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/*
* MPEG4 encoder/decoder internal header.
* Copyright (c) 2000,2001 Fabrice Bellard
* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_MPEG4VIDEO_H
#define AVCODEC_MPEG4VIDEO_H
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#include <stdint.h> |
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#include "get_bits.h"
#include "mpegvideo.h"
#include "rl.h"
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// shapes
#define RECT_SHAPE 0
#define BIN_SHAPE 1
#define BIN_ONLY_SHAPE 2
#define GRAY_SHAPE 3
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#define SIMPLE_VO_TYPE 1
#define CORE_VO_TYPE 3
#define MAIN_VO_TYPE 4
#define NBIT_VO_TYPE 5
#define ARTS_VO_TYPE 10
#define ACE_VO_TYPE 12
#define ADV_SIMPLE_VO_TYPE 17 |
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// aspect_ratio_info
#define EXTENDED_PAR 15
//vol_sprite_usage / sprite_enable
#define STATIC_SPRITE 1
#define GMC_SPRITE 2
#define MOTION_MARKER 0x1F001
#define DC_MARKER 0x6B001
#define VOS_STARTCODE 0x1B0
#define USER_DATA_STARTCODE 0x1B2
#define GOP_STARTCODE 0x1B3
#define VISUAL_OBJ_STARTCODE 0x1B5
#define VOP_STARTCODE 0x1B6
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typedef struct Mpeg4DecContext {
MpegEncContext m; |
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/// number of bits to represent the fractional part of time |
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int time_increment_bits; |
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int shape; |
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int vol_sprite_usage; |
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int sprite_brightness_change; |
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int num_sprite_warping_points; |
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/// sprite trajectory points |
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uint16_t sprite_traj[4][2]; |
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/// sprite shift [isChroma] |
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int sprite_shift[2]; |
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// reversible vlc
int rvlc; |
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/// could this stream contain resync markers |
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int resync_marker; |
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/// time distance of first I -> B, used for interlaced b frames |
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int t_frame; |
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int new_pred; |
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int enhancement_type; |
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int scalability; |
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int use_intra_dc_vlc; |
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/// QP above whch the ac VLC should be used for intra dc |
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int intra_dc_threshold; |
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/* bug workarounds */
int divx_version;
int divx_build;
int xvid_build;
int lavc_build; |
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/// flag for having shown the warning about divxs invalid b frames |
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int showed_packed_warning; |
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int cplx_estimation_trash_i;
int cplx_estimation_trash_p;
int cplx_estimation_trash_b; |
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} Mpeg4DecContext;
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/* dc encoding for mpeg4 */ |
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extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
extern const uint8_t ff_mpeg4_DCtab_chrom[13][2]; |
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extern const uint16_t ff_mpeg4_intra_vlc[103][2]; |
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extern const int8_t ff_mpeg4_intra_level[102];
extern const int8_t ff_mpeg4_intra_run[102];
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extern RLTable ff_mpeg4_rl_intra; |
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/* Note this is identical to the intra rvlc except that it is reordered. */ |
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extern RLTable ff_rvlc_rl_inter;
extern RLTable ff_rvlc_rl_intra; |
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extern const uint16_t ff_sprite_trajectory_tab[15][2];
extern const uint8_t ff_mb_type_b_tab[4][2]; |
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/* these matrixes will be permuted for the idct */
extern const int16_t ff_mpeg4_default_intra_matrix[64];
extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
extern const uint16_t ff_mpeg4_resync_prefix[8];
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extern const uint8_t ff_mpeg4_dc_threshold[8]; |
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void ff_mpeg4_encode_mb(MpegEncContext *s, |
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int16_t block[6][64], |
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int motion_x, int motion_y); |
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void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n, |
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int dir); |
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void ff_set_mpeg4_time(MpegEncContext *s); |
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void ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number); |
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int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb); |
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void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
void ff_mpeg4_clean_buffers(MpegEncContext *s); |
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void ff_mpeg4_stuffing(PutBitContext *pbc); |
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void ff_mpeg4_init_partitions(MpegEncContext *s);
void ff_mpeg4_merge_partitions(MpegEncContext *s);
void ff_clean_mpeg4_qscales(MpegEncContext *s); |
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int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx); |
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int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s); |
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int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx); |
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void ff_mpeg4_init_direct_mv(MpegEncContext *s); |
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void ff_mpeg4videodec_static_init(void); |
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int ff_mpeg4_workaround_bugs(AVCodecContext *avctx); |
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int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size); |
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/**
*
* @return the mb_type
*/
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my); |
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extern uint8_t ff_mpeg4_static_rl_table_store[3][2][2 * MAX_RUN + MAX_LEVEL + 3]; |
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#if 0 //3IV1 is quite rare and it slows things down a tiny bit
#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
#else
#define IS_3IV1 0
#endif
/** |
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* Predict the dc. |
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* encoding quantized level -> quantized diff
* decoding quantized diff -> quantized level
* @param n block index (0-3 are luma, 4-5 are chroma)
* @param dir_ptr pointer to an integer where the prediction direction will be stored
*/ |
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static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
int *dir_ptr, int encoding) |
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{
int a, b, c, wrap, pred, scale, ret;
int16_t *dc_val;
/* find prediction */ |
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if (n < 4) |
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scale = s->y_dc_scale; |
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else |
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scale = s->c_dc_scale; |
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if (IS_3IV1)
scale = 8; |
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wrap = s->block_wrap[n]; |
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dc_val = s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/ |
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a = dc_val[-1];
b = dc_val[-1 - wrap];
c = dc_val[-wrap];
/* outside slice handling (we can't do that by memset as we need the
* dc for error resilience) */
if (s->first_slice_line && n != 3) {
if (n != 2)
b = c = 1024;
if (n != 1 && s->mb_x == s->resync_mb_x)
b = a = 1024; |
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} |
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if (s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y + 1) {
if (n == 0 || n == 4 || n == 5)
b = 1024; |
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}
if (abs(a - b) < abs(b - c)) { |
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pred = c; |
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*dir_ptr = 1; /* top */
} else { |
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pred = a; |
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*dir_ptr = 0; /* left */
}
/* we assume pred is positive */
pred = FASTDIV((pred + (scale >> 1)), scale);
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if (encoding) { |
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ret = level - pred; |
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} else { |
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level += pred; |
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ret = level; |
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if (s->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE)) { |
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if (level < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"dc<0 at %dx%d\n", s->mb_x, s->mb_y); |
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return -1;
} |
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if (level * scale > 2048 + scale) {
av_log(s->avctx, AV_LOG_ERROR,
"dc overflow at %dx%d\n", s->mb_x, s->mb_y); |
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return -1;
}
}
} |
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level *= scale;
if (level & (~2047)) {
if (level < 0)
level = 0;
else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
level = 2047; |
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} |
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dc_val[0] = level; |
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return ret;
} |
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#endif /* AVCODEC_MPEG4VIDEO_H */ |