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mp4tagupdate.c

#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[] = 
{
      {"\xA9" "nam","title"},
      {"\xA9" "ART","artist"},
      {"\xA9" "wrt","writer"},
      {"\xA9" "alb","album"},
      {"\xA9" "day","date"},
      {"\xA9" "too","tool"},
      {"\xA9" "cmt","comment"},
//    {"\xA9" "gen","genre"},
      {"cpil","compilation"},
//    {"trkn","track"},
//    {"disk","disc"},
//    {"gnre","genre"},
      {"covr","cover"},
      /* added by AJS */
      {"aART","album_artist"},
};


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)
{
      /* added by AJS */
      uint32_t flags = 1;

      /* special check for compilation flag */
      if ( strcmp(name, "cpil") == 0)
      {
            flags = 21;
      }

      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,flags);//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,"ęgen",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"))
            {
                  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,1);


      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

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