private.h

MPEG-4编解码的实现(包括MPEG4视音频编解码)

#ifndef PRIVATE_H
#define PRIVATE_H

/* ================================= structures */

#define HEADER_LENGTH 8
#define MAXTRACKS 1024

#include "sizes.h"

typedef struct
{
	float values[9];
} quicktime_matrix_t;


typedef struct
{
	int version;
	long flags;
	unsigned long creation_time;
	unsigned long modification_time;
	int track_id;
	long reserved1;
	long duration;
	char reserved2[8];
	int layer;
	int alternate_group;
	float volume;
	long reserved3;
	quicktime_matrix_t matrix;
	float track_width;
	float track_height;
	int is_video;
	int is_audio;
	int is_hint;
} quicktime_tkhd_t;


typedef struct
{
	long seed;
	long flags;
	long size;
	short int *alpha;
	short int *red;
	short int *green;
	short int *blue;
} quicktime_ctab_t;



/* ===================== sample table ======================== // */



/* sample description */

typedef struct
{
	int motion_jpeg_quantization_table;
} quicktime_mjqt_t;


typedef struct
{
	int motion_jpeg_huffman_table;
} quicktime_mjht_t;

typedef struct
{
	int timeScale;
} quicktime_tims_t;

typedef struct
{
	int version;
	long flags;
	int decoderConfigLen;
	u_char* decoderConfig;
} quicktime_esds_t;

typedef struct
{
	char format[4];
	char reserved[6];
	int data_reference;

/* common to audio and video */
	int version;
	int revision;
	char vendor[4];

/* video description */
	long temporal_quality;
	long spatial_quality;
	int width;
	int height;
	float dpi_horizontal;
	float dpi_vertical;
	long data_size;
	int frames_per_sample;
	char compressor_name[32];
	int depth;
	int ctab_id;
	quicktime_ctab_t ctab;
	float gamma;
	int fields;    /* 0, 1, or 2 */
	int field_dominance;   /* 0 - unknown     1 - top first     2 - bottom first */
	quicktime_mjqt_t mjqt;
	quicktime_mjht_t mjht;

/* audio description */
	int channels;
	int sample_size;
	int compression_id;
	int packet_size;
	float sample_rate;

/* hint description */
	int maxPktSize;
	quicktime_tims_t tims;

/* MP4 elementary stream descriptor */
	quicktime_esds_t esds;

} quicktime_stsd_table_t;


typedef struct
{
	int version;
	long flags;
	long total_entries;
	quicktime_stsd_table_t *table;
} quicktime_stsd_t;


/* time to sample */
typedef struct
{
	long sample_count;
	long sample_duration;
} quicktime_stts_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	long entries_allocated;
	quicktime_stts_table_t *table;
} quicktime_stts_t;


/* sync sample */
typedef struct
{
	long sample;
} quicktime_stss_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	long entries_allocated;
	quicktime_stss_table_t *table;
} quicktime_stss_t;


/* sample to chunk */
typedef struct
{
	long chunk;
	long samples;
	long id;
} quicktime_stsc_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	
	long entries_allocated;
	quicktime_stsc_table_t *table;
} quicktime_stsc_t;


/* sample size */
typedef struct
{
	long size;
} quicktime_stsz_table_t;

typedef struct
{
	int version;
	long flags;
	long sample_size;
	long total_entries;

	long entries_allocated;    /* used by the library for allocating a table */
	quicktime_stsz_table_t *table;
} quicktime_stsz_t;


/* chunk offset */
typedef struct
{
	long offset;
} quicktime_stco_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	
	long entries_allocated;    /* used by the library for allocating a table */
	quicktime_stco_table_t *table;
} quicktime_stco_t;

/* composition time to sample */
typedef struct
{
	long sample_count;
	long sample_offset;
} quicktime_ctts_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	long entries_allocated;
	quicktime_ctts_table_t *table;
} quicktime_ctts_t;


/* sample table */
typedef struct
{
	int version;
	long flags;
	quicktime_stsd_t stsd;
	quicktime_stts_t stts;
	quicktime_stss_t stss;
	quicktime_stsc_t stsc;
	quicktime_stsz_t stsz;
	quicktime_stco_t stco;
	quicktime_ctts_t ctts;
} quicktime_stbl_t;

/* data reference */

typedef struct
{
	long size;
	char type[4];
	int version;
	long flags;
	char *data_reference;
} quicktime_dref_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;
	quicktime_dref_table_t *table;
} quicktime_dref_t;

/* data information */

typedef struct
{
	quicktime_dref_t dref;
} quicktime_dinf_t;

/* video media header */

typedef struct
{
	int version;
	long flags;
	int graphics_mode;
	int opcolor[3];
} quicktime_vmhd_t;


/* sound media header */

typedef struct
{
	int version;
	long flags;
	int balance;
	int reserved;
} quicktime_smhd_t;

/* generic media handler */

typedef struct
{
	int version;
	long flags;
	int graphics_mode;
	int opcolor[3];
	int balance;
	int reserved;
} quicktime_gmin_t;

typedef struct
{
	quicktime_gmin_t gmin;
} quicktime_gmhd_t;

/* hint media handler */
typedef struct
{
	int version;
	long flags;
	int maxPDUsize;
	int avgPDUsize;
	long maxbitrate;
	long avgbitrate;
	long slidingavgbitrate;
} quicktime_hmhd_t;


/* handler reference */

typedef struct
{
	int version;
	long flags;
	char component_type[4];
	char component_subtype[4];
	long component_manufacturer;
	long component_flags;
	long component_flag_mask;
	char component_name[256];
} quicktime_hdlr_t;

/* media information */

typedef struct
{
	int is_video;
	int is_audio;
	int is_hint;
	quicktime_vmhd_t vmhd;
	quicktime_smhd_t smhd;
	quicktime_gmhd_t gmhd;
	quicktime_hmhd_t hmhd;
	quicktime_stbl_t stbl;
	quicktime_hdlr_t hdlr;
	quicktime_dinf_t dinf;
} quicktime_minf_t;


/* media header */

typedef struct
{
	int version;
	long flags;
	unsigned long creation_time;
	unsigned long modification_time;
	long time_scale;
	long duration;
	int language;
	int quality;
} quicktime_mdhd_t;


/* media */

typedef struct
{
	quicktime_mdhd_t mdhd;
	quicktime_minf_t minf;
	quicktime_hdlr_t hdlr;
} quicktime_mdia_t;

/* hint */
typedef struct
{
	int numTracks;
	long trackIds[MAXTRACKS];
	void* traks[MAXTRACKS];
} quicktime_hint_t;

/* tref */
typedef struct
{
	quicktime_hint_t hint;
} quicktime_tref_t;

/* edit list */
typedef struct
{
	long duration;
	long time;
	float rate;
} quicktime_elst_table_t;

typedef struct
{
	int version;
	long flags;
	long total_entries;

	quicktime_elst_table_t *table;
} quicktime_elst_t;

typedef struct
{
	quicktime_elst_t elst;
} quicktime_edts_t;

typedef struct {
	u_int64_t			numBytes;	/* bytes sent including 12 byte RTP hdrs */
} quicktime_trpy_t;

typedef struct {
	u_int64_t			numPackets; /* packets sent */
} quicktime_nump_t;

typedef struct {
	u_int64_t			numBytes;	/* bytes sent of just payload data */
} quicktime_tpyl_t;

typedef struct {
	u_int32_t			granularity;
	u_int32_t			maxBitRate;
} quicktime_maxr_t;

typedef struct {
	u_int64_t			numBytes;	/* bytes sent from media data */
} quicktime_dmed_t;

typedef struct {
	u_int64_t			numBytes;	/* bytes of immediate data */
} quicktime_dimm_t;

typedef struct {
	u_int64_t			numBytes;	/* bytes of repeated data */
} quicktime_drep_t;

typedef struct {
	int32_t				milliSecs;	/* min relative xmit time */
} quicktime_tmin_t;

typedef struct {
	int32_t				milliSecs;	/* max relative xmit time */
} quicktime_tmax_t;

typedef struct {
	u_int32_t			numBytes;	/* largest packet size */
} quicktime_pmax_t;

typedef struct {
	u_int32_t			milliSecs;	/* longest packet duration */
} quicktime_dmax_t;

typedef struct {
	u_int32_t			payloadNumber;	/* RTP payload number */
	char				rtpMapString[256]; /* TBD make this dynamically sized */
} quicktime_payt_t;

typedef struct {
	quicktime_trpy_t	trpy;
	quicktime_nump_t	nump;
	quicktime_tpyl_t	tpyl;
	quicktime_maxr_t	maxr;	/* TBD there can be multiple such atoms */
	quicktime_dmed_t	dmed;
	quicktime_dimm_t	dimm;
	quicktime_drep_t	drep;
	quicktime_tmin_t	tmin;
	quicktime_tmax_t	tmax;
	quicktime_pmax_t	pmax;
	quicktime_dmax_t	dmax;
	quicktime_payt_t	payt;
} quicktime_hinf_t;

typedef struct {
	char*				string;
} quicktime_sdp_t;

typedef struct {
	char*				string;
} quicktime_rtp_t;

typedef struct {
	quicktime_sdp_t		sdp;
} quicktime_hint_hnti_t;

typedef struct {
	quicktime_rtp_t		rtp;
} quicktime_hnti_t;

typedef struct {
	/* TBD name */
	quicktime_hinf_t	hinf;
	quicktime_hint_hnti_t	hnti;
} quicktime_hint_udta_t;

typedef struct
{
	quicktime_tkhd_t tkhd;
	quicktime_mdia_t mdia;
	quicktime_edts_t edts;
	quicktime_tref_t tref;
	quicktime_hint_udta_t hint_udta;
} quicktime_trak_t;

typedef struct
{
	int version;
	long flags;
	int audioProfileId;
	int videoProfileId;
} quicktime_iods_t;

typedef struct
{
	int version;
	long flags;
	unsigned long creation_time;
	unsigned long modification_time;
	long time_scale;
	long duration;
	float preferred_rate;
	float preferred_volume;
	char reserved[10];
	quicktime_matrix_t matrix;
	long preview_time;
	long preview_duration;
	long poster_time;
	long selection_time;
	long selection_duration;
	long current_time;
	long next_track_id;
} quicktime_mvhd_t;

typedef struct
{
	char *copyright;
	int copyright_len;
	char *name;
	int name_len;
	char *info;
	int info_len;
	quicktime_hnti_t hnti;
} quicktime_udta_t;


typedef struct
{
	int total_tracks;

	quicktime_mvhd_t mvhd;
	quicktime_iods_t iods;
	quicktime_trak_t *trak[MAXTRACKS];
	quicktime_udta_t udta;
	quicktime_ctab_t ctab;
} quicktime_moov_t;

typedef struct
{
	long start;
	long size;
} quicktime_mdat_t;


typedef struct
{
	long start;      /* byte start in file */
	long end;        /* byte endpoint in file */
	long size;       /* byte size for writing */
	char type[4];
} quicktime_atom_t;

/* table of pointers to every track */
typedef struct
{
	quicktime_trak_t *track; /* real quicktime track corresponding to this table */
	int channels;            /* number of audio channels in the track */
	long current_position;   /* current sample in output file */
	long current_chunk;      /* current chunk in output file */

	void *codec;

	/* Array of hint tracks for this audio track */
	int totalHintTracks;
	quicktime_trak_t *hintTracks[MAXTRACKS];
	long hintPositions[MAXTRACKS];
} quicktime_audio_map_t;

typedef struct
{
	quicktime_trak_t *track;
	long current_position;
	long current_chunk;

/* Array of pointers to frames of raw data when caching frames. */
	unsigned char **frame_cache;
	long frames_cached;

	void *codec;

	/* Array of hint tracks for this video track */
	int totalHintTracks;
	quicktime_trak_t *hintTracks[MAXTRACKS];
	long hintPositions[MAXTRACKS];
} quicktime_video_map_t;

/* file descriptor passed to all routines */

typedef struct
{
	FILE *stream;
	long total_length;
	quicktime_mdat_t mdat;
	quicktime_moov_t moov;
	int rd;
	int wr;
	int use_avi;
	int use_mp4;

/* mapping of audio channels to movie tracks */
/* one audio map entry exists for each channel */
	int total_atracks;
	quicktime_audio_map_t *atracks;

/* mapping of video tracks to movie tracks */
	int total_vtracks;
	quicktime_video_map_t *vtracks;

	int total_hint_tracks;

/* for begining and ending frame writes where the user wants to write the  */
/* file descriptor directly */
	long offset;

/* Number of processors at our disposal */
	int cpus;

/* I/O */
	long file_position;      /* Current position of file descriptor */

/* Read ahead buffer */
	long preload_size;      /* Enables preload when nonzero. */
	char *preload_buffer;
	long preload_start;     /* Start of preload_buffer in file */
	long preload_end;       /* End of preload buffer in file */
	long preload_ptr;       /* Offset of preload_start in preload_buffer */

/* Parameters for frame currently being decoded */
	int do_scaling;
	int in_x, in_y, in_w, in_h, out_w, out_h;
	int color_model;

/* Cached value for quicktime_video_frame */
	long last_frame;
	long last_start;
	int last_stts_index;

} quicktime_t;

#endif