87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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#include "mov-internal.h"
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#include <errno.h>
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#include <stdlib.h>
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#include <assert.h>
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// 8.7.4 Sample To Chunk Box (p57)
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/*
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aligned(8) class SampleToChunkBox extends FullBox('stsc', version = 0, 0) {
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unsigned int(32) entry_count;
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for (i=1; i <= entry_count; i++) {
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unsigned int(32) first_chunk;
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unsigned int(32) samples_per_chunk;
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unsigned int(32) sample_description_index;
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}
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}
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*/
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int mov_read_stsc(struct mov_t* mov, const struct mov_box_t* box)
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{
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uint32_t i, entry_count;
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struct mov_stbl_t* stbl = &mov->track->stbl;
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mov_buffer_r8(&mov->io); /* version */
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mov_buffer_r24(&mov->io); /* flags */
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entry_count = mov_buffer_r32(&mov->io);
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assert(0 == stbl->stsc_count && NULL == stbl->stsc); // duplicated STSC atom
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if (stbl->stsc_count < entry_count)
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{
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void* p = realloc(stbl->stsc, sizeof(struct mov_stsc_t) * (entry_count + 1/*stco count*/));
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if (NULL == p) return -ENOMEM;
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stbl->stsc = (struct mov_stsc_t*)p;
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}
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stbl->stsc_count = entry_count;
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for (i = 0; i < entry_count; i++)
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{
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stbl->stsc[i].first_chunk = mov_buffer_r32(&mov->io);
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stbl->stsc[i].samples_per_chunk = mov_buffer_r32(&mov->io);
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stbl->stsc[i].sample_description_index = mov_buffer_r32(&mov->io);
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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_stsc(const struct mov_t* mov)
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{
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uint64_t offset;
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uint64_t offset2;
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uint32_t size, i, entry;
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const struct mov_sample_t* chunk = NULL;
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const struct mov_sample_t* sample = NULL;
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const struct mov_track_t* track = mov->track;
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size = 12/* full box */ + 4/* entry count */;
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offset = mov_buffer_tell(&mov->io);
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mov_buffer_w32(&mov->io, 0); /* size */
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mov_buffer_write(&mov->io, "stsc", 4);
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mov_buffer_w32(&mov->io, 0); /* version & flags */
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mov_buffer_w32(&mov->io, 0); /* entry count */
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for (i = 0, entry = 0; i < track->sample_count; i++)
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{
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sample = &track->samples[i];
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if (0 == sample->first_chunk ||
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(chunk && chunk->samples_per_chunk == sample->samples_per_chunk
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&& chunk->sample_description_index == sample->sample_description_index))
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continue;
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++entry;
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chunk = sample;
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mov_buffer_w32(&mov->io, sample->first_chunk);
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mov_buffer_w32(&mov->io, sample->samples_per_chunk);
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mov_buffer_w32(&mov->io, sample->sample_description_index);
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}
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size += entry * 12/* entry size*/;
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offset2 = mov_buffer_tell(&mov->io);
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mov_buffer_seek(&mov->io, offset);
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mov_buffer_w32(&mov->io, size); /* size */
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mov_buffer_seek(&mov->io, offset + 12);
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mov_buffer_w32(&mov->io, entry); /* entry count */
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mov_buffer_seek(&mov->io, offset2);
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return size;
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}
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