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Diffstat (limited to 'media/ffvpx/libavcodec/vp56.h')
| -rw-r--r-- | media/ffvpx/libavcodec/vp56.h | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/vp56.h b/media/ffvpx/libavcodec/vp56.h new file mode 100644 index 000000000..56c30919b --- /dev/null +++ b/media/ffvpx/libavcodec/vp56.h @@ -0,0 +1,400 @@ +/* + * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org> + * + * 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 + * VP5 and VP6 compatible video decoder (common features) + */ + +#ifndef AVCODEC_VP56_H +#define AVCODEC_VP56_H + +#include "get_bits.h" +#include "hpeldsp.h" +#include "bytestream.h" +#include "h264chroma.h" +#include "videodsp.h" +#include "vp3dsp.h" +#include "vp56dsp.h" + +typedef struct vp56_context VP56Context; + +typedef enum { + VP56_FRAME_NONE =-1, + VP56_FRAME_CURRENT = 0, + VP56_FRAME_PREVIOUS = 1, + VP56_FRAME_GOLDEN = 2, + VP56_FRAME_GOLDEN2 = 3, +} VP56Frame; + +typedef enum { + VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */ + VP56_MB_INTRA = 1, /**< Intra MB */ + VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */ + VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */ + VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */ + VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */ + VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */ + VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */ + VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */ + VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */ +} VP56mb; + +typedef struct VP56Tree { + int8_t val; + int8_t prob_idx; +} VP56Tree; + +typedef struct VP56mv { + DECLARE_ALIGNED(4, int16_t, x); + int16_t y; +} VP56mv; + +#define VP56_SIZE_CHANGE 1 + +typedef void (*VP56ParseVectorAdjustment)(VP56Context *s, + VP56mv *vect); +typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src, + int offset1, int offset2, int stride, + VP56mv mv, int mask, int select, int luma); +typedef void (*VP56ParseCoeff)(VP56Context *s); +typedef void (*VP56DefaultModelsInit)(VP56Context *s); +typedef void (*VP56ParseVectorModels)(VP56Context *s); +typedef int (*VP56ParseCoeffModels)(VP56Context *s); +typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf, + int buf_size); + +typedef struct VP56RangeCoder { + int high; + int bits; /* stored negated (i.e. negative "bits" is a positive number of + bits left) in order to eliminate a negate in cache refilling */ + const uint8_t *buffer; + const uint8_t *end; + unsigned int code_word; +} VP56RangeCoder; + +typedef struct VP56RefDc { + uint8_t not_null_dc; + VP56Frame ref_frame; + int16_t dc_coeff; +} VP56RefDc; + +typedef struct VP56Macroblock { + uint8_t type; + VP56mv mv; +} VP56Macroblock; + +typedef struct VP56Model { + uint8_t coeff_reorder[64]; /* used in vp6 only */ + uint8_t coeff_index_to_pos[64]; /* used in vp6 only */ + uint8_t vector_sig[2]; /* delta sign */ + uint8_t vector_dct[2]; /* delta coding types */ + uint8_t vector_pdi[2][2]; /* predefined delta init */ + uint8_t vector_pdv[2][7]; /* predefined delta values */ + uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */ + uint8_t coeff_dccv[2][11]; /* DC coeff value */ + uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */ + uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */ + uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */ + uint8_t coeff_runv[2][14]; /* run value (vp6 only) */ + uint8_t mb_type[3][10][10]; /* model for decoding MB type */ + uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */ +} VP56Model; + +struct vp56_context { + AVCodecContext *avctx; + H264ChromaContext h264chroma; + HpelDSPContext hdsp; + VideoDSPContext vdsp; + VP3DSPContext vp3dsp; + VP56DSPContext vp56dsp; + uint8_t idct_scantable[64]; + AVFrame *frames[4]; + uint8_t *edge_emu_buffer_alloc; + uint8_t *edge_emu_buffer; + VP56RangeCoder c; + VP56RangeCoder cc; + VP56RangeCoder *ccp; + int sub_version; + + /* frame info */ + int golden_frame; + int plane_width[4]; + int plane_height[4]; + int mb_width; /* number of horizontal MB */ + int mb_height; /* number of vertical MB */ + int block_offset[6]; + + int quantizer; + uint16_t dequant_dc; + uint16_t dequant_ac; + + /* DC predictors management */ + VP56RefDc *above_blocks; + VP56RefDc left_block[4]; + int above_block_idx[6]; + int16_t prev_dc[3][3]; /* [plan][ref_frame] */ + + /* blocks / macroblock */ + VP56mb mb_type; + VP56Macroblock *macroblocks; + DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64]; + + /* motion vectors */ + VP56mv mv[6]; /* vectors for each block in MB */ + VP56mv vector_candidate[2]; + int vector_candidate_pos; + + /* filtering hints */ + int filter_header; /* used in vp6 only */ + int deblock_filtering; + int filter_selection; + int filter_mode; + int max_vector_length; + int sample_variance_threshold; + + uint8_t coeff_ctx[4][64]; /* used in vp5 only */ + uint8_t coeff_ctx_last[4]; /* used in vp5 only */ + + int has_alpha; + + /* upside-down flipping hints */ + int flip; /* are we flipping ? */ + int frbi; /* first row block index in MB */ + int srbi; /* second row block index in MB */ + int stride[4]; /* stride for each plan */ + + const uint8_t *vp56_coord_div; + VP56ParseVectorAdjustment parse_vector_adjustment; + VP56Filter filter; + VP56ParseCoeff parse_coeff; + VP56DefaultModelsInit default_models_init; + VP56ParseVectorModels parse_vector_models; + VP56ParseCoeffModels parse_coeff_models; + VP56ParseHeader parse_header; + + /* for "slice" parallelism between YUV and A */ + VP56Context *alpha_context; + + VP56Model *modelp; + VP56Model model; + + /* huffman decoding */ + int use_huffman; + GetBitContext gb; + VLC dccv_vlc[2]; + VLC runv_vlc[2]; + VLC ract_vlc[2][3][6]; + unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */ +}; + + +int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha); +int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, + int flip, int has_alpha); +int ff_vp56_free(AVCodecContext *avctx); +int ff_vp56_free_context(VP56Context *s); +void ff_vp56_init_dequant(VP56Context *s, int quantizer); +int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, + AVPacket *avpkt); + + +/** + * vp56 specific range coder implementation + */ + +extern const uint8_t ff_vp56_norm_shift[256]; +void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size); + +static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c) +{ + int shift = ff_vp56_norm_shift[c->high]; + int bits = c->bits; + unsigned int code_word = c->code_word; + + c->high <<= shift; + code_word <<= shift; + bits += shift; + if(bits >= 0 && c->buffer < c->end) { + code_word |= bytestream_get_be16(&c->buffer) << bits; + bits -= 16; + } + c->bits = bits; + return code_word; +} + +#if ARCH_ARM +#include "arm/vp56_arith.h" +#elif ARCH_X86 +#include "x86/vp56_arith.h" +#endif + +#ifndef vp56_rac_get_prob +#define vp56_rac_get_prob vp56_rac_get_prob +static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob) +{ + unsigned int code_word = vp56_rac_renorm(c); + unsigned int low = 1 + (((c->high - 1) * prob) >> 8); + unsigned int low_shift = low << 16; + int bit = code_word >= low_shift; + + c->high = bit ? c->high - low : low; + c->code_word = bit ? code_word - low_shift : code_word; + + return bit; +} +#endif + +#ifndef vp56_rac_get_prob_branchy +// branchy variant, to be used where there's a branch based on the bit decoded +static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob) +{ + unsigned long code_word = vp56_rac_renorm(c); + unsigned low = 1 + (((c->high - 1) * prob) >> 8); + unsigned low_shift = low << 16; + + if (code_word >= low_shift) { + c->high -= low; + c->code_word = code_word - low_shift; + return 1; + } + + c->high = low; + c->code_word = code_word; + return 0; +} +#endif + +static av_always_inline int vp56_rac_get(VP56RangeCoder *c) +{ + unsigned int code_word = vp56_rac_renorm(c); + /* equiprobable */ + int low = (c->high + 1) >> 1; + unsigned int low_shift = low << 16; + int bit = code_word >= low_shift; + if (bit) { + c->high -= low; + code_word -= low_shift; + } else { + c->high = low; + } + + c->code_word = code_word; + return bit; +} + +// rounding is different than vp56_rac_get, is vp56_rac_get wrong? +static av_always_inline int vp8_rac_get(VP56RangeCoder *c) +{ + return vp56_rac_get_prob(c, 128); +} + +static int vp56_rac_gets(VP56RangeCoder *c, int bits) +{ + int value = 0; + + while (bits--) { + value = (value << 1) | vp56_rac_get(c); + } + + return value; +} + +static int vp8_rac_get_uint(VP56RangeCoder *c, int bits) +{ + int value = 0; + + while (bits--) { + value = (value << 1) | vp8_rac_get(c); + } + + return value; +} + +// fixme: add 1 bit to all the calls to this? +static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits) +{ + int v; + + if (!vp8_rac_get(c)) + return 0; + + v = vp8_rac_get_uint(c, bits); + + if (vp8_rac_get(c)) + v = -v; + + return v; +} + +// P(7) +static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits) +{ + int v = vp56_rac_gets(c, 7) << 1; + return v + !v; +} + +static av_unused int vp8_rac_get_nn(VP56RangeCoder *c) +{ + int v = vp8_rac_get_uint(c, 7) << 1; + return v + !v; +} + +static av_always_inline +int vp56_rac_get_tree(VP56RangeCoder *c, + const VP56Tree *tree, + const uint8_t *probs) +{ + while (tree->val > 0) { + if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx])) + tree += tree->val; + else + tree++; + } + return -tree->val; +} + +// how probabilities are associated with decisions is different I think +// well, the new scheme fits in the old but this way has one fewer branches per decision +static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2], + const uint8_t *probs) +{ + int i = 0; + + do { + i = tree[i][vp56_rac_get_prob(c, probs[i])]; + } while (i > 0); + + return -i; +} + +// DCTextra +static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob) +{ + int v = 0; + + do { + v = (v<<1) + vp56_rac_get_prob(c, *prob++); + } while (*prob); + + return v; +} + +#endif /* AVCODEC_VP56_H */ |