2 * Generic DCT based hybrid video encoder
3 * Copyright (c) 2000,2001 Gerard Lantau.
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 /* Macros for picture code type. */
31 #define MPEG_BUF_SIZE (16 * 1024)
33 typedef struct MpegEncContext {
34 struct AVCodecContext *avctx;
35 /* the following parameters must be initialized before encoding */
36 int width, height; /* picture size. must be a multiple of 16 */
38 int frame_rate; /* number of frames per second */
39 int intra_only; /* if true, only intra pictures are generated */
40 int bit_rate; /* wanted bit rate */
41 enum OutputFormat out_format; /* output format */
42 int h263_plus; /* h263 plus headers */
43 int h263_rv10; /* use RV10 variation for H263 */
44 int h263_pred; /* use mpeg4/h263 ac/dc predictions */
45 int h263_msmpeg4; /* generate MSMPEG4 compatible stream */
46 int h263_intel; /* use I263 intel h263 header */
47 int fixed_qscale; /* fixed qscale if non zero */
48 int encoding; /* true if we are encoding (vs decoding) */
49 /* the following fields are managed internally by the encoder */
54 /* sequence parameters */
55 int context_initialized;
57 int fake_picture_number; /* picture number at the bitstream frame rate */
58 int gop_picture_number; /* index of the first picture of a GOP */
59 int mb_width, mb_height;
60 int linesize; /* line size, in bytes, may be different from width */
61 UINT8 *new_picture[3]; /* picture to be compressed */
62 UINT8 *last_picture[3]; /* previous picture */
63 UINT8 *last_picture_base[3]; /* real start of the picture */
64 UINT8 *next_picture[3]; /* previous picture (for bidir pred) */
65 UINT8 *next_picture_base[3]; /* real start of the picture */
66 UINT8 *aux_picture[3]; /* aux picture (for B frames only) */
67 UINT8 *aux_picture_base[3]; /* real start of the picture */
68 UINT8 *current_picture[3]; /* buffer to store the decompressed current picture */
69 int last_dc[3]; /* last DC values for MPEG1 */
70 INT16 *dc_val[3]; /* used for mpeg4 DC prediction */
71 int y_dc_scale, c_dc_scale;
72 UINT8 *coded_block; /* used for coded block pattern prediction */
73 INT16 (*ac_val[3])[16]; /* used for for mpeg4 AC prediction */
75 int mb_skiped; /* MUST BE SET only during DECODING */
76 UINT8 *mbskip_table; /* used to avoid copy if macroblock
77 skipped (for black regions for example) */
82 /* motion compensation */
84 int h263_long_vectors; /* use horrible h263v1 long vector mode */
86 int f_code; /* resolution */
87 INT16 (*motion_val)[2]; /* used for MV prediction */
90 #define MV_DIR_BACKWARD 1
91 #define MV_DIR_FORWARD 2
93 #define MV_TYPE_16X16 0 /* 1 vector for the whole mb */
94 #define MV_TYPE_8X8 1 /* 4 vectors (h263) */
95 #define MV_TYPE_16X8 2 /* 2 vectors, one per 16x8 block */
96 #define MV_TYPE_FIELD 3 /* 2 vectors, one per field */
97 #define MV_TYPE_DMV 4 /* 2 vectors, special mpeg2 Dual Prime Vectors */
98 /* motion vectors for a macroblock
99 first coordinate : 0 = forward 1 = backward
100 second " : depend on type
101 third " : 0 = x, 1 = y
104 int field_select[2][2];
105 int last_mv[2][2][2];
108 int no_rounding; /* apply no rounding to motion estimation (MPEG4) */
110 /* macroblock layer */
114 /* matrix transmitted in the bitstream */
115 UINT16 intra_matrix[64];
116 UINT16 chroma_intra_matrix[64];
117 UINT16 non_intra_matrix[64];
118 UINT16 chroma_non_intra_matrix[64];
119 /* precomputed matrix (combine qscale and DCT renorm) */
120 int q_intra_matrix[64];
121 int q_non_intra_matrix[64];
122 int block_last_index[6]; /* last non zero coefficient in block */
124 void *opaque; /* private data for the user */
126 /* bit rate control */
127 int I_frame_bits; /* wanted number of bits per I frame */
128 int P_frame_bits; /* same for P frame */
136 /* H.263+ specific */
141 int time_increment_bits;
143 int vol_sprite_usage;
147 int rv10_version; /* RV10 version: 0 or 3 */
148 int rv10_first_dc_coded[3];
151 struct MJpegContext *mjpeg_ctx;
153 /* MSMPEG4 specific */
156 int rl_chroma_table_index;
158 int use_skip_mb_code;
159 int slice_height; /* in macroblocks */
160 int first_slice_line;
161 /* decompression specific */
164 /* MPEG2 specific - I wish I had not to support this mess. */
165 int progressive_sequence;
166 int mpeg_f_code[2][2];
167 int picture_structure;
169 #define PICT_TOP_FIELD 1
170 #define PICT_BOTTOM_FIELD 2
173 int intra_dc_precision;
174 int frame_pred_frame_dct;
176 int concealment_motion_vectors;
178 int intra_vlc_format;
180 int repeat_first_field;
182 int progressive_frame;
189 DCTELEM block[6][64] __align8;
190 void (*dct_unquantize)(struct MpegEncContext *s,
191 DCTELEM *block, int n, int qscale);
194 int MPV_common_init(MpegEncContext *s);
195 void MPV_common_end(MpegEncContext *s);
196 void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
197 void MPV_frame_start(MpegEncContext *s);
198 void MPV_frame_end(MpegEncContext *s);
200 void MPV_common_init_mmx(MpegEncContext *s);
205 int estimate_motion(MpegEncContext *s,
207 int *mx_ptr, int *my_ptr);
210 extern INT16 default_intra_matrix[64];
211 extern INT16 default_non_intra_matrix[64];
213 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
214 void mpeg1_encode_mb(MpegEncContext *s,
215 DCTELEM block[6][64],
216 int motion_x, int motion_y);
220 /* run length table */
224 typedef struct RLTable {
225 int n; /* number of entries of table_vlc minus 1 */
226 int last; /* number of values for last = 0 */
227 const UINT16 (*table_vlc)[2];
228 const INT8 *table_run;
229 const INT8 *table_level;
230 UINT8 *index_run[2]; /* encoding only */
231 INT8 *max_level[2]; /* encoding & decoding */
232 INT8 *max_run[2]; /* encoding & decoding */
233 VLC vlc; /* decoding only */
236 void init_rl(RLTable *rl);
237 void init_vlc_rl(RLTable *rl);
239 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
242 index = rl->index_run[last][run];
245 if (level > rl->max_level[last][run])
247 return index + level - 1;
250 void h263_encode_mb(MpegEncContext *s,
251 DCTELEM block[6][64],
252 int motion_x, int motion_y);
253 void h263_encode_picture_header(MpegEncContext *s, int picture_number);
254 void h263_dc_scale(MpegEncContext *s);
255 INT16 *h263_pred_motion(MpegEncContext * s, int block,
257 void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
259 void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
260 void h263_encode_init_vlc(MpegEncContext *s);
262 void h263_decode_init_vlc(MpegEncContext *s);
263 int h263_decode_picture_header(MpegEncContext *s);
264 int mpeg4_decode_picture_header(MpegEncContext * s);
265 int intel_h263_decode_picture_header(MpegEncContext *s);
266 int h263_decode_mb(MpegEncContext *s,
267 DCTELEM block[6][64]);
268 int h263_get_picture_format(int width, int height);
271 void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
272 int rv_decode_dc(MpegEncContext *s, int n);
275 void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
276 void msmpeg4_encode_mb(MpegEncContext * s,
277 DCTELEM block[6][64],
278 int motion_x, int motion_y);
279 void msmpeg4_dc_scale(MpegEncContext * s);
280 int msmpeg4_decode_picture_header(MpegEncContext * s);
281 int msmpeg4_decode_mb(MpegEncContext *s,
282 DCTELEM block[6][64]);
283 int msmpeg4_decode_init_vlc(MpegEncContext *s);
287 int mjpeg_init(MpegEncContext *s);
288 void mjpeg_close(MpegEncContext *s);
289 void mjpeg_encode_mb(MpegEncContext *s,
290 DCTELEM block[6][64]);
291 void mjpeg_picture_header(MpegEncContext *s);
292 void mjpeg_picture_trailer(MpegEncContext *s);