#ifndef _mpeg4_avc_h_
#define _mpeg4_avc_h_

#include <stdint.h>
#include <stddef.h>

#if defined(__cplusplus)
extern "C" {
#endif

struct mpeg4_avc_t
{
//	uint8_t version; // 1-only
	uint8_t profile;
	uint8_t compatibility; // constraint_set[0-5]_flag
	uint8_t level;
	uint8_t nalu; // NALUnitLength = (lengthSizeMinusOne + 1), default 4(0x03+1)

	uint8_t nb_sps;
	uint8_t nb_pps;

	struct mpeg4_avc_sps_t
	{
		uint16_t bytes;
		uint8_t* data;
	}  sps[32]; // [0-31]

	struct mpeg4_avc_pps_t
	{
		uint16_t bytes;
		uint8_t* data;
	} pps[256];

	// extension
	uint8_t chroma_format_idc;
	uint8_t bit_depth_luma_minus8;
	uint8_t bit_depth_chroma_minus8;

    uint8_t data[4 * 1024];
	size_t off;
};

// load avc from AVCDecoderConfigurationRecord
/// @return <=0-error, >0-output bytes
int mpeg4_avc_decoder_configuration_record_load(const uint8_t* data, size_t bytes, struct mpeg4_avc_t* avc);

/// @return <=0-error, >0-output bytes
int mpeg4_avc_decoder_configuration_record_save(const struct mpeg4_avc_t* avc, uint8_t* data, size_t bytes);

// load avc from annex-b bitstream
int mpeg4_avc_from_nalu(const uint8_t* data, size_t bytes, struct mpeg4_avc_t* avc);

int mpeg4_avc_to_nalu(const struct mpeg4_avc_t* avc, uint8_t* data, size_t bytes);

int mpeg4_avc_codecs(const struct mpeg4_avc_t* avc, char* codecs, size_t bytes);

/// @param[out] vcl 0-non VCL, 1-IDR, 2-P/B
/// @return <=0-error, >0-output bytes
int h264_annexbtomp4(struct mpeg4_avc_t* avc, const void* data, size_t bytes, void* out, size_t size, int* vcl, int* update);

/// @return <=0-error, >0-output bytes
int h264_mp4toannexb(const struct mpeg4_avc_t* avc, const void* data, size_t bytes, void* out, size_t size);

/// h264_is_new_access_unit H.264 new access unit(frame)
/// @return 1-new access, 0-not a new access
int h264_is_new_access_unit(const uint8_t* nalu, size_t bytes);

/// H.264 nal unit split
int mpeg4_h264_annexb_nalu(const void* h264, size_t bytes, void (*handler)(void* param, const uint8_t* nalu, size_t bytes), void* param);

/// Detect H.264 bitstrem type: H.264 Annexb or MP4-AVCC
/// @return 0-annexb, >0-avcc length, <0-error
int mpeg4_h264_bitstream_format(const uint8_t* h264, size_t bytes);

#if defined(__cplusplus)
}
#endif
#endif /* !_mpeg4_avc_h_ */