Force float decoding for libopus and disable the usage of FFopus decoder

ffmpeg_opus_fix.diff

diff --git a/libavcodec/libopusdec.c b/libavcodec/libopusdec.c
index 31a04df..2857b39 100644
--- a/libavcodec/libopusdec.c
+++ b/libavcodec/libopusdec.c
@@ -63,8 +63,7 @@ static av_cold int libopus_decode_init(AVCodecContext *avc)
     }
 
     avc->sample_rate    = 48000;
-    avc->sample_fmt     = avc->request_sample_fmt == AV_SAMPLE_FMT_FLT ?
-                          AV_SAMPLE_FMT_FLT : AV_SAMPLE_FMT_S16;
+    avc->sample_fmt     = AV_SAMPLE_FMT_FLT;
     av_channel_layout_uninit(&avc->ch_layout);
     if (channels > 8) {
         avc->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
diff --git a/libavcodec/opusdec.c b/libavcodec/opusdec.c
index c04aa59..a6c43f3 100644
--- a/libavcodec/opusdec.c
+++ b/libavcodec/opusdec.c
@@ -713,6 +713,6 @@ const FFCodec ff_opus_decoder = {
     .close           = opus_decode_close,
     FF_CODEC_DECODE_CB(opus_decode_packet),
     .flush           = opus_decode_flush,
-    .p.capabilities  = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
+    .p.capabilities  = AV_CODEC_CAP_EXPERIMENTAL | AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
     .caps_internal   = FF_CODEC_CAP_INIT_CLEANUP,
 };