int32_t mp4ff_parse_tag(mp4ff_t *f, const uint8_t parent_atom_type, const int32_t size)
{
uint8_t atom_type;
uint8_t header_size = 0;
uint64_t subsize, sumsize = 0;
char * name = NULL;
char * data = NULL;
uint32_t done = 0;
while (sumsize < size)
{
uint64_t destpos;
subsize = mp4ff_atom_read_header(f, &atom_type, &header_size);
destpos = mp4ff_position(f)+subsize-header_size;
if (!done)
{
if (atom_type == ATOM_DATA)
{
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
mp4ff_read_int32(f); /* reserved */
/* some need special attention */
if (parent_atom_type == ATOM_GENRE2 || parent_atom_type == ATOM_TEMPO)
{
if (subsize - header_size >= 8 + 2)
{
uint16_t val = mp4ff_read_int16(f);
if (parent_atom_type == ATOM_TEMPO)
{
char temp[16];
sprintf(temp, "%.5u BPM", val);
mp4ff_tag_add_field(&(f->tags), "tempo", temp);
}
else
{
const char * temp = mp4ff_meta_index_to_genre(val);
if (temp)
{
mp4ff_tag_add_field(&(f->tags), "genre", temp);
}
}
done = 1;
}
} else if (parent_atom_type == ATOM_TRACK || parent_atom_type == ATOM_DISC) {
/* if (!done && subsize - header_size >= 8 + 8) */
/* modified by AJS */
if ( !done && (subsize - header_size) >=
(sizeof(char) + sizeof(uint8_t)*3 + sizeof(uint32_t) + /* version + flags + reserved */
+ sizeof(uint16_t) /* leading uint16_t */
+ sizeof(uint16_t) /* track / disc */
+ sizeof(uint16_t)) /* totaltracks / totaldiscs */
)
{
uint16_t index,total;
char temp[32];
mp4ff_read_int16(f);
index = mp4ff_read_int16(f);
total = mp4ff_read_int16(f);
/* modified by AJS */
/* mp4ff_read_int16(f); */
sprintf(temp,"%d",index);
mp4ff_tag_add_field(&(f->tags), parent_atom_type == ATOM_TRACK ? "track" : "disc", temp);
if (total>0)
{
sprintf(temp,"%d",total);
mp4ff_tag_add_field(&(f->tags), parent_atom_type == ATOM_TRACK ? "totaltracks" : "totaldiscs", temp);
}
done = 1;
}
} else if (parent_atom_type == ATOM_COVER) {
if (data)
{
free(data);
data = NULL;
}
if (f->load_covers)
{
uint32_t datasize = (uint32_t)(subsize-(header_size+8));
data = malloc(datasize);
if (!data) {
// allocation error
}
else if (datasize != mp4ff_read_data(f, data, datasize))
{
free (data);
data = NULL;
}
else
{
mp4ff_cover_append_item (f, data, datasize);
data = NULL;
}
}
} else
{
if (data) {free(data);data = NULL;}
data = mp4ff_read_string(f,(uint32_t)(subsize-(header_size+8)));
}
} else if (atom_type == ATOM_NAME) {
if (!done)
{
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
if (name) free(name);
name = mp4ff_read_string(f,(uint32_t)(subsize-(header_size+4)));
}
}
mp4ff_set_position(f, destpos);
sumsize += subsize;
}
}
if (data)
{
if (!done)
{
if (name == NULL) mp4ff_set_metadata_name(f, parent_atom_type, &name);
if (name) mp4ff_tag_add_field(&(f->tags), name, data);
}
free(data);
}
if (name) free(name);
return 1;
}
static int32_t mp4ff_read_esds(mp4ff_t *f)
{
uint8_t tag;
uint32_t temp;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
/* get and verify ES_DescrTag */
tag = mp4ff_read_char(f);
if (tag == 0x03)
{
/* read length */
if (mp4ff_read_mp4_descr_length(f) < 5 + 15)
{
return 1;
}
/* skip 3 bytes */
mp4ff_read_int24(f);
} else {
/* skip 2 bytes */
mp4ff_read_int16(f);
}
/* get and verify DecoderConfigDescrTab */
if (mp4ff_read_char(f) != 0x04)
{
return 1;
}
/* read length */
temp = mp4ff_read_mp4_descr_length(f);
if (temp < 13) return 1;
f->track[f->total_tracks - 1]->audioType = mp4ff_read_char(f);
mp4ff_read_int32(f);//0x15000414 ????
f->track[f->total_tracks - 1]->maxBitrate = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->avgBitrate = mp4ff_read_int32(f);
/* get and verify DecSpecificInfoTag */
if (mp4ff_read_char(f) != 0x05)
{
return 1;
}
/* read length */
f->track[f->total_tracks - 1]->decoderConfigLen = mp4ff_read_mp4_descr_length(f);
if (f->track[f->total_tracks - 1]->decoderConfig)
free(f->track[f->total_tracks - 1]->decoderConfig);
f->track[f->total_tracks - 1]->decoderConfig = malloc(f->track[f->total_tracks - 1]->decoderConfigLen);
if (f->track[f->total_tracks - 1]->decoderConfig)
{
mp4ff_read_data(f, f->track[f->total_tracks - 1]->decoderConfig, f->track[f->total_tracks - 1]->decoderConfigLen);
} else {
f->track[f->total_tracks - 1]->decoderConfigLen = 0;
}
/* will skip the remainder of the atom */
return 0;
}