Merge commit '9df889a5f116c1ee78c2f239e0ba599c492431aa'

* commit '9df889a5f116c1ee78c2f239e0ba599c492431aa':
  h264: rename h264.[ch] to h264dec.[ch]

Merged-by: Clément Bœsch <u@pkh.me>

1 files changed, 1008 insertions, 0 deletions

diff --git a/libavcodec/h264dec.h b/libavcodec/h264dec.h
new file mode 100644
index 0000000000..009a86104a
--- /dev/null
+++ b/libavcodec/h264dec.h
@@ -0,0 +1,1008 @@
+/*
+ * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
+ * Copyright (c) 2003 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
+ */
+
+/**
+ * @file
+ * H.264 / AVC / MPEG-4 part10 codec.
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#ifndef AVCODEC_H264DEC_H
+#define AVCODEC_H264DEC_H
+
+#include "libavutil/buffer.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/thread.h"
+
+#include "cabac.h"
+#include "error_resilience.h"
+#include "h264_parse.h"
+#include "h264_sei.h"
+#include "h2645_parse.h"
+#include "h264chroma.h"
+#include "h264dsp.h"
+#include "h264pred.h"
+#include "h264qpel.h"
+#include "internal.h"
+#include "mpegutils.h"
+#include "parser.h"
+#include "qpeldsp.h"
+#include "rectangle.h"
+#include "videodsp.h"
+
+#define H264_MAX_PICTURE_COUNT 36
+
+#define MAX_SPS_COUNT          32
+#define MAX_PPS_COUNT         256
+
+#define MAX_MMCO_COUNT         66
+
+#define MAX_DELAYED_PIC_COUNT  16
+
+#define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
+
+/* Compiling in interlaced support reduces the speed
+ * of progressive decoding by about 2%. */
+#define ALLOW_INTERLACE
+
+#define FMO 0
+
+/**
+ * The maximum number of slices supported by the decoder.
+ * must be a power of 2
+ */
+#define MAX_SLICES 32
+
+#ifdef ALLOW_INTERLACE
+#define MB_MBAFF(h)    (h)->mb_mbaff
+#define MB_FIELD(sl)  (sl)->mb_field_decoding_flag
+#define FRAME_MBAFF(h) (h)->mb_aff_frame
+#define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
+#define LEFT_MBS 2
+#define LTOP     0
+#define LBOT     1
+#define LEFT(i)  (i)
+#else
+#define MB_MBAFF(h)      0
+#define MB_FIELD(sl)     0
+#define FRAME_MBAFF(h)   0
+#define FIELD_PICTURE(h) 0
+#undef  IS_INTERLACED
+#define IS_INTERLACED(mb_type) 0
+#define LEFT_MBS 1
+#define LTOP     0
+#define LBOT     0
+#define LEFT(i)  0
+#endif
+#define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
+
+#ifndef CABAC
+#define CABAC(h) (h)->ps.pps->cabac
+#endif
+
+#define CHROMA(h)    ((h)->ps.sps->chroma_format_idc)
+#define CHROMA422(h) ((h)->ps.sps->chroma_format_idc == 2)
+#define CHROMA444(h) ((h)->ps.sps->chroma_format_idc == 3)
+
+#define EXTENDED_SAR       255
+
+#define MB_TYPE_REF0       MB_TYPE_ACPRED // dirty but it fits in 16 bit
+#define MB_TYPE_8x8DCT     0x01000000
+#define IS_REF0(a)         ((a) & MB_TYPE_REF0)
+#define IS_8x8DCT(a)       ((a) & MB_TYPE_8x8DCT)
+
+#define QP_MAX_NUM (51 + 6*6)           // The maximum supported qp
+
+/* NAL unit types */
+enum {
+    NAL_SLICE           = 1,
+    NAL_DPA             = 2,
+    NAL_DPB             = 3,
+    NAL_DPC             = 4,
+    NAL_IDR_SLICE       = 5,
+    NAL_SEI             = 6,
+    NAL_SPS             = 7,
+    NAL_PPS             = 8,
+    NAL_AUD             = 9,
+    NAL_END_SEQUENCE    = 10,
+    NAL_END_STREAM      = 11,
+    NAL_FILLER_DATA     = 12,
+    NAL_SPS_EXT         = 13,
+    NAL_AUXILIARY_SLICE = 19,
+};
+
+/**
+ * Sequence parameter set
+ */
+typedef struct SPS {
+    unsigned int sps_id;
+    int profile_idc;
+    int level_idc;
+    int chroma_format_idc;
+    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
+    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
+    int poc_type;                      ///< pic_order_cnt_type
+    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
+    int delta_pic_order_always_zero_flag;
+    int offset_for_non_ref_pic;
+    int offset_for_top_to_bottom_field;
+    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
+    int ref_frame_count;               ///< num_ref_frames
+    int gaps_in_frame_num_allowed_flag;
+    int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
+    int mb_height;                     ///< pic_height_in_map_units_minus1 + 1
+    int frame_mbs_only_flag;
+    int mb_aff;                        ///< mb_adaptive_frame_field_flag
+    int direct_8x8_inference_flag;
+    int crop;                          ///< frame_cropping_flag
+
+    /* those 4 are already in luma samples */
+    unsigned int crop_left;            ///< frame_cropping_rect_left_offset
+    unsigned int crop_right;           ///< frame_cropping_rect_right_offset
+    unsigned int crop_top;             ///< frame_cropping_rect_top_offset
+    unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset
+    int vui_parameters_present_flag;
+    AVRational sar;
+    int video_signal_type_present_flag;
+    int full_range;
+    int colour_description_present_flag;
+    enum AVColorPrimaries color_primaries;
+    enum AVColorTransferCharacteristic color_trc;
+    enum AVColorSpace colorspace;
+    int timing_info_present_flag;
+    uint32_t num_units_in_tick;
+    uint32_t time_scale;
+    int fixed_frame_rate_flag;
+    short offset_for_ref_frame[256]; // FIXME dyn aloc?
+    int bitstream_restriction_flag;
+    int num_reorder_frames;
+    int scaling_matrix_present;
+    uint8_t scaling_matrix4[6][16];
+    uint8_t scaling_matrix8[6][64];
+    int nal_hrd_parameters_present_flag;
+    int vcl_hrd_parameters_present_flag;
+    int pic_struct_present_flag;
+    int time_offset_length;
+    int cpb_cnt;                          ///< See H.264 E.1.2
+    int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1
+    int cpb_removal_delay_length;         ///< cpb_removal_delay_length_minus1 + 1
+    int dpb_output_delay_length;          ///< dpb_output_delay_length_minus1 + 1
+    int bit_depth_luma;                   ///< bit_depth_luma_minus8 + 8
+    int bit_depth_chroma;                 ///< bit_depth_chroma_minus8 + 8
+    int residual_color_transform_flag;    ///< residual_colour_transform_flag
+    int constraint_set_flags;             ///< constraint_set[0-3]_flag
+    uint8_t data[4096];
+    size_t data_size;
+} SPS;
+
+/**
+ * Picture parameter set
+ */
+typedef struct PPS {
+    unsigned int sps_id;
+    int cabac;                  ///< entropy_coding_mode_flag
+    int pic_order_present;      ///< pic_order_present_flag
+    int slice_group_count;      ///< num_slice_groups_minus1 + 1
+    int mb_slice_group_map_type;
+    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
+    int weighted_pred;          ///< weighted_pred_flag
+    int weighted_bipred_idc;
+    int init_qp;                ///< pic_init_qp_minus26 + 26
+    int init_qs;                ///< pic_init_qs_minus26 + 26
+    int chroma_qp_index_offset[2];
+    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
+    int constrained_intra_pred;     ///< constrained_intra_pred_flag
+    int redundant_pic_cnt_present;  ///< redundant_pic_cnt_present_flag
+    int transform_8x8_mode;         ///< transform_8x8_mode_flag
+    uint8_t scaling_matrix4[6][16];
+    uint8_t scaling_matrix8[6][64];
+    uint8_t chroma_qp_table[2][QP_MAX_NUM+1];  ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
+    int chroma_qp_diff;
+    uint8_t data[4096];
+    size_t data_size;
+
+    uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16];
+    uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];
+    uint32_t(*dequant4_coeff[6])[16];
+    uint32_t(*dequant8_coeff[6])[64];
+} PPS;
+
+typedef struct H264ParamSets {
+    AVBufferRef *sps_list[MAX_SPS_COUNT];
+    AVBufferRef *pps_list[MAX_PPS_COUNT];
+
+    AVBufferRef *pps_ref;
+    AVBufferRef *sps_ref;
+    /* currently active parameters sets */
+    const PPS *pps;
+    const SPS *sps;
+} H264ParamSets;
+
+/**
+ * Memory management control operation opcode.
+ */
+typedef enum MMCOOpcode {
+    MMCO_END = 0,
+    MMCO_SHORT2UNUSED,
+    MMCO_LONG2UNUSED,
+    MMCO_SHORT2LONG,
+    MMCO_SET_MAX_LONG,
+    MMCO_RESET,
+    MMCO_LONG,
+} MMCOOpcode;
+
+/**
+ * Memory management control operation.
+ */
+typedef struct MMCO {
+    MMCOOpcode opcode;
+    int short_pic_num;  ///< pic_num without wrapping (pic_num & max_pic_num)
+    int long_arg;       ///< index, pic_num, or num long refs depending on opcode
+} MMCO;
+
+typedef struct H264Picture {
+    AVFrame *f;
+    ThreadFrame tf;
+
+    AVBufferRef *qscale_table_buf;
+    int8_t *qscale_table;
+
+    AVBufferRef *motion_val_buf[2];
+    int16_t (*motion_val[2])[2];
+
+    AVBufferRef *mb_type_buf;
+    uint32_t *mb_type;
+
+    AVBufferRef *hwaccel_priv_buf;
+    void *hwaccel_picture_private; ///< hardware accelerator private data
+
+    AVBufferRef *ref_index_buf[2];
+    int8_t *ref_index[2];
+
+    int field_poc[2];       ///< top/bottom POC
+    int poc;                ///< frame POC
+    int frame_num;          ///< frame_num (raw frame_num from slice header)
+    int mmco_reset;         /**< MMCO_RESET set this 1. Reordering code must
+                                 not mix pictures before and after MMCO_RESET. */
+    int pic_id;             /**< pic_num (short -> no wrap version of pic_num,
+                                 pic_num & max_pic_num; long -> long_pic_num) */
+    int long_ref;           ///< 1->long term reference 0->short term reference
+    int ref_poc[2][2][32];  ///< POCs of the frames/fields used as reference (FIXME need per slice)
+    int ref_count[2][2];    ///< number of entries in ref_poc         (FIXME need per slice)
+    int mbaff;              ///< 1 -> MBAFF frame 0-> not MBAFF
+    int field_picture;      ///< whether or not picture was encoded in separate fields
+
+    int reference;
+    int recovered;          ///< picture at IDR or recovery point + recovery count
+    int invalid_gap;
+    int sei_recovery_frame_cnt;
+
+    int crop;
+    int crop_left;
+    int crop_top;
+} H264Picture;
+
+typedef struct H264Ref {
+    uint8_t *data[3];
+    int linesize[3];
+
+    int reference;
+    int poc;
+    int pic_id;
+
+    H264Picture *parent;
+} H264Ref;
+
+typedef struct H264SliceContext {
+    struct H264Context *h264;
+    GetBitContext gb;
+    ERContext er;
+
+    int slice_num;
+    int slice_type;
+    int slice_type_nos;         ///< S free slice type (SI/SP are remapped to I/P)
+    int slice_type_fixed;
+
+    int qscale;
+    int chroma_qp[2];   // QPc
+    int qp_thresh;      ///< QP threshold to skip loopfilter
+    int last_qscale_diff;
+
+    // deblock
+    int deblocking_filter;          ///< disable_deblocking_filter_idc with 1 <-> 0
+    int slice_alpha_c0_offset;
+    int slice_beta_offset;
+
+    H264PredWeightTable pwt;
+
+    int prev_mb_skipped;
+    int next_mb_skipped;
+
+    int chroma_pred_mode;
+    int intra16x16_pred_mode;
+
+    int8_t intra4x4_pred_mode_cache[5 * 8];
+    int8_t(*intra4x4_pred_mode);
+
+    int topleft_mb_xy;
+    int top_mb_xy;
+    int topright_mb_xy;
+    int left_mb_xy[LEFT_MBS];
+
+    int topleft_type;
+    int top_type;
+    int topright_type;
+    int left_type[LEFT_MBS];
+
+    const uint8_t *left_block;
+    int topleft_partition;
+
+    unsigned int topleft_samples_available;
+    unsigned int top_samples_available;
+    unsigned int topright_samples_available;
+    unsigned int left_samples_available;
+
+    ptrdiff_t linesize, uvlinesize;
+    ptrdiff_t mb_linesize;  ///< may be equal to s->linesize or s->linesize * 2, for mbaff
+    ptrdiff_t mb_uvlinesize;
+
+    int mb_x, mb_y;
+    int mb_xy;
+    int resync_mb_x;
+    int resync_mb_y;
+    unsigned int first_mb_addr;
+    // index of the first MB of the next slice
+    int next_slice_idx;
+    int mb_skip_run;
+    int is_complex;
+
+    int picture_structure;
+    int mb_field_decoding_flag;
+    int mb_mbaff;               ///< mb_aff_frame && mb_field_decoding_flag
+
+    int redundant_pic_count;
+
+    /**
+     * number of neighbors (top and/or left) that used 8x8 dct
+     */
+    int neighbor_transform_size;
+
+    int direct_spatial_mv_pred;
+    int col_parity;
+    int col_fieldoff;
+
+    int cbp;
+    int top_cbp;
+    int left_cbp;
+
+    int dist_scale_factor[32];
+    int dist_scale_factor_field[2][32];
+    int map_col_to_list0[2][16 + 32];
+    int map_col_to_list0_field[2][2][16 + 32];
+
+    /**
+     * num_ref_idx_l0/1_active_minus1 + 1
+     */
+    unsigned int ref_count[2];          ///< counts frames or fields, depending on current mb mode
+    unsigned int list_count;
+    H264Ref ref_list[2][48];        /**< 0..15: frame refs, 16..47: mbaff field refs.
+                                         *   Reordered version of default_ref_list
+                                         *   according to picture reordering in slice header */
+    struct {
+        uint8_t op;
+        uint32_t val;
+    } ref_modifications[2][32];
+    int nb_ref_modifications[2];
+
+    unsigned int pps_id;
+
+    const uint8_t *intra_pcm_ptr;
+    int16_t *dc_val_base;
+
+    uint8_t *bipred_scratchpad;
+    uint8_t *edge_emu_buffer;
+    uint8_t (*top_borders[2])[(16 * 3) * 2];
+    int bipred_scratchpad_allocated;
+    int edge_emu_buffer_allocated;
+    int top_borders_allocated[2];
+
+    /**
+     * non zero coeff count cache.
+     * is 64 if not available.
+     */
+    DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
+
+    /**
+     * Motion vector cache.
+     */
+    DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
+    DECLARE_ALIGNED(8,  int8_t, ref_cache)[2][5 * 8];
+    DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
+    uint8_t direct_cache[5 * 8];
+
+    DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
+
+    ///< as a DCT coefficient is int32_t in high depth, we need to reserve twice the space.
+    DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2];
+    DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
+    ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either
+    ///< check that i is not too large or ensure that there is some unused stuff after mb
+    int16_t mb_padding[256 * 2];
+
+    uint8_t (*mvd_table[2])[2];
+
+    /**
+     * Cabac
+     */
+    CABACContext cabac;
+    uint8_t cabac_state[1024];
+    int cabac_init_idc;
+
+    MMCO mmco[MAX_MMCO_COUNT];
+    int  nb_mmco;
+    int explicit_ref_marking;
+
+    int frame_num;
+    int poc_lsb;
+    int delta_poc_bottom;
+    int delta_poc[2];
+    int curr_pic_num;
+    int max_pic_num;
+} H264SliceContext;
+
+/**
+ * H264Context
+ */
+typedef struct H264Context {
+    const AVClass *class;
+    AVCodecContext *avctx;
+    VideoDSPContext vdsp;
+    H264DSPContext h264dsp;
+    H264ChromaContext h264chroma;
+    H264QpelContext h264qpel;
+
+    H264Picture DPB[H264_MAX_PICTURE_COUNT];
+    H264Picture *cur_pic_ptr;
+    H264Picture cur_pic;
+    H264Picture last_pic_for_ec;
+
+    H264SliceContext *slice_ctx;
+    int            nb_slice_ctx;
+
+    H2645Packet pkt;
+
+    int pixel_shift;    ///< 0 for 8-bit H.264, 1 for high-bit-depth H.264
+
+    /* coded dimensions -- 16 * mb w/h */
+    int width, height;
+    int chroma_x_shift, chroma_y_shift;
+
+    /**
+     * Backup frame properties: needed, because they can be different
+     * between returned frame and last decoded frame.
+     **/
+    int backup_width;
+    int backup_height;
+    enum AVPixelFormat backup_pix_fmt;
+
+    int droppable;
+    int coded_picture_number;
+
+    int context_initialized;
+    int flags;
+    int workaround_bugs;
+    /* Set when slice threading is used and at least one slice uses deblocking
+     * mode 1 (i.e. across slice boundaries). Then we disable the loop filter
+     * during normal MB decoding and execute it serially at the end.
+     */
+    int postpone_filter;
+
+    int8_t(*intra4x4_pred_mode);
+    H264PredContext hpc;
+
+    uint8_t (*non_zero_count)[48];
+
+#define LIST_NOT_USED -1 // FIXME rename?
+#define PART_NOT_AVAILABLE -2
+
+    /**
+     * block_offset[ 0..23] for frame macroblocks
+     * block_offset[24..47] for field macroblocks
+     */
+    int block_offset[2 * (16 * 3)];
+
+    uint32_t *mb2b_xy;  // FIXME are these 4 a good idea?
+    uint32_t *mb2br_xy;
+    int b_stride;       // FIXME use s->b4_stride
+
+    uint16_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1
+
+    // interlacing specific flags
+    int mb_aff_frame;
+    int picture_structure;
+    int first_field;
+
+    uint8_t *list_counts;               ///< Array of list_count per MB specifying the slice type
+
+    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
+    uint16_t *cbp_table;
+
+    /* chroma_pred_mode for i4x4 or i16x16, else 0 */
+    uint8_t *chroma_pred_mode_table;
+    uint8_t (*mvd_table[2])[2];
+    uint8_t *direct_table;
+
+    uint8_t zigzag_scan[16];
+    uint8_t zigzag_scan8x8[64];
+    uint8_t zigzag_scan8x8_cavlc[64];
+    uint8_t field_scan[16];
+    uint8_t field_scan8x8[64];
+    uint8_t field_scan8x8_cavlc[64];
+    uint8_t zigzag_scan_q0[16];
+    uint8_t zigzag_scan8x8_q0[64];
+    uint8_t zigzag_scan8x8_cavlc_q0[64];
+    uint8_t field_scan_q0[16];
+    uint8_t field_scan8x8_q0[64];
+    uint8_t field_scan8x8_cavlc_q0[64];
+
+    int mb_y;
+    int mb_height, mb_width;
+    int mb_stride;
+    int mb_num;
+
+    // =============================================================
+    // Things below are not used in the MB or more inner code
+
+    int nal_ref_idc;
+    int nal_unit_type;
+
+    /**
+     * Used to parse AVC variant of H.264
+     */
+    int is_avc;           ///< this flag is != 0 if codec is avc1
+    int nal_length_size;  ///< Number of bytes used for nal length (1, 2 or 4)
+
+    int bit_depth_luma;         ///< luma bit depth from sps to detect changes
+    int chroma_format_idc;      ///< chroma format from sps to detect changes
+
+    H264ParamSets ps;
+
+    uint16_t *slice_table_base;
+
+    H264POCContext poc;
+
+    H264Ref default_ref[2];
+    H264Picture *short_ref[32];
+    H264Picture *long_ref[32];
+    H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
+    int last_pocs[MAX_DELAYED_PIC_COUNT];
+    H264Picture *next_output_pic;
+    int next_outputed_poc;
+
+    /**
+     * memory management control operations buffer.
+     */
+    MMCO mmco[MAX_MMCO_COUNT];
+    int  nb_mmco;
+    int mmco_reset;
+    int explicit_ref_marking;
+
+    int long_ref_count;     ///< number of actual long term references
+    int short_ref_count;    ///< number of actual short term references
+
+    /**
+     * @name Members for slice based multithreading
+     * @{
+     */
+    /**
+     * current slice number, used to initialize slice_num of each thread/context
+     */
+    int current_slice;
+
+    /**
+     * Max number of threads / contexts.
+     * This is equal to AVCodecContext.thread_count unless
+     * multithreaded decoding is impossible, in which case it is
+     * reduced to 1.
+     */
+    int max_contexts;
+
+    /**
+     *  1 if the single thread fallback warning has already been
+     *  displayed, 0 otherwise.
+     */
+    int single_decode_warning;
+
+    /** @} */
+
+    /**
+     * Complement sei_pic_struct
+     * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
+     * However, soft telecined frames may have these values.
+     * This is used in an attempt to flag soft telecine progressive.
+     */
+    int prev_interlaced_frame;
+
+    /**
+     * Are the SEI recovery points looking valid.
+     */
+    int valid_recovery_point;
+
+    /**
+     * recovery_frame is the frame_num at which the next frame should
+     * be fully constructed.
+     *
+     * Set to -1 when not expecting a recovery point.
+     */
+    int recovery_frame;
+
+/**
+ * We have seen an IDR, so all the following frames in coded order are correctly
+ * decodable.
+ */
+#define FRAME_RECOVERED_IDR  (1 << 0)
+/**
+ * Sufficient number of frames have been decoded since a SEI recovery point,
+ * so all the following frames in presentation order are correct.
+ */
+#define FRAME_RECOVERED_SEI  (1 << 1)
+
+    int frame_recovered;    ///< Initial frame has been completely recovered
+
+    int has_recovery_point;
+
+    int missing_fields;
+
+    /* for frame threading, this is set to 1
+     * after finish_setup() has been called, so we cannot modify
+     * some context properties (which are supposed to stay constant between
+     * slices) anymore */
+    int setup_finished;
+
+    int cur_chroma_format_idc;
+    int cur_bit_depth_luma;
+    int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
+
+    int enable_er;
+
+    H264SEIContext sei;
+
+    AVBufferPool *qscale_table_pool;
+    AVBufferPool *mb_type_pool;
+    AVBufferPool *motion_val_pool;
+    AVBufferPool *ref_index_pool;
+    int ref2frm[MAX_SLICES][2][64];     ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
+} H264Context;
+
+extern const uint16_t ff_h264_mb_sizes[4];
+
+/**
+ * Uninit H264 param sets structure.
+ */
+
+void ff_h264_ps_uninit(H264ParamSets *ps);
+
+/**
+ * Decode SPS
+ */
+int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
+                                     H264ParamSets *ps, int ignore_truncation);
+
+/**
+ * Decode PPS
+ */
+int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
+                                         H264ParamSets *ps, int bit_length);
+
+/**
+ * Reconstruct bitstream slice_type.
+ */
+int ff_h264_get_slice_type(const H264SliceContext *sl);
+
+/**
+ * Allocate tables.
+ * needs width/height
+ */
+int ff_h264_alloc_tables(H264Context *h);
+
+int ff_h264_decode_ref_pic_list_reordering(const H264Context *h, H264SliceContext *sl);
+int ff_h264_build_ref_list(H264Context *h, H264SliceContext *sl);
+void ff_h264_remove_all_refs(H264Context *h);
+
+/**
+ * Execute the reference picture marking (memory management control operations).
+ */
+int ff_h264_execute_ref_pic_marking(H264Context *h);
+
+int ff_h264_decode_ref_pic_marking(const H264Context *h, H264SliceContext *sl,
+                                   GetBitContext *gb);
+
+void ff_h264_hl_decode_mb(const H264Context *h, H264SliceContext *sl);
+int ff_h264_decode_init(AVCodecContext *avctx);
+void ff_h264_decode_init_vlc(void);
+
+/**
+ * Decode a macroblock
+ * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
+ */
+int ff_h264_decode_mb_cavlc(const H264Context *h, H264SliceContext *sl);
+
+/**
+ * Decode a CABAC coded macroblock
+ * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
+ */
+int ff_h264_decode_mb_cabac(const H264Context *h, H264SliceContext *sl);
+
+void ff_h264_init_cabac_states(const H264Context *h, H264SliceContext *sl);
+
+void ff_h264_direct_dist_scale_factor(const H264Context *const h, H264SliceContext *sl);
+void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl);
+void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,
+                                int *mb_type);
+
+void ff_h264_filter_mb_fast(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
+                            uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
+                            unsigned int linesize, unsigned int uvlinesize);
+void ff_h264_filter_mb(const H264Context *h, H264SliceContext *sl, int mb_x, int mb_y,
+                       uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
+                       unsigned int linesize, unsigned int uvlinesize);
+
+/*
+ * o-o o-o
+ *  / / /
+ * o-o o-o
+ *  ,---'
+ * o-o o-o
+ *  / / /
+ * o-o o-o
+ */
+
+/* Scan8 organization:
+ *    0 1 2 3 4 5 6 7
+ * 0  DY    y y y y y
+ * 1        y Y Y Y Y
+ * 2        y Y Y Y Y
+ * 3        y Y Y Y Y
+ * 4        y Y Y Y Y
+ * 5  DU    u u u u u
+ * 6        u U U U U
+ * 7        u U U U U
+ * 8        u U U U U
+ * 9        u U U U U
+ * 10 DV    v v v v v
+ * 11       v V V V V
+ * 12       v V V V V
+ * 13       v V V V V
+ * 14       v V V V V
+ * DY/DU/DV are for luma/chroma DC.
+ */
+
+#define LUMA_DC_BLOCK_INDEX   48
+#define CHROMA_DC_BLOCK_INDEX 49
+
+// This table must be here because scan8[constant] must be known at compiletime
+static const uint8_t scan8[16 * 3 + 3] = {
+    4 +  1 * 8, 5 +  1 * 8, 4 +  2 * 8, 5 +  2 * 8,
+    6 +  1 * 8, 7 +  1 * 8, 6 +  2 * 8, 7 +  2 * 8,
+    4 +  3 * 8, 5 +  3 * 8, 4 +  4 * 8, 5 +  4 * 8,
+    6 +  3 * 8, 7 +  3 * 8, 6 +  4 * 8, 7 +  4 * 8,
+    4 +  6 * 8, 5 +  6 * 8, 4 +  7 * 8, 5 +  7 * 8,
+    6 +  6 * 8, 7 +  6 * 8, 6 +  7 * 8, 7 +  7 * 8,
+    4 +  8 * 8, 5 +  8 * 8, 4 +  9 * 8, 5 +  9 * 8,
+    6 +  8 * 8, 7 +  8 * 8, 6 +  9 * 8, 7 +  9 * 8,
+    4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
+    6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
+    4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
+    6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
+    0 +  0 * 8, 0 +  5 * 8, 0 + 10 * 8
+};
+
+static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
+{
+#if HAVE_BIGENDIAN
+    return (b & 0xFFFF) + (a << 16);
+#else
+    return (a & 0xFFFF) + (b << 16);
+#endif
+}
+
+static av_always_inline uint16_t pack8to16(unsigned a, unsigned b)
+{
+#if HAVE_BIGENDIAN
+    return (b & 0xFF) + (a << 8);
+#else
+    return (a & 0xFF) + (b << 8);
+#endif
+}
+
+/**
+ * Get the chroma qp.
+ */
+static av_always_inline int get_chroma_qp(const PPS *pps, int t, int qscale)
+{
+    return pps->chroma_qp_table[t][qscale];
+}
+
+/**
+ * Get the predicted intra4x4 prediction mode.
+ */
+static av_always_inline int pred_intra_mode(const H264Context *h,
+                                            H264SliceContext *sl, int n)
+{
+    const int index8 = scan8[n];
+    const int left   = sl->intra4x4_pred_mode_cache[index8 - 1];
+    const int top    = sl->intra4x4_pred_mode_cache[index8 - 8];
+    const int min    = FFMIN(left, top);
+
+    ff_tlog(h->avctx, "mode:%d %d min:%d\n", left, top, min);
+
+    if (min < 0)
+        return DC_PRED;
+    else
+        return min;
+}
+
+static av_always_inline void write_back_intra_pred_mode(const H264Context *h,
+                                                        H264SliceContext *sl)
+{
+    int8_t *i4x4       = sl->intra4x4_pred_mode + h->mb2br_xy[sl->mb_xy];
+    int8_t *i4x4_cache = sl->intra4x4_pred_mode_cache;
+
+    AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
+    i4x4[4] = i4x4_cache[7 + 8 * 3];
+    i4x4[5] = i4x4_cache[7 + 8 * 2];
+    i4x4[6] = i4x4_cache[7 + 8 * 1];
+}
+
+static av_always_inline void write_back_non_zero_count(const H264Context *h,
+                                                       H264SliceContext *sl)
+{
+    const int mb_xy    = sl->mb_xy;
+    uint8_t *nnz       = h->non_zero_count[mb_xy];
+    uint8_t *nnz_cache = sl->non_zero_count_cache;
+
+    AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
+    AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
+    AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
+    AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
+    AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
+    AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
+    AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
+    AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
+
+    if (!h->chroma_y_shift) {
+        AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
+        AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
+        AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
+        AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
+    }
+}
+
+static av_always_inline void write_back_motion_list(const H264Context *h,
+                                                    H264SliceContext *sl,
+                                                    int b_stride,
+                                                    int b_xy, int b8_xy,
+                                                    int mb_type, int list)
+{
+    int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
+    int16_t(*mv_src)[2] = &sl->mv_cache[list][scan8[0]];
+    AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
+    AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
+    AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
+    AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
+    if (CABAC(h)) {
+        uint8_t (*mvd_dst)[2] = &sl->mvd_table[list][FMO ? 8 * sl->mb_xy
+                                                        : h->mb2br_xy[sl->mb_xy]];
+        uint8_t(*mvd_src)[2]  = &sl->mvd_cache[list][scan8[0]];
+        if (IS_SKIP(mb_type)) {
+            AV_ZERO128(mvd_dst);
+        } else {
+            AV_COPY64(mvd_dst, mvd_src + 8 * 3);
+            AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
+            AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
+            AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
+        }
+    }
+
+    {
+        int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
+        int8_t *ref_cache = sl->ref_cache[list];
+        ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
+        ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
+        ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
+        ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
+    }
+}
+
+static av_always_inline void write_back_motion(const H264Context *h,
+                                               H264SliceContext *sl,
+                                               int mb_type)
+{
+    const int b_stride      = h->b_stride;
+    const int b_xy  = 4 * sl->mb_x + 4 * sl->mb_y * h->b_stride; // try mb2b(8)_xy
+    const int b8_xy = 4 * sl->mb_xy;
+
+    if (USES_LIST(mb_type, 0)) {
+        write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 0);
+    } else {
+        fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
+                       2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
+    }
+    if (USES_LIST(mb_type, 1))
+        write_back_motion_list(h, sl, b_stride, b_xy, b8_xy, mb_type, 1);
+
+    if (sl->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
+        if (IS_8X8(mb_type)) {
+            uint8_t *direct_table = &h->direct_table[4 * sl->mb_xy];
+            direct_table[1] = sl->sub_mb_type[1] >> 1;
+            direct_table[2] = sl->sub_mb_type[2] >> 1;
+            direct_table[3] = sl->sub_mb_type[3] >> 1;
+        }
+    }
+}
+
+static av_always_inline int get_dct8x8_allowed(const H264Context *h, H264SliceContext *sl)
+{
+    if (h->ps.sps->direct_8x8_inference_flag)
+        return !(AV_RN64A(sl->sub_mb_type) &
+                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
+                  0x0001000100010001ULL));
+    else
+        return !(AV_RN64A(sl->sub_mb_type) &
+                 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
+                  0x0001000100010001ULL));
+}
+
+static inline int find_start_code(const uint8_t *buf, int buf_size,
+                           int buf_index, int next_avc)
+{
+    uint32_t state = -1;
+
+    buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
+
+    return FFMIN(buf_index, buf_size);
+}
+
+int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup);
+
+int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
+void ff_h264_unref_picture(H264Context *h, H264Picture *pic);
+
+int ff_h264_slice_context_init(H264Context *h, H264SliceContext *sl);
+
+void ff_h264_draw_horiz_band(const H264Context *h, H264SliceContext *sl, int y, int height);
+
+int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl,
+                                const H2645NAL *nal);
+#define SLICE_SINGLETHREAD 1
+#define SLICE_SKIPED 2
+
+int ff_h264_execute_decode_slices(H264Context *h, unsigned context_count);
+int ff_h264_update_thread_context(AVCodecContext *dst,
+                                  const AVCodecContext *src);
+
+void ff_h264_flush_change(H264Context *h);
+
+void ff_h264_free_tables(H264Context *h);
+
+void ff_h264_set_erpic(ERPicture *dst, H264Picture *src);
+
+#endif /* AVCODEC_H264DEC_H */