hvirtual/libmpeg3/mpeg3private.h

Go to the documentation of this file.

#ifndef MPEG3PRIVATE_H
#define MPEG3PRIVATE_H

#include <pthread.h>

#include <stdint.h>

#include <stdio.h>




/* Constants */

#define MPEG3_MAJOR   1
#define MPEG3_MINOR   7
#define MPEG3_RELEASE 0

#define RENDERFARM_FS_PREFIX "vfs://"


#define MPEG3_FLOAT32 float

#define MPEG3_TOC_PREFIX                 0x544f4320
// This decreases with every new version
#define MPEG3_TOC_VERSION                0x000000fa
#define MPEG3_ID3_PREFIX                 0x494433
#define MPEG3_IFO_PREFIX                 0x44564456
#define MPEG3_IO_SIZE                    0x100000     /* Bytes read by mpeg3io at a time */
//#define MPEG3_IO_SIZE                    0x800          /* Bytes read by mpeg3io at a time */
#define MPEG3_RIFF_CODE                  0x52494646
#define MPEG3_PROC_CPUINFO               "/proc/cpuinfo"
#define MPEG3_RAW_SIZE                   0x100000     /* Largest possible packet */
#define MPEG3_BD_PACKET_SIZE             192
#define MPEG3_TS_PACKET_SIZE             188
#define MPEG3_DVD_PACKET_SIZE            0x800
#define MPEG3_SYNC_BYTE                  0x47
#define MPEG3_PACK_START_CODE            0x000001ba
#define MPEG3_SEQUENCE_START_CODE        0x000001b3
#define MPEG3_SEQUENCE_END_CODE          0x000001b7
#define MPEG3_SYSTEM_START_CODE          0x000001bb
#define MPEG3_STRLEN                     1024
#define MPEG3_PIDMAX                     256             /* Maximum number of PIDs in one stream */
#define MPEG3_PROGRAM_ASSOCIATION_TABLE  0x00
#define MPEG3_CONDITIONAL_ACCESS_TABLE   0x01
#define MPEG3_PACKET_START_CODE_PREFIX   0x000001
#define MPEG3_PRIVATE_STREAM_2           0xbf
#define MPEG3_PADDING_STREAM             0xbe
#define MPEG3_GOP_START_CODE             0x000001b8
#define MPEG3_PICTURE_START_CODE         0x00000100
#define MPEG3_EXT_START_CODE             0x000001b5
#define MPEG3_USER_START_CODE            0x000001b2
#define MPEG3_SLICE_MIN_START            0x00000101
#define MPEG3_SLICE_MAX_START            0x000001af
#define MPEG3_AC3_START_CODE             0x0b77
#define MPEG3_PCM_START_CODE             0x7f7f807f
#define MPEG3_MAX_CPUS                   256
#define MPEG3_MAX_STREAMS                0x10000
#define MPEG3_MAX_PACKSIZE               262144
/* Maximum number of complete subtitles to buffer in a subtitle track */
/* or number of incomplete subtitles to buffer in demuxer. */
#define MPEG3_MAX_SUBTITLES              5
/* Positive difference before declaring timecodes discontinuous */
#define MPEG3_CONTIGUOUS_THRESHOLD       10  
/* Minimum number of seconds before interleaving programs */
#define MPEG3_PROGRAM_THRESHOLD          5   
/* Number of frames difference before absolute seeking */
#define MPEG3_SEEK_THRESHOLD             16  
/* Size of chunk of audio in table of contents */
#define MPEG3_AUDIO_CHUNKSIZE            0x10000 
/* Minimum amount of data required to read an audio packet in streaming mode. */
#define MPEG3_AUDIO_STREAM_SIZE          0x1000 
/* Minimum amount of data required to read a video header in streaming mode. */
#define MPEG3_VIDEO_STREAM_SIZE          0x1000 
#define MPEG3_LITTLE_ENDIAN              ((*(uint32_t*)"x\0\0\0") & 0x000000ff)
/* Number of samples in audio history */
#define MPEG3_AUDIO_HISTORY              0x100000 
/* Range to scan for pts after byte seek */
#define MPEG3_PTS_RANGE                  0x100000 

/* Values for audio format */
#define AUDIO_UNKNOWN 0
#define AUDIO_MPEG 1
#define AUDIO_AC3  2
#define AUDIO_PCM  3
#define AUDIO_AAC  4
#define AUDIO_JESUS  5


/* Table of contents sections */
#define FILE_TYPE_PROGRAM 0x00000000
#define FILE_TYPE_TRANSPORT 0x00000001
#define FILE_TYPE_AUDIO 0x00000002
#define FILE_TYPE_VIDEO 0x00000003

#define STREAM_AUDIO 0x00000004
#define STREAM_VIDEO 0x00000005
#define STREAM_SUBTITLE 0x00000006

#define OFFSETS_AUDIO 0x00000007
#define OFFSETS_VIDEO 0x00000008

#define ATRACK_COUNT 0x9
#define VTRACK_COUNT 0xa
#define STRACK_COUNT 0xb

#define TITLE_PATH 0xc
#define IFO_PALETTE 0xd
#define FILE_INFO 0xe

// Combine the pid and the stream id into one unit
#define CUSTOM_ID(pid, stream_id) (((pid << 8) | stream_id) & 0xffff)
#define CUSTOM_ID_PID(id) (id >> 8)
#define CUSTOM_ID_STREAMID(id) (id & 0xff)

#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif


// CSS







struct mpeg3_block 
{
        unsigned char b[5];
};

struct mpeg3_playkey 
{
        int offset;
        unsigned char key[5];
};

typedef struct
{
        int encrypted;
        char device_path[MPEG3_STRLEN];    /* Device the file is located on */
        unsigned char disk_key[MPEG3_DVD_PACKET_SIZE];
        unsigned char title_key[5];
        char challenge[10];
        struct mpeg3_block key1;
        struct mpeg3_block key2;
        struct mpeg3_block keycheck;
        int varient;
        int fd;
        char path[MPEG3_STRLEN];
} mpeg3_css_t;










// I/O











/* Filesystem structure */
/* We buffer in MPEG3_IO_SIZE buffers.  Stream IO would require back */
/* buffering a buffer since the stream must be rewound for packet headers, */
/* sequence start codes, format parsing, decryption, and mpeg3cat. */



typedef struct
{
        FILE *fd;
        mpeg3_css_t *css;          /* Encryption object */
        char path[MPEG3_STRLEN];
        unsigned char *buffer;   /* Readahead buffer */
        int64_t buffer_offset;      /* Current buffer position */
        int64_t buffer_size;        /* Bytes in buffer */
        int64_t buffer_position;    /* Byte in file of start of buffer */

/* Hypothetical position of file pointer */
        int64_t current_byte;
        int64_t total_bytes;
} mpeg3_fs_t;








// Table of contents








// May get rid of time values and rename to a cell offset table.
// May also get rid of end byte.
typedef struct
{
/* Starting byte of cell in the title (start_byte) */
        int64_t title_start;
/* Ending byte of cell in the title (end_byte) */
        int64_t title_end;
/* Starting byte of the cell in the program */
        int64_t program_start;
/* Ending byte of the cell in the program */
        int64_t program_end;
/* Program the cell belongs to */
        int program;
} mpeg3_cell_t;

typedef struct
{
        void *file;
        mpeg3_fs_t *fs;
/* Total bytes in title file.  Critical for seeking and length. */
        int64_t total_bytes;
/* Absolute starting byte of the title in the stream */
        int64_t start_byte;
/* Absolute ending byte of the title in the stream + 1 */
        int64_t end_byte;
/* Timecode table */
        mpeg3_cell_t *cell_table;
        int cell_table_size;    /* Number of entries */
        int cell_table_allocation;    /* Number of available slots */
} mpeg3_title_t;








/* Subtitle object. */
/* Created by the demuxer to store subtitles. */







typedef struct
{
/* Raw data of subtitle */
        unsigned char *data;
/* number of bytes of data */
        int size;
/* Number of stream starting at 0x20 */
        int id;
        int done;
/* Program offset of start of subtitle */
        int64_t offset;

/* image in YUV 4:2:0 */
        unsigned char *image_y;
        unsigned char *image_u;
        unsigned char *image_v;
        unsigned char *image_a;
        int x1;
        int x2;
        int y1;
        int y2;
        int w;
        int h;
/* Force display */
        int force;
/* Time after detection of subtitle to display it in 1/100sec */
        int start_time;
/* Time after detection of subtitle to hide it in 1/100sec */
        int stop_time;
/* Indexes in the main palette */
        int palette[4];
        int alpha[4];
/* The subtitle is being drawn */
        int active;
} mpeg3_subtitle_t;








// Demuxer










typedef struct
{
/* mpeg3_t */
        void* file;
/* One unparsed packet.  MPEG3_RAW_SIZE allocated since we don't know the packet size */
        unsigned char *raw_data;
/* Offset in raw_data of read pointer */
        int raw_offset;
/* Amount loaded in last raw_data */
        int raw_size;


/* Elementary stream data when only one stream is to be read. */
/* Erased in every call to read a packet. */
        unsigned char *data_buffer;
/* Allocation of data_buffer */
        int data_allocated;
/* Position in data_buffer of write pointer */
        int data_size;
/* Position in data_buffer of read pointer */
        int data_position;
/* Start of the next pes packet in the data buffer for reading.  */
/* Used for decoding PCM. */
        int data_start;

/* Elementary stream data when all streams are to be read.  There is no */
/* read pointer since data is expected to be copied directly to a track. */
/* Some packets contain audio and video.  Further division into */
/* stream ID may be needed. */
        unsigned char *audio_buffer;
        int audio_allocated;
        int audio_size;
        int audio_start;
        unsigned char *video_buffer;
        int video_allocated;
        int video_size;
        int video_start;


/* Subtitle objects */
        mpeg3_subtitle_t **subtitles;
        int total_subtitles;





/* What type of data to read. */
        int do_audio;
        int do_video;
        int read_all;

/* Direction of reads */
        int reverse;
/* Set to 1 when eof or attempt to read before beginning */
        int error_flag;
/* Temp variables for returning */
        unsigned char next_char;
/* Info for mpeg3cat */
        int64_t last_packet_start;
        int64_t last_packet_end;
        int64_t last_packet_decryption;

/* Titles */
        mpeg3_title_t *titles[MPEG3_MAX_STREAMS];
        int total_titles;
/* Title currently being used */
        int current_title;
        

/* Tables of every stream ID encountered */
        int astream_table[MPEG3_MAX_STREAMS];  /* macro of audio format if audio  */
        int vstream_table[MPEG3_MAX_STREAMS];  /* 1 if video */

/* Programs */
        int total_programs;
        int current_program;

/* Cell in the current title currently used */
        int title_cell;

/* Byte position in current program. */
        int64_t program_byte;
/* Total bytes in all titles */
        int64_t total_bytes;
/* The end of the current stream in the current program */
        int64_t stream_end;

        int transport_error_indicator;
        int payload_unit_start_indicator;
/* PID of last packet */
        int pid;
/* Stream ID of last packet */
        unsigned int stream_id;
/* Custom ID of last packet */
        unsigned int custom_id;
        int transport_scrambling_control;
        int adaptation_field_control;
        int continuity_counter;
        int is_padding;
        int pid_table[MPEG3_PIDMAX];
        int continuity_counters[MPEG3_PIDMAX];
        int total_pids;
        int adaptation_fields;
        double time;           /* Time in seconds */
        int audio_pid;
        int video_pid;
        int got_audio;
        int got_video;
/* if subtitle object was created in last packet */
        int got_subtitle;
/* When only one stream is to be read, these store the stream IDs */
/* Video stream ID being decoded.  -1 = select first ID in stream */
        int astream;     
/* Audio stream ID being decoded.  -1 = select first ID in stream */
        int vstream;
/* Multiplexed streams have the audio type */
/* Format of the audio derived from multiplexing codes */
        int aformat;      
        int program_association_tables;
        int table_id;
        int section_length;
        int transport_stream_id;
        int pes_packets;
        double pes_audio_time;  /* Presentation Time stamps */
        double pes_video_time;  /* Presentation Time stamps */
/* Cause the stream parameters to be dumped in human readable format */
        int dump;
} mpeg3_demuxer_t;








// Bitstream










//                                    next bit in forward direction
//                                  next bit in reverse direction |
//                                                              v v
// | | | | | | | | | | | | | | | | | | | | | | | | | | |1|1|1|1|1|1| */
//                                                     ^         ^
//                                                     |         bit_number = 1
//                                                     bfr_size = 6

typedef struct
{
        uint32_t bfr;  /* bfr = buffer for bits */
        int bit_number;   /* position of pointer in bfr */
        int bfr_size;    /* number of bits in bfr.  Should always be a multiple of 8 */
        void *file;    /* Mpeg2 file */
        mpeg3_demuxer_t *demuxer;   /* Mpeg2 demuxer */
/* If the input ptr is true, data is read from it instead of the demuxer. */
        unsigned char *input_ptr;
} mpeg3_bits_t;










// Audio







#define AC3_N 512

#define MAXFRAMESIZE 4096
#define MAXFRAMESAMPLES 65536
#define HDRCMPMASK 0xfffffd00
#define SBLIMIT 32
#define SSLIMIT 18
#define SCALE_BLOCK 12
#define MPEG3AUDIO_PADDING 1024

/* Values for mode */
#define MPG_MD_STEREO                   0
#define MPG_MD_JOINT_STEREO     1
#define MPG_MD_DUAL_CHANNEL     2
#define MPG_MD_MONO                     3


#define MAX_AC3_FRAMESIZE 1920 * 2 + 512

extern int mpeg3_ac3_samplerates[3];

/* Exponent strategy constants */
#define MPEG3_EXP_REUSE (0)
#define MPEG3_EXP_D15   (1)
#define MPEG3_EXP_D25   (2)
#define MPEG3_EXP_D45   (3)

/* Delta bit allocation constants */
#define DELTA_BIT_REUSE (0)
#define DELTA_BIT_NEW (1)
#define DELTA_BIT_NONE (2)
#define DELTA_BIT_RESERVED (3)





// Layered decoder

typedef struct
{
        mpeg3_bits_t *stream;


// Layer 3
        unsigned char *bsbuf, *bsbufold;
        unsigned char bsspace[2][MAXFRAMESIZE + 512]; /* MAXFRAMESIZE */
        int bsnum;
        long framesize;           /* For mp3 current framesize without header.  For AC3 current framesize with header. */
        long prev_framesize;
        int channels;
        int samplerate;
        int single;
        int sampling_frequency_code;
        int error_protection;
        int mode;
        int mode_ext;
        int lsf;
        long ssize;
        int mpeg35;
        int padding;
        int layer;
        int extension;
        int copyright;
        int original;
        int emphasis;
        int bitrate;
/* Static variable in synthesizer */
        int bo;                      
/* Ignore first frame after a seek */
        int first_frame;

        float synth_stereo_buffs[2][2][0x110];
        float synth_mono_buff[64];
        float mp3_block[2][2][SBLIMIT * SSLIMIT];
        int mp3_blc[2];



// Layer 2
        int bitrate_index;
    struct al_table *alloc;
    int jsbound;
    int II_sblimit;
        unsigned int layer2_scfsi_buf[64];
} mpeg3_layer_t;





// AC3 decoder

typedef struct
{
        mpeg3_bits_t *stream;
        int samplerate;
        int bitrate;
        int flags;
        int channels;
        void *state;  /* a52_state_t */
        void *output; /* sample_t */
        int framesize;
} mpeg3_ac3_t;




// PCM decoder

#define PCM_HEADERSIZE 20
typedef struct
{
        int samplerate;
        int bits;
        int channels;
        int framesize;
} mpeg3_pcm_t;






/* IMDCT variables */
typedef struct
{
        float real;
        float imag;
} mpeg3_complex_t;

struct al_table 
{
        short bits;
        short d;
};


typedef struct
{
        void* file;
        void* track;

        mpeg3_ac3_t *ac3_decoder;
        mpeg3_layer_t *layer_decoder;
        mpeg3_pcm_t *pcm_decoder;

/* In order of importance */
        long outscale;
/* Number of current frame being decoded */
        int framenum;
        
/* Size of frame including header */
        int framesize;
/* Output from synthesizer in linear floats */
        float **output;           
/* Number of pcm samples in the buffer */
        int output_size;         
/* Allocated number of samples in output */
        int output_allocated;    
/* Sample position in file of start of output buffer */
        int output_position;     

/* Perform a seek to the sample */
        int sample_seek;
/* Perform a seek to the absolute byte */
        int64_t byte_seek;
/* +/- number of samples of difference between audio and video */
        int seek_correction;
/* Buffer containing current packet */
        unsigned char packet_buffer[MAXFRAMESIZE];
/* Position in packet buffer of next byte to read */
        int packet_position;
} mpeg3audio_t;





typedef struct
{
/* Buffer of frames for index.  A frame is a high/low pair. */
        float **index_data;
/* Number of frames allocated in each index channel. */
        int index_allocated;
/* Number of index channels allocated */
        int index_channels;
/* Number of high/low pairs in index channel */
        int index_size;
/* Downsampling of index buffers when constructing index */
        int index_zoom;
} mpeg3_index_t;



typedef struct
{
        int channels;
        int sample_rate;
        mpeg3_demuxer_t *demuxer;
        mpeg3audio_t *audio;
        int current_position;
        int64_t total_samples;
        int format;               /* format of audio */
        unsigned int pid;
/* If we got the header information yet.  Used in streaming mode. */
        int got_header;



/* Pointer to master table of contents when the TOC is read. */
/* Pointer to private table when the TOC is being created */
/* Stores the absolute byte of each audio chunk */
        int64_t *sample_offsets;
        int total_sample_offsets;
        int sample_offsets_allocated;
/* If this sample offset table must be deleted by the track */
        int private_offsets;
/* End of stream in table of contents construction */
        int64_t audio_eof;




/* Starting byte of previous packet for making TOC */
        int64_t prev_offset;

} mpeg3_atrack_t;










// Video










/* zig-zag scan */
extern unsigned char mpeg3_zig_zag_scan_nommx[64];

/* alternate scan */
extern unsigned char mpeg3_alternate_scan_nommx[64];

/* default intra quantization matrix */
extern unsigned char mpeg3_default_intra_quantizer_matrix[64];

/* Frame rate table must agree with the one in the encoder */
extern double mpeg3_frame_rate_table[16];

/* non-linear quantization coefficient table */
extern unsigned char mpeg3_non_linear_mquant_table[32];

#define CHROMA420     1     /* chroma_format */
#define CHROMA422     2
#define CHROMA444     3

#define TOP_FIELD     1     /* picture structure */
#define BOTTOM_FIELD  2
#define FRAME_PICTURE 3

#define SEQ_ID        1     /* extension start code IDs */
#define DISP_ID       2
#define QUANT_ID      3
#define SEQSCAL_ID    5
#define PANSCAN_ID    7
#define CODING_ID     8
#define SPATSCAL_ID   9
#define TEMPSCAL_ID  10

#define SC_NONE       0   /* scalable_mode */
#define SC_DP         1
#define SC_SPAT       2
#define SC_SNR        3
#define SC_TEMP       4

#define I_TYPE        1     /* picture coding type */
#define P_TYPE        2
#define B_TYPE        3
#define D_TYPE        4

#define MB_INTRA      1         /* macroblock type */
#define MB_PATTERN    2
#define MB_BACKWARD   4
#define MB_FORWARD    8
#define MB_QUANT      16
#define MB_WEIGHT     32
#define MB_CLASS4     64

#define MC_FIELD      1     /* motion_type */
#define MC_FRAME      2
#define MC_16X8       2
#define MC_DMV        3

#define MV_FIELD      0     /* mv_format */
#define MV_FRAME      1











/* Array of these feeds the slice decoders */
typedef struct
{
        unsigned char *data;   /* Buffer for holding the slice data */
        int buffer_size;         /* Size of buffer */
        int buffer_allocation;   /* Space allocated for buffer  */
        int current_position;    /* Position in buffer */
        uint32_t bits;
        int bits_size;
        pthread_mutex_t completion_lock; /* Lock slice until completion */
        int done;           /* Signal for slice decoder to skip */
} mpeg3_slice_buffer_t;

/* Each slice decoder */
typedef struct
{
        void *video;     /* mpeg3video_t */
        mpeg3_slice_buffer_t *slice_buffer;

        int thread_number;      /* Number of this thread */
        int current_buffer;     /* Buffer this slice decoder is on */
        int buffer_step;        /* Number of buffers to skip */
        int last_buffer;        /* Last buffer this decoder should process */
        int fault;
        int done;
        int quant_scale;
        int pri_brk;                  /* slice/macroblock */
        short block[12][64];
        int sparse[12];
        pthread_t tid;   /* ID of thread */
        pthread_mutex_t input_lock, output_lock, completion_lock;
} mpeg3_slice_t;

typedef struct 
{
        int hour;
        int minute;
        int second;
        int frame;
} mpeg3_timecode_t;



typedef struct
{
        unsigned char *y, *u, *v;
        int y_size;
        int u_size;
        int v_size;
        int64_t frame_number;
} mpeg3_cacheframe_t;

typedef struct
{
        mpeg3_cacheframe_t *frames;
        int total;
        int allocation;
} mpeg3_cache_t;


typedef struct
{
        void* file;
        void* track;

/* ================================= Seeking variables ========================= */
        mpeg3_bits_t *vstream;
        int decoder_initted;
        unsigned char **output_rows;     /* Output frame buffer supplied by user */
        int in_x, in_y, in_w, in_h, out_w, out_h; /* Output dimensions */
        int row_span;
        int *x_table, *y_table;          /* Location of every output pixel in the input */
        int color_model;
        int want_yvu;                    /* Want to return a YUV frame */
        char *y_output, *u_output, *v_output; /* Output pointers for a YUV frame */

        mpeg3_slice_t slice_decoders[MPEG3_MAX_CPUS];  /* One slice decoder for every CPU */
        int total_slice_decoders;                       /* Total slice decoders in use */
        mpeg3_slice_buffer_t slice_buffers[MPEG3_MAX_CPUS];   /* Buffers for holding the slice data */
        int total_slice_buffers;         /* Total buffers in the array to be decompressed */
        int slice_buffers_initialized;     /* Total buffers initialized in the array */
        pthread_mutex_t slice_lock;      /* Lock slice array while getting the next buffer */
        pthread_mutex_t test_lock;

        int blockreadsize;
        int maxframe;         /* Max value of frame num to read */
        int64_t byte_seek;   /* Perform absolute byte seek before the next frame is read */
        int frame_seek;        /* Perform a frame seek before the next frame is read */
        int framenum;         /* Number of the next frame to be decoded */
        int last_number;       /* Last framenum rendered */
        int found_seqhdr;
        int bitrate;
        mpeg3_timecode_t gop_timecode;     /* Timecode for the last GOP header read. */
        int has_gops; /* Some streams have no GOPs so try sequence start codes instead */

/* These are only available from elementary streams. */
        int frames_per_gop;       /* Frames per GOP after the first GOP. */
        int first_gop_frames;     /* Frames in the first GOP. */
        int first_frame;     /* Number of first frame stored in timecode */
        int last_frame;      /* Last frame in file */

/* ================================= Compression variables ===================== */
/* Malloced frame buffers.  2 refframes are swapped in and out. */
/* while only 1 auxframe is used. */
        unsigned char *yuv_buffer[5];  /* Make YVU buffers contiguous for all frames */
        unsigned char *oldrefframe[3], *refframe[3], *auxframe[3];
        unsigned char *llframe0[3], *llframe1[3];
        unsigned char *mpeg3_zigzag_scan_table;
        unsigned char *mpeg3_alternate_scan_table;
// Source for the next frame presentation
        unsigned char *output_src[3];
/* Pointers to frame buffers. */
        unsigned char *newframe[3];
        int horizontal_size, vertical_size, mb_width, mb_height;
        int coded_picture_width,  coded_picture_height;
        int chroma_format, chrom_width, chrom_height, blk_cnt;
        int pict_type;
        int field_sequence;
        int forw_r_size, back_r_size, full_forw, full_back;
        int prog_seq, prog_frame;
        int h_forw_r_size, v_forw_r_size, h_back_r_size, v_back_r_size;
        int dc_prec, pict_struct, topfirst, frame_pred_dct, conceal_mv;
        int intravlc;
        int repeatfirst;
/* Number of times to repeat the current frame * 100 since floating point is impossible in MMX */
        int repeat_count;
/* Number of times the current frame has been repeated * 100 */
        int current_repeat;
        int secondfield;
        int skip_bframes;
        int stwc_table_index, llw, llh, hm, hn, vm, vn;
        int lltempref, llx0, lly0, llprog_frame, llfieldsel;
        int matrix_coefficients;
        int framerate_code;
        double frame_rate;
        int *cr_to_r, *cr_to_g, *cb_to_g, *cb_to_b;
        int *cr_to_r_ptr, *cr_to_g_ptr, *cb_to_g_ptr, *cb_to_b_ptr;
        int intra_quantizer_matrix[64], non_intra_quantizer_matrix[64];
        int chroma_intra_quantizer_matrix[64], chroma_non_intra_quantizer_matrix[64];
        int mpeg2;
        int qscale_type, altscan;      /* picture coding extension */
        int pict_scal;                /* picture spatial scalable extension */
        int scalable_mode;            /* sequence scalable extension */

/* Subtitling frame */
        unsigned char *subtitle_frame[3];
} mpeg3video_t;















typedef struct
{
        int width;
        int height;
        double frame_rate;
        float aspect_ratio;
        mpeg3_demuxer_t *demuxer;
/* Video decoding object */
        mpeg3video_t *video;
/* Table of current subtitles being overlayed */
        mpeg3_subtitle_t **subtitles;
        int total_subtitles;
        int current_position;  /* Number of next frame to be played */
        int total_frames;     /* Total frames in the file */
        unsigned int pid;


/* Pointer to master table of contents when the TOC is read. */
/* Pointer to private table when the TOC is being created */
/* Stores the absolute byte of each frame */
        int64_t *frame_offsets;
        int total_frame_of