/* * FFV1 codec for libavcodec * * Copyright (c) 2003-2012 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_FFV1_H #define AVCODEC_FFV1_H /** * @file * FF Video Codec 1 (a lossless codec) */ #include "libavutil/avassert.h" #include "libavutil/crc.h" #include "libavutil/opt.h" #include "libavutil/imgutils.h" #include "libavutil/pixdesc.h" #include "libavutil/timer.h" #include "avcodec.h" #include "dsputil.h" #include "get_bits.h" #include "internal.h" #include "mathops.h" #include "put_bits.h" #include "rangecoder.h" #ifdef __INTEL_COMPILER #undef av_flatten #define av_flatten #endif #define MAX_PLANES 4 #define CONTEXT_SIZE 32 #define MAX_QUANT_TABLES 8 #define MAX_CONTEXT_INPUTS 5 extern const uint8_t ff_log2_run[41]; typedef struct VlcState { int16_t drift; uint16_t error_sum; int8_t bias; uint8_t count; } VlcState; typedef struct PlaneContext { int16_t quant_table[MAX_CONTEXT_INPUTS][256]; int quant_table_index; int context_count; uint8_t (*state)[CONTEXT_SIZE]; VlcState *vlc_state; uint8_t interlace_bit_state[2]; } PlaneContext; #define MAX_SLICES 256 typedef struct FFV1Context { AVClass *class; AVCodecContext *avctx; RangeCoder c; GetBitContext gb; PutBitContext pb; uint64_t rc_stat[256][2]; uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2]; int version; int minor_version; int width, height; int chroma_planes; int chroma_h_shift, chroma_v_shift; int transparency; int flags; int picture_number; AVFrame picture; AVFrame last_picture; int plane_count; int ac; ///< 1=range coder <-> 0=golomb rice int ac_byte_count; ///< number of bytes used for AC coding PlaneContext plane[MAX_PLANES]; int16_t quant_table[MAX_CONTEXT_INPUTS][256]; int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256]; int context_count[MAX_QUANT_TABLES]; uint8_t state_transition[256]; uint8_t (*initial_states[MAX_QUANT_TABLES])[32]; int run_index; int colorspace; int16_t *sample_buffer; int ec; int slice_damaged; int key_frame_ok; int bits_per_raw_sample; int packed_at_lsb; int gob_count; int quant_table_count; DSPContext dsp; struct FFV1Context *slice_context[MAX_SLICES]; int slice_count; int num_v_slices; int num_h_slices; int slice_width; int slice_height; int slice_x; int slice_y; } FFV1Context; int ffv1_common_init(AVCodecContext *avctx); int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs); int ffv1_init_slices_state(FFV1Context *f); int ffv1_init_slice_contexts(FFV1Context *f); int ffv1_allocate_initial_states(FFV1Context *f); void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs); int ffv1_close(AVCodecContext *avctx); static av_always_inline int fold(int diff, int bits) { if (bits == 8) diff = (int8_t)diff; else { diff += 1 << (bits - 1); diff &= (1 << bits) - 1; diff -= 1 << (bits - 1); } return diff; } static inline int predict(int16_t *src, int16_t *last) { const int LT = last[-1]; const int T = last[0]; const int L = src[-1]; return mid_pred(L, L + T - LT, T); } static inline int get_context(PlaneContext *p, int16_t *src, int16_t *last, int16_t *last2) { const int LT = last[-1]; const int T = last[0]; const int RT = last[1]; const int L = src[-1]; if (p->quant_table[3][127]) { const int TT = last2[0]; const int LL = src[-2]; return p->quant_table[0][(L - LT) & 0xFF] + p->quant_table[1][(LT - T) & 0xFF] + p->quant_table[2][(T - RT) & 0xFF] + p->quant_table[3][(LL - L) & 0xFF] + p->quant_table[4][(TT - T) & 0xFF]; } else return p->quant_table[0][(L - LT) & 0xFF] + p->quant_table[1][(LT - T) & 0xFF] + p->quant_table[2][(T - RT) & 0xFF]; } static inline void update_vlc_state(VlcState *const state, const int v) { int drift = state->drift; int count = state->count; state->error_sum += FFABS(v); drift += v; if (count == 128) { // FIXME: variable count >>= 1; drift >>= 1; state->error_sum >>= 1; } count++; if (drift <= -count) { if (state->bias > -128) state->bias--; drift += count; if (drift <= -count) drift = -count + 1; } else if (drift > 0) { if (state->bias < 127) state->bias++; drift -= count; if (drift > 0) drift = 0; } state->drift = drift; state->count = count; } #endif /* AVCODEC_FFV1_H */