proper handling of samplesize

Originally committed as revision 3980 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/flvdec.c

@@ -132,6 +132,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
     		av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flags >> 4);
                 st->codec.codec_tag= (flags >> 4);
             }
+	    st->codec.bits_per_sample = (flags & 2) ? 16 : 8;
         }
     }else{
             st->codec.codec_type = CODEC_TYPE_VIDEO;

libavformat/flvenc.c

@@ -35,7 +35,7 @@ static void put_be24(ByteIOContext *pb, int value)
 }
 
 static int get_audio_flags(AVCodecContext *enc){
-    int flags = 0;
+    int flags = (enc->bits_per_sample == 16) ? 0x2 : 0x0;
 
     switch (enc->sample_rate) {
         case    44100: