7
static uint32_t fix_byte_order_32(uint32_t src)
13
memcpy(data,&src,sizeof(src));
19
result = (a<<24) | (b<<16) | (c<<8) | d;
20
return (uint32_t)result;
23
static uint16_t fix_byte_order_16(uint16_t src)
29
memcpy(data,&src,sizeof(src));
34
return (uint16_t)result;
46
unsigned membuffer_write(membuffer * buf,const void * ptr,unsigned bytes)
48
unsigned dest_size = buf->written + bytes;
50
if (buf->error) return 0;
51
if (dest_size > buf->allocated)
56
} while(dest_size > buf->allocated);
59
void * newptr = realloc(buf->data,buf->allocated);
71
if (ptr) memcpy((char*)buf->data + buf->written,ptr,bytes);
72
buf->written += bytes;
76
#define membuffer_write_data membuffer_write
78
unsigned membuffer_write_int32(membuffer * buf,uint32_t data)
80
uint8_t temp[4] = {(uint8_t)(data>>24),(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
81
return membuffer_write_data(buf,temp,4);
84
unsigned membuffer_write_int24(membuffer * buf,uint32_t data)
86
uint8_t temp[3] = {(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
87
return membuffer_write_data(buf,temp,3);
90
unsigned membuffer_write_int16(membuffer * buf,uint16_t data)
92
uint8_t temp[2] = {(uint8_t)(data>>8),(uint8_t)data};
93
return membuffer_write_data(buf,temp,2);
96
unsigned membuffer_write_atom_name(membuffer * buf,const char * data)
98
return membuffer_write_data(buf,data,4)==4 ? 1 : 0;
101
void membuffer_write_atom(membuffer * buf,const char * name,unsigned size,const void * data)
103
membuffer_write_int32(buf,size + 8);
104
membuffer_write_atom_name(buf,name);
105
membuffer_write_data(buf,data,size);
108
unsigned membuffer_write_string(membuffer * buf,const char * data)
110
return membuffer_write_data(buf,data,strlen(data));
113
unsigned membuffer_write_int8(membuffer * buf,uint8_t data)
115
return membuffer_write_data(buf,&data,1);
118
void * membuffer_get_ptr(const membuffer * buf)
123
unsigned membuffer_get_size(const membuffer * buf)
128
unsigned membuffer_error(const membuffer * buf)
133
void membuffer_set_error(membuffer * buf) {buf->error = 1;}
135
unsigned membuffer_transfer_from_file(membuffer * buf,mp4ff_t * src,unsigned bytes)
140
oldsize = membuffer_get_size(buf);
141
if (membuffer_write_data(buf,0,bytes) != bytes) return 0;
143
bufptr = membuffer_get_ptr(buf);
144
if (bufptr==0) return 0;
146
if ((unsigned)mp4ff_read_data(src,(char*)bufptr + oldsize,bytes)!=bytes)
148
membuffer_set_error(buf);
156
membuffer * membuffer_create()
158
const unsigned initial_size = 256;
160
membuffer * buf = (membuffer *) malloc(sizeof(membuffer));
161
buf->data = malloc(initial_size);
163
buf->allocated = initial_size;
164
buf->error = buf->data == 0 ? 1 : 0;
169
void membuffer_free(membuffer * buf)
171
if (buf->data) free(buf->data);
175
void * membuffer_detach(membuffer * buf)
179
if (buf->error) return 0;
181
ret = realloc(buf->data,buf->written);
183
if (ret == 0) free(buf->data);
192
/* metadata tag structure */
199
/* metadata list structure */
213
static stdmeta_entry stdmetas[] =
221
{"ļæ½cmt","comment"},
222
// {"ļæ½gen","genre"},
223
{"cpil","compilation"},
231
static const char* find_standard_meta(const char * name) //returns atom name if found, 0 if not
234
for(n=0;n<sizeof(stdmetas)/sizeof(stdmetas[0]);n++)
236
if (!stricmp(name,stdmetas[n].name)) return stdmetas[n].atom;
241
static void membuffer_write_track_tag(membuffer * buf,const char * name,uint32_t index,uint32_t total)
243
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
244
membuffer_write_atom_name(buf,name);
245
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
246
membuffer_write_atom_name(buf,"data");
247
membuffer_write_int32(buf,0);//flags
248
membuffer_write_int32(buf,0);//reserved
249
membuffer_write_int16(buf,0);
250
membuffer_write_int16(buf,(uint16_t)index);//track number
251
membuffer_write_int16(buf,(uint16_t)total);//total tracks
252
membuffer_write_int16(buf,0);
255
static void membuffer_write_int16_tag(membuffer * buf,const char * name,uint16_t value)
257
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
258
membuffer_write_atom_name(buf,name);
259
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
260
membuffer_write_atom_name(buf,"data");
261
membuffer_write_int32(buf,0);//flags
262
membuffer_write_int32(buf,0);//reserved
263
membuffer_write_int16(buf,value);//value
266
static void membuffer_write_std_tag(membuffer * buf,const char * name,const char * value)
268
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value) );
269
membuffer_write_atom_name(buf,name);
270
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
271
membuffer_write_atom_name(buf,"data");
272
membuffer_write_int32(buf,1);//flags
273
membuffer_write_int32(buf,0);//reserved
274
membuffer_write_data(buf,value,strlen(value));
277
static void membuffer_write_custom_tag(membuffer * buf,const char * name,const char * value)
279
membuffer_write_int32(buf,8 /*atom header*/ + 0x1C /*weirdo itunes atom*/ + 12 /*name atom header*/ + strlen(name) + 16 /*data atom header + flags*/ + strlen(value) );
280
membuffer_write_atom_name(buf,"----");
281
membuffer_write_int32(buf,0x1C);//weirdo itunes atom
282
membuffer_write_atom_name(buf,"mean");
283
membuffer_write_int32(buf,0);
284
membuffer_write_data(buf,"com.apple.iTunes",16);
285
membuffer_write_int32(buf,12 + strlen(name));
286
membuffer_write_atom_name(buf,"name");
287
membuffer_write_int32(buf,0);
288
membuffer_write_data(buf,name,strlen(name));
289
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
290
membuffer_write_atom_name(buf,"data");
291
membuffer_write_int32(buf,1);//flags
292
membuffer_write_int32(buf,0);//reserved
293
membuffer_write_data(buf,value,strlen(value));
297
static uint32_t myatoi(const char * param)
299
return param ? atoi(param) : 0;
302
static uint32_t create_ilst(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
304
membuffer * buf = membuffer_create();
306
char * mask = (char*)malloc(data->count);
307
memset(mask,0,data->count);
310
const char * tracknumber_ptr = 0, * totaltracks_ptr = 0;
311
const char * discnumber_ptr = 0, * totaldiscs_ptr = 0;
312
const char * genre_ptr = 0, * tempo_ptr = 0;
313
for(metaptr = 0; metaptr < data->count; metaptr++)
315
mp4ff_tag_t * tag = &data->tags[metaptr];
316
if (!stricmp(tag->item,"tracknumber") || !stricmp(tag->item,"track"))
318
if (tracknumber_ptr==0) tracknumber_ptr = tag->value;
321
else if (!stricmp(tag->item,"totaltracks"))
323
if (totaltracks_ptr==0) totaltracks_ptr = tag->value;
326
else if (!stricmp(tag->item,"discnumber") || !stricmp(tag->item,"disc"))
328
if (discnumber_ptr==0) discnumber_ptr = tag->value;
331
else if (!stricmp(tag->item,"totaldiscs"))
333
if (totaldiscs_ptr==0) totaldiscs_ptr = tag->value;
336
else if (!stricmp(tag->item,"genre"))
338
if (genre_ptr==0) genre_ptr = tag->value;
341
else if (!stricmp(tag->item,"tempo"))
343
if (tempo_ptr==0) tempo_ptr = tag->value;
349
if (tracknumber_ptr) membuffer_write_track_tag(buf,"trkn",myatoi(tracknumber_ptr),myatoi(totaltracks_ptr));
350
if (discnumber_ptr) membuffer_write_track_tag(buf,"disk",myatoi(discnumber_ptr),myatoi(totaldiscs_ptr));
351
if (tempo_ptr) membuffer_write_int16_tag(buf,"tmpo",(uint16_t)myatoi(tempo_ptr));
355
uint32_t index = mp4ff_meta_genre_to_index(genre_ptr);
357
membuffer_write_std_tag(buf,"ļæ½gen",genre_ptr);
359
membuffer_write_int16_tag(buf,"gnre",(uint16_t)index);
363
for(metaptr = 0; metaptr < data->count; metaptr++)
367
mp4ff_tag_t * tag = &data->tags[metaptr];
368
const char * std_meta_atom = find_standard_meta(tag->item);
371
membuffer_write_std_tag(buf,std_meta_atom,tag->value);
375
membuffer_write_custom_tag(buf,tag->item,tag->value);
382
if (membuffer_error(buf))
388
*out_size = membuffer_get_size(buf);
389
*out_buffer = membuffer_detach(buf);
395
static uint32_t find_atom(mp4ff_t * f,uint64_t base,uint32_t size,const char * name)
397
uint32_t remaining = size;
398
uint64_t atom_offset = base;
404
mp4ff_set_position(f,atom_offset);
406
if (remaining < 8) break;
407
atom_size = mp4ff_read_int32(f);
408
if (atom_size > remaining || atom_size < 8) break;
409
mp4ff_read_data(f,atom_name,4);
411
if (!memcmp(atom_name,name,4))
413
mp4ff_set_position(f,atom_offset);
417
remaining -= atom_size;
418
atom_offset += atom_size;
423
static uint32_t find_atom_v2(mp4ff_t * f,uint64_t base,uint32_t size,const char * name,uint32_t extraheaders,const char * name_inside)
425
uint64_t first_base = (uint64_t)(-1);
426
while(find_atom(f,base,size,name))//try to find atom <name> with atom <name_inside> in it
428
uint64_t mybase = mp4ff_position(f);
429
uint32_t mysize = mp4ff_read_int32(f);
431
if (first_base == (uint64_t)(-1)) first_base = mybase;
433
if (mysize < 8 + extraheaders) break;
435
if (find_atom(f,mybase+(8+extraheaders),mysize-(8+extraheaders),name_inside))
437
mp4ff_set_position(f,mybase);
441
if (size<=mysize) {size=0;break;}
445
if (first_base != (uint64_t)(-1))//wanted atom inside not found
447
mp4ff_set_position(f,first_base);
453
static uint32_t create_meta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
459
if (!create_ilst(data,&ilst_buffer,&ilst_size)) return 0;
461
buf = membuffer_create();
463
membuffer_write_int32(buf,0);
464
membuffer_write_atom(buf,"ilst",ilst_size,ilst_buffer);
467
*out_size = membuffer_get_size(buf);
468
*out_buffer = membuffer_detach(buf);
473
static uint32_t create_udta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
479
if (!create_meta(data,&meta_buffer,&meta_size)) return 0;
481
buf = membuffer_create();
483
membuffer_write_atom(buf,"meta",meta_size,meta_buffer);
487
*out_size = membuffer_get_size(buf);
488
*out_buffer = membuffer_detach(buf);
493
static uint32_t modify_moov(mp4ff_t * f,const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
495
uint64_t total_base = f->moov_offset + 8;
496
uint32_t total_size = (uint32_t)(f->moov_size - 8);
498
uint64_t udta_offset,meta_offset,ilst_offset;
499
uint32_t udta_size, meta_size, ilst_size;
501
uint32_t new_ilst_size;
502
void * new_ilst_buffer;
508
if (!find_atom_v2(f,total_base,total_size,"udta",0,"meta"))
511
void * new_udta_buffer;
512
uint32_t new_udta_size;
513
if (!create_udta(data,&new_udta_buffer,&new_udta_size)) return 0;
515
buf = membuffer_create();
516
mp4ff_set_position(f,total_base);
517
membuffer_transfer_from_file(buf,f,total_size);
519
membuffer_write_atom(buf,"udta",new_udta_size,new_udta_buffer);
521
free(new_udta_buffer);
523
*out_size = membuffer_get_size(buf);
524
*out_buffer = membuffer_detach(buf);
530
udta_offset = mp4ff_position(f);
531
udta_size = mp4ff_read_int32(f);
532
if (!find_atom_v2(f,udta_offset+8,udta_size-8,"meta",4,"ilst"))
535
void * new_meta_buffer;
536
uint32_t new_meta_size;
537
if (!create_meta(data,&new_meta_buffer,&new_meta_size)) return 0;
539
buf = membuffer_create();
540
mp4ff_set_position(f,total_base);
541
membuffer_transfer_from_file(buf,f,(uint32_t)(udta_offset - total_base));
543
membuffer_write_int32(buf,udta_size + 8 + new_meta_size);
544
membuffer_write_atom_name(buf,"udta");
545
membuffer_transfer_from_file(buf,f,udta_size);
547
membuffer_write_atom(buf,"meta",new_meta_size,new_meta_buffer);
548
free(new_meta_buffer);
550
*out_size = membuffer_get_size(buf);
551
*out_buffer = membuffer_detach(buf);
555
meta_offset = mp4ff_position(f);
556
meta_size = mp4ff_read_int32(f);
557
if (!find_atom(f,meta_offset+12,meta_size-12,"ilst")) return 0;//shouldn't happen, find_atom_v2 above takes care of it
558
ilst_offset = mp4ff_position(f);
559
ilst_size = mp4ff_read_int32(f);
561
if (!create_ilst(data,&new_ilst_buffer,&new_ilst_size)) return 0;
563
size_delta = new_ilst_size - (ilst_size - 8);
565
*out_size = total_size + size_delta;
566
*out_buffer = malloc(*out_size);
567
if (*out_buffer == 0)
569
free(new_ilst_buffer);
573
p_out = (uint8_t*)*out_buffer;
575
mp4ff_set_position(f,total_base);
576
mp4ff_read_data(f,p_out,(uint32_t)(udta_offset - total_base )); p_out += (uint32_t)(udta_offset - total_base );
577
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
578
mp4ff_read_data(f,p_out,4); p_out += 4;
579
mp4ff_read_data(f,p_out,(uint32_t)(meta_offset - udta_offset - 8)); p_out += (uint32_t)(meta_offset - udta_offset - 8);
580
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
581
mp4ff_read_data(f,p_out,4); p_out += 4;
582
mp4ff_read_data(f,p_out,(uint32_t)(ilst_offset - meta_offset - 8)); p_out += (uint32_t)(ilst_offset - meta_offset - 8);
583
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
584
mp4ff_read_data(f,p_out,4); p_out += 4;
586
memcpy(p_out,new_ilst_buffer,new_ilst_size);
587
p_out += new_ilst_size;
589
mp4ff_set_position(f,ilst_offset + ilst_size);
590
mp4ff_read_data(f,p_out,(uint32_t)(total_size - (ilst_offset - total_base) - ilst_size));
592
free(new_ilst_buffer);
598
int32_t mp4ff_meta_update(mp4ff_callback_t *f,const mp4ff_metadata_t * data)
600
void * new_moov_data;
601
uint32_t new_moov_size;
603
mp4ff_t *ff = malloc(sizeof(mp4ff_t));
605
memset(ff, 0, sizeof(mp4ff_t));
607
mp4ff_set_position(ff,0);
612
if (!modify_moov(ff,data,&new_moov_data,&new_moov_size))
618
/* copy moov atom to end of the file */
619
if (ff->last_atom != ATOM_MOOV)
621
char *free_data = "free";
623
/* rename old moov to free */
624
mp4ff_set_position(ff, ff->moov_offset + 4);
625
mp4ff_write_data(ff, free_data, 4);
627
mp4ff_set_position(ff, ff->file_size);
628
mp4ff_write_int32(ff,new_moov_size + 8);
629
mp4ff_write_data(ff,"moov",4);
630
mp4ff_write_data(ff, new_moov_data, new_moov_size);
634
mp4ff_set_position(ff, ff->moov_offset);
635
mp4ff_write_int32(ff,new_moov_size + 8);
636
mp4ff_write_data(ff,"moov",4);
637
mp4ff_write_data(ff, new_moov_data, new_moov_size);
7
static uint32_t fix_byte_order_32(uint32_t src)
13
memcpy(data,&src,sizeof(src));
19
result = (a<<24) | (b<<16) | (c<<8) | d;
20
return (uint32_t)result;
23
static uint16_t fix_byte_order_16(uint16_t src)
29
memcpy(data,&src,sizeof(src));
34
return (uint16_t)result;
46
unsigned membuffer_write(membuffer * buf,const void * ptr,unsigned bytes)
48
unsigned dest_size = buf->written + bytes;
50
if (buf->error) return 0;
51
if (dest_size > buf->allocated)
56
} while(dest_size > buf->allocated);
59
void * newptr = realloc(buf->data,buf->allocated);
71
if (ptr) memcpy((char*)buf->data + buf->written,ptr,bytes);
72
buf->written += bytes;
76
#define membuffer_write_data membuffer_write
78
unsigned membuffer_write_int32(membuffer * buf,uint32_t data)
80
uint8_t temp[4] = {(uint8_t)(data>>24),(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
81
return membuffer_write_data(buf,temp,4);
84
unsigned membuffer_write_int24(membuffer * buf,uint32_t data)
86
uint8_t temp[3] = {(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
87
return membuffer_write_data(buf,temp,3);
90
unsigned membuffer_write_int16(membuffer * buf,uint16_t data)
92
uint8_t temp[2] = {(uint8_t)(data>>8),(uint8_t)data};
93
return membuffer_write_data(buf,temp,2);
96
unsigned membuffer_write_atom_name(membuffer * buf,const char * data)
98
return membuffer_write_data(buf,data,4)==4 ? 1 : 0;
101
void membuffer_write_atom(membuffer * buf,const char * name,unsigned size,const void * data)
103
membuffer_write_int32(buf,size + 8);
104
membuffer_write_atom_name(buf,name);
105
membuffer_write_data(buf,data,size);
108
unsigned membuffer_write_string(membuffer * buf,const char * data)
110
return membuffer_write_data(buf,data,strlen(data));
113
unsigned membuffer_write_int8(membuffer * buf,uint8_t data)
115
return membuffer_write_data(buf,&data,1);
118
void * membuffer_get_ptr(const membuffer * buf)
123
unsigned membuffer_get_size(const membuffer * buf)
128
unsigned membuffer_error(const membuffer * buf)
133
void membuffer_set_error(membuffer * buf) {buf->error = 1;}
135
unsigned membuffer_transfer_from_file(membuffer * buf,mp4ff_t * src,unsigned bytes)
140
oldsize = membuffer_get_size(buf);
141
if (membuffer_write_data(buf,0,bytes) != bytes) return 0;
143
bufptr = membuffer_get_ptr(buf);
144
if (bufptr==0) return 0;
146
if ((unsigned)mp4ff_read_data(src,(char*)bufptr + oldsize,bytes)!=bytes)
148
membuffer_set_error(buf);
156
membuffer * membuffer_create()
158
const unsigned initial_size = 256;
160
membuffer * buf = (membuffer *) malloc(sizeof(membuffer));
161
buf->data = malloc(initial_size);
163
buf->allocated = initial_size;
164
buf->error = buf->data == 0 ? 1 : 0;
169
void membuffer_free(membuffer * buf)
171
if (buf->data) free(buf->data);
175
void * membuffer_detach(membuffer * buf)
179
if (buf->error) return 0;
181
ret = realloc(buf->data,buf->written);
183
if (ret == 0) free(buf->data);
192
/* metadata tag structure */
199
/* metadata list structure */
213
static stdmeta_entry stdmetas[] =
221
{"ļæ½cmt","comment"},
222
// {"ļæ½gen","genre"},
223
{"cpil","compilation"},
231
static const char* find_standard_meta(const char * name) //returns atom name if found, 0 if not
234
for(n=0;n<sizeof(stdmetas)/sizeof(stdmetas[0]);n++)
236
if (!stricmp(name,stdmetas[n].name)) return stdmetas[n].atom;
241
static void membuffer_write_track_tag(membuffer * buf,const char * name,uint32_t index,uint32_t total)
243
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
244
membuffer_write_atom_name(buf,name);
245
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
246
membuffer_write_atom_name(buf,"data");
247
membuffer_write_int32(buf,0);//flags
248
membuffer_write_int32(buf,0);//reserved
249
membuffer_write_int16(buf,0);
250
membuffer_write_int16(buf,(uint16_t)index);//track number
251
membuffer_write_int16(buf,(uint16_t)total);//total tracks
252
membuffer_write_int16(buf,0);
255
static void membuffer_write_int16_tag(membuffer * buf,const char * name,uint16_t value)
257
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
258
membuffer_write_atom_name(buf,name);
259
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
260
membuffer_write_atom_name(buf,"data");
261
membuffer_write_int32(buf,0);//flags
262
membuffer_write_int32(buf,0);//reserved
263
membuffer_write_int16(buf,value);//value
266
static void membuffer_write_std_tag(membuffer * buf,const char * name,const char * value)
268
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value) );
269
membuffer_write_atom_name(buf,name);
270
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
271
membuffer_write_atom_name(buf,"data");
272
membuffer_write_int32(buf,1);//flags
273
membuffer_write_int32(buf,0);//reserved
274
membuffer_write_data(buf,value,strlen(value));
277
static void membuffer_write_custom_tag(membuffer * buf,const char * name,const char * value)
279
membuffer_write_int32(buf,8 /*atom header*/ + 0x1C /*weirdo itunes atom*/ + 12 /*name atom header*/ + strlen(name) + 16 /*data atom header + flags*/ + strlen(value) );
280
membuffer_write_atom_name(buf,"----");
281
membuffer_write_int32(buf,0x1C);//weirdo itunes atom
282
membuffer_write_atom_name(buf,"mean");
283
membuffer_write_int32(buf,0);
284
membuffer_write_data(buf,"com.apple.iTunes",16);
285
membuffer_write_int32(buf,12 + strlen(name));
286
membuffer_write_atom_name(buf,"name");
287
membuffer_write_int32(buf,0);
288
membuffer_write_data(buf,name,strlen(name));
289
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
290
membuffer_write_atom_name(buf,"data");
291
membuffer_write_int32(buf,1);//flags
292
membuffer_write_int32(buf,0);//reserved
293
membuffer_write_data(buf,value,strlen(value));
297
static uint32_t myatoi(const char * param)
299
return param ? atoi(param) : 0;
302
static uint32_t create_ilst(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
304
membuffer * buf = membuffer_create();
306
char * mask = (char*)malloc(data->count);
307
memset(mask,0,data->count);
310
const char * tracknumber_ptr = 0, * totaltracks_ptr = 0;
311
const char * discnumber_ptr = 0, * totaldiscs_ptr = 0;
312
const char * genre_ptr = 0, * tempo_ptr = 0;
313
for(metaptr = 0; metaptr < data->count; metaptr++)
315
mp4ff_tag_t * tag = &data->tags[metaptr];
316
if (!stricmp(tag->item,"tracknumber") || !stricmp(tag->item,"track"))
318
if (tracknumber_ptr==0) tracknumber_ptr = tag->value;
321
else if (!stricmp(tag->item,"totaltracks"))
323
if (totaltracks_ptr==0) totaltracks_ptr = tag->value;
326
else if (!stricmp(tag->item,"discnumber") || !stricmp(tag->item,"disc"))
328
if (discnumber_ptr==0) discnumber_ptr = tag->value;
331
else if (!stricmp(tag->item,"totaldiscs"))
333
if (totaldiscs_ptr==0) totaldiscs_ptr = tag->value;
336
else if (!stricmp(tag->item,"genre"))
338
if (genre_ptr==0) genre_ptr = tag->value;
341
else if (!stricmp(tag->item,"tempo"))
343
if (tempo_ptr==0) tempo_ptr = tag->value;
349
if (tracknumber_ptr) membuffer_write_track_tag(buf,"trkn",myatoi(tracknumber_ptr),myatoi(totaltracks_ptr));
350
if (discnumber_ptr) membuffer_write_track_tag(buf,"disk",myatoi(discnumber_ptr),myatoi(totaldiscs_ptr));
351
if (tempo_ptr) membuffer_write_int16_tag(buf,"tmpo",(uint16_t)myatoi(tempo_ptr));
355
uint32_t index = mp4ff_meta_genre_to_index(genre_ptr);
357
membuffer_write_std_tag(buf,"ļæ½gen",genre_ptr);
359
membuffer_write_int16_tag(buf,"gnre",(uint16_t)index);
363
for(metaptr = 0; metaptr < data->count; metaptr++)
367
mp4ff_tag_t * tag = &data->tags[metaptr];
368
const char * std_meta_atom = find_standard_meta(tag->item);
371
membuffer_write_std_tag(buf,std_meta_atom,tag->value);
375
membuffer_write_custom_tag(buf,tag->item,tag->value);
382
if (membuffer_error(buf))
388
*out_size = membuffer_get_size(buf);
389
*out_buffer = membuffer_detach(buf);
395
static uint32_t find_atom(mp4ff_t * f,uint64_t base,uint32_t size,const char * name)
397
uint32_t remaining = size;
398
uint64_t atom_offset = base;
404
mp4ff_set_position(f,atom_offset);
406
if (remaining < 8) break;
407
atom_size = mp4ff_read_int32(f);
408
if (atom_size > remaining || atom_size < 8) break;
409
mp4ff_read_data(f,atom_name,4);
411
if (!memcmp(atom_name,name,4))
413
mp4ff_set_position(f,atom_offset);
417
remaining -= atom_size;
418
atom_offset += atom_size;
423
static uint32_t find_atom_v2(mp4ff_t * f,uint64_t base,uint32_t size,const char * name,uint32_t extraheaders,const char * name_inside)
425
uint64_t first_base = (uint64_t)(-1);
426
while(find_atom(f,base,size,name))//try to find atom <name> with atom <name_inside> in it
428
uint64_t mybase = mp4ff_position(f);
429
uint32_t mysize = mp4ff_read_int32(f);
431
if (first_base == (uint64_t)(-1)) first_base = mybase;
433
if (mysize < 8 + extraheaders) break;
435
if (find_atom(f,mybase+(8+extraheaders),mysize-(8+extraheaders),name_inside))
437
mp4ff_set_position(f,mybase);
441
if (size<=mysize) {size=0;break;}
445
if (first_base != (uint64_t)(-1))//wanted atom inside not found
447
mp4ff_set_position(f,first_base);
453
static uint32_t create_meta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
459
if (!create_ilst(data,&ilst_buffer,&ilst_size)) return 0;
461
buf = membuffer_create();
463
membuffer_write_int32(buf,0);
464
membuffer_write_atom(buf,"ilst",ilst_size,ilst_buffer);
467
*out_size = membuffer_get_size(buf);
468
*out_buffer = membuffer_detach(buf);
473
static uint32_t create_udta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
479
if (!create_meta(data,&meta_buffer,&meta_size)) return 0;
481
buf = membuffer_create();
483
membuffer_write_atom(buf,"meta",meta_size,meta_buffer);
487
*out_size = membuffer_get_size(buf);
488
*out_buffer = membuffer_detach(buf);
493
static uint32_t modify_moov(mp4ff_t * f,const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
495
uint64_t total_base = f->moov_offset + 8;
496
uint32_t total_size = (uint32_t)(f->moov_size - 8);
498
uint64_t udta_offset,meta_offset,ilst_offset;
499
uint32_t udta_size, meta_size, ilst_size;
501
uint32_t new_ilst_size;
502
void * new_ilst_buffer;
508
if (!find_atom_v2(f,total_base,total_size,"udta",0,"meta"))
511
void * new_udta_buffer;
512
uint32_t new_udta_size;
513
if (!create_udta(data,&new_udta_buffer,&new_udta_size)) return 0;
515
buf = membuffer_create();
516
mp4ff_set_position(f,total_base);
517
membuffer_transfer_from_file(buf,f,total_size);
519
membuffer_write_atom(buf,"udta",new_udta_size,new_udta_buffer);
521
free(new_udta_buffer);
523
*out_size = membuffer_get_size(buf);
524
*out_buffer = membuffer_detach(buf);
530
udta_offset = mp4ff_position(f);
531
udta_size = mp4ff_read_int32(f);
532
if (!find_atom_v2(f,udta_offset+8,udta_size-8,"meta",4,"ilst"))
535
void * new_meta_buffer;
536
uint32_t new_meta_size;
537
if (!create_meta(data,&new_meta_buffer,&new_meta_size)) return 0;
539
buf = membuffer_create();
540
mp4ff_set_position(f,total_base);
541
membuffer_transfer_from_file(buf,f,(uint32_t)(udta_offset - total_base));
543
membuffer_write_int32(buf,udta_size + 8 + new_meta_size);
544
membuffer_write_atom_name(buf,"udta");
545
membuffer_transfer_from_file(buf,f,udta_size);
547
membuffer_write_atom(buf,"meta",new_meta_size,new_meta_buffer);
548
free(new_meta_buffer);
550
*out_size = membuffer_get_size(buf);
551
*out_buffer = membuffer_detach(buf);
555
meta_offset = mp4ff_position(f);
556
meta_size = mp4ff_read_int32(f);
557
if (!find_atom(f,meta_offset+12,meta_size-12,"ilst")) return 0;//shouldn't happen, find_atom_v2 above takes care of it
558
ilst_offset = mp4ff_position(f);
559
ilst_size = mp4ff_read_int32(f);
561
if (!create_ilst(data,&new_ilst_buffer,&new_ilst_size)) return 0;
563
size_delta = new_ilst_size - (ilst_size - 8);
565
*out_size = total_size + size_delta;
566
*out_buffer = malloc(*out_size);
567
if (*out_buffer == 0)
569
free(new_ilst_buffer);
573
p_out = (uint8_t*)*out_buffer;
575
mp4ff_set_position(f,total_base);
576
mp4ff_read_data(f,p_out,(uint32_t)(udta_offset - total_base )); p_out += (uint32_t)(udta_offset - total_base );
577
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
578
mp4ff_read_data(f,p_out,4); p_out += 4;
579
mp4ff_read_data(f,p_out,(uint32_t)(meta_offset - udta_offset - 8)); p_out += (uint32_t)(meta_offset - udta_offset - 8);
580
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
581
mp4ff_read_data(f,p_out,4); p_out += 4;
582
mp4ff_read_data(f,p_out,(uint32_t)(ilst_offset - meta_offset - 8)); p_out += (uint32_t)(ilst_offset - meta_offset - 8);
583
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
584
mp4ff_read_data(f,p_out,4); p_out += 4;
586
memcpy(p_out,new_ilst_buffer,new_ilst_size);
587
p_out += new_ilst_size;
589
mp4ff_set_position(f,ilst_offset + ilst_size);
590
mp4ff_read_data(f,p_out,(uint32_t)(total_size - (ilst_offset - total_base) - ilst_size));
592
free(new_ilst_buffer);
598
int32_t mp4ff_meta_update(mp4ff_callback_t *f,const mp4ff_metadata_t * data)
600
void * new_moov_data;
601
uint32_t new_moov_size;
603
mp4ff_t *ff = malloc(sizeof(mp4ff_t));
605
memset(ff, 0, sizeof(mp4ff_t));
607
mp4ff_set_position(ff,0);
612
if (!modify_moov(ff,data,&new_moov_data,&new_moov_size))
618
/* copy moov atom to end of the file */
619
if (ff->last_atom != ATOM_MOOV)
621
char *free_data = "free";
623
/* rename old moov to free */
624
mp4ff_set_position(ff, ff->moov_offset + 4);
625
mp4ff_write_data(ff, free_data, 4);
627
mp4ff_set_position(ff, ff->file_size);
628
mp4ff_write_int32(ff,new_moov_size + 8);
629
mp4ff_write_data(ff,"moov",4);
630
mp4ff_write_data(ff, new_moov_data, new_moov_size);
634
mp4ff_set_position(ff, ff->moov_offset);
635
mp4ff_write_int32(ff,new_moov_size + 8);
636
mp4ff_write_data(ff,"moov",4);
637
mp4ff_write_data(ff, new_moov_data, new_moov_size);