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
64 #define SLICE_STARTCODE 0x1B7
65 #define EXT_STARTCODE 0x1B8
67 #define QUANT_MATRIX_EXT_ID 0x3
69 /* smaller packets likely don't contain a real frame */
70 #define MAX_NVOP_SIZE 19
72 typedef struct Mpeg4DecContext {
75 /// number of bits to represent the fractional part of time
76 int time_increment_bits;
79 int sprite_brightness_change;
80 int num_sprite_warping_points;
81 /// sprite trajectory points
82 uint16_t sprite_traj[4][2];
83 /// sprite shift [isChroma]
88 /// could this stream contain resync markers
90 /// time distance of first I -> B, used for interlaced B-frames
98 /// QP above which the ac VLC should be used for intra dc
99 int intra_dc_threshold;
101 /* bug workarounds */
107 /// flag for having shown the warning about invalid Divx B-frames
108 int showed_packed_warning;
109 /** does the stream contain the low_delay flag,
110 * used to work around buggy encoders. */
111 int vol_control_parameters;
112 int cplx_estimation_trash_i;
113 int cplx_estimation_trash_p;
114 int cplx_estimation_trash_b;
116 VLC studio_intra_tab[12];
118 VLC studio_chroma_dc;
123 static const uint8_t mpeg4_block_count[4] = {0, 6, 8, 12};
125 /* dc encoding for MPEG-4 */
126 extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
127 extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
129 extern const uint16_t ff_mpeg4_intra_vlc[103][2];
130 extern const int8_t ff_mpeg4_intra_level[102];
131 extern const int8_t ff_mpeg4_intra_run[102];
133 extern RLTable ff_mpeg4_rl_intra;
135 /* Note this is identical to the intra rvlc except that it is reordered. */
136 extern RLTable ff_rvlc_rl_inter;
137 extern RLTable ff_rvlc_rl_intra;
139 extern const uint16_t ff_sprite_trajectory_tab[15][2];
140 extern const uint8_t ff_mb_type_b_tab[4][2];
142 /* these matrixes will be permuted for the idct */
143 extern const int16_t ff_mpeg4_default_intra_matrix[64];
144 extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
146 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
147 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
148 extern const uint16_t ff_mpeg4_resync_prefix[8];
150 extern const uint8_t ff_mpeg4_dc_threshold[8];
152 extern const uint16_t ff_mpeg4_studio_dc_luma[19][2];
153 extern const uint16_t ff_mpeg4_studio_dc_chroma[19][2];
154 extern const uint16_t ff_mpeg4_studio_intra[12][22][2];
156 void ff_mpeg4_encode_mb(MpegEncContext *s,
157 int16_t block[6][64],
158 int motion_x, int motion_y);
159 void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
161 void ff_set_mpeg4_time(MpegEncContext *s);
162 int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
164 int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb);
165 void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
166 void ff_mpeg4_clean_buffers(MpegEncContext *s);
167 void ff_mpeg4_stuffing(PutBitContext *pbc);
168 void ff_mpeg4_init_partitions(MpegEncContext *s);
169 void ff_mpeg4_merge_partitions(MpegEncContext *s);
170 void ff_clean_mpeg4_qscales(MpegEncContext *s);
171 int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
172 int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
173 int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
174 int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
175 void ff_mpeg4_init_direct_mv(MpegEncContext *s);
176 void ff_mpeg4videodec_static_init(void);
177 int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
178 int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
181 * @return the mb_type
183 int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
185 extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3];
187 #if 0 //3IV1 is quite rare and it slows things down a tiny bit
188 #define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
195 * encoding quantized level -> quantized diff
196 * decoding quantized diff -> quantized level
197 * @param n block index (0-3 are luma, 4-5 are chroma)
198 * @param dir_ptr pointer to an integer where the prediction direction will be stored
200 static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
201 int *dir_ptr, int encoding)
203 int a, b, c, wrap, pred, scale, ret;
206 /* find prediction */
208 scale = s->y_dc_scale;
210 scale = s->c_dc_scale;
214 wrap = s->block_wrap[n];
215 dc_val = s->dc_val[0] + s->block_index[n];
221 b = dc_val[-1 - wrap];
224 /* outside slice handling (we can't do that by memset as we need the
225 * dc for error resilience) */
226 if (s->first_slice_line && n != 3) {
229 if (n != 1 && s->mb_x == s->resync_mb_x)
232 if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
233 if (n == 0 || n == 4 || n == 5)
237 if (abs(a - b) < abs(b - c)) {
239 *dir_ptr = 1; /* top */
242 *dir_ptr = 0; /* left */
244 /* we assume pred is positive */
245 pred = FASTDIV((pred + (scale >> 1)), scale);
254 if (level & (~2047)) {
255 if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
257 av_log(s->avctx, AV_LOG_ERROR,
258 "dc<0 at %dx%d\n", s->mb_x, s->mb_y);
259 return AVERROR_INVALIDDATA;
261 if (level > 2048 + scale) {
262 av_log(s->avctx, AV_LOG_ERROR,
263 "dc overflow at %dx%d\n", s->mb_x, s->mb_y);
264 return AVERROR_INVALIDDATA;
269 else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
277 #endif /* AVCODEC_MPEG4VIDEO_H */