2 * MPEG-4 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 FFmpeg.
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.
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.
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
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
46 #define VOT_VIDEO_ID 1
47 #define VOT_STILL_TEXTURE_ID 2
50 #define EXTENDED_PAR 15
52 //vol_sprite_usage / sprite_enable
53 #define STATIC_SPRITE 1
56 #define MOTION_MARKER 0x1F001
57 #define DC_MARKER 0x6B001
59 #define VOS_STARTCODE 0x1B0
60 #define USER_DATA_STARTCODE 0x1B2
61 #define GOP_STARTCODE 0x1B3
62 #define VISUAL_OBJ_STARTCODE 0x1B5
63 #define VOP_STARTCODE 0x1B6
65 /* smaller packets likely don't contain a real frame */
66 #define MAX_NVOP_SIZE 19
68 typedef struct Mpeg4DecContext {
71 /// number of bits to represent the fractional part of time
72 int time_increment_bits;
75 int sprite_brightness_change;
76 int num_sprite_warping_points;
77 /// sprite trajectory points
78 uint16_t sprite_traj[4][2];
79 /// sprite shift [isChroma]
84 /// could this stream contain resync markers
86 /// time distance of first I -> B, used for interlaced B-frames
94 /// QP above which the ac VLC should be used for intra dc
95 int intra_dc_threshold;
103 /// flag for having shown the warning about invalid Divx B-frames
104 int showed_packed_warning;
105 /** does the stream contain the low_delay flag,
106 * used to work around buggy encoders. */
107 int vol_control_parameters;
108 int cplx_estimation_trash_i;
109 int cplx_estimation_trash_p;
110 int cplx_estimation_trash_b;
113 /* dc encoding for MPEG-4 */
114 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
115 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
117 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
118 extern const int8_t ff_mpeg4_intra_level[102];
119 extern const int8_t ff_mpeg4_intra_run[102];
121 extern RLTable ff_mpeg4_rl_intra;
123 /* Note this is identical to the intra rvlc except that it is reordered. */
124 extern RLTable ff_rvlc_rl_inter;
125 extern RLTable ff_rvlc_rl_intra;
127 extern const uint16_t ff_sprite_trajectory_tab[15][2];
128 extern const uint8_t ff_mb_type_b_tab[4][2];
130 /* these matrixes will be permuted for the idct */
131 extern const int16_t ff_mpeg4_default_intra_matrix[64];
132 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
134 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
135 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
136 extern const uint16_t ff_mpeg4_resync_prefix[8];
138 extern const uint8_t ff_mpeg4_dc_threshold[8];
140 void ff_mpeg4_encode_mb(MpegEncContext *s,
141 int16_t block[6][64],
142 int motion_x, int motion_y);
143 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
145 void ff_set_mpeg4_time(MpegEncContext *s);
146 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
148 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
149 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
150 void ff_mpeg4_clean_buffers(MpegEncContext *s);
151 void ff_mpeg4_stuffing(PutBitContext *pbc);
152 void ff_mpeg4_init_partitions(MpegEncContext *s);
153 void ff_mpeg4_merge_partitions(MpegEncContext *s);
154 void ff_clean_mpeg4_qscales(MpegEncContext *s);
155 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
156 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
157 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
158 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
159 void ff_mpeg4videodec_static_init(void);
160 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
161 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
164 * @return the mb_type
166 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
168 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
170 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
171 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
178 * encoding quantized level -> quantized diff
179 * decoding quantized diff -> quantized level
180 * @param n block index (0-3 are luma, 4-5 are chroma)
181 * @param dir_ptr pointer to an integer where the prediction direction will be stored
183 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
184 int *dir_ptr, int encoding)
186 int a, b, c, wrap, pred, scale, ret;
189 /* find prediction */
191 scale = s->y_dc_scale;
193 scale = s->c_dc_scale;
197 wrap = s->block_wrap[n];
198 dc_val = s->dc_val[0] + s->block_index[n];
204 b = dc_val[-1 - wrap];
207 /* outside slice handling (we can't do that by memset as we need the
208 * dc for error resilience) */
209 if (s->first_slice_line && n != 3) {
212 if (n != 1 && s->mb_x == s->resync_mb_x)
215 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
216 if (n == 0 || n == 4 || n == 5)
220 if (abs(a - b) < abs(b - c)) {
222 *dir_ptr = 1; /* top */
225 *dir_ptr = 0; /* left */
227 /* we assume pred is positive */
228 pred = FASTDIV((pred + (scale >> 1)), scale);
237 if (level & (~2047)) {
238 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
240 av_log(s->avctx, AV_LOG_ERROR,
241 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
244 if (level > 2048 + scale) {
245 av_log(s->avctx, AV_LOG_ERROR,
246 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
252 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
260 #endif /* AVCODEC_MPEG4VIDEO_H */