 100)
+	AVChannelLayout in_ch_layout;
+#else
+	const int in_channels;
+#endif
 
 	const size_t in_audio_frame_size;
 	const size_t out_audio_frame_size;

src/lib/ffmpeg/DetectFilterFormat.cxx

@@ -48,7 +48,11 @@ DetectFilterOutputFormat(const AudioFormat &in_audio_format,
 	Frame frame;
 	frame->format = ToFfmpegSampleFormat(in_audio_format.format);
 	frame->sample_rate = in_audio_format.sample_rate;
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 25, 100)
+	av_channel_layout_default(&frame->ch_layout, in_audio_format.channels);
+#else
 	frame->channels = in_audio_format.channels;
+#endif
 	frame->nb_samples = 1;
 
 	frame.GetBuffer();
@@ -75,8 +79,14 @@ DetectFilterOutputFormat(const AudioFormat &in_audio_format,
 	if (sample_format == SampleFormat::UNDEFINED)
 		throw std::runtime_error("Unsupported FFmpeg sample format");
 
+#if LIBAVUTIL_VERSION_INT >= AV_VERSION_INT(57, 25, 100)
+	const unsigned out_channels = frame->ch_layout.nb_channels;
+#else
+	const unsigned out_channels = frame->channels;
+#endif
+
 	return CheckAudioFormat(frame->sample_rate, sample_format,
-				frame->channels);
+				out_channels);
 }
 
 } // namespace Ffmpeg