mirror of https://git.ffmpeg.org/ffmpeg.git
256 lines
7.5 KiB
C
256 lines
7.5 KiB
C
/*
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* MPEG4 encoder/decoder internal header.
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* Copyright (c) 2000,2001 Fabrice Bellard
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* Copyright (c) 2002-2010 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_MPEG4VIDEO_H
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#define AVCODEC_MPEG4VIDEO_H
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#include <stdint.h>
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#include "get_bits.h"
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#include "mpegvideo.h"
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#include "rl.h"
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// shapes
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#define RECT_SHAPE 0
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#define BIN_SHAPE 1
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#define BIN_ONLY_SHAPE 2
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#define GRAY_SHAPE 3
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#define SIMPLE_VO_TYPE 1
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#define CORE_VO_TYPE 3
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#define MAIN_VO_TYPE 4
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#define NBIT_VO_TYPE 5
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#define ARTS_VO_TYPE 10
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#define ACE_VO_TYPE 12
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#define ADV_SIMPLE_VO_TYPE 17
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// aspect_ratio_info
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#define EXTENDED_PAR 15
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//vol_sprite_usage / sprite_enable
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#define STATIC_SPRITE 1
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#define GMC_SPRITE 2
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#define MOTION_MARKER 0x1F001
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#define DC_MARKER 0x6B001
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#define VOS_STARTCODE 0x1B0
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#define USER_DATA_STARTCODE 0x1B2
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#define GOP_STARTCODE 0x1B3
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#define VISUAL_OBJ_STARTCODE 0x1B5
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#define VOP_STARTCODE 0x1B6
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typedef struct Mpeg4DecContext {
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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
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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 */
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int divx_version;
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int divx_build;
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int xvid_build;
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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 vol_control_parameters; /**< does the stream contain the low_delay flag,
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* used to work around buggy encoders. */
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int cplx_estimation_trash_i;
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int cplx_estimation_trash_p;
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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];
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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];
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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;
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extern RLTable ff_rvlc_rl_intra;
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extern const uint16_t ff_sprite_trajectory_tab[15][2];
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extern const uint8_t ff_mb_type_b_tab[4][2];
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/* these matrixes will be permuted for the idct */
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extern const int16_t ff_mpeg4_default_intra_matrix[64];
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extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
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extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
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extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
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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);
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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);
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void ff_mpeg4_merge_partitions(MpegEncContext *s);
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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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/**
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*
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* @return the mb_type
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*/
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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
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#define IS_3IV1 s->codec_tag == AV_RL32("3IV1")
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#else
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#define IS_3IV1 0
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#endif
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/**
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* Predict the dc.
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* encoding quantized level -> quantized diff
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* decoding quantized diff -> quantized level
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* @param n block index (0-3 are luma, 4-5 are chroma)
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* @param dir_ptr pointer to an integer where the prediction direction will be stored
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*/
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static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
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int *dir_ptr, int encoding)
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{
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int a, b, c, wrap, pred, scale, ret;
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int16_t *dc_val;
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/* 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)
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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];
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/* B C
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* A X
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*/
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a = dc_val[-1];
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b = dc_val[-1 - wrap];
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c = dc_val[-wrap];
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/* outside slice handling (we can't do that by memset as we need the
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* dc for error resilience) */
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if (s->first_slice_line && n != 3) {
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if (n != 2)
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b = c = 1024;
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if (n != 1 && s->mb_x == s->resync_mb_x)
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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) {
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if (n == 0 || n == 4 || n == 5)
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b = 1024;
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}
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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 */
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} else {
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pred = a;
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*dir_ptr = 0; /* left */
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}
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/* we assume pred is positive */
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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) {
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av_log(s->avctx, AV_LOG_ERROR,
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"dc<0 at %dx%d\n", s->mb_x, s->mb_y);
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return -1;
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}
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if (level * scale > 2048 + scale) {
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av_log(s->avctx, AV_LOG_ERROR,
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"dc overflow at %dx%d\n", s->mb_x, s->mb_y);
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return -1;
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}
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}
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}
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level *= scale;
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if (level & (~2047)) {
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if (level < 0)
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level = 0;
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else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
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level = 2047;
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}
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dc_val[0] = level;
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return ret;
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}
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#endif /* AVCODEC_MPEG4VIDEO_H */
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