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owntone-server/src/dynamic-art.c

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/*
* $Id$
* Dynamically merge .jpeg data into an mp3 tag
*
* Copyright (C) 2004 Hiren Joshi (hirenj@mooh.org)
*
* 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
*/
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "configfile.h"
#include "err.h"
#include "playlist.h"
#include "restart.h"
#define BLKSIZE PIPE_BUF
int *da_get_current_tag_info(int file_fd);
/* For some reason, we need to lose 2 bytes from this image size
This size is everything after the APIC text in this frame.
*/
/* APIC tag is made up from
APIC (4 bytes)
xxxx (4 bytes - Image size: raw + 16)
\0\0\0 (3 bytes)
image/jpeg (10 bytes)
\0\0\0 (3 bytes)
Image-data
*/
#define id3v3_image_size(x) x + 14
/* This size is everything after the PIC in this frame
*/
/* PIC tag is made up of
PIC (3 bytes)
xxx (3 bytes - Image size: raw + 6)
\0 (1 byte)
JPG (3 bytes)
\0\0 (2 bytes)
Image-data
*/
#define id3v2_image_size(x) x + 6
/* For some reason we need to fudge values - Why do we need 17 bytes here? */
#define id3v3_tag_size(x) id3v3_image_size(x) + 8
#define id3v2_tag_size(x) id3v2_image_size(x) + 6
/*
* get_image_fd
*
* Get a file descriptor for a piece of cover art.
*/
int da_get_image_fd(char *filename) {
unsigned char buffer[255];
char *path_end;
int fd;
strncpy(buffer,filename,255);
path_end = strrchr(buffer,'/');
strcpy(path_end+1,config.artfilename);
fd = open(buffer,O_RDONLY);
if(fd != -1)
DPRINTF(E_INF,L_ART,"Found image file %s (fd %d)\n",buffer,fd);
return fd;
}
/*
* get_current_tag_info
*
* Get the current tag from the file. We need to do this to determine whether we
* are dealing with an id3v2.2 or id3v2.3 tag so we can decide which artwork to
* attach to the song
*/
int *da_get_current_tag_info(int file_fd) {
unsigned char buffer[10];
int *tag_info;
tag_info = (int *) calloc(2,sizeof(int));
r_read(file_fd,buffer,10);
if ( strncmp(buffer,"ID3", 3) == 0 ) {
tag_info[0] = buffer[3];
tag_info[1] = ( buffer[6] << 21 ) + ( buffer[7] << 14 ) + ( buffer[8] << 7 ) + buffer[9];
return tag_info;
} else {
/* By default, we attach an id3v2.3 tag */
lseek(file_fd,0,SEEK_SET);
tag_info[0] = 2;
tag_info[1] = 0;
return tag_info;
}
}
/*
* attach_image
*
* Given an image, output and input mp3 file descriptor, attach the artwork found
* at the image file descriptor to the mp3 and stream the new id3 header to the client
* via the output file descriptor. If there is not id3 tag present, it will attach a tag
* to contain the artwork.
*/
int da_attach_image(int img_fd, int out_fd, int mp3_fd, int offset)
{
long img_size;
int tag_size;
int *tag_info;
unsigned char buffer[4];
struct stat sb;
fstat(img_fd,&sb);
img_size=sb.st_size;
DPRINTF(E_INF,L_ART,"Image appears to be %ld bytes\n",img_size);
if(img_size < 1) {
r_close(img_fd);
return 0;
}
if (offset > (img_size + 24) ) {
lseek(mp3_fd,(offset - img_size - 24),SEEK_SET);
r_close(img_fd);
return 0;
}
tag_info = da_get_current_tag_info(mp3_fd);
tag_size = tag_info[1];
DPRINTF(E_INF,L_ART,"Current tag size is %d bytes\n",tag_size);
if (tag_info[0] == 3) {
r_write(out_fd,"ID3\x03\0\0",6);
tag_size += id3v3_tag_size(img_size);
} else {
r_write(out_fd,"ID3\x02\0\0",6);
tag_size += id3v2_tag_size(img_size);
}
buffer[3] = tag_size & 0x7F;
buffer[2] = ( tag_size & 0x3F80 ) >> 7;
buffer[1] = ( tag_size & 0x1FC000 ) >> 14;
buffer[0] = ( tag_size & 0xFE00000 ) >> 21;
r_write(out_fd,buffer,4);
if (tag_info[0] == 3) {
r_write(out_fd,"APIC\0",5);
img_size = id3v3_image_size(img_size);
} else {
r_write(out_fd,"PIC",3);
img_size = id3v2_image_size(img_size);
}
buffer[0] = ( img_size & 0xFF0000 ) >> 16;
buffer[1] = ( img_size & 0xFF00 ) >> 8;
buffer[2] = ( img_size & 0xFF );
r_write(out_fd,buffer,3);
if (tag_info[0] == 3) {
r_write(out_fd,"\0\0\0image/jpeg\0\0\0",16);
} else {
r_write(out_fd,"\0JPG\x00\0",6);
}
lseek(img_fd,0,SEEK_SET);
copyfile(img_fd,out_fd);
DPRINTF(E_INF,L_ART,"Done copying IMG %ld\n",img_size);
r_close(img_fd);
free(tag_info);
return 0;
}
/**
* Rewrites the stco atom. It goes through the chunk offset atom list
* and adjusts them to take into account the 'covr' atom.
* extra_size is the amount to adjust by.
*/
off_t da_aac_rewrite_stco_atom(off_t extra_size, int out_fd, FILE *aac_fp,
off_t last_pos)
{
int aac_fd;
struct stat sb;
unsigned char buffer[4];
off_t file_size;
int atom_offset;
int atom_length;
off_t cur_pos;
off_t old_pos;
int i;
unsigned int num_entries;
unsigned int offset_entry;
aac_fd = fileno(aac_fp);
fstat(aac_fd, &sb);
file_size = sb.st_size;
/* 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_length);
if (atom_offset != -1) {
/* Skip flags */
fseek(aac_fp, 4, SEEK_CUR);
old_pos = last_pos;
cur_pos = ftell(aac_fp);
/* Copy from last point to this point. */
fseek(aac_fp, old_pos, SEEK_SET);
fcopyblock(aac_fp, out_fd, cur_pos - old_pos);
/* Read number of entries */
fread(buffer, 1, 4, aac_fp);
r_write(out_fd, buffer, 4);
num_entries = (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
DPRINTF(E_DBG, L_ART,"Readjusting %d 'stco' table offsets.\n", num_entries);
/* PENDING: Error check on num_entries? */
for (i = 0; i < num_entries; i++) {
fread(buffer, 1, 4, aac_fp);
offset_entry = (buffer[0] << 24) | (buffer[1] << 16) | (buffer[2] << 8) | buffer[3];
/* Adjust chunk offset. */
offset_entry += extra_size;
buffer[3] = offset_entry & 0xFF;
buffer[2] = (offset_entry >> 8) & 0xFF;
buffer[1] = (offset_entry >> 16) & 0xFF;
buffer[0] = (offset_entry >> 24) & 0xFF;
r_write(out_fd, buffer, 4);
offset_entry = 0;
}
return ftell(aac_fp);
} else {
DPRINTF(E_LOG, L_ART,"No 'stco' atom found.\n");
}
return last_pos;
}
/**
* Insert a 'covr' atom.
* extra_size is the size of the atom used to adjust all parent atoms.
*/
off_t da_aac_insert_covr_atom(off_t extra_size, int out_fd, FILE *aac_fp,
off_t last_pos, off_t file_size, int img_fd)
{
int aac_fd;
struct stat sb;
off_t old_pos;
unsigned char buffer[4];
int atom_offset;
int atom_length;
off_t cur_pos;
char *cp;
unsigned char img_type_flag = 0;
/* Figure out image file type since this needs to be encoded in the atom. */
cp = strrchr(config.artfilename, '.');
if (cp) {
if (!strcasecmp(cp, ".jpeg") || !strcasecmp(cp, ".jpg")) {
img_type_flag = 0x0d;
}
else if (!strcasecmp(cp, ".png")) {
img_type_flag = 0x0e;
} else {
DPRINTF(E_LOG,L_ART, "Image type '%s' not supported.\n", cp);
return 0;
}
} else {
DPRINTF(E_LOG, L_ART, "No file extension for image file.\n");
}
aac_fd = fileno(aac_fp);
fstat(aac_fd, &sb);
file_size = sb.st_size;
rewind(aac_fp);
atom_offset = scan_aac_findatom(aac_fp, file_size, "moov", &atom_length);
if (atom_offset != -1) {
atom_offset = scan_aac_findatom(aac_fp, atom_length - 8, "udta", &atom_length);
if (atom_offset != -1) {
old_pos = last_pos;
cur_pos = ftell(aac_fp) - 8;
DPRINTF(E_INF,L_ART,"Found udta atom at %ld.\n", cur_pos);
fseek(aac_fp, old_pos, SEEK_SET);
fcopyblock(aac_fp, out_fd, cur_pos - old_pos);
/* Write out new length */
atom_length += extra_size;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
cur_pos += 4;
fseek(aac_fp, 8, SEEK_CUR);
atom_offset = scan_aac_findatom(aac_fp, atom_length - 8, "meta", &atom_length);
if (atom_offset != -1) {
old_pos = cur_pos;
cur_pos = ftell(aac_fp) - 8;
DPRINTF(E_INF,L_ART,"Found meta atom at %ld.\n", cur_pos);
fseek(aac_fp, old_pos, SEEK_SET);
fcopyblock(aac_fp, out_fd, cur_pos - old_pos);
/* Write out new length */
atom_length += extra_size;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
cur_pos += 4;
fseek(aac_fp, 12, SEEK_CUR); /* "meta" atom hack. */
atom_offset = scan_aac_findatom(aac_fp, atom_length - 8, "ilst", &atom_length);
if (atom_offset != -1) {
old_pos = cur_pos;
cur_pos = ftell(aac_fp) - 8;
DPRINTF(E_INF,L_ART,"Found ilst atom at %ld.\n", cur_pos);
fseek(aac_fp, old_pos, SEEK_SET);
fcopyblock(aac_fp, out_fd, cur_pos - old_pos);
old_pos = cur_pos + 4;
cur_pos += atom_length;
/* Write out new length */
atom_length += extra_size;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
/* Copy all 'ilst' children (all the MP4 'tags'). We will append
at the end. */
fseek(aac_fp, old_pos, SEEK_SET);
fcopyblock(aac_fp, out_fd, cur_pos - old_pos);
cur_pos = ftell(aac_fp);
/* Write out 'covr' atom */
atom_length = extra_size;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
r_write(out_fd, "covr", 4);
/* Write out 'data' atom */
atom_length = extra_size - 8;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
r_write(out_fd, "data", 4);
/* Write out 'data' flags */
buffer[3] = img_type_flag;
buffer[2] = 0;
buffer[1] = 0;
buffer[0] = 0;
r_write(out_fd, buffer, 4);
/* Reserved? Zero in any case. */
buffer[3] = 0;
buffer[2] = 0;
buffer[1] = 0;
buffer[0] = 0;
r_write(out_fd, buffer, 4);
/* Now ready for the image stream. Copy it over. */
lseek(img_fd,0,SEEK_SET);
copyfile(img_fd,out_fd);
last_pos = cur_pos;
} else {
DPRINTF(E_LOG, L_ART,"No 'ilst' atom found.\n");
}
} else {
DPRINTF(E_LOG,L_ART, "No 'meta' atom found.\n");
}
} else {
DPRINTF(E_LOG,L_ART, "No 'udta' atom found.\n");
}
} else {
DPRINTF(E_LOG,L_ART, "No 'moov' atom found.\n");
}
/* Seek to position right after 'udta' atom. Let main() stream out the
rest. */
lseek(aac_fd, last_pos, SEEK_SET);
return last_pos;
}
/*
* attach_image
*
* Given an image, output and input aac file descriptor, attach the artwork
* found at the image file descriptor to the aac and stream the new atom to
* the client via the output file descriptor.
* Currently, if the meta info atoms are non-existent, this will fail.
*/
off_t da_aac_attach_image(int img_fd, int out_fd, int aac_fd, int offset)
{
off_t img_size;
int atom_length;
unsigned int extra_size;
off_t file_size;
unsigned char buffer[4];
struct stat sb;
FILE *aac_fp;
off_t stco_atom_pos;
off_t ilst_atom_pos;
off_t last_pos;
fstat(img_fd, &sb);
img_size = sb.st_size;
DPRINTF(E_INF,L_ART,"Image size (in bytes): %ld.\n", img_size);
/* PENDING: We can be stricter here by checking the shortest header between
PNG and JPG and using that length. */
if (img_size < 1) {
r_close(img_fd);
return 0;
}
/* Include extra bytes for 'covr' atom length (4) and type (4) and its
'data' item length (4) and type (4) plus 4 bytes for the 'data' atom's
flags and 4 reserved(?) bytes. */
extra_size = img_size + 24;
fstat(aac_fd, &sb);
file_size = sb.st_size;
aac_fp = fdopen(dup(aac_fd), "r");
stco_atom_pos = aac_drilltoatom(aac_fp, "moov:trak:mdia:minf:stbl:stco",
&atom_length);
ilst_atom_pos = aac_drilltoatom(aac_fp, "moov:udta:meta:ilst",
&atom_length);
last_pos = aac_drilltoatom(aac_fp, "mdat", &atom_length);
if (last_pos != -1) {
if (offset >= last_pos) {
/* Offset is in the actual music data so don't bother processing
meta data. */
return 0;
}
} else {
DPRINTF(E_LOG,L_ART, "No 'mdat' atom.\n");
return 0;
}
rewind(aac_fp);
/* Re-adjust length of 'moov' atom. */
last_pos = scan_aac_findatom(aac_fp, file_size, "moov", &atom_length);
if (last_pos != -1) {
/* Copy everything from up to this atom */
rewind(aac_fp);
fcopyblock(aac_fp, out_fd, last_pos);
/* Write out new length. */
atom_length += extra_size;
buffer[3] = atom_length & 0xFF;
buffer[2] = ( atom_length >> 8 ) & 0xFF;
buffer[1] = ( atom_length >> 16 ) & 0xFF;
buffer[0] = ( atom_length >> 24 ) & 0xFF;
r_write(out_fd, buffer, 4);
last_pos += 4;
} else {
DPRINTF(E_LOG,L_ART, "Could not find 'moov' atom.\n");
return 0;
}
if (stco_atom_pos < ilst_atom_pos) {
last_pos = da_aac_rewrite_stco_atom(extra_size, out_fd, aac_fp, last_pos);
last_pos = da_aac_insert_covr_atom(extra_size, out_fd, aac_fp, last_pos,
file_size, img_fd);
} else {
last_pos = da_aac_insert_covr_atom(extra_size, out_fd, aac_fp, last_pos,
file_size, img_fd);
last_pos = da_aac_rewrite_stco_atom(extra_size, out_fd, aac_fp, last_pos);
}
/* Seek to position right after last atom. Let main() stream out the rest. */
lseek(aac_fd, last_pos, SEEK_SET);
r_close(img_fd);
fclose(aac_fp);
return last_pos;
}
int copyblock(int fromfd, int tofd, size_t size) {
char buf[BLKSIZE];
int bytesread;
int totalbytes = 0;
int blocksize = BLKSIZE;
int bytesleft;
while (totalbytes < size) {
bytesleft = size - totalbytes;
if (bytesleft < BLKSIZE) {
blocksize = bytesleft;
} else {
blocksize = BLKSIZE;
}
if ((bytesread = r_read(fromfd, buf, blocksize)) < 0)
return -1;
if (bytesread == 0)
return totalbytes;
if (r_write(tofd, buf, bytesread) < 0)
return -1;
totalbytes += bytesread;
}
return totalbytes;
}
int fcopyblock(FILE *fromfp, int tofd, size_t size) {
char buf[BLKSIZE];
int bytesread;
int totalbytes = 0;
int blocksize = BLKSIZE;
int bytesleft;
while (totalbytes < size) {
bytesleft = size - totalbytes;
if (bytesleft < BLKSIZE) {
blocksize = bytesleft;
} else {
blocksize = BLKSIZE;
}
if ((bytesread = fread(buf, 1, blocksize, fromfp)) < blocksize) {
if (ferror(fromfp))
return -1;
}
if (r_write(tofd, buf, bytesread) < 0)
return -1;
if (feof(fromfp))
return 0;
totalbytes += bytesread;
}
return totalbytes;
}
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