2 * MPEG4 encoder/decoder internal header.
3 * Copyright (c) 2000,2001 Fabrice Bellard
4 * Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
6 * This file is part of Libav.
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.
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.
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
23 #ifndef AVCODEC_MPEG4VIDEO_H
24 #define AVCODEC_MPEG4VIDEO_H
29 #include "mpegvideo.h"
35 #define BIN_ONLY_SHAPE 2
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
47 #define EXTENDED_PAR 15
49 //vol_sprite_usage / sprite_enable
50 #define STATIC_SPRITE 1
53 #define MOTION_MARKER 0x1F001
54 #define DC_MARKER 0x6B001
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
62 typedef struct Mpeg4DecContext {
65 ///< number of bits to represent the fractional part of time
66 int time_increment_bits;
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]
78 ///< could this stream contain resync markers
80 ///< time distance of first I -> B, used for interlaced b frames
87 ///< QP above whch the ac VLC should be used for intra dc
88 int intra_dc_threshold;
95 ///< flag for having shown the warning about divxs invalid b frames
96 int showed_packed_warning;
97 int vol_control_parameters; /**< does the stream contain the low_delay flag,
98 * used to work around buggy encoders. */
100 int cplx_estimation_trash_i;
101 int cplx_estimation_trash_p;
102 int cplx_estimation_trash_b;
105 /* dc encoding for mpeg4 */
106 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
107 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
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];
113 extern RLTable ff_mpeg4_rl_intra;
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;
119 extern const uint16_t ff_sprite_trajectory_tab[15][2];
120 extern const uint8_t ff_mb_type_b_tab[4][2];
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];
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];
130 extern const uint8_t ff_mpeg4_dc_threshold[8];
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,
137 void ff_set_mpeg4_time(MpegEncContext *s);
138 void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
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);
155 * @return the mb_type
157 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
159 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
161 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
162 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
169 * encoding quantized level -> quantized diff
170 * decoding quantized diff -> quantized level
171 * @param n block index (0-3 are luma, 4-5 are chroma)
172 * @param dir_ptr pointer to an integer where the prediction direction will be stored
174 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
175 int *dir_ptr, int encoding)
177 int a, b, c, wrap, pred, scale, ret;
180 /* find prediction */
182 scale = s->y_dc_scale;
184 scale = s->c_dc_scale;
188 wrap = s->block_wrap[n];
189 dc_val = s->dc_val[0] + s->block_index[n];
195 b = dc_val[-1 - wrap];
198 /* outside slice handling (we can't do that by memset as we need the
199 * dc for error resilience) */
200 if (s->first_slice_line && n != 3) {
203 if (n != 1 && s->mb_x == s->resync_mb_x)
206 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
207 if (n == 0 || n == 4 || n == 5)
211 if (abs(a - b) < abs(b - c)) {
213 *dir_ptr = 1; /* top */
216 *dir_ptr = 0; /* left */
218 /* we assume pred is positive */
219 pred = FASTDIV((pred + (scale >> 1)), scale);
226 if (s->err_recognition & AV_EF_BITSTREAM) {
228 av_log(s->avctx, AV_LOG_ERROR,
229 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
232 if (level * scale > 2048 + scale) {
233 av_log(s->avctx, AV_LOG_ERROR,
234 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
240 if (level & (~2047)) {
243 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
251 #endif /* AVCODEC_MPEG4VIDEO_H */