libmpeg2.h
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- /*
- * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- *
- * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
- * See http://libmpeg2.sourceforge.net/ for updates.
- *
- * mpeg2dec is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * mpeg2dec is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #pragma once
- typedef signed char int8_t;
- typedef signed short int16_t;
- typedef signed int int32_t;
- typedef unsigned char uint8_t;
- typedef unsigned short uint16_t;
- typedef unsigned int uint32_t;
- #define MPEG2_VERSION(a,b,c) (((a)<<16)|((b)<<8)|(c))
- #define MPEG2_RELEASE MPEG2_VERSION (0, 3, 2) /* 0.3.2 */
- #define SEQ_FLAG_MPEG2 1
- #define SEQ_FLAG_CONSTRAINED_PARAMETERS 2
- #define SEQ_FLAG_PROGRESSIVE_SEQUENCE 4
- #define SEQ_FLAG_LOW_DELAY 8
- #define SEQ_FLAG_COLOUR_DESCRIPTION 16
- #define SEQ_MASK_VIDEO_FORMAT 0xe0
- #define SEQ_VIDEO_FORMAT_COMPONENT 0
- #define SEQ_VIDEO_FORMAT_PAL 0x20
- #define SEQ_VIDEO_FORMAT_NTSC 0x40
- #define SEQ_VIDEO_FORMAT_SECAM 0x60
- #define SEQ_VIDEO_FORMAT_MAC 0x80
- #define SEQ_VIDEO_FORMAT_UNSPECIFIED 0xa0
- typedef struct {
- unsigned int width, height;
- unsigned int chroma_width, chroma_height;
- unsigned int byte_rate;
- unsigned int vbv_buffer_size;
- uint32_t flags;
- unsigned int picture_width, picture_height;
- unsigned int display_width, display_height;
- unsigned int pixel_width, pixel_height;
- unsigned int frame_period;
- uint8_t profile_level_id;
- uint8_t colour_primaries;
- uint8_t transfer_characteristics;
- uint8_t matrix_coefficients;
- void finalize();
- } mpeg2_sequence_t;
- #define GOP_FLAG_DROP_FRAME 1
- #define GOP_FLAG_BROKEN_LINK 2
- #define GOP_FLAG_CLOSED_GOP 4
- typedef struct {
- uint8_t hours;
- uint8_t minutes;
- uint8_t seconds;
- uint8_t pictures;
- uint32_t flags;
- } mpeg2_gop_t;
- #define PIC_MASK_CODING_TYPE 7
- #define PIC_FLAG_CODING_TYPE_I 1
- #define PIC_FLAG_CODING_TYPE_P 2
- #define PIC_FLAG_CODING_TYPE_B 3
- #define PIC_FLAG_CODING_TYPE_D 4
- #define PIC_FLAG_TOP_FIELD_FIRST 8
- #define PIC_FLAG_PROGRESSIVE_FRAME 16
- #define PIC_FLAG_COMPOSITE_DISPLAY 32
- #define PIC_FLAG_SKIP 64
- #define PIC_FLAG_PTS 128
- #define PIC_FLAG_REPEAT_FIRST_FIELD 256
- #define PIC_MASK_COMPOSITE_DISPLAY 0xfffff000
- typedef struct {
- unsigned int temporal_reference;
- unsigned int nb_fields;
- uint32_t pts;
- uint32_t flags;
- struct {
- int x, y;
- } display_offset[3];
- __int64 rtStart, rtStop;
- bool fDiscontinuity, fDelivered;
- } mpeg2_picture_t;
- typedef struct {
- uint8_t* buf[3];
- void* id;
- } mpeg2_fbuf_t;
- typedef enum {
- STATE_BUFFER = 0,
- STATE_SEQUENCE = 1,
- STATE_SEQUENCE_REPEATED = 2,
- STATE_GOP = 3,
- STATE_PICTURE = 4,
- STATE_SLICE_1ST = 5,
- STATE_PICTURE_2ND = 6,
- STATE_SLICE = 7,
- STATE_END = 8,
- STATE_INVALID = 9,
- STATE_PADDING = 10
- } mpeg2_state_t;
- ////////////////////////////////////////////////////////////////////////////////////////////////
- ////////////////////////////////////////////////////////////////////////////////////////////////
- /* macroblock modes */
- #define MACROBLOCK_INTRA 1
- #define MACROBLOCK_PATTERN 2
- #define MACROBLOCK_MOTION_BACKWARD 4
- #define MACROBLOCK_MOTION_FORWARD 8
- #define MACROBLOCK_QUANT 16
- #define DCT_TYPE_INTERLACED 32
- /* motion_type */
- #define MOTION_TYPE_MASK (3*64)
- #define MOTION_TYPE_BASE 64
- #define MC_FIELD (1*64)
- #define MC_FRAME (2*64)
- #define MC_16X8 (2*64)
- #define MC_DMV (3*64)
- /* picture structure */
- #define TOP_FIELD 1
- #define BOTTOM_FIELD 2
- #define FRAME_PICTURE 3
- /* picture coding type */
- #define I_TYPE 1
- #define P_TYPE 2
- #define B_TYPE 3
- #define D_TYPE 4
- ////////////////////////////////////////////////////////////////////////////////////////////////
- ////////////////////////////////////////////////////////////////////////////////////////////////
- typedef void mpeg2_mc_fct(uint8_t*, const uint8_t*, int, int);
- typedef struct {mpeg2_mc_fct* put[8]; mpeg2_mc_fct* avg[8];} mpeg2_mc_t;
- class CMpeg2Decoder
- {
- public:
- /* Motion vectors */
- /* The f_ and b_ correspond to the forward and backward motion */
- /* predictors */
- struct motion_t {
- uint8_t* ref[2][3];
- uint8_t** ref2[2];
- int pmv[2][2];
- int f_code[2];
- } m_b_motion, m_f_motion;
- private:
- int get_macroblock_modes();
- int get_quantizer_scale();
- int get_motion_delta(const int f_code);
- int bound_motion_vector(const int vector, const int f_code);
- int get_dmv();
- int get_coded_block_pattern();
- int get_luma_dc_dct_diff();
- int get_chroma_dc_dct_diff();
-
- void get_intra_block_B14();
- void get_intra_block_B15();
- int get_non_intra_block();
- void get_mpeg1_intra_block();
- int get_mpeg1_non_intra_block();
- void slice_intra_DCT(const int cc, uint8_t* dest, int stride);
- void slice_non_intra_DCT(uint8_t* dest, int stride);
- void motion_mp1(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fr_frame(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fr_field(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fr_dmv(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_reuse(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_zero(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fr_conceal();
- void motion_fi_field(motion_t * motion, mpeg2_mc_fct * const * const table);
- void motion_fi_16x8(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fi_dmv(motion_t* motion, mpeg2_mc_fct * const * const table);
- void motion_fi_conceal();
- int slice_init(int code);
- static bool m_idct_initialized;
- void (*m_idct_init)();
- void (*m_idct_copy)(int16_t* block, uint8_t* dest, const int stride);
- void (*m_idct_add)(const int last, int16_t* block, uint8_t* dest, const int stride);
- mpeg2_mc_t* m_mc;
- public:
- CMpeg2Decoder();
- virtual ~CMpeg2Decoder();
- void mpeg2_init_fbuf(uint8_t* current_fbuf[3], uint8_t* forward_fbuf[3], uint8_t* backward_fbuf[3]);
- void mpeg2_slice(int code, const uint8_t* buffer);
- int16_t* m_DCTblock;
- /* bit parsing stuff */
- uint32_t m_bitstream_buf; /* current 32 bit working set */
- int m_bitstream_bits; /* used bits in working set */
- const uint8_t* m_bitstream_ptr; /* buffer with stream data */
- uint8_t* m_dest[3];
- uint8_t* m_picture_dest[3];
- int m_offset, m_stride, m_uv_stride;
- unsigned int m_limit_x, m_limit_y_16, m_limit_y_8, m_limit_y;
- /* predictor for DC coefficients in intra blocks */
- int16_t m_dc_dct_pred[3];
- int m_quantizer_scale; /* remove */
- int m_dmv_offset; /* remove */
- unsigned int m_v_offset; /* remove */
- /* now non-slice-specific information */
- /* sequence header stuff */
- uint8_t m_intra_quantizer_matrix[64];
- uint8_t m_non_intra_quantizer_matrix[64];
- /* The width and height of the picture snapped to macroblock units */
- int m_width, m_height;
- int m_vertical_position_extension;
- /* picture header stuff */
- /* what type of picture this is (I, P, B, D) */
- int m_coding_type;
- /* picture coding extension stuff */
- /* quantization factor for intra dc coefficients */
- int m_intra_dc_precision;
- /* top/bottom/both fields */
- int m_picture_structure;
- /* bool to indicate all predictions are frame based */
- int m_frame_pred_frame_dct;
- /* bool to indicate whether intra blocks have motion vectors */
- /* (for concealment) */
- int m_concealment_motion_vectors;
- /* bit to indicate which quantization table to use */
- int m_q_scale_type;
- /* bool to use different vlc tables */
- int m_intra_vlc_format;
- /* used for DMV MC */
- int m_top_field_first;
- /* stuff derived from bitstream */
- /* pointer to the zigzag scan we're supposed to be using */
- const uint8_t* m_scan;
- int m_second_field;
- int m_mpeg1;
- };
- class CMpeg2Info
- {
- public:
- CMpeg2Info();
- virtual ~CMpeg2Info();
- void Reset();
- mpeg2_sequence_t* m_sequence;
- mpeg2_gop_t* m_gop;
- mpeg2_picture_t* m_current_picture;
- mpeg2_picture_t* m_current_picture_2nd;
- mpeg2_fbuf_t* m_current_fbuf;
- mpeg2_picture_t* m_display_picture;
- mpeg2_picture_t* m_display_picture_2nd;
- mpeg2_fbuf_t* m_display_fbuf;
- mpeg2_fbuf_t* m_discard_fbuf;
- const uint8_t* m_user_data;
- int m_user_data_len;
- };
- class CMpeg2Dec
- {
- int skip_chunk(int bytes);
- int copy_chunk(int bytes);
- mpeg2_state_t seek_chunk(), seek_header(), seek_sequence();
- int sequence_ext();
- int sequence_display_ext();
- int quant_matrix_ext();
- int copyright_ext();
- int picture_display_ext();
- int picture_coding_ext();
- public:
- CMpeg2Dec();
- virtual ~CMpeg2Dec();
- void mpeg2_init();
- void mpeg2_close();
- void mpeg2_buffer(uint8_t* start, uint8_t* end);
- int mpeg2_getpos();
- mpeg2_state_t mpeg2_parse();
- void mpeg2_skip(int skip);
- void mpeg2_slice_region(int start, int end);
- void mpeg2_pts(uint32_t pts);
- /* decode.c */
- mpeg2_state_t mpeg2_seek_sequence();
- mpeg2_state_t mpeg2_parse_header();
- /* header.c */
- void mpeg2_header_state_init();
- int mpeg2_header_sequence();
- int mpeg2_header_gop();
- mpeg2_state_t mpeg2_header_picture_start();
- int mpeg2_header_picture();
- int mpeg2_header_extension();
- int mpeg2_header_user_data();
- void mpeg2_header_matrix_finalize();
- void mpeg2_header_sequence_finalize();
- mpeg2_state_t mpeg2_header_slice_start();
- mpeg2_state_t mpeg2_header_end();
- void mpeg2_set_fbuf(int coding_type);
- enum {BUFFER_SIZE = 1194 * 1024};
- CMpeg2Decoder m_decoder;
- CMpeg2Info m_info;
- uint32_t m_shift;
- int m_is_display_initialized;
- mpeg2_state_t (CMpeg2Dec::* m_action)();
- mpeg2_state_t m_state;
- uint32_t m_ext_state;
- /* allocated in init - gcc has problems allocating such big structures */
- uint8_t* m_chunk_buffer;
- /* pointer to start of the current chunk */
- uint8_t* m_chunk_start;
- /* pointer to current position in chunk_buffer */
- uint8_t* m_chunk_ptr;
- /* last start code ? */
- uint8_t m_code;
- /* PTS */
- uint32_t m_pts_current, m_pts_previous;
- int m_num_pts;
- int m_bytes_since_pts;
- bool m_first;
- int m_alloc_index;
- uint8_t m_first_decode_slice;
- uint8_t m_nb_decode_slices;
- mpeg2_sequence_t m_new_sequence;
- mpeg2_sequence_t m_sequence;
- mpeg2_gop_t m_gop;
- mpeg2_picture_t m_pictures[4];
- mpeg2_picture_t* m_picture;
- /*const*/ mpeg2_fbuf_t* m_fbuf[3]; /* 0: current fbuf, 1-2: prediction fbufs */
- mpeg2_fbuf_t m_fbuf_alloc[3];
- uint8_t* m_buf_start;
- uint8_t* m_buf_end;
- int16_t m_display_offset_x, m_display_offset_y;
- int m_copy_matrix;
- uint8_t m_intra_quantizer_matrix[64];
- uint8_t m_non_intra_quantizer_matrix[64];
- };