// 8.7.3.2 Sample Size Box (p57)
int mov_read_stsz(struct mov_t* mov, const struct mov_box_t* box)
{
uint32_t i = 0, sample_size, sample_count;
struct mov_track_t* track = mov->track;
mov_buffer_r8(&mov->io); /* version */
mov_buffer_r24(&mov->io); /* flags */
sample_size = mov_buffer_r32(&mov->io);
sample_count = mov_buffer_r32(&mov->io);
assert(0 == track->sample_count && NULL == track->samples); // duplicated STSZ atom
if (track->sample_count < sample_count)
{
void* p = malloc(sizeof(struct mov_sample_t) * (sample_count + 1));
if (NULL == p) return ENOMEM;
track->samples = (struct mov_sample_t*)p;
}
track->sample_count = sample_count;
if (0 == sample_size)
{
for (i = 0; i < sample_count; i++)
track->samples[i].bytes = mov_buffer_r32(&mov->io); // uint32_t entry_size
}
else
{
for (i = 0; i < sample_count; i++)
track->samples[i].bytes = sample_size;
}
(void)box;
return mov_buffer_error(&mov->io);
}
// 8.6.1.2 Decoding Time to Sample Box (p47)
int mov_read_stts(struct mov_t* mov, const struct mov_box_t* box)
{
uint32_t i, entry_count;
struct mov_stbl_t* stbl = &mov->track->stbl;
mov_buffer_r8(&mov->io); /* version */
mov_buffer_r24(&mov->io); /* flags */
entry_count = mov_buffer_r32(&mov->io);
assert(0 == stbl->stts_count && NULL == stbl->stts); // duplicated STTS atom
if (stbl->stts_count < entry_count)
{
void* p = realloc(stbl->stts, sizeof(struct mov_stts_t) * entry_count);
if (NULL == p) return ENOMEM;
stbl->stts = (struct mov_stts_t*)p;
}
stbl->stts_count = entry_count;
for (i = 0; i < entry_count; i++)
{
stbl->stts[i].sample_count = mov_buffer_r32(&mov->io);
stbl->stts[i].sample_delta = mov_buffer_r32(&mov->io);
}
(void)box;
return mov_buffer_error(&mov->io);
}
// 8.6.1.4 Composition to Decode Box (p53)
int mov_read_cslg(struct mov_t* mov, const struct mov_box_t* box)
{
uint8_t version;
// struct mov_stbl_t* stbl = &mov->track->stbl;
version = (uint8_t)mov_buffer_r8(&mov->io); /* version */
mov_buffer_r24(&mov->io); /* flags */
if (0 == version)
{
(int32_t)mov_buffer_r32(&mov->io); /* compositionToDTSShift */
(int32_t)mov_buffer_r32(&mov->io); /* leastDecodeToDisplayDelta */
(int32_t)mov_buffer_r32(&mov->io); /* greatestDecodeToDisplayDelta */
(int32_t)mov_buffer_r32(&mov->io); /* compositionStartTime */
(int32_t)mov_buffer_r32(&mov->io); /* compositionEndTime */
}
else
{
(int64_t)mov_buffer_r64(&mov->io);
(int64_t)mov_buffer_r64(&mov->io);
(int64_t)mov_buffer_r64(&mov->io);
(int64_t)mov_buffer_r64(&mov->io);
(int64_t)mov_buffer_r64(&mov->io);
}
(void)box;
return mov_buffer_error(&mov->io);
}
// 8.8.2 Movie Extends Header Box (p68)
int mov_read_mehd(struct mov_t* mov, const struct mov_box_t* box)
{
unsigned int version;
uint64_t fragment_duration;
version = mov_buffer_r8(&mov->io); /* version */
mov_buffer_r24(&mov->io); /* flags */
if (1 == version)
fragment_duration = mov_buffer_r64(&mov->io); /* fragment_duration*/
else
fragment_duration = mov_buffer_r32(&mov->io); /* fragment_duration*/
(void)box;
assert(fragment_duration <= mov->mvhd.duration);
return mov_buffer_error(&mov->io);
}
// 8.7.3.3 Compact Sample Size Box (p57)
int mov_read_stz2(struct mov_t* mov, const struct mov_box_t* box)
{
uint32_t i, v, field_size, sample_count;
struct mov_track_t* track = mov->track;
mov_buffer_r8(&mov->io); /* version */
mov_buffer_r24(&mov->io); /* flags */
// unsigned int(24) reserved = 0;
mov_buffer_r24(&mov->io); /* reserved */
field_size = mov_buffer_r8(&mov->io);
sample_count = mov_buffer_r32(&mov->io);
assert(4 == field_size || 8 == field_size || 16 == field_size);
assert(0 == track->sample_count && NULL == track->samples); // duplicated STSZ atom
if (track->sample_count < sample_count)
{
void* p = malloc(sizeof(struct mov_sample_t) * (sample_count + 1));
if (NULL == p) return ENOMEM;
track->samples = (struct mov_sample_t*)p;
}
track->sample_count = sample_count;
if (4 == field_size)
{
for (i = 0; i < sample_count/2; i++)
{
v = mov_buffer_r8(&mov->io);
track->samples[i * 2].bytes = (v >> 4) & 0x0F;
track->samples[i * 2 + 1].bytes = v & 0x0F;
}
if (sample_count % 2)
{
v = mov_buffer_r8(&mov->io);
track->samples[i * 2].bytes = (v >> 4) & 0x0F;
}
}