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【C】从PS流中提取音频和视频

作者:周年荻 / 发布于2013/8/20/ 683


	#ifndef _STREAMDEF_H_
	#define _STREAMDEF_H_
	#define MAX_PS_LENGTH (0xFFFF)
	#define MAX_PES_LENGTH (0xFFFF)
	#define MAX_ES_LENGTH (0x100000)
	typedef unsigned short uint16_t;
	typedef unsigned int uint32_t;
	#pragma pack (1)
	typedef struct RTP_HEADER
	{
	#ifdef ORTP_BIGENDIAN
	 uint16_t version:2;
	 uint16_t padbit:1;
	 uint16_t extbit:1;
	 uint16_t cc:4;
	 uint16_t markbit:1;
	 uint16_t paytype:7;
	#else
	 uint16_t cc:4;
	 uint16_t extbit:1;
	 uint16_t padbit:1;
	 uint16_t version:2;
	 uint16_t paytype:7; //负载类型
	 uint16_t markbit:1; //1表示前面的包为一个解码单元,0表示当前解码单元未结束
	#endif
	 uint16_t seq_number; //序号
	 uint32_t timestamp; //时间戳
	 uint32_t ssrc; //循环校验码
	 //uint32_t csrc[16];
	} RTP_header_t;

	typedef struct ps_header{
	 unsigned char pack_start_code[4]; //'0x000001BA'

	 unsigned char system_clock_reference_base21:2;
	 unsigned char marker_bit:1;
	 unsigned char system_clock_reference_base1:3;
	 unsigned char fix_bit:2; //'01'

	 unsigned char system_clock_reference_base22;

	 unsigned char system_clock_reference_base31:2;
	 unsigned char marker_bit1:1;
	 unsigned char system_clock_reference_base23:5;

	 unsigned char system_clock_reference_base32;
	 unsigned char system_clock_reference_extension1:2;
	 unsigned char marker_bit2:1;
	 unsigned char system_clock_reference_base33:5; //system_clock_reference_base 33bit

	 unsigned char marker_bit3:1;
	 unsigned char system_clock_reference_extension2:7; //system_clock_reference_extension 9bit

	 unsigned char program_mux_rate1;

	 unsigned char program_mux_rate2;
	 unsigned char marker_bit5:1;
	 unsigned char marker_bit4:1;
	 unsigned char program_mux_rate3:6;

	 unsigned char pack_stuffing_length:3;
	 unsigned char reserved:5;
	}ps_header_t; //14

	typedef struct sh_header
	{
	 unsigned char system_header_start_code[4]; //32

	 unsigned char header_length[2]; //16 uimsbf

	 uint32_t marker_bit1:1; //1 bslbf
	 uint32_t rate_bound:22; //22 uimsbf
	 uint32_t marker_bit2:1; //1 bslbf
	 uint32_t audio_bound:6; //6 uimsbf
	 uint32_t fixed_flag:1; //1 bslbf
	 uint32_t CSPS_flag:1; //1 bslbf

	 uint16_t system_audio_lock_flag:1; // bslbf
	 uint16_t system_video_lock_flag:1; // bslbf
	 uint16_t marker_bit3:1; // bslbf
	 uint16_t video_bound:5; // uimsbf
	 uint16_t packet_rate_restriction_flag:1; //bslbf
	 uint16_t reserved_bits:7; //bslbf
	 unsigned char reserved[6];
	}sh_header_t; //18

	typedef struct psm_header{
	 unsigned char promgram_stream_map_start_code[4];

	 unsigned char program_stream_map_length[2];

	 unsigned char program_stream_map_version:5;
	 unsigned char reserved1:2;
	 unsigned char current_next_indicator:1;

	 unsigned char marker_bit:1;
	 unsigned char reserved2:7;

	 unsigned char program_stream_info_length[2];
	 unsigned char elementary_stream_map_length[2];
	 unsigned char stream_type;
	 unsigned char elementary_stream_id;
	 unsigned char elementary_stream_info_length[2];
	 unsigned char CRC_32[4];
	 unsigned char reserved[16];
	}psm_header_t; //36

	typedef struct pes_header
	{
	 unsigned char pes_start_code_prefix[3];
	 unsigned char stream_id;
	 unsigned short PES_packet_length;
	}pes_header_t; //6

	typedef struct optional_pes_header{
	 unsigned char original_or_copy:1;
	 unsigned char copyright:1;
	 unsigned char data_alignment_indicator:1;
	 unsigned char PES_priority:1;
	 unsigned char PES_scrambling_control:2;
	 unsigned char fix_bit:2;

	 unsigned char PES_extension_flag:1;
	 unsigned char PES_CRC_flag:1;
	 unsigned char additional_copy_info_flag:1;
	 unsigned char DSM_trick_mode_flag:1;
	 unsigned char ES_rate_flag:1;
	 unsigned char ESCR_flag:1;
	 unsigned char PTS_DTS_flags:2;

	 unsigned char PES_header_data_length;
	}optional_pes_header_t;

	#pragma pack ()


	enum PSStatus
	{
	 ps_padding, //未知状态
	 ps_ps, //ps状态
	 ps_sh,
	 ps_psm,
	 ps_pes,
	 ps_pes_video,
	 ps_pes_audio
	};

	#endif

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