static int32_t mp4ff_read_mdhd(mp4ff_t *f)
{
uint32_t version;
version = mp4ff_read_int32(f);
if (version==1)
{
mp4ff_read_int64(f);//creation-time
mp4ff_read_int64(f);//modification-time
f->track[f->total_tracks - 1]->timeScale = mp4ff_read_int32(f);//timescale
f->track[f->total_tracks - 1]->duration = mp4ff_read_int64(f);//duration
}
else //version == 0
{
uint32_t temp;
mp4ff_read_int32(f);//creation-time
mp4ff_read_int32(f);//modification-time
f->track[f->total_tracks - 1]->timeScale = mp4ff_read_int32(f);//timescale
temp = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->duration = (temp == (uint32_t)(-1)) ? (uint64_t)(-1) : (uint64_t)(temp);
}
mp4ff_read_int16(f);
mp4ff_read_int16(f);
return 1;
}
/* read atom header, return atom size, atom size is with header included */
uint64_t mp4ff_atom_read_header(mp4ff_t *f, uint8_t *atom_type, uint8_t *header_size)
{
uint64_t size;
int32_t ret;
int8_t atom_header[8];
ret = mp4ff_read_data(f, atom_header, 8);
if (ret != 8)
return 0;
size = mp4ff_atom_get_size(atom_header);
*header_size = 8;
/* check for 64 bit atom size */
if (size == 1)
{
*header_size = 16;
size = mp4ff_read_int64(f);
}
//printf("%c%c%c%c\n", atom_header[4], atom_header[5], atom_header[6], atom_header[7]);
*atom_type = mp4ff_atom_name_to_type(atom_header[4], atom_header[5], atom_header[6], atom_header[7]);
return size;
}
static int32_t mp4ff_read_tkhd(mp4ff_t *f)
{
uint8_t version;
uint32_t flags;
version = mp4ff_read_char(f); /* version */
flags = mp4ff_read_int24(f); /* flags */
if (version==1)
{
mp4ff_read_int64(f);//creation-time
mp4ff_read_int64(f);//modification-time
mp4ff_read_int32(f);//track-id
mp4ff_read_int32(f);//reserved
f->track[f->total_tracks - 1]->duration = mp4ff_read_int64(f);//duration
}
else //version == 0
{
mp4ff_read_int32(f);//creation-time
mp4ff_read_int32(f);//modification-time
mp4ff_read_int32(f);//track-id
mp4ff_read_int32(f);//reserved
f->track[f->total_tracks - 1]->duration = mp4ff_read_int32(f);//duration
if (f->track[f->total_tracks - 1]->duration == 0xFFFFFFFF)
f->track[f->total_tracks - 1]->duration = 0xFFFFFFFFFFFFFFFF;
}
mp4ff_read_int32(f);//reserved
mp4ff_read_int32(f);//reserved
mp4ff_read_int16(f);//layer
mp4ff_read_int16(f);//pre-defined
mp4ff_read_int16(f);//volume
mp4ff_read_int16(f);//reserved
//matrix
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);//width
mp4ff_read_int32(f);//height
return 1;
}
static int32_t mp4ff_read_chpl(mp4ff_t *f, const uint64_t size)
{
int i;
int i_read = size;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
mp4ff_chapterdata_t *p_chpl = &f->chapters;
p_chpl->i_chapter = mp4ff_read_char (f);
i_read -= 5;
for( i = 0; i < p_chpl->i_chapter; i++ )
{
uint64_t i_start;
uint8_t i_len;
int i_copy;
i_start = mp4ff_read_int64 (f);
i_read -= 8;
i_len = mp4ff_read_char (f);
i_read -= 1;
p_chpl->chapter[i].psz_name = malloc( i_len + 1 );
if( !p_chpl->chapter[i].psz_name )
goto error;
i_copy = i_len < i_read ? i_len : i_read;
if( i_copy > 0 )
mp4ff_read_data (f, p_chpl->chapter[i].psz_name, i_copy);
p_chpl->chapter[i].psz_name[i_copy] = '\0';
p_chpl->chapter[i].i_start = i_start;
i_read -= i_copy;
}
/* Bubble sort by increasing start date */
do
{
for( i = 0; i < p_chpl->i_chapter - 1; i++ )
{
if( p_chpl->chapter[i].i_start > p_chpl->chapter[i+1].i_start )
{
char *psz = p_chpl->chapter[i+1].psz_name;
int64_t i64 = p_chpl->chapter[i+1].i_start;
p_chpl->chapter[i+1].psz_name = p_chpl->chapter[i].psz_name;
p_chpl->chapter[i+1].i_start = p_chpl->chapter[i].i_start;
p_chpl->chapter[i].psz_name = psz;
p_chpl->chapter[i].i_start = i64;
i = -1;
break;
}
}
} while( i == -1 );
return 0;
error:
return -1;
}
