[FFmpeg-cvslog] lavc/amrwbdec: Add a comment about the missing muting technique.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <ceffmpeg at gmail.com> | Sat Apr 11 14:23:51 2020 +0200| [53254234370367b0996d9322f871de985ebbfa3c] | committer: Carl Eugen Hoyos

lavc/amrwbdec: Add a comment about the missing muting technique.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=53254234370367b0996d9322f871de985ebbfa3c
---

 libavcodec/amrwbdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/amrwbdec.c b/libavcodec/amrwbdec.c
index 7d357a2685..555c4bc45d 100644
--- a/libavcodec/amrwbdec.c
+++ b/libavcodec/amrwbdec.c
@@ -1125,6 +1125,8 @@ static int amrwb_decode_frame(AVCodecContext *avctx, void *data,
         av_log(avctx, AV_LOG_ERROR, "Encountered a bad or corrupted frame\n");
 
     if (ctx->fr_cur_mode == NO_DATA || !ctx->fr_quality) {
+        /* The specification suggests a "random signal" and
+           "a muting technique" to "gradually decrease the output level". */
         av_samples_set_silence(&frame->data[0], 0, frame->nb_samples, 1, AV_SAMPLE_FMT_FLT);
         *got_frame_ptr = 1;
         return expected_fr_size;