dilim/FFmpeg
1
0 Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2026-11-06 13:28:17 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
7aab64c1f2187a3d4607b699eb18810bbd806387
FFmpeg/libavcodec/cavs.h
T
Rainbaby c37ebc8d98 avcodec/cavsdec: accept the AVS1-P16 Broadcasting profile 
Until now decode_seq_header() refused profile_id 0x48, so nothing the
preceding commits added was reachable. The annex A de-emulation and the
field decoding among them deliberately apply to JiZhun as well.

A Broadcasting sequence that is not 8 bit 4:2:0 is refused rather than
decoded with the wrong macroblock layer.

The SD AVS+ mux attached to trac ticket 6948 decodes with this: both
video streams, frame coded AEC pictures throughout.

Fixes: https://trac.ffmpeg.org/ticket/6948
Signed-off-by: Rainbaby <r@bgr.jp>
2026-11-02 22:18:06 +00:00

365 lines
11 KiB
C
Raw Blame History

/*
* Chinese AVS video (AVS1-P2/P16, JiZhun and Broadcasting profiles) decoder.
* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
*
* 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_CAVS_H
#define AVCODEC_CAVS_H
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/frame.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "cavs_aec.h"
#include "cavsdsp.h"
#include "blockdsp.h"
#include "h264chroma.h"
#include "get_bits.h"
#include "videodsp.h"
#define SLICE_MAX_START_CODE 0x000001af
#define EXT_START_CODE 0x000001b5
#define USER_START_CODE 0x000001b2
#define CAVS_START_CODE 0x000001b0
#define PIC_I_START_CODE 0x000001b3
#define PIC_PB_START_CODE 0x000001b6
#define A_AVAIL 1
#define B_AVAIL 2
#define C_AVAIL 4
#define D_AVAIL 8
#define NOT_AVAIL -1
#define REF_INTRA -2
#define REF_DIR -3
#define ESCAPE_CODE 59
#define FWD0 0x01
#define FWD1 0x02
#define BWD0 0x04
#define BWD1 0x08
#define SYM0 0x10
#define SYM1 0x20
#define SPLITH 0x40
#define SPLITV 0x80
#define MV_BWD_OFFS 12
#define MV_STRIDE 4
enum cavs_mb {
I_8X8 = 0,
P_SKIP,
P_16X16,
P_16X8,
P_8X16,
P_8X8,
B_SKIP,
B_DIRECT,
B_FWD_16X16,
B_BWD_16X16,
B_SYM_16X16,
B_8X8 = 29
};
enum cavs_sub_mb {
B_SUB_DIRECT,
B_SUB_FWD,
B_SUB_BWD,
B_SUB_SYM
};
enum cavs_intra_luma {
INTRA_L_VERT,
INTRA_L_HORIZ,
INTRA_L_LP,
INTRA_L_DOWN_LEFT,
INTRA_L_DOWN_RIGHT,
INTRA_L_LP_LEFT,
INTRA_L_LP_TOP,
INTRA_L_DC_128
};
enum cavs_intra_chroma {
INTRA_C_LP,
INTRA_C_HORIZ,
INTRA_C_VERT,
INTRA_C_PLANE,
INTRA_C_LP_LEFT,
INTRA_C_LP_TOP,
INTRA_C_DC_128,
};
enum cavs_mv_pred {
MV_PRED_MEDIAN,
MV_PRED_LEFT,
MV_PRED_TOP,
MV_PRED_TOPRIGHT,
MV_PRED_PSKIP,
MV_PRED_BSKIP
};
enum cavs_block {
BLK_16X16,
BLK_16X8,
BLK_8X16,
BLK_8X8
};
enum cavs_mv_loc {
MV_FWD_D3 = 0,
MV_FWD_B2,
MV_FWD_B3,
MV_FWD_C2,
MV_FWD_A1,
MV_FWD_X0,
MV_FWD_X1,
MV_FWD_A3 = 8,
MV_FWD_X2,
MV_FWD_X3,
MV_BWD_D3 = MV_BWD_OFFS,
MV_BWD_B2,
MV_BWD_B3,
MV_BWD_C2,
MV_BWD_A1,
MV_BWD_X0,
MV_BWD_X1,
MV_BWD_A3 = MV_BWD_OFFS+8,
MV_BWD_X2,
MV_BWD_X3
};
typedef struct cavs_vector {
int16_t x;
int16_t y;
int16_t dist;
int16_t ref;
/**
* mb_reference_index of the block, 0 when it codes none (clause 9.4.5);
* ref above is where the reference list puts it
*/
int16_t ref_idx;
} cavs_vector;
struct dec_2dvlc {
int8_t rltab[59][3];
int8_t level_add[27];
int8_t golomb_order;
int inc_limit;
int8_t max_run;
};
typedef struct AVSFrame {
AVFrame *f;
int poc;
} AVSFrame;
typedef struct AVSContext {
AVCodecContext *avctx;
BlockDSPContext bdsp;
H264ChromaContext h264chroma;
VideoDSPContext vdsp;
CAVSDSPContext cdsp;
GetBitContext gb;
AVSFrame cur; ///< currently decoded frame
AVSFrame DPB[2]; ///< reference frames
/**
* The reference of every reference index, clause 9.4.5: a frame, or the
* field of one starting at parity; both lists share the array.
*/
struct {
AVFrame *f; ///< frame the reference belongs to
int parity; ///< first line of the reference field inside it
} ref[4];
int ref_base[2]; ///< first entry of the forward and the backward list
int dist[4]; ///< BlockDistance of every reference, clause 9.4.6.1
int low_delay;
int progressive_seq;
int profile, level;
int aspect_ratio;
int mb_width, mb_height;
int width, height;
int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder
int progressive;
int pic_structure;
int top_field_first; ///< first coded field is the top one, clause 7.2.3
int b_field_enhanced; ///< BFieldEnhanced of the picture, clause 9.9.1 b)
int field; ///< field of the current MB, 0 or 1, clause 3.24
int field_mby; ///< macroblock row of the current macroblock in it
int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
int aec_enable; ///< the macroblock layer uses AEC (AVS1-P16)
int aec_start; ///< byte offset of the current AEC slice's payload
CAVSAECContext aec; ///< AEC decoder state and contexts, clause 8.4
int prev_delta_qp; ///< PreviousDeltaQP of clause 9.4.8, an AEC context
int left_cbp; ///< MbCBP of the macroblock to the left
uint8_t *top_cbp; ///< MbCBP of the macroblock above, one per column
int left_mb_type; ///< MbType to the left, clause 8.4.4.2 b)
uint8_t *top_mb_type; ///< MbType above, one per column
int left_c_pred_mode; ///< IntraChromaPredMode to the left, 8.4.4.2 e)
uint8_t *top_c_pred_mode; ///< IntraChromaPredMode above, per column
int loop_filter_disable;
int alpha_offset, beta_offset;
int ref_flag;
int mbx, mby, mbidx; ///< macroblock coordinates
int flags; ///< availability flags of neighbouring macroblocks
int stc; ///< last start code
int pic_data_end; ///< a unit that is not a slice ended the picture's data
uint8_t *cy, *cu, *cv; ///< current MB sample pointers
int left_qp;
uint8_t *top_qp;
/** mv motion vector cache
0: D3 B2 B3 C2
4: A1 X0 X1 -
8: A3 X2 X3 -
X are the vectors in the current macroblock (5,6,9,10)
A is the macroblock to the left (4,8)
B is the macroblock to the top (1,2)
C is the macroblock to the top-right (3)
D is the macroblock to the top-left (0)
the same is repeated for backward motion vectors */
DECLARE_ALIGNED(8, cavs_vector, mv)[2*4*3];
/** mv_diff of the same blocks, for the ctxIdxInc of clause 8.4.4.2 g) */
int16_t mvd[2*4*3][2];
cavs_vector *top_mv[2];
cavs_vector *col_mv;
/** luma pred mode cache
0: -- B2 B3
3: A1 X0 X1
6: A3 X2 X3 */
int pred_mode_Y[3*3];
int *top_pred_Y;
ptrdiff_t l_stride, c_stride;
int luma_scan[4];
int qp;
int qp_fixed;
int pic_qp_fixed;
int cbp;
DECLARE_ALIGNED(32, int16_t, block)[64];
uint8_t permutated_scantable[64];
/** inverse block scan method 2 of clause 9.5.3 c), for field pictures */
uint8_t permutated_scantable_field[64];
/** the one of the two the current picture uses, selected in decode_pic() */
const uint8_t *scantable;
/** intra prediction is done with un-deblocked samples
they are saved here before deblocking the MB */
uint8_t *top_border_y, *top_border_u, *top_border_v;
uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
uint8_t intern_border_y[26];
uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
void (*intra_pred_l[8])(uint8_t *d, uint8_t *top, uint8_t *left, ptrdiff_t stride);
void (*intra_pred_c[7])(uint8_t *d, uint8_t *top, uint8_t *left, ptrdiff_t stride);
uint8_t *col_type_base;
/** 512 / dist[], for scaling neighbouring MVs (clause 9.4.6.2 step 3) */
int scale_den[4];
/**
* 16384 / BlockDistanceRef of clause 9.9.1 b) 3), indexed by the
* co-located block's own distance, which is 9 bits (clause 9.4.6.1)
*/
uint16_t direct_den[512];
uint8_t *edge_emu_buffer;
/**
* picture payload with the annex A pseudo start codes removed,
* allocated only for the pictures that carry one
*/
uint8_t *deemulated_buf;
unsigned int deemulated_buf_size;
/**
* byte offsets in deemulated_buf at which a start code prefix of the
* original payload begins
*/
uint32_t *stc_offset;
unsigned int stc_offset_size;
int nb_stc_offset;
int got_keyframe;
} AVSContext;
extern const uint8_t ff_cavs_chroma_qp[64];
extern const uint8_t ff_cavs_partition_flags[30];
/** mark block as using intra prediction */
#define CAVS_DIR_MV (cavs_vector){ 0, 0, 1, REF_DIR, 0 }
/** mark block as "no prediction from this direction"
e.g. forward motion vector in BWD partition */
#define CAVS_INTRA_MV (cavs_vector){ 0, 0, 1, REF_INTRA, 0 }
static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {
switch(size) {
case BLK_16X16:
mv[MV_STRIDE ] = mv[0];
mv[MV_STRIDE+1] = mv[0];
av_fallthrough;
case BLK_16X8:
mv[1] = mv[0];
break;
case BLK_8X16:
mv[MV_STRIDE] = mv[0];
break;
}
}
/** replicate one partition's mv_diff over the 8x8 blocks it covers */
static inline void set_mvds(int16_t (*mvd)[2], enum cavs_block size)
{
switch (size) {
case BLK_16X16:
memcpy(mvd[MV_STRIDE ], mvd[0], sizeof(*mvd));
memcpy(mvd[MV_STRIDE+1], mvd[0], sizeof(*mvd));
av_fallthrough;
case BLK_16X8:
memcpy(mvd[1], mvd[0], sizeof(*mvd));
break;
case BLK_8X16:
memcpy(mvd[MV_STRIDE], mvd[0], sizeof(*mvd));
break;
}
}
void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);
void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,
int block);
void ff_cavs_load_intra_pred_chroma(AVSContext *h);
void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);
void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);
void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
enum cavs_mv_pred mode, enum cavs_block size, int ref);
void ff_cavs_init_mb(AVSContext *h);
void ff_cavs_set_mb_row(AVSContext *h);
int ff_cavs_next_mb(AVSContext *h);
int ff_cavs_init_pic(AVSContext *h);
int ff_cavs_init_top_lines(AVSContext *h);
int ff_cavs_init(AVCodecContext *avctx);
int ff_cavs_end (AVCodecContext *avctx);
#endif /* AVCODEC_CAVS_H */
Reference in new issue View Git Blame Copy Permalink