avformat: support shorten in nistshpere demuxer

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/shorten.c

@@ -387,6 +387,9 @@ static int read_header(ShortenContext *s)
     if (s->version > 1)
         s->lpcqoffset = V2LPCQOFFSET;
 
+    if (s->avctx->extradata_size > 0)
+        goto end;
+
     if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) {
         av_log(s->avctx, AV_LOG_ERROR,
                "missing verbatim section at beginning of stream\n");
@@ -407,6 +410,7 @@ static int read_header(ShortenContext *s)
     if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0)
         return ret;
 
+end:
     s->cur_chan = 0;
     s->bitshift = 0;
 

libavformat/nistspheredec.c

@@ -34,7 +34,7 @@ static int nist_probe(AVProbeData *p)
 
 static int nist_read_header(AVFormatContext *s)
 {
-    char buffer[32], coding[32] = "pcm", format[32] = "01";
+    char buffer[256], coding[32] = "pcm", format[32] = "01";
     int bps = 0, be = 0;
     int32_t header_size = -1;
     AVStream *st;
@@ -69,6 +69,10 @@ static int nist_read_header(AVFormatContext *s)
             } else if (!av_strcasecmp(coding, "ulaw") ||
                        !av_strcasecmp(coding, "mu-law")) {
                 st->codec->codec_id = AV_CODEC_ID_PCM_MULAW;
+            } else if (!av_strncasecmp(coding, "pcm,embedded-shorten", 20)) {
+                st->codec->codec_id = AV_CODEC_ID_SHORTEN;
+                if (ff_alloc_extradata(st->codec, 1))
+                    st->codec->extradata[0] = 1;
             } else {
                 avpriv_request_sample(s, "coding %s", coding);
             }