avcodec: deprecate sonic

This is an experimental and research codec of which ffmpeg is the only
encoder and decoder, development has stalled since 2013 and these files
don't exist in the wild.

Deprecate the encoders to be removed next major bump, decoders to be
removed one bump afterwards. We also disable the the encoders by default
in configure, the decoders should be disabled by default next bump.

Signed-off-by: J. Dekker <jdek@itanimul.li>
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

configure

@@ -4359,6 +4359,9 @@ do_random(){
     $action $(rand_list "$@" | awk "BEGIN { srand($random_seed) } \$1 == \"prob\" { prob = \$2; next } rand() < prob { print }")
 }
 
+# deprecated components (disabled by default)
+disable sonic_encoder sonic_ls_encoder
+
 for opt do
     optval="${opt#*=}"
     case "$opt" in

libavcodec/version_major.h

@@ -52,5 +52,9 @@
 
 // reminder to remove the OMX encoder on next major bump
 #define FF_CODEC_OMX               (LIBAVCODEC_VERSION_MAJOR < 62)
+// reminder to remove Sonic Lossy/Lossless encoders on next major bump
+#define FF_CODEC_SONIC_ENC         (LIBAVCODEC_VERSION_MAJOR < 62)
+// reminder to remove Sonic decoder on next-next major bump
+#define FF_CODEC_SONIC_DEC         (LIBAVCODEC_VERSION_MAJOR < 63)
 
 #endif /* AVCODEC_VERSION_MAJOR_H */