flacdec: get total number of samples from STREAMINFO

Originally committed as revision 16768 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/flac.h

@@ -53,6 +53,7 @@ enum {
     int samplerate;         /**< sample rate                             */\
     int channels;           /**< number of channels                      */\
     int bps;                /**< bits-per-sample                         */\
+    int64_t samples;        /**< total number of samples                 */\
 
 typedef struct FLACStreaminfo {
     FLACSTREAMINFO

libavcodec/flacdec.c

@@ -169,7 +169,8 @@ void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
     avctx->channels = s->channels;
     avctx->sample_rate = s->samplerate;
 
-    skip_bits(&gb, 36); /* total num of samples */
+    s->samples  = get_bits_long(&gb, 32) << 4;
+    s->samples |= get_bits_long(&gb, 4);
 
     skip_bits(&gb, 64); /* md5 sum */
     skip_bits(&gb, 64); /* md5 sum */