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https://github.com/FFmpeg/FFmpeg.git
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304 lines
10 KiB
C
304 lines
10 KiB
C
/*
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* Generic DCT based hybrid video encoder
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* Copyright (c) 2000,2001 Gerard Lantau.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* Macros for picture code type. */
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#define I_TYPE 1
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#define P_TYPE 2
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#define B_TYPE 3
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enum OutputFormat {
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FMT_MPEG1,
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FMT_H263,
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FMT_MJPEG,
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};
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#define MPEG_BUF_SIZE (16 * 1024)
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typedef struct MpegEncContext {
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struct AVCodecContext *avctx;
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/* the following parameters must be initialized before encoding */
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int width, height; /* picture size. must be a multiple of 16 */
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int gop_size;
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int frame_rate; /* number of frames per second */
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int intra_only; /* if true, only intra pictures are generated */
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int bit_rate; /* wanted bit rate */
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enum OutputFormat out_format; /* output format */
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int h263_plus; /* h263 plus headers */
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int h263_rv10; /* use RV10 variation for H263 */
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int h263_pred; /* use mpeg4/h263 ac/dc predictions */
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int h263_msmpeg4; /* generate MSMPEG4 compatible stream */
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int h263_intel; /* use I263 intel h263 header */
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int fixed_qscale; /* fixed qscale if non zero */
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int encoding; /* true if we are encoding (vs decoding) */
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/* the following fields are managed internally by the encoder */
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/* bit output */
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PutBitContext pb;
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/* sequence parameters */
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int context_initialized;
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int picture_number;
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int fake_picture_number; /* picture number at the bitstream frame rate */
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int gop_picture_number; /* index of the first picture of a GOP */
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int mb_width, mb_height;
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int linesize; /* line size, in bytes, may be different from width */
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UINT8 *new_picture[3]; /* picture to be compressed */
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UINT8 *last_picture[3]; /* previous picture */
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UINT8 *last_picture_base[3]; /* real start of the picture */
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UINT8 *next_picture[3]; /* previous picture (for bidir pred) */
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UINT8 *next_picture_base[3]; /* real start of the picture */
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UINT8 *aux_picture[3]; /* aux picture (for B frames only) */
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UINT8 *aux_picture_base[3]; /* real start of the picture */
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UINT8 *current_picture[3]; /* buffer to store the decompressed current picture */
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int last_dc[3]; /* last DC values for MPEG1 */
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INT16 *dc_val[3]; /* used for mpeg4 DC prediction */
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int y_dc_scale, c_dc_scale;
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UINT8 *coded_block; /* used for coded block pattern prediction */
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INT16 (*ac_val[3])[16]; /* used for for mpeg4 AC prediction */
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int ac_pred;
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int mb_skiped; /* MUST BE SET only during DECODING */
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UINT8 *mbskip_table; /* used to avoid copy if macroblock
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skipped (for black regions for example) */
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UINT8 *mbintra_table; /* used to kill a few memsets */
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int qscale;
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int pict_type;
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int frame_rate_index;
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/* motion compensation */
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int unrestricted_mv;
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int h263_long_vectors; /* use horrible h263v1 long vector mode */
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int f_code; /* resolution */
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INT16 (*motion_val)[2]; /* used for MV prediction */
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int full_search;
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int mv_dir;
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#define MV_DIR_BACKWARD 1
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#define MV_DIR_FORWARD 2
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int mv_type;
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#define MV_TYPE_16X16 0 /* 1 vector for the whole mb */
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#define MV_TYPE_8X8 1 /* 4 vectors (h263) */
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#define MV_TYPE_16X8 2 /* 2 vectors, one per 16x8 block */
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#define MV_TYPE_FIELD 3 /* 2 vectors, one per field */
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#define MV_TYPE_DMV 4 /* 2 vectors, special mpeg2 Dual Prime Vectors */
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/* motion vectors for a macroblock
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first coordinate : 0 = forward 1 = backward
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second " : depend on type
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third " : 0 = x, 1 = y
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*/
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int mv[2][4][2];
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int field_select[2][2];
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int last_mv[2][2][2];
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int has_b_frames;
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int no_rounding; /* apply no rounding to motion estimation (MPEG4) */
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/* macroblock layer */
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int mb_x, mb_y;
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int mb_incr;
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int mb_intra;
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/* matrix transmitted in the bitstream */
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UINT16 intra_matrix[64];
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UINT16 chroma_intra_matrix[64];
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UINT16 non_intra_matrix[64];
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UINT16 chroma_non_intra_matrix[64];
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/* precomputed matrix (combine qscale and DCT renorm) */
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int q_intra_matrix[64];
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int q_non_intra_matrix[64];
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int block_last_index[6]; /* last non zero coefficient in block */
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void *opaque; /* private data for the user */
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/* bit rate control */
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int I_frame_bits; /* wanted number of bits per I frame */
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int P_frame_bits; /* same for P frame */
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INT64 wanted_bits;
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INT64 total_bits;
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/* H.263 specific */
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int gob_number;
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int gob_index;
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int first_gob_line;
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/* H.263+ specific */
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int umvplus;
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int umvplus_dec;
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/* mpeg4 specific */
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int time_increment_bits;
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int shape;
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int vol_sprite_usage;
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int quant_precision;
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/* RV10 specific */
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int rv10_version; /* RV10 version: 0 or 3 */
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int rv10_first_dc_coded[3];
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/* MJPEG specific */
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struct MJpegContext *mjpeg_ctx;
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/* MSMPEG4 specific */
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int mv_table_index;
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int rl_table_index;
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int rl_chroma_table_index;
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int dc_table_index;
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int use_skip_mb_code;
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int slice_height; /* in macroblocks */
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int first_slice_line;
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/* decompression specific */
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GetBitContext gb;
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/* MPEG2 specific - I wish I had not to support this mess. */
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int progressive_sequence;
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int mpeg_f_code[2][2];
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int picture_structure;
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/* picture type */
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#define PICT_TOP_FIELD 1
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#define PICT_BOTTOM_FIELD 2
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#define PICT_FRAME 3
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int intra_dc_precision;
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int frame_pred_frame_dct;
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int top_field_first;
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int concealment_motion_vectors;
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int q_scale_type;
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int intra_vlc_format;
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int alternate_scan;
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int repeat_first_field;
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int chroma_420_type;
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int progressive_frame;
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int mpeg2;
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int full_pel[2];
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int interlaced_dct;
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int last_qscale;
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int first_slice;
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/* RTP specific */
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int rtp_mode;
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int rtp_payload_size;
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UINT8 *ptr_lastgob;
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UINT8 *ptr_last_mb_line;
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UINT32 mb_line_avgsize;
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DCTELEM block[6][64] __align8;
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void (*dct_unquantize)(struct MpegEncContext *s,
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DCTELEM *block, int n, int qscale);
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} MpegEncContext;
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int MPV_common_init(MpegEncContext *s);
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void MPV_common_end(MpegEncContext *s);
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void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
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void MPV_frame_start(MpegEncContext *s);
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void MPV_frame_end(MpegEncContext *s);
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#ifdef HAVE_MMX
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void MPV_common_init_mmx(MpegEncContext *s);
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#endif
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/* motion_est.c */
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int estimate_motion(MpegEncContext *s,
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int mb_x, int mb_y,
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int *mx_ptr, int *my_ptr);
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/* mpeg12.c */
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extern INT16 default_intra_matrix[64];
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extern INT16 default_non_intra_matrix[64];
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void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
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void mpeg1_encode_mb(MpegEncContext *s,
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DCTELEM block[6][64],
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int motion_x, int motion_y);
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/* h263enc.c */
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/* run length table */
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#define MAX_RUN 64
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#define MAX_LEVEL 64
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typedef struct RLTable {
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int n; /* number of entries of table_vlc minus 1 */
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int last; /* number of values for last = 0 */
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const UINT16 (*table_vlc)[2];
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const INT8 *table_run;
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const INT8 *table_level;
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UINT8 *index_run[2]; /* encoding only */
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INT8 *max_level[2]; /* encoding & decoding */
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INT8 *max_run[2]; /* encoding & decoding */
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VLC vlc; /* decoding only */
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} RLTable;
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void init_rl(RLTable *rl);
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void init_vlc_rl(RLTable *rl);
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extern inline int get_rl_index(const RLTable *rl, int last, int run, int level)
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{
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int index;
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index = rl->index_run[last][run];
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if (index >= rl->n)
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return rl->n;
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if (level > rl->max_level[last][run])
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return rl->n;
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return index + level - 1;
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}
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void h263_encode_mb(MpegEncContext *s,
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DCTELEM block[6][64],
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int motion_x, int motion_y);
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void h263_encode_picture_header(MpegEncContext *s, int picture_number);
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int h263_encode_gob_header(MpegEncContext * s, int mb_line);
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void h263_dc_scale(MpegEncContext *s);
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INT16 *h263_pred_motion(MpegEncContext * s, int block,
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int *px, int *py);
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void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
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int dir);
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void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
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void h263_encode_init_vlc(MpegEncContext *s);
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void h263_decode_init_vlc(MpegEncContext *s);
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int h263_decode_picture_header(MpegEncContext *s);
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int h263_decode_gob_header(MpegEncContext *s);
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int mpeg4_decode_picture_header(MpegEncContext * s);
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int intel_h263_decode_picture_header(MpegEncContext *s);
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int h263_decode_mb(MpegEncContext *s,
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DCTELEM block[6][64]);
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int h263_get_picture_format(int width, int height);
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/* rv10.c */
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void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
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int rv_decode_dc(MpegEncContext *s, int n);
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/* msmpeg4.c */
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void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
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void msmpeg4_encode_mb(MpegEncContext * s,
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DCTELEM block[6][64],
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int motion_x, int motion_y);
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void msmpeg4_dc_scale(MpegEncContext * s);
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int msmpeg4_decode_picture_header(MpegEncContext * s);
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int msmpeg4_decode_mb(MpegEncContext *s,
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DCTELEM block[6][64]);
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int msmpeg4_decode_init_vlc(MpegEncContext *s);
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/* mjpegenc.c */
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int mjpeg_init(MpegEncContext *s);
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void mjpeg_close(MpegEncContext *s);
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void mjpeg_encode_mb(MpegEncContext *s,
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DCTELEM block[6][64]);
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void mjpeg_picture_header(MpegEncContext *s);
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void mjpeg_picture_trailer(MpegEncContext *s);
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