#include <stdlib.h>
#include <string.h>
#include "mp4ffint.h"
#ifdef USE_TAGGING
static uint32_t fix_byte_order_32(uint32_t src)
{
uint32_t result;
uint32_t a, b, c, d;
int8_t data[4];
memcpy(data,&src,sizeof(src));
a = (uint8_t)data[0];
b = (uint8_t)data[1];
c = (uint8_t)data[2];
d = (uint8_t)data[3];
result = (a<<24) | (b<<16) | (c<<8) | d;
return (uint32_t)result;
}
static uint16_t fix_byte_order_16(uint16_t src)
{
uint16_t result;
uint16_t a, b;
int8_t data[2];
memcpy(data,&src,sizeof(src));
a = (uint8_t)data[0];
b = (uint8_t)data[1];
result = (a<<8) | b;
return (uint16_t)result;
}
typedef struct
{
void * data;
unsigned written;
unsigned allocated;
unsigned error;
} membuffer;
unsigned membuffer_write(membuffer * buf,const void * ptr,unsigned bytes)
{
unsigned dest_size = buf->written + bytes;
if (buf->error) return 0;
if (dest_size > buf->allocated)
{
do
{
buf->allocated <<= 1;
} while(dest_size > buf->allocated);
{
void * newptr = realloc(buf->data,buf->allocated);
if (newptr==0)
{
free(buf->data);
buf->data = 0;
buf->error = 1;
return 0;
}
buf->data = newptr;
}
}
if (ptr) memcpy((char*)buf->data + buf->written,ptr,bytes);
buf->written += bytes;
return bytes;
}
#define membuffer_write_data membuffer_write
unsigned membuffer_write_int32(membuffer * buf,uint32_t data)
{
uint8_t temp[4] = {(uint8_t)(data>>24),(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
return membuffer_write_data(buf,temp,4);
}
unsigned membuffer_write_int24(membuffer * buf,uint32_t data)
{
uint8_t temp[3] = {(uint8_t)(data>>16),(uint8_t)(data>>8),(uint8_t)data};
return membuffer_write_data(buf,temp,3);
}
unsigned membuffer_write_int16(membuffer * buf,uint16_t data)
{
uint8_t temp[2] = {(uint8_t)(data>>8),(uint8_t)data};
return membuffer_write_data(buf,temp,2);
}
unsigned membuffer_write_atom_name(membuffer * buf,const char * data)
{
return membuffer_write_data(buf,data,4)==4 ? 1 : 0;
}
void membuffer_write_atom(membuffer * buf,const char * name,unsigned size,const void * data)
{
membuffer_write_int32(buf,size + 8);
membuffer_write_atom_name(buf,name);
membuffer_write_data(buf,data,size);
}
unsigned membuffer_write_string(membuffer * buf,const char * data)
{
return membuffer_write_data(buf,data,strlen(data));
}
unsigned membuffer_write_int8(membuffer * buf,uint8_t data)
{
return membuffer_write_data(buf,&data,1);
}
void * membuffer_get_ptr(const membuffer * buf)
{
return buf->data;
}
unsigned membuffer_get_size(const membuffer * buf)
{
return buf->written;
}
unsigned membuffer_error(const membuffer * buf)
{
return buf->error;
}
void membuffer_set_error(membuffer * buf) {buf->error = 1;}
unsigned membuffer_transfer_from_file(membuffer * buf,mp4ff_t * src,unsigned bytes)
{
unsigned oldsize;
void * bufptr;
oldsize = membuffer_get_size(buf);
if (membuffer_write_data(buf,0,bytes) != bytes) return 0;
bufptr = membuffer_get_ptr(buf);
if (bufptr==0) return 0;
if ((unsigned)mp4ff_read_data(src,(char*)bufptr + oldsize,bytes)!=bytes)
{
membuffer_set_error(buf);
return 0;
}
return bytes;
}
membuffer * membuffer_create()
{
const unsigned initial_size = 256;
membuffer * buf = (membuffer *) malloc(sizeof(membuffer));
buf->data = malloc(initial_size);
buf->written = 0;
buf->allocated = initial_size;
buf->error = buf->data == 0 ? 1 : 0;
return buf;
}
void membuffer_free(membuffer * buf)
{
if (buf->data) free(buf->data);
free(buf);
}
void * membuffer_detach(membuffer * buf)
{
void * ret;
if (buf->error) return 0;
ret = realloc(buf->data,buf->written);
if (ret == 0) free(buf->data);
buf->data = 0;
buf->error = 1;
return ret;
}
#if 0
/* metadata tag structure */
typedef struct
{
char *item;
char *value;
} mp4ff_tag_t;
/* metadata list structure */
typedef struct
{
mp4ff_tag_t *tags;
uint32_t count;
} mp4ff_metadata_t;
#endif
typedef struct
{
const char * atom;
const char * name;
} stdmeta_entry;
static stdmeta_entry stdmetas[] =
{
{"�nam","title"},
{"�ART","artist"},
{"�wrt","writer"},
{"�alb","album"},
{"�day","date"},
{"�too","tool"},
{"�cmt","comment"},
// {"�gen","genre"},
{"cpil","compilation"},
// {"trkn","track"},
// {"disk","disc"},
// {"gnre","genre"},
{"covr","cover"},
};
static const char* find_standard_meta(const char * name) //returns atom name if found, 0 if not
{
unsigned n;
for(n=0;n<sizeof(stdmetas)/sizeof(stdmetas[0]);n++)
{
if (!stricmp(name,stdmetas[n].name)) return stdmetas[n].atom;
}
return 0;
}
static void membuffer_write_track_tag(membuffer * buf,const char * name,uint32_t index,uint32_t total)
{
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
membuffer_write_atom_name(buf,name);
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 8 /*actual data*/ );
membuffer_write_atom_name(buf,"data");
membuffer_write_int32(buf,0);//flags
membuffer_write_int32(buf,0);//reserved
membuffer_write_int16(buf,0);
membuffer_write_int16(buf,(uint16_t)index);//track number
membuffer_write_int16(buf,(uint16_t)total);//total tracks
membuffer_write_int16(buf,0);
}
static void membuffer_write_int16_tag(membuffer * buf,const char * name,uint16_t value)
{
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
membuffer_write_atom_name(buf,name);
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + 2 /*actual data*/ );
membuffer_write_atom_name(buf,"data");
membuffer_write_int32(buf,0);//flags
membuffer_write_int32(buf,0);//reserved
membuffer_write_int16(buf,value);//value
}
static void membuffer_write_std_tag(membuffer * buf,const char * name,const char * value)
{
membuffer_write_int32(buf,8 /*atom header*/ + 8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value) );
membuffer_write_atom_name(buf,name);
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
membuffer_write_atom_name(buf,"data");
membuffer_write_int32(buf,1);//flags
membuffer_write_int32(buf,0);//reserved
membuffer_write_data(buf,value,strlen(value));
}
static void membuffer_write_custom_tag(membuffer * buf,const char * name,const char * value)
{
membuffer_write_int32(buf,8 /*atom header*/ + 0x1C /*weirdo itunes atom*/ + 12 /*name atom header*/ + strlen(name) + 16 /*data atom header + flags*/ + strlen(value) );
membuffer_write_atom_name(buf,"----");
membuffer_write_int32(buf,0x1C);//weirdo itunes atom
membuffer_write_atom_name(buf,"mean");
membuffer_write_int32(buf,0);
membuffer_write_data(buf,"com.apple.iTunes",16);
membuffer_write_int32(buf,12 + strlen(name));
membuffer_write_atom_name(buf,"name");
membuffer_write_int32(buf,0);
membuffer_write_data(buf,name,strlen(name));
membuffer_write_int32(buf,8 /*data atom header*/ + 8 /*flags + reserved*/ + strlen(value));
membuffer_write_atom_name(buf,"data");
membuffer_write_int32(buf,1);//flags
membuffer_write_int32(buf,0);//reserved
membuffer_write_data(buf,value,strlen(value));
}
static uint32_t myatoi(const char * param)
{
return param ? atoi(param) : 0;
}
static uint32_t create_ilst(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
{
membuffer * buf = membuffer_create();
unsigned metaptr;
char * mask = (char*)malloc(data->count);
memset(mask,0,data->count);
{
const char * tracknumber_ptr = 0, * totaltracks_ptr = 0;
const char * discnumber_ptr = 0, * totaldiscs_ptr = 0;
const char * genre_ptr = 0, * tempo_ptr = 0;
for(metaptr = 0; metaptr < data->count; metaptr++)
{
mp4ff_tag_t * tag = &data->tags[metaptr];
if (!stricmp(tag->item,"tracknumber") || !stricmp(tag->item,"track"))
{
if (tracknumber_ptr==0) tracknumber_ptr = tag->value;
mask[metaptr] = 1;
}
else if (!stricmp(tag->item,"totaltracks"))
{
if (totaltracks_ptr==0) totaltracks_ptr = tag->value;
mask[metaptr] = 1;
}
else if (!stricmp(tag->item,"discnumber") || !stricmp(tag->item,"disc"))
{
if (discnumber_ptr==0) discnumber_ptr = tag->value;
mask[metaptr] = 1;
}
else if (!stricmp(tag->item,"totaldiscs"))
{
if (totaldiscs_ptr==0) totaldiscs_ptr = tag->value;
mask[metaptr] = 1;
}
else if (!stricmp(tag->item,"genre"))
{
if (genre_ptr==0) genre_ptr = tag->value;
mask[metaptr] = 1;
}
else if (!stricmp(tag->item,"tempo"))
{
if (tempo_ptr==0) tempo_ptr = tag->value;
mask[metaptr] = 1;
}
}
if (tracknumber_ptr) membuffer_write_track_tag(buf,"trkn",myatoi(tracknumber_ptr),myatoi(totaltracks_ptr));
if (discnumber_ptr) membuffer_write_track_tag(buf,"disk",myatoi(discnumber_ptr),myatoi(totaldiscs_ptr));
if (tempo_ptr) membuffer_write_int16_tag(buf,"tmpo",(uint16_t)myatoi(tempo_ptr));
if (genre_ptr)
{
uint32_t index = mp4ff_meta_genre_to_index(genre_ptr);
if (index==0)
membuffer_write_std_tag(buf,"�gen",genre_ptr);
else
membuffer_write_int16_tag(buf,"gnre",(uint16_t)index);
}
}
for(metaptr = 0; metaptr < data->count; metaptr++)
{
if (!mask[metaptr])
{
mp4ff_tag_t * tag = &data->tags[metaptr];
const char * std_meta_atom = find_standard_meta(tag->item);
if (std_meta_atom)
{
membuffer_write_std_tag(buf,std_meta_atom,tag->value);
}
else
{
membuffer_write_custom_tag(buf,tag->item,tag->value);
}
}
}
free(mask);
if (membuffer_error(buf))
{
membuffer_free(buf);
return 0;
}
*out_size = membuffer_get_size(buf);
*out_buffer = membuffer_detach(buf);
membuffer_free(buf);
return 1;
}
static uint32_t find_atom(mp4ff_t * f,uint64_t base,uint32_t size,const char * name)
{
uint32_t remaining = size;
uint64_t atom_offset = base;
for(;;)
{
char atom_name[4];
uint32_t atom_size;
mp4ff_set_position(f,atom_offset);
if (remaining < 8) break;
atom_size = mp4ff_read_int32(f);
if (atom_size > remaining || atom_size < 8) break;
mp4ff_read_data(f,atom_name,4);
if (!memcmp(atom_name,name,4))
{
mp4ff_set_position(f,atom_offset);
return 1;
}
remaining -= atom_size;
atom_offset += atom_size;
}
return 0;
}
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)
{
uint64_t first_base = (uint64_t)(-1);
while(find_atom(f,base,size,name))//try to find atom <name> with atom <name_inside> in it
{
uint64_t mybase = mp4ff_position(f);
uint32_t mysize = mp4ff_read_int32(f);
if (first_base == (uint64_t)(-1)) first_base = mybase;
if (mysize < 8 + extraheaders) break;
if (find_atom(f,mybase+(8+extraheaders),mysize-(8+extraheaders),name_inside))
{
mp4ff_set_position(f,mybase);
return 2;
}
base += mysize;
if (size<=mysize) {size=0;break;}
size -= mysize;
}
if (first_base != (uint64_t)(-1))//wanted atom inside not found
{
mp4ff_set_position(f,first_base);
return 1;
}
else return 0;
}
static uint32_t create_meta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
{
membuffer * buf;
uint32_t ilst_size;
void * ilst_buffer;
if (!create_ilst(data,&ilst_buffer,&ilst_size)) return 0;
buf = membuffer_create();
membuffer_write_int32(buf,0);
membuffer_write_atom(buf,"ilst",ilst_size,ilst_buffer);
free(ilst_buffer);
*out_size = membuffer_get_size(buf);
*out_buffer = membuffer_detach(buf);
membuffer_free(buf);
return 1;
}
static uint32_t create_udta(const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
{
membuffer * buf;
uint32_t meta_size;
void * meta_buffer;
if (!create_meta(data,&meta_buffer,&meta_size)) return 0;
buf = membuffer_create();
membuffer_write_atom(buf,"meta",meta_size,meta_buffer);
free(meta_buffer);
*out_size = membuffer_get_size(buf);
*out_buffer = membuffer_detach(buf);
membuffer_free(buf);
return 1;
}
static uint32_t modify_moov(mp4ff_t * f,const mp4ff_metadata_t * data,void ** out_buffer,uint32_t * out_size)
{
uint64_t total_base = f->moov_offset + 8;
uint32_t total_size = (uint32_t)(f->moov_size - 8);
uint64_t udta_offset,meta_offset,ilst_offset;
uint32_t udta_size, meta_size, ilst_size;
uint32_t new_ilst_size;
void * new_ilst_buffer;
uint8_t * p_out;
int32_t size_delta;
if (!find_atom_v2(f,total_base,total_size,"udta",0,"meta"))
{
membuffer * buf;
void * new_udta_buffer;
uint32_t new_udta_size;
if (!create_udta(data,&new_udta_buffer,&new_udta_size)) return 0;
buf = membuffer_create();
mp4ff_set_position(f,total_base);
membuffer_transfer_from_file(buf,f,total_size);
membuffer_write_atom(buf,"udta",new_udta_size,new_udta_buffer);
free(new_udta_buffer);
*out_size = membuffer_get_size(buf);
*out_buffer = membuffer_detach(buf);
membuffer_free(buf);
return 1;
}
else
{
udta_offset = mp4ff_position(f);
udta_size = mp4ff_read_int32(f);
if (find_atom_v2(f,udta_offset+8,udta_size-8,"meta",4,"ilst")<2)
{
membuffer * buf;
void * new_meta_buffer;
uint32_t new_meta_size;
if (!create_meta(data,&new_meta_buffer,&new_meta_size)) return 0;
buf = membuffer_create();
mp4ff_set_position(f,total_base);
membuffer_transfer_from_file(buf,f,(uint32_t)(udta_offset - total_base));
membuffer_write_int32(buf,udta_size + 8 + new_meta_size);
membuffer_write_atom_name(buf,"udta");
membuffer_transfer_from_file(buf,f,udta_size);
membuffer_write_atom(buf,"meta",new_meta_size,new_meta_buffer);
free(new_meta_buffer);
*out_size = membuffer_get_size(buf);
*out_buffer = membuffer_detach(buf);
membuffer_free(buf);
return 1;
}
meta_offset = mp4ff_position(f);
meta_size = mp4ff_read_int32(f);
if (!find_atom(f,meta_offset+12,meta_size-12,"ilst")) return 0;//shouldn't happen, find_atom_v2 above takes care of it
ilst_offset = mp4ff_position(f);
ilst_size = mp4ff_read_int32(f);
if (!create_ilst(data,&new_ilst_buffer,&new_ilst_size)) return 0;
size_delta = new_ilst_size - (ilst_size - 8);
*out_size = total_size + size_delta;
*out_buffer = malloc(*out_size);
if (*out_buffer == 0)
{
free(new_ilst_buffer);
return 0;
}
p_out = (uint8_t*)*out_buffer;
mp4ff_set_position(f,total_base);
mp4ff_read_data(f,p_out,(uint32_t)(udta_offset - total_base )); p_out += (uint32_t)(udta_offset - total_base );
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
mp4ff_read_data(f,p_out,4); p_out += 4;
mp4ff_read_data(f,p_out,(uint32_t)(meta_offset - udta_offset - 8)); p_out += (uint32_t)(meta_offset - udta_offset - 8);
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
mp4ff_read_data(f,p_out,4); p_out += 4;
mp4ff_read_data(f,p_out,(uint32_t)(ilst_offset - meta_offset - 8)); p_out += (uint32_t)(ilst_offset - meta_offset - 8);
*(uint32_t*)p_out = fix_byte_order_32(mp4ff_read_int32(f) + size_delta); p_out += 4;
mp4ff_read_data(f,p_out,4); p_out += 4;
memcpy(p_out,new_ilst_buffer,new_ilst_size);
p_out += new_ilst_size;
mp4ff_set_position(f,ilst_offset + ilst_size);
mp4ff_read_data(f,p_out,(uint32_t)(total_size - (ilst_offset - total_base) - ilst_size));
free(new_ilst_buffer);
}
return 1;
}
int32_t mp4ff_meta_update(mp4ff_callback_t *f,const mp4ff_metadata_t * data)
{
void * new_moov_data;
uint32_t new_moov_size;
mp4ff_t *ff = malloc(sizeof(mp4ff_t));
memset(ff, 0, sizeof(mp4ff_t));
ff->stream = f;
mp4ff_set_position(ff,0);
parse_atoms(ff);
if (!modify_moov(ff,data,&new_moov_data,&new_moov_size))
{
mp4ff_close(ff);
return 0;
}
/* copy moov atom to end of the file */
if (ff->last_atom != ATOM_MOOV)
{
char *free_data = "free";
/* rename old moov to free */
mp4ff_set_position(ff, ff->moov_offset + 4);
mp4ff_write_data(ff, free_data, 4);
mp4ff_set_position(ff, ff->file_size);
mp4ff_write_int32(ff,new_moov_size + 8);
mp4ff_write_data(ff,"moov",4);
mp4ff_write_data(ff, new_moov_data, new_moov_size);
}
else
{
mp4ff_set_position(ff, ff->moov_offset);
mp4ff_write_int32(ff,new_moov_size + 8);
mp4ff_write_data(ff,"moov",4);
mp4ff_write_data(ff, new_moov_data, new_moov_size);
}
mp4ff_truncate(ff);
mp4ff_close(ff);
return 1;
}
#endif
