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175 lines
6.5 KiB
175 lines
6.5 KiB
/*****************************************************************************
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* vpar_headers.h : video parser : headers parsing
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* (c)1999 VideoLAN
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*****************************************************************************
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*****************************************************************************
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* Requires:
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* "config.h"
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* "common.h"
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* "mtime.h"
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* "vlc_thread.h"
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* "input.h"
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* "video.h"
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* "video_output.h"
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* "decoder_fifo.h"
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* "video_fifo.h"
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*****************************************************************************/
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/*****************************************************************************
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* Function pointers
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*****************************************************************************/
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struct vpar_thread_s;
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typedef void (*f_slice_header_t)( struct vpar_thread_s*, int*, int, u32);
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typedef void (*f_chroma_pattern_t)( struct vpar_thread_s* );
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typedef int (*f_macroblock_type_t)( struct vpar_thread_s* );
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/*****************************************************************************
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* quant_matrix_t : Quantization Matrix
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*****************************************************************************/
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typedef struct quant_matrix_s
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{
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int * pi_matrix;
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boolean_t b_allocated;
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/* Has the matrix been allocated by vpar_headers ? */
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} quant_matrix_t;
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/*****************************************************************************
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* sequence_t : sequence descriptor
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*****************************************************************************/
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typedef struct sequence_s
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{
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u32 i_height, i_width, i_size;
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u32 i_mb_height, i_mb_width, i_mb_size;
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unsigned int i_aspect_ratio;
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double d_frame_rate;
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boolean_t b_mpeg2;
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boolean_t b_progressive;
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unsigned int i_scalable_mode;
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f_slice_header_t pf_slice_header;
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quant_matrix_t intra_quant, nonintra_quant;
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quant_matrix_t chroma_intra_quant, chroma_nonintra_quant;
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void (*pf_decode_mv)( struct vpar_thread_s *, int );
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f_chroma_pattern_t pf_decode_pattern;
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/* Chromatic information */
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unsigned int i_chroma_format;
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int i_chroma_nb_blocks;
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u32 i_chroma_width;
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u32 i_chroma_mb_width, i_chroma_mb_height;
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/* Parser context */
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picture_t * p_forward;
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picture_t * p_backward;
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/* Copyright extension */
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boolean_t b_copyright_flag; /* Whether the following
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information is significant
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or not. */
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u8 i_copyright_id;
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boolean_t b_original;
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u64 i_copyright_nb;
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} sequence_t;
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/*****************************************************************************
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* picture_parsing_t : parser context descriptor
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*****************************************************************************/
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typedef struct picture_parsing_s
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{
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boolean_t b_full_pel_forward_vector, b_full_pel_backward_vector;
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int i_forward_f_code, i_backward_f_code;
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int ppi_f_code[2][2];
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int i_intra_dc_precision;
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boolean_t b_frame_pred_frame_dct, b_q_scale_type;
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boolean_t b_intra_vlc_format;
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boolean_t b_alternate_scan, b_progressive_frame;
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boolean_t b_top_field_first, b_concealment_mv;
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boolean_t b_repeat_first_field;
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int i_l_stride, i_c_stride;
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/* Used for second field management */
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int i_current_structure;
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picture_t * p_picture;
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macroblock_t * pp_mb[MAX_MB];
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/* Relative to the current field */
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int i_coding_type, i_structure;
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boolean_t b_frame_structure;
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f_macroblock_type_t pf_macroblock_type;
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boolean_t b_error;
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} picture_parsing_t;
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/*****************************************************************************
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* slice_parsing_t : parser context descriptor #2
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*****************************************************************************/
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typedef struct slice_parsing_s
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{
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unsigned char i_quantizer_scale;
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int pi_dc_dct_pred[3]; /* ISO/IEC 13818-2 7.2.1 */
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int pppi_pmv[2][2][2]; /* Motion vect predictors, 7.6.3 */
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} slice_parsing_t;
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/*****************************************************************************
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* mb_addr_inc_t : entry type for MacroblockAddressIncrement lookup table *
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*****************************************************************************/
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typedef struct mb_addr_inc_s
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{
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int i_value;
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int i_length;
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} mb_addr_inc_t;
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/*****************************************************************************
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* Standard codes
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*****************************************************************************/
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#define PICTURE_START_CODE 0x100
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#define SLICE_START_CODE_MIN 0x101
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#define SLICE_START_CODE_MAX 0x1AF
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#define USER_DATA_START_CODE 0x1B2
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#define SEQUENCE_HEADER_CODE 0x1B3
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#define SEQUENCE_ERROR_CODE 0x1B4
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#define EXTENSION_START_CODE 0x1B5
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#define SEQUENCE_END_CODE 0x1B7
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#define GROUP_START_CODE 0x1B8
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/* extension start code IDs */
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#define SEQUENCE_EXTENSION_ID 1
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#define SEQUENCE_DISPLAY_EXTENSION_ID 2
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#define QUANT_MATRIX_EXTENSION_ID 3
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#define COPYRIGHT_EXTENSION_ID 4
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#define SEQUENCE_SCALABLE_EXTENSION_ID 5
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#define PICTURE_DISPLAY_EXTENSION_ID 7
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#define PICTURE_CODING_EXTENSION_ID 8
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#define PICTURE_SPATIAL_SCALABLE_EXTENSION_ID 9
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#define PICTURE_TEMPORAL_SCALABLE_EXTENSION_ID 10
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/* scalable modes */
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#define SC_NONE 0
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#define SC_DP 1
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#define SC_SPAT 2
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#define SC_SNR 3
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#define SC_TEMP 4
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/* Pictures types */
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#define I_CODING_TYPE 1
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#define P_CODING_TYPE 2
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#define B_CODING_TYPE 3
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#define D_CODING_TYPE 4 /* MPEG-1 ONLY */
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/* other values are reserved */
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/* Structures */
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#define TOP_FIELD 1
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#define BOTTOM_FIELD 2
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#define FRAME_STRUCTURE 3
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/*****************************************************************************
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* Prototypes
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*****************************************************************************/
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int vpar_NextSequenceHeader( struct vpar_thread_s * p_vpar );
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int vpar_ParseHeader( struct vpar_thread_s * p_vpar );
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