
#ifndef __MP4AV_H264_H__
#define __MP4AV_H264_H__ 1

#define H264_START_CODE 0x000001
#define H264_PREVENT_3_BYTE 0x000003

#define H264_PROFILE_BASELINE 66
#define H264_PROFILE_MAIN 77
#define H264_PROFILE_EXTENDED 88

#define H264_NAL_TYPE_NON_IDR_SLICE 1
#define H264_NAL_TYPE_DP_A_SLICE 2
#define H264_NAL_TYPE_DP_B_SLICE 3
#define H264_NAL_TYPE_DP_C_SLICE 0x4
#define H264_NAL_TYPE_IDR_SLICE 0x5
#define H264_NAL_TYPE_SEI 0x6
#define H264_NAL_TYPE_SEQ_PARAM 0x7
#define H264_NAL_TYPE_PIC_PARAM 0x8
#define H264_NAL_TYPE_ACCESS_UNIT 0x9
#define H264_NAL_TYPE_END_OF_SEQ 0xa
#define H264_NAL_TYPE_END_OF_STREAM 0xb
#define H264_NAL_TYPE_FILLER_DATA 0xc
#define H264_NAL_TYPE_SEQ_EXTENSION 0xd

#define H264_TYPE_P 0
#define H264_TYPE_B 1
#define H264_TYPE_I 2
#define H264_TYPE_SP 3
#define H264_TYPE_SI 4
#define H264_TYPE2_P 5
#define H264_TYPE2_B 6
#define H264_TYPE2_I 7
#define H264_TYPE2_SP 8
#define H264_TYPE2_SI 9

#define H264_TYPE_IS_P(t) ((t) == H264_TYPE_P || (t) == H264_TYPE2_P)
#define H264_TYPE_IS_B(t) ((t) == H264_TYPE_B || (t) == H264_TYPE2_B)
#define H264_TYPE_IS_I(t) ((t) == H264_TYPE_I || (t) == H264_TYPE2_I)
#define H264_TYPE_IS_SP(t) ((t) == H264_TYPE_SP || (t) == H264_TYPE2_SP)
#define H264_TYPE_IS_SI(t) ((t) == H264_TYPE_SI || (t) == H264_TYPE2_SI)
typedef struct h264_decode_t {
  uint8_t profile;
  uint8_t level;
  uint32_t chroma_format_idc;
  uint8_t residual_colour_transform_flag;
  uint32_t bit_depth_luma_minus8;
  uint32_t bit_depth_chroma_minus8;
  uint8_t qpprime_y_zero_transform_bypass_flag;
  uint8_t seq_scaling_matrix_present_flag;
  uint32_t log2_max_frame_num_minus4;
  uint32_t log2_max_pic_order_cnt_lsb_minus4;
  uint32_t pic_order_cnt_type;
  uint8_t frame_mbs_only_flag;
  uint8_t pic_order_present_flag;
  uint8_t delta_pic_order_always_zero_flag;
  int32_t offset_for_non_ref_pic;
  int32_t offset_for_top_to_bottom_field;
  uint32_t pic_order_cnt_cycle_length;
  int16_t offset_for_ref_frame[256];

  uint8_t nal_ref_idc;
  uint8_t nal_unit_type;
  
  uint8_t field_pic_flag;
  uint8_t bottom_field_flag;
  uint32_t frame_num;
  uint32_t idr_pic_id;
  uint32_t pic_order_cnt_lsb;
  int32_t delta_pic_order_cnt_bottom;
  int32_t delta_pic_order_cnt[2];

  uint32_t pic_width, pic_height;
  uint32_t slice_type;

  /* POC state */
  int32_t  pic_order_cnt;        /* can be < 0 */

  uint32_t  pic_order_cnt_msb;
  uint32_t  pic_order_cnt_msb_prev;
  uint32_t  pic_order_cnt_lsb_prev;
  uint32_t  frame_num_prev;
  int32_t  frame_num_offset;
  int32_t  frame_num_offset_prev;

  uint8_t NalHrdBpPresentFlag;
  uint8_t VclHrdBpPresentFlag;
  uint8_t CpbDpbDelaysPresentFlag;
  uint8_t pic_struct_present_flag;
  uint8_t cpb_removal_delay_length_minus1;
  uint8_t time_offset_length;
  uint32_t cpb_cnt_minus1;
  uint8_t initial_cpb_removal_delay_length_minus1;
} h264_decode_t;

#ifdef __cplusplus
extern "C" {
#endif

  bool h264_is_start_code(const uint8_t *pBuf);

uint32_t h264_find_next_start_code(const uint8_t *pBuf, 
				   uint32_t bufLen);

  uint8_t h264_nal_unit_type(const uint8_t *buffer);

  int h264_nal_unit_type_is_slice(const uint8_t nal_type);
  int h264_find_slice_type(const uint8_t *buffer, 
			   uint32_t buflen, 
			   uint8_t *slice_type, 
			   bool noheader);
  uint8_t h264_nal_ref_idc(const uint8_t *buffer);
  int h264_detect_boundary(const uint8_t *buffer, 
			   uint32_t buflen, 
			   h264_decode_t *decode);

  int h264_read_slice_info(const uint8_t *buffer, 
			   uint32_t buflen, 
			   h264_decode_t *dec);
  int h264_read_seq_info(const uint8_t *buffer, 
			 uint32_t buflen, 
			 h264_decode_t *dec);
  uint32_t h264_read_sei_value (const uint8_t *buffer, uint32_t *size);

  bool h264_slice_is_idr(h264_decode_t *dec);

  const char *h264_get_slice_name(const uint8_t slice_type);

  bool h264_access_unit_is_sync(const uint8_t *pNal, uint32_t len);

  // note - must free string
  char *h264_get_profile_level_string(const uint8_t profile, 
				      const uint8_t level);
#ifdef __cplusplus
 }
#endif

#endif
