h265码流slice header解析的c代码

以下是一个简单的 H.265 码流 Slice Header 解析的 C 代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define MAX_SLICES_PER_PICTURE 100

typedef struct {
    int first_slice_segment_in_pic_flag;
    int no_output_of_prior_pics_flag;
    int slice_pic_parameter_set_id;
    int slice_type;
    int pic_output_flag;
    int colour_plane_id;
    int slice_pic_order_cnt_lsb;
    int short_term_ref_pic_set_sps_flag;
    int short_term_ref_pic_set_idx;
    int num_long_term_sps;
    int num_long_term_pics;
    int delta_poc_msb_present_flag[MAX_NUM_LONG_TERM_PICS];
    int long_term_pic_num[MAX_NUM_LONG_TERM_PICS];
    int lt_idx_sps[MAX_NUM_LONG_TERM_PICS];
    int poc_lsb_lt[MAX_NUM_LONG_TERM_PICS];
    int used_by_curr_pic_lt_flag[MAX_NUM_LONG_TERM_PICS];
    int delta_poc_msb_cycle_lt[MAX_NUM_LONG_TERM_PICS];
    int slice_temporal_mvp_enabled_flag;
    int slice_sao_luma_flag;
    int slice_sao_chroma_flag;
    int num_ref_idx_active_override_flag;
    int num_ref_idx_l0_active_minus1;
    int num_ref_idx_l1_active_minus1;
    int mvd_l1_zero_flag;
    int cabac_init_flag;
    int collocated_from_l0_flag;
    int collocated_ref_idx;
    int five_minus_max_num_merge_cand;
    int slice_qp_delta;
    int cu_chroma_qp_offset_enabled_flag;
    int slice_cb_qp_offset;
    int slice_cr_qp_offset;
    int deblocking_filter_override_flag;
    int slice_deblocking_filter_disabled_flag;
    int beta_offset_div2;
    int tc_offset_div2;
} slice_header_t;

int parse_slice_header(uint8_t *buf, int buf_size, slice_header_t *slice_header)
{
    int i = 0;

    // Parse first byte
    slice_header->first_slice_segment_in_pic_flag = (buf[i] >> 7) & 0x01;
    slice_header->no_output_of_prior_pics_flag = (buf[i] >> 6) & 0x01;
    slice_header->slice_pic_parameter_set_id = buf[i++] & 0x3f;

    // Parse second byte
    slice_header->slice_type = (buf[i] >> 1) & 0x07;
    slice_header->pic_output_flag = buf[i++] & 0x01;

    // Parse third byte
    slice_header->colour_plane_id = (buf[i] >> 6) & 0x03;
    slice_header->slice_pic_order_cnt_lsb = ((buf[i] & 0x3f) << 8) | buf[i+1];
    i += 2;

    // Parse optional fields
    if (/* Check for optional fields */) {
        // Parse optional fields
    }

    return i;
}

int main()
{
    uint8_t buf[1024];
    int buf_size = 1024;
    slice_header_t slice_headers[MAX_SLICES_PER_PICTURE];
    int num_slices = 0;

    // Parse slice headers
    int offset = 0;
    while (offset < buf_size && num_slices < MAX_SLICES_PER_PICTURE) {
        offset += parse_slice_header(buf+offset, buf_size-offset, &slice_headers[num_slices]);
        num_slices++;
    }

    return 0;
}

请注意，此示例代码仅为演示目的，实际应用中可能需要根据具体情况进行调整。