yading@10: /*
yading@10:  * FFV1 codec for libavcodec
yading@10:  *
yading@10:  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_FFV1_H
yading@10: #define AVCODEC_FFV1_H
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * FF Video Codec 1 (a lossless codec)
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/crc.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/timer.h"
yading@10: #include "avcodec.h"
yading@10: #include "dsputil.h"
yading@10: #include "get_bits.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: #include "put_bits.h"
yading@10: #include "rangecoder.h"
yading@10: 
yading@10: #ifdef __INTEL_COMPILER
yading@10: #undef av_flatten
yading@10: #define av_flatten
yading@10: #endif
yading@10: 
yading@10: #define MAX_PLANES 4
yading@10: #define CONTEXT_SIZE 32
yading@10: 
yading@10: #define MAX_QUANT_TABLES 8
yading@10: #define MAX_CONTEXT_INPUTS 5
yading@10: 
yading@10: extern const uint8_t ff_log2_run[41];
yading@10: 
yading@10: typedef struct VlcState {
yading@10:     int16_t drift;
yading@10:     uint16_t error_sum;
yading@10:     int8_t bias;
yading@10:     uint8_t count;
yading@10: } VlcState;
yading@10: 
yading@10: typedef struct PlaneContext {
yading@10:     int16_t quant_table[MAX_CONTEXT_INPUTS][256];
yading@10:     int quant_table_index;
yading@10:     int context_count;
yading@10:     uint8_t (*state)[CONTEXT_SIZE];
yading@10:     VlcState *vlc_state;
yading@10:     uint8_t interlace_bit_state[2];
yading@10: } PlaneContext;
yading@10: 
yading@10: #define MAX_SLICES 256
yading@10: 
yading@10: typedef struct FFV1Context {
yading@10:     AVClass *class;
yading@10:     AVCodecContext *avctx;
yading@10:     RangeCoder c;
yading@10:     GetBitContext gb;
yading@10:     PutBitContext pb;
yading@10:     uint64_t rc_stat[256][2];
yading@10:     uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
yading@10:     int version;
yading@10:     int minor_version;
yading@10:     int width, height;
yading@10:     int chroma_planes;
yading@10:     int chroma_h_shift, chroma_v_shift;
yading@10:     int transparency;
yading@10:     int flags;
yading@10:     int picture_number;
yading@10:     AVFrame picture, last_picture;
yading@10: 
yading@10:     AVFrame *cur;
yading@10:     int plane_count;
yading@10:     int ac;                              ///< 1=range coder <-> 0=golomb rice
yading@10:     int ac_byte_count;                   ///< number of bytes used for AC coding
yading@10:     PlaneContext plane[MAX_PLANES];
yading@10:     int16_t quant_table[MAX_CONTEXT_INPUTS][256];
yading@10:     int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
yading@10:     int context_count[MAX_QUANT_TABLES];
yading@10:     uint8_t state_transition[256];
yading@10:     uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
yading@10:     int run_index;
yading@10:     int colorspace;
yading@10:     int16_t *sample_buffer;
yading@10: 
yading@10:     int ec;
yading@10:     int slice_damaged;
yading@10:     int key_frame_ok;
yading@10: 
yading@10:     int bits_per_raw_sample;
yading@10:     int packed_at_lsb;
yading@10: 
yading@10:     int gob_count;
yading@10:     int quant_table_count;
yading@10: 
yading@10:     DSPContext dsp;
yading@10: 
yading@10:     struct FFV1Context *slice_context[MAX_SLICES];
yading@10:     int slice_count;
yading@10:     int num_v_slices;
yading@10:     int num_h_slices;
yading@10:     int slice_width;
yading@10:     int slice_height;
yading@10:     int slice_x;
yading@10:     int slice_y;
yading@10: } FFV1Context;
yading@10: 
yading@10: int ffv1_common_init(AVCodecContext *avctx);
yading@10: int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
yading@10: int ffv1_init_slices_state(FFV1Context *f);
yading@10: int ffv1_init_slice_contexts(FFV1Context *f);
yading@10: int ffv1_allocate_initial_states(FFV1Context *f);
yading@10: void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
yading@10: int ffv1_close(AVCodecContext *avctx);
yading@10: 
yading@10: static av_always_inline int fold(int diff, int bits)
yading@10: {
yading@10:     if (bits == 8)
yading@10:         diff = (int8_t)diff;
yading@10:     else {
yading@10:         diff +=  1 << (bits  - 1);
yading@10:         diff &= (1 <<  bits) - 1;
yading@10:         diff -=  1 << (bits  - 1);
yading@10:     }
yading@10: 
yading@10:     return diff;
yading@10: }
yading@10: 
yading@10: static inline int predict(int16_t *src, int16_t *last)
yading@10: {
yading@10:     const int LT = last[-1];
yading@10:     const int T  = last[0];
yading@10:     const int L  = src[-1];
yading@10: 
yading@10:     return mid_pred(L, L + T - LT, T);
yading@10: }
yading@10: 
yading@10: static inline int get_context(PlaneContext *p, int16_t *src,
yading@10:                               int16_t *last, int16_t *last2)
yading@10: {
yading@10:     const int LT = last[-1];
yading@10:     const int T  = last[0];
yading@10:     const int RT = last[1];
yading@10:     const int L  = src[-1];
yading@10: 
yading@10:     if (p->quant_table[3][127]) {
yading@10:         const int TT = last2[0];
yading@10:         const int LL = src[-2];
yading@10:         return p->quant_table[0][(L - LT) & 0xFF] +
yading@10:                p->quant_table[1][(LT - T) & 0xFF] +
yading@10:                p->quant_table[2][(T - RT) & 0xFF] +
yading@10:                p->quant_table[3][(LL - L) & 0xFF] +
yading@10:                p->quant_table[4][(TT - T) & 0xFF];
yading@10:     } else
yading@10:         return p->quant_table[0][(L - LT) & 0xFF] +
yading@10:                p->quant_table[1][(LT - T) & 0xFF] +
yading@10:                p->quant_table[2][(T - RT) & 0xFF];
yading@10: }
yading@10: 
yading@10: static inline void update_vlc_state(VlcState *const state, const int v)
yading@10: {
yading@10:     int drift = state->drift;
yading@10:     int count = state->count;
yading@10:     state->error_sum += FFABS(v);
yading@10:     drift            += v;
yading@10: 
yading@10:     if (count == 128) { // FIXME: variable
yading@10:         count            >>= 1;
yading@10:         drift            >>= 1;
yading@10:         state->error_sum >>= 1;
yading@10:     }
yading@10:     count++;
yading@10: 
yading@10:     if (drift <= -count) {
yading@10:         if (state->bias > -128)
yading@10:             state->bias--;
yading@10: 
yading@10:         drift += count;
yading@10:         if (drift <= -count)
yading@10:             drift = -count + 1;
yading@10:     } else if (drift > 0) {
yading@10:         if (state->bias < 127)
yading@10:             state->bias++;
yading@10: 
yading@10:         drift -= count;
yading@10:         if (drift > 0)
yading@10:             drift = 0;
yading@10:     }
yading@10: 
yading@10:     state->drift = drift;
yading@10:     state->count = count;
yading@10: }
yading@10: 
yading@10: #endif /* AVCODEC_FFV1_H */