555 lines
14 KiB
C
555 lines
14 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Daniel Stenberg
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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* Parts of this code has been stolen from the Ample project and was written
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* by David Härdeman.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "file.h"
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#include "types.h"
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#include "id3.h"
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/* Some utility macros used in getsonglength() */
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#define CHECKSYNC(x) (((x >> 21) & 0x07FF) == 0x7FF)
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#define BYTE0(x) ((x >> 24) & 0xFF)
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#define BYTE1(x) ((x >> 16) & 0xFF)
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#define BYTE2(x) ((x >> 8) & 0xFF)
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#define BYTE3(x) ((x >> 0) & 0xFF)
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#define UNSYNC(b1,b2,b3,b4) (((b1 & 0x7F) << (3*7)) + \
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((b2 & 0x7F) << (2*7)) + \
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((b3 & 0x7F) << (1*7)) + \
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((b4 & 0x7F) << (0*7)))
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#define HASID3V2(entry) entry->id3v2len > 0
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#define HASID3V1(entry) entry->id3v1len > 0
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/* Table of bitrates for MP3 files, all values in kilo.
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* Indexed by version, layer and value of bit 15-12 in header.
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*/
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const int bitrate_table[2][3][16] =
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{
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{
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{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,0},
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{0,32,48,56, 64,80, 96, 112,128,160,192,224,256,320,384,0},
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{0,32,40,48, 56,64, 80, 96, 112,128,160,192,224,256,320,0}
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},
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{
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{0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,0},
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{0, 8,16,24,32,40,48, 56, 64, 80, 96,112,128,144,160,0},
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{0, 8,16,24,32,40,48, 56, 64, 80, 96,112,128,144,160,0}
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}
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};
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/* Table of samples per frame for MP3 files.
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* Indexed by layer. Multiplied with 1000.
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*/
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const int bs[4] = {0, 384000, 1152000, 1152000};
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/* Table of sample frequency for MP3 files.
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* Indexed by version and layer.
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*/
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const int freqtab[2][4] =
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{
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{44100, 48000, 32000, 0},
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{22050, 24000, 16000, 0},
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};
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/*
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* Removes trailing spaces from a string.
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*
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* Arguments: buffer - the string to process
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*
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* Returns: void
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*/
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static void
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stripspaces(char *buffer)
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{
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int i = 0;
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while(*(buffer + i) != '\0')
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i++;
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for(;i >= 0; i--) {
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if(*(buffer + i) == ' ')
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*(buffer + i) = '\0';
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else if(*(buffer + i) == '\0')
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continue;
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else
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break;
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}
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}
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/*
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* Sets the title of an MP3 entry based on its ID3v1 tag.
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*
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* Arguments: file - the MP3 file to scen for a ID3v1 tag
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* entry - the entry to set the title in
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*
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* Returns: TRUE if a title was found and created, else FALSE
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*/
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static bool
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setid3v1title(int fd, mp3entry *entry)
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{
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char buffer[31];
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int offsets[3] = {-95,-65,-125};
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int i;
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static char keepit[3][32];
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for(i=0;i<3;i++) {
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if(-1 == lseek(fd, offsets[i], SEEK_END))
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return FALSE;
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buffer[30]=0;
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read(fd, buffer, 30);
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stripspaces(buffer);
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if(buffer[0]) {
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switch(i) {
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case 0:
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strcpy(keepit[0], buffer);
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entry->artist = keepit[0];
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break;
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case 1:
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strcpy(keepit[1], buffer);
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entry->album = keepit[1];
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break;
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case 2:
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strcpy(keepit[2], buffer);
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entry->title = keepit[2];
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break;
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}
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}
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}
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return TRUE;
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}
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/*
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* Sets the title of an MP3 entry based on its ID3v2 tag.
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*
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* Arguments: file - the MP3 file to scen for a ID3v2 tag
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* entry - the entry to set the title in
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*
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* Returns: TRUE if a title was found and created, else FALSE
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*/
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static void
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setid3v2title(int fd, mp3entry *entry)
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{
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unsigned int minframesize;
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int size;
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unsigned int readsize = 0, headerlen;
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char *title = NULL;
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char *artist = NULL;
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char *album = NULL;
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char header[10];
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unsigned short int version;
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static char buffer[512];
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int titlen=0, artistn=0, albumn=0;
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/* 10 = headerlength */
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if(entry->id3v2len < 10)
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return;
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/* Check version */
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lseek(fd, 0, SEEK_SET);
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if(10 != read(fd, header, 10))
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return;
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version = (unsigned short int)header[3];
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/* Read all frames in the tag */
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size = entry->id3v2len - 10;
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if(size >= (int)sizeof(buffer))
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size = sizeof(buffer)-1;
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if(size != read(fd, buffer, size)) {
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free(buffer);
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return;
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}
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*(buffer + size) = '\0';
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/* Set minimun frame size according to ID3v2 version */
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if(version > 2)
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minframesize = 12;
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else
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minframesize = 8;
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/*
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* We must have at least minframesize bytes left for the
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* remaining frames to be interesting
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*/
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while(size - readsize > minframesize) {
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/* Read frame header and check length */
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if(version > 2) {
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memcpy(header, (buffer + readsize), 10);
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readsize += 10;
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headerlen = UNSYNC(header[4], header[5],
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header[6], header[7]);
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} else {
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memcpy(header, (buffer + readsize), 6);
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readsize += 6;
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headerlen = (header[3] << 16) +
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(header[4] << 8) +
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(header[5]);
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}
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if(headerlen < 1)
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continue;
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/* Check for certain frame headers */
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if(!strncmp(header, "TPE1", strlen("TPE1")) ||
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!strncmp(header, "TP1", strlen("TP1"))) {
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readsize++;
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headerlen--;
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if(headerlen > (size - readsize))
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headerlen = (size - readsize);
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artist = buffer + readsize;
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artistn = headerlen;
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readsize += headerlen;
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}
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else if(!strncmp(header, "TIT2", strlen("TIT2")) ||
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!strncmp(header, "TT2", strlen("TT2"))) {
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readsize++;
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headerlen--;
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if(headerlen > (size - readsize))
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headerlen = (size - readsize);
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title = buffer + readsize;
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titlen = headerlen;
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readsize += headerlen;
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}
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else if(!strncmp(header, "TALB", strlen("TALB"))) {
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readsize++;
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headerlen--;
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if(headerlen > (size - readsize))
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headerlen = (size - readsize);
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album = buffer + readsize;
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albumn = headerlen;
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readsize += headerlen;
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}
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}
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if(artist) {
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entry->artist = artist;
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artist[artistn]=0;
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}
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if(title) {
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entry->title = title;
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title[titlen]=0;
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}
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if(album) {
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entry->album = album;
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album[albumn]=0;
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}
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}
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/*
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* Calculates the size of the ID3v2 tag.
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*
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* Arguments: file - the file to search for a tag.
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*
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* Returns: the size of the tag or 0 if none was found
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*/
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static int
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getid3v2len(int fd)
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{
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char buf[6];
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int offset;
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/* Make sure file has a ID3 tag */
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if((-1 == lseek(fd, 0, SEEK_SET)) ||
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(read(fd, buf, 6) != 6) ||
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(strncmp(buf, "ID3", strlen("ID3")) != 0))
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offset = 0;
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/* Now check what the ID3v2 size field says */
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else if(read(fd, buf, 4) != 4)
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offset = 0;
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else
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offset = UNSYNC(buf[0], buf[1], buf[2], buf[3]) + 10;
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return offset;
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}
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static int
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getfilesize(int fd)
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{
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int size;
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/* seek to the end of it */
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size = lseek(fd, 0, SEEK_END);
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if(-1 == size)
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return 0; /* unknown */
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return size;
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}
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/*
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* Calculates the size of the ID3v1 tag.
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*
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* Arguments: file - the file to search for a tag.
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*
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* Returns: the size of the tag or 0 if none was found
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*/
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static int
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getid3v1len(int fd)
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{
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char buf[3];
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int offset;
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/* Check if we find "TAG" 128 bytes from EOF */
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if((lseek(fd, -128, SEEK_END) == -1) ||
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(read(fd, buf, 3) != 3) ||
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(strncmp(buf, "TAG", 3) != 0))
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offset = 0;
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else
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offset = 128;
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return offset;
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}
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/*
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* Calculates the length (in milliseconds) of an MP3 file. Currently this code
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* doesn't care about VBR (Variable BitRate) files since it would have to scan
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* through the entire file but this should become a config option in the
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* future.
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*
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* Modified to only use integers.
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*
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* Arguments: file - the file to calculate the length upon
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* entry - the entry to update with the length
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*
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* Returns: the song length in milliseconds,
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* -1 means that it couldn't be calculated
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*/
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static int
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getsonglength(int fd, mp3entry *entry)
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{
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long header=0;
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int version;
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int layer;
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int bitindex;
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int bitrate;
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int freqindex;
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int frequency;
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long bpf;
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long tpf;
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/* Start searching after ID3v2 header */
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if(-1 == lseek(fd, entry->id3v2len, SEEK_SET))
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return -1;
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/* Fill up header with first 24 bits */
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for(version = 0; version < 3; version++) {
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header <<= 8;
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if(!read(fd, &header, 1))
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return -1;
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}
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/* Loop trough file until we find a frame header */
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restart:
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do {
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header <<= 8;
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if(!read(fd, &header, 1))
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return -1;
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} while(!CHECKSYNC(header));
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/*
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* Some files are filled with garbage in the beginning,
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* if the bitrate index of the header is binary 1111
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* that is a good is a good indicator
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*/
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if((header & 0xF000) == 0xF000)
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goto restart;
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#ifdef DEBUG_VERBOSE
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fprintf(stderr,
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"We found %x-%x-%x-%x and checksync %i and test %x\n",
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BYTE0(header), BYTE1(header), BYTE2(header), BYTE3(header),
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CHECKSYNC(header), (header & 0xF000) == 0xF000);
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#endif
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/* MPEG Audio Version */
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switch((header & 0x180000) >> 19) {
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case 2:
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version = 2;
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break;
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case 3:
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version = 1;
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break;
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default:
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return -1;
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}
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/* Layer */
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switch((header & 0x060000) >> 17) {
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case 1:
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layer = 3;
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break;
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case 2:
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layer = 2;
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break;
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case 3:
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layer = 1;
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break;
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default:
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return -1;
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}
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/* Bitrate */
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bitindex = (header & 0xF000) >> 12;
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bitrate = bitrate_table[version-1][layer-1][bitindex];
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if(bitrate == 0)
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return -1;
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/* Sampling frequency */
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freqindex = (header & 0x0C00) >> 10;
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frequency = freqtab[version-1][freqindex];
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if(frequency == 0)
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return -1;
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#ifdef DEBUG_VERBOSE
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fprintf(stderr,
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"Version %i, lay %i, biti %i, bitr %i, freqi %i, freq %i\n",
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version, layer, bitindex, bitrate, freqindex, frequency);
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#endif
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entry->bitrate = bitrate;
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entry->frequency = frequency;
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/* Calculate bytes per frame, calculation depends on layer */
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switch(layer) {
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case 1:
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bpf = bitrate_table[version - 1][layer - 1][bitindex];
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bpf *= 12000.0 * 4.0;
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bpf /= freqtab[version-1][freqindex] << (version - 1);
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break;
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case 2:
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case 3:
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bpf = bitrate_table[version - 1][layer - 1][bitindex];
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bpf *= 144000;
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bpf /= freqtab[version-1][freqindex] << (version - 1);
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break;
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default:
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bpf = 1.0;
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}
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/* Calculate time per frame */
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tpf = bs[layer] / freqtab[version-1][freqindex] << (version - 1);
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/*
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* Now song length is
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* ((filesize)/(bytes per frame))*(time per frame)
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*/
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return entry->filesize*tpf/bpf;
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}
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/*
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* Checks all relevant information (such as ID3v1 tag, ID3v2 tag, length etc)
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* about an MP3 file and updates it's entry accordingly.
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*
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* Arguments: entry - the entry to check and update with the new information
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*
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* Returns: void
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*/
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bool
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mp3info(mp3entry *entry, char *filename)
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{
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int fd;
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fd = open(filename, O_RDONLY);
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if(-1 == fd)
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return TRUE;
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memset(entry, 0, sizeof(mp3entry));
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entry->path = filename;
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entry->filesize = getfilesize(fd);
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entry->id3v2len = getid3v2len(fd);
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entry->id3v1len = getid3v1len(fd);
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entry->length = getsonglength(fd, entry);
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entry->title = NULL;
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if(HASID3V2(entry))
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setid3v2title(fd, entry);
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if(HASID3V1(entry) && !entry->title)
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setid3v1title(fd, entry);
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close(fd);
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return FALSE;
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}
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#ifdef DEBUG_STANDALONE
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char *secs2str(int ms)
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{
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static char buffer[32];
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int secs = ms/1000;
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ms %= 1000;
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snprintf(buffer, sizeof(buffer), "%d:%02d.%d", secs/60, secs%60, ms/100);
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return buffer;
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}
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int main(int argc, char **argv)
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{
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int i;
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for(i=1; i<argc; i++) {
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mp3entry mp3;
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if(mp3info(&mp3, argv[i])) {
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printf("Failed to get %s\n", argv[i]);
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return 0;
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}
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printf("****** File: %s\n"
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" Title: %s\n"
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" Artist: %s\n"
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" Album: %s\n"
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" Length: %s / %d s\n"
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" Bitrate: %d\n"
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" Frequency: %d\n",
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argv[i],
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mp3.title?mp3.title:"<blank>",
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mp3.artist?mp3.artist:"<blank>",
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mp3.album?mp3.album:"<blank>",
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secs2str(mp3.length),
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mp3.length/1000,
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mp3.bitrate,
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mp3.frequency);
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}
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return 0;
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}
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#endif
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/* -----------------------------------------------------------------
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* local variables:
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* eval: (load-file "rockbox-mode.el")
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* end:
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*/
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