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avformat/evc: move NALU length and type parsing functions to a header

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer
2023-06-20 10:31:24 -03:00
parent e5da2ec456
commit c7183a22db
3 changed files with 36 additions and 43 deletions
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30
libavformat/evc.h
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@@ -24,9 +24,39 @@
#include <stdint.h>
#include "libavutil/rational.h"
#include "libavcodec/evc.h"
#include "avio.h"
static inline int evc_get_nalu_type(const uint8_t *bits, int bits_size)
{
int unit_type_plus1 = 0;
if (bits_size >= EVC_NALU_HEADER_SIZE) {
unsigned char *p = (unsigned char *)bits;
// forbidden_zero_bit
if ((p[0] & 0x80) != 0) // Cannot get bitstream information. Malformed bitstream.
return -1;
// nal_unit_type
unit_type_plus1 = (p[0] >> 1) & 0x3F;
}
return unit_type_plus1 - 1;
}
static inline uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size)
{
uint32_t nalu_len = 0;
if (bits_size >= EVC_NALU_LENGTH_PREFIX_SIZE) {
unsigned char *p = (unsigned char *)bits;
for (int i = 0; i < EVC_NALU_LENGTH_PREFIX_SIZE; i++)
nalu_len = (nalu_len << 8) | p[i];
}
return nalu_len;
}
/**
* Writes EVC sample metadata to the provided AVIOContext.