77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
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#include "mov-internal.h"
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#include <assert.h>
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// 8.4.2 Media Header Box (p35)
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// Box Type: 'mdhd'
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// Container: Media Box ('mdia')
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// Mandatory: Yes
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// Quantity: Exactly one
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/*
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aligned(8) class MediaHeaderBox extends FullBox('mdhd', version, 0) {
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if (version==1) {
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unsigned int(64) creation_time;
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unsigned int(64) modification_time;
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unsigned int(32) timescale;
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unsigned int(64) duration;
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} else { // version==0
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unsigned int(32) creation_time;
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unsigned int(32) modification_time;
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unsigned int(32) timescale;
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unsigned int(32) duration;
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}
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bit(1) pad = 0;
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unsigned int(5)[3] language; // ISO-639-2/T language code
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unsigned int(16) pre_defined = 0;
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}
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*/
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int mov_read_mdhd(struct mov_t* mov, const struct mov_box_t* box)
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{
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uint32_t val;
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struct mov_mdhd_t* mdhd = &mov->track->mdhd;
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mdhd->version = mov_buffer_r8(&mov->io);
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mdhd->flags = mov_buffer_r24(&mov->io);
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if (1 == mdhd->version)
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{
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mdhd->creation_time = mov_buffer_r64(&mov->io);
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mdhd->modification_time = mov_buffer_r64(&mov->io);
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mdhd->timescale = mov_buffer_r32(&mov->io);
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mdhd->duration = mov_buffer_r64(&mov->io);
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}
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else
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{
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assert(0 == mdhd->version);
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mdhd->creation_time = mov_buffer_r32(&mov->io);
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mdhd->modification_time = mov_buffer_r32(&mov->io);
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mdhd->timescale = mov_buffer_r32(&mov->io);
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mdhd->duration = mov_buffer_r32(&mov->io);
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}
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val = mov_buffer_r32(&mov->io);
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mdhd->language = (val >> 16) & 0x7FFF;
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mdhd->pre_defined = val & 0xFFFF;
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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_mdhd(const struct mov_t* mov)
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{
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const struct mov_mdhd_t* mdhd = &mov->track->mdhd;
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mov_buffer_w32(&mov->io, 32); /* size */
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mov_buffer_write(&mov->io, "mdhd", 4);
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mov_buffer_w32(&mov->io, 0); /* version 1 & flags */
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mov_buffer_w32(&mov->io, (uint32_t)mdhd->creation_time); /* creation_time */
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mov_buffer_w32(&mov->io, (uint32_t)mdhd->modification_time); /* modification_time */
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mov_buffer_w32(&mov->io, mdhd->timescale); /* timescale */
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mov_buffer_w32(&mov->io, (uint32_t)mdhd->duration); /* duration */
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mov_buffer_w16(&mov->io, (uint16_t)mdhd->language); /* ISO-639-2/T language code */
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mov_buffer_w16(&mov->io, 0); /* pre_defined (quality) */
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return 32;
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}
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