lavf/caf: Support demuxing Opus.

Introduced in macOS High Sierra and iOS 11.

Author: cehoyos

libavformat/caf.c

@@ -52,6 +52,7 @@ const AVCodecTag ff_codec_caf_tags[] = {
     { AV_CODEC_ID_MP2,             MKTAG('.','m','p','2') },
     { AV_CODEC_ID_MP3,             MKTAG('.','m','p','3') },
     { AV_CODEC_ID_MP3,             MKTAG('m','s', 0 ,'U') },
+    { AV_CODEC_ID_OPUS,            MKTAG('o','p','u','s') },
     { AV_CODEC_ID_PCM_ALAW,        MKTAG('a','l','a','w') },
     { AV_CODEC_ID_PCM_MULAW,       MKTAG('u','l','a','w') },
     { AV_CODEC_ID_QCELP,           MKTAG('Q','c','l','p') },

libavformat/cafdec.c

@@ -166,6 +166,8 @@ static int read_kuki_chunk(AVFormatContext *s, int64_t size)
             }
             avio_skip(pb, size - ALAC_NEW_KUKI);
         }
+    } else if (st->codecpar->codec_id == AV_CODEC_ID_OPUS) {
+        avio_skip(pb, size);
     } else {
         av_freep(&st->codecpar->extradata);
         if (ff_get_extradata(s, st->codecpar, pb, size) < 0)

libavformat/cafenc.c

@@ -117,6 +117,7 @@ static int caf_write_header(AVFormatContext *s)
 
     switch (par->codec_id) {
     case AV_CODEC_ID_AAC:
+    case AV_CODEC_ID_OPUS:
         av_log(s, AV_LOG_ERROR, "muxing codec currently unsupported\n");
         return AVERROR_PATCHWELCOME;
     }

libavformat/version.h

@@ -33,7 +33,7 @@
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  57
 #define LIBAVFORMAT_VERSION_MINOR  82
-#define LIBAVFORMAT_VERSION_MICRO 100
+#define LIBAVFORMAT_VERSION_MICRO 101
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \