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) */
78 UINT8 *mbintra_table; /* used to kill a few memsets */
83 /* motion compensation */
85 int h263_long_vectors; /* use horrible h263v1 long vector mode */
87 int f_code; /* resolution */
88 INT16 (*motion_val)[2]; /* used for MV prediction */
91 #define MV_DIR_BACKWARD 1
92 #define MV_DIR_FORWARD 2
94 #define MV_TYPE_16X16 0 /* 1 vector for the whole mb */
95 #define MV_TYPE_8X8 1 /* 4 vectors (h263) */
96 #define MV_TYPE_16X8 2 /* 2 vectors, one per 16x8 block */
97 #define MV_TYPE_FIELD 3 /* 2 vectors, one per field */
98 #define MV_TYPE_DMV 4 /* 2 vectors, special mpeg2 Dual Prime Vectors */
99 /* motion vectors for a macroblock
100 first coordinate : 0 = forward 1 = backward
101 second " : depend on type
102 third " : 0 = x, 1 = y
105 int field_select[2][2];
106 int last_mv[2][2][2];
109 int no_rounding; /* apply no rounding to motion estimation (MPEG4) */
111 /* macroblock layer */
115 /* matrix transmitted in the bitstream */
116 UINT16 intra_matrix[64];
117 UINT16 chroma_intra_matrix[64];
118 UINT16 non_intra_matrix[64];
119 UINT16 chroma_non_intra_matrix[64];
120 /* precomputed matrix (combine qscale and DCT renorm) */
121 int q_intra_matrix[64];
122 int q_non_intra_matrix[64];
123 int block_last_index[6]; /* last non zero coefficient in block */
125 void *opaque; /* private data for the user */
127 /* bit rate control */
128 int I_frame_bits; /* wanted number of bits per I frame */
129 int P_frame_bits; /* same for P frame */
138 /* H.263+ specific */
143 int time_increment_bits;
145 int vol_sprite_usage;
149 int rv10_version; /* RV10 version: 0 or 3 */
150 int rv10_first_dc_coded[3];
153 struct MJpegContext *mjpeg_ctx;
155 /* MSMPEG4 specific */
158 int rl_chroma_table_index;
160 int use_skip_mb_code;
161 int slice_height; /* in macroblocks */
162 int first_slice_line;
163 int flipflop_rounding;
165 /* decompression specific */
168 /* MPEG2 specific - I wish I had not to support this mess. */
169 int progressive_sequence;
170 int mpeg_f_code[2][2];
171 int picture_structure;
173 #define PICT_TOP_FIELD 1
174 #define PICT_BOTTOM_FIELD 2
177 int intra_dc_precision;
178 int frame_pred_frame_dct;
180 int concealment_motion_vectors;
182 int intra_vlc_format;
184 int repeat_first_field;
186 int progressive_frame;
195 int rtp_payload_size;
197 UINT8 *ptr_last_mb_line;
198 UINT32 mb_line_avgsize;
200 DCTELEM block[6][64] __align8;
201 void (*dct_unquantize)(struct MpegEncContext *s,
202 DCTELEM *block, int n, int qscale);
205 int MPV_common_init(MpegEncContext *s);
206 void MPV_common_end(MpegEncContext *s);
207 void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
208 void MPV_frame_start(MpegEncContext *s);
209 void MPV_frame_end(MpegEncContext *s);
211 void MPV_common_init_mmx(MpegEncContext *s);
216 int estimate_motion(MpegEncContext *s,
218 int *mx_ptr, int *my_ptr);
221 extern INT16 default_intra_matrix[64];
222 extern INT16 default_non_intra_matrix[64];
224 void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
225 void mpeg1_encode_mb(MpegEncContext *s,
226 DCTELEM block[6][64],
227 int motion_x, int motion_y);
231 /* run length table */
235 typedef struct RLTable {
236 int n; /* number of entries of table_vlc minus 1 */
237 int last; /* number of values for last = 0 */
238 const UINT16 (*table_vlc)[2];
239 const INT8 *table_run;
240 const INT8 *table_level;
241 UINT8 *index_run[2]; /* encoding only */
242 INT8 *max_level[2]; /* encoding & decoding */
243 INT8 *max_run[2]; /* encoding & decoding */
244 VLC vlc; /* decoding only */
247 void init_rl(RLTable *rl);
248 void init_vlc_rl(RLTable *rl);
250 extern inline int get_rl_index(const RLTable *rl, int last, int run, int level)
253 index = rl->index_run[last][run];
256 if (level > rl->max_level[last][run])
258 return index + level - 1;
261 void h263_encode_mb(MpegEncContext *s,
262 DCTELEM block[6][64],
263 int motion_x, int motion_y);
264 void h263_encode_picture_header(MpegEncContext *s, int picture_number);
265 int h263_encode_gob_header(MpegEncContext * s, int mb_line);
266 void h263_dc_scale(MpegEncContext *s);
267 INT16 *h263_pred_motion(MpegEncContext * s, int block,
269 void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
271 void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
272 void h263_encode_init_vlc(MpegEncContext *s);
274 void h263_decode_init_vlc(MpegEncContext *s);
275 int h263_decode_picture_header(MpegEncContext *s);
276 int h263_decode_gob_header(MpegEncContext *s);
277 int mpeg4_decode_picture_header(MpegEncContext * s);
278 int intel_h263_decode_picture_header(MpegEncContext *s);
279 int h263_decode_mb(MpegEncContext *s,
280 DCTELEM block[6][64]);
281 int h263_get_picture_format(int width, int height);
284 void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
285 int rv_decode_dc(MpegEncContext *s, int n);
288 void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
289 void msmpeg4_encode_ext_header(MpegEncContext * s);
290 void msmpeg4_encode_mb(MpegEncContext * s,
291 DCTELEM block[6][64],
292 int motion_x, int motion_y);
293 void msmpeg4_dc_scale(MpegEncContext * s);
294 int msmpeg4_decode_picture_header(MpegEncContext * s);
295 int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
296 int msmpeg4_decode_mb(MpegEncContext *s,
297 DCTELEM block[6][64]);
298 int msmpeg4_decode_init_vlc(MpegEncContext *s);
302 int mjpeg_init(MpegEncContext *s);
303 void mjpeg_close(MpegEncContext *s);
304 void mjpeg_encode_mb(MpegEncContext *s,
305 DCTELEM block[6][64]);
306 void mjpeg_picture_header(MpegEncContext *s);
307 void mjpeg_picture_trailer(MpegEncContext *s);