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FFmpeg/libavcodec/mpeg4video.h
Andreas Rheinhardt d99707b42a avcodec/mpeg4video: Make initializing RLTable thread-safe 
Up until now the RLTable ff_mpeg4_rl_intra was initialized by both mpeg4
decoder and encoder (except the VLCs that are only used by the decoder).
This is an obstacle to making these codecs init-threadsafe, so move
initializing this to a single function that is guarded by a dedicated
AVOnce.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2021-04-27 00:40:18 +02:00

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/*
* MPEG-4 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
#include <stdint.h>
#include "get_bits.h"
#include "mpegvideo.h"
#include "rl.h"
// shapes
#define RECT_SHAPE 0
#define BIN_SHAPE 1
#define BIN_ONLY_SHAPE 2
#define GRAY_SHAPE 3
#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 SIMPLE_STUDIO_VO_TYPE 14
#define CORE_STUDIO_VO_TYPE 15
#define ADV_SIMPLE_VO_TYPE 17
#define VOT_VIDEO_ID 1
#define VOT_STILL_TEXTURE_ID 2
// 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
#define SLICE_STARTCODE 0x1B7
#define EXT_STARTCODE 0x1B8
#define QUANT_MATRIX_EXT_ID 0x3
/* smaller packets likely don't contain a real frame */
#define MAX_NVOP_SIZE 19
typedef struct Mpeg4DecContext {
MpegEncContext m;
/// number of bits to represent the fractional part of time
int time_increment_bits;
int shape;
int vol_sprite_usage;
int sprite_brightness_change;
int num_sprite_warping_points;
/// sprite trajectory points
uint16_t sprite_traj[4][2];
/// sprite shift [isChroma]
int sprite_shift[2];
// reversible vlc
int rvlc;
/// could this stream contain resync markers
int resync_marker;
/// time distance of first I -> B, used for interlaced B-frames
int t_frame;
int new_pred;
int enhancement_type;
int scalability;
int use_intra_dc_vlc;
/// QP above which the ac VLC should be used for intra dc
int intra_dc_threshold;
/* bug workarounds */
int divx_version;
int divx_build;
int xvid_build;
int lavc_build;
/// flag for having shown the warning about invalid Divx B-frames
int showed_packed_warning;
/** does the stream contain the low_delay flag,
* used to work around buggy encoders. */
int vol_control_parameters;
int cplx_estimation_trash_i;
int cplx_estimation_trash_p;
int cplx_estimation_trash_b;
int rgb;
} Mpeg4DecContext;
static const uint8_t mpeg4_block_count[4] = {0, 6, 8, 12};
/* dc encoding for MPEG-4 */
extern const uint8_t ff_mpeg4_DCtab_lum[13][2];
extern const uint8_t ff_mpeg4_DCtab_chrom[13][2];
extern const uint16_t ff_mpeg4_intra_vlc[103][2];
extern const int8_t ff_mpeg4_intra_level[102];
extern const int8_t ff_mpeg4_intra_run[102];
extern RLTable ff_mpeg4_rl_intra;
void ff_mpeg4_init_rl_intra(void);
/* Note this is identical to the intra rvlc except that it is reordered. */
extern RLTable ff_rvlc_rl_inter;
extern RLTable ff_rvlc_rl_intra;
extern const uint8_t ff_sprite_trajectory_lens[15];
extern const uint8_t ff_mb_type_b_tab[4][2];
/* 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];
extern const uint8_t ff_mpeg4_dc_threshold[8];
extern const uint8_t ff_mpeg4_studio_dc_luma[19][2];
extern const uint8_t ff_mpeg4_studio_dc_chroma[19][2];
extern const uint8_t ff_mpeg4_studio_intra[12][24][2];
void ff_mpeg4_encode_mb(MpegEncContext *s,
int16_t block[6][64],
int motion_x, int motion_y);
void ff_mpeg4_pred_ac(MpegEncContext *s, int16_t *block, int n,
int dir);
void ff_set_mpeg4_time(MpegEncContext *s);
int ff_mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
int ff_mpeg4_decode_picture_header(Mpeg4DecContext *ctx, GetBitContext *gb, int header);
void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);
void ff_mpeg4_clean_buffers(MpegEncContext *s);
void ff_mpeg4_stuffing(PutBitContext *pbc);
void ff_mpeg4_init_partitions(MpegEncContext *s);
void ff_mpeg4_merge_partitions(MpegEncContext *s);
void ff_clean_mpeg4_qscales(MpegEncContext *s);
int ff_mpeg4_decode_partitions(Mpeg4DecContext *ctx);
int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);
int ff_mpeg4_decode_video_packet_header(Mpeg4DecContext *ctx);
int ff_mpeg4_decode_studio_slice_header(Mpeg4DecContext *ctx);
void ff_mpeg4_init_direct_mv(MpegEncContext *s);
void ff_mpeg4videodec_static_init(void);
int ff_mpeg4_workaround_bugs(AVCodecContext *avctx);
int ff_mpeg4_frame_end(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
/**
* @return the mb_type
*/
int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);
#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
/**
* Predict the dc.
* 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
*/
static inline int ff_mpeg4_pred_dc(MpegEncContext *s, int n, int level,
int *dir_ptr, int encoding)
{
int a, b, c, wrap, pred, scale, ret;
int16_t *dc_val;
/* find prediction */
if (n < 4)
scale = s->y_dc_scale;
else
scale = s->c_dc_scale;
if (IS_3IV1)
scale = 8;
wrap = s->block_wrap[n];
dc_val = s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/
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;
}
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;
}
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1; /* top */
} else {
pred = a;
*dir_ptr = 0; /* left */
}
/* we assume pred is positive */
pred = FASTDIV((pred + (scale >> 1)), scale);
if (encoding) {
ret = level - pred;
} else {
level += pred;
ret = level;
}
level *= scale;
if (level & (~2047)) {
if (!s->encoding && (s->avctx->err_recognition & (AV_EF_BITSTREAM | AV_EF_AGGRESSIVE))) {
if (level < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"dc<0 at %dx%d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
if (level > 2048 + scale) {
av_log(s->avctx, AV_LOG_ERROR,
"dc overflow at %dx%d\n", s->mb_x, s->mb_y);
return AVERROR_INVALIDDATA;
}
}
if (level < 0)
level = 0;
else if (!(s->workaround_bugs & FF_BUG_DC_CLIP))
level = 2047;
}
dc_val[0] = level;
return ret;
}
#endif /* AVCODEC_MPEG4VIDEO_H */
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