99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
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#include "mpeg-types.h"
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#include "mpeg-util.h"
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#include "mpeg-proto.h"
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#include <assert.h>
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#include <string.h>
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#define H266_NAL_IDR_W_RADL 7
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#define H266_NAL_RSV_IRAP 11
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#define H266_NAL_OPI 12
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#define H266_NAL_DCI 13
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#define H266_NAL_VPS 14
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#define H266_NAL_SPS 15
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#define H266_NAL_PPS 16
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#define H266_PREFIX_APS_NUT 17
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#define H266_SUFFIX_APS_NUT 18
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#define H266_PH_NUT 19
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#define H266_NAL_AUD 20
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#define H266_NAL_PREFIX_SEI 23
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#define H266_NAL_SUFFIX_SEI 24
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/// @return 0-not find, 1-find ok
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int mpeg_h266_start_with_access_unit_delimiter(const uint8_t* p, size_t bytes)
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{
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int i;
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uint8_t nalu;
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i = mpeg_h264_find_nalu(p, bytes, NULL);
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if (-1 == i)
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return 0;
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assert(i > 0);
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nalu = (p[i + 1] >> 3) & 0x1f;
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return H266_NAL_AUD == nalu ? 1 : 0;
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}
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static int mpeg_h266_is_new_access_unit(const uint8_t* nalu, size_t bytes)
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{
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uint8_t nal_type;
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uint8_t nuh_layer_id;
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if (bytes < 3)
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return 0;
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nal_type = (nalu[1] >> 3) & 0x1f;
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nuh_layer_id = nalu[0] & 0x3F;
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// 7.4.2.4.3 Order of PUs and their association to AUs
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if (H266_NAL_AUD == nal_type || H266_NAL_OPI == nal_type || H266_NAL_DCI == nal_type || H266_NAL_VPS == nal_type || H266_NAL_SPS == nal_type || H266_NAL_PPS == nal_type ||
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(nuh_layer_id == 0 && (H266_PREFIX_APS_NUT == nal_type || H266_PH_NUT == nal_type || H266_NAL_PREFIX_SEI == nal_type ||
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26 == nal_type || (28 <= nal_type && nal_type <= 29))))
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return 1;
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// 7.4.2.4.4 Order of NAL units and coded pictures and their association to PUs
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if (nal_type < H266_NAL_OPI)
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{
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//sh_picture_header_in_slice_header_flag == 1
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return (nalu[2] & 0x80) ? 1 : 0;
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}
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return 0;
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}
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int mpeg_h266_find_new_access_unit(const uint8_t* data, size_t bytes, int* vcl)
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{
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int n;
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size_t leading;
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uint8_t nal_type;
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const uint8_t* p, * end;
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end = data + bytes;
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for (p = data; p && p < end; p += n)
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{
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n = mpeg_h264_find_nalu(p, end - p, &leading);
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if (n < 1)
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return -1;
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nal_type = (p[n+1] >> 3) & 0x1f;
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if (*vcl > 0 && mpeg_h266_is_new_access_unit(p + n, end - p - n))
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{
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return (int)(p - data + n - leading);
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}
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else if (nal_type < H266_NAL_OPI)
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{
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*vcl = (H266_NAL_IDR_W_RADL <= nal_type && nal_type <= H266_NAL_RSV_IRAP) ? MPEG_VCL_IDR : MPEG_VCL_P;
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}
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else if (PES_SID_START == p[n])
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{
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// pes data loss ???
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*vcl = MPEG_VCL_CORRUPT; // for assert
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return (int)(p - data + n - leading);
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}
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else
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{
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// nothing to do
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}
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}
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return -1;
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}
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