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Refactoring scanning -- split aac scanning from mp3-scanner

This commit is contained in:
Ron Pedde 2005-05-29 23:44:23 +00:00
parent baca93b823
commit 5915acfa81
9 changed files with 439 additions and 382 deletions
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11
src/Makefile.am
View File

@ -18,11 +18,11 @@ ORENDSRC=rend-osx.c rend-unix.c
endif
if COND_OGGVORBIS
OGGVORBISSRC=ogg.c
OGGVORBISSRC=scan-ogg.c
endif
if COND_FLAC
FLACSRC=flac.c
FLACSRC=scan-flac.c
endif
if COND_SQLITE
@ -35,12 +35,13 @@ mt_daapd_SOURCES = main.c daapd.h rend.h uici.c uici.h webserver.c \
webserver.h configfile.c configfile.h err.c err.h restart.c restart.h \
mp3-scanner.h mp3-scanner.c rend-unix.h strcasestr.c strcasestr.h \
strsep.c dynamic-art.c dynamic-art.h query.c query.h ssc.c ssc.h \
db-generic.c db-generic.h dispatch.c dispatch.h wma.c \
scan-xml.c rxml.c rxml.h redblack.c redblack.h \
db-generic.c db-generic.h dispatch.c dispatch.h \
rxml.c rxml.h redblack.c redblack.h \
scan-xml.c scan-wma.c scan-aac.c scan-aac.h \
$(PRENDSRC) $(ORENDSRC) $(HRENDSRC) $(OGGVORBISSRC) $(FLACSRC) \
$(SQLITEDB)
EXTRA_DIST = mDNS.c mDNSClientAPI.h mDNSDebug.h mDNSPosix.c \
mDNSUNP.c mDNSPlatformFunctions.h mDNSPosix.h mDNSUNP.h \
rend-howl.c rend-posix.c rend-osx.c \
strcasestr.h ogg.c flac.c dbs-sqlite.c dbs-sqlite.h
strcasestr.h scan-ogg.c scan-flac.c dbs-sqlite.c dbs-sqlite.h

10
src/dynamic-art.c
View File

@ -35,6 +35,7 @@
#include "err.h"
#include "restart.h"
#include "mp3-scanner.h"
#include "scan-aac.h"
#define BLKSIZE PIPE_BUF
@ -224,7 +225,7 @@ off_t da_aac_rewrite_stco_atom(off_t extra_size, int out_fd, FILE *aac_fp,
/* Drill down to the 'stco' atom which contains offsets to chunks in
the 'mdat' section. These offsets need to be readjusted. */
atom_offset = aac_drilltoatom(aac_fp, "moov:trak:mdia:minf:stbl:stco",
atom_offset = scan_aac_drilltoatom(aac_fp, "moov:trak:mdia:minf:stbl:stco",
&atom_length);
if (atom_offset != -1) {
/* Skip flags */
@ -469,11 +470,12 @@ off_t da_aac_attach_image(int img_fd, int out_fd, int aac_fd, int offset)
aac_fp = fdopen(dup(aac_fd), "r");
stco_atom_pos = aac_drilltoatom(aac_fp, "moov:trak:mdia:minf:stbl:stco",
stco_atom_pos = scan_aac_drilltoatom(aac_fp,
"moov:trak:mdia:minf:stbl:stco",
&atom_length);
ilst_atom_pos = aac_drilltoatom(aac_fp, "moov:udta:meta:ilst",
ilst_atom_pos = scan_aac_drilltoatom(aac_fp, "moov:udta:meta:ilst",
&atom_length);
last_pos = aac_drilltoatom(aac_fp, "mdat", &atom_length);
last_pos = scan_aac_drilltoatom(aac_fp, "mdat", &atom_length);
if (last_pos != -1) {
if (offset >= last_pos) {

385
src/mp3-scanner.c
View File

@ -262,8 +262,6 @@ char *scan_winamp_genre[] = {
"Unknown"
};
#define WINAMP_GENRE_UNKNOWN 148
/*
* Typedefs
*/
@ -299,27 +297,35 @@ static void scan_static_playlist(char *path);
static void scan_music_file(char *path, struct dirent *pde, struct stat *psb);
static int scan_decode_mp3_frame(unsigned char *frame, SCAN_FRAMEINFO *pfi);
static time_t mac_to_unix_time(int t);
static TAGHANDLER *scan_gethandler(char *type);
/* EXTERNAL SCANNERS */
#ifdef OGGVORBIS
/** @see scan-ogg.c */
extern int scan_get_ogginfo(char *filename, MP3FILE *pmp3);
#endif
#ifdef FLAC
/** @see scan-flac.c */
extern int scan_get_flacinfo(char *filename, MP3FILE *pmp3);
#endif
/** \see wma.c */
int scan_get_wmainfo(char *filename, MP3FILE *pmp3);
/** @see scan-wma.c */
extern int scan_get_wmainfo(char *filename, MP3FILE *pmp3);
/** @see scan-aac.c */
extern int scan_get_aacinfo(char *filename, MP3FILE *pmp3);
/* playlist scanners */
/** \see scan-xml.c */
/** @see scan-xml.c */
int scan_xml_playlist(char *filename);
/* For known types, I'm gong to use the "official" apple
* daap.songformat, daap.songdescription, and daap.songcodecsubtype.
* If I we don't have "official" ones, we can make them up the
@ -342,10 +348,10 @@ int scan_xml_playlist(char *filename);
* This system is broken, and won't work with something like a .cue file
*/
static TAGHANDLER taghandlers[] = {
{ "aac", scan_get_aactags, scan_get_aacfileinfo, "m4a", "mp4a", "AAC audio file" },
{ "mp4", scan_get_aactags, scan_get_aacfileinfo, "m4a", "mp4a", "AAC audio file" },
{ "m4a", scan_get_aactags, scan_get_aacfileinfo, "m4a", "mp4a", "AAC audio file" },
{ "m4p", scan_get_aactags, scan_get_aacfileinfo, "m4p", "mp4a", "AAC audio file" },
{ "aac", scan_get_nultags, scan_get_aacinfo, "m4a", "mp4a", "AAC audio file" },
{ "mp4", scan_get_nultags, scan_get_aacinfo, "m4a", "mp4a", "AAC audio file" },
{ "m4a", scan_get_nultags, scan_get_aacinfo, "m4a", "mp4a", "AAC audio file" },
{ "m4p", scan_get_nultags, scan_get_aacinfo, "m4p", "mp4a", "AAC audio file" },
{ "mp3", scan_get_mp3tags, scan_get_mp3fileinfo, "mp3", "mpeg", "MPEG audio file" },
{ "wav", scan_get_nultags, scan_get_wavfileinfo, "wav", "wav", "WAV audio file" },
{ "wma", scan_get_nultags, scan_get_wmainfo, "wma", "wma", "WMA audio file" },
@ -425,21 +431,6 @@ void scan_process_playlistlist(void) {
/**
* 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;
gettimeofday(&tv, &tz);
return (t - (365L * 66L * 24L * 60L * 60L + 17L * 60L * 60L * 24L) +
(tz.tz_minuteswest * 60));
}
/*
* scan_init
*
@ -741,154 +732,6 @@ void scan_music_file(char *path, struct dirent *pde, struct stat *psb) {
scan_freetags(&mp3file);
}
/*
* scan_aac_findatom
*
* Find an AAC atom
*/
long scan_aac_findatom(FILE *fin, long max_offset, char *which_atom, int *atom_size) {
long current_offset=0;
int size;
char atom[4];
while(current_offset < max_offset) {
if(fread((void*)&size,1,sizeof(int),fin) != sizeof(int))
return -1;
size=ntohl(size);
if(size <= 7) /* something not right */
return -1;
if(fread(atom,1,4,fin) != 4)
return -1;
if(strncasecmp(atom,which_atom,4) == 0) {
*atom_size=size;
return current_offset;
}
fseek(fin,size-8,SEEK_CUR);
current_offset+=size;
}
return -1;
}
/*
* scan_get_aactags
*
* Get tags from an AAC (m4a) file
*/
int scan_get_aactags(char *file, MP3FILE *pmp3) {
FILE *fin;
long atom_offset;
int atom_length;
long current_offset=0;
int current_size;
char current_atom[4];
char *current_data;
unsigned short us_data;
int genre;
int len;
if(!(fin=fopen(file,"rb"))) {
DPRINTF(E_INF,L_SCAN,"Cannot open file %s for reading\n",file);
return -1;
}
fseek(fin,0,SEEK_SET);
atom_offset = aac_drilltoatom(fin, "moov:udta:meta:ilst", &atom_length);
if(atom_offset != -1) {
/* found the tag section - need to walk through now */
while(current_offset < atom_length) {
if(fread((void*)&current_size,1,sizeof(int),fin) != sizeof(int))
break;
current_size=ntohl(current_size);
if(current_size <= 7) /* something not right */
break;
if(fread(current_atom,1,4,fin) != 4)
break;
len=current_size-7; /* for ill-formed too-short tags */
if(len < 22)
len=22;
current_data=(char*)malloc(len); /* extra byte */
memset(current_data,0x00,len);
if(fread(current_data,1,current_size-8,fin) != current_size-8)
break;
if(!memcmp(current_atom,"\xA9" "nam",4)) { /* Song name */
pmp3->title=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "ART",4)) {
pmp3->artist=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "alb",4)) {
pmp3->album=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "cmt",4)) {
pmp3->comment=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "wrt",4)) {
pmp3->composer=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "grp",4)) {
pmp3->grouping=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "gen",4)) {
/* can this be a winamp genre??? */
pmp3->genre=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"tmpo",4)) {
us_data=*((unsigned short *)&current_data[16]);
us_data=ntohs(us_data);
pmp3->bpm=us_data;
} else if(!memcmp(current_atom,"trkn",4)) {
us_data=*((unsigned short *)&current_data[18]);
us_data=ntohs(us_data);
pmp3->track=us_data;
us_data=*((unsigned short *)&current_data[20]);
us_data=ntohs(us_data);
pmp3->total_tracks=us_data;
} else if(!memcmp(current_atom,"disk",4)) {
us_data=*((unsigned short *)&current_data[18]);
us_data=ntohs(us_data);
pmp3->disc=us_data;
us_data=*((unsigned short *)&current_data[20]);
us_data=ntohs(us_data);
pmp3->total_discs=us_data;
} else if(!memcmp(current_atom,"\xA9" "day",4)) {
pmp3->year=atoi((char*)&current_data[16]);
} else if(!memcmp(current_atom,"gnre",4)) {
genre=(int)(*((char*)&current_data[17]));
genre--;
if((genre < 0) || (genre > WINAMP_GENRE_UNKNOWN))
genre=WINAMP_GENRE_UNKNOWN;
pmp3->genre=strdup(scan_winamp_genre[genre]);
} else if (!memcmp(current_atom, "cpil", 4)) {
pmp3->compilation = current_data[16];
}
free(current_data);
current_offset+=current_size;
}
}
fclose(fin);
return 0; /* we'll return as much as we got. */
}
/**
* fetch the taghandler for this file type
*/
@ -1195,67 +1038,6 @@ int scan_get_fileinfo(char *file, MP3FILE *pmp3) {
return 0;
}
/*
* aac_drilltoatom
*
* Returns the offset of the atom specified by the given path or -1 if
* not found. atom_path is a colon separated list of atoms specifying
* a path from parent node to the target node. All paths must be specified
* from the root.
*/
off_t aac_drilltoatom(FILE *aac_fp, char *atom_path, unsigned int *atom_length)
{
long atom_offset;
off_t file_size;
char *cur_p, *end_p;
char atom_name[5];
fseek(aac_fp, 0, SEEK_END);
file_size = ftell(aac_fp);
rewind(aac_fp);
end_p = atom_path;
while (*end_p != '\0')
{
end_p++;
}
atom_name[4] = '\0';
cur_p = atom_path;
while (cur_p != NULL)
{
if ((end_p - cur_p) < 4)
{
return -1;
}
strncpy(atom_name, cur_p, 4);
atom_offset = scan_aac_findatom(aac_fp, file_size, atom_name, atom_length);
if (atom_offset == -1)
{
return -1;
}
DPRINTF(E_DBG,L_SCAN,"Found %s atom at off %ld.\n", atom_name, ftell(aac_fp) - 8);
cur_p = strchr(cur_p, ':');
if (cur_p != NULL)
{
cur_p++;
/* PENDING: Hack to deal with atoms that have extra data in addition
to having child atoms. This should be dealt in a better fashion
than this (table with skip offsets or an actual real mp4 parser.) */
if (!strcmp(atom_name, "meta")) {
fseek(aac_fp, 4, SEEK_CUR);
} else if (!strcmp(atom_name, "stsd")) {
fseek(aac_fp, 8, SEEK_CUR);
} else if (!strcmp(atom_name, "mp4a")) {
fseek(aac_fp, 28, SEEK_CUR);
}
}
}
return ftell(aac_fp) - 8;
}
/*
* scan_get_urlfileinfo
*
@ -1309,139 +1091,6 @@ int scan_get_urlfileinfo(char *file, MP3FILE *pmp3) {
return 0;
}
/*
* scan_get_aacfileinfo
*
* Get info from the actual aac headers
*/
int scan_get_aacfileinfo(char *file, MP3FILE *pmp3) {
FILE *infile;
long atom_offset;
int atom_length;
int sample_size;
int samples;
unsigned int bit_rate;
off_t file_size;
int ms;
unsigned char buffer[2];
int time = 0;
DPRINTF(E_DBG,L_SCAN,"Getting AAC file info\n");
if(!(infile=fopen(file,"rb"))) {
DPRINTF(E_WARN,L_SCAN,"Could not open %s for reading\n",file);
return -1;
}
fseek(infile,0,SEEK_END);
file_size=ftell(infile);
fseek(infile,0,SEEK_SET);
pmp3->file_size=file_size;
/* now, hunt for the mvhd atom */
atom_offset = aac_drilltoatom(infile, "moov:mvhd", &atom_length);
if(atom_offset != -1) {
fseek(infile, 4, SEEK_CUR);
fread((void *)&time, sizeof(int), 1, infile);
time = ntohl(time);
pmp3->time_added = mac_to_unix_time(time);
fread((void *)&time, sizeof(int), 1, infile);
time = ntohl(time);
pmp3->time_modified = mac_to_unix_time(time);
fread((void*)&sample_size,1,sizeof(int),infile);
fread((void*)&samples,1,sizeof(int),infile);
sample_size=ntohl(sample_size);
samples=ntohl(samples);
/* avoid overflowing on large sample_sizes (90000) */
ms=1000;
while((ms > 9) && (!(sample_size % 10))) {
sample_size /= 10;
ms /= 10;
}
/* DWB: use ms time instead of sec */
pmp3->song_length=(int)((samples * ms) / sample_size);
DPRINTF(E_DBG,L_SCAN,"Song length: %d seconds\n", pmp3->song_length / 1000);
}
pmp3->bitrate = 0;
/* see if it is aac or alac */
atom_offset = aac_drilltoatom(infile, "moov:trak:mdia:minf:stbl:stsd:alac", &atom_length);
if(atom_offset != -1) {
/* should we still pull samplerate, etc from the this atom? */
if(pmp3->codectype) {
free(pmp3->codectype);
}
pmp3->codectype=strdup("alac");
}
/* Get the sample rate from the 'mp4a' atom (timescale). This is also
found in the 'mdhd' atom which is a bit closer but we need to
navigate to the 'mp4a' atom anyways to get to the 'esds' atom. */
atom_offset = aac_drilltoatom(infile, "moov:trak:mdia:minf:stbl:stsd:mp4a", &atom_length);
if (atom_offset != -1) {
fseek(infile, atom_offset + 32, SEEK_SET);
/* Timescale here seems to be 2 bytes here (the 2 bytes before it are
"reserved") though the timescale in the 'mdhd' atom is 4. Not sure how
this is dealt with when sample rate goes higher than 64K. */
fread(buffer, sizeof(unsigned char), 2, infile);
pmp3->samplerate = (buffer[0] << 8) | (buffer[1]);
/* Seek to end of atom. */
fseek(infile, 2, SEEK_CUR);
/* Get the bit rate from the 'esds' atom. We are already positioned
in the parent atom so just scan ahead. */
atom_offset = scan_aac_findatom(infile, atom_length - (ftell(infile) - atom_offset), "esds", &atom_length);
if (atom_offset != -1) {
fseek(infile, atom_offset + 22, SEEK_CUR);
fread((void *)&bit_rate, sizeof(unsigned int), 1, infile);
pmp3->bitrate = ntohl(bit_rate) / 1000;
DPRINTF(E_DBG,L_SCAN,"esds bitrate: %d\n",pmp3->bitrate);
if(pmp3->bitrate > 320) {
DPRINTF(E_LOG,L_SCAN,"Capping AAC bitrate. Please report this "
"message to the forums on www.mt-daapd.org. Thx.\n");
pmp3->bitrate = 320;
}
} else {
DPRINTF(E_DBG,L_SCAN, "Could not find 'esds' atom to determine bit rate.\n");
}
} else {
DPRINTF(E_DBG,L_SCAN, "Could not find 'mp4a' atom to determine sample rate.\n");
}
/* Fallback if we can't find the info in the atoms. */
if (pmp3->bitrate == 0) {
/* calculate bitrate from song length... Kinda cheesy */
DPRINTF(E_DBG,L_SCAN, "Could not find 'esds' atom. Calculating bit rate.\n");
atom_offset=aac_drilltoatom(infile,"mdat",&atom_length);
if ((atom_offset != -1) && (pmp3->song_length)) {
pmp3->bitrate = atom_length / ((pmp3->song_length / 1000) * 128);
}
}
fclose(infile);
return 0;
}
#define GET_WAV_INT32(p) ((((unsigned long)((p)[3])) << 24) | \
(((unsigned long)((p)[2])) << 16) | \
(((unsigned long)((p)[1])) << 8) | \

6
src/mp3-scanner.h
View File

@ -88,10 +88,10 @@ typedef struct tag_m3ufile {
#define PL_STATICFILE 2
#define PL_STATICXML 3
#define WINAMP_GENRE_UNKNOWN 148
extern char *scan_winamp_genre[];
extern int scan_init(char *path);
extern void make_composite_tags(MP3FILE *song);
/* FIXME: this should be refactored out of here... */
extern off_t aac_drilltoatom(FILE *aac_fp, char *atom_path, unsigned int *atom_length);
extern long scan_aac_findatom(FILE *fin, long max_offset, char *which_atom, int *atom_size);
#endif /* _MP3_SCANNER_H_ */

378
src/scan-aac.c Normal file
View File

@ -0,0 +1,378 @@
/*
* $Id$
*
* Copyright (C) 2003 Ron Pedde (ron@pedde.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/time.h>
#include "err.h"
#include "mp3-scanner.h"
#include "scan-aac.h"
/* Forwards */
static time_t scan_aac_mac_to_unix_time(int t);
/**
* Convert mac time to unix time (different epochs)
*
* @param t time since mac epoch
* @returns time since unix epoch
*/
time_t scan_aac_mac_to_unix_time(int t) {
struct timeval tv;
struct timezone tz;
gettimeofday(&tv, &tz);
return (t - (365L * 66L * 24L * 60L * 60L + 17L * 60L * 60L * 24L) +
(tz.tz_minuteswest * 60));
}
/**
* Returns the offset of the atom specified by the given path or -1 if
* not found. atom_path is a colon separated list of atoms specifying
* a path from parent node to the target node. All paths must be specified
* from the root.
*
* @param aac_fp the aac file being searched
* @param atom_path the colon separated list of atoms
* @param atom_length the size of the atom "drilled to"
* @returns offset of the atom, or -1 if unsuccessful
*/
off_t scan_aac_drilltoatom(FILE *aac_fp,char *atom_path,
unsigned int *atom_length) {
long atom_offset;
off_t file_size;
char *cur_p, *end_p;
char atom_name[5];
fseek(aac_fp, 0, SEEK_END);
file_size = ftell(aac_fp);
rewind(aac_fp);
end_p = atom_path;
while (*end_p != '\0') {
end_p++;
}
atom_name[4] = '\0';
cur_p = atom_path;
while (cur_p != NULL) {
if ((end_p - cur_p) < 4) {
return -1;
}
strncpy(atom_name, cur_p, 4);
atom_offset = scan_aac_findatom(aac_fp, file_size,
atom_name, atom_length);
if (atom_offset == -1) {
return -1;
}
DPRINTF(E_SPAM,L_SCAN,"Found %s atom at off %ld.\n",
atom_name, ftell(aac_fp) - 8);
cur_p = strchr(cur_p, ':');
if (cur_p != NULL) {
cur_p++;
/* FIXME
* Hack to deal with atoms that have extra data in addition
* to having child atoms. This should be dealt in a better fashion
* than this (table with skip offsets or a real mp4 parser.) */
if (!strcmp(atom_name, "meta")) {
fseek(aac_fp, 4, SEEK_CUR);
} else if (!strcmp(atom_name, "stsd")) {
fseek(aac_fp, 8, SEEK_CUR);
} else if (!strcmp(atom_name, "mp4a")) {
fseek(aac_fp, 28, SEEK_CUR);
}
}
}
return ftell(aac_fp) - 8;
}
/**
* Given a file, search for a particular aac atom.
*
* @param fin file handle of the open aac file
* @param max_offset how far to search (probably size of container atom)
* @param which_atom what atom name we are searching for
* @param atom_size this will hold the size of the atom found
*/
long scan_aac_findatom(FILE *fin, long max_offset,
char *which_atom, unsigned int *atom_size) {
long current_offset=0;
int size;
char atom[4];
while(current_offset < max_offset) {
if(fread((void*)&size,1,sizeof(int),fin) != sizeof(int))
return -1;
size=ntohl(size);
if(size <= 7) /* something not right */
return -1;
if(fread(atom,1,4,fin) != 4)
return -1;
if(strncasecmp(atom,which_atom,4) == 0) {
*atom_size=size;
return current_offset;
}
fseek(fin,size-8,SEEK_CUR);
current_offset+=size;
}
return -1;
}
/**
* main aac scanning routing.
*
* @param filename file to scan
* @param pmp3 pointer to the MP3FILE to fill with data
* @returns -1 if file should not be added to database, 0 otherwise
*/
int scan_get_aacinfo(char *filename, MP3FILE *pmp3) {
FILE *fin;
long atom_offset;
unsigned int atom_length;
long current_offset=0;
int current_size;
char current_atom[4];
char *current_data;
unsigned short us_data;
int genre;
int len;
int sample_size;
int samples;
unsigned int bit_rate;
int ms;
unsigned char buffer[2];
int time = 0;
if(!(fin=fopen(filename,"rb"))) {
DPRINTF(E_INF,L_SCAN,"Cannot open file %s for reading\n",filename);
return -1;
}
fseek(fin,0,SEEK_END);
pmp3->file_size = ftell(fin);
fseek(fin,0,SEEK_SET);
atom_offset=scan_aac_drilltoatom(fin, "moov:udta:meta:ilst", &atom_length);
if(atom_offset != -1) {
/* found the tag section - need to walk through now */
while(current_offset < atom_length) {
if(fread((void*)&current_size,1,sizeof(int),fin) != sizeof(int))
break;
current_size=ntohl(current_size);
if(current_size <= 7) /* something not right */
break;
if(fread(current_atom,1,4,fin) != 4)
break;
len=current_size-7; /* for ill-formed too-short tags */
if(len < 22)
len=22;
current_data=(char*)malloc(len); /* extra byte */
memset(current_data,0x00,len);
if(fread(current_data,1,current_size-8,fin) != current_size-8)
break;
if(!memcmp(current_atom,"\xA9" "nam",4)) { /* Song name */
pmp3->title=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "ART",4)) {
pmp3->artist=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "alb",4)) {
pmp3->album=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "cmt",4)) {
pmp3->comment=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "wrt",4)) {
pmp3->composer=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "grp",4)) {
pmp3->grouping=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"\xA9" "gen",4)) {
/* can this be a winamp genre??? */
pmp3->genre=strdup((char*)&current_data[16]);
} else if(!memcmp(current_atom,"tmpo",4)) {
us_data=*((unsigned short *)&current_data[16]);
us_data=ntohs(us_data);
pmp3->bpm=us_data;
} else if(!memcmp(current_atom,"trkn",4)) {
us_data=*((unsigned short *)&current_data[18]);
us_data=ntohs(us_data);
pmp3->track=us_data;
us_data=*((unsigned short *)&current_data[20]);
us_data=ntohs(us_data);
pmp3->total_tracks=us_data;
} else if(!memcmp(current_atom,"disk",4)) {
us_data=*((unsigned short *)&current_data[18]);
us_data=ntohs(us_data);
pmp3->disc=us_data;
us_data=*((unsigned short *)&current_data[20]);
us_data=ntohs(us_data);
pmp3->total_discs=us_data;
} else if(!memcmp(current_atom,"\xA9" "day",4)) {
pmp3->year=atoi((char*)&current_data[16]);
} else if(!memcmp(current_atom,"gnre",4)) {
genre=(int)(*((char*)&current_data[17]));
genre--;
if((genre < 0) || (genre > WINAMP_GENRE_UNKNOWN))
genre=WINAMP_GENRE_UNKNOWN;
pmp3->genre=strdup(scan_winamp_genre[genre]);
} else if (!memcmp(current_atom, "cpil", 4)) {
pmp3->compilation = current_data[16];
}
free(current_data);
current_offset+=current_size;
}
}
/* got the tag info, now let's get bitrate, etc */
atom_offset = scan_aac_drilltoatom(fin, "moov:mvhd", &atom_length);
if(atom_offset != -1) {
fseek(fin, 4, SEEK_CUR);
fread((void *)&time, sizeof(int), 1, fin);
time = ntohl(time);
pmp3->time_added = scan_aac_mac_to_unix_time(time);
fread((void *)&time, sizeof(int), 1, fin);
time = ntohl(time);
pmp3->time_modified = scan_aac_mac_to_unix_time(time);
fread((void*)&sample_size,1,sizeof(int),fin);
fread((void*)&samples,1,sizeof(int),fin);
sample_size=ntohl(sample_size);
samples=ntohl(samples);
/* avoid overflowing on large sample_sizes (90000) */
ms=1000;
while((ms > 9) && (!(sample_size % 10))) {
sample_size /= 10;
ms /= 10;
}
/* DWB: use ms time instead of sec */
pmp3->song_length=(int)((samples * ms) / sample_size);
DPRINTF(E_DBG,L_SCAN,"Song length: %d seconds\n",
pmp3->song_length / 1000);
}
pmp3->bitrate = 0;
/* see if it is aac or alac */
atom_offset = scan_aac_drilltoatom(fin,
"moov:trak:mdia:minf:stbl:stsd:alac",
&atom_length);
if(atom_offset != -1) {
/* should we still pull samplerate, etc from the this atom? */
if(pmp3->codectype) {
free(pmp3->codectype);
}
pmp3->codectype=strdup("alac");
}
/* Get the sample rate from the 'mp4a' atom (timescale). This is also
found in the 'mdhd' atom which is a bit closer but we need to
navigate to the 'mp4a' atom anyways to get to the 'esds' atom. */
atom_offset=scan_aac_drilltoatom(fin,
"moov:trak:mdia:minf:stbl:stsd:mp4a",
&atom_length);
if (atom_offset != -1) {
fseek(fin, atom_offset + 32, SEEK_SET);
/* Timescale here seems to be 2 bytes here (the 2 bytes before it are
* "reserved") though the timescale in the 'mdhd' atom is 4. Not sure
* how this is dealt with when sample rate goes higher than 64K. */
fread(buffer, sizeof(unsigned char), 2, fin);
pmp3->samplerate = (buffer[0] << 8) | (buffer[1]);
/* Seek to end of atom. */
fseek(fin, 2, SEEK_CUR);
/* Get the bit rate from the 'esds' atom. We are already positioned
in the parent atom so just scan ahead. */
atom_offset = scan_aac_findatom(fin,
atom_length-(ftell(fin)-atom_offset),
"esds", &atom_length);
if (atom_offset != -1) {
/* Roku Soundbridge seems to believe anything above 320K is
* an ALAC encoded m4a. We'll lie on their behalf.
*/
fseek(fin, atom_offset + 22, SEEK_CUR);
fread((void *)&bit_rate, sizeof(unsigned int), 1, fin);
pmp3->bitrate = ntohl(bit_rate) / 1000;
DPRINTF(E_DBG,L_SCAN,"esds bitrate: %d\n",pmp3->bitrate);
if(pmp3->bitrate > 320) {
pmp3->bitrate = 320;
}
} else {
DPRINTF(E_DBG,L_SCAN, "Couldn't find 'esds' atom for bit rate.\n");
}
} else {
DPRINTF(E_DBG,L_SCAN, "Couldn't find 'mp4a' atom for sample rate.\n");
}
/* Fallback if we can't find the info in the atoms. */
if (pmp3->bitrate == 0) {
/* calculate bitrate from song length... Kinda cheesy */
DPRINTF(E_DBG,L_SCAN, "Guesstimating bit rate.\n");
atom_offset=scan_aac_drilltoatom(fin,"mdat",&atom_length);
if ((atom_offset != -1) && (pmp3->song_length)) {
pmp3->bitrate = atom_length / ((pmp3->song_length / 1000) * 128);
}
}
fclose(fin);
return 0; /* we'll return as much as we got. */
}

27
src/scan-aac.h Normal file
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@ -0,0 +1,27 @@
/*
* $Id$
*
* Copyright (C) 2003 Ron Pedde (ron@pedde.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _SCAN_AAC_H_
#define _SCAN_AAC_H_
extern off_t scan_aac_drilltoatom(FILE *aac_fp, char *atom_path, unsigned int *atom_length);
extern long scan_aac_findatom(FILE *fin, long max_offset, char *which_atom, unsigned int *atom_size);
#endif

0
src/flac.c → src/scan-flac.c
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0
src/ogg.c → src/scan-ogg.c
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0
src/wma.c → src/scan-wma.c
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