libavcodec/mpeg4video.h

   1 /*
   2  * MPEG-4 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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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     /// QP above which the ac VLC should be used for intra dc
  88     int intra_dc_threshold;
  89
  90     /* bug workarounds */
  91     int divx_version;
  92     int divx_build;
  93     int xvid_build;
  94     int lavc_build;
  95     /// flag for having shown the warning about invalid Divx B-frames
  96     int showed_packed_warning;
  97     /** does the stream contain the low_delay flag,
  98      *  used to work around buggy encoders. */
  99     int vol_control_parameters;
 100     int cplx_estimation_trash_i;
 101     int cplx_estimation_trash_p;
 102     int cplx_estimation_trash_b;
 103 } Mpeg4DecContext;
 104
 105 /* dc encoding for MPEG-4 */
 106 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
 107 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
 108
 109 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
 110 extern const int8_t ff_mpeg4_intra_level[102];
 111 extern const int8_t ff_mpeg4_intra_run[102];
 112
 113 extern RLTable ff_mpeg4_rl_intra;
 114
 115 /* Note this is identical to the intra rvlc except that it is reordered. */
 116 extern RLTable ff_rvlc_rl_inter;
 117 extern RLTable ff_rvlc_rl_intra;
 118
 119 extern const uint16_t ff_sprite_trajectory_tab[15][2];
 120 extern const uint8_t ff_mb_type_b_tab[4][2];
 121
 122 /* these matrixes will be permuted for the idct */
 123 extern const int16_t ff_mpeg4_default_intra_matrix[64];
 124 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
 125
 126 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
 127 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
 128 extern const uint16_t ff_mpeg4_resync_prefix[8];
 129
 130 extern const uint8_t ff_mpeg4_dc_threshold[8];
 131
 132 void ff_mpeg4_encode_mb(MpegEncContext *s,
 133                         int16_t block[6][64],
 134                         int motion_x, int motion_y);
 135 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
 136                       int dir);
 137 void ff_set_mpeg4_time(MpegEncContext *s);
 138 void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
 139
 140 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
 141 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
 142 void ff_mpeg4_clean_buffers(MpegEncContext *s);
 143 void ff_mpeg4_stuffing(PutBitContext *pbc);
 144 void ff_mpeg4_init_partitions(MpegEncContext *s);
 145 void ff_mpeg4_merge_partitions(MpegEncContext *s);
 146 void ff_clean_mpeg4_qscales(MpegEncContext *s);
 147 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
 148 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
 149 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
 150 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
 151 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
 152
 153 /**
 154  * @return the mb_type
 155  */
 156 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
 157
 158 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
 159
 160 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
 161 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
 162 #else
 163 #define IS_3IV1 0
 164 #endif
 165
 166 /**
 167  * Predict the dc.
 168  * encoding quantized level -> quantized diff
 169  * decoding quantized diff -> quantized level
 170  * @param n block index (0-3 are luma, 4-5 are chroma)
 171  * @param dir_ptr pointer to an integer where the prediction direction will be stored
 172  */
 173 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
 174                                    int *dir_ptr, int encoding)
 175 {
 176     int a, b, c, wrap, pred, scale, ret;
 177     int16_t *dc_val;
 178
 179     /* find prediction */
 180     if (n < 4)
 181         scale = s->y_dc_scale;
 182     else
 183         scale = s->c_dc_scale;
 184     if (IS_3IV1)
 185         scale = 8;
 186
 187     wrap   = s->block_wrap[n];
 188     dc_val = s->dc_val[0] + s->block_index[n];
 189
 190     /* B C
 191      * A X
 192      */
 193     a = dc_val[-1];
 194     b = dc_val[-1 - wrap];
 195     c = dc_val[-wrap];
 196
 197     /* outside slice handling (we can't do that by memset as we need the
 198      * dc for error resilience) */
 199     if (s->first_slice_line && n != 3) {
 200         if (n != 2)
 201             b = c = 1024;
 202         if (n != 1 && s->mb_x == s->resync_mb_x)
 203             b = a = 1024;
 204     }
 205     if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
 206         if (n == 0 || n == 4 || n == 5)
 207             b = 1024;
 208     }
 209
 210     if (abs(a - b) < abs(b - c)) {
 211         pred     = c;
 212         *dir_ptr = 1; /* top */
 213     } else {
 214         pred     = a;
 215         *dir_ptr = 0; /* left */
 216     }
 217     /* we assume pred is positive */
 218     pred = FASTDIV((pred + (scale >> 1)), scale);
 219
 220     if (encoding) {
 221         ret = level - pred;
 222     } else {
 223         level += pred;
 224         ret    = level;
 225         if (s->avctx->err_recognition & AV_EF_BITSTREAM) {
 226             if (level < 0) {
 227                 av_log(s->avctx, AV_LOG_ERROR,
 228                        "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
 229                 return -1;
 230             }
 231             if (level * scale > 2048 + scale) {
 232                 av_log(s->avctx, AV_LOG_ERROR,
 233                        "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
 234                 return -1;
 235             }
 236         }
 237     }
 238     level *= scale;
 239     if (level & (~2047)) {
 240         if (level < 0)
 241             level = 0;
 242         else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
 243             level = 2047;
 244     }
 245     dc_val[0] = level;
 246
 247     return ret;
 248 }
 249
 250 #endif /* AVCODEC_MPEG4VIDEO_H */