| 1 | /* |
| 2 | * MPEG4 encoder/decoder internal header. |
| 3 | * Copyright (c) 2000,2001 Fabrice Bellard |
| 4 | * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at> |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #ifndef AVCODEC_MPEG4VIDEO_H |
| 24 | #define AVCODEC_MPEG4VIDEO_H |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | |
| 28 | #include "get_bits.h" |
| 29 | #include "mpegvideo.h" |
| 30 | #include "rl.h" |
| 31 | |
| 32 | // shapes |
| 33 | #define RECT_SHAPE 0 |
| 34 | #define BIN_SHAPE 1 |
| 35 | #define BIN_ONLY_SHAPE 2 |
| 36 | #define GRAY_SHAPE 3 |
| 37 | |
| 38 | #define SIMPLE_VO_TYPE 1 |
| 39 | #define CORE_VO_TYPE 3 |
| 40 | #define MAIN_VO_TYPE 4 |
| 41 | #define NBIT_VO_TYPE 5 |
| 42 | #define ARTS_VO_TYPE 10 |
| 43 | #define ACE_VO_TYPE 12 |
| 44 | #define ADV_SIMPLE_VO_TYPE 17 |
| 45 | |
| 46 | // aspect_ratio_info |
| 47 | #define EXTENDED_PAR 15 |
| 48 | |
| 49 | //vol_sprite_usage / sprite_enable |
| 50 | #define STATIC_SPRITE 1 |
| 51 | #define GMC_SPRITE 2 |
| 52 | |
| 53 | #define MOTION_MARKER 0x1F001 |
| 54 | #define DC_MARKER 0x6B001 |
| 55 | |
| 56 | #define VOS_STARTCODE 0x1B0 |
| 57 | #define USER_DATA_STARTCODE 0x1B2 |
| 58 | #define GOP_STARTCODE 0x1B3 |
| 59 | #define VISUAL_OBJ_STARTCODE 0x1B5 |
| 60 | #define VOP_STARTCODE 0x1B6 |
| 61 | |
| 62 | typedef struct Mpeg4DecContext { |
| 63 | MpegEncContext m; |
| 64 | |
| 65 | /// number of bits to represent the fractional part of time |
| 66 | int time_increment_bits; |
| 67 | int shape; |
| 68 | int vol_sprite_usage; |
| 69 | int sprite_brightness_change; |
| 70 | int num_sprite_warping_points; |
| 71 | /// sprite trajectory points |
| 72 | uint16_t sprite_traj[4][2]; |
| 73 | /// sprite shift [isChroma] |
| 74 | int sprite_shift[2]; |
| 75 | |
| 76 | // reversible vlc |
| 77 | int rvlc; |
| 78 | /// could this stream contain resync markers |
| 79 | int resync_marker; |
| 80 | /// time distance of first I -> B, used for interlaced B-frames |
| 81 | int t_frame; |
| 82 | |
| 83 | int new_pred; |
| 84 | int enhancement_type; |
| 85 | int scalability; |
| 86 | int use_intra_dc_vlc; |
| 87 | |
| 88 | /// QP above which the ac VLC should be used for intra dc |
| 89 | int intra_dc_threshold; |
| 90 | |
| 91 | /* bug workarounds */ |
| 92 | int divx_version; |
| 93 | int divx_build; |
| 94 | int xvid_build; |
| 95 | int lavc_build; |
| 96 | |
| 97 | /// flag for having shown the warning about invalid Divx B-frames |
| 98 | int showed_packed_warning; |
| 99 | /** does the stream contain the low_delay flag, |
| 100 | * used to work around buggy encoders. */ |
| 101 | int vol_control_parameters; |
| 102 | int cplx_estimation_trash_i; |
| 103 | int cplx_estimation_trash_p; |
| 104 | int cplx_estimation_trash_b; |
| 105 | } Mpeg4DecContext; |
| 106 | |
| 107 | /* dc encoding for mpeg4 */ |
| 108 | extern const uint8_t ff_mpeg4_DCtab_lum[13][2]; |
| 109 | extern const uint8_t ff_mpeg4_DCtab_chrom[13][2]; |
| 110 | |
| 111 | extern const uint16_t ff_mpeg4_intra_vlc[103][2]; |
| 112 | extern const int8_t ff_mpeg4_intra_level[102]; |
| 113 | extern const int8_t ff_mpeg4_intra_run[102]; |
| 114 | |
| 115 | extern RLTable ff_mpeg4_rl_intra; |
| 116 | |
| 117 | /* Note this is identical to the intra rvlc except that it is reordered. */ |
| 118 | extern RLTable ff_rvlc_rl_inter; |
| 119 | extern RLTable ff_rvlc_rl_intra; |
| 120 | |
| 121 | extern const uint16_t ff_sprite_trajectory_tab[15][2]; |
| 122 | extern const uint8_t ff_mb_type_b_tab[4][2]; |
| 123 | |
| 124 | /* these matrixes will be permuted for the idct */ |
| 125 | extern const int16_t ff_mpeg4_default_intra_matrix[64]; |
| 126 | extern const int16_t ff_mpeg4_default_non_intra_matrix[64]; |
| 127 | |
| 128 | extern const uint8_t ff_mpeg4_y_dc_scale_table[32]; |
| 129 | extern const uint8_t ff_mpeg4_c_dc_scale_table[32]; |
| 130 | extern const uint16_t ff_mpeg4_resync_prefix[8]; |
| 131 | |
| 132 | extern const uint8_t ff_mpeg4_dc_threshold[8]; |
| 133 | |
| 134 | void ff_mpeg4_encode_mb(MpegEncContext *s, |
| 135 | int16_t block[6][64], |
| 136 | int motion_x, int motion_y); |
| 137 | void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, |
| 138 | int dir); |
| 139 | void ff_set_mpeg4_time(MpegEncContext *s); |
| 140 | void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number); |
| 141 | |
| 142 | int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb); |
| 143 | void ff_mpeg4_encode_video_packet_header(MpegEncContext *s); |
| 144 | void ff_mpeg4_clean_buffers(MpegEncContext *s); |
| 145 | void ff_mpeg4_stuffing(PutBitContext *pbc); |
| 146 | void ff_mpeg4_init_partitions(MpegEncContext *s); |
| 147 | void ff_mpeg4_merge_partitions(MpegEncContext *s); |
| 148 | void ff_clean_mpeg4_qscales(MpegEncContext *s); |
| 149 | int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx); |
| 150 | int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s); |
| 151 | int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx); |
| 152 | void ff_mpeg4_init_direct_mv(MpegEncContext *s); |
| 153 | void ff_mpeg4videodec_static_init(void); |
| 154 | int ff_mpeg4_workaround_bugs(AVCodecContext *avctx); |
| 155 | int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size); |
| 156 | |
| 157 | /** |
| 158 | * |
| 159 | * @return the mb_type |
| 160 | */ |
| 161 | int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my); |
| 162 | |
| 163 | extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3]; |
| 164 | |
| 165 | #if 0 //3IV1 is quite rare and it slows things down a tiny bit |
| 166 | #define IS_3IV1 s->codec_tag == AV_RL32("3IV1") |
| 167 | #else |
| 168 | #define IS_3IV1 0 |
| 169 | #endif |
| 170 | |
| 171 | /** |
| 172 | * Predict the dc. |
| 173 | * encoding quantized level -> quantized diff |
| 174 | * decoding quantized diff -> quantized level |
| 175 | * @param n block index (0-3 are luma, 4-5 are chroma) |
| 176 | * @param dir_ptr pointer to an integer where the prediction direction will be stored |
| 177 | */ |
| 178 | static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level, |
| 179 | int *dir_ptr, int encoding) |
| 180 | { |
| 181 | int a, b, c, wrap, pred, scale, ret; |
| 182 | int16_t *dc_val; |
| 183 | |
| 184 | /* find prediction */ |
| 185 | if (n < 4) |
| 186 | scale = s->y_dc_scale; |
| 187 | else |
| 188 | scale = s->c_dc_scale; |
| 189 | if (IS_3IV1) |
| 190 | scale = 8; |
| 191 | |
| 192 | wrap = s->block_wrap[n]; |
| 193 | dc_val = s->dc_val[0] + s->block_index[n]; |
| 194 | |
| 195 | /* B C |
| 196 | * A X |
| 197 | */ |
| 198 | a = dc_val[-1]; |
| 199 | b = dc_val[-1 - wrap]; |
| 200 | c = dc_val[-wrap]; |
| 201 | |
| 202 | /* outside slice handling (we can't do that by memset as we need the |
| 203 | * dc for error resilience) */ |
| 204 | if (s->first_slice_line && n != 3) { |
| 205 | if (n != 2) |
| 206 | b = c = 1024; |
| 207 | if (n != 1 && s->mb_x == s->resync_mb_x) |
| 208 | b = a = 1024; |
| 209 | } |
| 210 | if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) { |
| 211 | if (n == 0 || n == 4 || n == 5) |
| 212 | b = 1024; |
| 213 | } |
| 214 | |
| 215 | if (abs(a - b) < abs(b - c)) { |
| 216 | pred = c; |
| 217 | *dir_ptr = 1; /* top */ |
| 218 | } else { |
| 219 | pred = a; |
| 220 | *dir_ptr = 0; /* left */ |
| 221 | } |
| 222 | /* we assume pred is positive */ |
| 223 | pred = FASTDIV((pred + (scale >> 1)), scale); |
| 224 | |
| 225 | if (encoding) { |
| 226 | ret = level - pred; |
| 227 | } else { |
| 228 | level += pred; |
| 229 | ret = level; |
| 230 | if (s->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) { |
| 231 | if (level < 0) { |
| 232 | av_log(s->avctx, AV_LOG_ERROR, |
| 233 | "dc<0 at %dx%d\n", s->mb_x, s->mb_y); |
| 234 | return -1; |
| 235 | } |
| 236 | if (level * scale > 2048 + scale) { |
| 237 | av_log(s->avctx, AV_LOG_ERROR, |
| 238 | "dc overflow at %dx%d\n", s->mb_x, s->mb_y); |
| 239 | return -1; |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | level *= scale; |
| 244 | if (level & (~2047)) { |
| 245 | if (level < 0) |
| 246 | level = 0; |
| 247 | else if (!(s->workaround_bugs & FF_BUG_DC_CLIP)) |
| 248 | level = 2047; |
| 249 | } |
| 250 | dc_val[0] = level; |
| 251 | |
| 252 | return ret; |
| 253 | } |
| 254 | |
| 255 | #endif /* AVCODEC_MPEG4VIDEO_H */ |