43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#include "mpeg-types.h"
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#include "mpeg-util.h"
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#include <assert.h>
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#include <string.h>
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#define H265_NAL_AUD 35
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/// @return -1-not found, other-AUD position(include start code)
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int find_h265_access_unit_delimiter(const uint8_t *p, size_t bytes)
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{
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size_t i;
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for (i = 2; i + 1 < bytes; i++) {
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if (0x01 == p[i] && 0x00 == p[i - 1] && 0x00 == p[i - 2] && H265_NAL_AUD == ((p[i + 1] >> 1) & 0x3f)) {
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for (i -= 2; i > 0 && 0 == p[i - 1]; --i) {
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// filter trailing zero
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}
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return (int)i;
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}
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}
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return -1;
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}
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// Rec. ITU-T H.265 v4 (12/2016) (p26)
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// intra random access point (IRAP) picture:
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// A coded picture for which each VCL NAL unit has nal_unit_type
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// in the range of BLA_W_LP to RSV_IRAP_VCL23, inclusive.
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int find_h265_keyframe(const uint8_t *p, size_t bytes)
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{
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size_t i;
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uint8_t type;
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for (i = 2; i + 1 < bytes; i++) {
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if (0x01 == p[i] && 0x00 == p[i - 1] && 0x00 == p[i - 2]) {
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type = (p[i + 1] >> 1) & 0x3f;
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if (type < 32) {
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return (16 <= type && type <= 23) ? 1 : 0;
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}
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}
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}
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return 0;
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}
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