/* * $Id$ * * 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 #include #include #include #include #include #include #include #include "daapd.h" #include "err.h" #include "mp3-scanner.h" /** * Struct to keep info about the information gleaned from * the mp3 frame header. */ typedef struct tag_scan_frameinfo { 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; /**< 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 */ int frame_offset; /**< Where this frame was found */ double version; /**< MPEG version (e.g. 2.0, 2.5, 1.0) */ int is_valid; } SCAN_FRAMEINFO; typedef struct tag_scan_id3header { unsigned char id[3]; unsigned char version[2]; unsigned char flags; unsigned char size[4]; } __attribute((packed)) SCAN_ID3HEADER; /* * Globals */ int scan_br_table[5][16] = { { 0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0 }, /* MPEG1, Layer 1 */ { 0,32,48,56,64,80,96,112,128,160,192,224,256,320,384,0 }, /* MPEG1, Layer 2 */ { 0,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0 }, /* MPEG1, Layer 3 */ { 0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,0 }, /* MPEG2/2.5, Layer 1 */ { 0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0 } /* MPEG2/2.5, Layer 2/3 */ }; int scan_sample_table[3][4] = { { 44100, 48000, 32000, 0 }, /* MPEG 1 */ { 22050, 24000, 16000, 0 }, /* MPEG 2 */ { 11025, 12000, 8000, 0 } /* MPEG 2.5 */ }; char *scan_winamp_genre[] = { "Blues", // 0 "Classic Rock", "Country", "Dance", "Disco", "Funk", // 5 "Grunge", "Hip-Hop", "Jazz", "Metal", "New Age", // 10 "Oldies", "Other", "Pop", "R&B", "Rap", // 15 "Reggae", "Rock", "Techno", "Industrial", "Alternative", // 20 "Ska", "Death Metal", "Pranks", "Soundtrack", "Euro-Techno", // 25 "Ambient", "Trip-Hop", "Vocal", "Jazz+Funk", "Fusion", // 30 "Trance", "Classical", "Instrumental", "Acid", "House", // 35 "Game", "Sound Clip", "Gospel", "Noise", "AlternRock", // 40 "Bass", "Soul", "Punk", "Space", "Meditative", // 45 "Instrumental Pop", "Instrumental Rock", "Ethnic", "Gothic", "Darkwave", // 50 "Techno-Industrial", "Electronic", "Pop-Folk", "Eurodance", "Dream", // 55 "Southern Rock", "Comedy", "Cult", "Gangsta", "Top 40", // 60 "Christian Rap", "Pop/Funk", "Jungle", "Native American", "Cabaret", // 65 "New Wave", "Psychadelic", "Rave", "Showtunes", "Trailer", // 70 "Lo-Fi", "Tribal", "Acid Punk", "Acid Jazz", "Polka", // 75 "Retro", "Musical", "Rock & Roll", "Hard Rock", "Folk", // 80 "Folk/Rock", "National folk", "Swing", "Fast-fusion", "Bebob", // 85 "Latin", "Revival", "Celtic", "Bluegrass", "Avantgarde", // 90 "Gothic Rock", "Progressive Rock", "Psychedelic Rock", "Symphonic Rock", "Slow Rock", // 95 "Big Band", "Chorus", "Easy Listening", "Acoustic", "Humour", // 100 "Speech", "Chanson", "Opera", "Chamber Music", "Sonata", // 105 "Symphony", "Booty Bass", "Primus", "Porn Groove", "Satire", // 110 "Slow Jam", "Club", "Tango", "Samba", "Folklore", // 115 "Ballad", "Powder Ballad", "Rhythmic Soul", "Freestyle", "Duet", // 120 "Punk Rock", "Drum Solo", "A Capella", "Euro-House", "Dance Hall", // 125 "Goa", "Drum & Bass", "Club House", "Hardcore", "Terror", // 130 "Indie", "BritPop", "NegerPunk", "Polsk Punk", "Beat", // 135 "Christian Gangsta", "Heavy Metal", "Black Metal", "Crossover", "Contemporary C", // 140 "Christian Rock", "Merengue", "Salsa", "Thrash Metal", "Anime", // 145 "JPop", "SynthPop", "Unknown" }; /* Forwards */ static int scan_mp3_get_mp3tags(char *file, MP3FILE *pmp3); static int scan_mp3_get_mp3fileinfo(char *file, MP3FILE *pmp3); static int scan_mp3_decode_mp3_frame(unsigned char *frame,SCAN_FRAMEINFO *pfi); static void scan_mp3_get_average_bitrate(FILE *infile, SCAN_FRAMEINFO *pfi); static int scan_mp3_is_numeric(char *str); static void scan_mp3_get_frame_count(FILE *infile, SCAN_FRAMEINFO *pfi); /** * main entrypoint for the scanner * * @param filename file to scan * @param pmp3 MP3FILE structure to fill */ int scan_get_mp3info(char *filename, MP3FILE *pmp3) { if(!scan_mp3_get_mp3tags(filename, pmp3)) return scan_mp3_get_mp3fileinfo(filename,pmp3); return -1; } /** * decide if a string is numeric or not... * * @param str string to evaluate * @returns 1 if number, 0 otherwise */ int scan_mp3_is_numeric(char *str) { char *ptr=str; while(*ptr) { if(!isdigit(*ptr)) return 0; ptr++; } return 1; } int scan_mp3_get_mp3tags(char *file, MP3FILE *pmp3) { struct id3_file *pid3file; struct id3_tag *pid3tag; struct id3_frame *pid3frame; int err; int index; int used; char *utf8_text; int genre=WINAMP_GENRE_UNKNOWN; int have_utf8; int have_text; id3_ucs4_t const *native_text; char *tmp; int got_numeric_genre; pid3file=id3_file_open(file,ID3_FILE_MODE_READONLY); if(!pid3file) { DPRINTF(E_WARN,L_SCAN,"Cannot open %s\n",file); return -1; } pid3tag=id3_file_tag(pid3file); if(!pid3tag) { err=errno; id3_file_close(pid3file); errno=err; DPRINTF(E_WARN,L_SCAN,"Cannot get ID3 tag for %s\n",file); return -1; } index=0; while((pid3frame=id3_tag_findframe(pid3tag,"",index))) { used=0; utf8_text=NULL; native_text=NULL; have_utf8=0; have_text=0; if(!strcmp(pid3frame->id,"YTCP")) { /* for id3v2.2 */ pmp3->compilation = 1; DPRINTF(E_DBG,L_SCAN,"Compilation: %d\n", pmp3->compilation); } if(((pid3frame->id[0] == 'T')||(strcmp(pid3frame->id,"COMM")==0)) && (id3_field_getnstrings(&pid3frame->fields[1]))) have_text=1; if(have_text) { native_text=id3_field_getstrings(&pid3frame->fields[1],0); if(native_text) { /* FIXME: I didn't understand what was happening here. * this should really be a switch to evaluate latin1 * tags as native codepage. Not only is this hackish, * it's just plain wrong. */ have_utf8=1; if(config.latin1_tags) { utf8_text=(char *)id3_ucs4_latin1duplicate(native_text); } else { utf8_text=(char *)id3_ucs4_utf8duplicate(native_text); } MEMNOTIFY(utf8_text); if(!strcmp(pid3frame->id,"TIT2")) { /* Title */ used=1; pmp3->title = utf8_text; DPRINTF(E_DBG,L_SCAN," Title: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TPE1")) { used=1; pmp3->artist = utf8_text; DPRINTF(E_DBG,L_SCAN," Artist: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TALB")) { used=1; pmp3->album = utf8_text; DPRINTF(E_DBG,L_SCAN," Album: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TCOM")) { used=1; pmp3->composer = utf8_text; DPRINTF(E_DBG,L_SCAN," Composer: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TIT1")) { used=1; pmp3->grouping = utf8_text; DPRINTF(E_DBG,L_SCAN," Grouping: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TPE2")) { used=1; pmp3->orchestra = utf8_text; DPRINTF(E_DBG,L_SCAN," Orchestra: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TPE3")) { used=1; pmp3->conductor = utf8_text; DPRINTF(E_DBG,L_SCAN," Conductor: %s\n",utf8_text); } else if(!strcmp(pid3frame->id,"TCON")) { used=1; pmp3->genre = utf8_text; got_numeric_genre=0; DPRINTF(E_DBG,L_SCAN," Genre: %s\n",utf8_text); if(pmp3->genre) { if(!strlen(pmp3->genre)) { genre=WINAMP_GENRE_UNKNOWN; got_numeric_genre=1; } else if (scan_mp3_is_numeric(pmp3->genre)) { genre=atoi(pmp3->genre); got_numeric_genre=1; } else if ((pmp3->genre[0] == '(') && (isdigit(pmp3->genre[1]))) { genre=atoi((char*)&pmp3->genre[1]); got_numeric_genre=1; } if(got_numeric_genre) { if((genre < 0) || (genre > WINAMP_GENRE_UNKNOWN)) genre=WINAMP_GENRE_UNKNOWN; free(pmp3->genre); pmp3->genre=strdup(scan_winamp_genre[genre]); } } } else if(!strcmp(pid3frame->id,"COMM")) { used=1; pmp3->comment = utf8_text; DPRINTF(E_DBG,L_SCAN," Comment: %s\n",pmp3->comment); } else if(!strcmp(pid3frame->id,"TPOS")) { tmp=utf8_text; strsep(&tmp,"/"); if(tmp) { pmp3->total_discs=atoi(tmp); } pmp3->disc=atoi(utf8_text); DPRINTF(E_DBG,L_SCAN," Disc %d of %d\n",pmp3->disc,pmp3->total_discs); } else if(!strcmp(pid3frame->id,"TRCK")) { tmp=utf8_text; strsep(&tmp,"/"); if(tmp) { pmp3->total_tracks=atoi(tmp); } pmp3->track=atoi(utf8_text); DPRINTF(E_DBG,L_SCAN," Track %d of %d\n",pmp3->track,pmp3->total_tracks); } else if(!strcmp(pid3frame->id,"TDRC")) { pmp3->year = atoi(utf8_text); DPRINTF(E_DBG,L_SCAN," Year: %d\n",pmp3->year); } else if(!strcmp(pid3frame->id,"TLEN")) { pmp3->song_length = atoi(utf8_text); /* now in ms */ DPRINTF(E_DBG,L_SCAN," Length: %d\n", pmp3->song_length); } else if(!strcmp(pid3frame->id,"TBPM")) { pmp3->bpm = atoi(utf8_text); DPRINTF(E_DBG,L_SCAN,"BPM: %d\n", pmp3->bpm); } else if(!strcmp(pid3frame->id,"TCMP")) { /* for id3v2.3 */ pmp3->compilation = (char)atoi(utf8_text); DPRINTF(E_DBG,L_SCAN,"Compilation: %d\n", pmp3->compilation); } } } /* can check for non-text tags here */ if((!used) && (have_utf8) && (utf8_text)) free(utf8_text); /* v2 COMM tags are a bit different than v1 */ if((!strcmp(pid3frame->id,"COMM")) && (pid3frame->nfields == 4)) { /* Make sure it isn't a application-specific comment... * This currently includes the following: * * iTunes_CDDB_IDs * iTunNORM * * If other apps stuff crap into comment fields, then we'll ignore them * here. */ native_text=id3_field_getstring(&pid3frame->fields[2]); if(native_text) { utf8_text=(char*)id3_ucs4_utf8duplicate(native_text); if((utf8_text) && (strncasecmp(utf8_text,"iTun",4) != 0)) { /* it's a real comment */ if(utf8_text) free(utf8_text); native_text=id3_field_getfullstring(&pid3frame->fields[3]); if(native_text) { if(pmp3->comment) free(pmp3->comment); utf8_text=(char*)id3_ucs4_utf8duplicate(native_text); if(utf8_text) { pmp3->comment=utf8_text; MEMNOTIFY(pmp3->comment); } } } else { if(utf8_text) free(utf8_text); } } } index++; } id3_file_close(pid3file); DPRINTF(E_DBG,L_SCAN,"Got id3 tag successfully\n"); return 0; } /** * Decode an mp3 frame header. Determine layer, bitrate, * samplerate, etc, and fill in the passed structure. * * @param frame 4 byte mp3 frame header * @param pfi pointer to an allocated SCAN_FRAMEINFO struct * @return 0 on success (valid frame), -1 otherwise */ int scan_mp3_decode_mp3_frame(unsigned char *frame, SCAN_FRAMEINFO *pfi) { int ver; int layer_index; int sample_index; int bitrate_index; int samplerate_index; if((frame[0] != 0xFF) || (frame[1] < 224)) { pfi->is_valid=0; return -1; } ver=(frame[1] & 0x18) >> 3; pfi->layer = 4 - ((frame[1] & 0x6) >> 1); layer_index=-1; sample_index=-1; switch(ver) { case 0: pfi->version = 2.5; sample_index=2; if(pfi->layer == 1) layer_index = 3; if((pfi->layer == 2) || (pfi->layer == 3)) layer_index = 4; break; case 2: pfi->version = 2.0; sample_index=1; if(pfi->layer == 1) layer_index=3; if((pfi->layer == 2) || (pfi->layer == 3)) layer_index=4; break; case 3: pfi->version = 1.0; sample_index=0; if(pfi->layer == 1) layer_index = 0; if(pfi->layer == 2) layer_index = 1; if(pfi->layer == 3) layer_index = 2; break; } if((layer_index < 0) || (layer_index > 4)) { pfi->is_valid=0; return -1; } if((sample_index < 0) || (sample_index > 2)) { pfi->is_valid=0; return -1; } if(pfi->layer==1) pfi->samples_per_frame=384; if(pfi->layer==2) pfi->samples_per_frame=1152; if(pfi->layer==3) { if(pfi->version == 1.0) { pfi->samples_per_frame=1152; } else { pfi->samples_per_frame=576; } } bitrate_index=(frame[2] & 0xF0) >> 4; samplerate_index=(frame[2] & 0x0C) >> 2; if((bitrate_index == 0xF) || (bitrate_index==0x0)) { pfi->is_valid=0; return -1; } if(samplerate_index == 3) { pfi->is_valid=0; return -1; } pfi->bitrate = scan_br_table[layer_index][bitrate_index]; pfi->samplerate = scan_sample_table[sample_index][samplerate_index]; if((frame[3] & 0xC0 >> 6) == 3) pfi->stereo = 0; else pfi->stereo = 1; if(frame[2] & 0x02) { /* Padding bit set */ pfi->padding=1; } else { pfi->padding=0; } if(pfi->version == 1.0) { if(pfi->stereo) { pfi->xing_offset=32; } else { pfi->xing_offset=17; } } else { if(pfi->stereo) { pfi->xing_offset=17; } else { pfi->xing_offset=9; } } pfi->crc_protected=(frame[1] & 0xFE); if(pfi->layer == 1) { pfi->frame_length = (12 * pfi->bitrate * 1000 / pfi->samplerate + pfi->padding) * 4; } else { 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 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_mp3_get_average_bitrate(FILE *infile, SCAN_FRAMEINFO *pfi) { off_t file_size; unsigned char frame_buffer[2900]; unsigned char header[4]; int index=0; int found=0; off_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_mp3_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_mp3_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_mp3_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_mp3_get_frame_count(FILE *infile, SCAN_FRAMEINFO *pfi) { int pos; int frames=0; unsigned char frame_buffer[4]; SCAN_FRAMEINFO fi; off_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_SPAM,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_mp3_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_mp3_get_mp3fileinfo(char *file, MP3FILE *pmp3) { FILE *infile; SCAN_ID3HEADER *pid3; SCAN_FRAMEINFO fi; unsigned int size=0; off_t fp_size=0; off_t file_size; unsigned char buffer[1024]; int index; int xing_flags; int found; int first_check=0; 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); pmp3->file_size=file_size; if(fread(buffer,1,sizeof(buffer),infile) != sizeof(buffer)) { if(ferror(infile)) { DPRINTF(E_LOG,L_SCAN,"Error reading: %s\n",strerror(errno)); } else { DPRINTF(E_LOG,L_SCAN,"Short file: %s\n",file); } fclose(infile); return -1; } pid3=(SCAN_ID3HEADER*)buffer; found=0; fp_size=0; if(strncmp((char*)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 read: %s\n",file); fclose(infile); return 0; } index=0; while(!found) { while((buffer[index] != 0xFF) && (index < (sizeof(buffer)-50))) index++; if((first_check) && (index)) { fp_size=0; DPRINTF(E_DBG,L_SCAN,"Bad header... dropping back for full frame search\n"); first_check=0; break; } if(index > sizeof(buffer) - 50) { fp_size += index; DPRINTF(E_DBG,L_SCAN,"Block exhausted\n"); break; } if(!scan_mp3_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_mp3_decode_mp3_frame((u_char*)frame_buffer,&fi)) { found=1; fp_size += index; } } else { DPRINTF(E_LOG,L_SCAN,"Could not read frame header: %s\n",file); fclose(infile); return 0; } if(!found) { DPRINTF(E_DBG,L_SCAN,"Didn't pan out.\n"); } } } 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; fi.frame_offset=fp_size; if(scan_mp3_decode_mp3_frame(&buffer[index],&fi)) { fclose(infile); 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; } 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); DPRINTF(E_DBG,L_SCAN," Bit Rate: %d\n",fi.bitrate); /* now check for an XING header */ if(strncasecmp((char*)&buffer[index+fi.xing_offset+4],"XING",4) == 0) { DPRINTF(E_DBG,L_SCAN,"Found Xing header\n"); xing_flags=*((int*)&buffer[index+fi.xing_offset+4+4]); xing_flags=ntohs(xing_flags); DPRINTF(E_DBG,L_SCAN,"Xing Flags: %02X\n",xing_flags); if(xing_flags & 0x1) { /* Frames field is valid... */ 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_mp3_get_average_bitrate(infile, &fi); } else { /* get full frame count */ scan_mp3_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(!fi.number_of_frames) { /* not vbr */ pmp3->song_length = (int) ((double) file_size * 8. / (double) fi.bitrate); } else { pmp3->song_length = (int) ((double)(fi.number_of_frames*fi.samples_per_frame*1000.)/ (double) fi.samplerate); } } DPRINTF(E_DBG,L_SCAN," Song Length: %d\n",pmp3->song_length); fclose(infile); return 0; }