74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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#include "mov-internal.h"
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#include <assert.h>
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// 8.16.3 Segment Index Box (p119)
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int mov_read_sidx(struct mov_t* mov, const struct mov_box_t* box)
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{
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unsigned int version;
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unsigned int i, reference_count;
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version = mov_buffer_r8(&mov->io); /* version */
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mov_buffer_r24(&mov->io); /* flags */
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mov_buffer_r32(&mov->io); /* reference_ID */
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mov_buffer_r32(&mov->io); /* timescale */
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if (0 == version)
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{
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mov_buffer_r32(&mov->io); /* earliest_presentation_time */
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mov_buffer_r32(&mov->io); /* first_offset */
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}
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else
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{
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mov_buffer_r64(&mov->io); /* earliest_presentation_time */
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mov_buffer_r64(&mov->io); /* first_offset */
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}
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mov_buffer_r16(&mov->io); /* reserved */
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reference_count = mov_buffer_r16(&mov->io); /* reference_count */
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for (i = 0; i < reference_count; i++)
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{
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mov_buffer_r32(&mov->io); /* reference_type & referenced_size */
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mov_buffer_r32(&mov->io); /* subsegment_duration */
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mov_buffer_r32(&mov->io); /* starts_with_SAP & SAP_type & SAP_delta_time */
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}
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(void)box;
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return mov_buffer_error(&mov->io);
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}
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size_t mov_write_sidx(const struct mov_t* mov, uint64_t offset)
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{
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uint32_t duration;
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uint64_t earliest_presentation_time;
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const struct mov_track_t* track = mov->track;
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if (track->sample_count > 0)
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{
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earliest_presentation_time = track->samples[0].pts;
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duration = (uint32_t)(track->samples[track->sample_count - 1].dts - track->samples[0].dts) + (uint32_t)track->turn_last_duration;
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}
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else
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{
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duration = 0;
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earliest_presentation_time = 0;
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}
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mov_buffer_w32(&mov->io, 52); /* size */
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mov_buffer_write(&mov->io, "sidx", 4);
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mov_buffer_w8(&mov->io, 1); /* version */
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mov_buffer_w24(&mov->io, 0); /* flags */
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mov_buffer_w32(&mov->io, track->tkhd.track_ID); /* reference_ID */
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mov_buffer_w32(&mov->io, track->mdhd.timescale); /* timescale */
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mov_buffer_w64(&mov->io, earliest_presentation_time); /* earliest_presentation_time */
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mov_buffer_w64(&mov->io, offset); /* first_offset */
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mov_buffer_w16(&mov->io, 0); /* reserved */
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mov_buffer_w16(&mov->io, 1); /* reference_count */
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mov_buffer_w32(&mov->io, 0); /* reference_type & referenced_size */
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mov_buffer_w32(&mov->io, duration); /* subsegment_duration */
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mov_buffer_w32(&mov->io, (1U/*starts_with_SAP*/ << 31) | (1 /*SAP_type*/ << 28) | 0 /*SAP_delta_time*/);
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return 52;
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}
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