Parse APE metadata tags in Musepack SV7 files

Patch by Matti Hamalainen (to get his mail address remove common endings from
 "mhamalainen@studentsnen.oamknen.finen")
Thread: [PATCH]5/6 Add APE tag metadata reading support in Musepack SV7 demuxer

Originally committed as revision 19630 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/Makefile

@@ -95,7 +95,7 @@ OBJS-$(CONFIG_MOV_MUXER)                 += movenc.o riff.o isom.o avc.o
 OBJS-$(CONFIG_MP2_MUXER)                 += mp3.o id3v1.o
 OBJS-$(CONFIG_MP3_DEMUXER)               += mp3.o id3v1.o id3v2.o
 OBJS-$(CONFIG_MP3_MUXER)                 += mp3.o id3v1.o
-OBJS-$(CONFIG_MPC_DEMUXER)               += mpc.o id3v1.o id3v2.o
+OBJS-$(CONFIG_MPC_DEMUXER)               += mpc.o id3v1.o id3v2.o apetag.o
 OBJS-$(CONFIG_MPC8_DEMUXER)              += mpc8.o
 OBJS-$(CONFIG_MPEG1SYSTEM_MUXER)         += mpegenc.o
 OBJS-$(CONFIG_MPEG1VCD_MUXER)            += mpegenc.o

libavformat/mpc.c

@@ -22,6 +22,7 @@
 #include "libavcodec/get_bits.h"
 #include "avformat.h"
 #include "id3v2.h"
+#include "apetag.h"
 
 #define MPC_FRAMESIZE  1152
 #define DELAY_FRAMES   32
@@ -111,6 +112,13 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
     s->start_time = 0;
     s->duration = (int64_t)c->fcount * MPC_FRAMESIZE * AV_TIME_BASE / st->codec->sample_rate;
 
+    /* try to read APE tags */
+    if (!url_is_streamed(s->pb)) {
+        int64_t pos = url_ftell(s->pb);
+        ff_ape_parse_tag(s);
+        url_fseek(s->pb, pos, SEEK_SET);
+    }
+
     return 0;
 }