ZLKMedia/3rdpart/media-server/libmov/source/mov-trex.c

#include "mov-internal.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>

// 8.8.3 Track Extends Box (p69)
int mov_read_trex(struct mov_t* mov, const struct mov_box_t* box)
{
	uint32_t track_ID;
	struct mov_track_t* track;

	(void)box;
	mov_buffer_r32(&mov->io); /* version & flags */
	track_ID = mov_buffer_r32(&mov->io); /* track_ID */

	track = mov_fetch_track(mov, track_ID);
    if (NULL == track) return -1;

	track->trex.default_sample_description_index = mov_buffer_r32(&mov->io); /* default_sample_description_index */
	track->trex.default_sample_duration = mov_buffer_r32(&mov->io); /* default_sample_duration */
	track->trex.default_sample_size = mov_buffer_r32(&mov->io); /* default_sample_size */
	track->trex.default_sample_flags = mov_buffer_r32(&mov->io); /* default_sample_flags */
	return mov_buffer_error(&mov->io);
}

size_t mov_write_trex(const struct mov_t* mov)
{
	mov_buffer_w32(&mov->io, 12 + 20); /* size */
	mov_buffer_write(&mov->io, "trex", 4);
	mov_buffer_w32(&mov->io, 0); /* version & flags */
	mov_buffer_w32(&mov->io, mov->track->tkhd.track_ID); /* track_ID */
	mov_buffer_w32(&mov->io, 1); /* default_sample_description_index */
	mov_buffer_w32(&mov->io, 0); /* default_sample_duration */
	mov_buffer_w32(&mov->io, 0); /* default_sample_size */
	mov_buffer_w32(&mov->io, 0); /* default_sample_flags */
	return 32;
}