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add scan_type directive for doing brute-force scans

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This commit is contained in:
Ron Pedde 2004-11-29 05:55:25 +00:00
parent 7f1ca1f552
commit 27d8a51309
6 changed files with 389 additions and 108 deletions
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4
admin-root/config.html
View File

@ -64,6 +64,10 @@ take effect.
<TD>Rescan Interval</TD>
<TD><INPUT TYPE="TEXT" @READONLY@ NAME="RESCAN_INTERVAL" VALUE="@RESCAN_INTERVAL@"></TD>
</TR>
<TR>
<TD>Scan Type</TD>
<TD><INPUT TYPE="TEXT" @READONLY@ NAME="SCAN_TYPE" VALUE="@SCAN_TYPE@"></TD>
</TR>
<TR>
<TD>Always Scan</TD>
<TD><INPUT TYPE="TEXT" @READONLY@ NAME="ALWAYS_SCAN" VALUE="@ALWAYS_SCAN@"></TD>

85
contrib/mt-daapd.conf
View File

@ -2,6 +2,14 @@
#
# This is the mt-daapd config file.
#
# If you have problems or questions with the format of this file,
# direct your questions to rpedde@users.sourceforge.net.
#
# You can also check the website at http://mt-daapd.sourceforge.net,
# as there is a growing documentation library there, peer-supported
# forums and possibly more.
#
#
# web_root (required)
@ -39,7 +47,9 @@ db_dir /var/cache/mt-daapd
#
# mp3_dir (required)
#
# Location of the mp3 files to share
# Location of the mp3 files to share. Note that because the
# files are stored in the database by inode, these must be
# in the same physical filesystem.
#
mp3_dir /mnt/mp3
@ -49,7 +59,7 @@ mp3_dir /mnt/mp3
#
# This is both the name of the server as advertised
# via rendezvous, and the name of the database
# exported via DAAP
# exported via DAAP. Also know as "What shows up in iTunes".
#
servername mt-daapd
@ -74,9 +84,9 @@ runas nobody
# See the mt-daapd.playlist file in the
# contrib directory for syntax and examples
#
# Note that static playlists will still
# show up, even if this directive is not
# specified
# This doesn't control static playlists... these
# are controlled with the "process_m3u" directive
# below.
#
playlist /etc/mt-daapd.playlist
@ -101,6 +111,7 @@ playlist /etc/mt-daapd.playlist
# play them. Perhaps this would be useful on Linux with
# Rhythmbox, once it understands daap. (hurry up!)
#
#
extensions .mp3,.m4a,.m4p
@ -145,28 +156,66 @@ extensions .mp3,.m4a,.m4p
# If background rescanning is disabled, a scan can still be forced from the
# "status" page of the administrative web interface
#
# Note that right now this is considered EXPERIMENTAL!
#
# Setting a rescan_interval lower than the time it takes to rescan
# won't hurt anything, it will just waste CPU, and make connect times
# to the daap server longer.
#
# There may be memory leaks here. If you see evidence of leaks, please
# let me (rpedde@users.sourceforge.net) know.
#
#rescan_interval 300
#
# always_scan
#
# The default behavior is not not do background rescans of the filesystem
# unless there are clients connected. The thought is to allow the drives
# to spin down unless they are in use. This might be of more importance
# in IDE drives that aren't designed to be run 24x7.
#
# Forcing a scan will always work though, even if no users are connected.
#
#
# The default behavior is not not do background rescans of the
# filesystem unless there are clients connected. The thought is to
# allow the drives to spin down unless they are in use. This might be
# of more importance in IDE drives that aren't designed to be run
# 24x7. Forcing a scan through the web interface will always work
# though, even if no users are connected.
# always_scan 0
#
# process_m3u
#
# By default m3u processing is turned off, since most m3u files
# sitting around in peoples mp3 directories have bad paths, and
# I hear about it. :)
#
# If you are sure your m3u files have good paths (i.e. unixly pathed,
# with relative paths relative to the directory the m3u is in), then
# you can turn on m3u processing by setting this directive to 1.
#
# I'm not sure "unixly" is a word, but you get the idea.
#
# process_m3u 0
#
# scan_type
#
#
# This sets how aggressively mp3 files should be scanned to determine
# file length. There are three values:
#
# 0 (Normal)
# Just scan the first mp3 frame to try and calculate size. This will
# be accurate for most files, but VBR files without an Xing tag will
# probably have wildly inaccurate file times
#
# 1 (Aggressive)
# This checks the bitrates of 10 frames in the middle of the song.
# This will still be inaccurate for VBR files without an Xing tag,
# but they probably won't be quite as inaccurate as 0. This takes
# more time, obviously, although the time hit will only happen the
# first time you scan a particular file.
#
# 2 (Painfully aggressive)
# This walks through the entire song, counting the number of frames.
# This should result in accurate song times, but will take the most
# time. Again, this will only have to be incurred the first time
# the file is indexed.
#
# scan_type 0

9
src/configfile.c
View File

@ -109,6 +109,7 @@ CONFIGELEMENT config_elements[] = {
{ 1,0,0,CONFIG_TYPE_INT,"rescan_interval",(void*)&config.rescan_interval,config_emit_int },
{ 1,0,0,CONFIG_TYPE_INT,"always_scan",(void*)&config.always_scan,config_emit_int },
{ 1,0,0,CONFIG_TYPE_INT,"process_m3u",(void*)&config.process_m3u,config_emit_int },
{ 1,0,0,CONFIG_TYPE_INT,"scan_type",(void*)&config.scan_type,config_emit_int },
{ 1,0,0,CONFIG_TYPE_STRING,"playlist",(void*)&config.playlist,config_emit_string },
{ 1,0,0,CONFIG_TYPE_STRING,"extensions",(void*)&config.extensions,config_emit_string },
{ 1,0,0,CONFIG_TYPE_STRING,"password",(void*)&config.readpassword, config_emit_string },
@ -173,7 +174,12 @@ int config_read(char *file) {
return -1;
}
#ifdef NSLU2
config.always_scan=0;
#else
config.always_scan=1;
#endif
config.configfile=strdup(file);
config.web_root=NULL;
config.adminpassword=NULL;
@ -185,6 +191,7 @@ int config_read(char *file) {
config.logfile=NULL;
config.rescan_interval=0;
config.process_m3u=0;
config.scan_type=0;
/* DWB: use alloced space so it can be freed without errors */
config.extensions=strdup(".mp3");
@ -336,6 +343,8 @@ int config_write(WS_CONNINFO *pwsc) {
fprintf(configfile,"extensions\t%s\n",ws_getvar(pwsc,"extensions"));
fprintf(configfile,"db_dir\t\t%s\n",ws_getvar(pwsc,"db_dir"));
fprintf(configfile,"rescan_interval\t%s\n",ws_getvar(pwsc,"rescan_interval"));
fprintf(configfile,"scan_type\t%d\n",ws_getvar(pwsc,"scan_type"));
if(ws_getvar(pwsc,"always_scan") && strlen(ws_getvar(pwsc,"always_scan")))
fprintf(configfile,"always_scan\t%s\n",ws_getvar(pwsc,"always_scan"));
if(ws_getvar(pwsc,"art_filename") && strlen(ws_getvar(pwsc,"art_filename")))
fprintf(configfile,"art_filename\t%s\n",ws_getvar(pwsc,"art_filename"));

1
src/daapd.h
View File

@ -53,6 +53,7 @@ typedef struct tag_config {
int rescan_interval; /**< How often to do a background rescan of the file system */
int always_scan; /**< 0 to minimize disk usage (embedded devices) */
int process_m3u; /**< Should we process m3u files? */
int scan_type; /**< How hard to search mp3 files. see scan_get_mp3fileinfo() */
char *adminpassword; /**< Password to web management pages */
char *readpassword; /**< iTunes password */
char *mp3dir; /**< root directory of the mp3 files */

366
src/mp3-scanner.c
View File

@ -59,21 +59,27 @@
* Typedefs
*/
/**
* Struct to keep info about the information gleaned from
* the mp3 frame header.
*/
typedef struct tag_scan_frameinfo {
int layer;
int bitrate;
int samplerate;
int stereo;
int layer; /**< 1, 2, or 3, representing Layer I, II, and III */
int bitrate; /**< Bitrate in kbps (128, 64, etc) */
int samplerate; /**< Samplerate (e.g. 44100) */
int stereo; /**< Any kind of stereo.. joint, dual mono, etc */
int frame_length;
int crc_protected;
int samples_per_frame;
int padding;
int xing_offset;
int frame_length; /**< Frame length in bytes - calculated */
int crc_protected; /**< Is the frame crc protected? */
int samples_per_frame; /**< Samples per frame - calculated field */
int padding; /**< Whether or not there is a padding sample */
int xing_offset; /**< Where the xing header should be relative to end of hdr */
int number_of_frames; /**< Number of frames in the song */
double version;
int frame_offset; /**< Where this frame was found */
double version; /**< MPEG version (e.g. 2.0, 2.5, 1.0) */
int is_cbr;
int is_valid;
} SCAN_FRAMEINFO;
@ -266,22 +272,28 @@ char *scan_winamp_genre[] = {
/*
* Forwards
*/
int scan_path(char *path);
int scan_gettags(char *file, MP3FILE *pmp3);
int scan_get_mp3tags(char *file, MP3FILE *pmp3);
int scan_get_aactags(char *file, MP3FILE *pmp3);
int scan_get_nultags(char *file, MP3FILE *pmp3) { return 0; };
int scan_get_fileinfo(char *file, MP3FILE *pmp3);
int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3);
int scan_get_aacfileinfo(char *file, MP3FILE *pmp3);
int scan_get_nulfileinfo(char *file, MP3FILE *pmp3) { return 0; };
int scan_get_urlfileinfo(char *file, MP3FILE *pmp3);
static int scan_path(char *path);
static int scan_gettags(char *file, MP3FILE *pmp3);
static int scan_get_mp3tags(char *file, MP3FILE *pmp3);
static int scan_get_aactags(char *file, MP3FILE *pmp3);
static int scan_get_nultags(char *file, MP3FILE *pmp3) { return 0; };
static int scan_get_fileinfo(char *file, MP3FILE *pmp3);
static int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3);
static int scan_get_aacfileinfo(char *file, MP3FILE *pmp3);
static int scan_get_nulfileinfo(char *file, MP3FILE *pmp3) { return 0; };
static int scan_get_urlfileinfo(char *file, MP3FILE *pmp3);
int scan_freetags(MP3FILE *pmp3);
void scan_static_playlist(char *path, struct dirent *pde, struct stat *psb);
void scan_music_file(char *path, struct dirent *pde, struct stat *psb);
static int scan_freetags(MP3FILE *pmp3);
static void scan_static_playlist(char *path, struct dirent *pde, struct stat *psb);
static void scan_music_file(char *path, struct dirent *pde, struct stat *psb);
void make_composite_tags(MP3FILE *pmp3);
static int scan_decode_mp3_frame(unsigned char *frame, SCAN_FRAMEINFO *pfi);
static time_t mac_to_unix_time(int t);
/*
* Typedefs
*/
typedef struct {
char* suffix;
@ -299,6 +311,12 @@ static taghandler taghandlers[] = {
{ NULL, 0 }
};
/**
* Convert mac time to unix time (different epochs)
*
* param t time since mac epoch
*/
time_t mac_to_unix_time(int t) {
struct timeval tv;
struct timezone tz;
@ -1233,7 +1251,7 @@ int scan_decode_mp3_frame(unsigned char *frame, SCAN_FRAMEINFO *pfi) {
bitrate_index=(frame[2] & 0xF0) >> 4;
samplerate_index=(frame[2] & 0x0C) >> 2;
if(bitrate_index == 0xF) {
if((bitrate_index == 0xF) || (bitrate_index==0x0)) {
pfi->is_valid=0;
return -1;
}
@ -1279,16 +1297,169 @@ int scan_decode_mp3_frame(unsigned char *frame, SCAN_FRAMEINFO *pfi) {
pfi->frame_length = 144 * pfi->bitrate * 1000 / pfi->samplerate + pfi->padding;
}
if((pfi->frame_length > 2880) || (pfi->frame_length <= 0)) {
pfi->is_valid=0;
return -1;
}
pfi->is_valid=1;
return 0;
}
/*
* scan_get_mp3fileinfo
/**
* Scan 10 frames from the middle of the file and determine an
* average bitrate from that. It might not be as accurate as a full
* frame count, but it's probably Close Enough (tm)
*
* @param infile file to scan for average bitrate
* @param pfi pointer to frame info struct to put the bitrate into
*/
void scan_get_average_bitrate(FILE *infile, SCAN_FRAMEINFO *pfi) {
fpos_t file_size;
unsigned char frame_buffer[2900];
unsigned char header[4];
int index=0;
int found=0;
fpos_t pos;
SCAN_FRAMEINFO fi;
int frame_count=0;
int bitrate_total=0;
DPRINTF(E_DBG,L_SCAN,"Starting averaging bitrate\n");
fseek(infile,0,SEEK_END);
file_size=ftell(infile);
pos=file_size/2;
/* now, find the first frame */
fseek(infile,pos,SEEK_SET);
if(fread(frame_buffer,1,sizeof(frame_buffer),infile) != sizeof(frame_buffer))
return;
while(!found) {
while((frame_buffer[index] != 0xFF) && (index < (sizeof(frame_buffer)-4)))
index++;
if(index >= (sizeof(frame_buffer)-4)) { /* largest mp3 frame is 2880 bytes */
DPRINTF(E_DBG,L_SCAN,"Could not find frame... quitting\n");
return;
}
if(!scan_decode_mp3_frame(&frame_buffer[index],&fi)) {
/* see if next frame is valid */
fseek(infile,pos + index + fi.frame_length,SEEK_SET);
if(fread(header,1,sizeof(header),infile) != sizeof(header)) {
DPRINTF(E_DBG,L_SCAN,"Could not read frame header\n");
return;
}
if(!scan_decode_mp3_frame(header,&fi))
found=1;
}
if(!found)
index++;
}
pos += index;
/* found first frame. Let's move */
while(frame_count < 10) {
fseek(infile,pos,SEEK_SET);
if(fread(header,1,sizeof(header),infile) != sizeof(header)) {
DPRINTF(E_DBG,L_SCAN,"Could not read frame header\n");
return;
}
if(scan_decode_mp3_frame(header,&fi)) {
DPRINTF(E_DBG,L_SCAN,"Invalid frame header while averaging\n");
return;
}
bitrate_total += fi.bitrate;
frame_count++;
pos += fi.frame_length;
}
DPRINTF(E_DBG,L_SCAN,"Old bitrate: %d\n",pfi->bitrate);
pfi->bitrate = bitrate_total/frame_count;
DPRINTF(E_DBG,L_SCAN,"New bitrate: %d\n",pfi->bitrate);
return;
}
/**
* do a full frame-by-frame scan of the file, counting frames
* as we go to try and get a more accurate song length estimate.
* If the song turns out to be CBR, then we'll not set the frame
* length. Instead we'll use the file size estimate, since it is
* more consistent with iTunes.
*
* @param infile file to scan for frame count
* @param pfi pointer to frame info struct to put framecount into
*/
void scan_get_frame_count(FILE *infile, SCAN_FRAMEINFO *pfi) {
int pos;
int frames=0;
unsigned char frame_buffer[4];
SCAN_FRAMEINFO fi;
fpos_t file_size;
int err=0;
int cbr=1;
int last_bitrate=0;
DPRINTF(E_DBG,L_SCAN,"Starting frame count\n");
fseek(infile,0,SEEK_END);
file_size=ftell(infile);
pos=pfi->frame_offset;
while(1) {
err=1;
DPRINTF(E_DBG,L_SCAN,"Seeking to %d\n",pos);
fseek(infile,pos,SEEK_SET);
if(fread(frame_buffer,1,sizeof(frame_buffer),infile) == sizeof(frame_buffer)) {
/* check for valid frame */
if(!scan_decode_mp3_frame(frame_buffer,&fi)) {
frames++;
pos += fi.frame_length;
err=0;
if((last_bitrate) && (fi.bitrate != last_bitrate))
cbr=0;
last_bitrate=fi.bitrate;
/* no point in brute scan of a cbr file... */
if(cbr && (frames > 100)) {
DPRINTF(E_DBG,L_SCAN,"File appears to be CBR... quitting frame count\n");
return;
}
}
}
if(err) {
if(pos > (file_size - 4096)) { /* probably good enough */
pfi->number_of_frames=frames;
DPRINTF(E_DBG,L_SCAN,"Estimated frame count: %d\n",frames);
return;
} else {
DPRINTF(E_DBG,L_SCAN,"Frame count aborted on error. Pos=%d, Count=%d\n",
pos, frames);
return;
}
}
}
}
/**
* Get information from the file headers itself -- like
* song length, bit rate, etc.
*
* @param file File to get info for
* @param pmp3 where to put the found information
*/
int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
FILE *infile;
@ -1300,15 +1471,19 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
unsigned char buffer[1024];
int index;
int number_of_frames=0;
int xing_flags;
int found;
int first_check;
char frame_buffer[4];
if(!(infile=fopen(file,"rb"))) {
DPRINTF(E_WARN,L_SCAN,"Could not open %s for reading\n",file);
return -1;
}
memset((void*)&fi,0x00,sizeof(fi));
fseek(infile,0,SEEK_END);
file_size=ftell(infile);
fseek(infile,0,SEEK_SET);
@ -1327,87 +1502,105 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
pid3=(SCAN_ID3HEADER*)buffer;
found=0;
fp_size=0;
if(strncmp(pid3->id,"ID3",3)==0) {
/* found an ID3 header... */
DPRINTF(E_DBG,L_SCAN,"Found ID3 header\n");
size = (pid3->size[0] << 21 | pid3->size[1] << 14 |
pid3->size[2] << 7 | pid3->size[3]);
fp_size=size + sizeof(SCAN_ID3HEADER);
first_check=1;
DPRINTF(E_DBG,L_SCAN,"Header length: %d\n",size);
}
index = 0;
/* Here we start the brute-force header seeking. Sure wish there
* weren't so many crappy mp3 files out there
*/
while(!found) {
fseek(infile,fp_size,SEEK_SET);
DPRINTF(E_DBG,L_SCAN,"Reading in new block at %d\n",(int)fp_size);
if(fread(buffer,1,sizeof(buffer),infile) < sizeof(buffer)) {
DPRINTF(E_LOG,L_SCAN,"Short file: %s\n",file);
DPRINTF(E_LOG,L_SCAN,"Short read: %s\n",file);
fclose(infile);
return -1;
break;
}
index=0;
found=0;
if(scan_decode_mp3_frame(&buffer[index],&fi)) { /* Bad frame header */
DPRINTF(E_DBG,L_SCAN,"Starting brute-force search for frame header\n");
while(!found) {
while((buffer[index] != 0xFF) && (index < (sizeof(buffer)-50)))
index++;
if((first_check) && (index)) {
fp_size=0;
while(!found) {
DPRINTF(E_DBG,L_SCAN,"Seeking to %d\n",(int)fp_size);
fseek(infile,fp_size,SEEK_SET);
if(fread(buffer,1,sizeof(buffer),infile) < sizeof(buffer)) {
DPRINTF(E_LOG,L_SCAN,"Can't find valid MP3 frame for %s\n",file);
fclose(infile);
return -1;
DPRINTF(E_DBG,L_SCAN,"Bad header... dropping back for full frame search\n");
first_check=0;
break;
}
/* look for header */
index=0;
while(!found) {
if(index > sizeof(buffer)-50) {
if(index > sizeof(buffer) - 50) {
fp_size += index;
DPRINTF(E_DBG,L_SCAN,"Block exhausted\n");
break; /* read in the next block */
break;
}
if(!scan_decode_mp3_frame(&buffer[index],&fi)) {
DPRINTF(E_DBG,L_SCAN,"valid header at %d\n",index);
if(strncasecmp((char*)&buffer[index+fi.xing_offset+4],"XING",4) == 0) {
/* no need to check further... if there is a xing header there,
* this is definately a valid frame */
found=1;
fp_size += index;
} else {
/* No Xing... check for next frame */
DPRINTF(E_DBG,L_SCAN,"Found valid frame at %04x\n",(int)fp_size+index);
DPRINTF(E_DBG,L_SCAN,"Checking at %04x\n",(int)fp_size+index+fi.frame_length);
fseek(infile,fp_size + index + fi.frame_length,SEEK_SET);
if(fread(frame_buffer,1,sizeof(frame_buffer),infile) == sizeof(frame_buffer)) {
if(!scan_decode_mp3_frame(frame_buffer,&fi)) {
found=1;
fp_size += index;
}
}
if(!found) {
DPRINTF(E_DBG,L_SCAN,"Didn't pan out.\n");
}
}
}
/* should check next frame... */
found=1;
}
if(!found)
if(!found) {
index++;
if (first_check) {
/* if the header info was wrong about where the data started,
* then start a brute-force scan from the beginning of the file.
* don't want to just scan forward, because we might have already
* missed the xing header
*/
DPRINTF(E_DBG,L_SCAN,"Bad header... dropping back for full frame search\n");
first_check=0;
fp_size=0;
break;
}
}
}
}
file_size -= fp_size;
/*
while(((buffer[index] != 0xFF) || (buffer[index+1] < 224)) &&
(index < (sizeof(buffer)-(10 + 18 + 32)))) {
index++;
}
if(index) {
DPRINTF(E_DBG,L_SCAN,"Scanned forward %d bytes to find frame header\n",index);
}
*/
fi.frame_offset=fp_size;
if(scan_decode_mp3_frame(&buffer[index],&fi)) {
fclose(infile);
DPRINTF(E_DBG,L_SCAN,"Could not find sync frame\n");
DPRINTF(E_LOG,L_SCAN,"Could not find sync frame: %s\n",file);
DPRINTF(E_LOG,L_SCAN,"If this is a valid mp3 file that plays in "
"other applications, please email me at rpedde@users.sourceforge.net "
"and tell me you got this error. Thanks");
return 0;
}
pmp3->bitrate=fi.bitrate;
pmp3->samplerate=fi.samplerate;
DPRINTF(E_DBG,L_SCAN," MPEG Version: %0.1g\n",fi.version);
DPRINTF(E_DBG,L_SCAN," Layer: %d\n",fi.layer);
DPRINTF(E_DBG,L_SCAN," Sample Rate: %d\n",fi.samplerate);
@ -1423,21 +1616,39 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
if(xing_flags & 0x1) {
/* Frames field is valid... */
number_of_frames=*((int*)&buffer[index+fi.xing_offset+4+8]);
number_of_frames=ntohs(number_of_frames);
fi.number_of_frames=*((int*)&buffer[index+fi.xing_offset+4+8]);
fi.number_of_frames=ntohs(fi.number_of_frames);
}
}
if((config.scan_type != 0) &&
(fi.number_of_frames == 0) &&
(!pmp3->song_length)) {
/* We have no good estimate of song time, and we want more
* aggressive scanning */
DPRINTF(E_DBG,L_SCAN,"Starting aggressive file length scan\n");
if(config.scan_type == 1) {
/* get average bitrate */
scan_get_average_bitrate(infile, &fi);
} else {
/* get full frame count */
scan_get_frame_count(infile, &fi);
}
}
pmp3->bitrate=fi.bitrate;
pmp3->samplerate=fi.samplerate;
/* guesstimate the file length */
if(!pmp3->song_length) { /* could have gotten it from the tag */
/* DWB: use ms time instead of seconds, use doubles to
avoid overflow */
if(!number_of_frames) { /* not vbr */
if(!fi.number_of_frames) { /* not vbr */
pmp3->song_length = (int) ((double) file_size * 8. /
(double) fi.bitrate);
} else {
pmp3->song_length = (int) ((double)(number_of_frames*fi.samples_per_frame*1000.)/
pmp3->song_length = (int) ((double)(fi.number_of_frames*fi.samples_per_frame*1000.)/
(double) fi.samplerate);
}
@ -1448,6 +1659,13 @@ int scan_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
return 0;
}
/**
* Manually build tags. Set artist to computer/orchestra
* if there is already no artist. Perhaps this could be
* done better, but I'm not sure what else to do here.
*
* @param song MP3FILE of the file to build composite tags for
*/
void make_composite_tags(MP3FILE *song)
{
int len;

2
src/mp3-scanner.h
View File

@ -70,9 +70,9 @@ typedef struct tag_mp3file {
} MP3FILE;
extern int scan_init(char *path);
extern void make_composite_tags(MP3FILE *song);
/* this should be refactored out of here... */
extern off_t aac_drilltoatom(FILE *aac_fp, char *atom_path, unsigned int *atom_length);
#endif /* _MP3_SCANNER_H_ */